code time

.gitignore

@@ -4,4 +4,8 @@
 *.pyc
 .DS_Store
 credentials.json
-venv/
+venv/
+.vscode/
+__pycache__/
+*.pyo
+*.pyc

lib/protobuf/__init__.py

@@ -0,0 +1,33 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# Copyright 2007 Google Inc. All Rights Reserved.
+
+__version__ = '3.20.1'

lib/protobuf/any_pb2.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/any.proto
+"""Generated protocol buffer code."""
+from google.protobuf.internal import builder as _builder
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import descriptor_pool as _descriptor_pool
+from google.protobuf import symbol_database as _symbol_database
+# @@protoc_insertion_point(imports)
+
+_sym_db = _symbol_database.Default()
+
+
+
+
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x19google/protobuf/any.proto\x12\x0fgoogle.protobuf\"&\n\x03\x41ny\x12\x10\n\x08type_url\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\x0c\x42v\n\x13\x63om.google.protobufB\x08\x41nyProtoP\x01Z,google.golang.org/protobuf/types/known/anypb\xa2\x02\x03GPB\xaa\x02\x1eGoogle.Protobuf.WellKnownTypesb\x06proto3')
+
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'google.protobuf.any_pb2', globals())
+if _descriptor._USE_C_DESCRIPTORS == False:
+
+  DESCRIPTOR._options = None
+  DESCRIPTOR._serialized_options = b'\n\023com.google.protobufB\010AnyProtoP\001Z,google.golang.org/protobuf/types/known/anypb\242\002\003GPB\252\002\036Google.Protobuf.WellKnownTypes'
+  _ANY._serialized_start=46
+  _ANY._serialized_end=84
+# @@protoc_insertion_point(module_scope)

lib/protobuf/api_pb2.py

@@ -0,0 +1,32 @@
+# -*- coding: utf-8 -*-
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/api.proto
+"""Generated protocol buffer code."""
+from google.protobuf.internal import builder as _builder
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import descriptor_pool as _descriptor_pool
+from google.protobuf import symbol_database as _symbol_database
+# @@protoc_insertion_point(imports)
+
+_sym_db = _symbol_database.Default()
+
+
+from google.protobuf import source_context_pb2 as google_dot_protobuf_dot_source__context__pb2
+from google.protobuf import type_pb2 as google_dot_protobuf_dot_type__pb2
+
+
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x19google/protobuf/api.proto\x12\x0fgoogle.protobuf\x1a$google/protobuf/source_context.proto\x1a\x1agoogle/protobuf/type.proto\"\x81\x02\n\x03\x41pi\x12\x0c\n\x04name\x18\x01 \x01(\t\x12(\n\x07methods\x18\x02 \x03(\x0b\x32\x17.google.protobuf.Method\x12(\n\x07options\x18\x03 \x03(\x0b\x32\x17.google.protobuf.Option\x12\x0f\n\x07version\x18\x04 \x01(\t\x12\x36\n\x0esource_context\x18\x05 \x01(\x0b\x32\x1e.google.protobuf.SourceContext\x12&\n\x06mixins\x18\x06 \x03(\x0b\x32\x16.google.protobuf.Mixin\x12\'\n\x06syntax\x18\x07 \x01(\x0e\x32\x17.google.protobuf.Syntax\"\xd5\x01\n\x06Method\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\x18\n\x10request_type_url\x18\x02 \x01(\t\x12\x19\n\x11request_streaming\x18\x03 \x01(\x08\x12\x19\n\x11response_type_url\x18\x04 \x01(\t\x12\x1a\n\x12response_streaming\x18\x05 \x01(\x08\x12(\n\x07options\x18\x06 \x03(\x0b\x32\x17.google.protobuf.Option\x12\'\n\x06syntax\x18\x07 \x01(\x0e\x32\x17.google.protobuf.Syntax\"#\n\x05Mixin\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\x0c\n\x04root\x18\x02 \x01(\tBv\n\x13\x63om.google.protobufB\x08\x41piProtoP\x01Z,google.golang.org/protobuf/types/known/apipb\xa2\x02\x03GPB\xaa\x02\x1eGoogle.Protobuf.WellKnownTypesb\x06proto3')
+
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'google.protobuf.api_pb2', globals())
+if _descriptor._USE_C_DESCRIPTORS == False:
+
+  DESCRIPTOR._options = None
+  DESCRIPTOR._serialized_options = b'\n\023com.google.protobufB\010ApiProtoP\001Z,google.golang.org/protobuf/types/known/apipb\242\002\003GPB\252\002\036Google.Protobuf.WellKnownTypes'
+  _API._serialized_start=113
+  _API._serialized_end=370
+  _METHOD._serialized_start=373
+  _METHOD._serialized_end=586
+  _MIXIN._serialized_start=588
+  _MIXIN._serialized_end=623
+# @@protoc_insertion_point(module_scope)

lib/protobuf/compiler/plugin_pb2.py

@@ -0,0 +1,35 @@
+# -*- coding: utf-8 -*-
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/compiler/plugin.proto
+"""Generated protocol buffer code."""
+from google.protobuf.internal import builder as _builder
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import descriptor_pool as _descriptor_pool
+from google.protobuf import symbol_database as _symbol_database
+# @@protoc_insertion_point(imports)
+
+_sym_db = _symbol_database.Default()
+
+
+from google.protobuf import descriptor_pb2 as google_dot_protobuf_dot_descriptor__pb2
+
+
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n%google/protobuf/compiler/plugin.proto\x12\x18google.protobuf.compiler\x1a google/protobuf/descriptor.proto\"F\n\x07Version\x12\r\n\x05major\x18\x01 \x01(\x05\x12\r\n\x05minor\x18\x02 \x01(\x05\x12\r\n\x05patch\x18\x03 \x01(\x05\x12\x0e\n\x06suffix\x18\x04 \x01(\t\"\xba\x01\n\x14\x43odeGeneratorRequest\x12\x18\n\x10\x66ile_to_generate\x18\x01 \x03(\t\x12\x11\n\tparameter\x18\x02 \x01(\t\x12\x38\n\nproto_file\x18\x0f \x03(\x0b\x32$.google.protobuf.FileDescriptorProto\x12;\n\x10\x63ompiler_version\x18\x03 \x01(\x0b\x32!.google.protobuf.compiler.Version\"\xc1\x02\n\x15\x43odeGeneratorResponse\x12\r\n\x05\x65rror\x18\x01 \x01(\t\x12\x1a\n\x12supported_features\x18\x02 \x01(\x04\x12\x42\n\x04\x66ile\x18\x0f \x03(\x0b\x32\x34.google.protobuf.compiler.CodeGeneratorResponse.File\x1a\x7f\n\x04\x46ile\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\x17\n\x0finsertion_point\x18\x02 \x01(\t\x12\x0f\n\x07\x63ontent\x18\x0f \x01(\t\x12?\n\x13generated_code_info\x18\x10 \x01(\x0b\x32\".google.protobuf.GeneratedCodeInfo\"8\n\x07\x46\x65\x61ture\x12\x10\n\x0c\x46\x45\x41TURE_NONE\x10\x00\x12\x1b\n\x17\x46\x45\x41TURE_PROTO3_OPTIONAL\x10\x01\x42W\n\x1c\x63om.google.protobuf.compilerB\x0cPluginProtosZ)google.golang.org/protobuf/types/pluginpb')
+
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'google.protobuf.compiler.plugin_pb2', globals())
+if _descriptor._USE_C_DESCRIPTORS == False:
+
+  DESCRIPTOR._options = None
+  DESCRIPTOR._serialized_options = b'\n\034com.google.protobuf.compilerB\014PluginProtosZ)google.golang.org/protobuf/types/pluginpb'
+  _VERSION._serialized_start=101
+  _VERSION._serialized_end=171
+  _CODEGENERATORREQUEST._serialized_start=174
+  _CODEGENERATORREQUEST._serialized_end=360
+  _CODEGENERATORRESPONSE._serialized_start=363
+  _CODEGENERATORRESPONSE._serialized_end=684
+  _CODEGENERATORRESPONSE_FILE._serialized_start=499
+  _CODEGENERATORRESPONSE_FILE._serialized_end=626
+  _CODEGENERATORRESPONSE_FEATURE._serialized_start=628
+  _CODEGENERATORRESPONSE_FEATURE._serialized_end=684
+# @@protoc_insertion_point(module_scope)

lib/protobuf/descriptor_database.py

@@ -0,0 +1,177 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Provides a container for DescriptorProtos."""
+
+__author__ = 'matthewtoia@google.com (Matt Toia)'
+
+import warnings
+
+
+class Error(Exception):
+  pass
+
+
+class DescriptorDatabaseConflictingDefinitionError(Error):
+  """Raised when a proto is added with the same name & different descriptor."""
+
+
+class DescriptorDatabase(object):
+  """A container accepting FileDescriptorProtos and maps DescriptorProtos."""
+
+  def __init__(self):
+    self._file_desc_protos_by_file = {}
+    self._file_desc_protos_by_symbol = {}
+
+  def Add(self, file_desc_proto):
+    """Adds the FileDescriptorProto and its types to this database.
+
+    Args:
+      file_desc_proto: The FileDescriptorProto to add.
+    Raises:
+      DescriptorDatabaseConflictingDefinitionError: if an attempt is made to
+        add a proto with the same name but different definition than an
+        existing proto in the database.
+    """
+    proto_name = file_desc_proto.name
+    if proto_name not in self._file_desc_protos_by_file:
+      self._file_desc_protos_by_file[proto_name] = file_desc_proto
+    elif self._file_desc_protos_by_file[proto_name] != file_desc_proto:
+      raise DescriptorDatabaseConflictingDefinitionError(
+          '%s already added, but with different descriptor.' % proto_name)
+    else:
+      return
+
+    # Add all the top-level descriptors to the index.
+    package = file_desc_proto.package
+    for message in file_desc_proto.message_type:
+      for name in _ExtractSymbols(message, package):
+        self._AddSymbol(name, file_desc_proto)
+    for enum in file_desc_proto.enum_type:
+      self._AddSymbol(('.'.join((package, enum.name))), file_desc_proto)
+      for enum_value in enum.value:
+        self._file_desc_protos_by_symbol[
+            '.'.join((package, enum_value.name))] = file_desc_proto
+    for extension in file_desc_proto.extension:
+      self._AddSymbol(('.'.join((package, extension.name))), file_desc_proto)
+    for service in file_desc_proto.service:
+      self._AddSymbol(('.'.join((package, service.name))), file_desc_proto)
+
+  def FindFileByName(self, name):
+    """Finds the file descriptor proto by file name.
+
+    Typically the file name is a relative path ending to a .proto file. The
+    proto with the given name will have to have been added to this database
+    using the Add method or else an error will be raised.
+
+    Args:
+      name: The file name to find.
+
+    Returns:
+      The file descriptor proto matching the name.
+
+    Raises:
+      KeyError if no file by the given name was added.
+    """
+
+    return self._file_desc_protos_by_file[name]
+
+  def FindFileContainingSymbol(self, symbol):
+    """Finds the file descriptor proto containing the specified symbol.
+
+    The symbol should be a fully qualified name including the file descriptor's
+    package and any containing messages. Some examples:
+
+    'some.package.name.Message'
+    'some.package.name.Message.NestedEnum'
+    'some.package.name.Message.some_field'
+
+    The file descriptor proto containing the specified symbol must be added to
+    this database using the Add method or else an error will be raised.
+
+    Args:
+      symbol: The fully qualified symbol name.
+
+    Returns:
+      The file descriptor proto containing the symbol.
+
+    Raises:
+      KeyError if no file contains the specified symbol.
+    """
+    try:
+      return self._file_desc_protos_by_symbol[symbol]
+    except KeyError:
+      # Fields, enum values, and nested extensions are not in
+      # _file_desc_protos_by_symbol. Try to find the top level
+      # descriptor. Non-existent nested symbol under a valid top level
+      # descriptor can also be found. The behavior is the same with
+      # protobuf C++.
+      top_level, _, _ = symbol.rpartition('.')
+      try:
+        return self._file_desc_protos_by_symbol[top_level]
+      except KeyError:
+        # Raise the original symbol as a KeyError for better diagnostics.
+        raise KeyError(symbol)
+
+  def FindFileContainingExtension(self, extendee_name, extension_number):
+    # TODO(jieluo): implement this API.
+    return None
+
+  def FindAllExtensionNumbers(self, extendee_name):
+    # TODO(jieluo): implement this API.
+    return []
+
+  def _AddSymbol(self, name, file_desc_proto):
+    if name in self._file_desc_protos_by_symbol:
+      warn_msg = ('Conflict register for file "' + file_desc_proto.name +
+                  '": ' + name +
+                  ' is already defined in file "' +
+                  self._file_desc_protos_by_symbol[name].name + '"')
+      warnings.warn(warn_msg, RuntimeWarning)
+    self._file_desc_protos_by_symbol[name] = file_desc_proto
+
+
+def _ExtractSymbols(desc_proto, package):
+  """Pulls out all the symbols from a descriptor proto.
+
+  Args:
+    desc_proto: The proto to extract symbols from.
+    package: The package containing the descriptor type.
+
+  Yields:
+    The fully qualified name found in the descriptor.
+  """
+  message_name = package + '.' + desc_proto.name if package else desc_proto.name
+  yield message_name
+  for nested_type in desc_proto.nested_type:
+    for symbol in _ExtractSymbols(nested_type, message_name):
+      yield symbol
+  for enum_type in desc_proto.enum_type:
+    yield '.'.join((message_name, enum_type.name))

lib/protobuf/duration_pb2.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/duration.proto
+"""Generated protocol buffer code."""
+from google.protobuf.internal import builder as _builder
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import descriptor_pool as _descriptor_pool
+from google.protobuf import symbol_database as _symbol_database
+# @@protoc_insertion_point(imports)
+
+_sym_db = _symbol_database.Default()
+
+
+
+
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x1egoogle/protobuf/duration.proto\x12\x0fgoogle.protobuf\"*\n\x08\x44uration\x12\x0f\n\x07seconds\x18\x01 \x01(\x03\x12\r\n\x05nanos\x18\x02 \x01(\x05\x42\x83\x01\n\x13\x63om.google.protobufB\rDurationProtoP\x01Z1google.golang.org/protobuf/types/known/durationpb\xf8\x01\x01\xa2\x02\x03GPB\xaa\x02\x1eGoogle.Protobuf.WellKnownTypesb\x06proto3')
+
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'google.protobuf.duration_pb2', globals())
+if _descriptor._USE_C_DESCRIPTORS == False:
+
+  DESCRIPTOR._options = None
+  DESCRIPTOR._serialized_options = b'\n\023com.google.protobufB\rDurationProtoP\001Z1google.golang.org/protobuf/types/known/durationpb\370\001\001\242\002\003GPB\252\002\036Google.Protobuf.WellKnownTypes'
+  _DURATION._serialized_start=51
+  _DURATION._serialized_end=93
+# @@protoc_insertion_point(module_scope)

lib/protobuf/empty_pb2.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/empty.proto
+"""Generated protocol buffer code."""
+from google.protobuf.internal import builder as _builder
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import descriptor_pool as _descriptor_pool
+from google.protobuf import symbol_database as _symbol_database
+# @@protoc_insertion_point(imports)
+
+_sym_db = _symbol_database.Default()
+
+
+
+
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x1bgoogle/protobuf/empty.proto\x12\x0fgoogle.protobuf\"\x07\n\x05\x45mptyB}\n\x13\x63om.google.protobufB\nEmptyProtoP\x01Z.google.golang.org/protobuf/types/known/emptypb\xf8\x01\x01\xa2\x02\x03GPB\xaa\x02\x1eGoogle.Protobuf.WellKnownTypesb\x06proto3')
+
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'google.protobuf.empty_pb2', globals())
+if _descriptor._USE_C_DESCRIPTORS == False:
+
+  DESCRIPTOR._options = None
+  DESCRIPTOR._serialized_options = b'\n\023com.google.protobufB\nEmptyProtoP\001Z.google.golang.org/protobuf/types/known/emptypb\370\001\001\242\002\003GPB\252\002\036Google.Protobuf.WellKnownTypes'
+  _EMPTY._serialized_start=48
+  _EMPTY._serialized_end=55
+# @@protoc_insertion_point(module_scope)

lib/protobuf/field_mask_pb2.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/field_mask.proto
+"""Generated protocol buffer code."""
+from google.protobuf.internal import builder as _builder
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import descriptor_pool as _descriptor_pool
+from google.protobuf import symbol_database as _symbol_database
+# @@protoc_insertion_point(imports)
+
+_sym_db = _symbol_database.Default()
+
+
+
+
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n google/protobuf/field_mask.proto\x12\x0fgoogle.protobuf\"\x1a\n\tFieldMask\x12\r\n\x05paths\x18\x01 \x03(\tB\x85\x01\n\x13\x63om.google.protobufB\x0e\x46ieldMaskProtoP\x01Z2google.golang.org/protobuf/types/known/fieldmaskpb\xf8\x01\x01\xa2\x02\x03GPB\xaa\x02\x1eGoogle.Protobuf.WellKnownTypesb\x06proto3')
+
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'google.protobuf.field_mask_pb2', globals())
+if _descriptor._USE_C_DESCRIPTORS == False:
+
+  DESCRIPTOR._options = None
+  DESCRIPTOR._serialized_options = b'\n\023com.google.protobufB\016FieldMaskProtoP\001Z2google.golang.org/protobuf/types/known/fieldmaskpb\370\001\001\242\002\003GPB\252\002\036Google.Protobuf.WellKnownTypes'
+  _FIELDMASK._serialized_start=53
+  _FIELDMASK._serialized_end=79
+# @@protoc_insertion_point(module_scope)

lib/protobuf/internal/api_implementation.py

@@ -0,0 +1,112 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Determine which implementation of the protobuf API is used in this process.
+"""
+
+import os
+import sys
+import warnings
+
+try:
+  # pylint: disable=g-import-not-at-top
+  from google.protobuf.internal import _api_implementation
+  # The compile-time constants in the _api_implementation module can be used to
+  # switch to a certain implementation of the Python API at build time.
+  _api_version = _api_implementation.api_version
+except ImportError:
+  _api_version = -1  # Unspecified by compiler flags.
+
+if _api_version == 1:
+  raise ValueError('api_version=1 is no longer supported.')
+
+
+_default_implementation_type = ('cpp' if _api_version > 0 else 'python')
+
+
+# This environment variable can be used to switch to a certain implementation
+# of the Python API, overriding the compile-time constants in the
+# _api_implementation module. Right now only 'python' and 'cpp' are valid
+# values. Any other value will be ignored.
+_implementation_type = os.getenv('PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION',
+                                 _default_implementation_type)
+
+if _implementation_type != 'python':
+  _implementation_type = 'cpp'
+
+if 'PyPy' in sys.version and _implementation_type == 'cpp':
+  warnings.warn('PyPy does not work yet with cpp protocol buffers. '
+                'Falling back to the python implementation.')
+  _implementation_type = 'python'
+
+
+# Detect if serialization should be deterministic by default
+try:
+  # The presence of this module in a build allows the proto implementation to
+  # be upgraded merely via build deps.
+  #
+  # NOTE: Merely importing this automatically enables deterministic proto
+  # serialization for C++ code, but we still need to export it as a boolean so
+  # that we can do the same for `_implementation_type == 'python'`.
+  #
+  # NOTE2: It is possible for C++ code to enable deterministic serialization by
+  # default _without_ affecting Python code, if the C++ implementation is not in
+  # use by this module.  That is intended behavior, so we don't actually expose
+  # this boolean outside of this module.
+  #
+  # pylint: disable=g-import-not-at-top,unused-import
+  from google.protobuf import enable_deterministic_proto_serialization
+  _python_deterministic_proto_serialization = True
+except ImportError:
+  _python_deterministic_proto_serialization = False
+
+
+# Usage of this function is discouraged. Clients shouldn't care which
+# implementation of the API is in use. Note that there is no guarantee
+# that differences between APIs will be maintained.
+# Please don't use this function if possible.
+def Type():
+  return _implementation_type
+
+
+def _SetType(implementation_type):
+  """Never use! Only for protobuf benchmark."""
+  global _implementation_type
+  _implementation_type = implementation_type
+
+
+# See comment on 'Type' above.
+def Version():
+  return 2
+
+
+# For internal use only
+def IsPythonDefaultSerializationDeterministic():
+  return _python_deterministic_proto_serialization

lib/protobuf/internal/builder.py

@@ -0,0 +1,130 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Builds descriptors, message classes and services for generated _pb2.py.
+
+This file is only called in python generated _pb2.py files. It builds
+descriptors, message classes and services that users can directly use
+in generated code.
+"""
+
+__author__ = 'jieluo@google.com (Jie Luo)'
+
+from google.protobuf.internal import enum_type_wrapper
+from google.protobuf import message as _message
+from google.protobuf import reflection as _reflection
+from google.protobuf import symbol_database as _symbol_database
+
+_sym_db = _symbol_database.Default()
+
+
+def BuildMessageAndEnumDescriptors(file_des, module):
+  """Builds message and enum descriptors.
+
+  Args:
+    file_des: FileDescriptor of the .proto file
+    module: Generated _pb2 module
+  """
+
+  def BuildNestedDescriptors(msg_des, prefix):
+    for (name, nested_msg) in msg_des.nested_types_by_name.items():
+      module_name = prefix + name.upper()
+      module[module_name] = nested_msg
+      BuildNestedDescriptors(nested_msg, module_name + '_')
+    for enum_des in msg_des.enum_types:
+      module[prefix + enum_des.name.upper()] = enum_des
+
+  for (name, msg_des) in file_des.message_types_by_name.items():
+    module_name = '_' + name.upper()
+    module[module_name] = msg_des
+    BuildNestedDescriptors(msg_des, module_name + '_')
+
+
+def BuildTopDescriptorsAndMessages(file_des, module_name, module):
+  """Builds top level descriptors and message classes.
+
+  Args:
+    file_des: FileDescriptor of the .proto file
+    module_name: str, the name of generated _pb2 module
+    module: Generated _pb2 module
+  """
+
+  def BuildMessage(msg_des):
+    create_dict = {}
+    for (name, nested_msg) in msg_des.nested_types_by_name.items():
+      create_dict[name] = BuildMessage(nested_msg)
+    create_dict['DESCRIPTOR'] = msg_des
+    create_dict['__module__'] = module_name
+    message_class = _reflection.GeneratedProtocolMessageType(
+        msg_des.name, (_message.Message,), create_dict)
+    _sym_db.RegisterMessage(message_class)
+    return message_class
+
+  # top level enums
+  for (name, enum_des) in file_des.enum_types_by_name.items():
+    module['_' + name.upper()] = enum_des
+    module[name] = enum_type_wrapper.EnumTypeWrapper(enum_des)
+    for enum_value in enum_des.values:
+      module[enum_value.name] = enum_value.number
+
+  # top level extensions
+  for (name, extension_des) in file_des.extensions_by_name.items():
+    module[name.upper() + '_FIELD_NUMBER'] = extension_des.number
+    module[name] = extension_des
+
+  # services
+  for (name, service) in file_des.services_by_name.items():
+    module['_' + name.upper()] = service
+
+  # Build messages.
+  for (name, msg_des) in file_des.message_types_by_name.items():
+    module[name] = BuildMessage(msg_des)
+
+
+def BuildServices(file_des, module_name, module):
+  """Builds services classes and services stub class.
+
+  Args:
+    file_des: FileDescriptor of the .proto file
+    module_name: str, the name of generated _pb2 module
+    module: Generated _pb2 module
+  """
+  # pylint: disable=g-import-not-at-top
+  from google.protobuf import service as _service
+  from google.protobuf import service_reflection
+  # pylint: enable=g-import-not-at-top
+  for (name, service) in file_des.services_by_name.items():
+    module[name] = service_reflection.GeneratedServiceType(
+        name, (_service.Service,),
+        dict(DESCRIPTOR=service, __module__=module_name))
+    stub_name = name + '_Stub'
+    module[stub_name] = service_reflection.GeneratedServiceStubType(
+        stub_name, (module[name],),
+        dict(DESCRIPTOR=service, __module__=module_name))

lib/protobuf/internal/containers.py

@@ -0,0 +1,710 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Contains container classes to represent different protocol buffer types.
+
+This file defines container classes which represent categories of protocol
+buffer field types which need extra maintenance. Currently these categories
+are:
+
+-   Repeated scalar fields - These are all repeated fields which aren't
+    composite (e.g. they are of simple types like int32, string, etc).
+-   Repeated composite fields - Repeated fields which are composite. This
+    includes groups and nested messages.
+"""
+
+import collections.abc
+import copy
+import pickle
+from typing import (
+    Any,
+    Iterable,
+    Iterator,
+    List,
+    MutableMapping,
+    MutableSequence,
+    NoReturn,
+    Optional,
+    Sequence,
+    TypeVar,
+    Union,
+    overload,
+)
+
+
+_T = TypeVar('_T')
+_K = TypeVar('_K')
+_V = TypeVar('_V')
+
+
+class BaseContainer(Sequence[_T]):
+  """Base container class."""
+
+  # Minimizes memory usage and disallows assignment to other attributes.
+  __slots__ = ['_message_listener', '_values']
+
+  def __init__(self, message_listener: Any) -> None:
+    """
+    Args:
+      message_listener: A MessageListener implementation.
+        The RepeatedScalarFieldContainer will call this object's
+        Modified() method when it is modified.
+    """
+    self._message_listener = message_listener
+    self._values = []
+
+  @overload
+  def __getitem__(self, key: int) -> _T:
+    ...
+
+  @overload
+  def __getitem__(self, key: slice) -> List[_T]:
+    ...
+
+  def __getitem__(self, key):
+    """Retrieves item by the specified key."""
+    return self._values[key]
+
+  def __len__(self) -> int:
+    """Returns the number of elements in the container."""
+    return len(self._values)
+
+  def __ne__(self, other: Any) -> bool:
+    """Checks if another instance isn't equal to this one."""
+    # The concrete classes should define __eq__.
+    return not self == other
+
+  __hash__ = None
+
+  def __repr__(self) -> str:
+    return repr(self._values)
+
+  def sort(self, *args, **kwargs) -> None:
+    # Continue to support the old sort_function keyword argument.
+    # This is expected to be a rare occurrence, so use LBYL to avoid
+    # the overhead of actually catching KeyError.
+    if 'sort_function' in kwargs:
+      kwargs['cmp'] = kwargs.pop('sort_function')
+    self._values.sort(*args, **kwargs)
+
+  def reverse(self) -> None:
+    self._values.reverse()
+
+
+# TODO(slebedev): Remove this. BaseContainer does *not* conform to
+# MutableSequence, only its subclasses do.
+collections.abc.MutableSequence.register(BaseContainer)
+
+
+class RepeatedScalarFieldContainer(BaseContainer[_T], MutableSequence[_T]):
+  """Simple, type-checked, list-like container for holding repeated scalars."""
+
+  # Disallows assignment to other attributes.
+  __slots__ = ['_type_checker']
+
+  def __init__(
+      self,
+      message_listener: Any,
+      type_checker: Any,
+  ) -> None:
+    """Args:
+
+      message_listener: A MessageListener implementation. The
+      RepeatedScalarFieldContainer will call this object's Modified() method
+      when it is modified.
+      type_checker: A type_checkers.ValueChecker instance to run on elements
+      inserted into this container.
+    """
+    super().__init__(message_listener)
+    self._type_checker = type_checker
+
+  def append(self, value: _T) -> None:
+    """Appends an item to the list. Similar to list.append()."""
+    self._values.append(self._type_checker.CheckValue(value))
+    if not self._message_listener.dirty:
+      self._message_listener.Modified()
+
+  def insert(self, key: int, value: _T) -> None:
+    """Inserts the item at the specified position. Similar to list.insert()."""
+    self._values.insert(key, self._type_checker.CheckValue(value))
+    if not self._message_listener.dirty:
+      self._message_listener.Modified()
+
+  def extend(self, elem_seq: Iterable[_T]) -> None:
+    """Extends by appending the given iterable. Similar to list.extend()."""
+    if elem_seq is None:
+      return
+    try:
+      elem_seq_iter = iter(elem_seq)
+    except TypeError:
+      if not elem_seq:
+        # silently ignore falsy inputs :-/.
+        # TODO(ptucker): Deprecate this behavior. b/18413862
+        return
+      raise
+
+    new_values = [self._type_checker.CheckValue(elem) for elem in elem_seq_iter]
+    if new_values:
+      self._values.extend(new_values)
+    self._message_listener.Modified()
+
+  def MergeFrom(
+      self,
+      other: Union['RepeatedScalarFieldContainer[_T]', Iterable[_T]],
+  ) -> None:
+    """Appends the contents of another repeated field of the same type to this
+    one. We do not check the types of the individual fields.
+    """
+    self._values.extend(other)
+    self._message_listener.Modified()
+
+  def remove(self, elem: _T):
+    """Removes an item from the list. Similar to list.remove()."""
+    self._values.remove(elem)
+    self._message_listener.Modified()
+
+  def pop(self, key: Optional[int] = -1) -> _T:
+    """Removes and returns an item at a given index. Similar to list.pop()."""
+    value = self._values[key]
+    self.__delitem__(key)
+    return value
+
+  @overload
+  def __setitem__(self, key: int, value: _T) -> None:
+    ...
+
+  @overload
+  def __setitem__(self, key: slice, value: Iterable[_T]) -> None:
+    ...
+
+  def __setitem__(self, key, value) -> None:
+    """Sets the item on the specified position."""
+    if isinstance(key, slice):
+      if key.step is not None:
+        raise ValueError('Extended slices not supported')
+      self._values[key] = map(self._type_checker.CheckValue, value)
+      self._message_listener.Modified()
+    else:
+      self._values[key] = self._type_checker.CheckValue(value)
+      self._message_listener.Modified()
+
+  def __delitem__(self, key: Union[int, slice]) -> None:
+    """Deletes the item at the specified position."""
+    del self._values[key]
+    self._message_listener.Modified()
+
+  def __eq__(self, other: Any) -> bool:
+    """Compares the current instance with another one."""
+    if self is other:
+      return True
+    # Special case for the same type which should be common and fast.
+    if isinstance(other, self.__class__):
+      return other._values == self._values
+    # We are presumably comparing against some other sequence type.
+    return other == self._values
+
+  def __deepcopy__(
+      self,
+      unused_memo: Any = None,
+  ) -> 'RepeatedScalarFieldContainer[_T]':
+    clone = RepeatedScalarFieldContainer(
+        copy.deepcopy(self._message_listener), self._type_checker)
+    clone.MergeFrom(self)
+    return clone
+
+  def __reduce__(self, **kwargs) -> NoReturn:
+    raise pickle.PickleError(
+        "Can't pickle repeated scalar fields, convert to list first")
+
+
+# TODO(slebedev): Constrain T to be a subtype of Message.
+class RepeatedCompositeFieldContainer(BaseContainer[_T], MutableSequence[_T]):
+  """Simple, list-like container for holding repeated composite fields."""
+
+  # Disallows assignment to other attributes.
+  __slots__ = ['_message_descriptor']
+
+  def __init__(self, message_listener: Any, message_descriptor: Any) -> None:
+    """
+    Note that we pass in a descriptor instead of the generated directly,
+    since at the time we construct a _RepeatedCompositeFieldContainer we
+    haven't yet necessarily initialized the type that will be contained in the
+    container.
+
+    Args:
+      message_listener: A MessageListener implementation.
+        The RepeatedCompositeFieldContainer will call this object's
+        Modified() method when it is modified.
+      message_descriptor: A Descriptor instance describing the protocol type
+        that should be present in this container.  We'll use the
+        _concrete_class field of this descriptor when the client calls add().
+    """
+    super().__init__(message_listener)
+    self._message_descriptor = message_descriptor
+
+  def add(self, **kwargs: Any) -> _T:
+    """Adds a new element at the end of the list and returns it. Keyword
+    arguments may be used to initialize the element.
+    """
+    new_element = self._message_descriptor._concrete_class(**kwargs)
+    new_element._SetListener(self._message_listener)
+    self._values.append(new_element)
+    if not self._message_listener.dirty:
+      self._message_listener.Modified()
+    return new_element
+
+  def append(self, value: _T) -> None:
+    """Appends one element by copying the message."""
+    new_element = self._message_descriptor._concrete_class()
+    new_element._SetListener(self._message_listener)
+    new_element.CopyFrom(value)
+    self._values.append(new_element)
+    if not self._message_listener.dirty:
+      self._message_listener.Modified()
+
+  def insert(self, key: int, value: _T) -> None:
+    """Inserts the item at the specified position by copying."""
+    new_element = self._message_descriptor._concrete_class()
+    new_element._SetListener(self._message_listener)
+    new_element.CopyFrom(value)
+    self._values.insert(key, new_element)
+    if not self._message_listener.dirty:
+      self._message_listener.Modified()
+
+  def extend(self, elem_seq: Iterable[_T]) -> None:
+    """Extends by appending the given sequence of elements of the same type
+
+    as this one, copying each individual message.
+    """
+    message_class = self._message_descriptor._concrete_class
+    listener = self._message_listener
+    values = self._values
+    for message in elem_seq:
+      new_element = message_class()
+      new_element._SetListener(listener)
+      new_element.MergeFrom(message)
+      values.append(new_element)
+    listener.Modified()
+
+  def MergeFrom(
+      self,
+      other: Union['RepeatedCompositeFieldContainer[_T]', Iterable[_T]],
+  ) -> None:
+    """Appends the contents of another repeated field of the same type to this
+    one, copying each individual message.
+    """
+    self.extend(other)
+
+  def remove(self, elem: _T) -> None:
+    """Removes an item from the list. Similar to list.remove()."""
+    self._values.remove(elem)
+    self._message_listener.Modified()
+
+  def pop(self, key: Optional[int] = -1) -> _T:
+    """Removes and returns an item at a given index. Similar to list.pop()."""
+    value = self._values[key]
+    self.__delitem__(key)
+    return value
+
+  @overload
+  def __setitem__(self, key: int, value: _T) -> None:
+    ...
+
+  @overload
+  def __setitem__(self, key: slice, value: Iterable[_T]) -> None:
+    ...
+
+  def __setitem__(self, key, value):
+    # This method is implemented to make RepeatedCompositeFieldContainer
+    # structurally compatible with typing.MutableSequence. It is
+    # otherwise unsupported and will always raise an error.
+    raise TypeError(
+        f'{self.__class__.__name__} object does not support item assignment')
+
+  def __delitem__(self, key: Union[int, slice]) -> None:
+    """Deletes the item at the specified position."""
+    del self._values[key]
+    self._message_listener.Modified()
+
+  def __eq__(self, other: Any) -> bool:
+    """Compares the current instance with another one."""
+    if self is other:
+      return True
+    if not isinstance(other, self.__class__):
+      raise TypeError('Can only compare repeated composite fields against '
+                      'other repeated composite fields.')
+    return self._values == other._values
+
+
+class ScalarMap(MutableMapping[_K, _V]):
+  """Simple, type-checked, dict-like container for holding repeated scalars."""
+
+  # Disallows assignment to other attributes.
+  __slots__ = ['_key_checker', '_value_checker', '_values', '_message_listener',
+               '_entry_descriptor']
+
+  def __init__(
+      self,
+      message_listener: Any,
+      key_checker: Any,
+      value_checker: Any,
+      entry_descriptor: Any,
+  ) -> None:
+    """
+    Args:
+      message_listener: A MessageListener implementation.
+        The ScalarMap will call this object's Modified() method when it
+        is modified.
+      key_checker: A type_checkers.ValueChecker instance to run on keys
+        inserted into this container.
+      value_checker: A type_checkers.ValueChecker instance to run on values
+        inserted into this container.
+      entry_descriptor: The MessageDescriptor of a map entry: key and value.
+    """
+    self._message_listener = message_listener
+    self._key_checker = key_checker
+    self._value_checker = value_checker
+    self._entry_descriptor = entry_descriptor
+    self._values = {}
+
+  def __getitem__(self, key: _K) -> _V:
+    try:
+      return self._values[key]
+    except KeyError:
+      key = self._key_checker.CheckValue(key)
+      val = self._value_checker.DefaultValue()
+      self._values[key] = val
+      return val
+
+  def __contains__(self, item: _K) -> bool:
+    # We check the key's type to match the strong-typing flavor of the API.
+    # Also this makes it easier to match the behavior of the C++ implementation.
+    self._key_checker.CheckValue(item)
+    return item in self._values
+
+  @overload
+  def get(self, key: _K) -> Optional[_V]:
+    ...
+
+  @overload
+  def get(self, key: _K, default: _T) -> Union[_V, _T]:
+    ...
+
+  # We need to override this explicitly, because our defaultdict-like behavior
+  # will make the default implementation (from our base class) always insert
+  # the key.
+  def get(self, key, default=None):
+    if key in self:
+      return self[key]
+    else:
+      return default
+
+  def __setitem__(self, key: _K, value: _V) -> _T:
+    checked_key = self._key_checker.CheckValue(key)
+    checked_value = self._value_checker.CheckValue(value)
+    self._values[checked_key] = checked_value
+    self._message_listener.Modified()
+
+  def __delitem__(self, key: _K) -> None:
+    del self._values[key]
+    self._message_listener.Modified()
+
+  def __len__(self) -> int:
+    return len(self._values)
+
+  def __iter__(self) -> Iterator[_K]:
+    return iter(self._values)
+
+  def __repr__(self) -> str:
+    return repr(self._values)
+
+  def MergeFrom(self, other: 'ScalarMap[_K, _V]') -> None:
+    self._values.update(other._values)
+    self._message_listener.Modified()
+
+  def InvalidateIterators(self) -> None:
+    # It appears that the only way to reliably invalidate iterators to
+    # self._values is to ensure that its size changes.
+    original = self._values
+    self._values = original.copy()
+    original[None] = None
+
+  # This is defined in the abstract base, but we can do it much more cheaply.
+  def clear(self) -> None:
+    self._values.clear()
+    self._message_listener.Modified()
+
+  def GetEntryClass(self) -> Any:
+    return self._entry_descriptor._concrete_class
+
+
+class MessageMap(MutableMapping[_K, _V]):
+  """Simple, type-checked, dict-like container for with submessage values."""
+
+  # Disallows assignment to other attributes.
+  __slots__ = ['_key_checker', '_values', '_message_listener',
+               '_message_descriptor', '_entry_descriptor']
+
+  def __init__(
+      self,
+      message_listener: Any,
+      message_descriptor: Any,
+      key_checker: Any,
+      entry_descriptor: Any,
+  ) -> None:
+    """
+    Args:
+      message_listener: A MessageListener implementation.
+        The ScalarMap will call this object's Modified() method when it
+        is modified.
+      key_checker: A type_checkers.ValueChecker instance to run on keys
+        inserted into this container.
+      value_checker: A type_checkers.ValueChecker instance to run on values
+        inserted into this container.
+      entry_descriptor: The MessageDescriptor of a map entry: key and value.
+    """
+    self._message_listener = message_listener
+    self._message_descriptor = message_descriptor
+    self._key_checker = key_checker
+    self._entry_descriptor = entry_descriptor
+    self._values = {}
+
+  def __getitem__(self, key: _K) -> _V:
+    key = self._key_checker.CheckValue(key)
+    try:
+      return self._values[key]
+    except KeyError:
+      new_element = self._message_descriptor._concrete_class()
+      new_element._SetListener(self._message_listener)
+      self._values[key] = new_element
+      self._message_listener.Modified()
+      return new_element
+
+  def get_or_create(self, key: _K) -> _V:
+    """get_or_create() is an alias for getitem (ie. map[key]).
+
+    Args:
+      key: The key to get or create in the map.
+
+    This is useful in cases where you want to be explicit that the call is
+    mutating the map.  This can avoid lint errors for statements like this
+    that otherwise would appear to be pointless statements:
+
+      msg.my_map[key]
+    """
+    return self[key]
+
+  @overload
+  def get(self, key: _K) -> Optional[_V]:
+    ...
+
+  @overload
+  def get(self, key: _K, default: _T) -> Union[_V, _T]:
+    ...
+
+  # We need to override this explicitly, because our defaultdict-like behavior
+  # will make the default implementation (from our base class) always insert
+  # the key.
+  def get(self, key, default=None):
+    if key in self:
+      return self[key]
+    else:
+      return default
+
+  def __contains__(self, item: _K) -> bool:
+    item = self._key_checker.CheckValue(item)
+    return item in self._values
+
+  def __setitem__(self, key: _K, value: _V) -> NoReturn:
+    raise ValueError('May not set values directly, call my_map[key].foo = 5')
+
+  def __delitem__(self, key: _K) -> None:
+    key = self._key_checker.CheckValue(key)
+    del self._values[key]
+    self._message_listener.Modified()
+
+  def __len__(self) -> int:
+    return len(self._values)
+
+  def __iter__(self) -> Iterator[_K]:
+    return iter(self._values)
+
+  def __repr__(self) -> str:
+    return repr(self._values)
+
+  def MergeFrom(self, other: 'MessageMap[_K, _V]') -> None:
+    # pylint: disable=protected-access
+    for key in other._values:
+      # According to documentation: "When parsing from the wire or when merging,
+      # if there are duplicate map keys the last key seen is used".
+      if key in self:
+        del self[key]
+      self[key].CopyFrom(other[key])
+    # self._message_listener.Modified() not required here, because
+    # mutations to submessages already propagate.
+
+  def InvalidateIterators(self) -> None:
+    # It appears that the only way to reliably invalidate iterators to
+    # self._values is to ensure that its size changes.
+    original = self._values
+    self._values = original.copy()
+    original[None] = None
+
+  # This is defined in the abstract base, but we can do it much more cheaply.
+  def clear(self) -> None:
+    self._values.clear()
+    self._message_listener.Modified()
+
+  def GetEntryClass(self) -> Any:
+    return self._entry_descriptor._concrete_class
+
+
+class _UnknownField:
+  """A parsed unknown field."""
+
+  # Disallows assignment to other attributes.
+  __slots__ = ['_field_number', '_wire_type', '_data']
+
+  def __init__(self, field_number, wire_type, data):
+    self._field_number = field_number
+    self._wire_type = wire_type
+    self._data = data
+    return
+
+  def __lt__(self, other):
+    # pylint: disable=protected-access
+    return self._field_number < other._field_number
+
+  def __eq__(self, other):
+    if self is other:
+      return True
+    # pylint: disable=protected-access
+    return (self._field_number == other._field_number and
+            self._wire_type == other._wire_type and
+            self._data == other._data)
+
+
+class UnknownFieldRef:  # pylint: disable=missing-class-docstring
+
+  def __init__(self, parent, index):
+    self._parent = parent
+    self._index = index
+
+  def _check_valid(self):
+    if not self._parent:
+      raise ValueError('UnknownField does not exist. '
+                       'The parent message might be cleared.')
+    if self._index >= len(self._parent):
+      raise ValueError('UnknownField does not exist. '
+                       'The parent message might be cleared.')
+
+  @property
+  def field_number(self):
+    self._check_valid()
+    # pylint: disable=protected-access
+    return self._parent._internal_get(self._index)._field_number
+
+  @property
+  def wire_type(self):
+    self._check_valid()
+    # pylint: disable=protected-access
+    return self._parent._internal_get(self._index)._wire_type
+
+  @property
+  def data(self):
+    self._check_valid()
+    # pylint: disable=protected-access
+    return self._parent._internal_get(self._index)._data
+
+
+class UnknownFieldSet:
+  """UnknownField container"""
+
+  # Disallows assignment to other attributes.
+  __slots__ = ['_values']
+
+  def __init__(self):
+    self._values = []
+
+  def __getitem__(self, index):
+    if self._values is None:
+      raise ValueError('UnknownFields does not exist. '
+                       'The parent message might be cleared.')
+    size = len(self._values)
+    if index < 0:
+      index += size
+    if index < 0 or index >= size:
+      raise IndexError('index %d out of range'.index)
+
+    return UnknownFieldRef(self, index)
+
+  def _internal_get(self, index):
+    return self._values[index]
+
+  def __len__(self):
+    if self._values is None:
+      raise ValueError('UnknownFields does not exist. '
+                       'The parent message might be cleared.')
+    return len(self._values)
+
+  def _add(self, field_number, wire_type, data):
+    unknown_field = _UnknownField(field_number, wire_type, data)
+    self._values.append(unknown_field)
+    return unknown_field
+
+  def __iter__(self):
+    for i in range(len(self)):
+      yield UnknownFieldRef(self, i)
+
+  def _extend(self, other):
+    if other is None:
+      return
+    # pylint: disable=protected-access
+    self._values.extend(other._values)
+
+  def __eq__(self, other):
+    if self is other:
+      return True
+    # Sort unknown fields because their order shouldn't
+    # affect equality test.
+    values = list(self._values)
+    if other is None:
+      return not values
+    values.sort()
+    # pylint: disable=protected-access
+    other_values = sorted(other._values)
+    return values == other_values
+
+  def _clear(self):
+    for value in self._values:
+      # pylint: disable=protected-access
+      if isinstance(value._data, UnknownFieldSet):
+        value._data._clear()  # pylint: disable=protected-access
+    self._values = None

lib/protobuf/internal/encoder.py

@@ -0,0 +1,829 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Code for encoding protocol message primitives.
+
+Contains the logic for encoding every logical protocol field type
+into one of the 5 physical wire types.
+
+This code is designed to push the Python interpreter's performance to the
+limits.
+
+The basic idea is that at startup time, for every field (i.e. every
+FieldDescriptor) we construct two functions:  a "sizer" and an "encoder".  The
+sizer takes a value of this field's type and computes its byte size.  The
+encoder takes a writer function and a value.  It encodes the value into byte
+strings and invokes the writer function to write those strings.  Typically the
+writer function is the write() method of a BytesIO.
+
+We try to do as much work as possible when constructing the writer and the
+sizer rather than when calling them.  In particular:
+* We copy any needed global functions to local variables, so that we do not need
+  to do costly global table lookups at runtime.
+* Similarly, we try to do any attribute lookups at startup time if possible.
+* Every field's tag is encoded to bytes at startup, since it can't change at
+  runtime.
+* Whatever component of the field size we can compute at startup, we do.
+* We *avoid* sharing code if doing so would make the code slower and not sharing
+  does not burden us too much.  For example, encoders for repeated fields do
+  not just call the encoders for singular fields in a loop because this would
+  add an extra function call overhead for every loop iteration; instead, we
+  manually inline the single-value encoder into the loop.
+* If a Python function lacks a return statement, Python actually generates
+  instructions to pop the result of the last statement off the stack, push
+  None onto the stack, and then return that.  If we really don't care what
+  value is returned, then we can save two instructions by returning the
+  result of the last statement.  It looks funny but it helps.
+* We assume that type and bounds checking has happened at a higher level.
+"""
+
+__author__ = 'kenton@google.com (Kenton Varda)'
+
+import struct
+
+from google.protobuf.internal import wire_format
+
+
+# This will overflow and thus become IEEE-754 "infinity".  We would use
+# "float('inf')" but it doesn't work on Windows pre-Python-2.6.
+_POS_INF = 1e10000
+_NEG_INF = -_POS_INF
+
+
+def _VarintSize(value):
+  """Compute the size of a varint value."""
+  if value <= 0x7f: return 1
+  if value <= 0x3fff: return 2
+  if value <= 0x1fffff: return 3
+  if value <= 0xfffffff: return 4
+  if value <= 0x7ffffffff: return 5
+  if value <= 0x3ffffffffff: return 6
+  if value <= 0x1ffffffffffff: return 7
+  if value <= 0xffffffffffffff: return 8
+  if value <= 0x7fffffffffffffff: return 9
+  return 10
+
+
+def _SignedVarintSize(value):
+  """Compute the size of a signed varint value."""
+  if value < 0: return 10
+  if value <= 0x7f: return 1
+  if value <= 0x3fff: return 2
+  if value <= 0x1fffff: return 3
+  if value <= 0xfffffff: return 4
+  if value <= 0x7ffffffff: return 5
+  if value <= 0x3ffffffffff: return 6
+  if value <= 0x1ffffffffffff: return 7
+  if value <= 0xffffffffffffff: return 8
+  if value <= 0x7fffffffffffffff: return 9
+  return 10
+
+
+def _TagSize(field_number):
+  """Returns the number of bytes required to serialize a tag with this field
+  number."""
+  # Just pass in type 0, since the type won't affect the tag+type size.
+  return _VarintSize(wire_format.PackTag(field_number, 0))
+
+
+# --------------------------------------------------------------------
+# In this section we define some generic sizers.  Each of these functions
+# takes parameters specific to a particular field type, e.g. int32 or fixed64.
+# It returns another function which in turn takes parameters specific to a
+# particular field, e.g. the field number and whether it is repeated or packed.
+# Look at the next section to see how these are used.
+
+
+def _SimpleSizer(compute_value_size):
+  """A sizer which uses the function compute_value_size to compute the size of
+  each value.  Typically compute_value_size is _VarintSize."""
+
+  def SpecificSizer(field_number, is_repeated, is_packed):
+    tag_size = _TagSize(field_number)
+    if is_packed:
+      local_VarintSize = _VarintSize
+      def PackedFieldSize(value):
+        result = 0
+        for element in value:
+          result += compute_value_size(element)
+        return result + local_VarintSize(result) + tag_size
+      return PackedFieldSize
+    elif is_repeated:
+      def RepeatedFieldSize(value):
+        result = tag_size * len(value)
+        for element in value:
+          result += compute_value_size(element)
+        return result
+      return RepeatedFieldSize
+    else:
+      def FieldSize(value):
+        return tag_size + compute_value_size(value)
+      return FieldSize
+
+  return SpecificSizer
+
+
+def _ModifiedSizer(compute_value_size, modify_value):
+  """Like SimpleSizer, but modify_value is invoked on each value before it is
+  passed to compute_value_size.  modify_value is typically ZigZagEncode."""
+
+  def SpecificSizer(field_number, is_repeated, is_packed):
+    tag_size = _TagSize(field_number)
+    if is_packed:
+      local_VarintSize = _VarintSize
+      def PackedFieldSize(value):
+        result = 0
+        for element in value:
+          result += compute_value_size(modify_value(element))
+        return result + local_VarintSize(result) + tag_size
+      return PackedFieldSize
+    elif is_repeated:
+      def RepeatedFieldSize(value):
+        result = tag_size * len(value)
+        for element in value:
+          result += compute_value_size(modify_value(element))
+        return result
+      return RepeatedFieldSize
+    else:
+      def FieldSize(value):
+        return tag_size + compute_value_size(modify_value(value))
+      return FieldSize
+
+  return SpecificSizer
+
+
+def _FixedSizer(value_size):
+  """Like _SimpleSizer except for a fixed-size field.  The input is the size
+  of one value."""
+
+  def SpecificSizer(field_number, is_repeated, is_packed):
+    tag_size = _TagSize(field_number)
+    if is_packed:
+      local_VarintSize = _VarintSize
+      def PackedFieldSize(value):
+        result = len(value) * value_size
+        return result + local_VarintSize(result) + tag_size
+      return PackedFieldSize
+    elif is_repeated:
+      element_size = value_size + tag_size
+      def RepeatedFieldSize(value):
+        return len(value) * element_size
+      return RepeatedFieldSize
+    else:
+      field_size = value_size + tag_size
+      def FieldSize(value):
+        return field_size
+      return FieldSize
+
+  return SpecificSizer
+
+
+# ====================================================================
+# Here we declare a sizer constructor for each field type.  Each "sizer
+# constructor" is a function that takes (field_number, is_repeated, is_packed)
+# as parameters and returns a sizer, which in turn takes a field value as
+# a parameter and returns its encoded size.
+
+
+Int32Sizer = Int64Sizer = EnumSizer = _SimpleSizer(_SignedVarintSize)
+
+UInt32Sizer = UInt64Sizer = _SimpleSizer(_VarintSize)
+
+SInt32Sizer = SInt64Sizer = _ModifiedSizer(
+    _SignedVarintSize, wire_format.ZigZagEncode)
+
+Fixed32Sizer = SFixed32Sizer = FloatSizer  = _FixedSizer(4)
+Fixed64Sizer = SFixed64Sizer = DoubleSizer = _FixedSizer(8)
+
+BoolSizer = _FixedSizer(1)
+
+
+def StringSizer(field_number, is_repeated, is_packed):
+  """Returns a sizer for a string field."""
+
+  tag_size = _TagSize(field_number)
+  local_VarintSize = _VarintSize
+  local_len = len
+  assert not is_packed
+  if is_repeated:
+    def RepeatedFieldSize(value):
+      result = tag_size * len(value)
+      for element in value:
+        l = local_len(element.encode('utf-8'))
+        result += local_VarintSize(l) + l
+      return result
+    return RepeatedFieldSize
+  else:
+    def FieldSize(value):
+      l = local_len(value.encode('utf-8'))
+      return tag_size + local_VarintSize(l) + l
+    return FieldSize
+
+
+def BytesSizer(field_number, is_repeated, is_packed):
+  """Returns a sizer for a bytes field."""
+
+  tag_size = _TagSize(field_number)
+  local_VarintSize = _VarintSize
+  local_len = len
+  assert not is_packed
+  if is_repeated:
+    def RepeatedFieldSize(value):
+      result = tag_size * len(value)
+      for element in value:
+        l = local_len(element)
+        result += local_VarintSize(l) + l
+      return result
+    return RepeatedFieldSize
+  else:
+    def FieldSize(value):
+      l = local_len(value)
+      return tag_size + local_VarintSize(l) + l
+    return FieldSize
+
+
+def GroupSizer(field_number, is_repeated, is_packed):
+  """Returns a sizer for a group field."""
+
+  tag_size = _TagSize(field_number) * 2
+  assert not is_packed
+  if is_repeated:
+    def RepeatedFieldSize(value):
+      result = tag_size * len(value)
+      for element in value:
+        result += element.ByteSize()
+      return result
+    return RepeatedFieldSize
+  else:
+    def FieldSize(value):
+      return tag_size + value.ByteSize()
+    return FieldSize
+
+
+def MessageSizer(field_number, is_repeated, is_packed):
+  """Returns a sizer for a message field."""
+
+  tag_size = _TagSize(field_number)
+  local_VarintSize = _VarintSize
+  assert not is_packed
+  if is_repeated:
+    def RepeatedFieldSize(value):
+      result = tag_size * len(value)
+      for element in value:
+        l = element.ByteSize()
+        result += local_VarintSize(l) + l
+      return result
+    return RepeatedFieldSize
+  else:
+    def FieldSize(value):
+      l = value.ByteSize()
+      return tag_size + local_VarintSize(l) + l
+    return FieldSize
+
+
+# --------------------------------------------------------------------
+# MessageSet is special: it needs custom logic to compute its size properly.
+
+
+def MessageSetItemSizer(field_number):
+  """Returns a sizer for extensions of MessageSet.
+
+  The message set message looks like this:
+    message MessageSet {
+      repeated group Item = 1 {
+        required int32 type_id = 2;
+        required string message = 3;
+      }
+    }
+  """
+  static_size = (_TagSize(1) * 2 + _TagSize(2) + _VarintSize(field_number) +
+                 _TagSize(3))
+  local_VarintSize = _VarintSize
+
+  def FieldSize(value):
+    l = value.ByteSize()
+    return static_size + local_VarintSize(l) + l
+
+  return FieldSize
+
+
+# --------------------------------------------------------------------
+# Map is special: it needs custom logic to compute its size properly.
+
+
+def MapSizer(field_descriptor, is_message_map):
+  """Returns a sizer for a map field."""
+
+  # Can't look at field_descriptor.message_type._concrete_class because it may
+  # not have been initialized yet.
+  message_type = field_descriptor.message_type
+  message_sizer = MessageSizer(field_descriptor.number, False, False)
+
+  def FieldSize(map_value):
+    total = 0
+    for key in map_value:
+      value = map_value[key]
+      # It's wasteful to create the messages and throw them away one second
+      # later since we'll do the same for the actual encode.  But there's not an
+      # obvious way to avoid this within the current design without tons of code
+      # duplication. For message map, value.ByteSize() should be called to
+      # update the status.
+      entry_msg = message_type._concrete_class(key=key, value=value)
+      total += message_sizer(entry_msg)
+      if is_message_map:
+        value.ByteSize()
+    return total
+
+  return FieldSize
+
+# ====================================================================
+# Encoders!
+
+
+def _VarintEncoder():
+  """Return an encoder for a basic varint value (does not include tag)."""
+
+  local_int2byte = struct.Struct('>B').pack
+
+  def EncodeVarint(write, value, unused_deterministic=None):
+    bits = value & 0x7f
+    value >>= 7
+    while value:
+      write(local_int2byte(0x80|bits))
+      bits = value & 0x7f
+      value >>= 7
+    return write(local_int2byte(bits))
+
+  return EncodeVarint
+
+
+def _SignedVarintEncoder():
+  """Return an encoder for a basic signed varint value (does not include
+  tag)."""
+
+  local_int2byte = struct.Struct('>B').pack
+
+  def EncodeSignedVarint(write, value, unused_deterministic=None):
+    if value < 0:
+      value += (1 << 64)
+    bits = value & 0x7f
+    value >>= 7
+    while value:
+      write(local_int2byte(0x80|bits))
+      bits = value & 0x7f
+      value >>= 7
+    return write(local_int2byte(bits))
+
+  return EncodeSignedVarint
+
+
+_EncodeVarint = _VarintEncoder()
+_EncodeSignedVarint = _SignedVarintEncoder()
+
+
+def _VarintBytes(value):
+  """Encode the given integer as a varint and return the bytes.  This is only
+  called at startup time so it doesn't need to be fast."""
+
+  pieces = []
+  _EncodeVarint(pieces.append, value, True)
+  return b"".join(pieces)
+
+
+def TagBytes(field_number, wire_type):
+  """Encode the given tag and return the bytes.  Only called at startup."""
+
+  return bytes(_VarintBytes(wire_format.PackTag(field_number, wire_type)))
+
+# --------------------------------------------------------------------
+# As with sizers (see above), we have a number of common encoder
+# implementations.
+
+
+def _SimpleEncoder(wire_type, encode_value, compute_value_size):
+  """Return a constructor for an encoder for fields of a particular type.
+
+  Args:
+      wire_type:  The field's wire type, for encoding tags.
+      encode_value:  A function which encodes an individual value, e.g.
+        _EncodeVarint().
+      compute_value_size:  A function which computes the size of an individual
+        value, e.g. _VarintSize().
+  """
+
+  def SpecificEncoder(field_number, is_repeated, is_packed):
+    if is_packed:
+      tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
+      local_EncodeVarint = _EncodeVarint
+      def EncodePackedField(write, value, deterministic):
+        write(tag_bytes)
+        size = 0
+        for element in value:
+          size += compute_value_size(element)
+        local_EncodeVarint(write, size, deterministic)
+        for element in value:
+          encode_value(write, element, deterministic)
+      return EncodePackedField
+    elif is_repeated:
+      tag_bytes = TagBytes(field_number, wire_type)
+      def EncodeRepeatedField(write, value, deterministic):
+        for element in value:
+          write(tag_bytes)
+          encode_value(write, element, deterministic)
+      return EncodeRepeatedField
+    else:
+      tag_bytes = TagBytes(field_number, wire_type)
+      def EncodeField(write, value, deterministic):
+        write(tag_bytes)
+        return encode_value(write, value, deterministic)
+      return EncodeField
+
+  return SpecificEncoder
+
+
+def _ModifiedEncoder(wire_type, encode_value, compute_value_size, modify_value):
+  """Like SimpleEncoder but additionally invokes modify_value on every value
+  before passing it to encode_value.  Usually modify_value is ZigZagEncode."""
+
+  def SpecificEncoder(field_number, is_repeated, is_packed):
+    if is_packed:
+      tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
+      local_EncodeVarint = _EncodeVarint
+      def EncodePackedField(write, value, deterministic):
+        write(tag_bytes)
+        size = 0
+        for element in value:
+          size += compute_value_size(modify_value(element))
+        local_EncodeVarint(write, size, deterministic)
+        for element in value:
+          encode_value(write, modify_value(element), deterministic)
+      return EncodePackedField
+    elif is_repeated:
+      tag_bytes = TagBytes(field_number, wire_type)
+      def EncodeRepeatedField(write, value, deterministic):
+        for element in value:
+          write(tag_bytes)
+          encode_value(write, modify_value(element), deterministic)
+      return EncodeRepeatedField
+    else:
+      tag_bytes = TagBytes(field_number, wire_type)
+      def EncodeField(write, value, deterministic):
+        write(tag_bytes)
+        return encode_value(write, modify_value(value), deterministic)
+      return EncodeField
+
+  return SpecificEncoder
+
+
+def _StructPackEncoder(wire_type, format):
+  """Return a constructor for an encoder for a fixed-width field.
+
+  Args:
+      wire_type:  The field's wire type, for encoding tags.
+      format:  The format string to pass to struct.pack().
+  """
+
+  value_size = struct.calcsize(format)
+
+  def SpecificEncoder(field_number, is_repeated, is_packed):
+    local_struct_pack = struct.pack
+    if is_packed:
+      tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
+      local_EncodeVarint = _EncodeVarint
+      def EncodePackedField(write, value, deterministic):
+        write(tag_bytes)
+        local_EncodeVarint(write, len(value) * value_size, deterministic)
+        for element in value:
+          write(local_struct_pack(format, element))
+      return EncodePackedField
+    elif is_repeated:
+      tag_bytes = TagBytes(field_number, wire_type)
+      def EncodeRepeatedField(write, value, unused_deterministic=None):
+        for element in value:
+          write(tag_bytes)
+          write(local_struct_pack(format, element))
+      return EncodeRepeatedField
+    else:
+      tag_bytes = TagBytes(field_number, wire_type)
+      def EncodeField(write, value, unused_deterministic=None):
+        write(tag_bytes)
+        return write(local_struct_pack(format, value))
+      return EncodeField
+
+  return SpecificEncoder
+
+
+def _FloatingPointEncoder(wire_type, format):
+  """Return a constructor for an encoder for float fields.
+
+  This is like StructPackEncoder, but catches errors that may be due to
+  passing non-finite floating-point values to struct.pack, and makes a
+  second attempt to encode those values.
+
+  Args:
+      wire_type:  The field's wire type, for encoding tags.
+      format:  The format string to pass to struct.pack().
+  """
+
+  value_size = struct.calcsize(format)
+  if value_size == 4:
+    def EncodeNonFiniteOrRaise(write, value):
+      # Remember that the serialized form uses little-endian byte order.
+      if value == _POS_INF:
+        write(b'\x00\x00\x80\x7F')
+      elif value == _NEG_INF:
+        write(b'\x00\x00\x80\xFF')
+      elif value != value:           # NaN
+        write(b'\x00\x00\xC0\x7F')
+      else:
+        raise
+  elif value_size == 8:
+    def EncodeNonFiniteOrRaise(write, value):
+      if value == _POS_INF:
+        write(b'\x00\x00\x00\x00\x00\x00\xF0\x7F')
+      elif value == _NEG_INF:
+        write(b'\x00\x00\x00\x00\x00\x00\xF0\xFF')
+      elif value != value:                         # NaN
+        write(b'\x00\x00\x00\x00\x00\x00\xF8\x7F')
+      else:
+        raise
+  else:
+    raise ValueError('Can\'t encode floating-point values that are '
+                     '%d bytes long (only 4 or 8)' % value_size)
+
+  def SpecificEncoder(field_number, is_repeated, is_packed):
+    local_struct_pack = struct.pack
+    if is_packed:
+      tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
+      local_EncodeVarint = _EncodeVarint
+      def EncodePackedField(write, value, deterministic):
+        write(tag_bytes)
+        local_EncodeVarint(write, len(value) * value_size, deterministic)
+        for element in value:
+          # This try/except block is going to be faster than any code that
+          # we could write to check whether element is finite.
+          try:
+            write(local_struct_pack(format, element))
+          except SystemError:
+            EncodeNonFiniteOrRaise(write, element)
+      return EncodePackedField
+    elif is_repeated:
+      tag_bytes = TagBytes(field_number, wire_type)
+      def EncodeRepeatedField(write, value, unused_deterministic=None):
+        for element in value:
+          write(tag_bytes)
+          try:
+            write(local_struct_pack(format, element))
+          except SystemError:
+            EncodeNonFiniteOrRaise(write, element)
+      return EncodeRepeatedField
+    else:
+      tag_bytes = TagBytes(field_number, wire_type)
+      def EncodeField(write, value, unused_deterministic=None):
+        write(tag_bytes)
+        try:
+          write(local_struct_pack(format, value))
+        except SystemError:
+          EncodeNonFiniteOrRaise(write, value)
+      return EncodeField
+
+  return SpecificEncoder
+
+
+# ====================================================================
+# Here we declare an encoder constructor for each field type.  These work
+# very similarly to sizer constructors, described earlier.
+
+
+Int32Encoder = Int64Encoder = EnumEncoder = _SimpleEncoder(
+    wire_format.WIRETYPE_VARINT, _EncodeSignedVarint, _SignedVarintSize)
+
+UInt32Encoder = UInt64Encoder = _SimpleEncoder(
+    wire_format.WIRETYPE_VARINT, _EncodeVarint, _VarintSize)
+
+SInt32Encoder = SInt64Encoder = _ModifiedEncoder(
+    wire_format.WIRETYPE_VARINT, _EncodeVarint, _VarintSize,
+    wire_format.ZigZagEncode)
+
+# Note that Python conveniently guarantees that when using the '<' prefix on
+# formats, they will also have the same size across all platforms (as opposed
+# to without the prefix, where their sizes depend on the C compiler's basic
+# type sizes).
+Fixed32Encoder  = _StructPackEncoder(wire_format.WIRETYPE_FIXED32, '<I')
+Fixed64Encoder  = _StructPackEncoder(wire_format.WIRETYPE_FIXED64, '<Q')
+SFixed32Encoder = _StructPackEncoder(wire_format.WIRETYPE_FIXED32, '<i')
+SFixed64Encoder = _StructPackEncoder(wire_format.WIRETYPE_FIXED64, '<q')
+FloatEncoder    = _FloatingPointEncoder(wire_format.WIRETYPE_FIXED32, '<f')
+DoubleEncoder   = _FloatingPointEncoder(wire_format.WIRETYPE_FIXED64, '<d')
+
+
+def BoolEncoder(field_number, is_repeated, is_packed):
+  """Returns an encoder for a boolean field."""
+
+  false_byte = b'\x00'
+  true_byte = b'\x01'
+  if is_packed:
+    tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
+    local_EncodeVarint = _EncodeVarint
+    def EncodePackedField(write, value, deterministic):
+      write(tag_bytes)
+      local_EncodeVarint(write, len(value), deterministic)
+      for element in value:
+        if element:
+          write(true_byte)
+        else:
+          write(false_byte)
+    return EncodePackedField
+  elif is_repeated:
+    tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_VARINT)
+    def EncodeRepeatedField(write, value, unused_deterministic=None):
+      for element in value:
+        write(tag_bytes)
+        if element:
+          write(true_byte)
+        else:
+          write(false_byte)
+    return EncodeRepeatedField
+  else:
+    tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_VARINT)
+    def EncodeField(write, value, unused_deterministic=None):
+      write(tag_bytes)
+      if value:
+        return write(true_byte)
+      return write(false_byte)
+    return EncodeField
+
+
+def StringEncoder(field_number, is_repeated, is_packed):
+  """Returns an encoder for a string field."""
+
+  tag = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
+  local_EncodeVarint = _EncodeVarint
+  local_len = len
+  assert not is_packed
+  if is_repeated:
+    def EncodeRepeatedField(write, value, deterministic):
+      for element in value:
+        encoded = element.encode('utf-8')
+        write(tag)
+        local_EncodeVarint(write, local_len(encoded), deterministic)
+        write(encoded)
+    return EncodeRepeatedField
+  else:
+    def EncodeField(write, value, deterministic):
+      encoded = value.encode('utf-8')
+      write(tag)
+      local_EncodeVarint(write, local_len(encoded), deterministic)
+      return write(encoded)
+    return EncodeField
+
+
+def BytesEncoder(field_number, is_repeated, is_packed):
+  """Returns an encoder for a bytes field."""
+
+  tag = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
+  local_EncodeVarint = _EncodeVarint
+  local_len = len
+  assert not is_packed
+  if is_repeated:
+    def EncodeRepeatedField(write, value, deterministic):
+      for element in value:
+        write(tag)
+        local_EncodeVarint(write, local_len(element), deterministic)
+        write(element)
+    return EncodeRepeatedField
+  else:
+    def EncodeField(write, value, deterministic):
+      write(tag)
+      local_EncodeVarint(write, local_len(value), deterministic)
+      return write(value)
+    return EncodeField
+
+
+def GroupEncoder(field_number, is_repeated, is_packed):
+  """Returns an encoder for a group field."""
+
+  start_tag = TagBytes(field_number, wire_format.WIRETYPE_START_GROUP)
+  end_tag = TagBytes(field_number, wire_format.WIRETYPE_END_GROUP)
+  assert not is_packed
+  if is_repeated:
+    def EncodeRepeatedField(write, value, deterministic):
+      for element in value:
+        write(start_tag)
+        element._InternalSerialize(write, deterministic)
+        write(end_tag)
+    return EncodeRepeatedField
+  else:
+    def EncodeField(write, value, deterministic):
+      write(start_tag)
+      value._InternalSerialize(write, deterministic)
+      return write(end_tag)
+    return EncodeField
+
+
+def MessageEncoder(field_number, is_repeated, is_packed):
+  """Returns an encoder for a message field."""
+
+  tag = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
+  local_EncodeVarint = _EncodeVarint
+  assert not is_packed
+  if is_repeated:
+    def EncodeRepeatedField(write, value, deterministic):
+      for element in value:
+        write(tag)
+        local_EncodeVarint(write, element.ByteSize(), deterministic)
+        element._InternalSerialize(write, deterministic)
+    return EncodeRepeatedField
+  else:
+    def EncodeField(write, value, deterministic):
+      write(tag)
+      local_EncodeVarint(write, value.ByteSize(), deterministic)
+      return value._InternalSerialize(write, deterministic)
+    return EncodeField
+
+
+# --------------------------------------------------------------------
+# As before, MessageSet is special.
+
+
+def MessageSetItemEncoder(field_number):
+  """Encoder for extensions of MessageSet.
+
+  The message set message looks like this:
+    message MessageSet {
+      repeated group Item = 1 {
+        required int32 type_id = 2;
+        required string message = 3;
+      }
+    }
+  """
+  start_bytes = b"".join([
+      TagBytes(1, wire_format.WIRETYPE_START_GROUP),
+      TagBytes(2, wire_format.WIRETYPE_VARINT),
+      _VarintBytes(field_number),
+      TagBytes(3, wire_format.WIRETYPE_LENGTH_DELIMITED)])
+  end_bytes = TagBytes(1, wire_format.WIRETYPE_END_GROUP)
+  local_EncodeVarint = _EncodeVarint
+
+  def EncodeField(write, value, deterministic):
+    write(start_bytes)
+    local_EncodeVarint(write, value.ByteSize(), deterministic)
+    value._InternalSerialize(write, deterministic)
+    return write(end_bytes)
+
+  return EncodeField
+
+
+# --------------------------------------------------------------------
+# As before, Map is special.
+
+
+def MapEncoder(field_descriptor):
+  """Encoder for extensions of MessageSet.
+
+  Maps always have a wire format like this:
+    message MapEntry {
+      key_type key = 1;
+      value_type value = 2;
+    }
+    repeated MapEntry map = N;
+  """
+  # Can't look at field_descriptor.message_type._concrete_class because it may
+  # not have been initialized yet.
+  message_type = field_descriptor.message_type
+  encode_message = MessageEncoder(field_descriptor.number, False, False)
+
+  def EncodeField(write, value, deterministic):
+    value_keys = sorted(value.keys()) if deterministic else value
+    for key in value_keys:
+      entry_msg = message_type._concrete_class(key=key, value=value[key])
+      encode_message(write, entry_msg, deterministic)
+
+  return EncodeField

lib/protobuf/internal/enum_type_wrapper.py

@@ -0,0 +1,124 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""A simple wrapper around enum types to expose utility functions.
+
+Instances are created as properties with the same name as the enum they wrap
+on proto classes.  For usage, see:
+  reflection_test.py
+"""
+
+__author__ = 'rabsatt@google.com (Kevin Rabsatt)'
+
+
+class EnumTypeWrapper(object):
+  """A utility for finding the names of enum values."""
+
+  DESCRIPTOR = None
+
+  # This is a type alias, which mypy typing stubs can type as
+  # a genericized parameter constrained to an int, allowing subclasses
+  # to be typed with more constraint in .pyi stubs
+  # Eg.
+  # def MyGeneratedEnum(Message):
+  #   ValueType = NewType('ValueType', int)
+  #   def Name(self, number: MyGeneratedEnum.ValueType) -> str
+  ValueType = int
+
+  def __init__(self, enum_type):
+    """Inits EnumTypeWrapper with an EnumDescriptor."""
+    self._enum_type = enum_type
+    self.DESCRIPTOR = enum_type  # pylint: disable=invalid-name
+
+  def Name(self, number):  # pylint: disable=invalid-name
+    """Returns a string containing the name of an enum value."""
+    try:
+      return self._enum_type.values_by_number[number].name
+    except KeyError:
+      pass  # fall out to break exception chaining
+
+    if not isinstance(number, int):
+      raise TypeError(
+          'Enum value for {} must be an int, but got {} {!r}.'.format(
+              self._enum_type.name, type(number), number))
+    else:
+      # repr here to handle the odd case when you pass in a boolean.
+      raise ValueError('Enum {} has no name defined for value {!r}'.format(
+          self._enum_type.name, number))
+
+  def Value(self, name):  # pylint: disable=invalid-name
+    """Returns the value corresponding to the given enum name."""
+    try:
+      return self._enum_type.values_by_name[name].number
+    except KeyError:
+      pass  # fall out to break exception chaining
+    raise ValueError('Enum {} has no value defined for name {!r}'.format(
+        self._enum_type.name, name))
+
+  def keys(self):
+    """Return a list of the string names in the enum.
+
+    Returns:
+      A list of strs, in the order they were defined in the .proto file.
+    """
+
+    return [value_descriptor.name
+            for value_descriptor in self._enum_type.values]
+
+  def values(self):
+    """Return a list of the integer values in the enum.
+
+    Returns:
+      A list of ints, in the order they were defined in the .proto file.
+    """
+
+    return [value_descriptor.number
+            for value_descriptor in self._enum_type.values]
+
+  def items(self):
+    """Return a list of the (name, value) pairs of the enum.
+
+    Returns:
+      A list of (str, int) pairs, in the order they were defined
+      in the .proto file.
+    """
+    return [(value_descriptor.name, value_descriptor.number)
+            for value_descriptor in self._enum_type.values]
+
+  def __getattr__(self, name):
+    """Returns the value corresponding to the given enum name."""
+    try:
+      return super(
+          EnumTypeWrapper,
+          self).__getattribute__('_enum_type').values_by_name[name].number
+    except KeyError:
+      pass  # fall out to break exception chaining
+    raise AttributeError('Enum {} has no value defined for name {!r}'.format(
+        self._enum_type.name, name))

lib/protobuf/internal/extension_dict.py

@@ -0,0 +1,213 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Contains _ExtensionDict class to represent extensions.
+"""
+
+from google.protobuf.internal import type_checkers
+from google.protobuf.descriptor import FieldDescriptor
+
+
+def _VerifyExtensionHandle(message, extension_handle):
+  """Verify that the given extension handle is valid."""
+
+  if not isinstance(extension_handle, FieldDescriptor):
+    raise KeyError('HasExtension() expects an extension handle, got: %s' %
+                   extension_handle)
+
+  if not extension_handle.is_extension:
+    raise KeyError('"%s" is not an extension.' % extension_handle.full_name)
+
+  if not extension_handle.containing_type:
+    raise KeyError('"%s" is missing a containing_type.'
+                   % extension_handle.full_name)
+
+  if extension_handle.containing_type is not message.DESCRIPTOR:
+    raise KeyError('Extension "%s" extends message type "%s", but this '
+                   'message is of type "%s".' %
+                   (extension_handle.full_name,
+                    extension_handle.containing_type.full_name,
+                    message.DESCRIPTOR.full_name))
+
+
+# TODO(robinson): Unify error handling of "unknown extension" crap.
+# TODO(robinson): Support iteritems()-style iteration over all
+# extensions with the "has" bits turned on?
+class _ExtensionDict(object):
+
+  """Dict-like container for Extension fields on proto instances.
+
+  Note that in all cases we expect extension handles to be
+  FieldDescriptors.
+  """
+
+  def __init__(self, extended_message):
+    """
+    Args:
+      extended_message: Message instance for which we are the Extensions dict.
+    """
+    self._extended_message = extended_message
+
+  def __getitem__(self, extension_handle):
+    """Returns the current value of the given extension handle."""
+
+    _VerifyExtensionHandle(self._extended_message, extension_handle)
+
+    result = self._extended_message._fields.get(extension_handle)
+    if result is not None:
+      return result
+
+    if extension_handle.label == FieldDescriptor.LABEL_REPEATED:
+      result = extension_handle._default_constructor(self._extended_message)
+    elif extension_handle.cpp_type == FieldDescriptor.CPPTYPE_MESSAGE:
+      message_type = extension_handle.message_type
+      if not hasattr(message_type, '_concrete_class'):
+        # pylint: disable=protected-access
+        self._extended_message._FACTORY.GetPrototype(message_type)
+      assert getattr(extension_handle.message_type, '_concrete_class', None), (
+          'Uninitialized concrete class found for field %r (message type %r)'
+          % (extension_handle.full_name,
+             extension_handle.message_type.full_name))
+      result = extension_handle.message_type._concrete_class()
+      try:
+        result._SetListener(self._extended_message._listener_for_children)
+      except ReferenceError:
+        pass
+    else:
+      # Singular scalar -- just return the default without inserting into the
+      # dict.
+      return extension_handle.default_value
+
+    # Atomically check if another thread has preempted us and, if not, swap
+    # in the new object we just created.  If someone has preempted us, we
+    # take that object and discard ours.
+    # WARNING:  We are relying on setdefault() being atomic.  This is true
+    #   in CPython but we haven't investigated others.  This warning appears
+    #   in several other locations in this file.
+    result = self._extended_message._fields.setdefault(
+        extension_handle, result)
+
+    return result
+
+  def __eq__(self, other):
+    if not isinstance(other, self.__class__):
+      return False
+
+    my_fields = self._extended_message.ListFields()
+    other_fields = other._extended_message.ListFields()
+
+    # Get rid of non-extension fields.
+    my_fields = [field for field in my_fields if field.is_extension]
+    other_fields = [field for field in other_fields if field.is_extension]
+
+    return my_fields == other_fields
+
+  def __ne__(self, other):
+    return not self == other
+
+  def __len__(self):
+    fields = self._extended_message.ListFields()
+    # Get rid of non-extension fields.
+    extension_fields = [field for field in fields if field[0].is_extension]
+    return len(extension_fields)
+
+  def __hash__(self):
+    raise TypeError('unhashable object')
+
+  # Note that this is only meaningful for non-repeated, scalar extension
+  # fields.  Note also that we may have to call _Modified() when we do
+  # successfully set a field this way, to set any necessary "has" bits in the
+  # ancestors of the extended message.
+  def __setitem__(self, extension_handle, value):
+    """If extension_handle specifies a non-repeated, scalar extension
+    field, sets the value of that field.
+    """
+
+    _VerifyExtensionHandle(self._extended_message, extension_handle)
+
+    if (extension_handle.label == FieldDescriptor.LABEL_REPEATED or
+        extension_handle.cpp_type == FieldDescriptor.CPPTYPE_MESSAGE):
+      raise TypeError(
+          'Cannot assign to extension "%s" because it is a repeated or '
+          'composite type.' % extension_handle.full_name)
+
+    # It's slightly wasteful to lookup the type checker each time,
+    # but we expect this to be a vanishingly uncommon case anyway.
+    type_checker = type_checkers.GetTypeChecker(extension_handle)
+    # pylint: disable=protected-access
+    self._extended_message._fields[extension_handle] = (
+        type_checker.CheckValue(value))
+    self._extended_message._Modified()
+
+  def __delitem__(self, extension_handle):
+    self._extended_message.ClearExtension(extension_handle)
+
+  def _FindExtensionByName(self, name):
+    """Tries to find a known extension with the specified name.
+
+    Args:
+      name: Extension full name.
+
+    Returns:
+      Extension field descriptor.
+    """
+    return self._extended_message._extensions_by_name.get(name, None)
+
+  def _FindExtensionByNumber(self, number):
+    """Tries to find a known extension with the field number.
+
+    Args:
+      number: Extension field number.
+
+    Returns:
+      Extension field descriptor.
+    """
+    return self._extended_message._extensions_by_number.get(number, None)
+
+  def __iter__(self):
+    # Return a generator over the populated extension fields
+    return (f[0] for f in self._extended_message.ListFields()
+            if f[0].is_extension)
+
+  def __contains__(self, extension_handle):
+    _VerifyExtensionHandle(self._extended_message, extension_handle)
+
+    if extension_handle not in self._extended_message._fields:
+      return False
+
+    if extension_handle.label == FieldDescriptor.LABEL_REPEATED:
+      return bool(self._extended_message._fields.get(extension_handle))
+
+    if extension_handle.cpp_type == FieldDescriptor.CPPTYPE_MESSAGE:
+      value = self._extended_message._fields.get(extension_handle)
+      # pylint: disable=protected-access
+      return value is not None and value._is_present_in_parent
+
+    return True

lib/protobuf/internal/message_listener.py

@@ -0,0 +1,78 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Defines a listener interface for observing certain
+state transitions on Message objects.
+
+Also defines a null implementation of this interface.
+"""
+
+__author__ = 'robinson@google.com (Will Robinson)'
+
+
+class MessageListener(object):
+
+  """Listens for modifications made to a message.  Meant to be registered via
+  Message._SetListener().
+
+  Attributes:
+    dirty:  If True, then calling Modified() would be a no-op.  This can be
+            used to avoid these calls entirely in the common case.
+  """
+
+  def Modified(self):
+    """Called every time the message is modified in such a way that the parent
+    message may need to be updated.  This currently means either:
+    (a) The message was modified for the first time, so the parent message
+        should henceforth mark the message as present.
+    (b) The message's cached byte size became dirty -- i.e. the message was
+        modified for the first time after a previous call to ByteSize().
+        Therefore the parent should also mark its byte size as dirty.
+    Note that (a) implies (b), since new objects start out with a client cached
+    size (zero).  However, we document (a) explicitly because it is important.
+
+    Modified() will *only* be called in response to one of these two events --
+    not every time the sub-message is modified.
+
+    Note that if the listener's |dirty| attribute is true, then calling
+    Modified at the moment would be a no-op, so it can be skipped.  Performance-
+    sensitive callers should check this attribute directly before calling since
+    it will be true most of the time.
+    """
+
+    raise NotImplementedError
+
+
+class NullMessageListener(object):
+
+  """No-op MessageListener implementation."""
+
+  def Modified(self):
+    pass

lib/protobuf/internal/type_checkers.py

@@ -0,0 +1,435 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Provides type checking routines.
+
+This module defines type checking utilities in the forms of dictionaries:
+
+VALUE_CHECKERS: A dictionary of field types and a value validation object.
+TYPE_TO_BYTE_SIZE_FN: A dictionary with field types and a size computing
+  function.
+TYPE_TO_SERIALIZE_METHOD: A dictionary with field types and serialization
+  function.
+FIELD_TYPE_TO_WIRE_TYPE: A dictionary with field typed and their
+  corresponding wire types.
+TYPE_TO_DESERIALIZE_METHOD: A dictionary with field types and deserialization
+  function.
+"""
+
+__author__ = 'robinson@google.com (Will Robinson)'
+
+import ctypes
+import numbers
+
+from google.protobuf.internal import decoder
+from google.protobuf.internal import encoder
+from google.protobuf.internal import wire_format
+from google.protobuf import descriptor
+
+_FieldDescriptor = descriptor.FieldDescriptor
+
+
+def TruncateToFourByteFloat(original):
+  return ctypes.c_float(original).value
+
+
+def ToShortestFloat(original):
+  """Returns the shortest float that has same value in wire."""
+  # All 4 byte floats have between 6 and 9 significant digits, so we
+  # start with 6 as the lower bound.
+  # It has to be iterative because use '.9g' directly can not get rid
+  # of the noises for most values. For example if set a float_field=0.9
+  # use '.9g' will print 0.899999976.
+  precision = 6
+  rounded = float('{0:.{1}g}'.format(original, precision))
+  while TruncateToFourByteFloat(rounded) != original:
+    precision += 1
+    rounded = float('{0:.{1}g}'.format(original, precision))
+  return rounded
+
+
+def SupportsOpenEnums(field_descriptor):
+  return field_descriptor.containing_type.syntax == 'proto3'
+
+
+def GetTypeChecker(field):
+  """Returns a type checker for a message field of the specified types.
+
+  Args:
+    field: FieldDescriptor object for this field.
+
+  Returns:
+    An instance of TypeChecker which can be used to verify the types
+    of values assigned to a field of the specified type.
+  """
+  if (field.cpp_type == _FieldDescriptor.CPPTYPE_STRING and
+      field.type == _FieldDescriptor.TYPE_STRING):
+    return UnicodeValueChecker()
+  if field.cpp_type == _FieldDescriptor.CPPTYPE_ENUM:
+    if SupportsOpenEnums(field):
+      # When open enums are supported, any int32 can be assigned.
+      return _VALUE_CHECKERS[_FieldDescriptor.CPPTYPE_INT32]
+    else:
+      return EnumValueChecker(field.enum_type)
+  return _VALUE_CHECKERS[field.cpp_type]
+
+
+# None of the typecheckers below make any attempt to guard against people
+# subclassing builtin types and doing weird things.  We're not trying to
+# protect against malicious clients here, just people accidentally shooting
+# themselves in the foot in obvious ways.
+class TypeChecker(object):
+
+  """Type checker used to catch type errors as early as possible
+  when the client is setting scalar fields in protocol messages.
+  """
+
+  def __init__(self, *acceptable_types):
+    self._acceptable_types = acceptable_types
+
+  def CheckValue(self, proposed_value):
+    """Type check the provided value and return it.
+
+    The returned value might have been normalized to another type.
+    """
+    if not isinstance(proposed_value, self._acceptable_types):
+      message = ('%.1024r has type %s, but expected one of: %s' %
+                 (proposed_value, type(proposed_value), self._acceptable_types))
+      raise TypeError(message)
+    return proposed_value
+
+
+class TypeCheckerWithDefault(TypeChecker):
+
+  def __init__(self, default_value, *acceptable_types):
+    TypeChecker.__init__(self, *acceptable_types)
+    self._default_value = default_value
+
+  def DefaultValue(self):
+    return self._default_value
+
+
+class BoolValueChecker(object):
+  """Type checker used for bool fields."""
+
+  def CheckValue(self, proposed_value):
+    if not hasattr(proposed_value, '__index__') or (
+        type(proposed_value).__module__ == 'numpy' and
+        type(proposed_value).__name__ == 'ndarray'):
+      message = ('%.1024r has type %s, but expected one of: %s' %
+                 (proposed_value, type(proposed_value), (bool, int)))
+      raise TypeError(message)
+    return bool(proposed_value)
+
+  def DefaultValue(self):
+    return False
+
+
+# IntValueChecker and its subclasses perform integer type-checks
+# and bounds-checks.
+class IntValueChecker(object):
+
+  """Checker used for integer fields.  Performs type-check and range check."""
+
+  def CheckValue(self, proposed_value):
+    if not hasattr(proposed_value, '__index__') or (
+        type(proposed_value).__module__ == 'numpy' and
+        type(proposed_value).__name__ == 'ndarray'):
+      message = ('%.1024r has type %s, but expected one of: %s' %
+                 (proposed_value, type(proposed_value), (int,)))
+      raise TypeError(message)
+
+    if not self._MIN <= int(proposed_value) <= self._MAX:
+      raise ValueError('Value out of range: %d' % proposed_value)
+    # We force all values to int to make alternate implementations where the
+    # distinction is more significant (e.g. the C++ implementation) simpler.
+    proposed_value = int(proposed_value)
+    return proposed_value
+
+  def DefaultValue(self):
+    return 0
+
+
+class EnumValueChecker(object):
+
+  """Checker used for enum fields.  Performs type-check and range check."""
+
+  def __init__(self, enum_type):
+    self._enum_type = enum_type
+
+  def CheckValue(self, proposed_value):
+    if not isinstance(proposed_value, numbers.Integral):
+      message = ('%.1024r has type %s, but expected one of: %s' %
+                 (proposed_value, type(proposed_value), (int,)))
+      raise TypeError(message)
+    if int(proposed_value) not in self._enum_type.values_by_number:
+      raise ValueError('Unknown enum value: %d' % proposed_value)
+    return proposed_value
+
+  def DefaultValue(self):
+    return self._enum_type.values[0].number
+
+
+class UnicodeValueChecker(object):
+
+  """Checker used for string fields.
+
+  Always returns a unicode value, even if the input is of type str.
+  """
+
+  def CheckValue(self, proposed_value):
+    if not isinstance(proposed_value, (bytes, str)):
+      message = ('%.1024r has type %s, but expected one of: %s' %
+                 (proposed_value, type(proposed_value), (bytes, str)))
+      raise TypeError(message)
+
+    # If the value is of type 'bytes' make sure that it is valid UTF-8 data.
+    if isinstance(proposed_value, bytes):
+      try:
+        proposed_value = proposed_value.decode('utf-8')
+      except UnicodeDecodeError:
+        raise ValueError('%.1024r has type bytes, but isn\'t valid UTF-8 '
+                         'encoding. Non-UTF-8 strings must be converted to '
+                         'unicode objects before being added.' %
+                         (proposed_value))
+    else:
+      try:
+        proposed_value.encode('utf8')
+      except UnicodeEncodeError:
+        raise ValueError('%.1024r isn\'t a valid unicode string and '
+                         'can\'t be encoded in UTF-8.'%
+                         (proposed_value))
+
+    return proposed_value
+
+  def DefaultValue(self):
+    return u""
+
+
+class Int32ValueChecker(IntValueChecker):
+  # We're sure to use ints instead of longs here since comparison may be more
+  # efficient.
+  _MIN = -2147483648
+  _MAX = 2147483647
+
+
+class Uint32ValueChecker(IntValueChecker):
+  _MIN = 0
+  _MAX = (1 << 32) - 1
+
+
+class Int64ValueChecker(IntValueChecker):
+  _MIN = -(1 << 63)
+  _MAX = (1 << 63) - 1
+
+
+class Uint64ValueChecker(IntValueChecker):
+  _MIN = 0
+  _MAX = (1 << 64) - 1
+
+
+# The max 4 bytes float is about 3.4028234663852886e+38
+_FLOAT_MAX = float.fromhex('0x1.fffffep+127')
+_FLOAT_MIN = -_FLOAT_MAX
+_INF = float('inf')
+_NEG_INF = float('-inf')
+
+
+class DoubleValueChecker(object):
+  """Checker used for double fields.
+
+  Performs type-check and range check.
+  """
+
+  def CheckValue(self, proposed_value):
+    """Check and convert proposed_value to float."""
+    if (not hasattr(proposed_value, '__float__') and
+        not hasattr(proposed_value, '__index__')) or (
+            type(proposed_value).__module__ == 'numpy' and
+            type(proposed_value).__name__ == 'ndarray'):
+      message = ('%.1024r has type %s, but expected one of: int, float' %
+                 (proposed_value, type(proposed_value)))
+      raise TypeError(message)
+    return float(proposed_value)
+
+  def DefaultValue(self):
+    return 0.0
+
+
+class FloatValueChecker(DoubleValueChecker):
+  """Checker used for float fields.
+
+  Performs type-check and range check.
+
+  Values exceeding a 32-bit float will be converted to inf/-inf.
+  """
+
+  def CheckValue(self, proposed_value):
+    """Check and convert proposed_value to float."""
+    converted_value = super().CheckValue(proposed_value)
+    # This inf rounding matches the C++ proto SafeDoubleToFloat logic.
+    if converted_value > _FLOAT_MAX:
+      return _INF
+    if converted_value < _FLOAT_MIN:
+      return _NEG_INF
+
+    return TruncateToFourByteFloat(converted_value)
+
+# Type-checkers for all scalar CPPTYPEs.
+_VALUE_CHECKERS = {
+    _FieldDescriptor.CPPTYPE_INT32: Int32ValueChecker(),
+    _FieldDescriptor.CPPTYPE_INT64: Int64ValueChecker(),
+    _FieldDescriptor.CPPTYPE_UINT32: Uint32ValueChecker(),
+    _FieldDescriptor.CPPTYPE_UINT64: Uint64ValueChecker(),
+    _FieldDescriptor.CPPTYPE_DOUBLE: DoubleValueChecker(),
+    _FieldDescriptor.CPPTYPE_FLOAT: FloatValueChecker(),
+    _FieldDescriptor.CPPTYPE_BOOL: BoolValueChecker(),
+    _FieldDescriptor.CPPTYPE_STRING: TypeCheckerWithDefault(b'', bytes),
+}
+
+
+# Map from field type to a function F, such that F(field_num, value)
+# gives the total byte size for a value of the given type.  This
+# byte size includes tag information and any other additional space
+# associated with serializing "value".
+TYPE_TO_BYTE_SIZE_FN = {
+    _FieldDescriptor.TYPE_DOUBLE: wire_format.DoubleByteSize,
+    _FieldDescriptor.TYPE_FLOAT: wire_format.FloatByteSize,
+    _FieldDescriptor.TYPE_INT64: wire_format.Int64ByteSize,
+    _FieldDescriptor.TYPE_UINT64: wire_format.UInt64ByteSize,
+    _FieldDescriptor.TYPE_INT32: wire_format.Int32ByteSize,
+    _FieldDescriptor.TYPE_FIXED64: wire_format.Fixed64ByteSize,
+    _FieldDescriptor.TYPE_FIXED32: wire_format.Fixed32ByteSize,
+    _FieldDescriptor.TYPE_BOOL: wire_format.BoolByteSize,
+    _FieldDescriptor.TYPE_STRING: wire_format.StringByteSize,
+    _FieldDescriptor.TYPE_GROUP: wire_format.GroupByteSize,
+    _FieldDescriptor.TYPE_MESSAGE: wire_format.MessageByteSize,
+    _FieldDescriptor.TYPE_BYTES: wire_format.BytesByteSize,
+    _FieldDescriptor.TYPE_UINT32: wire_format.UInt32ByteSize,
+    _FieldDescriptor.TYPE_ENUM: wire_format.EnumByteSize,
+    _FieldDescriptor.TYPE_SFIXED32: wire_format.SFixed32ByteSize,
+    _FieldDescriptor.TYPE_SFIXED64: wire_format.SFixed64ByteSize,
+    _FieldDescriptor.TYPE_SINT32: wire_format.SInt32ByteSize,
+    _FieldDescriptor.TYPE_SINT64: wire_format.SInt64ByteSize
+    }
+
+
+# Maps from field types to encoder constructors.
+TYPE_TO_ENCODER = {
+    _FieldDescriptor.TYPE_DOUBLE: encoder.DoubleEncoder,
+    _FieldDescriptor.TYPE_FLOAT: encoder.FloatEncoder,
+    _FieldDescriptor.TYPE_INT64: encoder.Int64Encoder,
+    _FieldDescriptor.TYPE_UINT64: encoder.UInt64Encoder,
+    _FieldDescriptor.TYPE_INT32: encoder.Int32Encoder,
+    _FieldDescriptor.TYPE_FIXED64: encoder.Fixed64Encoder,
+    _FieldDescriptor.TYPE_FIXED32: encoder.Fixed32Encoder,
+    _FieldDescriptor.TYPE_BOOL: encoder.BoolEncoder,
+    _FieldDescriptor.TYPE_STRING: encoder.StringEncoder,
+    _FieldDescriptor.TYPE_GROUP: encoder.GroupEncoder,
+    _FieldDescriptor.TYPE_MESSAGE: encoder.MessageEncoder,
+    _FieldDescriptor.TYPE_BYTES: encoder.BytesEncoder,
+    _FieldDescriptor.TYPE_UINT32: encoder.UInt32Encoder,
+    _FieldDescriptor.TYPE_ENUM: encoder.EnumEncoder,
+    _FieldDescriptor.TYPE_SFIXED32: encoder.SFixed32Encoder,
+    _FieldDescriptor.TYPE_SFIXED64: encoder.SFixed64Encoder,
+    _FieldDescriptor.TYPE_SINT32: encoder.SInt32Encoder,
+    _FieldDescriptor.TYPE_SINT64: encoder.SInt64Encoder,
+    }
+
+
+# Maps from field types to sizer constructors.
+TYPE_TO_SIZER = {
+    _FieldDescriptor.TYPE_DOUBLE: encoder.DoubleSizer,
+    _FieldDescriptor.TYPE_FLOAT: encoder.FloatSizer,
+    _FieldDescriptor.TYPE_INT64: encoder.Int64Sizer,
+    _FieldDescriptor.TYPE_UINT64: encoder.UInt64Sizer,
+    _FieldDescriptor.TYPE_INT32: encoder.Int32Sizer,
+    _FieldDescriptor.TYPE_FIXED64: encoder.Fixed64Sizer,
+    _FieldDescriptor.TYPE_FIXED32: encoder.Fixed32Sizer,
+    _FieldDescriptor.TYPE_BOOL: encoder.BoolSizer,
+    _FieldDescriptor.TYPE_STRING: encoder.StringSizer,
+    _FieldDescriptor.TYPE_GROUP: encoder.GroupSizer,
+    _FieldDescriptor.TYPE_MESSAGE: encoder.MessageSizer,
+    _FieldDescriptor.TYPE_BYTES: encoder.BytesSizer,
+    _FieldDescriptor.TYPE_UINT32: encoder.UInt32Sizer,
+    _FieldDescriptor.TYPE_ENUM: encoder.EnumSizer,
+    _FieldDescriptor.TYPE_SFIXED32: encoder.SFixed32Sizer,
+    _FieldDescriptor.TYPE_SFIXED64: encoder.SFixed64Sizer,
+    _FieldDescriptor.TYPE_SINT32: encoder.SInt32Sizer,
+    _FieldDescriptor.TYPE_SINT64: encoder.SInt64Sizer,
+    }
+
+
+# Maps from field type to a decoder constructor.
+TYPE_TO_DECODER = {
+    _FieldDescriptor.TYPE_DOUBLE: decoder.DoubleDecoder,
+    _FieldDescriptor.TYPE_FLOAT: decoder.FloatDecoder,
+    _FieldDescriptor.TYPE_INT64: decoder.Int64Decoder,
+    _FieldDescriptor.TYPE_UINT64: decoder.UInt64Decoder,
+    _FieldDescriptor.TYPE_INT32: decoder.Int32Decoder,
+    _FieldDescriptor.TYPE_FIXED64: decoder.Fixed64Decoder,
+    _FieldDescriptor.TYPE_FIXED32: decoder.Fixed32Decoder,
+    _FieldDescriptor.TYPE_BOOL: decoder.BoolDecoder,
+    _FieldDescriptor.TYPE_STRING: decoder.StringDecoder,
+    _FieldDescriptor.TYPE_GROUP: decoder.GroupDecoder,
+    _FieldDescriptor.TYPE_MESSAGE: decoder.MessageDecoder,
+    _FieldDescriptor.TYPE_BYTES: decoder.BytesDecoder,
+    _FieldDescriptor.TYPE_UINT32: decoder.UInt32Decoder,
+    _FieldDescriptor.TYPE_ENUM: decoder.EnumDecoder,
+    _FieldDescriptor.TYPE_SFIXED32: decoder.SFixed32Decoder,
+    _FieldDescriptor.TYPE_SFIXED64: decoder.SFixed64Decoder,
+    _FieldDescriptor.TYPE_SINT32: decoder.SInt32Decoder,
+    _FieldDescriptor.TYPE_SINT64: decoder.SInt64Decoder,
+    }
+
+# Maps from field type to expected wiretype.
+FIELD_TYPE_TO_WIRE_TYPE = {
+    _FieldDescriptor.TYPE_DOUBLE: wire_format.WIRETYPE_FIXED64,
+    _FieldDescriptor.TYPE_FLOAT: wire_format.WIRETYPE_FIXED32,
+    _FieldDescriptor.TYPE_INT64: wire_format.WIRETYPE_VARINT,
+    _FieldDescriptor.TYPE_UINT64: wire_format.WIRETYPE_VARINT,
+    _FieldDescriptor.TYPE_INT32: wire_format.WIRETYPE_VARINT,
+    _FieldDescriptor.TYPE_FIXED64: wire_format.WIRETYPE_FIXED64,
+    _FieldDescriptor.TYPE_FIXED32: wire_format.WIRETYPE_FIXED32,
+    _FieldDescriptor.TYPE_BOOL: wire_format.WIRETYPE_VARINT,
+    _FieldDescriptor.TYPE_STRING:
+      wire_format.WIRETYPE_LENGTH_DELIMITED,
+    _FieldDescriptor.TYPE_GROUP: wire_format.WIRETYPE_START_GROUP,
+    _FieldDescriptor.TYPE_MESSAGE:
+      wire_format.WIRETYPE_LENGTH_DELIMITED,
+    _FieldDescriptor.TYPE_BYTES:
+      wire_format.WIRETYPE_LENGTH_DELIMITED,
+    _FieldDescriptor.TYPE_UINT32: wire_format.WIRETYPE_VARINT,
+    _FieldDescriptor.TYPE_ENUM: wire_format.WIRETYPE_VARINT,
+    _FieldDescriptor.TYPE_SFIXED32: wire_format.WIRETYPE_FIXED32,
+    _FieldDescriptor.TYPE_SFIXED64: wire_format.WIRETYPE_FIXED64,
+    _FieldDescriptor.TYPE_SINT32: wire_format.WIRETYPE_VARINT,
+    _FieldDescriptor.TYPE_SINT64: wire_format.WIRETYPE_VARINT,
+    }

lib/protobuf/internal/well_known_types.py

@@ -0,0 +1,878 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Contains well known classes.
+
+This files defines well known classes which need extra maintenance including:
+  - Any
+  - Duration
+  - FieldMask
+  - Struct
+  - Timestamp
+"""
+
+__author__ = 'jieluo@google.com (Jie Luo)'
+
+import calendar
+import collections.abc
+import datetime
+
+from google.protobuf.descriptor import FieldDescriptor
+
+_TIMESTAMPFOMAT = '%Y-%m-%dT%H:%M:%S'
+_NANOS_PER_SECOND = 1000000000
+_NANOS_PER_MILLISECOND = 1000000
+_NANOS_PER_MICROSECOND = 1000
+_MILLIS_PER_SECOND = 1000
+_MICROS_PER_SECOND = 1000000
+_SECONDS_PER_DAY = 24 * 3600
+_DURATION_SECONDS_MAX = 315576000000
+
+
+class Any(object):
+  """Class for Any Message type."""
+
+  __slots__ = ()
+
+  def Pack(self, msg, type_url_prefix='type.googleapis.com/',
+           deterministic=None):
+    """Packs the specified message into current Any message."""
+    if len(type_url_prefix) < 1 or type_url_prefix[-1] != '/':
+      self.type_url = '%s/%s' % (type_url_prefix, msg.DESCRIPTOR.full_name)
+    else:
+      self.type_url = '%s%s' % (type_url_prefix, msg.DESCRIPTOR.full_name)
+    self.value = msg.SerializeToString(deterministic=deterministic)
+
+  def Unpack(self, msg):
+    """Unpacks the current Any message into specified message."""
+    descriptor = msg.DESCRIPTOR
+    if not self.Is(descriptor):
+      return False
+    msg.ParseFromString(self.value)
+    return True
+
+  def TypeName(self):
+    """Returns the protobuf type name of the inner message."""
+    # Only last part is to be used: b/25630112
+    return self.type_url.split('/')[-1]
+
+  def Is(self, descriptor):
+    """Checks if this Any represents the given protobuf type."""
+    return '/' in self.type_url and self.TypeName() == descriptor.full_name
+
+
+_EPOCH_DATETIME_NAIVE = datetime.datetime.utcfromtimestamp(0)
+_EPOCH_DATETIME_AWARE = datetime.datetime.fromtimestamp(
+    0, tz=datetime.timezone.utc)
+
+
+class Timestamp(object):
+  """Class for Timestamp message type."""
+
+  __slots__ = ()
+
+  def ToJsonString(self):
+    """Converts Timestamp to RFC 3339 date string format.
+
+    Returns:
+      A string converted from timestamp. The string is always Z-normalized
+      and uses 3, 6 or 9 fractional digits as required to represent the
+      exact time. Example of the return format: '1972-01-01T10:00:20.021Z'
+    """
+    nanos = self.nanos % _NANOS_PER_SECOND
+    total_sec = self.seconds + (self.nanos - nanos) // _NANOS_PER_SECOND
+    seconds = total_sec % _SECONDS_PER_DAY
+    days = (total_sec - seconds) // _SECONDS_PER_DAY
+    dt = datetime.datetime(1970, 1, 1) + datetime.timedelta(days, seconds)
+
+    result = dt.isoformat()
+    if (nanos % 1e9) == 0:
+      # If there are 0 fractional digits, the fractional
+      # point '.' should be omitted when serializing.
+      return result + 'Z'
+    if (nanos % 1e6) == 0:
+      # Serialize 3 fractional digits.
+      return result + '.%03dZ' % (nanos / 1e6)
+    if (nanos % 1e3) == 0:
+      # Serialize 6 fractional digits.
+      return result + '.%06dZ' % (nanos / 1e3)
+    # Serialize 9 fractional digits.
+    return result + '.%09dZ' % nanos
+
+  def FromJsonString(self, value):
+    """Parse a RFC 3339 date string format to Timestamp.
+
+    Args:
+      value: A date string. Any fractional digits (or none) and any offset are
+          accepted as long as they fit into nano-seconds precision.
+          Example of accepted format: '1972-01-01T10:00:20.021-05:00'
+
+    Raises:
+      ValueError: On parsing problems.
+    """
+    if not isinstance(value, str):
+      raise ValueError('Timestamp JSON value not a string: {!r}'.format(value))
+    timezone_offset = value.find('Z')
+    if timezone_offset == -1:
+      timezone_offset = value.find('+')
+    if timezone_offset == -1:
+      timezone_offset = value.rfind('-')
+    if timezone_offset == -1:
+      raise ValueError(
+          'Failed to parse timestamp: missing valid timezone offset.')
+    time_value = value[0:timezone_offset]
+    # Parse datetime and nanos.
+    point_position = time_value.find('.')
+    if point_position == -1:
+      second_value = time_value
+      nano_value = ''
+    else:
+      second_value = time_value[:point_position]
+      nano_value = time_value[point_position + 1:]
+    if 't' in second_value:
+      raise ValueError(
+          'time data \'{0}\' does not match format \'%Y-%m-%dT%H:%M:%S\', '
+          'lowercase \'t\' is not accepted'.format(second_value))
+    date_object = datetime.datetime.strptime(second_value, _TIMESTAMPFOMAT)
+    td = date_object - datetime.datetime(1970, 1, 1)
+    seconds = td.seconds + td.days * _SECONDS_PER_DAY
+    if len(nano_value) > 9:
+      raise ValueError(
+          'Failed to parse Timestamp: nanos {0} more than '
+          '9 fractional digits.'.format(nano_value))
+    if nano_value:
+      nanos = round(float('0.' + nano_value) * 1e9)
+    else:
+      nanos = 0
+    # Parse timezone offsets.
+    if value[timezone_offset] == 'Z':
+      if len(value) != timezone_offset + 1:
+        raise ValueError('Failed to parse timestamp: invalid trailing'
+                         ' data {0}.'.format(value))
+    else:
+      timezone = value[timezone_offset:]
+      pos = timezone.find(':')
+      if pos == -1:
+        raise ValueError(
+            'Invalid timezone offset value: {0}.'.format(timezone))
+      if timezone[0] == '+':
+        seconds -= (int(timezone[1:pos])*60+int(timezone[pos+1:]))*60
+      else:
+        seconds += (int(timezone[1:pos])*60+int(timezone[pos+1:]))*60
+    # Set seconds and nanos
+    self.seconds = int(seconds)
+    self.nanos = int(nanos)
+
+  def GetCurrentTime(self):
+    """Get the current UTC into Timestamp."""
+    self.FromDatetime(datetime.datetime.utcnow())
+
+  def ToNanoseconds(self):
+    """Converts Timestamp to nanoseconds since epoch."""
+    return self.seconds * _NANOS_PER_SECOND + self.nanos
+
+  def ToMicroseconds(self):
+    """Converts Timestamp to microseconds since epoch."""
+    return (self.seconds * _MICROS_PER_SECOND +
+            self.nanos // _NANOS_PER_MICROSECOND)
+
+  def ToMilliseconds(self):
+    """Converts Timestamp to milliseconds since epoch."""
+    return (self.seconds * _MILLIS_PER_SECOND +
+            self.nanos // _NANOS_PER_MILLISECOND)
+
+  def ToSeconds(self):
+    """Converts Timestamp to seconds since epoch."""
+    return self.seconds
+
+  def FromNanoseconds(self, nanos):
+    """Converts nanoseconds since epoch to Timestamp."""
+    self.seconds = nanos // _NANOS_PER_SECOND
+    self.nanos = nanos % _NANOS_PER_SECOND
+
+  def FromMicroseconds(self, micros):
+    """Converts microseconds since epoch to Timestamp."""
+    self.seconds = micros // _MICROS_PER_SECOND
+    self.nanos = (micros % _MICROS_PER_SECOND) * _NANOS_PER_MICROSECOND
+
+  def FromMilliseconds(self, millis):
+    """Converts milliseconds since epoch to Timestamp."""
+    self.seconds = millis // _MILLIS_PER_SECOND
+    self.nanos = (millis % _MILLIS_PER_SECOND) * _NANOS_PER_MILLISECOND
+
+  def FromSeconds(self, seconds):
+    """Converts seconds since epoch to Timestamp."""
+    self.seconds = seconds
+    self.nanos = 0
+
+  def ToDatetime(self, tzinfo=None):
+    """Converts Timestamp to a datetime.
+
+    Args:
+      tzinfo: A datetime.tzinfo subclass; defaults to None.
+
+    Returns:
+      If tzinfo is None, returns a timezone-naive UTC datetime (with no timezone
+      information, i.e. not aware that it's UTC).
+
+      Otherwise, returns a timezone-aware datetime in the input timezone.
+    """
+    delta = datetime.timedelta(
+        seconds=self.seconds,
+        microseconds=_RoundTowardZero(self.nanos, _NANOS_PER_MICROSECOND))
+    if tzinfo is None:
+      return _EPOCH_DATETIME_NAIVE + delta
+    else:
+      return _EPOCH_DATETIME_AWARE.astimezone(tzinfo) + delta
+
+  def FromDatetime(self, dt):
+    """Converts datetime to Timestamp.
+
+    Args:
+      dt: A datetime. If it's timezone-naive, it's assumed to be in UTC.
+    """
+    # Using this guide: http://wiki.python.org/moin/WorkingWithTime
+    # And this conversion guide: http://docs.python.org/library/time.html
+
+    # Turn the date parameter into a tuple (struct_time) that can then be
+    # manipulated into a long value of seconds.  During the conversion from
+    # struct_time to long, the source date in UTC, and so it follows that the
+    # correct transformation is calendar.timegm()
+    self.seconds = calendar.timegm(dt.utctimetuple())
+    self.nanos = dt.microsecond * _NANOS_PER_MICROSECOND
+
+
+class Duration(object):
+  """Class for Duration message type."""
+
+  __slots__ = ()
+
+  def ToJsonString(self):
+    """Converts Duration to string format.
+
+    Returns:
+      A string converted from self. The string format will contains
+      3, 6, or 9 fractional digits depending on the precision required to
+      represent the exact Duration value. For example: "1s", "1.010s",
+      "1.000000100s", "-3.100s"
+    """
+    _CheckDurationValid(self.seconds, self.nanos)
+    if self.seconds < 0 or self.nanos < 0:
+      result = '-'
+      seconds = - self.seconds + int((0 - self.nanos) // 1e9)
+      nanos = (0 - self.nanos) % 1e9
+    else:
+      result = ''
+      seconds = self.seconds + int(self.nanos // 1e9)
+      nanos = self.nanos % 1e9
+    result += '%d' % seconds
+    if (nanos % 1e9) == 0:
+      # If there are 0 fractional digits, the fractional
+      # point '.' should be omitted when serializing.
+      return result + 's'
+    if (nanos % 1e6) == 0:
+      # Serialize 3 fractional digits.
+      return result + '.%03ds' % (nanos / 1e6)
+    if (nanos % 1e3) == 0:
+      # Serialize 6 fractional digits.
+      return result + '.%06ds' % (nanos / 1e3)
+    # Serialize 9 fractional digits.
+    return result + '.%09ds' % nanos
+
+  def FromJsonString(self, value):
+    """Converts a string to Duration.
+
+    Args:
+      value: A string to be converted. The string must end with 's'. Any
+          fractional digits (or none) are accepted as long as they fit into
+          precision. For example: "1s", "1.01s", "1.0000001s", "-3.100s
+
+    Raises:
+      ValueError: On parsing problems.
+    """
+    if not isinstance(value, str):
+      raise ValueError('Duration JSON value not a string: {!r}'.format(value))
+    if len(value) < 1 or value[-1] != 's':
+      raise ValueError(
+          'Duration must end with letter "s": {0}.'.format(value))
+    try:
+      pos = value.find('.')
+      if pos == -1:
+        seconds = int(value[:-1])
+        nanos = 0
+      else:
+        seconds = int(value[:pos])
+        if value[0] == '-':
+          nanos = int(round(float('-0{0}'.format(value[pos: -1])) *1e9))
+        else:
+          nanos = int(round(float('0{0}'.format(value[pos: -1])) *1e9))
+      _CheckDurationValid(seconds, nanos)
+      self.seconds = seconds
+      self.nanos = nanos
+    except ValueError as e:
+      raise ValueError(
+          'Couldn\'t parse duration: {0} : {1}.'.format(value, e))
+
+  def ToNanoseconds(self):
+    """Converts a Duration to nanoseconds."""
+    return self.seconds * _NANOS_PER_SECOND + self.nanos
+
+  def ToMicroseconds(self):
+    """Converts a Duration to microseconds."""
+    micros = _RoundTowardZero(self.nanos, _NANOS_PER_MICROSECOND)
+    return self.seconds * _MICROS_PER_SECOND + micros
+
+  def ToMilliseconds(self):
+    """Converts a Duration to milliseconds."""
+    millis = _RoundTowardZero(self.nanos, _NANOS_PER_MILLISECOND)
+    return self.seconds * _MILLIS_PER_SECOND + millis
+
+  def ToSeconds(self):
+    """Converts a Duration to seconds."""
+    return self.seconds
+
+  def FromNanoseconds(self, nanos):
+    """Converts nanoseconds to Duration."""
+    self._NormalizeDuration(nanos // _NANOS_PER_SECOND,
+                            nanos % _NANOS_PER_SECOND)
+
+  def FromMicroseconds(self, micros):
+    """Converts microseconds to Duration."""
+    self._NormalizeDuration(
+        micros // _MICROS_PER_SECOND,
+        (micros % _MICROS_PER_SECOND) * _NANOS_PER_MICROSECOND)
+
+  def FromMilliseconds(self, millis):
+    """Converts milliseconds to Duration."""
+    self._NormalizeDuration(
+        millis // _MILLIS_PER_SECOND,
+        (millis % _MILLIS_PER_SECOND) * _NANOS_PER_MILLISECOND)
+
+  def FromSeconds(self, seconds):
+    """Converts seconds to Duration."""
+    self.seconds = seconds
+    self.nanos = 0
+
+  def ToTimedelta(self):
+    """Converts Duration to timedelta."""
+    return datetime.timedelta(
+        seconds=self.seconds, microseconds=_RoundTowardZero(
+            self.nanos, _NANOS_PER_MICROSECOND))
+
+  def FromTimedelta(self, td):
+    """Converts timedelta to Duration."""
+    self._NormalizeDuration(td.seconds + td.days * _SECONDS_PER_DAY,
+                            td.microseconds * _NANOS_PER_MICROSECOND)
+
+  def _NormalizeDuration(self, seconds, nanos):
+    """Set Duration by seconds and nanos."""
+    # Force nanos to be negative if the duration is negative.
+    if seconds < 0 and nanos > 0:
+      seconds += 1
+      nanos -= _NANOS_PER_SECOND
+    self.seconds = seconds
+    self.nanos = nanos
+
+
+def _CheckDurationValid(seconds, nanos):
+  if seconds < -_DURATION_SECONDS_MAX or seconds > _DURATION_SECONDS_MAX:
+    raise ValueError(
+        'Duration is not valid: Seconds {0} must be in range '
+        '[-315576000000, 315576000000].'.format(seconds))
+  if nanos <= -_NANOS_PER_SECOND or nanos >= _NANOS_PER_SECOND:
+    raise ValueError(
+        'Duration is not valid: Nanos {0} must be in range '
+        '[-999999999, 999999999].'.format(nanos))
+  if (nanos < 0 and seconds > 0) or (nanos > 0 and seconds < 0):
+    raise ValueError(
+        'Duration is not valid: Sign mismatch.')
+
+
+def _RoundTowardZero(value, divider):
+  """Truncates the remainder part after division."""
+  # For some languages, the sign of the remainder is implementation
+  # dependent if any of the operands is negative. Here we enforce
+  # "rounded toward zero" semantics. For example, for (-5) / 2 an
+  # implementation may give -3 as the result with the remainder being
+  # 1. This function ensures we always return -2 (closer to zero).
+  result = value // divider
+  remainder = value % divider
+  if result < 0 and remainder > 0:
+    return result + 1
+  else:
+    return result
+
+
+class FieldMask(object):
+  """Class for FieldMask message type."""
+
+  __slots__ = ()
+
+  def ToJsonString(self):
+    """Converts FieldMask to string according to proto3 JSON spec."""
+    camelcase_paths = []
+    for path in self.paths:
+      camelcase_paths.append(_SnakeCaseToCamelCase(path))
+    return ','.join(camelcase_paths)
+
+  def FromJsonString(self, value):
+    """Converts string to FieldMask according to proto3 JSON spec."""
+    if not isinstance(value, str):
+      raise ValueError('FieldMask JSON value not a string: {!r}'.format(value))
+    self.Clear()
+    if value:
+      for path in value.split(','):
+        self.paths.append(_CamelCaseToSnakeCase(path))
+
+  def IsValidForDescriptor(self, message_descriptor):
+    """Checks whether the FieldMask is valid for Message Descriptor."""
+    for path in self.paths:
+      if not _IsValidPath(message_descriptor, path):
+        return False
+    return True
+
+  def AllFieldsFromDescriptor(self, message_descriptor):
+    """Gets all direct fields of Message Descriptor to FieldMask."""
+    self.Clear()
+    for field in message_descriptor.fields:
+      self.paths.append(field.name)
+
+  def CanonicalFormFromMask(self, mask):
+    """Converts a FieldMask to the canonical form.
+
+    Removes paths that are covered by another path. For example,
+    "foo.bar" is covered by "foo" and will be removed if "foo"
+    is also in the FieldMask. Then sorts all paths in alphabetical order.
+
+    Args:
+      mask: The original FieldMask to be converted.
+    """
+    tree = _FieldMaskTree(mask)
+    tree.ToFieldMask(self)
+
+  def Union(self, mask1, mask2):
+    """Merges mask1 and mask2 into this FieldMask."""
+    _CheckFieldMaskMessage(mask1)
+    _CheckFieldMaskMessage(mask2)
+    tree = _FieldMaskTree(mask1)
+    tree.MergeFromFieldMask(mask2)
+    tree.ToFieldMask(self)
+
+  def Intersect(self, mask1, mask2):
+    """Intersects mask1 and mask2 into this FieldMask."""
+    _CheckFieldMaskMessage(mask1)
+    _CheckFieldMaskMessage(mask2)
+    tree = _FieldMaskTree(mask1)
+    intersection = _FieldMaskTree()
+    for path in mask2.paths:
+      tree.IntersectPath(path, intersection)
+    intersection.ToFieldMask(self)
+
+  def MergeMessage(
+      self, source, destination,
+      replace_message_field=False, replace_repeated_field=False):
+    """Merges fields specified in FieldMask from source to destination.
+
+    Args:
+      source: Source message.
+      destination: The destination message to be merged into.
+      replace_message_field: Replace message field if True. Merge message
+          field if False.
+      replace_repeated_field: Replace repeated field if True. Append
+          elements of repeated field if False.
+    """
+    tree = _FieldMaskTree(self)
+    tree.MergeMessage(
+        source, destination, replace_message_field, replace_repeated_field)
+
+
+def _IsValidPath(message_descriptor, path):
+  """Checks whether the path is valid for Message Descriptor."""
+  parts = path.split('.')
+  last = parts.pop()
+  for name in parts:
+    field = message_descriptor.fields_by_name.get(name)
+    if (field is None or
+        field.label == FieldDescriptor.LABEL_REPEATED or
+        field.type != FieldDescriptor.TYPE_MESSAGE):
+      return False
+    message_descriptor = field.message_type
+  return last in message_descriptor.fields_by_name
+
+
+def _CheckFieldMaskMessage(message):
+  """Raises ValueError if message is not a FieldMask."""
+  message_descriptor = message.DESCRIPTOR
+  if (message_descriptor.name != 'FieldMask' or
+      message_descriptor.file.name != 'google/protobuf/field_mask.proto'):
+    raise ValueError('Message {0} is not a FieldMask.'.format(
+        message_descriptor.full_name))
+
+
+def _SnakeCaseToCamelCase(path_name):
+  """Converts a path name from snake_case to camelCase."""
+  result = []
+  after_underscore = False
+  for c in path_name:
+    if c.isupper():
+      raise ValueError(
+          'Fail to print FieldMask to Json string: Path name '
+          '{0} must not contain uppercase letters.'.format(path_name))
+    if after_underscore:
+      if c.islower():
+        result.append(c.upper())
+        after_underscore = False
+      else:
+        raise ValueError(
+            'Fail to print FieldMask to Json string: The '
+            'character after a "_" must be a lowercase letter '
+            'in path name {0}.'.format(path_name))
+    elif c == '_':
+      after_underscore = True
+    else:
+      result += c
+
+  if after_underscore:
+    raise ValueError('Fail to print FieldMask to Json string: Trailing "_" '
+                     'in path name {0}.'.format(path_name))
+  return ''.join(result)
+
+
+def _CamelCaseToSnakeCase(path_name):
+  """Converts a field name from camelCase to snake_case."""
+  result = []
+  for c in path_name:
+    if c == '_':
+      raise ValueError('Fail to parse FieldMask: Path name '
+                       '{0} must not contain "_"s.'.format(path_name))
+    if c.isupper():
+      result += '_'
+      result += c.lower()
+    else:
+      result += c
+  return ''.join(result)
+
+
+class _FieldMaskTree(object):
+  """Represents a FieldMask in a tree structure.
+
+  For example, given a FieldMask "foo.bar,foo.baz,bar.baz",
+  the FieldMaskTree will be:
+      [_root] -+- foo -+- bar
+            |       |
+            |       +- baz
+            |
+            +- bar --- baz
+  In the tree, each leaf node represents a field path.
+  """
+
+  __slots__ = ('_root',)
+
+  def __init__(self, field_mask=None):
+    """Initializes the tree by FieldMask."""
+    self._root = {}
+    if field_mask:
+      self.MergeFromFieldMask(field_mask)
+
+  def MergeFromFieldMask(self, field_mask):
+    """Merges a FieldMask to the tree."""
+    for path in field_mask.paths:
+      self.AddPath(path)
+
+  def AddPath(self, path):
+    """Adds a field path into the tree.
+
+    If the field path to add is a sub-path of an existing field path
+    in the tree (i.e., a leaf node), it means the tree already matches
+    the given path so nothing will be added to the tree. If the path
+    matches an existing non-leaf node in the tree, that non-leaf node
+    will be turned into a leaf node with all its children removed because
+    the path matches all the node's children. Otherwise, a new path will
+    be added.
+
+    Args:
+      path: The field path to add.
+    """
+    node = self._root
+    for name in path.split('.'):
+      if name not in node:
+        node[name] = {}
+      elif not node[name]:
+        # Pre-existing empty node implies we already have this entire tree.
+        return
+      node = node[name]
+    # Remove any sub-trees we might have had.
+    node.clear()
+
+  def ToFieldMask(self, field_mask):
+    """Converts the tree to a FieldMask."""
+    field_mask.Clear()
+    _AddFieldPaths(self._root, '', field_mask)
+
+  def IntersectPath(self, path, intersection):
+    """Calculates the intersection part of a field path with this tree.
+
+    Args:
+      path: The field path to calculates.
+      intersection: The out tree to record the intersection part.
+    """
+    node = self._root
+    for name in path.split('.'):
+      if name not in node:
+        return
+      elif not node[name]:
+        intersection.AddPath(path)
+        return
+      node = node[name]
+    intersection.AddLeafNodes(path, node)
+
+  def AddLeafNodes(self, prefix, node):
+    """Adds leaf nodes begin with prefix to this tree."""
+    if not node:
+      self.AddPath(prefix)
+    for name in node:
+      child_path = prefix + '.' + name
+      self.AddLeafNodes(child_path, node[name])
+
+  def MergeMessage(
+      self, source, destination,
+      replace_message, replace_repeated):
+    """Merge all fields specified by this tree from source to destination."""
+    _MergeMessage(
+        self._root, source, destination, replace_message, replace_repeated)
+
+
+def _StrConvert(value):
+  """Converts value to str if it is not."""
+  # This file is imported by c extension and some methods like ClearField
+  # requires string for the field name. py2/py3 has different text
+  # type and may use unicode.
+  if not isinstance(value, str):
+    return value.encode('utf-8')
+  return value
+
+
+def _MergeMessage(
+    node, source, destination, replace_message, replace_repeated):
+  """Merge all fields specified by a sub-tree from source to destination."""
+  source_descriptor = source.DESCRIPTOR
+  for name in node:
+    child = node[name]
+    field = source_descriptor.fields_by_name[name]
+    if field is None:
+      raise ValueError('Error: Can\'t find field {0} in message {1}.'.format(
+          name, source_descriptor.full_name))
+    if child:
+      # Sub-paths are only allowed for singular message fields.
+      if (field.label == FieldDescriptor.LABEL_REPEATED or
+          field.cpp_type != FieldDescriptor.CPPTYPE_MESSAGE):
+        raise ValueError('Error: Field {0} in message {1} is not a singular '
+                         'message field and cannot have sub-fields.'.format(
+                             name, source_descriptor.full_name))
+      if source.HasField(name):
+        _MergeMessage(
+            child, getattr(source, name), getattr(destination, name),
+            replace_message, replace_repeated)
+      continue
+    if field.label == FieldDescriptor.LABEL_REPEATED:
+      if replace_repeated:
+        destination.ClearField(_StrConvert(name))
+      repeated_source = getattr(source, name)
+      repeated_destination = getattr(destination, name)
+      repeated_destination.MergeFrom(repeated_source)
+    else:
+      if field.cpp_type == FieldDescriptor.CPPTYPE_MESSAGE:
+        if replace_message:
+          destination.ClearField(_StrConvert(name))
+        if source.HasField(name):
+          getattr(destination, name).MergeFrom(getattr(source, name))
+      else:
+        setattr(destination, name, getattr(source, name))
+
+
+def _AddFieldPaths(node, prefix, field_mask):
+  """Adds the field paths descended from node to field_mask."""
+  if not node and prefix:
+    field_mask.paths.append(prefix)
+    return
+  for name in sorted(node):
+    if prefix:
+      child_path = prefix + '.' + name
+    else:
+      child_path = name
+    _AddFieldPaths(node[name], child_path, field_mask)
+
+
+def _SetStructValue(struct_value, value):
+  if value is None:
+    struct_value.null_value = 0
+  elif isinstance(value, bool):
+    # Note: this check must come before the number check because in Python
+    # True and False are also considered numbers.
+    struct_value.bool_value = value
+  elif isinstance(value, str):
+    struct_value.string_value = value
+  elif isinstance(value, (int, float)):
+    struct_value.number_value = value
+  elif isinstance(value, (dict, Struct)):
+    struct_value.struct_value.Clear()
+    struct_value.struct_value.update(value)
+  elif isinstance(value, (list, ListValue)):
+    struct_value.list_value.Clear()
+    struct_value.list_value.extend(value)
+  else:
+    raise ValueError('Unexpected type')
+
+
+def _GetStructValue(struct_value):
+  which = struct_value.WhichOneof('kind')
+  if which == 'struct_value':
+    return struct_value.struct_value
+  elif which == 'null_value':
+    return None
+  elif which == 'number_value':
+    return struct_value.number_value
+  elif which == 'string_value':
+    return struct_value.string_value
+  elif which == 'bool_value':
+    return struct_value.bool_value
+  elif which == 'list_value':
+    return struct_value.list_value
+  elif which is None:
+    raise ValueError('Value not set')
+
+
+class Struct(object):
+  """Class for Struct message type."""
+
+  __slots__ = ()
+
+  def __getitem__(self, key):
+    return _GetStructValue(self.fields[key])
+
+  def __contains__(self, item):
+    return item in self.fields
+
+  def __setitem__(self, key, value):
+    _SetStructValue(self.fields[key], value)
+
+  def __delitem__(self, key):
+    del self.fields[key]
+
+  def __len__(self):
+    return len(self.fields)
+
+  def __iter__(self):
+    return iter(self.fields)
+
+  def keys(self):  # pylint: disable=invalid-name
+    return self.fields.keys()
+
+  def values(self):  # pylint: disable=invalid-name
+    return [self[key] for key in self]
+
+  def items(self):  # pylint: disable=invalid-name
+    return [(key, self[key]) for key in self]
+
+  def get_or_create_list(self, key):
+    """Returns a list for this key, creating if it didn't exist already."""
+    if not self.fields[key].HasField('list_value'):
+      # Clear will mark list_value modified which will indeed create a list.
+      self.fields[key].list_value.Clear()
+    return self.fields[key].list_value
+
+  def get_or_create_struct(self, key):
+    """Returns a struct for this key, creating if it didn't exist already."""
+    if not self.fields[key].HasField('struct_value'):
+      # Clear will mark struct_value modified which will indeed create a struct.
+      self.fields[key].struct_value.Clear()
+    return self.fields[key].struct_value
+
+  def update(self, dictionary):  # pylint: disable=invalid-name
+    for key, value in dictionary.items():
+      _SetStructValue(self.fields[key], value)
+
+collections.abc.MutableMapping.register(Struct)
+
+
+class ListValue(object):
+  """Class for ListValue message type."""
+
+  __slots__ = ()
+
+  def __len__(self):
+    return len(self.values)
+
+  def append(self, value):
+    _SetStructValue(self.values.add(), value)
+
+  def extend(self, elem_seq):
+    for value in elem_seq:
+      self.append(value)
+
+  def __getitem__(self, index):
+    """Retrieves item by the specified index."""
+    return _GetStructValue(self.values.__getitem__(index))
+
+  def __setitem__(self, index, value):
+    _SetStructValue(self.values.__getitem__(index), value)
+
+  def __delitem__(self, key):
+    del self.values[key]
+
+  def items(self):
+    for i in range(len(self)):
+      yield self[i]
+
+  def add_struct(self):
+    """Appends and returns a struct value as the next value in the list."""
+    struct_value = self.values.add().struct_value
+    # Clear will mark struct_value modified which will indeed create a struct.
+    struct_value.Clear()
+    return struct_value
+
+  def add_list(self):
+    """Appends and returns a list value as the next value in the list."""
+    list_value = self.values.add().list_value
+    # Clear will mark list_value modified which will indeed create a list.
+    list_value.Clear()
+    return list_value
+
+collections.abc.MutableSequence.register(ListValue)
+
+
+WKTBASES = {
+    'google.protobuf.Any': Any,
+    'google.protobuf.Duration': Duration,
+    'google.protobuf.FieldMask': FieldMask,
+    'google.protobuf.ListValue': ListValue,
+    'google.protobuf.Struct': Struct,
+    'google.protobuf.Timestamp': Timestamp,
+}

lib/protobuf/internal/wire_format.py

@@ -0,0 +1,268 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Constants and static functions to support protocol buffer wire format."""
+
+__author__ = 'robinson@google.com (Will Robinson)'
+
+import struct
+from google.protobuf import descriptor
+from google.protobuf import message
+
+
+TAG_TYPE_BITS = 3  # Number of bits used to hold type info in a proto tag.
+TAG_TYPE_MASK = (1 << TAG_TYPE_BITS) - 1  # 0x7
+
+# These numbers identify the wire type of a protocol buffer value.
+# We use the least-significant TAG_TYPE_BITS bits of the varint-encoded
+# tag-and-type to store one of these WIRETYPE_* constants.
+# These values must match WireType enum in google/protobuf/wire_format.h.
+WIRETYPE_VARINT = 0
+WIRETYPE_FIXED64 = 1
+WIRETYPE_LENGTH_DELIMITED = 2
+WIRETYPE_START_GROUP = 3
+WIRETYPE_END_GROUP = 4
+WIRETYPE_FIXED32 = 5
+_WIRETYPE_MAX = 5
+
+
+# Bounds for various integer types.
+INT32_MAX = int((1 << 31) - 1)
+INT32_MIN = int(-(1 << 31))
+UINT32_MAX = (1 << 32) - 1
+
+INT64_MAX = (1 << 63) - 1
+INT64_MIN = -(1 << 63)
+UINT64_MAX = (1 << 64) - 1
+
+# "struct" format strings that will encode/decode the specified formats.
+FORMAT_UINT32_LITTLE_ENDIAN = '<I'
+FORMAT_UINT64_LITTLE_ENDIAN = '<Q'
+FORMAT_FLOAT_LITTLE_ENDIAN = '<f'
+FORMAT_DOUBLE_LITTLE_ENDIAN = '<d'
+
+
+# We'll have to provide alternate implementations of AppendLittleEndian*() on
+# any architectures where these checks fail.
+if struct.calcsize(FORMAT_UINT32_LITTLE_ENDIAN) != 4:
+  raise AssertionError('Format "I" is not a 32-bit number.')
+if struct.calcsize(FORMAT_UINT64_LITTLE_ENDIAN) != 8:
+  raise AssertionError('Format "Q" is not a 64-bit number.')
+
+
+def PackTag(field_number, wire_type):
+  """Returns an unsigned 32-bit integer that encodes the field number and
+  wire type information in standard protocol message wire format.
+
+  Args:
+    field_number: Expected to be an integer in the range [1, 1 << 29)
+    wire_type: One of the WIRETYPE_* constants.
+  """
+  if not 0 <= wire_type <= _WIRETYPE_MAX:
+    raise message.EncodeError('Unknown wire type: %d' % wire_type)
+  return (field_number << TAG_TYPE_BITS) | wire_type
+
+
+def UnpackTag(tag):
+  """The inverse of PackTag().  Given an unsigned 32-bit number,
+  returns a (field_number, wire_type) tuple.
+  """
+  return (tag >> TAG_TYPE_BITS), (tag & TAG_TYPE_MASK)
+
+
+def ZigZagEncode(value):
+  """ZigZag Transform:  Encodes signed integers so that they can be
+  effectively used with varint encoding.  See wire_format.h for
+  more details.
+  """
+  if value >= 0:
+    return value << 1
+  return (value << 1) ^ (~0)
+
+
+def ZigZagDecode(value):
+  """Inverse of ZigZagEncode()."""
+  if not value & 0x1:
+    return value >> 1
+  return (value >> 1) ^ (~0)
+
+
+
+# The *ByteSize() functions below return the number of bytes required to
+# serialize "field number + type" information and then serialize the value.
+
+
+def Int32ByteSize(field_number, int32):
+  return Int64ByteSize(field_number, int32)
+
+
+def Int32ByteSizeNoTag(int32):
+  return _VarUInt64ByteSizeNoTag(0xffffffffffffffff & int32)
+
+
+def Int64ByteSize(field_number, int64):
+  # Have to convert to uint before calling UInt64ByteSize().
+  return UInt64ByteSize(field_number, 0xffffffffffffffff & int64)
+
+
+def UInt32ByteSize(field_number, uint32):
+  return UInt64ByteSize(field_number, uint32)
+
+
+def UInt64ByteSize(field_number, uint64):
+  return TagByteSize(field_number) + _VarUInt64ByteSizeNoTag(uint64)
+
+
+def SInt32ByteSize(field_number, int32):
+  return UInt32ByteSize(field_number, ZigZagEncode(int32))
+
+
+def SInt64ByteSize(field_number, int64):
+  return UInt64ByteSize(field_number, ZigZagEncode(int64))
+
+
+def Fixed32ByteSize(field_number, fixed32):
+  return TagByteSize(field_number) + 4
+
+
+def Fixed64ByteSize(field_number, fixed64):
+  return TagByteSize(field_number) + 8
+
+
+def SFixed32ByteSize(field_number, sfixed32):
+  return TagByteSize(field_number) + 4
+
+
+def SFixed64ByteSize(field_number, sfixed64):
+  return TagByteSize(field_number) + 8
+
+
+def FloatByteSize(field_number, flt):
+  return TagByteSize(field_number) + 4
+
+
+def DoubleByteSize(field_number, double):
+  return TagByteSize(field_number) + 8
+
+
+def BoolByteSize(field_number, b):
+  return TagByteSize(field_number) + 1
+
+
+def EnumByteSize(field_number, enum):
+  return UInt32ByteSize(field_number, enum)
+
+
+def StringByteSize(field_number, string):
+  return BytesByteSize(field_number, string.encode('utf-8'))
+
+
+def BytesByteSize(field_number, b):
+  return (TagByteSize(field_number)
+          + _VarUInt64ByteSizeNoTag(len(b))
+          + len(b))
+
+
+def GroupByteSize(field_number, message):
+  return (2 * TagByteSize(field_number)  # START and END group.
+          + message.ByteSize())
+
+
+def MessageByteSize(field_number, message):
+  return (TagByteSize(field_number)
+          + _VarUInt64ByteSizeNoTag(message.ByteSize())
+          + message.ByteSize())
+
+
+def MessageSetItemByteSize(field_number, msg):
+  # First compute the sizes of the tags.
+  # There are 2 tags for the beginning and ending of the repeated group, that
+  # is field number 1, one with field number 2 (type_id) and one with field
+  # number 3 (message).
+  total_size = (2 * TagByteSize(1) + TagByteSize(2) + TagByteSize(3))
+
+  # Add the number of bytes for type_id.
+  total_size += _VarUInt64ByteSizeNoTag(field_number)
+
+  message_size = msg.ByteSize()
+
+  # The number of bytes for encoding the length of the message.
+  total_size += _VarUInt64ByteSizeNoTag(message_size)
+
+  # The size of the message.
+  total_size += message_size
+  return total_size
+
+
+def TagByteSize(field_number):
+  """Returns the bytes required to serialize a tag with this field number."""
+  # Just pass in type 0, since the type won't affect the tag+type size.
+  return _VarUInt64ByteSizeNoTag(PackTag(field_number, 0))
+
+
+# Private helper function for the *ByteSize() functions above.
+
+def _VarUInt64ByteSizeNoTag(uint64):
+  """Returns the number of bytes required to serialize a single varint
+  using boundary value comparisons. (unrolled loop optimization -WPierce)
+  uint64 must be unsigned.
+  """
+  if uint64 <= 0x7f: return 1
+  if uint64 <= 0x3fff: return 2
+  if uint64 <= 0x1fffff: return 3
+  if uint64 <= 0xfffffff: return 4
+  if uint64 <= 0x7ffffffff: return 5
+  if uint64 <= 0x3ffffffffff: return 6
+  if uint64 <= 0x1ffffffffffff: return 7
+  if uint64 <= 0xffffffffffffff: return 8
+  if uint64 <= 0x7fffffffffffffff: return 9
+  if uint64 > UINT64_MAX:
+    raise message.EncodeError('Value out of range: %d' % uint64)
+  return 10
+
+
+NON_PACKABLE_TYPES = (
+  descriptor.FieldDescriptor.TYPE_STRING,
+  descriptor.FieldDescriptor.TYPE_GROUP,
+  descriptor.FieldDescriptor.TYPE_MESSAGE,
+  descriptor.FieldDescriptor.TYPE_BYTES
+)
+
+
+def IsTypePackable(field_type):
+  """Return true iff packable = true is valid for fields of this type.
+
+  Args:
+    field_type: a FieldDescriptor::Type value.
+
+  Returns:
+    True iff fields of this type are packable.
+  """
+  return field_type not in NON_PACKABLE_TYPES

lib/protobuf/json_format.py

@@ -0,0 +1,912 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Contains routines for printing protocol messages in JSON format.
+
+Simple usage example:
+
+  # Create a proto object and serialize it to a json format string.
+  message = my_proto_pb2.MyMessage(foo='bar')
+  json_string = json_format.MessageToJson(message)
+
+  # Parse a json format string to proto object.
+  message = json_format.Parse(json_string, my_proto_pb2.MyMessage())
+"""
+
+__author__ = 'jieluo@google.com (Jie Luo)'
+
+
+import base64
+from collections import OrderedDict
+import json
+import math
+from operator import methodcaller
+import re
+import sys
+
+from google.protobuf.internal import type_checkers
+from google.protobuf import descriptor
+from google.protobuf import symbol_database
+
+
+_TIMESTAMPFOMAT = '%Y-%m-%dT%H:%M:%S'
+_INT_TYPES = frozenset([descriptor.FieldDescriptor.CPPTYPE_INT32,
+                        descriptor.FieldDescriptor.CPPTYPE_UINT32,
+                        descriptor.FieldDescriptor.CPPTYPE_INT64,
+                        descriptor.FieldDescriptor.CPPTYPE_UINT64])
+_INT64_TYPES = frozenset([descriptor.FieldDescriptor.CPPTYPE_INT64,
+                          descriptor.FieldDescriptor.CPPTYPE_UINT64])
+_FLOAT_TYPES = frozenset([descriptor.FieldDescriptor.CPPTYPE_FLOAT,
+                          descriptor.FieldDescriptor.CPPTYPE_DOUBLE])
+_INFINITY = 'Infinity'
+_NEG_INFINITY = '-Infinity'
+_NAN = 'NaN'
+
+_UNPAIRED_SURROGATE_PATTERN = re.compile(
+    u'[\ud800-\udbff](?![\udc00-\udfff])|(?<![\ud800-\udbff])[\udc00-\udfff]')
+
+_VALID_EXTENSION_NAME = re.compile(r'\[[a-zA-Z0-9\._]*\]$')
+
+
+class Error(Exception):
+  """Top-level module error for json_format."""
+
+
+class SerializeToJsonError(Error):
+  """Thrown if serialization to JSON fails."""
+
+
+class ParseError(Error):
+  """Thrown in case of parsing error."""
+
+
+def MessageToJson(
+    message,
+    including_default_value_fields=False,
+    preserving_proto_field_name=False,
+    indent=2,
+    sort_keys=False,
+    use_integers_for_enums=False,
+    descriptor_pool=None,
+    float_precision=None,
+    ensure_ascii=True):
+  """Converts protobuf message to JSON format.
+
+  Args:
+    message: The protocol buffers message instance to serialize.
+    including_default_value_fields: If True, singular primitive fields,
+        repeated fields, and map fields will always be serialized.  If
+        False, only serialize non-empty fields.  Singular message fields
+        and oneof fields are not affected by this option.
+    preserving_proto_field_name: If True, use the original proto field
+        names as defined in the .proto file. If False, convert the field
+        names to lowerCamelCase.
+    indent: The JSON object will be pretty-printed with this indent level.
+        An indent level of 0 or negative will only insert newlines.
+    sort_keys: If True, then the output will be sorted by field names.
+    use_integers_for_enums: If true, print integers instead of enum names.
+    descriptor_pool: A Descriptor Pool for resolving types. If None use the
+        default.
+    float_precision: If set, use this to specify float field valid digits.
+    ensure_ascii: If True, strings with non-ASCII characters are escaped.
+        If False, Unicode strings are returned unchanged.
+
+  Returns:
+    A string containing the JSON formatted protocol buffer message.
+  """
+  printer = _Printer(
+      including_default_value_fields,
+      preserving_proto_field_name,
+      use_integers_for_enums,
+      descriptor_pool,
+      float_precision=float_precision)
+  return printer.ToJsonString(message, indent, sort_keys, ensure_ascii)
+
+
+def MessageToDict(
+    message,
+    including_default_value_fields=False,
+    preserving_proto_field_name=False,
+    use_integers_for_enums=False,
+    descriptor_pool=None,
+    float_precision=None):
+  """Converts protobuf message to a dictionary.
+
+  When the dictionary is encoded to JSON, it conforms to proto3 JSON spec.
+
+  Args:
+    message: The protocol buffers message instance to serialize.
+    including_default_value_fields: If True, singular primitive fields,
+        repeated fields, and map fields will always be serialized.  If
+        False, only serialize non-empty fields.  Singular message fields
+        and oneof fields are not affected by this option.
+    preserving_proto_field_name: If True, use the original proto field
+        names as defined in the .proto file. If False, convert the field
+        names to lowerCamelCase.
+    use_integers_for_enums: If true, print integers instead of enum names.
+    descriptor_pool: A Descriptor Pool for resolving types. If None use the
+        default.
+    float_precision: If set, use this to specify float field valid digits.
+
+  Returns:
+    A dict representation of the protocol buffer message.
+  """
+  printer = _Printer(
+      including_default_value_fields,
+      preserving_proto_field_name,
+      use_integers_for_enums,
+      descriptor_pool,
+      float_precision=float_precision)
+  # pylint: disable=protected-access
+  return printer._MessageToJsonObject(message)
+
+
+def _IsMapEntry(field):
+  return (field.type == descriptor.FieldDescriptor.TYPE_MESSAGE and
+          field.message_type.has_options and
+          field.message_type.GetOptions().map_entry)
+
+
+class _Printer(object):
+  """JSON format printer for protocol message."""
+
+  def __init__(
+      self,
+      including_default_value_fields=False,
+      preserving_proto_field_name=False,
+      use_integers_for_enums=False,
+      descriptor_pool=None,
+      float_precision=None):
+    self.including_default_value_fields = including_default_value_fields
+    self.preserving_proto_field_name = preserving_proto_field_name
+    self.use_integers_for_enums = use_integers_for_enums
+    self.descriptor_pool = descriptor_pool
+    if float_precision:
+      self.float_format = '.{}g'.format(float_precision)
+    else:
+      self.float_format = None
+
+  def ToJsonString(self, message, indent, sort_keys, ensure_ascii):
+    js = self._MessageToJsonObject(message)
+    return json.dumps(
+        js, indent=indent, sort_keys=sort_keys, ensure_ascii=ensure_ascii)
+
+  def _MessageToJsonObject(self, message):
+    """Converts message to an object according to Proto3 JSON Specification."""
+    message_descriptor = message.DESCRIPTOR
+    full_name = message_descriptor.full_name
+    if _IsWrapperMessage(message_descriptor):
+      return self._WrapperMessageToJsonObject(message)
+    if full_name in _WKTJSONMETHODS:
+      return methodcaller(_WKTJSONMETHODS[full_name][0], message)(self)
+    js = {}
+    return self._RegularMessageToJsonObject(message, js)
+
+  def _RegularMessageToJsonObject(self, message, js):
+    """Converts normal message according to Proto3 JSON Specification."""
+    fields = message.ListFields()
+
+    try:
+      for field, value in fields:
+        if self.preserving_proto_field_name:
+          name = field.name
+        else:
+          name = field.json_name
+        if _IsMapEntry(field):
+          # Convert a map field.
+          v_field = field.message_type.fields_by_name['value']
+          js_map = {}
+          for key in value:
+            if isinstance(key, bool):
+              if key:
+                recorded_key = 'true'
+              else:
+                recorded_key = 'false'
+            else:
+              recorded_key = str(key)
+            js_map[recorded_key] = self._FieldToJsonObject(
+                v_field, value[key])
+          js[name] = js_map
+        elif field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
+          # Convert a repeated field.
+          js[name] = [self._FieldToJsonObject(field, k)
+                      for k in value]
+        elif field.is_extension:
+          name = '[%s]' % field.full_name
+          js[name] = self._FieldToJsonObject(field, value)
+        else:
+          js[name] = self._FieldToJsonObject(field, value)
+
+      # Serialize default value if including_default_value_fields is True.
+      if self.including_default_value_fields:
+        message_descriptor = message.DESCRIPTOR
+        for field in message_descriptor.fields:
+          # Singular message fields and oneof fields will not be affected.
+          if ((field.label != descriptor.FieldDescriptor.LABEL_REPEATED and
+               field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE) or
+              field.containing_oneof):
+            continue
+          if self.preserving_proto_field_name:
+            name = field.name
+          else:
+            name = field.json_name
+          if name in js:
+            # Skip the field which has been serialized already.
+            continue
+          if _IsMapEntry(field):
+            js[name] = {}
+          elif field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
+            js[name] = []
+          else:
+            js[name] = self._FieldToJsonObject(field, field.default_value)
+
+    except ValueError as e:
+      raise SerializeToJsonError(
+          'Failed to serialize {0} field: {1}.'.format(field.name, e))
+
+    return js
+
+  def _FieldToJsonObject(self, field, value):
+    """Converts field value according to Proto3 JSON Specification."""
+    if field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
+      return self._MessageToJsonObject(value)
+    elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_ENUM:
+      if self.use_integers_for_enums:
+        return value
+      if field.enum_type.full_name == 'google.protobuf.NullValue':
+        return None
+      enum_value = field.enum_type.values_by_number.get(value, None)
+      if enum_value is not None:
+        return enum_value.name
+      else:
+        if field.file.syntax == 'proto3':
+          return value
+        raise SerializeToJsonError('Enum field contains an integer value '
+                                   'which can not mapped to an enum value.')
+    elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_STRING:
+      if field.type == descriptor.FieldDescriptor.TYPE_BYTES:
+        # Use base64 Data encoding for bytes
+        return base64.b64encode(value).decode('utf-8')
+      else:
+        return value
+    elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_BOOL:
+      return bool(value)
+    elif field.cpp_type in _INT64_TYPES:
+      return str(value)
+    elif field.cpp_type in _FLOAT_TYPES:
+      if math.isinf(value):
+        if value < 0.0:
+          return _NEG_INFINITY
+        else:
+          return _INFINITY
+      if math.isnan(value):
+        return _NAN
+      if field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_FLOAT:
+        if self.float_format:
+          return float(format(value, self.float_format))
+        else:
+          return type_checkers.ToShortestFloat(value)
+
+    return value
+
+  def _AnyMessageToJsonObject(self, message):
+    """Converts Any message according to Proto3 JSON Specification."""
+    if not message.ListFields():
+      return {}
+    # Must print @type first, use OrderedDict instead of {}
+    js = OrderedDict()
+    type_url = message.type_url
+    js['@type'] = type_url
+    sub_message = _CreateMessageFromTypeUrl(type_url, self.descriptor_pool)
+    sub_message.ParseFromString(message.value)
+    message_descriptor = sub_message.DESCRIPTOR
+    full_name = message_descriptor.full_name
+    if _IsWrapperMessage(message_descriptor):
+      js['value'] = self._WrapperMessageToJsonObject(sub_message)
+      return js
+    if full_name in _WKTJSONMETHODS:
+      js['value'] = methodcaller(_WKTJSONMETHODS[full_name][0],
+                                 sub_message)(self)
+      return js
+    return self._RegularMessageToJsonObject(sub_message, js)
+
+  def _GenericMessageToJsonObject(self, message):
+    """Converts message according to Proto3 JSON Specification."""
+    # Duration, Timestamp and FieldMask have ToJsonString method to do the
+    # convert. Users can also call the method directly.
+    return message.ToJsonString()
+
+  def _ValueMessageToJsonObject(self, message):
+    """Converts Value message according to Proto3 JSON Specification."""
+    which = message.WhichOneof('kind')
+    # If the Value message is not set treat as null_value when serialize
+    # to JSON. The parse back result will be different from original message.
+    if which is None or which == 'null_value':
+      return None
+    if which == 'list_value':
+      return self._ListValueMessageToJsonObject(message.list_value)
+    if which == 'struct_value':
+      value = message.struct_value
+    else:
+      value = getattr(message, which)
+    oneof_descriptor = message.DESCRIPTOR.fields_by_name[which]
+    return self._FieldToJsonObject(oneof_descriptor, value)
+
+  def _ListValueMessageToJsonObject(self, message):
+    """Converts ListValue message according to Proto3 JSON Specification."""
+    return [self._ValueMessageToJsonObject(value)
+            for value in message.values]
+
+  def _StructMessageToJsonObject(self, message):
+    """Converts Struct message according to Proto3 JSON Specification."""
+    fields = message.fields
+    ret = {}
+    for key in fields:
+      ret[key] = self._ValueMessageToJsonObject(fields[key])
+    return ret
+
+  def _WrapperMessageToJsonObject(self, message):
+    return self._FieldToJsonObject(
+        message.DESCRIPTOR.fields_by_name['value'], message.value)
+
+
+def _IsWrapperMessage(message_descriptor):
+  return message_descriptor.file.name == 'google/protobuf/wrappers.proto'
+
+
+def _DuplicateChecker(js):
+  result = {}
+  for name, value in js:
+    if name in result:
+      raise ParseError('Failed to load JSON: duplicate key {0}.'.format(name))
+    result[name] = value
+  return result
+
+
+def _CreateMessageFromTypeUrl(type_url, descriptor_pool):
+  """Creates a message from a type URL."""
+  db = symbol_database.Default()
+  pool = db.pool if descriptor_pool is None else descriptor_pool
+  type_name = type_url.split('/')[-1]
+  try:
+    message_descriptor = pool.FindMessageTypeByName(type_name)
+  except KeyError:
+    raise TypeError(
+        'Can not find message descriptor by type_url: {0}'.format(type_url))
+  message_class = db.GetPrototype(message_descriptor)
+  return message_class()
+
+
+def Parse(text,
+          message,
+          ignore_unknown_fields=False,
+          descriptor_pool=None,
+          max_recursion_depth=100):
+  """Parses a JSON representation of a protocol message into a message.
+
+  Args:
+    text: Message JSON representation.
+    message: A protocol buffer message to merge into.
+    ignore_unknown_fields: If True, do not raise errors for unknown fields.
+    descriptor_pool: A Descriptor Pool for resolving types. If None use the
+      default.
+    max_recursion_depth: max recursion depth of JSON message to be
+      deserialized. JSON messages over this depth will fail to be
+      deserialized. Default value is 100.
+
+  Returns:
+    The same message passed as argument.
+
+  Raises::
+    ParseError: On JSON parsing problems.
+  """
+  if not isinstance(text, str):
+    text = text.decode('utf-8')
+  try:
+    js = json.loads(text, object_pairs_hook=_DuplicateChecker)
+  except ValueError as e:
+    raise ParseError('Failed to load JSON: {0}.'.format(str(e)))
+  return ParseDict(js, message, ignore_unknown_fields, descriptor_pool,
+                   max_recursion_depth)
+
+
+def ParseDict(js_dict,
+              message,
+              ignore_unknown_fields=False,
+              descriptor_pool=None,
+              max_recursion_depth=100):
+  """Parses a JSON dictionary representation into a message.
+
+  Args:
+    js_dict: Dict representation of a JSON message.
+    message: A protocol buffer message to merge into.
+    ignore_unknown_fields: If True, do not raise errors for unknown fields.
+    descriptor_pool: A Descriptor Pool for resolving types. If None use the
+      default.
+    max_recursion_depth: max recursion depth of JSON message to be
+      deserialized. JSON messages over this depth will fail to be
+      deserialized. Default value is 100.
+
+  Returns:
+    The same message passed as argument.
+  """
+  parser = _Parser(ignore_unknown_fields, descriptor_pool, max_recursion_depth)
+  parser.ConvertMessage(js_dict, message, '')
+  return message
+
+
+_INT_OR_FLOAT = (int, float)
+
+
+class _Parser(object):
+  """JSON format parser for protocol message."""
+
+  def __init__(self, ignore_unknown_fields, descriptor_pool,
+               max_recursion_depth):
+    self.ignore_unknown_fields = ignore_unknown_fields
+    self.descriptor_pool = descriptor_pool
+    self.max_recursion_depth = max_recursion_depth
+    self.recursion_depth = 0
+
+  def ConvertMessage(self, value, message, path):
+    """Convert a JSON object into a message.
+
+    Args:
+      value: A JSON object.
+      message: A WKT or regular protocol message to record the data.
+      path: parent path to log parse error info.
+
+    Raises:
+      ParseError: In case of convert problems.
+    """
+    self.recursion_depth += 1
+    if self.recursion_depth > self.max_recursion_depth:
+      raise ParseError('Message too deep. Max recursion depth is {0}'.format(
+          self.max_recursion_depth))
+    message_descriptor = message.DESCRIPTOR
+    full_name = message_descriptor.full_name
+    if not path:
+      path = message_descriptor.name
+    if _IsWrapperMessage(message_descriptor):
+      self._ConvertWrapperMessage(value, message, path)
+    elif full_name in _WKTJSONMETHODS:
+      methodcaller(_WKTJSONMETHODS[full_name][1], value, message, path)(self)
+    else:
+      self._ConvertFieldValuePair(value, message, path)
+    self.recursion_depth -= 1
+
+  def _ConvertFieldValuePair(self, js, message, path):
+    """Convert field value pairs into regular message.
+
+    Args:
+      js: A JSON object to convert the field value pairs.
+      message: A regular protocol message to record the data.
+      path: parent path to log parse error info.
+
+    Raises:
+      ParseError: In case of problems converting.
+    """
+    names = []
+    message_descriptor = message.DESCRIPTOR
+    fields_by_json_name = dict((f.json_name, f)
+                               for f in message_descriptor.fields)
+    for name in js:
+      try:
+        field = fields_by_json_name.get(name, None)
+        if not field:
+          field = message_descriptor.fields_by_name.get(name, None)
+        if not field and _VALID_EXTENSION_NAME.match(name):
+          if not message_descriptor.is_extendable:
+            raise ParseError(
+                'Message type {0} does not have extensions at {1}'.format(
+                    message_descriptor.full_name, path))
+          identifier = name[1:-1]  # strip [] brackets
+          # pylint: disable=protected-access
+          field = message.Extensions._FindExtensionByName(identifier)
+          # pylint: enable=protected-access
+          if not field:
+            # Try looking for extension by the message type name, dropping the
+            # field name following the final . separator in full_name.
+            identifier = '.'.join(identifier.split('.')[:-1])
+            # pylint: disable=protected-access
+            field = message.Extensions._FindExtensionByName(identifier)
+            # pylint: enable=protected-access
+        if not field:
+          if self.ignore_unknown_fields:
+            continue
+          raise ParseError(
+              ('Message type "{0}" has no field named "{1}" at "{2}".\n'
+               ' Available Fields(except extensions): "{3}"').format(
+                   message_descriptor.full_name, name, path,
+                   [f.json_name for f in message_descriptor.fields]))
+        if name in names:
+          raise ParseError('Message type "{0}" should not have multiple '
+                           '"{1}" fields at "{2}".'.format(
+                               message.DESCRIPTOR.full_name, name, path))
+        names.append(name)
+        value = js[name]
+        # Check no other oneof field is parsed.
+        if field.containing_oneof is not None and value is not None:
+          oneof_name = field.containing_oneof.name
+          if oneof_name in names:
+            raise ParseError('Message type "{0}" should not have multiple '
+                             '"{1}" oneof fields at "{2}".'.format(
+                                 message.DESCRIPTOR.full_name, oneof_name,
+                                 path))
+          names.append(oneof_name)
+
+        if value is None:
+          if (field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE
+              and field.message_type.full_name == 'google.protobuf.Value'):
+            sub_message = getattr(message, field.name)
+            sub_message.null_value = 0
+          elif (field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_ENUM
+                and field.enum_type.full_name == 'google.protobuf.NullValue'):
+            setattr(message, field.name, 0)
+          else:
+            message.ClearField(field.name)
+          continue
+
+        # Parse field value.
+        if _IsMapEntry(field):
+          message.ClearField(field.name)
+          self._ConvertMapFieldValue(value, message, field,
+                                     '{0}.{1}'.format(path, name))
+        elif field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
+          message.ClearField(field.name)
+          if not isinstance(value, list):
+            raise ParseError('repeated field {0} must be in [] which is '
+                             '{1} at {2}'.format(name, value, path))
+          if field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
+            # Repeated message field.
+            for index, item in enumerate(value):
+              sub_message = getattr(message, field.name).add()
+              # None is a null_value in Value.
+              if (item is None and
+                  sub_message.DESCRIPTOR.full_name != 'google.protobuf.Value'):
+                raise ParseError('null is not allowed to be used as an element'
+                                 ' in a repeated field at {0}.{1}[{2}]'.format(
+                                     path, name, index))
+              self.ConvertMessage(item, sub_message,
+                                  '{0}.{1}[{2}]'.format(path, name, index))
+          else:
+            # Repeated scalar field.
+            for index, item in enumerate(value):
+              if item is None:
+                raise ParseError('null is not allowed to be used as an element'
+                                 ' in a repeated field at {0}.{1}[{2}]'.format(
+                                     path, name, index))
+              getattr(message, field.name).append(
+                  _ConvertScalarFieldValue(
+                      item, field, '{0}.{1}[{2}]'.format(path, name, index)))
+        elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
+          if field.is_extension:
+            sub_message = message.Extensions[field]
+          else:
+            sub_message = getattr(message, field.name)
+          sub_message.SetInParent()
+          self.ConvertMessage(value, sub_message, '{0}.{1}'.format(path, name))
+        else:
+          if field.is_extension:
+            message.Extensions[field] = _ConvertScalarFieldValue(
+                value, field, '{0}.{1}'.format(path, name))
+          else:
+            setattr(
+                message, field.name,
+                _ConvertScalarFieldValue(value, field,
+                                         '{0}.{1}'.format(path, name)))
+      except ParseError as e:
+        if field and field.containing_oneof is None:
+          raise ParseError('Failed to parse {0} field: {1}.'.format(name, e))
+        else:
+          raise ParseError(str(e))
+      except ValueError as e:
+        raise ParseError('Failed to parse {0} field: {1}.'.format(name, e))
+      except TypeError as e:
+        raise ParseError('Failed to parse {0} field: {1}.'.format(name, e))
+
+  def _ConvertAnyMessage(self, value, message, path):
+    """Convert a JSON representation into Any message."""
+    if isinstance(value, dict) and not value:
+      return
+    try:
+      type_url = value['@type']
+    except KeyError:
+      raise ParseError(
+          '@type is missing when parsing any message at {0}'.format(path))
+
+    try:
+      sub_message = _CreateMessageFromTypeUrl(type_url, self.descriptor_pool)
+    except TypeError as e:
+      raise ParseError('{0} at {1}'.format(e, path))
+    message_descriptor = sub_message.DESCRIPTOR
+    full_name = message_descriptor.full_name
+    if _IsWrapperMessage(message_descriptor):
+      self._ConvertWrapperMessage(value['value'], sub_message,
+                                  '{0}.value'.format(path))
+    elif full_name in _WKTJSONMETHODS:
+      methodcaller(_WKTJSONMETHODS[full_name][1], value['value'], sub_message,
+                   '{0}.value'.format(path))(
+                       self)
+    else:
+      del value['@type']
+      self._ConvertFieldValuePair(value, sub_message, path)
+      value['@type'] = type_url
+    # Sets Any message
+    message.value = sub_message.SerializeToString()
+    message.type_url = type_url
+
+  def _ConvertGenericMessage(self, value, message, path):
+    """Convert a JSON representation into message with FromJsonString."""
+    # Duration, Timestamp, FieldMask have a FromJsonString method to do the
+    # conversion. Users can also call the method directly.
+    try:
+      message.FromJsonString(value)
+    except ValueError as e:
+      raise ParseError('{0} at {1}'.format(e, path))
+
+  def _ConvertValueMessage(self, value, message, path):
+    """Convert a JSON representation into Value message."""
+    if isinstance(value, dict):
+      self._ConvertStructMessage(value, message.struct_value, path)
+    elif isinstance(value, list):
+      self._ConvertListValueMessage(value, message.list_value, path)
+    elif value is None:
+      message.null_value = 0
+    elif isinstance(value, bool):
+      message.bool_value = value
+    elif isinstance(value, str):
+      message.string_value = value
+    elif isinstance(value, _INT_OR_FLOAT):
+      message.number_value = value
+    else:
+      raise ParseError('Value {0} has unexpected type {1} at {2}'.format(
+          value, type(value), path))
+
+  def _ConvertListValueMessage(self, value, message, path):
+    """Convert a JSON representation into ListValue message."""
+    if not isinstance(value, list):
+      raise ParseError('ListValue must be in [] which is {0} at {1}'.format(
+          value, path))
+    message.ClearField('values')
+    for index, item in enumerate(value):
+      self._ConvertValueMessage(item, message.values.add(),
+                                '{0}[{1}]'.format(path, index))
+
+  def _ConvertStructMessage(self, value, message, path):
+    """Convert a JSON representation into Struct message."""
+    if not isinstance(value, dict):
+      raise ParseError('Struct must be in a dict which is {0} at {1}'.format(
+          value, path))
+    # Clear will mark the struct as modified so it will be created even if
+    # there are no values.
+    message.Clear()
+    for key in value:
+      self._ConvertValueMessage(value[key], message.fields[key],
+                                '{0}.{1}'.format(path, key))
+    return
+
+  def _ConvertWrapperMessage(self, value, message, path):
+    """Convert a JSON representation into Wrapper message."""
+    field = message.DESCRIPTOR.fields_by_name['value']
+    setattr(
+        message, 'value',
+        _ConvertScalarFieldValue(value, field, path='{0}.value'.format(path)))
+
+  def _ConvertMapFieldValue(self, value, message, field, path):
+    """Convert map field value for a message map field.
+
+    Args:
+      value: A JSON object to convert the map field value.
+      message: A protocol message to record the converted data.
+      field: The descriptor of the map field to be converted.
+      path: parent path to log parse error info.
+
+    Raises:
+      ParseError: In case of convert problems.
+    """
+    if not isinstance(value, dict):
+      raise ParseError(
+          'Map field {0} must be in a dict which is {1} at {2}'.format(
+              field.name, value, path))
+    key_field = field.message_type.fields_by_name['key']
+    value_field = field.message_type.fields_by_name['value']
+    for key in value:
+      key_value = _ConvertScalarFieldValue(key, key_field,
+                                           '{0}.key'.format(path), True)
+      if value_field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
+        self.ConvertMessage(value[key],
+                            getattr(message, field.name)[key_value],
+                            '{0}[{1}]'.format(path, key_value))
+      else:
+        getattr(message, field.name)[key_value] = _ConvertScalarFieldValue(
+            value[key], value_field, path='{0}[{1}]'.format(path, key_value))
+
+
+def _ConvertScalarFieldValue(value, field, path, require_str=False):
+  """Convert a single scalar field value.
+
+  Args:
+    value: A scalar value to convert the scalar field value.
+    field: The descriptor of the field to convert.
+    path: parent path to log parse error info.
+    require_str: If True, the field value must be a str.
+
+  Returns:
+    The converted scalar field value
+
+  Raises:
+    ParseError: In case of convert problems.
+  """
+  try:
+    if field.cpp_type in _INT_TYPES:
+      return _ConvertInteger(value)
+    elif field.cpp_type in _FLOAT_TYPES:
+      return _ConvertFloat(value, field)
+    elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_BOOL:
+      return _ConvertBool(value, require_str)
+    elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_STRING:
+      if field.type == descriptor.FieldDescriptor.TYPE_BYTES:
+        if isinstance(value, str):
+          encoded = value.encode('utf-8')
+        else:
+          encoded = value
+        # Add extra padding '='
+        padded_value = encoded + b'=' * (4 - len(encoded) % 4)
+        return base64.urlsafe_b64decode(padded_value)
+      else:
+        # Checking for unpaired surrogates appears to be unreliable,
+        # depending on the specific Python version, so we check manually.
+        if _UNPAIRED_SURROGATE_PATTERN.search(value):
+          raise ParseError('Unpaired surrogate')
+        return value
+    elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_ENUM:
+      # Convert an enum value.
+      enum_value = field.enum_type.values_by_name.get(value, None)
+      if enum_value is None:
+        try:
+          number = int(value)
+          enum_value = field.enum_type.values_by_number.get(number, None)
+        except ValueError:
+          raise ParseError('Invalid enum value {0} for enum type {1}'.format(
+              value, field.enum_type.full_name))
+        if enum_value is None:
+          if field.file.syntax == 'proto3':
+            # Proto3 accepts unknown enums.
+            return number
+          raise ParseError('Invalid enum value {0} for enum type {1}'.format(
+              value, field.enum_type.full_name))
+      return enum_value.number
+  except ParseError as e:
+    raise ParseError('{0} at {1}'.format(e, path))
+
+
+def _ConvertInteger(value):
+  """Convert an integer.
+
+  Args:
+    value: A scalar value to convert.
+
+  Returns:
+    The integer value.
+
+  Raises:
+    ParseError: If an integer couldn't be consumed.
+  """
+  if isinstance(value, float) and not value.is_integer():
+    raise ParseError('Couldn\'t parse integer: {0}'.format(value))
+
+  if isinstance(value, str) and value.find(' ') != -1:
+    raise ParseError('Couldn\'t parse integer: "{0}"'.format(value))
+
+  if isinstance(value, bool):
+    raise ParseError('Bool value {0} is not acceptable for '
+                     'integer field'.format(value))
+
+  return int(value)
+
+
+def _ConvertFloat(value, field):
+  """Convert an floating point number."""
+  if isinstance(value, float):
+    if math.isnan(value):
+      raise ParseError('Couldn\'t parse NaN, use quoted "NaN" instead')
+    if math.isinf(value):
+      if value > 0:
+        raise ParseError('Couldn\'t parse Infinity or value too large, '
+                         'use quoted "Infinity" instead')
+      else:
+        raise ParseError('Couldn\'t parse -Infinity or value too small, '
+                         'use quoted "-Infinity" instead')
+    if field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_FLOAT:
+      # pylint: disable=protected-access
+      if value > type_checkers._FLOAT_MAX:
+        raise ParseError('Float value too large')
+      # pylint: disable=protected-access
+      if value < type_checkers._FLOAT_MIN:
+        raise ParseError('Float value too small')
+  if value == 'nan':
+    raise ParseError('Couldn\'t parse float "nan", use "NaN" instead')
+  try:
+    # Assume Python compatible syntax.
+    return float(value)
+  except ValueError:
+    # Check alternative spellings.
+    if value == _NEG_INFINITY:
+      return float('-inf')
+    elif value == _INFINITY:
+      return float('inf')
+    elif value == _NAN:
+      return float('nan')
+    else:
+      raise ParseError('Couldn\'t parse float: {0}'.format(value))
+
+
+def _ConvertBool(value, require_str):
+  """Convert a boolean value.
+
+  Args:
+    value: A scalar value to convert.
+    require_str: If True, value must be a str.
+
+  Returns:
+    The bool parsed.
+
+  Raises:
+    ParseError: If a boolean value couldn't be consumed.
+  """
+  if require_str:
+    if value == 'true':
+      return True
+    elif value == 'false':
+      return False
+    else:
+      raise ParseError('Expected "true" or "false", not {0}'.format(value))
+
+  if not isinstance(value, bool):
+    raise ParseError('Expected true or false without quotes')
+  return value
+
+_WKTJSONMETHODS = {
+    'google.protobuf.Any': ['_AnyMessageToJsonObject',
+                            '_ConvertAnyMessage'],
+    'google.protobuf.Duration': ['_GenericMessageToJsonObject',
+                                 '_ConvertGenericMessage'],
+    'google.protobuf.FieldMask': ['_GenericMessageToJsonObject',
+                                  '_ConvertGenericMessage'],
+    'google.protobuf.ListValue': ['_ListValueMessageToJsonObject',
+                                  '_ConvertListValueMessage'],
+    'google.protobuf.Struct': ['_StructMessageToJsonObject',
+                               '_ConvertStructMessage'],
+    'google.protobuf.Timestamp': ['_GenericMessageToJsonObject',
+                                  '_ConvertGenericMessage'],
+    'google.protobuf.Value': ['_ValueMessageToJsonObject',
+                              '_ConvertValueMessage']
+}

lib/protobuf/message.py

@@ -0,0 +1,424 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# TODO(robinson): We should just make these methods all "pure-virtual" and move
+# all implementation out, into reflection.py for now.
+
+
+"""Contains an abstract base class for protocol messages."""
+
+__author__ = 'robinson@google.com (Will Robinson)'
+
+class Error(Exception):
+  """Base error type for this module."""
+  pass
+
+
+class DecodeError(Error):
+  """Exception raised when deserializing messages."""
+  pass
+
+
+class EncodeError(Error):
+  """Exception raised when serializing messages."""
+  pass
+
+
+class Message(object):
+
+  """Abstract base class for protocol messages.
+
+  Protocol message classes are almost always generated by the protocol
+  compiler.  These generated types subclass Message and implement the methods
+  shown below.
+  """
+
+  # TODO(robinson): Link to an HTML document here.
+
+  # TODO(robinson): Document that instances of this class will also
+  # have an Extensions attribute with __getitem__ and __setitem__.
+  # Again, not sure how to best convey this.
+
+  # TODO(robinson): Document that the class must also have a static
+  #   RegisterExtension(extension_field) method.
+  #   Not sure how to best express at this point.
+
+  # TODO(robinson): Document these fields and methods.
+
+  __slots__ = []
+
+  #: The :class:`google.protobuf.descriptor.Descriptor` for this message type.
+  DESCRIPTOR = None
+
+  def __deepcopy__(self, memo=None):
+    clone = type(self)()
+    clone.MergeFrom(self)
+    return clone
+
+  def __eq__(self, other_msg):
+    """Recursively compares two messages by value and structure."""
+    raise NotImplementedError
+
+  def __ne__(self, other_msg):
+    # Can't just say self != other_msg, since that would infinitely recurse. :)
+    return not self == other_msg
+
+  def __hash__(self):
+    raise TypeError('unhashable object')
+
+  def __str__(self):
+    """Outputs a human-readable representation of the message."""
+    raise NotImplementedError
+
+  def __unicode__(self):
+    """Outputs a human-readable representation of the message."""
+    raise NotImplementedError
+
+  def MergeFrom(self, other_msg):
+    """Merges the contents of the specified message into current message.
+
+    This method merges the contents of the specified message into the current
+    message. Singular fields that are set in the specified message overwrite
+    the corresponding fields in the current message. Repeated fields are
+    appended. Singular sub-messages and groups are recursively merged.
+
+    Args:
+      other_msg (Message): A message to merge into the current message.
+    """
+    raise NotImplementedError
+
+  def CopyFrom(self, other_msg):
+    """Copies the content of the specified message into the current message.
+
+    The method clears the current message and then merges the specified
+    message using MergeFrom.
+
+    Args:
+      other_msg (Message): A message to copy into the current one.
+    """
+    if self is other_msg:
+      return
+    self.Clear()
+    self.MergeFrom(other_msg)
+
+  def Clear(self):
+    """Clears all data that was set in the message."""
+    raise NotImplementedError
+
+  def SetInParent(self):
+    """Mark this as present in the parent.
+
+    This normally happens automatically when you assign a field of a
+    sub-message, but sometimes you want to make the sub-message
+    present while keeping it empty.  If you find yourself using this,
+    you may want to reconsider your design.
+    """
+    raise NotImplementedError
+
+  def IsInitialized(self):
+    """Checks if the message is initialized.
+
+    Returns:
+      bool: The method returns True if the message is initialized (i.e. all of
+      its required fields are set).
+    """
+    raise NotImplementedError
+
+  # TODO(robinson): MergeFromString() should probably return None and be
+  # implemented in terms of a helper that returns the # of bytes read.  Our
+  # deserialization routines would use the helper when recursively
+  # deserializing, but the end user would almost always just want the no-return
+  # MergeFromString().
+
+  def MergeFromString(self, serialized):
+    """Merges serialized protocol buffer data into this message.
+
+    When we find a field in `serialized` that is already present
+    in this message:
+
+    -   If it's a "repeated" field, we append to the end of our list.
+    -   Else, if it's a scalar, we overwrite our field.
+    -   Else, (it's a nonrepeated composite), we recursively merge
+        into the existing composite.
+
+    Args:
+      serialized (bytes): Any object that allows us to call
+        ``memoryview(serialized)`` to access a string of bytes using the
+        buffer interface.
+
+    Returns:
+      int: The number of bytes read from `serialized`.
+      For non-group messages, this will always be `len(serialized)`,
+      but for messages which are actually groups, this will
+      generally be less than `len(serialized)`, since we must
+      stop when we reach an ``END_GROUP`` tag.  Note that if
+      we *do* stop because of an ``END_GROUP`` tag, the number
+      of bytes returned does not include the bytes
+      for the ``END_GROUP`` tag information.
+
+    Raises:
+      DecodeError: if the input cannot be parsed.
+    """
+    # TODO(robinson): Document handling of unknown fields.
+    # TODO(robinson): When we switch to a helper, this will return None.
+    raise NotImplementedError
+
+  def ParseFromString(self, serialized):
+    """Parse serialized protocol buffer data into this message.
+
+    Like :func:`MergeFromString()`, except we clear the object first.
+
+    Raises:
+      message.DecodeError if the input cannot be parsed.
+    """
+    self.Clear()
+    return self.MergeFromString(serialized)
+
+  def SerializeToString(self, **kwargs):
+    """Serializes the protocol message to a binary string.
+
+    Keyword Args:
+      deterministic (bool): If true, requests deterministic serialization
+        of the protobuf, with predictable ordering of map keys.
+
+    Returns:
+      A binary string representation of the message if all of the required
+      fields in the message are set (i.e. the message is initialized).
+
+    Raises:
+      EncodeError: if the message isn't initialized (see :func:`IsInitialized`).
+    """
+    raise NotImplementedError
+
+  def SerializePartialToString(self, **kwargs):
+    """Serializes the protocol message to a binary string.
+
+    This method is similar to SerializeToString but doesn't check if the
+    message is initialized.
+
+    Keyword Args:
+      deterministic (bool): If true, requests deterministic serialization
+        of the protobuf, with predictable ordering of map keys.
+
+    Returns:
+      bytes: A serialized representation of the partial message.
+    """
+    raise NotImplementedError
+
+  # TODO(robinson): Decide whether we like these better
+  # than auto-generated has_foo() and clear_foo() methods
+  # on the instances themselves.  This way is less consistent
+  # with C++, but it makes reflection-type access easier and
+  # reduces the number of magically autogenerated things.
+  #
+  # TODO(robinson): Be sure to document (and test) exactly
+  # which field names are accepted here.  Are we case-sensitive?
+  # What do we do with fields that share names with Python keywords
+  # like 'lambda' and 'yield'?
+  #
+  # nnorwitz says:
+  # """
+  # Typically (in python), an underscore is appended to names that are
+  # keywords. So they would become lambda_ or yield_.
+  # """
+  def ListFields(self):
+    """Returns a list of (FieldDescriptor, value) tuples for present fields.
+
+    A message field is non-empty if HasField() would return true. A singular
+    primitive field is non-empty if HasField() would return true in proto2 or it
+    is non zero in proto3. A repeated field is non-empty if it contains at least
+    one element. The fields are ordered by field number.
+
+    Returns:
+      list[tuple(FieldDescriptor, value)]: field descriptors and values
+      for all fields in the message which are not empty. The values vary by
+      field type.
+    """
+    raise NotImplementedError
+
+  def HasField(self, field_name):
+    """Checks if a certain field is set for the message.
+
+    For a oneof group, checks if any field inside is set. Note that if the
+    field_name is not defined in the message descriptor, :exc:`ValueError` will
+    be raised.
+
+    Args:
+      field_name (str): The name of the field to check for presence.
+
+    Returns:
+      bool: Whether a value has been set for the named field.
+
+    Raises:
+      ValueError: if the `field_name` is not a member of this message.
+    """
+    raise NotImplementedError
+
+  def ClearField(self, field_name):
+    """Clears the contents of a given field.
+
+    Inside a oneof group, clears the field set. If the name neither refers to a
+    defined field or oneof group, :exc:`ValueError` is raised.
+
+    Args:
+      field_name (str): The name of the field to check for presence.
+
+    Raises:
+      ValueError: if the `field_name` is not a member of this message.
+    """
+    raise NotImplementedError
+
+  def WhichOneof(self, oneof_group):
+    """Returns the name of the field that is set inside a oneof group.
+
+    If no field is set, returns None.
+
+    Args:
+      oneof_group (str): the name of the oneof group to check.
+
+    Returns:
+      str or None: The name of the group that is set, or None.
+
+    Raises:
+      ValueError: no group with the given name exists
+    """
+    raise NotImplementedError
+
+  def HasExtension(self, extension_handle):
+    """Checks if a certain extension is present for this message.
+
+    Extensions are retrieved using the :attr:`Extensions` mapping (if present).
+
+    Args:
+      extension_handle: The handle for the extension to check.
+
+    Returns:
+      bool: Whether the extension is present for this message.
+
+    Raises:
+      KeyError: if the extension is repeated. Similar to repeated fields,
+        there is no separate notion of presence: a "not present" repeated
+        extension is an empty list.
+    """
+    raise NotImplementedError
+
+  def ClearExtension(self, extension_handle):
+    """Clears the contents of a given extension.
+
+    Args:
+      extension_handle: The handle for the extension to clear.
+    """
+    raise NotImplementedError
+
+  def UnknownFields(self):
+    """Returns the UnknownFieldSet.
+
+    Returns:
+      UnknownFieldSet: The unknown fields stored in this message.
+    """
+    raise NotImplementedError
+
+  def DiscardUnknownFields(self):
+    """Clears all fields in the :class:`UnknownFieldSet`.
+
+    This operation is recursive for nested message.
+    """
+    raise NotImplementedError
+
+  def ByteSize(self):
+    """Returns the serialized size of this message.
+
+    Recursively calls ByteSize() on all contained messages.
+
+    Returns:
+      int: The number of bytes required to serialize this message.
+    """
+    raise NotImplementedError
+
+  @classmethod
+  def FromString(cls, s):
+    raise NotImplementedError
+
+  @staticmethod
+  def RegisterExtension(extension_handle):
+    raise NotImplementedError
+
+  def _SetListener(self, message_listener):
+    """Internal method used by the protocol message implementation.
+    Clients should not call this directly.
+
+    Sets a listener that this message will call on certain state transitions.
+
+    The purpose of this method is to register back-edges from children to
+    parents at runtime, for the purpose of setting "has" bits and
+    byte-size-dirty bits in the parent and ancestor objects whenever a child or
+    descendant object is modified.
+
+    If the client wants to disconnect this Message from the object tree, she
+    explicitly sets callback to None.
+
+    If message_listener is None, unregisters any existing listener.  Otherwise,
+    message_listener must implement the MessageListener interface in
+    internal/message_listener.py, and we discard any listener registered
+    via a previous _SetListener() call.
+    """
+    raise NotImplementedError
+
+  def __getstate__(self):
+    """Support the pickle protocol."""
+    return dict(serialized=self.SerializePartialToString())
+
+  def __setstate__(self, state):
+    """Support the pickle protocol."""
+    self.__init__()
+    serialized = state['serialized']
+    # On Python 3, using encoding='latin1' is required for unpickling
+    # protos pickled by Python 2.
+    if not isinstance(serialized, bytes):
+      serialized = serialized.encode('latin1')
+    self.ParseFromString(serialized)
+
+  def __reduce__(self):
+    message_descriptor = self.DESCRIPTOR
+    if message_descriptor.containing_type is None:
+      return type(self), (), self.__getstate__()
+    # the message type must be nested.
+    # Python does not pickle nested classes; use the symbol_database on the
+    # receiving end.
+    container = message_descriptor
+    return (_InternalConstructMessage, (container.full_name,),
+            self.__getstate__())
+
+
+def _InternalConstructMessage(full_name):
+  """Constructs a nested message."""
+  from google.protobuf import symbol_database  # pylint:disable=g-import-not-at-top
+
+  return symbol_database.Default().GetSymbol(full_name)()

lib/protobuf/message_factory.py

@@ -0,0 +1,185 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Provides a factory class for generating dynamic messages.
+
+The easiest way to use this class is if you have access to the FileDescriptor
+protos containing the messages you want to create you can just do the following:
+
+message_classes = message_factory.GetMessages(iterable_of_file_descriptors)
+my_proto_instance = message_classes['some.proto.package.MessageName']()
+"""
+
+__author__ = 'matthewtoia@google.com (Matt Toia)'
+
+from google.protobuf.internal import api_implementation
+from google.protobuf import descriptor_pool
+from google.protobuf import message
+
+if api_implementation.Type() == 'cpp':
+  from google.protobuf.pyext import cpp_message as message_impl
+else:
+  from google.protobuf.internal import python_message as message_impl
+
+
+# The type of all Message classes.
+_GENERATED_PROTOCOL_MESSAGE_TYPE = message_impl.GeneratedProtocolMessageType
+
+
+class MessageFactory(object):
+  """Factory for creating Proto2 messages from descriptors in a pool."""
+
+  def __init__(self, pool=None):
+    """Initializes a new factory."""
+    self.pool = pool or descriptor_pool.DescriptorPool()
+
+    # local cache of all classes built from protobuf descriptors
+    self._classes = {}
+
+  def GetPrototype(self, descriptor):
+    """Obtains a proto2 message class based on the passed in descriptor.
+
+    Passing a descriptor with a fully qualified name matching a previous
+    invocation will cause the same class to be returned.
+
+    Args:
+      descriptor: The descriptor to build from.
+
+    Returns:
+      A class describing the passed in descriptor.
+    """
+    if descriptor not in self._classes:
+      result_class = self.CreatePrototype(descriptor)
+      # The assignment to _classes is redundant for the base implementation, but
+      # might avoid confusion in cases where CreatePrototype gets overridden and
+      # does not call the base implementation.
+      self._classes[descriptor] = result_class
+      return result_class
+    return self._classes[descriptor]
+
+  def CreatePrototype(self, descriptor):
+    """Builds a proto2 message class based on the passed in descriptor.
+
+    Don't call this function directly, it always creates a new class. Call
+    GetPrototype() instead. This method is meant to be overridden in subblasses
+    to perform additional operations on the newly constructed class.
+
+    Args:
+      descriptor: The descriptor to build from.
+
+    Returns:
+      A class describing the passed in descriptor.
+    """
+    descriptor_name = descriptor.name
+    result_class = _GENERATED_PROTOCOL_MESSAGE_TYPE(
+        descriptor_name,
+        (message.Message,),
+        {
+            'DESCRIPTOR': descriptor,
+            # If module not set, it wrongly points to message_factory module.
+            '__module__': None,
+        })
+    result_class._FACTORY = self  # pylint: disable=protected-access
+    # Assign in _classes before doing recursive calls to avoid infinite
+    # recursion.
+    self._classes[descriptor] = result_class
+    for field in descriptor.fields:
+      if field.message_type:
+        self.GetPrototype(field.message_type)
+    for extension in result_class.DESCRIPTOR.extensions:
+      if extension.containing_type not in self._classes:
+        self.GetPrototype(extension.containing_type)
+      extended_class = self._classes[extension.containing_type]
+      extended_class.RegisterExtension(extension)
+    return result_class
+
+  def GetMessages(self, files):
+    """Gets all the messages from a specified file.
+
+    This will find and resolve dependencies, failing if the descriptor
+    pool cannot satisfy them.
+
+    Args:
+      files: The file names to extract messages from.
+
+    Returns:
+      A dictionary mapping proto names to the message classes. This will include
+      any dependent messages as well as any messages defined in the same file as
+      a specified message.
+    """
+    result = {}
+    for file_name in files:
+      file_desc = self.pool.FindFileByName(file_name)
+      for desc in file_desc.message_types_by_name.values():
+        result[desc.full_name] = self.GetPrototype(desc)
+
+      # While the extension FieldDescriptors are created by the descriptor pool,
+      # the python classes created in the factory need them to be registered
+      # explicitly, which is done below.
+      #
+      # The call to RegisterExtension will specifically check if the
+      # extension was already registered on the object and either
+      # ignore the registration if the original was the same, or raise
+      # an error if they were different.
+
+      for extension in file_desc.extensions_by_name.values():
+        if extension.containing_type not in self._classes:
+          self.GetPrototype(extension.containing_type)
+        extended_class = self._classes[extension.containing_type]
+        extended_class.RegisterExtension(extension)
+    return result
+
+
+_FACTORY = MessageFactory()
+
+
+def GetMessages(file_protos):
+  """Builds a dictionary of all the messages available in a set of files.
+
+  Args:
+    file_protos: Iterable of FileDescriptorProto to build messages out of.
+
+  Returns:
+    A dictionary mapping proto names to the message classes. This will include
+    any dependent messages as well as any messages defined in the same file as
+    a specified message.
+  """
+  # The cpp implementation of the protocol buffer library requires to add the
+  # message in topological order of the dependency graph.
+  file_by_name = {file_proto.name: file_proto for file_proto in file_protos}
+  def _AddFile(file_proto):
+    for dependency in file_proto.dependency:
+      if dependency in file_by_name:
+        # Remove from elements to be visited, in order to cut cycles.
+        _AddFile(file_by_name.pop(dependency))
+    _FACTORY.pool.Add(file_proto)
+  while file_by_name:
+    _AddFile(file_by_name.popitem()[1])
+  return _FACTORY.GetMessages([file_proto.name for file_proto in file_protos])

lib/protobuf/proto_builder.py

@@ -0,0 +1,134 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Dynamic Protobuf class creator."""
+
+from collections import OrderedDict
+import hashlib
+import os
+
+from google.protobuf import descriptor_pb2
+from google.protobuf import descriptor
+from google.protobuf import message_factory
+
+
+def _GetMessageFromFactory(factory, full_name):
+  """Get a proto class from the MessageFactory by name.
+
+  Args:
+    factory: a MessageFactory instance.
+    full_name: str, the fully qualified name of the proto type.
+  Returns:
+    A class, for the type identified by full_name.
+  Raises:
+    KeyError, if the proto is not found in the factory's descriptor pool.
+  """
+  proto_descriptor = factory.pool.FindMessageTypeByName(full_name)
+  proto_cls = factory.GetPrototype(proto_descriptor)
+  return proto_cls
+
+
+def MakeSimpleProtoClass(fields, full_name=None, pool=None):
+  """Create a Protobuf class whose fields are basic types.
+
+  Note: this doesn't validate field names!
+
+  Args:
+    fields: dict of {name: field_type} mappings for each field in the proto. If
+        this is an OrderedDict the order will be maintained, otherwise the
+        fields will be sorted by name.
+    full_name: optional str, the fully-qualified name of the proto type.
+    pool: optional DescriptorPool instance.
+  Returns:
+    a class, the new protobuf class with a FileDescriptor.
+  """
+  factory = message_factory.MessageFactory(pool=pool)
+
+  if full_name is not None:
+    try:
+      proto_cls = _GetMessageFromFactory(factory, full_name)
+      return proto_cls
+    except KeyError:
+      # The factory's DescriptorPool doesn't know about this class yet.
+      pass
+
+  # Get a list of (name, field_type) tuples from the fields dict. If fields was
+  # an OrderedDict we keep the order, but otherwise we sort the field to ensure
+  # consistent ordering.
+  field_items = fields.items()
+  if not isinstance(fields, OrderedDict):
+    field_items = sorted(field_items)
+
+  # Use a consistent file name that is unlikely to conflict with any imported
+  # proto files.
+  fields_hash = hashlib.sha1()
+  for f_name, f_type in field_items:
+    fields_hash.update(f_name.encode('utf-8'))
+    fields_hash.update(str(f_type).encode('utf-8'))
+  proto_file_name = fields_hash.hexdigest() + '.proto'
+
+  # If the proto is anonymous, use the same hash to name it.
+  if full_name is None:
+    full_name = ('net.proto2.python.public.proto_builder.AnonymousProto_' +
+                 fields_hash.hexdigest())
+    try:
+      proto_cls = _GetMessageFromFactory(factory, full_name)
+      return proto_cls
+    except KeyError:
+      # The factory's DescriptorPool doesn't know about this class yet.
+      pass
+
+  # This is the first time we see this proto: add a new descriptor to the pool.
+  factory.pool.Add(
+      _MakeFileDescriptorProto(proto_file_name, full_name, field_items))
+  return _GetMessageFromFactory(factory, full_name)
+
+
+def _MakeFileDescriptorProto(proto_file_name, full_name, field_items):
+  """Populate FileDescriptorProto for MessageFactory's DescriptorPool."""
+  package, name = full_name.rsplit('.', 1)
+  file_proto = descriptor_pb2.FileDescriptorProto()
+  file_proto.name = os.path.join(package.replace('.', '/'), proto_file_name)
+  file_proto.package = package
+  desc_proto = file_proto.message_type.add()
+  desc_proto.name = name
+  for f_number, (f_name, f_type) in enumerate(field_items, 1):
+    field_proto = desc_proto.field.add()
+    field_proto.name = f_name
+    # # If the number falls in the reserved range, reassign it to the correct
+    # # number after the range.
+    if f_number >= descriptor.FieldDescriptor.FIRST_RESERVED_FIELD_NUMBER:
+      f_number += (
+          descriptor.FieldDescriptor.LAST_RESERVED_FIELD_NUMBER -
+          descriptor.FieldDescriptor.FIRST_RESERVED_FIELD_NUMBER + 1)
+    field_proto.number = f_number
+    field_proto.label = descriptor_pb2.FieldDescriptorProto.LABEL_OPTIONAL
+    field_proto.type = f_type
+  return file_proto

lib/protobuf/pyext/cpp_message.py

@@ -0,0 +1,65 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Protocol message implementation hooks for C++ implementation.
+
+Contains helper functions used to create protocol message classes from
+Descriptor objects at runtime backed by the protocol buffer C++ API.
+"""
+
+__author__ = 'tibell@google.com (Johan Tibell)'
+
+from google.protobuf.pyext import _message
+
+
+class GeneratedProtocolMessageType(_message.MessageMeta):
+
+  """Metaclass for protocol message classes created at runtime from Descriptors.
+
+  The protocol compiler currently uses this metaclass to create protocol
+  message classes at runtime.  Clients can also manually create their own
+  classes at runtime, as in this example:
+
+  mydescriptor = Descriptor(.....)
+  factory = symbol_database.Default()
+  factory.pool.AddDescriptor(mydescriptor)
+  MyProtoClass = factory.GetPrototype(mydescriptor)
+  myproto_instance = MyProtoClass()
+  myproto.foo_field = 23
+  ...
+
+  The above example will not work for nested types. If you wish to include them,
+  use reflection.MakeClass() instead of manually instantiating the class in
+  order to create the appropriate class structure.
+  """
+
+  # Must be consistent with the protocol-compiler code in
+  # proto2/compiler/internal/generator.*.
+  _DESCRIPTOR_KEY = 'DESCRIPTOR'

lib/protobuf/reflection.py

@@ -0,0 +1,95 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# This code is meant to work on Python 2.4 and above only.
+
+"""Contains a metaclass and helper functions used to create
+protocol message classes from Descriptor objects at runtime.
+
+Recall that a metaclass is the "type" of a class.
+(A class is to a metaclass what an instance is to a class.)
+
+In this case, we use the GeneratedProtocolMessageType metaclass
+to inject all the useful functionality into the classes
+output by the protocol compiler at compile-time.
+
+The upshot of all this is that the real implementation
+details for ALL pure-Python protocol buffers are *here in
+this file*.
+"""
+
+__author__ = 'robinson@google.com (Will Robinson)'
+
+
+from google.protobuf import message_factory
+from google.protobuf import symbol_database
+
+# The type of all Message classes.
+# Part of the public interface, but normally only used by message factories.
+GeneratedProtocolMessageType = message_factory._GENERATED_PROTOCOL_MESSAGE_TYPE
+
+MESSAGE_CLASS_CACHE = {}
+
+
+# Deprecated. Please NEVER use reflection.ParseMessage().
+def ParseMessage(descriptor, byte_str):
+  """Generate a new Message instance from this Descriptor and a byte string.
+
+  DEPRECATED: ParseMessage is deprecated because it is using MakeClass().
+  Please use MessageFactory.GetPrototype() instead.
+
+  Args:
+    descriptor: Protobuf Descriptor object
+    byte_str: Serialized protocol buffer byte string
+
+  Returns:
+    Newly created protobuf Message object.
+  """
+  result_class = MakeClass(descriptor)
+  new_msg = result_class()
+  new_msg.ParseFromString(byte_str)
+  return new_msg
+
+
+# Deprecated. Please NEVER use reflection.MakeClass().
+def MakeClass(descriptor):
+  """Construct a class object for a protobuf described by descriptor.
+
+  DEPRECATED: use MessageFactory.GetPrototype() instead.
+
+  Args:
+    descriptor: A descriptor.Descriptor object describing the protobuf.
+  Returns:
+    The Message class object described by the descriptor.
+  """
+  # Original implementation leads to duplicate message classes, which won't play
+  # well with extensions. Message factory info is also missing.
+  # Redirect to message_factory.
+  return symbol_database.Default().GetPrototype(descriptor)

lib/protobuf/service.py

@@ -0,0 +1,228 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""DEPRECATED:  Declares the RPC service interfaces.
+
+This module declares the abstract interfaces underlying proto2 RPC
+services.  These are intended to be independent of any particular RPC
+implementation, so that proto2 services can be used on top of a variety
+of implementations.  Starting with version 2.3.0, RPC implementations should
+not try to build on these, but should instead provide code generator plugins
+which generate code specific to the particular RPC implementation.  This way
+the generated code can be more appropriate for the implementation in use
+and can avoid unnecessary layers of indirection.
+"""
+
+__author__ = 'petar@google.com (Petar Petrov)'
+
+
+class RpcException(Exception):
+  """Exception raised on failed blocking RPC method call."""
+  pass
+
+
+class Service(object):
+
+  """Abstract base interface for protocol-buffer-based RPC services.
+
+  Services themselves are abstract classes (implemented either by servers or as
+  stubs), but they subclass this base interface. The methods of this
+  interface can be used to call the methods of the service without knowing
+  its exact type at compile time (analogous to the Message interface).
+  """
+
+  def GetDescriptor():
+    """Retrieves this service's descriptor."""
+    raise NotImplementedError
+
+  def CallMethod(self, method_descriptor, rpc_controller,
+                 request, done):
+    """Calls a method of the service specified by method_descriptor.
+
+    If "done" is None then the call is blocking and the response
+    message will be returned directly.  Otherwise the call is asynchronous
+    and "done" will later be called with the response value.
+
+    In the blocking case, RpcException will be raised on error.
+
+    Preconditions:
+
+    * method_descriptor.service == GetDescriptor
+    * request is of the exact same classes as returned by
+      GetRequestClass(method).
+    * After the call has started, the request must not be modified.
+    * "rpc_controller" is of the correct type for the RPC implementation being
+      used by this Service.  For stubs, the "correct type" depends on the
+      RpcChannel which the stub is using.
+
+    Postconditions:
+
+    * "done" will be called when the method is complete.  This may be
+      before CallMethod() returns or it may be at some point in the future.
+    * If the RPC failed, the response value passed to "done" will be None.
+      Further details about the failure can be found by querying the
+      RpcController.
+    """
+    raise NotImplementedError
+
+  def GetRequestClass(self, method_descriptor):
+    """Returns the class of the request message for the specified method.
+
+    CallMethod() requires that the request is of a particular subclass of
+    Message. GetRequestClass() gets the default instance of this required
+    type.
+
+    Example:
+      method = service.GetDescriptor().FindMethodByName("Foo")
+      request = stub.GetRequestClass(method)()
+      request.ParseFromString(input)
+      service.CallMethod(method, request, callback)
+    """
+    raise NotImplementedError
+
+  def GetResponseClass(self, method_descriptor):
+    """Returns the class of the response message for the specified method.
+
+    This method isn't really needed, as the RpcChannel's CallMethod constructs
+    the response protocol message. It's provided anyway in case it is useful
+    for the caller to know the response type in advance.
+    """
+    raise NotImplementedError
+
+
+class RpcController(object):
+
+  """An RpcController mediates a single method call.
+
+  The primary purpose of the controller is to provide a way to manipulate
+  settings specific to the RPC implementation and to find out about RPC-level
+  errors. The methods provided by the RpcController interface are intended
+  to be a "least common denominator" set of features which we expect all
+  implementations to support.  Specific implementations may provide more
+  advanced features (e.g. deadline propagation).
+  """
+
+  # Client-side methods below
+
+  def Reset(self):
+    """Resets the RpcController to its initial state.
+
+    After the RpcController has been reset, it may be reused in
+    a new call. Must not be called while an RPC is in progress.
+    """
+    raise NotImplementedError
+
+  def Failed(self):
+    """Returns true if the call failed.
+
+    After a call has finished, returns true if the call failed.  The possible
+    reasons for failure depend on the RPC implementation.  Failed() must not
+    be called before a call has finished.  If Failed() returns true, the
+    contents of the response message are undefined.
+    """
+    raise NotImplementedError
+
+  def ErrorText(self):
+    """If Failed is true, returns a human-readable description of the error."""
+    raise NotImplementedError
+
+  def StartCancel(self):
+    """Initiate cancellation.
+
+    Advises the RPC system that the caller desires that the RPC call be
+    canceled.  The RPC system may cancel it immediately, may wait awhile and
+    then cancel it, or may not even cancel the call at all.  If the call is
+    canceled, the "done" callback will still be called and the RpcController
+    will indicate that the call failed at that time.
+    """
+    raise NotImplementedError
+
+  # Server-side methods below
+
+  def SetFailed(self, reason):
+    """Sets a failure reason.
+
+    Causes Failed() to return true on the client side.  "reason" will be
+    incorporated into the message returned by ErrorText().  If you find
+    you need to return machine-readable information about failures, you
+    should incorporate it into your response protocol buffer and should
+    NOT call SetFailed().
+    """
+    raise NotImplementedError
+
+  def IsCanceled(self):
+    """Checks if the client cancelled the RPC.
+
+    If true, indicates that the client canceled the RPC, so the server may
+    as well give up on replying to it.  The server should still call the
+    final "done" callback.
+    """
+    raise NotImplementedError
+
+  def NotifyOnCancel(self, callback):
+    """Sets a callback to invoke on cancel.
+
+    Asks that the given callback be called when the RPC is canceled.  The
+    callback will always be called exactly once.  If the RPC completes without
+    being canceled, the callback will be called after completion.  If the RPC
+    has already been canceled when NotifyOnCancel() is called, the callback
+    will be called immediately.
+
+    NotifyOnCancel() must be called no more than once per request.
+    """
+    raise NotImplementedError
+
+
+class RpcChannel(object):
+
+  """Abstract interface for an RPC channel.
+
+  An RpcChannel represents a communication line to a service which can be used
+  to call that service's methods.  The service may be running on another
+  machine. Normally, you should not use an RpcChannel directly, but instead
+  construct a stub {@link Service} wrapping it.  Example:
+
+  Example:
+    RpcChannel channel = rpcImpl.Channel("remotehost.example.com:1234")
+    RpcController controller = rpcImpl.Controller()
+    MyService service = MyService_Stub(channel)
+    service.MyMethod(controller, request, callback)
+  """
+
+  def CallMethod(self, method_descriptor, rpc_controller,
+                 request, response_class, done):
+    """Calls the method identified by the descriptor.
+
+    Call the given method of the remote service.  The signature of this
+    procedure looks the same as Service.CallMethod(), but the requirements
+    are less strict in one important way:  the request object doesn't have to
+    be of any specific class as long as its descriptor is method.input_type.
+    """
+    raise NotImplementedError

lib/protobuf/service_reflection.py

@@ -0,0 +1,295 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Contains metaclasses used to create protocol service and service stub
+classes from ServiceDescriptor objects at runtime.
+
+The GeneratedServiceType and GeneratedServiceStubType metaclasses are used to
+inject all useful functionality into the classes output by the protocol
+compiler at compile-time.
+"""
+
+__author__ = 'petar@google.com (Petar Petrov)'
+
+
+class GeneratedServiceType(type):
+
+  """Metaclass for service classes created at runtime from ServiceDescriptors.
+
+  Implementations for all methods described in the Service class are added here
+  by this class. We also create properties to allow getting/setting all fields
+  in the protocol message.
+
+  The protocol compiler currently uses this metaclass to create protocol service
+  classes at runtime. Clients can also manually create their own classes at
+  runtime, as in this example::
+
+    mydescriptor = ServiceDescriptor(.....)
+    class MyProtoService(service.Service):
+      __metaclass__ = GeneratedServiceType
+      DESCRIPTOR = mydescriptor
+    myservice_instance = MyProtoService()
+    # ...
+  """
+
+  _DESCRIPTOR_KEY = 'DESCRIPTOR'
+
+  def __init__(cls, name, bases, dictionary):
+    """Creates a message service class.
+
+    Args:
+      name: Name of the class (ignored, but required by the metaclass
+        protocol).
+      bases: Base classes of the class being constructed.
+      dictionary: The class dictionary of the class being constructed.
+        dictionary[_DESCRIPTOR_KEY] must contain a ServiceDescriptor object
+        describing this protocol service type.
+    """
+    # Don't do anything if this class doesn't have a descriptor. This happens
+    # when a service class is subclassed.
+    if GeneratedServiceType._DESCRIPTOR_KEY not in dictionary:
+      return
+
+    descriptor = dictionary[GeneratedServiceType._DESCRIPTOR_KEY]
+    service_builder = _ServiceBuilder(descriptor)
+    service_builder.BuildService(cls)
+    cls.DESCRIPTOR = descriptor
+
+
+class GeneratedServiceStubType(GeneratedServiceType):
+
+  """Metaclass for service stubs created at runtime from ServiceDescriptors.
+
+  This class has similar responsibilities as GeneratedServiceType, except that
+  it creates the service stub classes.
+  """
+
+  _DESCRIPTOR_KEY = 'DESCRIPTOR'
+
+  def __init__(cls, name, bases, dictionary):
+    """Creates a message service stub class.
+
+    Args:
+      name: Name of the class (ignored, here).
+      bases: Base classes of the class being constructed.
+      dictionary: The class dictionary of the class being constructed.
+        dictionary[_DESCRIPTOR_KEY] must contain a ServiceDescriptor object
+        describing this protocol service type.
+    """
+    super(GeneratedServiceStubType, cls).__init__(name, bases, dictionary)
+    # Don't do anything if this class doesn't have a descriptor. This happens
+    # when a service stub is subclassed.
+    if GeneratedServiceStubType._DESCRIPTOR_KEY not in dictionary:
+      return
+
+    descriptor = dictionary[GeneratedServiceStubType._DESCRIPTOR_KEY]
+    service_stub_builder = _ServiceStubBuilder(descriptor)
+    service_stub_builder.BuildServiceStub(cls)
+
+
+class _ServiceBuilder(object):
+
+  """This class constructs a protocol service class using a service descriptor.
+
+  Given a service descriptor, this class constructs a class that represents
+  the specified service descriptor. One service builder instance constructs
+  exactly one service class. That means all instances of that class share the
+  same builder.
+  """
+
+  def __init__(self, service_descriptor):
+    """Initializes an instance of the service class builder.
+
+    Args:
+      service_descriptor: ServiceDescriptor to use when constructing the
+        service class.
+    """
+    self.descriptor = service_descriptor
+
+  def BuildService(builder, cls):
+    """Constructs the service class.
+
+    Args:
+      cls: The class that will be constructed.
+    """
+
+    # CallMethod needs to operate with an instance of the Service class. This
+    # internal wrapper function exists only to be able to pass the service
+    # instance to the method that does the real CallMethod work.
+    # Making sure to use exact argument names from the abstract interface in
+    # service.py to match the type signature
+    def _WrapCallMethod(self, method_descriptor, rpc_controller, request, done):
+      return builder._CallMethod(self, method_descriptor, rpc_controller,
+                                 request, done)
+
+    def _WrapGetRequestClass(self, method_descriptor):
+      return builder._GetRequestClass(method_descriptor)
+
+    def _WrapGetResponseClass(self, method_descriptor):
+      return builder._GetResponseClass(method_descriptor)
+
+    builder.cls = cls
+    cls.CallMethod = _WrapCallMethod
+    cls.GetDescriptor = staticmethod(lambda: builder.descriptor)
+    cls.GetDescriptor.__doc__ = 'Returns the service descriptor.'
+    cls.GetRequestClass = _WrapGetRequestClass
+    cls.GetResponseClass = _WrapGetResponseClass
+    for method in builder.descriptor.methods:
+      setattr(cls, method.name, builder._GenerateNonImplementedMethod(method))
+
+  def _CallMethod(self, srvc, method_descriptor,
+                  rpc_controller, request, callback):
+    """Calls the method described by a given method descriptor.
+
+    Args:
+      srvc: Instance of the service for which this method is called.
+      method_descriptor: Descriptor that represent the method to call.
+      rpc_controller: RPC controller to use for this method's execution.
+      request: Request protocol message.
+      callback: A callback to invoke after the method has completed.
+    """
+    if method_descriptor.containing_service != self.descriptor:
+      raise RuntimeError(
+          'CallMethod() given method descriptor for wrong service type.')
+    method = getattr(srvc, method_descriptor.name)
+    return method(rpc_controller, request, callback)
+
+  def _GetRequestClass(self, method_descriptor):
+    """Returns the class of the request protocol message.
+
+    Args:
+      method_descriptor: Descriptor of the method for which to return the
+        request protocol message class.
+
+    Returns:
+      A class that represents the input protocol message of the specified
+      method.
+    """
+    if method_descriptor.containing_service != self.descriptor:
+      raise RuntimeError(
+          'GetRequestClass() given method descriptor for wrong service type.')
+    return method_descriptor.input_type._concrete_class
+
+  def _GetResponseClass(self, method_descriptor):
+    """Returns the class of the response protocol message.
+
+    Args:
+      method_descriptor: Descriptor of the method for which to return the
+        response protocol message class.
+
+    Returns:
+      A class that represents the output protocol message of the specified
+      method.
+    """
+    if method_descriptor.containing_service != self.descriptor:
+      raise RuntimeError(
+          'GetResponseClass() given method descriptor for wrong service type.')
+    return method_descriptor.output_type._concrete_class
+
+  def _GenerateNonImplementedMethod(self, method):
+    """Generates and returns a method that can be set for a service methods.
+
+    Args:
+      method: Descriptor of the service method for which a method is to be
+        generated.
+
+    Returns:
+      A method that can be added to the service class.
+    """
+    return lambda inst, rpc_controller, request, callback: (
+        self._NonImplementedMethod(method.name, rpc_controller, callback))
+
+  def _NonImplementedMethod(self, method_name, rpc_controller, callback):
+    """The body of all methods in the generated service class.
+
+    Args:
+      method_name: Name of the method being executed.
+      rpc_controller: RPC controller used to execute this method.
+      callback: A callback which will be invoked when the method finishes.
+    """
+    rpc_controller.SetFailed('Method %s not implemented.' % method_name)
+    callback(None)
+
+
+class _ServiceStubBuilder(object):
+
+  """Constructs a protocol service stub class using a service descriptor.
+
+  Given a service descriptor, this class constructs a suitable stub class.
+  A stub is just a type-safe wrapper around an RpcChannel which emulates a
+  local implementation of the service.
+
+  One service stub builder instance constructs exactly one class. It means all
+  instances of that class share the same service stub builder.
+  """
+
+  def __init__(self, service_descriptor):
+    """Initializes an instance of the service stub class builder.
+
+    Args:
+      service_descriptor: ServiceDescriptor to use when constructing the
+        stub class.
+    """
+    self.descriptor = service_descriptor
+
+  def BuildServiceStub(self, cls):
+    """Constructs the stub class.
+
+    Args:
+      cls: The class that will be constructed.
+    """
+
+    def _ServiceStubInit(stub, rpc_channel):
+      stub.rpc_channel = rpc_channel
+    self.cls = cls
+    cls.__init__ = _ServiceStubInit
+    for method in self.descriptor.methods:
+      setattr(cls, method.name, self._GenerateStubMethod(method))
+
+  def _GenerateStubMethod(self, method):
+    return (lambda inst, rpc_controller, request, callback=None:
+        self._StubMethod(inst, method, rpc_controller, request, callback))
+
+  def _StubMethod(self, stub, method_descriptor,
+                  rpc_controller, request, callback):
+    """The body of all service methods in the generated stub class.
+
+    Args:
+      stub: Stub instance.
+      method_descriptor: Descriptor of the invoked method.
+      rpc_controller: Rpc controller to execute the method.
+      request: Request protocol message.
+      callback: A callback to execute when the method finishes.
+    Returns:
+      Response message (in case of blocking call).
+    """
+    return stub.rpc_channel.CallMethod(
+        method_descriptor, rpc_controller, request,
+        method_descriptor.output_type._concrete_class, callback)

lib/protobuf/source_context_pb2.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/source_context.proto
+"""Generated protocol buffer code."""
+from google.protobuf.internal import builder as _builder
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import descriptor_pool as _descriptor_pool
+from google.protobuf import symbol_database as _symbol_database
+# @@protoc_insertion_point(imports)
+
+_sym_db = _symbol_database.Default()
+
+
+
+
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n$google/protobuf/source_context.proto\x12\x0fgoogle.protobuf\"\"\n\rSourceContext\x12\x11\n\tfile_name\x18\x01 \x01(\tB\x8a\x01\n\x13\x63om.google.protobufB\x12SourceContextProtoP\x01Z6google.golang.org/protobuf/types/known/sourcecontextpb\xa2\x02\x03GPB\xaa\x02\x1eGoogle.Protobuf.WellKnownTypesb\x06proto3')
+
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'google.protobuf.source_context_pb2', globals())
+if _descriptor._USE_C_DESCRIPTORS == False:
+
+  DESCRIPTOR._options = None
+  DESCRIPTOR._serialized_options = b'\n\023com.google.protobufB\022SourceContextProtoP\001Z6google.golang.org/protobuf/types/known/sourcecontextpb\242\002\003GPB\252\002\036Google.Protobuf.WellKnownTypes'
+  _SOURCECONTEXT._serialized_start=57
+  _SOURCECONTEXT._serialized_end=91
+# @@protoc_insertion_point(module_scope)

lib/protobuf/struct_pb2.py

@@ -0,0 +1,36 @@
+# -*- coding: utf-8 -*-
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/struct.proto
+"""Generated protocol buffer code."""
+from google.protobuf.internal import builder as _builder
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import descriptor_pool as _descriptor_pool
+from google.protobuf import symbol_database as _symbol_database
+# @@protoc_insertion_point(imports)
+
+_sym_db = _symbol_database.Default()
+
+
+
+
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x1cgoogle/protobuf/struct.proto\x12\x0fgoogle.protobuf\"\x84\x01\n\x06Struct\x12\x33\n\x06\x66ields\x18\x01 \x03(\x0b\x32#.google.protobuf.Struct.FieldsEntry\x1a\x45\n\x0b\x46ieldsEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12%\n\x05value\x18\x02 \x01(\x0b\x32\x16.google.protobuf.Value:\x02\x38\x01\"\xea\x01\n\x05Value\x12\x30\n\nnull_value\x18\x01 \x01(\x0e\x32\x1a.google.protobuf.NullValueH\x00\x12\x16\n\x0cnumber_value\x18\x02 \x01(\x01H\x00\x12\x16\n\x0cstring_value\x18\x03 \x01(\tH\x00\x12\x14\n\nbool_value\x18\x04 \x01(\x08H\x00\x12/\n\x0cstruct_value\x18\x05 \x01(\x0b\x32\x17.google.protobuf.StructH\x00\x12\x30\n\nlist_value\x18\x06 \x01(\x0b\x32\x1a.google.protobuf.ListValueH\x00\x42\x06\n\x04kind\"3\n\tListValue\x12&\n\x06values\x18\x01 \x03(\x0b\x32\x16.google.protobuf.Value*\x1b\n\tNullValue\x12\x0e\n\nNULL_VALUE\x10\x00\x42\x7f\n\x13\x63om.google.protobufB\x0bStructProtoP\x01Z/google.golang.org/protobuf/types/known/structpb\xf8\x01\x01\xa2\x02\x03GPB\xaa\x02\x1eGoogle.Protobuf.WellKnownTypesb\x06proto3')
+
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'google.protobuf.struct_pb2', globals())
+if _descriptor._USE_C_DESCRIPTORS == False:
+
+  DESCRIPTOR._options = None
+  DESCRIPTOR._serialized_options = b'\n\023com.google.protobufB\013StructProtoP\001Z/google.golang.org/protobuf/types/known/structpb\370\001\001\242\002\003GPB\252\002\036Google.Protobuf.WellKnownTypes'
+  _STRUCT_FIELDSENTRY._options = None
+  _STRUCT_FIELDSENTRY._serialized_options = b'8\001'
+  _NULLVALUE._serialized_start=474
+  _NULLVALUE._serialized_end=501
+  _STRUCT._serialized_start=50
+  _STRUCT._serialized_end=182
+  _STRUCT_FIELDSENTRY._serialized_start=113
+  _STRUCT_FIELDSENTRY._serialized_end=182
+  _VALUE._serialized_start=185
+  _VALUE._serialized_end=419
+  _LISTVALUE._serialized_start=421
+  _LISTVALUE._serialized_end=472
+# @@protoc_insertion_point(module_scope)

lib/protobuf/symbol_database.py

@@ -0,0 +1,194 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""A database of Python protocol buffer generated symbols.
+
+SymbolDatabase is the MessageFactory for messages generated at compile time,
+and makes it easy to create new instances of a registered type, given only the
+type's protocol buffer symbol name.
+
+Example usage::
+
+  db = symbol_database.SymbolDatabase()
+
+  # Register symbols of interest, from one or multiple files.
+  db.RegisterFileDescriptor(my_proto_pb2.DESCRIPTOR)
+  db.RegisterMessage(my_proto_pb2.MyMessage)
+  db.RegisterEnumDescriptor(my_proto_pb2.MyEnum.DESCRIPTOR)
+
+  # The database can be used as a MessageFactory, to generate types based on
+  # their name:
+  types = db.GetMessages(['my_proto.proto'])
+  my_message_instance = types['MyMessage']()
+
+  # The database's underlying descriptor pool can be queried, so it's not
+  # necessary to know a type's filename to be able to generate it:
+  filename = db.pool.FindFileContainingSymbol('MyMessage')
+  my_message_instance = db.GetMessages([filename])['MyMessage']()
+
+  # This functionality is also provided directly via a convenience method:
+  my_message_instance = db.GetSymbol('MyMessage')()
+"""
+
+
+from google.protobuf.internal import api_implementation
+from google.protobuf import descriptor_pool
+from google.protobuf import message_factory
+
+
+class SymbolDatabase(message_factory.MessageFactory):
+  """A database of Python generated symbols."""
+
+  def RegisterMessage(self, message):
+    """Registers the given message type in the local database.
+
+    Calls to GetSymbol() and GetMessages() will return messages registered here.
+
+    Args:
+      message: A :class:`google.protobuf.message.Message` subclass (or
+        instance); its descriptor will be registered.
+
+    Returns:
+      The provided message.
+    """
+
+    desc = message.DESCRIPTOR
+    self._classes[desc] = message
+    self.RegisterMessageDescriptor(desc)
+    return message
+
+  def RegisterMessageDescriptor(self, message_descriptor):
+    """Registers the given message descriptor in the local database.
+
+    Args:
+      message_descriptor (Descriptor): the message descriptor to add.
+    """
+    if api_implementation.Type() == 'python':
+      # pylint: disable=protected-access
+      self.pool._AddDescriptor(message_descriptor)
+
+  def RegisterEnumDescriptor(self, enum_descriptor):
+    """Registers the given enum descriptor in the local database.
+
+    Args:
+      enum_descriptor (EnumDescriptor): The enum descriptor to register.
+
+    Returns:
+      EnumDescriptor: The provided descriptor.
+    """
+    if api_implementation.Type() == 'python':
+      # pylint: disable=protected-access
+      self.pool._AddEnumDescriptor(enum_descriptor)
+    return enum_descriptor
+
+  def RegisterServiceDescriptor(self, service_descriptor):
+    """Registers the given service descriptor in the local database.
+
+    Args:
+      service_descriptor (ServiceDescriptor): the service descriptor to
+        register.
+    """
+    if api_implementation.Type() == 'python':
+      # pylint: disable=protected-access
+      self.pool._AddServiceDescriptor(service_descriptor)
+
+  def RegisterFileDescriptor(self, file_descriptor):
+    """Registers the given file descriptor in the local database.
+
+    Args:
+      file_descriptor (FileDescriptor): The file descriptor to register.
+    """
+    if api_implementation.Type() == 'python':
+      # pylint: disable=protected-access
+      self.pool._InternalAddFileDescriptor(file_descriptor)
+
+  def GetSymbol(self, symbol):
+    """Tries to find a symbol in the local database.
+
+    Currently, this method only returns message.Message instances, however, if
+    may be extended in future to support other symbol types.
+
+    Args:
+      symbol (str): a protocol buffer symbol.
+
+    Returns:
+      A Python class corresponding to the symbol.
+
+    Raises:
+      KeyError: if the symbol could not be found.
+    """
+
+    return self._classes[self.pool.FindMessageTypeByName(symbol)]
+
+  def GetMessages(self, files):
+    # TODO(amauryfa): Fix the differences with MessageFactory.
+    """Gets all registered messages from a specified file.
+
+    Only messages already created and registered will be returned; (this is the
+    case for imported _pb2 modules)
+    But unlike MessageFactory, this version also returns already defined nested
+    messages, but does not register any message extensions.
+
+    Args:
+      files (list[str]): The file names to extract messages from.
+
+    Returns:
+      A dictionary mapping proto names to the message classes.
+
+    Raises:
+      KeyError: if a file could not be found.
+    """
+
+    def _GetAllMessages(desc):
+      """Walk a message Descriptor and recursively yields all message names."""
+      yield desc
+      for msg_desc in desc.nested_types:
+        for nested_desc in _GetAllMessages(msg_desc):
+          yield nested_desc
+
+    result = {}
+    for file_name in files:
+      file_desc = self.pool.FindFileByName(file_name)
+      for msg_desc in file_desc.message_types_by_name.values():
+        for desc in _GetAllMessages(msg_desc):
+          try:
+            result[desc.full_name] = self._classes[desc]
+          except KeyError:
+            # This descriptor has no registered class, skip it.
+            pass
+    return result
+
+
+_DEFAULT = SymbolDatabase(pool=descriptor_pool.Default())
+
+
+def Default():
+  """Returns the default SymbolDatabase."""
+  return _DEFAULT

lib/protobuf/text_encoding.py

@@ -0,0 +1,110 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Encoding related utilities."""
+import re
+
+_cescape_chr_to_symbol_map = {}
+_cescape_chr_to_symbol_map[9] = r'\t'  # optional escape
+_cescape_chr_to_symbol_map[10] = r'\n'  # optional escape
+_cescape_chr_to_symbol_map[13] = r'\r'  # optional escape
+_cescape_chr_to_symbol_map[34] = r'\"'  # necessary escape
+_cescape_chr_to_symbol_map[39] = r"\'"  # optional escape
+_cescape_chr_to_symbol_map[92] = r'\\'  # necessary escape
+
+# Lookup table for unicode
+_cescape_unicode_to_str = [chr(i) for i in range(0, 256)]
+for byte, string in _cescape_chr_to_symbol_map.items():
+  _cescape_unicode_to_str[byte] = string
+
+# Lookup table for non-utf8, with necessary escapes at (o >= 127 or o < 32)
+_cescape_byte_to_str = ([r'\%03o' % i for i in range(0, 32)] +
+                        [chr(i) for i in range(32, 127)] +
+                        [r'\%03o' % i for i in range(127, 256)])
+for byte, string in _cescape_chr_to_symbol_map.items():
+  _cescape_byte_to_str[byte] = string
+del byte, string
+
+
+def CEscape(text, as_utf8):
+  # type: (...) -> str
+  """Escape a bytes string for use in an text protocol buffer.
+
+  Args:
+    text: A byte string to be escaped.
+    as_utf8: Specifies if result may contain non-ASCII characters.
+        In Python 3 this allows unescaped non-ASCII Unicode characters.
+        In Python 2 the return value will be valid UTF-8 rather than only ASCII.
+  Returns:
+    Escaped string (str).
+  """
+  # Python's text.encode() 'string_escape' or 'unicode_escape' codecs do not
+  # satisfy our needs; they encodes unprintable characters using two-digit hex
+  # escapes whereas our C++ unescaping function allows hex escapes to be any
+  # length.  So, "\0011".encode('string_escape') ends up being "\\x011", which
+  # will be decoded in C++ as a single-character string with char code 0x11.
+  text_is_unicode = isinstance(text, str)
+  if as_utf8 and text_is_unicode:
+    # We're already unicode, no processing beyond control char escapes.
+    return text.translate(_cescape_chr_to_symbol_map)
+  ord_ = ord if text_is_unicode else lambda x: x  # bytes iterate as ints.
+  if as_utf8:
+    return ''.join(_cescape_unicode_to_str[ord_(c)] for c in text)
+  return ''.join(_cescape_byte_to_str[ord_(c)] for c in text)
+
+
+_CUNESCAPE_HEX = re.compile(r'(\\+)x([0-9a-fA-F])(?![0-9a-fA-F])')
+
+
+def CUnescape(text):
+  # type: (str) -> bytes
+  """Unescape a text string with C-style escape sequences to UTF-8 bytes.
+
+  Args:
+    text: The data to parse in a str.
+  Returns:
+    A byte string.
+  """
+
+  def ReplaceHex(m):
+    # Only replace the match if the number of leading back slashes is odd. i.e.
+    # the slash itself is not escaped.
+    if len(m.group(1)) & 1:
+      return m.group(1) + 'x0' + m.group(2)
+    return m.group(0)
+
+  # This is required because the 'string_escape' encoding doesn't
+  # allow single-digit hex escapes (like '\xf').
+  result = _CUNESCAPE_HEX.sub(ReplaceHex, text)
+
+  return (result.encode('utf-8')  # Make it bytes to allow decode.
+          .decode('unicode_escape')
+          # Make it bytes again to return the proper type.
+          .encode('raw_unicode_escape'))

lib/protobuf/timestamp_pb2.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/timestamp.proto
+"""Generated protocol buffer code."""
+from google.protobuf.internal import builder as _builder
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import descriptor_pool as _descriptor_pool
+from google.protobuf import symbol_database as _symbol_database
+# @@protoc_insertion_point(imports)
+
+_sym_db = _symbol_database.Default()
+
+
+
+
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x1fgoogle/protobuf/timestamp.proto\x12\x0fgoogle.protobuf\"+\n\tTimestamp\x12\x0f\n\x07seconds\x18\x01 \x01(\x03\x12\r\n\x05nanos\x18\x02 \x01(\x05\x42\x85\x01\n\x13\x63om.google.protobufB\x0eTimestampProtoP\x01Z2google.golang.org/protobuf/types/known/timestamppb\xf8\x01\x01\xa2\x02\x03GPB\xaa\x02\x1eGoogle.Protobuf.WellKnownTypesb\x06proto3')
+
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'google.protobuf.timestamp_pb2', globals())
+if _descriptor._USE_C_DESCRIPTORS == False:
+
+  DESCRIPTOR._options = None
+  DESCRIPTOR._serialized_options = b'\n\023com.google.protobufB\016TimestampProtoP\001Z2google.golang.org/protobuf/types/known/timestamppb\370\001\001\242\002\003GPB\252\002\036Google.Protobuf.WellKnownTypes'
+  _TIMESTAMP._serialized_start=52
+  _TIMESTAMP._serialized_end=95
+# @@protoc_insertion_point(module_scope)

lib/protobuf/type_pb2.py

@@ -0,0 +1,42 @@
+# -*- coding: utf-8 -*-
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/type.proto
+"""Generated protocol buffer code."""
+from google.protobuf.internal import builder as _builder
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import descriptor_pool as _descriptor_pool
+from google.protobuf import symbol_database as _symbol_database
+# @@protoc_insertion_point(imports)
+
+_sym_db = _symbol_database.Default()
+
+
+from google.protobuf import any_pb2 as google_dot_protobuf_dot_any__pb2
+from google.protobuf import source_context_pb2 as google_dot_protobuf_dot_source__context__pb2
+
+
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x1agoogle/protobuf/type.proto\x12\x0fgoogle.protobuf\x1a\x19google/protobuf/any.proto\x1a$google/protobuf/source_context.proto\"\xd7\x01\n\x04Type\x12\x0c\n\x04name\x18\x01 \x01(\t\x12&\n\x06\x66ields\x18\x02 \x03(\x0b\x32\x16.google.protobuf.Field\x12\x0e\n\x06oneofs\x18\x03 \x03(\t\x12(\n\x07options\x18\x04 \x03(\x0b\x32\x17.google.protobuf.Option\x12\x36\n\x0esource_context\x18\x05 \x01(\x0b\x32\x1e.google.protobuf.SourceContext\x12\'\n\x06syntax\x18\x06 \x01(\x0e\x32\x17.google.protobuf.Syntax\"\xd5\x05\n\x05\x46ield\x12)\n\x04kind\x18\x01 \x01(\x0e\x32\x1b.google.protobuf.Field.Kind\x12\x37\n\x0b\x63\x61rdinality\x18\x02 \x01(\x0e\x32\".google.protobuf.Field.Cardinality\x12\x0e\n\x06number\x18\x03 \x01(\x05\x12\x0c\n\x04name\x18\x04 \x01(\t\x12\x10\n\x08type_url\x18\x06 \x01(\t\x12\x13\n\x0boneof_index\x18\x07 \x01(\x05\x12\x0e\n\x06packed\x18\x08 \x01(\x08\x12(\n\x07options\x18\t \x03(\x0b\x32\x17.google.protobuf.Option\x12\x11\n\tjson_name\x18\n \x01(\t\x12\x15\n\rdefault_value\x18\x0b \x01(\t\"\xc8\x02\n\x04Kind\x12\x10\n\x0cTYPE_UNKNOWN\x10\x00\x12\x0f\n\x0bTYPE_DOUBLE\x10\x01\x12\x0e\n\nTYPE_FLOAT\x10\x02\x12\x0e\n\nTYPE_INT64\x10\x03\x12\x0f\n\x0bTYPE_UINT64\x10\x04\x12\x0e\n\nTYPE_INT32\x10\x05\x12\x10\n\x0cTYPE_FIXED64\x10\x06\x12\x10\n\x0cTYPE_FIXED32\x10\x07\x12\r\n\tTYPE_BOOL\x10\x08\x12\x0f\n\x0bTYPE_STRING\x10\t\x12\x0e\n\nTYPE_GROUP\x10\n\x12\x10\n\x0cTYPE_MESSAGE\x10\x0b\x12\x0e\n\nTYPE_BYTES\x10\x0c\x12\x0f\n\x0bTYPE_UINT32\x10\r\x12\r\n\tTYPE_ENUM\x10\x0e\x12\x11\n\rTYPE_SFIXED32\x10\x0f\x12\x11\n\rTYPE_SFIXED64\x10\x10\x12\x0f\n\x0bTYPE_SINT32\x10\x11\x12\x0f\n\x0bTYPE_SINT64\x10\x12\"t\n\x0b\x43\x61rdinality\x12\x17\n\x13\x43\x41RDINALITY_UNKNOWN\x10\x00\x12\x18\n\x14\x43\x41RDINALITY_OPTIONAL\x10\x01\x12\x18\n\x14\x43\x41RDINALITY_REQUIRED\x10\x02\x12\x18\n\x14\x43\x41RDINALITY_REPEATED\x10\x03\"\xce\x01\n\x04\x45num\x12\x0c\n\x04name\x18\x01 \x01(\t\x12-\n\tenumvalue\x18\x02 \x03(\x0b\x32\x1a.google.protobuf.EnumValue\x12(\n\x07options\x18\x03 \x03(\x0b\x32\x17.google.protobuf.Option\x12\x36\n\x0esource_context\x18\x04 \x01(\x0b\x32\x1e.google.protobuf.SourceContext\x12\'\n\x06syntax\x18\x05 \x01(\x0e\x32\x17.google.protobuf.Syntax\"S\n\tEnumValue\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\x0e\n\x06number\x18\x02 \x01(\x05\x12(\n\x07options\x18\x03 \x03(\x0b\x32\x17.google.protobuf.Option\";\n\x06Option\x12\x0c\n\x04name\x18\x01 \x01(\t\x12#\n\x05value\x18\x02 \x01(\x0b\x32\x14.google.protobuf.Any*.\n\x06Syntax\x12\x11\n\rSYNTAX_PROTO2\x10\x00\x12\x11\n\rSYNTAX_PROTO3\x10\x01\x42{\n\x13\x63om.google.protobufB\tTypeProtoP\x01Z-google.golang.org/protobuf/types/known/typepb\xf8\x01\x01\xa2\x02\x03GPB\xaa\x02\x1eGoogle.Protobuf.WellKnownTypesb\x06proto3')
+
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'google.protobuf.type_pb2', globals())
+if _descriptor._USE_C_DESCRIPTORS == False:
+
+  DESCRIPTOR._options = None
+  DESCRIPTOR._serialized_options = b'\n\023com.google.protobufB\tTypeProtoP\001Z-google.golang.org/protobuf/types/known/typepb\370\001\001\242\002\003GPB\252\002\036Google.Protobuf.WellKnownTypes'
+  _SYNTAX._serialized_start=1413
+  _SYNTAX._serialized_end=1459
+  _TYPE._serialized_start=113
+  _TYPE._serialized_end=328
+  _FIELD._serialized_start=331
+  _FIELD._serialized_end=1056
+  _FIELD_KIND._serialized_start=610
+  _FIELD_KIND._serialized_end=938
+  _FIELD_CARDINALITY._serialized_start=940
+  _FIELD_CARDINALITY._serialized_end=1056
+  _ENUM._serialized_start=1059
+  _ENUM._serialized_end=1265
+  _ENUMVALUE._serialized_start=1267
+  _ENUMVALUE._serialized_end=1350
+  _OPTION._serialized_start=1352
+  _OPTION._serialized_end=1411
+# @@protoc_insertion_point(module_scope)

lib/protobuf/util/json_format_pb2.py

@@ -0,0 +1,72 @@
+# -*- coding: utf-8 -*-
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/util/json_format.proto
+"""Generated protocol buffer code."""
+from google.protobuf.internal import builder as _builder
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import descriptor_pool as _descriptor_pool
+from google.protobuf import symbol_database as _symbol_database
+# @@protoc_insertion_point(imports)
+
+_sym_db = _symbol_database.Default()
+
+
+
+
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n&google/protobuf/util/json_format.proto\x12\x11protobuf_unittest\"\x89\x01\n\x13TestFlagsAndStrings\x12\t\n\x01\x41\x18\x01 \x02(\x05\x12K\n\rrepeatedgroup\x18\x02 \x03(\n24.protobuf_unittest.TestFlagsAndStrings.RepeatedGroup\x1a\x1a\n\rRepeatedGroup\x12\t\n\x01\x66\x18\x03 \x02(\t\"!\n\x14TestBase64ByteArrays\x12\t\n\x01\x61\x18\x01 \x02(\x0c\"G\n\x12TestJavaScriptJSON\x12\t\n\x01\x61\x18\x01 \x01(\x05\x12\r\n\x05\x66inal\x18\x02 \x01(\x02\x12\n\n\x02in\x18\x03 \x01(\t\x12\x0b\n\x03Var\x18\x04 \x01(\t\"Q\n\x18TestJavaScriptOrderJSON1\x12\t\n\x01\x64\x18\x01 \x01(\x05\x12\t\n\x01\x63\x18\x02 \x01(\x05\x12\t\n\x01x\x18\x03 \x01(\x08\x12\t\n\x01\x62\x18\x04 \x01(\x05\x12\t\n\x01\x61\x18\x05 \x01(\x05\"\x89\x01\n\x18TestJavaScriptOrderJSON2\x12\t\n\x01\x64\x18\x01 \x01(\x05\x12\t\n\x01\x63\x18\x02 \x01(\x05\x12\t\n\x01x\x18\x03 \x01(\x08\x12\t\n\x01\x62\x18\x04 \x01(\x05\x12\t\n\x01\x61\x18\x05 \x01(\x05\x12\x36\n\x01z\x18\x06 \x03(\x0b\x32+.protobuf_unittest.TestJavaScriptOrderJSON1\"$\n\x0cTestLargeInt\x12\t\n\x01\x61\x18\x01 \x02(\x03\x12\t\n\x01\x62\x18\x02 \x02(\x04\"\xa0\x01\n\x0bTestNumbers\x12\x30\n\x01\x61\x18\x01 \x01(\x0e\x32%.protobuf_unittest.TestNumbers.MyType\x12\t\n\x01\x62\x18\x02 \x01(\x05\x12\t\n\x01\x63\x18\x03 \x01(\x02\x12\t\n\x01\x64\x18\x04 \x01(\x08\x12\t\n\x01\x65\x18\x05 \x01(\x01\x12\t\n\x01\x66\x18\x06 \x01(\r\"(\n\x06MyType\x12\x06\n\x02OK\x10\x00\x12\x0b\n\x07WARNING\x10\x01\x12\t\n\x05\x45RROR\x10\x02\"T\n\rTestCamelCase\x12\x14\n\x0cnormal_field\x18\x01 \x01(\t\x12\x15\n\rCAPITAL_FIELD\x18\x02 \x01(\x05\x12\x16\n\x0e\x43\x61melCaseField\x18\x03 \x01(\x05\"|\n\x0bTestBoolMap\x12=\n\x08\x62ool_map\x18\x01 \x03(\x0b\x32+.protobuf_unittest.TestBoolMap.BoolMapEntry\x1a.\n\x0c\x42oolMapEntry\x12\x0b\n\x03key\x18\x01 \x01(\x08\x12\r\n\x05value\x18\x02 \x01(\x05:\x02\x38\x01\"O\n\rTestRecursion\x12\r\n\x05value\x18\x01 \x01(\x05\x12/\n\x05\x63hild\x18\x02 \x01(\x0b\x32 .protobuf_unittest.TestRecursion\"\x86\x01\n\rTestStringMap\x12\x43\n\nstring_map\x18\x01 \x03(\x0b\x32/.protobuf_unittest.TestStringMap.StringMapEntry\x1a\x30\n\x0eStringMapEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\t:\x02\x38\x01\"\xc4\x01\n\x14TestStringSerializer\x12\x15\n\rscalar_string\x18\x01 \x01(\t\x12\x17\n\x0frepeated_string\x18\x02 \x03(\t\x12J\n\nstring_map\x18\x03 \x03(\x0b\x32\x36.protobuf_unittest.TestStringSerializer.StringMapEntry\x1a\x30\n\x0eStringMapEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\t:\x02\x38\x01\"$\n\x18TestMessageWithExtension*\x08\x08\x64\x10\x80\x80\x80\x80\x02\"z\n\rTestExtension\x12\r\n\x05value\x18\x01 \x01(\t2Z\n\x03\x65xt\x12+.protobuf_unittest.TestMessageWithExtension\x18\x64 \x01(\x0b\x32 .protobuf_unittest.TestExtension\"Q\n\x14TestDefaultEnumValue\x12\x39\n\nenum_value\x18\x01 \x01(\x0e\x32\x1c.protobuf_unittest.EnumValue:\x07\x44\x45\x46\x41ULT*2\n\tEnumValue\x12\x0c\n\x08PROTOCOL\x10\x00\x12\n\n\x06\x42UFFER\x10\x01\x12\x0b\n\x07\x44\x45\x46\x41ULT\x10\x02')
+
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'google.protobuf.util.json_format_pb2', globals())
+if _descriptor._USE_C_DESCRIPTORS == False:
+  TestMessageWithExtension.RegisterExtension(_TESTEXTENSION.extensions_by_name['ext'])
+
+  DESCRIPTOR._options = None
+  _TESTBOOLMAP_BOOLMAPENTRY._options = None
+  _TESTBOOLMAP_BOOLMAPENTRY._serialized_options = b'8\001'
+  _TESTSTRINGMAP_STRINGMAPENTRY._options = None
+  _TESTSTRINGMAP_STRINGMAPENTRY._serialized_options = b'8\001'
+  _TESTSTRINGSERIALIZER_STRINGMAPENTRY._options = None
+  _TESTSTRINGSERIALIZER_STRINGMAPENTRY._serialized_options = b'8\001'
+  _ENUMVALUE._serialized_start=1607
+  _ENUMVALUE._serialized_end=1657
+  _TESTFLAGSANDSTRINGS._serialized_start=62
+  _TESTFLAGSANDSTRINGS._serialized_end=199
+  _TESTFLAGSANDSTRINGS_REPEATEDGROUP._serialized_start=173
+  _TESTFLAGSANDSTRINGS_REPEATEDGROUP._serialized_end=199
+  _TESTBASE64BYTEARRAYS._serialized_start=201
+  _TESTBASE64BYTEARRAYS._serialized_end=234
+  _TESTJAVASCRIPTJSON._serialized_start=236
+  _TESTJAVASCRIPTJSON._serialized_end=307
+  _TESTJAVASCRIPTORDERJSON1._serialized_start=309
+  _TESTJAVASCRIPTORDERJSON1._serialized_end=390
+  _TESTJAVASCRIPTORDERJSON2._serialized_start=393
+  _TESTJAVASCRIPTORDERJSON2._serialized_end=530
+  _TESTLARGEINT._serialized_start=532
+  _TESTLARGEINT._serialized_end=568
+  _TESTNUMBERS._serialized_start=571
+  _TESTNUMBERS._serialized_end=731
+  _TESTNUMBERS_MYTYPE._serialized_start=691
+  _TESTNUMBERS_MYTYPE._serialized_end=731
+  _TESTCAMELCASE._serialized_start=733
+  _TESTCAMELCASE._serialized_end=817
+  _TESTBOOLMAP._serialized_start=819
+  _TESTBOOLMAP._serialized_end=943
+  _TESTBOOLMAP_BOOLMAPENTRY._serialized_start=897
+  _TESTBOOLMAP_BOOLMAPENTRY._serialized_end=943
+  _TESTRECURSION._serialized_start=945
+  _TESTRECURSION._serialized_end=1024
+  _TESTSTRINGMAP._serialized_start=1027
+  _TESTSTRINGMAP._serialized_end=1161
+  _TESTSTRINGMAP_STRINGMAPENTRY._serialized_start=1113
+  _TESTSTRINGMAP_STRINGMAPENTRY._serialized_end=1161
+  _TESTSTRINGSERIALIZER._serialized_start=1164
+  _TESTSTRINGSERIALIZER._serialized_end=1360
+  _TESTSTRINGSERIALIZER_STRINGMAPENTRY._serialized_start=1113
+  _TESTSTRINGSERIALIZER_STRINGMAPENTRY._serialized_end=1161
+  _TESTMESSAGEWITHEXTENSION._serialized_start=1362
+  _TESTMESSAGEWITHEXTENSION._serialized_end=1398
+  _TESTEXTENSION._serialized_start=1400
+  _TESTEXTENSION._serialized_end=1522
+  _TESTDEFAULTENUMVALUE._serialized_start=1524
+  _TESTDEFAULTENUMVALUE._serialized_end=1605
+# @@protoc_insertion_point(module_scope)

lib/protobuf/wrappers_pb2.py

@@ -0,0 +1,42 @@
+# -*- coding: utf-8 -*-
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/wrappers.proto
+"""Generated protocol buffer code."""
+from google.protobuf.internal import builder as _builder
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import descriptor_pool as _descriptor_pool
+from google.protobuf import symbol_database as _symbol_database
+# @@protoc_insertion_point(imports)
+
+_sym_db = _symbol_database.Default()
+
+
+
+
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x1egoogle/protobuf/wrappers.proto\x12\x0fgoogle.protobuf\"\x1c\n\x0b\x44oubleValue\x12\r\n\x05value\x18\x01 \x01(\x01\"\x1b\n\nFloatValue\x12\r\n\x05value\x18\x01 \x01(\x02\"\x1b\n\nInt64Value\x12\r\n\x05value\x18\x01 \x01(\x03\"\x1c\n\x0bUInt64Value\x12\r\n\x05value\x18\x01 \x01(\x04\"\x1b\n\nInt32Value\x12\r\n\x05value\x18\x01 \x01(\x05\"\x1c\n\x0bUInt32Value\x12\r\n\x05value\x18\x01 \x01(\r\"\x1a\n\tBoolValue\x12\r\n\x05value\x18\x01 \x01(\x08\"\x1c\n\x0bStringValue\x12\r\n\x05value\x18\x01 \x01(\t\"\x1b\n\nBytesValue\x12\r\n\x05value\x18\x01 \x01(\x0c\x42\x83\x01\n\x13\x63om.google.protobufB\rWrappersProtoP\x01Z1google.golang.org/protobuf/types/known/wrapperspb\xf8\x01\x01\xa2\x02\x03GPB\xaa\x02\x1eGoogle.Protobuf.WellKnownTypesb\x06proto3')
+
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'google.protobuf.wrappers_pb2', globals())
+if _descriptor._USE_C_DESCRIPTORS == False:
+
+  DESCRIPTOR._options = None
+  DESCRIPTOR._serialized_options = b'\n\023com.google.protobufB\rWrappersProtoP\001Z1google.golang.org/protobuf/types/known/wrapperspb\370\001\001\242\002\003GPB\252\002\036Google.Protobuf.WellKnownTypes'
+  _DOUBLEVALUE._serialized_start=51
+  _DOUBLEVALUE._serialized_end=79
+  _FLOATVALUE._serialized_start=81
+  _FLOATVALUE._serialized_end=108
+  _INT64VALUE._serialized_start=110
+  _INT64VALUE._serialized_end=137
+  _UINT64VALUE._serialized_start=139
+  _UINT64VALUE._serialized_end=167
+  _INT32VALUE._serialized_start=169
+  _INT32VALUE._serialized_end=196
+  _UINT32VALUE._serialized_start=198
+  _UINT32VALUE._serialized_end=226
+  _BOOLVALUE._serialized_start=228
+  _BOOLVALUE._serialized_end=254
+  _STRINGVALUE._serialized_start=256
+  _STRINGVALUE._serialized_end=284
+  _BYTESVALUE._serialized_start=286
+  _BYTESVALUE._serialized_end=313
+# @@protoc_insertion_point(module_scope)

resources/language/resource.language.de_de/strings.po

@@ -0,0 +1,179 @@
+# Kodi Media Center language file
+# Addon Name: Spotify
+# Addon id: plugin.audio.spotify
+# Addon Provider: marcelveldt
+msgid ""
+msgstr ""
+"Project-Id-Version: Kodi-Addons\n"
+"Report-Msgid-Bugs-To: alanwww1@xbmc.org\n"
+"POT-Creation-Date: 2015-11-04 18:30+0100\n"
+"PO-Revision-Date: 2015-11-04 18:30+0100\n"
+"Last-Translator: tobhor\n"
+"Language-Team: German\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Language: de\n"
+"Plural-Forms: nplurals=2; plural=(n != 1)\n"
+
+msgctxt "#11001"
+msgid "Username"
+msgstr "Nutzername"
+
+msgctxt "#11002"
+msgid "Password"
+msgstr "Passwort"
+
+msgctxt "#11005"
+msgid "New releases"
+msgstr "Neuerscheinungen"
+
+msgctxt "#11007"
+msgid "Save to My Music"
+msgstr "Zu meiner Musik hinzufügen"
+
+msgctxt "#11008"
+msgid "Remove from My Music"
+msgstr "Aus meiner Musik entfernen"
+
+msgctxt "#11009"
+msgid "Follow"
+msgstr "Folgen"
+
+msgctxt "#11010"
+msgid "Unfollow"
+msgstr "Nicht mehr folgen"
+
+msgctxt "#11011"
+msgid "Artist top tracks"
+msgstr "Beliebteste Lieder des Künstlers"
+
+msgctxt "#11012"
+msgid "Related artists"
+msgstr "Ähnliche Künstler"
+
+msgctxt "#11013"
+msgid "My Music"
+msgstr "Meine Musik"
+
+msgctxt "#11014"
+msgid "Explore"
+msgstr "Entdecken"
+
+msgctxt "#11015"
+msgid "Featured playlists"
+msgstr "Empfohlene Wiedergabelisten"
+
+msgctxt "#11016"
+msgid "New releases"
+msgstr "Neuerscheinungen"
+
+msgctxt "#11017"
+msgid "Remove from playlist"
+msgstr "Aus Playlist entfernen"
+
+msgctxt "#11018"
+msgid "All albums for artist"
+msgstr "Alle Alben des Künstlers"
+
+msgctxt "#11020"
+msgid "Default view for categories"
+msgstr ""
+
+msgctxt "#11023"
+msgid "Most played artists"
+msgstr "Meistgespielte Künstler"
+
+msgctxt "#11024"
+msgid "Most played tracks"
+msgstr "Meistgespielte Lieder"
+
+msgctxt "#11025"
+msgid "Follow artist"
+msgstr "Künstler folgen"
+
+msgctxt "#11026"
+msgid "Unfollow artist"
+msgstr "Künstler nicht mehr folgen"
+
+msgctxt "#11027"
+msgid "Refresh listing"
+msgstr "Eintrag aktualisieren"
+
+msgctxt "#11028"
+msgid "Login details"
+msgstr "Anmeldedetails"
+
+msgctxt "#11030"
+msgid "Append artist name to song title"
+msgstr "Künstlername an Songtitel anhängen"
+
+msgctxt "#11031"
+msgid "Default view for playlists"
+msgstr "Standardansicht für Wiedergabeliste"
+
+msgctxt "#11032"
+msgid "Default view for artist list"
+msgstr "Standardansicht für Künstlerliste"
+
+msgctxt "#11033"
+msgid "Default view for album list"
+msgstr "Standardansicht für Albenliste"
+
+msgctxt "#11034"
+msgid "Default view for song list"
+msgstr "Standardansicht für Songliste"
+
+msgctxt "#11047"
+msgid "Current user"
+msgstr "Aktueller Benutzer"
+
+msgctxt "#11050"
+msgid ""
+"Spotify login failed. Either no credentials have been set or the Spotify username or password is incorrect.\n"
+"Please check your username and password in the addon settings."
+msgstr "Keine Anmeldedaten vorhanden oder Anmeldung fehlgeschlagen. \n Bitte gebe deine Anmeldedaten im folgenden Einstellungsdialog ein."
+
+msgctxt "#11054"
+msgid "Audio"
+msgstr "Audio"
+
+msgctxt "#11055"
+msgid "Views"
+msgstr "Ansichten"
+
+msgctxt "#11069"
+msgid "My recently played playlist"
+msgstr "My recently played playlist"
+
+msgctxt "#11070"
+msgid "Gap between tracks when playing a playlist (secs)"
+msgstr "Gap between tracks when playing a playlist (secs)"
+
+msgctxt "#11071"
+msgid ""
+"To give better audio streaming from Spotify, a video http rule was just added to 'userdata/playercorefactory.xml'.\n"
+"Please restart Kodi for this to take affect."
+msgstr ""
+"To give better audio streaming from Spotify, a video http rule was just added to 'userdata/playercorefactory.xml'.\n"
+"Please restart Kodi for this to take affect."
+
+msgctxt "#11072"
+msgid "Clear the plugin cache"
+msgstr "Clear the plugin cache"
+
+msgctxt "#11073"
+msgid "Followed artists"
+msgstr "Followed artists"
+
+msgctxt "#11074"
+msgid ""
+"Successfully cleared the plugin cache database.\n"
+"Please restart Kodi for this to take affect."
+msgstr ""
+"Successfully cleared the plugin cache database.\n"
+"Please restart Kodi for this to take affect."
+
+msgctxt "#11075"
+msgid "Use Spotify normalization when playing tracks"
+msgstr ""

resources/language/resource.language.en_gb/strings.po

@@ -0,0 +1,175 @@
+# Kodi Media Center language file
+# Addon Name: Spotify
+# Addon id: plugin.audio.spotify
+# Addon Provider: marcelveldt
+msgid ""
+msgstr ""
+"Project-Id-Version: Kodi-Addons\n"
+"Report-Msgid-Bugs-To: alanwww1@xbmc.org\n"
+"POT-Creation-Date: 2015-11-04 18:30+0100\n"
+"PO-Revision-Date: 2015-11-04 18:30+0100\n"
+"Last-Translator: logi85\n"
+"Language-Team: English\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Language: en\n"
+"Plural-Forms: nplurals=2; plural=(n != 1)\n"
+
+msgctxt "#11001"
+msgid "Username"
+msgstr ""
+
+msgctxt "#11002"
+msgid "Password"
+msgstr ""
+
+msgctxt "#11005"
+msgid "New releases"
+msgstr ""
+
+msgctxt "#11007"
+msgid "Save to My Music"
+msgstr ""
+
+msgctxt "#11008"
+msgid "Remove from My Music"
+msgstr ""
+
+msgctxt "#11009"
+msgid "Follow"
+msgstr ""
+
+msgctxt "#11010"
+msgid "Unfollow"
+msgstr ""
+
+msgctxt "#11011"
+msgid "Artist top tracks"
+msgstr ""
+
+msgctxt "#11012"
+msgid "Related artists"
+msgstr ""
+
+msgctxt "#11013"
+msgid "My Music"
+msgstr ""
+
+msgctxt "#11014"
+msgid "Explore"
+msgstr ""
+
+msgctxt "#11015"
+msgid "Featured playlists"
+msgstr ""
+
+msgctxt "#11016"
+msgid "New releases"
+msgstr ""
+
+msgctxt "#11017"
+msgid "Remove from playlist"
+msgstr ""
+
+msgctxt "#11018"
+msgid "All albums for artist"
+msgstr ""
+
+msgctxt "#11020"
+msgid "Default view for categories"
+msgstr ""
+
+msgctxt "#11023"
+msgid "Most played artists"
+msgstr ""
+
+msgctxt "#11024"
+msgid "Most played tracks"
+msgstr ""
+
+msgctxt "#11025"
+msgid "Follow artist"
+msgstr ""
+
+msgctxt "#11026"
+msgid "Unfollow artist"
+msgstr ""
+
+msgctxt "#11027"
+msgid "Refresh listing"
+msgstr ""
+
+msgctxt "#11028"
+msgid "Login details"
+msgstr ""
+
+msgctxt "#11030"
+msgid "Append artist name to song title"
+msgstr ""
+
+msgctxt "#11031"
+msgid "Default view for playlists"
+msgstr ""
+
+msgctxt "#11032"
+msgid "Default view for artist list"
+msgstr ""
+
+msgctxt "#11033"
+msgid "Default view for album list"
+msgstr ""
+
+msgctxt "#11034"
+msgid "Default view for song list"
+msgstr ""
+
+msgctxt "#11047"
+msgid "Current user"
+msgstr ""
+
+msgctxt "#11050"
+msgid ""
+"Spotify login failed. Either no credentials have been set or the Spotify username or password is incorrect.\n"
+"Please check your username and password in the addon settings."
+msgstr ""
+
+msgctxt "#11054"
+msgid "Audio"
+msgstr ""
+
+msgctxt "#11055"
+msgid "Views"
+msgstr ""
+
+msgctxt "#11069"
+msgid "My recently played playlist"
+msgstr ""
+
+msgctxt "#11070"
+msgid "Gap between tracks when playing a playlist (secs)"
+msgstr ""
+
+msgctxt "#11071"
+msgid ""
+"To give better audio streaming from Spotify, a video http rule was just added to 'userdata/playercorefactory.xml'.\n"
+"Please restart Kodi for this to take affect."
+msgstr ""
+
+msgctxt "#11072"
+msgid "Clear the plugin cache"
+msgstr ""
+
+msgctxt "#11073"
+msgid "Followed artists"
+msgstr ""
+
+msgctxt "#11074"
+msgid ""
+"Successfully cleared the plugin cache database.\n"
+"Please restart Kodi for this to take affect."
+msgstr ""
+
+msgctxt "#11075"
+msgid "Use Spotify normalization when playing tracks"
+msgstr ""

resources/language/resource.language.es_ar/strings.po

@@ -0,0 +1,175 @@
+# Kodi Media Center language file
+# Addon Name: Spotify
+# Addon id: plugin.audio.spotify
+# Addon Provider: marcelveldt
+msgid ""
+msgstr ""
+"Project-Id-Version: Kodi-Addons\n"
+"Report-Msgid-Bugs-To: alanwww1@xbmc.org\n"
+"POT-Creation-Date: 2015-11-04 18:30+0100\n"
+"PO-Revision-Date: 2015-11-04 18:30+0100\n"
+"Last-Translator: trihy\n"
+"Language-Team: English\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Language: es_ar\n"
+"Plural-Forms: nplurals=2; plural=(n != 1)\n"
+
+msgctxt "#11001"
+msgid "Username"
+msgstr "Nombre de Usuario"
+
+msgctxt "#11002"
+msgid "Password"
+msgstr "Contraseña"
+
+msgctxt "#11005"
+msgid "New releases"
+msgstr "Nuevos Lanzamientos"
+
+msgctxt "#11007"
+msgid "Save to My Music"
+msgstr "Guardar en Mi Música"
+
+msgctxt "#11008"
+msgid "Remove from My Music"
+msgstr "Remover de Mi Música"
+
+msgctxt "#11009"
+msgid "Follow"
+msgstr "Seguir"
+
+msgctxt "#11010"
+msgid "Unfollow"
+msgstr "Dejar de Seguir"
+
+msgctxt "#11011"
+msgid "Artist top tracks"
+msgstr "Canciones Top del Artista"
+
+msgctxt "#11012"
+msgid "Related artists"
+msgstr "Artistas Relacionados"
+
+msgctxt "#11013"
+msgid "My Music"
+msgstr "Mi Música"
+
+msgctxt "#11014"
+msgid "Explore"
+msgstr "Explorar"
+
+msgctxt "#11015"
+msgid "Featured playlists"
+msgstr "Playlists Destacadas"
+
+msgctxt "#11016"
+msgid "New releases"
+msgstr "Nuevos Lanzamientos"
+
+msgctxt "#11017"
+msgid "Remove from playlist"
+msgstr "Remover del Playlist"
+
+msgctxt "#11018"
+msgid "All albums for artist"
+msgstr "Todos los Albumes del Artista"
+
+msgctxt "#11020"
+msgid "Default view for categories"
+msgstr "Vista por Defecto para Categorías"
+
+msgctxt "#11023"
+msgid "Most played artists"
+msgstr "Artistas más Reproducidos "
+
+msgctxt "#11024"
+msgid "Most played tracks"
+msgstr "Canciones más Reproducidas"
+
+msgctxt "#11025"
+msgid "Follow artist"
+msgstr "Seguir Artista"
+
+msgctxt "#11026"
+msgid "Unfollow artist"
+msgstr "Dejar de Seguir Artista"
+
+msgctxt "#11027"
+msgid "Refresh listing"
+msgstr "Refrescar Listado"
+
+msgctxt "#11028"
+msgid "Login details"
+msgstr "Detalles de Login"
+
+msgctxt "#11030"
+msgid "Append artist name to song title"
+msgstr "Adjuntar Nombre del Artista a Título de Canción"
+
+msgctxt "#11031"
+msgid "Default view for playlists"
+msgstr "Vista por Defecto para Playlists"
+
+msgctxt "#11032"
+msgid "Default view for artist list"
+msgstr "Vista por Defecto para Lista de Artista"
+
+msgctxt "#11033"
+msgid "Default view for album list"
+msgstr "Vista por Defecto para Lista de Album"
+
+msgctxt "#11034"
+msgid "Default view for song list"
+msgstr "Vista por Defecto para Lista de Canción"
+
+msgctxt "#11047"
+msgid "Current user"
+msgstr "Usuario Actual"
+
+msgctxt "#11050"
+msgid ""
+"Spotify login failed. Either no credentials have been set or the Spotify username or password is incorrect.\n"
+"Please check your username and password in the addon settings."
+msgstr ""
+
+msgctxt "#11054"
+msgid "Audio"
+msgstr "Audio"
+
+msgctxt "#11055"
+msgid "Views"
+msgstr "Vistas"
+
+msgctxt "#11069"
+msgid "My recently played playlist"
+msgstr "Mi Playlist reproducida Recientemente"
+
+msgctxt "#11070"
+msgid "Gap between tracks when playing a playlist (secs)"
+msgstr "Espacio entre canciones cuando se reproduce una playlist (Segundos)"
+
+msgctxt "#11071"
+msgid ""
+"To give better audio streaming from Spotify, a video http rule was just added to 'userdata/playercorefactory.xml'.\n"
+"Please restart Kodi for this to take affect."
+msgstr ""
+
+msgctxt "#11072"
+msgid "Clear the plugin cache"
+msgstr "Limpiar cache del plugin"
+
+msgctxt "#11073"
+msgid "Followed artists"
+msgstr "Artistas Seguidos"
+
+msgctxt "#11074"
+msgid ""
+"Successfully cleared the plugin cache database.\n"
+"Please restart Kodi for this to take affect."
+msgstr "Cache de base de datos del plugin exitosamente limpiada"
+
+msgctxt "#11075"
+msgid "Use Spotify normalization when playing tracks"
+msgstr "Usar Normalizacion de Spotify cuando reproduzca canciones"

resources/language/resource.language.es_es/strings.po

@@ -0,0 +1,175 @@
+# Kodi Media Center language file
+# Addon Name: Spotify
+# Addon id: plugin.audio.spotify
+# Addon Provider: marcelveldt
+msgid ""
+msgstr ""
+"Project-Id-Version: Kodi-Addons\n"
+"Report-Msgid-Bugs-To: alanwww1@xbmc.org\n"
+"POT-Creation-Date: 2015-11-04 18:30+0100\n"
+"PO-Revision-Date: 2015-11-04 18:30+0100\n"
+"Last-Translator: trihy\n"
+"Language-Team: English\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Language: es_es\n"
+"Plural-Forms: nplurals=2; plural=(n != 1)\n"
+
+msgctxt "#11001"
+msgid "Username"
+msgstr "Nombre de Usuario"
+
+msgctxt "#11002"
+msgid "Password"
+msgstr "Contraseña"
+
+msgctxt "#11005"
+msgid "New releases"
+msgstr "Nuevos Lanzamientos"
+
+msgctxt "#11007"
+msgid "Save to My Music"
+msgstr "Guardar en Mi Música"
+
+msgctxt "#11008"
+msgid "Remove from My Music"
+msgstr "Remover de Mi Música"
+
+msgctxt "#11009"
+msgid "Follow"
+msgstr "Seguir"
+
+msgctxt "#11010"
+msgid "Unfollow"
+msgstr "Dejar de Seguir"
+
+msgctxt "#11011"
+msgid "Artist top tracks"
+msgstr "Canciones Top del Artista"
+
+msgctxt "#11012"
+msgid "Related artists"
+msgstr "Artistas Relacionados"
+
+msgctxt "#11013"
+msgid "My Music"
+msgstr "Mi Música"
+
+msgctxt "#11014"
+msgid "Explore"
+msgstr "Explorar"
+
+msgctxt "#11015"
+msgid "Featured playlists"
+msgstr "Playlists Destacadas"
+
+msgctxt "#11016"
+msgid "New releases"
+msgstr "Nuevos Lanzamientos"
+
+msgctxt "#11017"
+msgid "Remove from playlist"
+msgstr "Remover del Playlist"
+
+msgctxt "#11018"
+msgid "All albums for artist"
+msgstr "Todos los Albumes del Artista"
+
+msgctxt "#11020"
+msgid "Default view for categories"
+msgstr "Vista por Defecto para Categorías"
+
+msgctxt "#11023"
+msgid "Most played artists"
+msgstr "Artistas más Reproducidos "
+
+msgctxt "#11024"
+msgid "Most played tracks"
+msgstr "Canciones más Reproducidas"
+
+msgctxt "#11025"
+msgid "Follow artist"
+msgstr "Seguir Artista"
+
+msgctxt "#11026"
+msgid "Unfollow artist"
+msgstr "Dejar de Seguir Artista"
+
+msgctxt "#11027"
+msgid "Refresh listing"
+msgstr "Refrescar Listado"
+
+msgctxt "#11028"
+msgid "Login details"
+msgstr "Detalles de Login"
+
+msgctxt "#11030"
+msgid "Append artist name to song title"
+msgstr "Adjuntar Nombre del Artista a Título de Canción"
+
+msgctxt "#11031"
+msgid "Default view for playlists"
+msgstr "Vista por Defecto para Playlists"
+
+msgctxt "#11032"
+msgid "Default view for artist list"
+msgstr "Vista por Defecto para Lista de Artista"
+
+msgctxt "#11033"
+msgid "Default view for album list"
+msgstr "Vista por Defecto para Lista de Album"
+
+msgctxt "#11034"
+msgid "Default view for song list"
+msgstr "Vista por Defecto para Lista de Canción"
+
+msgctxt "#11047"
+msgid "Current user"
+msgstr "Usuario Actual"
+
+msgctxt "#11050"
+msgid ""
+"Spotify login failed. Either no credentials have been set or the Spotify username or password is incorrect.\n"
+"Please check your username and password in the addon settings."
+msgstr ""
+
+msgctxt "#11054"
+msgid "Audio"
+msgstr "Audio"
+
+msgctxt "#11055"
+msgid "Views"
+msgstr "Vistas"
+
+msgctxt "#11069"
+msgid "My recently played playlist"
+msgstr "Mi Playlist reproducida Recientemente"
+
+msgctxt "#11070"
+msgid "Gap between tracks when playing a playlist (secs)"
+msgstr "Espacio entre canciones cuando se reproduce una playlist (Segundos)"
+
+msgctxt "#11071"
+msgid ""
+"To give better audio streaming from Spotify, a video http rule was just added to 'userdata/playercorefactory.xml'.\n"
+"Please restart Kodi for this to take affect."
+msgstr ""
+
+msgctxt "#11072"
+msgid "Clear the plugin cache"
+msgstr "Limpiar cache del plugin"
+
+msgctxt "#11073"
+msgid "Followed artists"
+msgstr "Artistas Seguidos"
+
+msgctxt "#11074"
+msgid ""
+"Successfully cleared the plugin cache database.\n"
+"Please restart Kodi for this to take affect."
+msgstr "Cache de base de datos del plugin exitosamente limpiada"
+
+msgctxt "#11075"
+msgid "Use Spotify normalization when playing tracks"
+msgstr "Usar Normalizacion de Spotify cuando reproduzca canciones"

resources/language/resource.language.es_mx/strings.po

@@ -0,0 +1,175 @@
+# Kodi Media Center language file
+# Addon Name: Spotify
+# Addon id: plugin.audio.spotify
+# Addon Provider: marcelveldt
+msgid ""
+msgstr ""
+"Project-Id-Version: Kodi-Addons\n"
+"Report-Msgid-Bugs-To: alanwww1@xbmc.org\n"
+"POT-Creation-Date: 2015-11-04 18:30+0100\n"
+"PO-Revision-Date: 2015-11-04 18:30+0100\n"
+"Last-Translator: trihy\n"
+"Language-Team: English\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Language: es_mx\n"
+"Plural-Forms: nplurals=2; plural=(n != 1)\n"
+
+msgctxt "#11001"
+msgid "Username"
+msgstr "Nombre de Usuario"
+
+msgctxt "#11002"
+msgid "Password"
+msgstr "Contraseña"
+
+msgctxt "#11005"
+msgid "New releases"
+msgstr "Nuevos Lanzamientos"
+
+msgctxt "#11007"
+msgid "Save to My Music"
+msgstr "Guardar en Mi Música"
+
+msgctxt "#11008"
+msgid "Remove from My Music"
+msgstr "Remover de Mi Música"
+
+msgctxt "#11009"
+msgid "Follow"
+msgstr "Seguir"
+
+msgctxt "#11010"
+msgid "Unfollow"
+msgstr "Dejar de Seguir"
+
+msgctxt "#11011"
+msgid "Artist top tracks"
+msgstr "Canciones Top del Artista"
+
+msgctxt "#11012"
+msgid "Related artists"
+msgstr "Artistas Relacionados"
+
+msgctxt "#11013"
+msgid "My Music"
+msgstr "Mi Música"
+
+msgctxt "#11014"
+msgid "Explore"
+msgstr "Explorar"
+
+msgctxt "#11015"
+msgid "Featured playlists"
+msgstr "Playlists Destacadas"
+
+msgctxt "#11016"
+msgid "New releases"
+msgstr "Nuevos Lanzamientos"
+
+msgctxt "#11017"
+msgid "Remove from playlist"
+msgstr "Remover del Playlist"
+
+msgctxt "#11018"
+msgid "All albums for artist"
+msgstr "Todos los Albumes del Artista"
+
+msgctxt "#11020"
+msgid "Default view for categories"
+msgstr "Vista por Defecto para Categorías"
+
+msgctxt "#11023"
+msgid "Most played artists"
+msgstr "Artistas más Reproducidos "
+
+msgctxt "#11024"
+msgid "Most played tracks"
+msgstr "Canciones más Reproducidas"
+
+msgctxt "#11025"
+msgid "Follow artist"
+msgstr "Seguir Artista"
+
+msgctxt "#11026"
+msgid "Unfollow artist"
+msgstr "Dejar de Seguir Artista"
+
+msgctxt "#11027"
+msgid "Refresh listing"
+msgstr "Refrescar Listado"
+
+msgctxt "#11028"
+msgid "Login details"
+msgstr "Detalles de Login"
+
+msgctxt "#11030"
+msgid "Append artist name to song title"
+msgstr "Adjuntar Nombre del Artista a Título de Canción"
+
+msgctxt "#11031"
+msgid "Default view for playlists"
+msgstr "Vista por Defecto para Playlists"
+
+msgctxt "#11032"
+msgid "Default view for artist list"
+msgstr "Vista por Defecto para Lista de Artista"
+
+msgctxt "#11033"
+msgid "Default view for album list"
+msgstr "Vista por Defecto para Lista de Album"
+
+msgctxt "#11034"
+msgid "Default view for song list"
+msgstr "Vista por Defecto para Lista de Canción"
+
+msgctxt "#11047"
+msgid "Current user"
+msgstr "Usuario Actual"
+
+msgctxt "#11050"
+msgid ""
+"Spotify login failed. Either no credentials have been set or the Spotify username or password is incorrect.\n"
+"Please check your username and password in the addon settings."
+msgstr ""
+
+msgctxt "#11054"
+msgid "Audio"
+msgstr "Audio"
+
+msgctxt "#11055"
+msgid "Views"
+msgstr "Vistas"
+
+msgctxt "#11069"
+msgid "My recently played playlist"
+msgstr "Mi Playlist reproducida Recientemente"
+
+msgctxt "#11070"
+msgid "Gap between tracks when playing a playlist (secs)"
+msgstr "Espacio entre canciones cuando se reproduce una playlist (Segundos)"
+
+msgctxt "#11071"
+msgid ""
+"To give better audio streaming from Spotify, a video http rule was just added to 'userdata/playercorefactory.xml'.\n"
+"Please restart Kodi for this to take affect."
+msgstr ""
+
+msgctxt "#11072"
+msgid "Clear the plugin cache"
+msgstr "Limpiar cache del plugin"
+
+msgctxt "#11073"
+msgid "Followed artists"
+msgstr "Artistas Seguidos"
+
+msgctxt "#11074"
+msgid ""
+"Successfully cleared the plugin cache database.\n"
+"Please restart Kodi for this to take affect."
+msgstr "Cache de base de datos del plugin exitosamente limpiada"
+
+msgctxt "#11075"
+msgid "Use Spotify normalization when playing tracks"
+msgstr "Usar Normalizacion de Spotify cuando reproduzca canciones"

resources/language/resource.language.fr_fr/strings.po

@@ -0,0 +1,179 @@
+# Kodi Media Center language file
+# Addon Name: Spotify
+# Addon id: plugin.audio.spotify
+# Addon Provider: marcelveldt
+msgid ""
+msgstr ""
+"Project-Id-Version: Kodi-Addons\n"
+"Report-Msgid-Bugs-To: alanwww1@xbmc.org\n"
+"POT-Creation-Date: 2015-11-04 18:30+0100\n"
+"PO-Revision-Date: 2015-11-04 18:30+0100\n"
+"Last-Translator: xsellier\n"
+"Language-Team: French\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Language: en\n"
+"Plural-Forms: nplurals=2; plural=(n != 1)\n"
+
+msgctxt "#11001"
+msgid "Username"
+msgstr "Nom d'utilisateur"
+
+msgctxt "#11002"
+msgid "Password"
+msgstr "Mot de passe"
+
+msgctxt "#11005"
+msgid "New releases"
+msgstr "Nouveautés"
+
+msgctxt "#11007"
+msgid "Save to My Music"
+msgstr "Ajouter a Ma Musique"
+
+msgctxt "#11008"
+msgid "Remove from My Music"
+msgstr "Enlever de Ma Musique"
+
+msgctxt "#11009"
+msgid "Follow"
+msgstr "Suivre"
+
+msgctxt "#11010"
+msgid "Unfollow"
+msgstr "Arrêter de suivre"
+
+msgctxt "#11011"
+msgid "Artist top tracks"
+msgstr "Les meilleures chansons de l'artiste"
+
+msgctxt "#11012"
+msgid "Related artists"
+msgstr "Artistes similaires"
+
+msgctxt "#11013"
+msgid "My Music"
+msgstr "Ma Musique"
+
+msgctxt "#11014"
+msgid "Explore"
+msgstr "Explorer"
+
+msgctxt "#11015"
+msgid "Featured playlists"
+msgstr "Listes de lectures mises en avant"
+
+msgctxt "#11016"
+msgid "New releases"
+msgstr "Nouveautés"
+
+msgctxt "#11017"
+msgid "Remove from playlist"
+msgstr "Enlever de la liste de lecture"
+
+msgctxt "#11018"
+msgid "All albums for artist"
+msgstr "Tous les albums de cet artiste"
+
+msgctxt "#11020"
+msgid "Default view for categories"
+msgstr ""
+
+msgctxt "#11023"
+msgid "Most played artists"
+msgstr "Les artistes les plus écoutés"
+
+msgctxt "#11024"
+msgid "Most played tracks"
+msgstr "Les musiques les plus jouées"
+
+msgctxt "#11025"
+msgid "Follow artist"
+msgstr "Suivre l'artiste"
+
+msgctxt "#11026"
+msgid "Unfollow artist"
+msgstr "Arrêter de suivre l'artiste"
+
+msgctxt "#11027"
+msgid "Refresh listing"
+msgstr "Rafraîchir la liste"
+
+msgctxt "#11028"
+msgid "Login details"
+msgstr "Détails de l'authentification"
+
+msgctxt "#11030"
+msgid "Append artist name to song title"
+msgstr "Mettre l nom de l'artiste à la suite du titre de la chanson"
+
+msgctxt "#11031"
+msgid "Default view for playlists"
+msgstr "Liste de lecture comme vue par défaut"
+
+msgctxt "#11032"
+msgid "Default view for artist list"
+msgstr "Liste d'artistes comme vue par défaut"
+
+msgctxt "#11033"
+msgid "Default view for album list"
+msgstr "Liste d'albums comme vue par défaut"
+
+msgctxt "#11034"
+msgid "Default view for song list"
+msgstr "Liste de chansons comme vue par défaut"
+
+msgctxt "#11047"
+msgid "Current user"
+msgstr ""
+
+msgctxt "#11050"
+msgid ""
+"Spotify login failed. Either no credentials have been set or the Spotify username or password is incorrect.\n"
+"Please check your username and password in the addon settings."
+msgstr ""
+
+msgctxt "#11054"
+msgid "Audio"
+msgstr ""
+
+msgctxt "#11055"
+msgid "Views"
+msgstr ""
+
+msgctxt "#11069"
+msgid "My recently played playlist"
+msgstr "My recently played playlist"
+
+msgctxt "#11070"
+msgid "Gap between tracks when playing a playlist (secs)"
+msgstr "Gap between tracks when playing a playlist (secs)"
+
+msgctxt "#11071"
+msgid ""
+"To give better audio streaming from Spotify, a video http rule was just added to 'userdata/playercorefactory.xml'.\n"
+"Please restart Kodi for this to take affect."
+msgstr ""
+"To give better audio streaming from Spotify, a video http rule was just added to 'userdata/playercorefactory.xml'.\n"
+"Please restart Kodi for this to take affect."
+
+msgctxt "#11072"
+msgid "Clear the plugin cache"
+msgstr "Clear the plugin cache"
+
+msgctxt "#11073"
+msgid "Followed artists"
+msgstr "Followed artists"
+
+msgctxt "#11074"
+msgid ""
+"Successfully cleared the plugin cache database.\n"
+"Please restart Kodi for this to take affect."
+msgstr ""
+"Successfully cleared the plugin cache database.\n"
+"Please restart Kodi for this to take affect."
+
+msgctxt "#11075"
+msgid "Use Spotify normalization when playing tracks"
+msgstr ""

resources/language/resource.language.he_he/strings.po

@@ -0,0 +1,182 @@
+# Kodi Media Center language file
+# Addon Name: Spotify
+# Addon id: plugin.audio.spotify
+# Addon Provider: marcelveldt
+msgid ""
+msgstr ""
+"Project-Id-Version: Kodi-Addons\n"
+"Report-Msgid-Bugs-To: alanwww1@xbmc.org\n"
+"POT-Creation-Date: 2015-11-04 18:30+0100\n"
+"PO-Revision-Date: 2017-09-28 14:10+0300\n"
+"Last-Translator: A. Dambledore\n"
+"Language-Team: Eng2Heb\n"
+"Language: he_IL\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=2; plural=(n != 1);\n"
+"X-Generator: Poedit 2.0.4\n"
+
+msgctxt "#11001"
+msgid "Username"
+msgstr "שם משתמש"
+
+msgctxt "#11002"
+msgid "Password"
+msgstr "ססמה"
+
+msgctxt "#11005"
+msgid "New releases"
+msgstr "שיחרורים חדשים"
+
+msgctxt "#11007"
+msgid "Save to My Music"
+msgstr "לשמור אל המוזיקה שלי"
+
+msgctxt "#11008"
+msgid "Remove from My Music"
+msgstr "הסר מהמוזיקה שלי"
+
+msgctxt "#11009"
+msgid "Follow"
+msgstr "עקוב"
+
+msgctxt "#11010"
+msgid "Unfollow"
+msgstr "ביטול מעקב"
+
+msgctxt "#11011"
+msgid "Artist top tracks"
+msgstr "השירים הכי טובים של האמן"
+
+msgctxt "#11012"
+msgid "Related artists"
+msgstr "אמנים קשורים"
+
+msgctxt "#11013"
+msgid "My Music"
+msgstr "המוזיקה שלי"
+
+msgctxt "#11014"
+msgid "Explore"
+msgstr "חקור"
+
+msgctxt "#11015"
+msgid "Featured playlists"
+msgstr "רשימות ניגון מומלצות"
+
+msgctxt "#11016"
+msgid "New releases"
+msgstr "שיחרורים חדשים"
+
+msgctxt "#11017"
+msgid "Remove from playlist"
+msgstr "הסר מרשימת ניגון"
+
+msgctxt "#11018"
+msgid "All albums for artist"
+msgstr "כל האלבומים עבור אמן"
+
+msgctxt "#11020"
+msgid "Default view for categories"
+msgstr ""
+
+msgctxt "#11023"
+msgid "Most played artists"
+msgstr "האמנים הכי מושמעים"
+
+msgctxt "#11024"
+msgid "Most played tracks"
+msgstr "השירים הכי מושמעים"
+
+msgctxt "#11025"
+msgid "Follow artist"
+msgstr "עקוב אחר האמן"
+
+msgctxt "#11026"
+msgid "Unfollow artist"
+msgstr "בטל עקיבה אחר האמן"
+
+msgctxt "#11027"
+msgid "Refresh listing"
+msgstr "רענן את הרישום"
+
+msgctxt "#11028"
+msgid "Login details"
+msgstr "פרטי התחברות"
+
+msgctxt "#11030"
+msgid "Append artist name to song title"
+msgstr "הוסף שם אמן לכותרת השיר"
+
+msgctxt "#11031"
+msgid "Default view for playlists"
+msgstr "תצוגת ברירת המחדל עבור רשימות ניגון"
+
+msgctxt "#11032"
+msgid "Default view for artist list"
+msgstr "תצוגת ברירת המחדל עבור רשימת האמנים"
+
+msgctxt "#11033"
+msgid "Default view for album list"
+msgstr "תצוגת ברירת המחדל עבור רשימת אלבומים"
+
+msgctxt "#11034"
+msgid "Default view for song list"
+msgstr "תצוגת ברירת המחדל עבור רשימת השירים"
+
+msgctxt "#11047"
+msgid "Current user"
+msgstr "משתמש נוכחי"
+
+msgctxt "#11050"
+msgid ""
+"Spotify login failed. Either no credentials have been set or the Spotify username or password is incorrect.\n"
+"Please check your username and password in the addon settings."
+msgstr ""
+"לא הוגדרו אישורי כניסה או שהחיבור נכשל.\n"
+"הזן את הפרטים שלך בתיבת הדו-שיח הגדרות."
+
+msgctxt "#11054"
+msgid "Audio"
+msgstr "אודיו"
+
+msgctxt "#11055"
+msgid "Views"
+msgstr "צפיות"
+
+msgctxt "#11069"
+msgid "My recently played playlist"
+msgstr "My recently played playlist"
+
+msgctxt "#11070"
+msgid "Gap between tracks when playing a playlist (secs)"
+msgstr "Gap between tracks when playing a playlist (secs)"
+
+msgctxt "#11071"
+msgid ""
+"To give better audio streaming from Spotify, a video http rule was just added to 'userdata/playercorefactory.xml'.\n"
+"Please restart Kodi for this to take affect."
+msgstr ""
+"To give better audio streaming from Spotify, a video http rule was just added to 'userdata/playercorefactory.xml'.\n"
+"Please restart Kodi for this to take affect."
+
+msgctxt "#11072"
+msgid "Clear the plugin cache"
+msgstr "Clear the plugin cache"
+
+msgctxt "#11073"
+msgid "Followed artists"
+msgstr "Followed artists"
+
+msgctxt "#11074"
+msgid ""
+"Successfully cleared the plugin cache database.\n"
+"Please restart Kodi for this to take affect."
+msgstr ""
+"Successfully cleared the plugin cache database.\n"
+"Please restart Kodi for this to take affect."
+
+msgctxt "#11075"
+msgid "Use Spotify normalization when playing tracks"
+msgstr ""

resources/language/resource.language.nl_nl/strings.po

@@ -0,0 +1,179 @@
+# Kodi Media Center language file
+# Addon Name: Spotify
+# Addon id: plugin.audio.spotify
+# Addon Provider: marcelveldt
+msgid ""
+msgstr ""
+"Project-Id-Version: Kodi-Addons\n"
+"Report-Msgid-Bugs-To: alanwww1@xbmc.org\n"
+"POT-Creation-Date: 2015-11-04 18:30+0100\n"
+"PO-Revision-Date: 2019-07-18 15:34+0200\n"
+"Last-Translator: logi85\n"
+"Language-Team: Dutch\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Language: nl\n"
+"Plural-Forms: nplurals=2; plural=(n != 1);\n"
+"X-Generator: Poedit 2.2.3\n"
+
+msgctxt "#11001"
+msgid "Username"
+msgstr "Gebruikersnaam"
+
+msgctxt "#11002"
+msgid "Password"
+msgstr "Wachtwoord"
+
+msgctxt "#11005"
+msgid "New releases"
+msgstr "Nieuwe releases"
+
+msgctxt "#11007"
+msgid "Save to My Music"
+msgstr "Opslaan naar Mijn Muziek"
+
+msgctxt "#11008"
+msgid "Remove from My Music"
+msgstr "Verwijder uit Mijn Muziek"
+
+msgctxt "#11009"
+msgid "Follow"
+msgstr "Volgen"
+
+msgctxt "#11010"
+msgid "Unfollow"
+msgstr "Niet meer volgen"
+
+msgctxt "#11011"
+msgid "Artist top tracks"
+msgstr "Artiest top-nummers"
+
+msgctxt "#11012"
+msgid "Related artists"
+msgstr "Gerelateerde artiesten"
+
+msgctxt "#11013"
+msgid "My Music"
+msgstr "Mijn Muziek"
+
+msgctxt "#11014"
+msgid "Explore"
+msgstr "Verkennen"
+
+msgctxt "#11015"
+msgid "Featured playlists"
+msgstr "Aanbevolen afspeellijsten"
+
+msgctxt "#11016"
+msgid "New releases"
+msgstr "Nieuwe releases"
+
+msgctxt "#11017"
+msgid "Remove from playlist"
+msgstr "Verwijder uit afspeellijst"
+
+msgctxt "#11018"
+msgid "All albums for artist"
+msgstr "Alle albums van artiest"
+
+msgctxt "#11020"
+msgid "Default view for categories"
+msgstr ""
+
+msgctxt "#11023"
+msgid "Most played artists"
+msgstr "Meest afgespeelde artiesten"
+
+msgctxt "#11024"
+msgid "Most played tracks"
+msgstr "Meest afgespeelde liedjes"
+
+msgctxt "#11025"
+msgid "Follow artist"
+msgstr "Volg artiest"
+
+msgctxt "#11026"
+msgid "Unfollow artist"
+msgstr "Artiest niet volgen"
+
+msgctxt "#11027"
+msgid "Refresh listing"
+msgstr "Lijst vernieuwen"
+
+msgctxt "#11036"
+msgid "Enable this device as Spotify Connect target (experimental)"
+msgstr "Schakel dit apparaat in als Spotify Connect doel (experimenteel)"
+
+msgctxt "#11031"
+msgid "Default view for playlists"
+msgstr ""
+
+msgctxt "#11032"
+msgid "Default view for artist list"
+msgstr ""
+
+msgctxt "#11033"
+msgid "Default view for album list"
+msgstr ""
+
+msgctxt "#11034"
+msgid "Default view for song list"
+msgstr ""
+
+msgctxt "#11047"
+msgid "Current user"
+msgstr "Huidige gebruiker"
+
+msgctxt "#11050"
+msgid ""
+"Spotify login failed. Either no credentials have been set or the Spotify username or password is incorrect.\n"
+"Please check your username and password in the addon settings."
+msgstr ""
+"Er zijn geen inloggegevens gevonden of het inloggen faalt.\n"
+"Voer alsjeblieft je inloggegevens in in de plugin instellingen."
+
+msgctxt "#11054"
+msgid "Audio"
+msgstr "Audio"
+
+#, fuzzy
+msgctxt "#11055"
+msgid "Views"
+msgstr "Weergave"
+
+msgctxt "#11069"
+msgid "My recently played playlist"
+msgstr "My recently played playlist"
+
+msgctxt "#11070"
+msgid "Gap between tracks when playing a playlist (secs)"
+msgstr "Gap between tracks when playing a playlist (secs)"
+
+msgctxt "#11071"
+msgid ""
+"To give better audio streaming from Spotify, a video http rule was just added to 'userdata/playercorefactory.xml'.\n"
+"Please restart Kodi for this to take affect."
+msgstr ""
+"To give better audio streaming from Spotify, a video http rule was just added to 'userdata/playercorefactory.xml'.\n"
+"Please restart Kodi for this to take affect."
+
+msgctxt "#11072"
+msgid "Clear the plugin cache"
+msgstr "Clear the plugin cache"
+
+msgctxt "#11073"
+msgid "Followed artists"
+msgstr "Followed artists"
+
+msgctxt "#11074"
+msgid ""
+"Successfully cleared the plugin cache database.\n"
+"Please restart Kodi for this to take affect."
+msgstr ""
+"Successfully cleared the plugin cache database.\n"
+"Please restart Kodi for this to take affect."
+
+msgctxt "#11075"
+msgid "Use Spotify normalization when playing tracks"
+msgstr ""

resources/lib/__init__.py

@@ -0,0 +1,50 @@
+import os
+import sys
+
+sys.path.insert(1, os.path.join(os.path.dirname(__file__)))
+
+# IMPORTANT: The 'cherrypy' module cannot be imported as a submodule from 'httpproxy.py'.
+#   I.e, 'from deps import cherrypy' will not work. Not sure why. So we do the following
+#   path hack to put 'cherrypy' on the module search path:
+sys.path.insert(1, os.path.join(os.path.dirname(__file__), "deps"))
+
+
+# import pkgutil
+
+# def list_submodules(list_name, package_name):
+#     for loader, module_name, is_pkg in pkgutil.walk_packages(
+#         package_name.__path__, package_name.__name__ + "."
+#     ):
+#         list_name.append(module_name)
+#         print(f"module_name 1 = {module_name}, is_pkg = {is_pkg}.")
+#         try:
+#             module_name = __import__(module_name, fromlist="dummylist")
+#         except Exception as ex:
+#             print(ex)
+#             module_name = None
+#         print(f"module_name 2 = {module_name}.")
+#         if is_pkg:
+#             list_submodules(list_name, module_name)
+#
+#
+# if len(sys.argv) != 2:
+#     print("Usage: {} [PACKAGE-NAME]".format(os.path.basename(__file__)))
+#     sys.exit(1)
+# else:
+#     package_name = sys.argv[1]
+#
+# print(f"package_name = '{package_name}'.")
+# try:
+#     package = __import__(package_name)
+# except ImportError:
+#     print("Package {} not found...".format(package_name))
+#     sys.exit(1)
+#
+# print(f"package.__path__ = '{package.__path__}'.")
+# print(f"package.__name__ = '{package.__name__}'.")
+#
+# all_modules = []
+# list_submodules(all_modules, package)
+#
+# print(f"all_modules = {all_modules}.")
+# sys.exit(1)

resources/lib/bottle_manager.py

@@ -0,0 +1,61 @@
+from wsgiref.simple_server import make_server
+
+from bottle import app, request, HTTPResponse, Bottle
+import xbmc
+
+import re
+
+from librespot.core import Session
+from librespot.audio.decoders import AudioQuality, VorbisOnlyAudioQuality
+from librespot.metadata import TrackId
+
+from utils import log_msg
+
+class LibrespotServer(Bottle):
+    def __init__(self, session: Session):
+        super(LibrespotServer, self).__init__()
+        self.session: Session = session
+        self.route('/track/<track_id>', callback=self.stream)
+
+    # TODO: Make Range header work PLEASE I BEG
+
+    def stream(self, track_id):
+        try:
+            playabletrack_id = TrackId.from_uri(f"spotify:track:{track_id}")
+            stream = self.session.content_feeder().load(
+                playabletrack_id, VorbisOnlyAudioQuality(AudioQuality.NORMAL), False,
+                None)
+            start = 0
+            end = stream.input_stream.size
+            payload = stream.input_stream.stream()
+            log_msg(stream.input_stream.size)
+            # reqrange = request.get_header("range")
+            # if reqrange is not None:
+            #     range_search = re.search(
+            #         "^bytes=(?P<start>[0-9]+?)-(?P<end>[0-9]+?)$",
+            #         reqrange)
+            #     if range_search is not None:
+            #         start = int(range_search.group("start"))
+            #         end = (int(range_search.group("end"))
+            #                 if int(range_search.group("end")) <=
+            #                 stream.input_stream.size else
+            #                 stream.input_stream.size)
+            #         payload.skip(start)
+            #     else:
+            #         payload = stream
+            response = HTTPResponse(body=payload)
+            response.add_header('Content-Type', 'audio/ogg')
+            # response.add_header('Accept-Ranges', 'bytes')
+            # response.add_header("Content-Length", str(stream.input_stream.size).encode() if
+            #                 stream.input_stream.size == end else "{}-{}/{}"
+            #                 .format(start, end,
+            #                         stream.input_stream.size).encode())
+            return response
+        except Exception as e:
+            log_msg(e)
+
+def start_thread(web_port: int) -> None:
+    httpd = make_server('127.0.0.1', web_port, app)
+    monitor = xbmc.Monitor()
+    while not monitor.abortRequested():
+        httpd.handle_request()

resources/lib/defusedxml/ElementTree.py

@@ -0,0 +1,154 @@
+# defusedxml
+#
+# Copyright (c) 2013 by Christian Heimes <christian@python.org>
+# Licensed to PSF under a Contributor Agreement.
+# See https://www.python.org/psf/license for licensing details.
+"""Defused xml.etree.ElementTree facade
+"""
+from __future__ import print_function, absolute_import
+
+import sys
+import warnings
+from xml.etree.ElementTree import ParseError
+from xml.etree.ElementTree import TreeBuilder as _TreeBuilder
+from xml.etree.ElementTree import parse as _parse
+from xml.etree.ElementTree import tostring
+
+from .common import PY3
+
+if PY3:
+    import importlib
+else:
+    from xml.etree.ElementTree import XMLParser as _XMLParser
+    from xml.etree.ElementTree import iterparse as _iterparse
+
+
+from .common import (
+    DTDForbidden,
+    EntitiesForbidden,
+    ExternalReferenceForbidden,
+    _generate_etree_functions,
+)
+
+__origin__ = "xml.etree.ElementTree"
+
+
+def _get_py3_cls():
+    """Python 3.3 hides the pure Python code but defusedxml requires it.
+
+    The code is based on test.support.import_fresh_module().
+    """
+    pymodname = "xml.etree.ElementTree"
+    cmodname = "_elementtree"
+
+    pymod = sys.modules.pop(pymodname, None)
+    cmod = sys.modules.pop(cmodname, None)
+
+    sys.modules[cmodname] = None
+    try:
+        pure_pymod = importlib.import_module(pymodname)
+    finally:
+        # restore module
+        sys.modules[pymodname] = pymod
+        if cmod is not None:
+            sys.modules[cmodname] = cmod
+        else:
+            sys.modules.pop(cmodname, None)
+        # restore attribute on original package
+        etree_pkg = sys.modules["xml.etree"]
+        if pymod is not None:
+            etree_pkg.ElementTree = pymod
+        elif hasattr(etree_pkg, "ElementTree"):
+            del etree_pkg.ElementTree
+
+    _XMLParser = pure_pymod.XMLParser
+    _iterparse = pure_pymod.iterparse
+    # patch pure module to use ParseError from C extension
+    pure_pymod.ParseError = ParseError
+
+    return _XMLParser, _iterparse
+
+
+if PY3:
+    _XMLParser, _iterparse = _get_py3_cls()
+
+
+_sentinel = object()
+
+
+class DefusedXMLParser(_XMLParser):
+    def __init__(
+        self,
+        html=_sentinel,
+        target=None,
+        encoding=None,
+        forbid_dtd=False,
+        forbid_entities=True,
+        forbid_external=True,
+    ):
+        # Python 2.x old style class
+        _XMLParser.__init__(self, target=target, encoding=encoding)
+        if html is not _sentinel:
+            # the 'html' argument has been deprecated and ignored in all
+            # supported versions of Python. Python 3.8 finally removed it.
+            if html:
+                raise TypeError("'html=True' is no longer supported.")
+            else:
+                warnings.warn(
+                    "'html' keyword argument is no longer supported. Pass "
+                    "in arguments as keyword arguments.",
+                    category=DeprecationWarning,
+                )
+
+        self.forbid_dtd = forbid_dtd
+        self.forbid_entities = forbid_entities
+        self.forbid_external = forbid_external
+        if PY3:
+            parser = self.parser
+        else:
+            parser = self._parser
+        if self.forbid_dtd:
+            parser.StartDoctypeDeclHandler = self.defused_start_doctype_decl
+        if self.forbid_entities:
+            parser.EntityDeclHandler = self.defused_entity_decl
+            parser.UnparsedEntityDeclHandler = self.defused_unparsed_entity_decl
+        if self.forbid_external:
+            parser.ExternalEntityRefHandler = self.defused_external_entity_ref_handler
+
+    def defused_start_doctype_decl(self, name, sysid, pubid, has_internal_subset):
+        raise DTDForbidden(name, sysid, pubid)
+
+    def defused_entity_decl(
+        self, name, is_parameter_entity, value, base, sysid, pubid, notation_name
+    ):
+        raise EntitiesForbidden(name, value, base, sysid, pubid, notation_name)
+
+    def defused_unparsed_entity_decl(self, name, base, sysid, pubid, notation_name):
+        # expat 1.2
+        raise EntitiesForbidden(name, None, base, sysid, pubid, notation_name)  # pragma: no cover
+
+    def defused_external_entity_ref_handler(self, context, base, sysid, pubid):
+        raise ExternalReferenceForbidden(context, base, sysid, pubid)
+
+
+# aliases
+# XMLParse is a typo, keep it for backwards compatibility
+XMLTreeBuilder = XMLParse = XMLParser = DefusedXMLParser
+
+parse, iterparse, fromstring = _generate_etree_functions(
+    DefusedXMLParser, _TreeBuilder, _parse, _iterparse
+)
+XML = fromstring
+
+
+__all__ = [
+    "ParseError",
+    "XML",
+    "XMLParse",
+    "XMLParser",
+    "XMLTreeBuilder",
+    "fromstring",
+    "iterparse",
+    "parse",
+    "tostring",
+]

resources/lib/defusedxml/__init__.py

@@ -0,0 +1,67 @@
+# defusedxml
+#
+# Copyright (c) 2013 by Christian Heimes <christian@python.org>
+# Licensed to PSF under a Contributor Agreement.
+# See https://www.python.org/psf/license for licensing details.
+"""Defuse XML bomb denial of service vulnerabilities
+"""
+from __future__ import print_function, absolute_import
+
+import warnings
+
+from .common import (
+    DefusedXmlException,
+    DTDForbidden,
+    EntitiesForbidden,
+    ExternalReferenceForbidden,
+    NotSupportedError,
+    _apply_defusing,
+)
+
+
+def defuse_stdlib():
+    """Monkey patch and defuse all stdlib packages
+
+    :warning: The monkey patch is an EXPERIMETNAL feature.
+    """
+    defused = {}
+
+    with warnings.catch_warnings():
+        from . import cElementTree
+    from . import ElementTree
+    from . import minidom
+    from . import pulldom
+    from . import sax
+    from . import expatbuilder
+    from . import expatreader
+    from . import xmlrpc
+
+    xmlrpc.monkey_patch()
+    defused[xmlrpc] = None
+
+    defused_mods = [
+        cElementTree,
+        ElementTree,
+        minidom,
+        pulldom,
+        sax,
+        expatbuilder,
+        expatreader,
+    ]
+
+    for defused_mod in defused_mods:
+        stdlib_mod = _apply_defusing(defused_mod)
+        defused[defused_mod] = stdlib_mod
+
+    return defused
+
+
+__version__ = "0.7.1"
+
+__all__ = [
+    "DefusedXmlException",
+    "DTDForbidden",
+    "EntitiesForbidden",
+    "ExternalReferenceForbidden",
+    "NotSupportedError",
+]

resources/lib/defusedxml/cElementTree.py

@@ -0,0 +1,62 @@
+# defusedxml
+#
+# Copyright (c) 2013 by Christian Heimes <christian@python.org>
+# Licensed to PSF under a Contributor Agreement.
+# See https://www.python.org/psf/license for licensing details.
+"""Defused xml.etree.cElementTree
+"""
+from __future__ import absolute_import
+
+import warnings
+
+from .common import _generate_etree_functions
+
+from xml.etree.cElementTree import TreeBuilder as _TreeBuilder
+from xml.etree.cElementTree import parse as _parse
+from xml.etree.cElementTree import tostring
+
+# iterparse from ElementTree!
+from xml.etree.ElementTree import iterparse as _iterparse
+
+# This module is an alias for ElementTree just like xml.etree.cElementTree
+from .ElementTree import (
+    XML,
+    XMLParse,
+    XMLParser,
+    XMLTreeBuilder,
+    fromstring,
+    iterparse,
+    parse,
+    tostring,
+    DefusedXMLParser,
+    ParseError,
+)
+
+__origin__ = "xml.etree.cElementTree"
+
+
+warnings.warn(
+    "defusedxml.cElementTree is deprecated, import from defusedxml.ElementTree instead.",
+    category=DeprecationWarning,
+    stacklevel=2,
+)
+
+# XMLParse is a typo, keep it for backwards compatibility
+XMLTreeBuilder = XMLParse = XMLParser = DefusedXMLParser
+
+parse, iterparse, fromstring = _generate_etree_functions(
+    DefusedXMLParser, _TreeBuilder, _parse, _iterparse
+)
+XML = fromstring
+
+__all__ = [
+    "ParseError",
+    "XML",
+    "XMLParse",
+    "XMLParser",
+    "XMLTreeBuilder",
+    "fromstring",
+    "iterparse",
+    "parse",
+    "tostring",
+]

resources/lib/defusedxml/common.py

@@ -0,0 +1,129 @@
+# defusedxml
+#
+# Copyright (c) 2013 by Christian Heimes <christian@python.org>
+# Licensed to PSF under a Contributor Agreement.
+# See https://www.python.org/psf/license for licensing details.
+"""Common constants, exceptions and helpe functions
+"""
+import sys
+import xml.parsers.expat
+
+PY3 = sys.version_info[0] == 3
+
+# Fail early when pyexpat is not installed correctly
+if not hasattr(xml.parsers.expat, "ParserCreate"):
+    raise ImportError("pyexpat")  # pragma: no cover
+
+
+class DefusedXmlException(ValueError):
+    """Base exception"""
+
+    def __repr__(self):
+        return str(self)
+
+
+class DTDForbidden(DefusedXmlException):
+    """Document type definition is forbidden"""
+
+    def __init__(self, name, sysid, pubid):
+        super(DTDForbidden, self).__init__()
+        self.name = name
+        self.sysid = sysid
+        self.pubid = pubid
+
+    def __str__(self):
+        tpl = "DTDForbidden(name='{}', system_id={!r}, public_id={!r})"
+        return tpl.format(self.name, self.sysid, self.pubid)
+
+
+class EntitiesForbidden(DefusedXmlException):
+    """Entity definition is forbidden"""
+
+    def __init__(self, name, value, base, sysid, pubid, notation_name):
+        super(EntitiesForbidden, self).__init__()
+        self.name = name
+        self.value = value
+        self.base = base
+        self.sysid = sysid
+        self.pubid = pubid
+        self.notation_name = notation_name
+
+    def __str__(self):
+        tpl = "EntitiesForbidden(name='{}', system_id={!r}, public_id={!r})"
+        return tpl.format(self.name, self.sysid, self.pubid)
+
+
+class ExternalReferenceForbidden(DefusedXmlException):
+    """Resolving an external reference is forbidden"""
+
+    def __init__(self, context, base, sysid, pubid):
+        super(ExternalReferenceForbidden, self).__init__()
+        self.context = context
+        self.base = base
+        self.sysid = sysid
+        self.pubid = pubid
+
+    def __str__(self):
+        tpl = "ExternalReferenceForbidden(system_id='{}', public_id={})"
+        return tpl.format(self.sysid, self.pubid)
+
+
+class NotSupportedError(DefusedXmlException):
+    """The operation is not supported"""
+
+
+def _apply_defusing(defused_mod):
+    assert defused_mod is sys.modules[defused_mod.__name__]
+    stdlib_name = defused_mod.__origin__
+    __import__(stdlib_name, {}, {}, ["*"])
+    stdlib_mod = sys.modules[stdlib_name]
+    stdlib_names = set(dir(stdlib_mod))
+    for name, obj in vars(defused_mod).items():
+        if name.startswith("_") or name not in stdlib_names:
+            continue
+        setattr(stdlib_mod, name, obj)
+    return stdlib_mod
+
+
+def _generate_etree_functions(DefusedXMLParser, _TreeBuilder, _parse, _iterparse):
+    """Factory for functions needed by etree, dependent on whether
+    cElementTree or ElementTree is used."""
+
+    def parse(source, parser=None, forbid_dtd=False, forbid_entities=True, forbid_external=True):
+        if parser is None:
+            parser = DefusedXMLParser(
+                target=_TreeBuilder(),
+                forbid_dtd=forbid_dtd,
+                forbid_entities=forbid_entities,
+                forbid_external=forbid_external,
+            )
+        return _parse(source, parser)
+
+    def iterparse(
+        source,
+        events=None,
+        parser=None,
+        forbid_dtd=False,
+        forbid_entities=True,
+        forbid_external=True,
+    ):
+        if parser is None:
+            parser = DefusedXMLParser(
+                target=_TreeBuilder(),
+                forbid_dtd=forbid_dtd,
+                forbid_entities=forbid_entities,
+                forbid_external=forbid_external,
+            )
+        return _iterparse(source, events, parser)
+
+    def fromstring(text, forbid_dtd=False, forbid_entities=True, forbid_external=True):
+        parser = DefusedXMLParser(
+            target=_TreeBuilder(),
+            forbid_dtd=forbid_dtd,
+            forbid_entities=forbid_entities,
+            forbid_external=forbid_external,
+        )
+        parser.feed(text)
+        return parser.close()
+
+    return parse, iterparse, fromstring

resources/lib/defusedxml/expatbuilder.py

@@ -0,0 +1,107 @@
+# defusedxml
+#
+# Copyright (c) 2013 by Christian Heimes <christian@python.org>
+# Licensed to PSF under a Contributor Agreement.
+# See https://www.python.org/psf/license for licensing details.
+"""Defused xml.dom.expatbuilder
+"""
+from __future__ import print_function, absolute_import
+
+from xml.dom.expatbuilder import ExpatBuilder as _ExpatBuilder
+from xml.dom.expatbuilder import Namespaces as _Namespaces
+
+from .common import DTDForbidden, EntitiesForbidden, ExternalReferenceForbidden
+
+__origin__ = "xml.dom.expatbuilder"
+
+
+class DefusedExpatBuilder(_ExpatBuilder):
+    """Defused document builder"""
+
+    def __init__(
+        self, options=None, forbid_dtd=False, forbid_entities=True, forbid_external=True
+    ):
+        _ExpatBuilder.__init__(self, options)
+        self.forbid_dtd = forbid_dtd
+        self.forbid_entities = forbid_entities
+        self.forbid_external = forbid_external
+
+    def defused_start_doctype_decl(self, name, sysid, pubid, has_internal_subset):
+        raise DTDForbidden(name, sysid, pubid)
+
+    def defused_entity_decl(
+        self, name, is_parameter_entity, value, base, sysid, pubid, notation_name
+    ):
+        raise EntitiesForbidden(name, value, base, sysid, pubid, notation_name)
+
+    def defused_unparsed_entity_decl(self, name, base, sysid, pubid, notation_name):
+        # expat 1.2
+        raise EntitiesForbidden(name, None, base, sysid, pubid, notation_name)  # pragma: no cover
+
+    def defused_external_entity_ref_handler(self, context, base, sysid, pubid):
+        raise ExternalReferenceForbidden(context, base, sysid, pubid)
+
+    def install(self, parser):
+        _ExpatBuilder.install(self, parser)
+
+        if self.forbid_dtd:
+            parser.StartDoctypeDeclHandler = self.defused_start_doctype_decl
+        if self.forbid_entities:
+            # if self._options.entities:
+            parser.EntityDeclHandler = self.defused_entity_decl
+            parser.UnparsedEntityDeclHandler = self.defused_unparsed_entity_decl
+        if self.forbid_external:
+            parser.ExternalEntityRefHandler = self.defused_external_entity_ref_handler
+
+
+class DefusedExpatBuilderNS(_Namespaces, DefusedExpatBuilder):
+    """Defused document builder that supports namespaces."""
+
+    def install(self, parser):
+        DefusedExpatBuilder.install(self, parser)
+        if self._options.namespace_declarations:
+            parser.StartNamespaceDeclHandler = self.start_namespace_decl_handler
+
+    def reset(self):
+        DefusedExpatBuilder.reset(self)
+        self._initNamespaces()
+
+
+def parse(file, namespaces=True, forbid_dtd=False, forbid_entities=True, forbid_external=True):
+    """Parse a document, returning the resulting Document node.
+
+    'file' may be either a file name or an open file object.
+    """
+    if namespaces:
+        build_builder = DefusedExpatBuilderNS
+    else:
+        build_builder = DefusedExpatBuilder
+    builder = build_builder(
+        forbid_dtd=forbid_dtd, forbid_entities=forbid_entities, forbid_external=forbid_external
+    )
+
+    if isinstance(file, str):
+        fp = open(file, "rb")
+        try:
+            result = builder.parseFile(fp)
+        finally:
+            fp.close()
+    else:
+        result = builder.parseFile(file)
+    return result
+
+
+def parseString(
+    string, namespaces=True, forbid_dtd=False, forbid_entities=True, forbid_external=True
+):
+    """Parse a document from a string, returning the resulting
+    Document node.
+    """
+    if namespaces:
+        build_builder = DefusedExpatBuilderNS
+    else:
+        build_builder = DefusedExpatBuilder
+    builder = build_builder(
+        forbid_dtd=forbid_dtd, forbid_entities=forbid_entities, forbid_external=forbid_external
+    )
+    return builder.parseString(string)

resources/lib/defusedxml/expatreader.py

@@ -0,0 +1,61 @@
+# defusedxml
+#
+# Copyright (c) 2013 by Christian Heimes <christian@python.org>
+# Licensed to PSF under a Contributor Agreement.
+# See https://www.python.org/psf/license for licensing details.
+"""Defused xml.sax.expatreader
+"""
+from __future__ import print_function, absolute_import
+
+from xml.sax.expatreader import ExpatParser as _ExpatParser
+
+from .common import DTDForbidden, EntitiesForbidden, ExternalReferenceForbidden
+
+__origin__ = "xml.sax.expatreader"
+
+
+class DefusedExpatParser(_ExpatParser):
+    """Defused SAX driver for the pyexpat C module."""
+
+    def __init__(
+        self,
+        namespaceHandling=0,
+        bufsize=2 ** 16 - 20,
+        forbid_dtd=False,
+        forbid_entities=True,
+        forbid_external=True,
+    ):
+        _ExpatParser.__init__(self, namespaceHandling, bufsize)
+        self.forbid_dtd = forbid_dtd
+        self.forbid_entities = forbid_entities
+        self.forbid_external = forbid_external
+
+    def defused_start_doctype_decl(self, name, sysid, pubid, has_internal_subset):
+        raise DTDForbidden(name, sysid, pubid)
+
+    def defused_entity_decl(
+        self, name, is_parameter_entity, value, base, sysid, pubid, notation_name
+    ):
+        raise EntitiesForbidden(name, value, base, sysid, pubid, notation_name)
+
+    def defused_unparsed_entity_decl(self, name, base, sysid, pubid, notation_name):
+        # expat 1.2
+        raise EntitiesForbidden(name, None, base, sysid, pubid, notation_name)  # pragma: no cover
+
+    def defused_external_entity_ref_handler(self, context, base, sysid, pubid):
+        raise ExternalReferenceForbidden(context, base, sysid, pubid)
+
+    def reset(self):
+        _ExpatParser.reset(self)
+        parser = self._parser
+        if self.forbid_dtd:
+            parser.StartDoctypeDeclHandler = self.defused_start_doctype_decl
+        if self.forbid_entities:
+            parser.EntityDeclHandler = self.defused_entity_decl
+            parser.UnparsedEntityDeclHandler = self.defused_unparsed_entity_decl
+        if self.forbid_external:
+            parser.ExternalEntityRefHandler = self.defused_external_entity_ref_handler
+
+
+def create_parser(*args, **kwargs):
+    return DefusedExpatParser(*args, **kwargs)

resources/lib/defusedxml/lxml.py

@@ -0,0 +1,153 @@
+# defusedxml
+#
+# Copyright (c) 2013 by Christian Heimes <christian@python.org>
+# Licensed to PSF under a Contributor Agreement.
+# See https://www.python.org/psf/license for licensing details.
+"""DEPRECATED Example code for lxml.etree protection
+
+The code has NO protection against decompression bombs.
+"""
+from __future__ import print_function, absolute_import
+
+import threading
+import warnings
+
+from lxml import etree as _etree
+
+from .common import DTDForbidden, EntitiesForbidden, NotSupportedError
+
+LXML3 = _etree.LXML_VERSION[0] >= 3
+
+__origin__ = "lxml.etree"
+
+tostring = _etree.tostring
+
+
+warnings.warn(
+    "defusedxml.lxml is no longer supported and will be removed in a future release.",
+    category=DeprecationWarning,
+    stacklevel=2,
+)
+
+
+class RestrictedElement(_etree.ElementBase):
+    """A restricted Element class that filters out instances of some classes"""
+
+    __slots__ = ()
+    # blacklist = (etree._Entity, etree._ProcessingInstruction, etree._Comment)
+    blacklist = _etree._Entity
+
+    def _filter(self, iterator):
+        blacklist = self.blacklist
+        for child in iterator:
+            if isinstance(child, blacklist):
+                continue
+            yield child
+
+    def __iter__(self):
+        iterator = super(RestrictedElement, self).__iter__()
+        return self._filter(iterator)
+
+    def iterchildren(self, tag=None, reversed=False):
+        iterator = super(RestrictedElement, self).iterchildren(tag=tag, reversed=reversed)
+        return self._filter(iterator)
+
+    def iter(self, tag=None, *tags):
+        iterator = super(RestrictedElement, self).iter(tag=tag, *tags)
+        return self._filter(iterator)
+
+    def iterdescendants(self, tag=None, *tags):
+        iterator = super(RestrictedElement, self).iterdescendants(tag=tag, *tags)
+        return self._filter(iterator)
+
+    def itersiblings(self, tag=None, preceding=False):
+        iterator = super(RestrictedElement, self).itersiblings(tag=tag, preceding=preceding)
+        return self._filter(iterator)
+
+    def getchildren(self):
+        iterator = super(RestrictedElement, self).__iter__()
+        return list(self._filter(iterator))
+
+    def getiterator(self, tag=None):
+        iterator = super(RestrictedElement, self).getiterator(tag)
+        return self._filter(iterator)
+
+
+class GlobalParserTLS(threading.local):
+    """Thread local context for custom parser instances"""
+
+    parser_config = {
+        "resolve_entities": False,
+        # 'remove_comments': True,
+        # 'remove_pis': True,
+    }
+
+    element_class = RestrictedElement
+
+    def createDefaultParser(self):
+        parser = _etree.XMLParser(**self.parser_config)
+        element_class = self.element_class
+        if self.element_class is not None:
+            lookup = _etree.ElementDefaultClassLookup(element=element_class)
+            parser.set_element_class_lookup(lookup)
+        return parser
+
+    def setDefaultParser(self, parser):
+        self._default_parser = parser
+
+    def getDefaultParser(self):
+        parser = getattr(self, "_default_parser", None)
+        if parser is None:
+            parser = self.createDefaultParser()
+            self.setDefaultParser(parser)
+        return parser
+
+
+_parser_tls = GlobalParserTLS()
+getDefaultParser = _parser_tls.getDefaultParser
+
+
+def check_docinfo(elementtree, forbid_dtd=False, forbid_entities=True):
+    """Check docinfo of an element tree for DTD and entity declarations
+
+    The check for entity declarations needs lxml 3 or newer. lxml 2.x does
+    not support dtd.iterentities().
+    """
+    docinfo = elementtree.docinfo
+    if docinfo.doctype:
+        if forbid_dtd:
+            raise DTDForbidden(docinfo.doctype, docinfo.system_url, docinfo.public_id)
+        if forbid_entities and not LXML3:
+            # lxml < 3 has no iterentities()
+            raise NotSupportedError("Unable to check for entity declarations " "in lxml 2.x")
+
+    if forbid_entities:
+        for dtd in docinfo.internalDTD, docinfo.externalDTD:
+            if dtd is None:
+                continue
+            for entity in dtd.iterentities():
+                raise EntitiesForbidden(entity.name, entity.content, None, None, None, None)
+
+
+def parse(source, parser=None, base_url=None, forbid_dtd=False, forbid_entities=True):
+    if parser is None:
+        parser = getDefaultParser()
+    elementtree = _etree.parse(source, parser, base_url=base_url)
+    check_docinfo(elementtree, forbid_dtd, forbid_entities)
+    return elementtree
+
+
+def fromstring(text, parser=None, base_url=None, forbid_dtd=False, forbid_entities=True):
+    if parser is None:
+        parser = getDefaultParser()
+    rootelement = _etree.fromstring(text, parser, base_url=base_url)
+    elementtree = rootelement.getroottree()
+    check_docinfo(elementtree, forbid_dtd, forbid_entities)
+    return rootelement
+
+
+XML = fromstring
+
+
+def iterparse(*args, **kwargs):
+    raise NotSupportedError("defused lxml.etree.iterparse not available")

resources/lib/defusedxml/minidom.py

@@ -0,0 +1,63 @@
+# defusedxml
+#
+# Copyright (c) 2013 by Christian Heimes <christian@python.org>
+# Licensed to PSF under a Contributor Agreement.
+# See https://www.python.org/psf/license for licensing details.
+"""Defused xml.dom.minidom
+"""
+from __future__ import print_function, absolute_import
+
+from xml.dom.minidom import _do_pulldom_parse
+from . import expatbuilder as _expatbuilder
+from . import pulldom as _pulldom
+
+__origin__ = "xml.dom.minidom"
+
+
+def parse(
+    file, parser=None, bufsize=None, forbid_dtd=False, forbid_entities=True, forbid_external=True
+):
+    """Parse a file into a DOM by filename or file object."""
+    if parser is None and not bufsize:
+        return _expatbuilder.parse(
+            file,
+            forbid_dtd=forbid_dtd,
+            forbid_entities=forbid_entities,
+            forbid_external=forbid_external,
+        )
+    else:
+        return _do_pulldom_parse(
+            _pulldom.parse,
+            (file,),
+            {
+                "parser": parser,
+                "bufsize": bufsize,
+                "forbid_dtd": forbid_dtd,
+                "forbid_entities": forbid_entities,
+                "forbid_external": forbid_external,
+            },
+        )
+
+
+def parseString(
+    string, parser=None, forbid_dtd=False, forbid_entities=True, forbid_external=True
+):
+    """Parse a file into a DOM from a string."""
+    if parser is None:
+        return _expatbuilder.parseString(
+            string,
+            forbid_dtd=forbid_dtd,
+            forbid_entities=forbid_entities,
+            forbid_external=forbid_external,
+        )
+    else:
+        return _do_pulldom_parse(
+            _pulldom.parseString,
+            (string,),
+            {
+                "parser": parser,
+                "forbid_dtd": forbid_dtd,
+                "forbid_entities": forbid_entities,
+                "forbid_external": forbid_external,
+            },
+        )

resources/lib/defusedxml/pulldom.py

@@ -0,0 +1,41 @@
+# defusedxml
+#
+# Copyright (c) 2013 by Christian Heimes <christian@python.org>
+# Licensed to PSF under a Contributor Agreement.
+# See https://www.python.org/psf/license for licensing details.
+"""Defused xml.dom.pulldom
+"""
+from __future__ import print_function, absolute_import
+
+from xml.dom.pulldom import parse as _parse
+from xml.dom.pulldom import parseString as _parseString
+from .sax import make_parser
+
+__origin__ = "xml.dom.pulldom"
+
+
+def parse(
+    stream_or_string,
+    parser=None,
+    bufsize=None,
+    forbid_dtd=False,
+    forbid_entities=True,
+    forbid_external=True,
+):
+    if parser is None:
+        parser = make_parser()
+        parser.forbid_dtd = forbid_dtd
+        parser.forbid_entities = forbid_entities
+        parser.forbid_external = forbid_external
+    return _parse(stream_or_string, parser, bufsize)
+
+
+def parseString(
+    string, parser=None, forbid_dtd=False, forbid_entities=True, forbid_external=True
+):
+    if parser is None:
+        parser = make_parser()
+        parser.forbid_dtd = forbid_dtd
+        parser.forbid_entities = forbid_entities
+        parser.forbid_external = forbid_external
+    return _parseString(string, parser)

resources/lib/defusedxml/sax.py

@@ -0,0 +1,60 @@
+# defusedxml
+#
+# Copyright (c) 2013 by Christian Heimes <christian@python.org>
+# Licensed to PSF under a Contributor Agreement.
+# See https://www.python.org/psf/license for licensing details.
+"""Defused xml.sax
+"""
+from __future__ import print_function, absolute_import
+
+from xml.sax import InputSource as _InputSource
+from xml.sax import ErrorHandler as _ErrorHandler
+
+from . import expatreader
+
+__origin__ = "xml.sax"
+
+
+def parse(
+    source,
+    handler,
+    errorHandler=_ErrorHandler(),
+    forbid_dtd=False,
+    forbid_entities=True,
+    forbid_external=True,
+):
+    parser = make_parser()
+    parser.setContentHandler(handler)
+    parser.setErrorHandler(errorHandler)
+    parser.forbid_dtd = forbid_dtd
+    parser.forbid_entities = forbid_entities
+    parser.forbid_external = forbid_external
+    parser.parse(source)
+
+
+def parseString(
+    string,
+    handler,
+    errorHandler=_ErrorHandler(),
+    forbid_dtd=False,
+    forbid_entities=True,
+    forbid_external=True,
+):
+    from io import BytesIO
+
+    if errorHandler is None:
+        errorHandler = _ErrorHandler()
+    parser = make_parser()
+    parser.setContentHandler(handler)
+    parser.setErrorHandler(errorHandler)
+    parser.forbid_dtd = forbid_dtd
+    parser.forbid_entities = forbid_entities
+    parser.forbid_external = forbid_external
+
+    inpsrc = _InputSource()
+    inpsrc.setByteStream(BytesIO(string))
+    parser.parse(inpsrc)
+
+
+def make_parser(parser_list=[]):
+    return expatreader.create_parser()

resources/lib/defusedxml/xmlrpc.py

@@ -0,0 +1,153 @@
+# defusedxml
+#
+# Copyright (c) 2013 by Christian Heimes <christian@python.org>
+# Licensed to PSF under a Contributor Agreement.
+# See https://www.python.org/psf/license for licensing details.
+"""Defused xmlrpclib
+
+Also defuses gzip bomb
+"""
+from __future__ import print_function, absolute_import
+
+import io
+
+from .common import DTDForbidden, EntitiesForbidden, ExternalReferenceForbidden, PY3
+
+if PY3:
+    __origin__ = "xmlrpc.client"
+    from xmlrpc.client import ExpatParser
+    from xmlrpc import client as xmlrpc_client
+    from xmlrpc import server as xmlrpc_server
+    from xmlrpc.client import gzip_decode as _orig_gzip_decode
+    from xmlrpc.client import GzipDecodedResponse as _OrigGzipDecodedResponse
+else:
+    __origin__ = "xmlrpclib"
+    from xmlrpclib import ExpatParser
+    import xmlrpclib as xmlrpc_client
+
+    xmlrpc_server = None
+    from xmlrpclib import gzip_decode as _orig_gzip_decode
+    from xmlrpclib import GzipDecodedResponse as _OrigGzipDecodedResponse
+
+try:
+    import gzip
+except ImportError:  # pragma: no cover
+    gzip = None
+
+
+# Limit maximum request size to prevent resource exhaustion DoS
+# Also used to limit maximum amount of gzip decoded data in order to prevent
+# decompression bombs
+# A value of -1 or smaller disables the limit
+MAX_DATA = 30 * 1024 * 1024  # 30 MB
+
+
+def defused_gzip_decode(data, limit=None):
+    """gzip encoded data -> unencoded data
+
+    Decode data using the gzip content encoding as described in RFC 1952
+    """
+    if not gzip:  # pragma: no cover
+        raise NotImplementedError
+    if limit is None:
+        limit = MAX_DATA
+    f = io.BytesIO(data)
+    gzf = gzip.GzipFile(mode="rb", fileobj=f)
+    try:
+        if limit < 0:  # no limit
+            decoded = gzf.read()
+        else:
+            decoded = gzf.read(limit + 1)
+    except IOError:  # pragma: no cover
+        raise ValueError("invalid data")
+    f.close()
+    gzf.close()
+    if limit >= 0 and len(decoded) > limit:
+        raise ValueError("max gzipped payload length exceeded")
+    return decoded
+
+
+class DefusedGzipDecodedResponse(gzip.GzipFile if gzip else object):
+    """a file-like object to decode a response encoded with the gzip
+    method, as described in RFC 1952.
+    """
+
+    def __init__(self, response, limit=None):
+        # response doesn't support tell() and read(), required by
+        # GzipFile
+        if not gzip:  # pragma: no cover
+            raise NotImplementedError
+        self.limit = limit = limit if limit is not None else MAX_DATA
+        if limit < 0:  # no limit
+            data = response.read()
+            self.readlength = None
+        else:
+            data = response.read(limit + 1)
+            self.readlength = 0
+        if limit >= 0 and len(data) > limit:
+            raise ValueError("max payload length exceeded")
+        self.stringio = io.BytesIO(data)
+        gzip.GzipFile.__init__(self, mode="rb", fileobj=self.stringio)
+
+    def read(self, n):
+        if self.limit >= 0:
+            left = self.limit - self.readlength
+            n = min(n, left + 1)
+            data = gzip.GzipFile.read(self, n)
+            self.readlength += len(data)
+            if self.readlength > self.limit:
+                raise ValueError("max payload length exceeded")
+            return data
+        else:
+            return gzip.GzipFile.read(self, n)
+
+    def close(self):
+        gzip.GzipFile.close(self)
+        self.stringio.close()
+
+
+class DefusedExpatParser(ExpatParser):
+    def __init__(self, target, forbid_dtd=False, forbid_entities=True, forbid_external=True):
+        ExpatParser.__init__(self, target)
+        self.forbid_dtd = forbid_dtd
+        self.forbid_entities = forbid_entities
+        self.forbid_external = forbid_external
+        parser = self._parser
+        if self.forbid_dtd:
+            parser.StartDoctypeDeclHandler = self.defused_start_doctype_decl
+        if self.forbid_entities:
+            parser.EntityDeclHandler = self.defused_entity_decl
+            parser.UnparsedEntityDeclHandler = self.defused_unparsed_entity_decl
+        if self.forbid_external:
+            parser.ExternalEntityRefHandler = self.defused_external_entity_ref_handler
+
+    def defused_start_doctype_decl(self, name, sysid, pubid, has_internal_subset):
+        raise DTDForbidden(name, sysid, pubid)
+
+    def defused_entity_decl(
+        self, name, is_parameter_entity, value, base, sysid, pubid, notation_name
+    ):
+        raise EntitiesForbidden(name, value, base, sysid, pubid, notation_name)
+
+    def defused_unparsed_entity_decl(self, name, base, sysid, pubid, notation_name):
+        # expat 1.2
+        raise EntitiesForbidden(name, None, base, sysid, pubid, notation_name)  # pragma: no cover
+
+    def defused_external_entity_ref_handler(self, context, base, sysid, pubid):
+        raise ExternalReferenceForbidden(context, base, sysid, pubid)
+
+
+def monkey_patch():
+    xmlrpc_client.FastParser = DefusedExpatParser
+    xmlrpc_client.GzipDecodedResponse = DefusedGzipDecodedResponse
+    xmlrpc_client.gzip_decode = defused_gzip_decode
+    if xmlrpc_server:
+        xmlrpc_server.gzip_decode = defused_gzip_decode
+
+
+def unmonkey_patch():
+    xmlrpc_client.FastParser = None
+    xmlrpc_client.GzipDecodedResponse = _OrigGzipDecodedResponse
+    xmlrpc_client.gzip_decode = _orig_gzip_decode
+    if xmlrpc_server:
+        xmlrpc_server.gzip_decode = _orig_gzip_decode

resources/lib/deps/__init__.py

@@ -0,0 +1,4 @@
+import os
+import sys
+
+sys.path.insert(1, os.path.join(os.path.dirname(__file__)))

resources/lib/deps/simplecache.py

@@ -0,0 +1,307 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+'''provides a simple stateless caching system for Kodi addons and plugins'''
+
+import sys
+import xbmcvfs
+import xbmcgui
+import xbmc
+import xbmcaddon
+import datetime
+import time
+import sqlite3
+import json
+from functools import reduce
+
+class SimpleCache(object):
+    '''simple stateless caching system for Kodi'''
+    enable_mem_cache = True
+    data_is_json = False
+    global_checksum = None
+    _exit = False
+    _auto_clean_interval = datetime.timedelta(hours=4)
+    _win = None
+    _busy_tasks = []
+    _database = None
+
+    def __init__(self, addon_id):
+        '''Initialize our caching class'''
+        self.addon_id = addon_id
+        self._win = xbmcgui.Window(10000)
+        self._monitor = xbmc.Monitor()
+        self.check_cleanup()
+        self._log_msg("Initialized")
+
+    def close(self):
+        '''tell any tasks to stop immediately (as we can be called multithreaded) and cleanup objects'''
+        self._exit = True
+        # wait for all tasks to complete
+        while self._busy_tasks and not self._monitor.abortRequested():
+            xbmc.sleep(25)
+        del self._win
+        del self._monitor
+        self._log_msg("Closed")
+
+    def __del__(self):
+        '''make sure close is called'''
+        if not self._exit:
+            self.close()
+
+    def get(self, endpoint, checksum="", json_data=False):
+        '''
+            get object from cache and return the results
+            endpoint: the (unique) name of the cache object as reference
+            checkum: optional argument to check if the checksum in the cacheobject matches the checkum provided
+        '''
+        checksum = self._get_checksum(checksum)
+        cur_time = self._get_timestamp(datetime.datetime.now())
+        result = None
+        # 1: try memory cache first
+        if self.enable_mem_cache:
+            result = self._get_mem_cache(endpoint, checksum, cur_time, json_data)
+
+        # 2: fallback to _database cache
+        if result is None:
+            result = self._get_db_cache(endpoint, checksum, cur_time, json_data)
+
+        return result
+
+    def set(self, endpoint, data, checksum="", expiration=datetime.timedelta(days=30), json_data=False):
+        '''
+            set data in cache
+        '''
+        task_name = "set.%s" % endpoint
+        self._busy_tasks.append(task_name)
+        checksum = self._get_checksum(checksum)
+        expires = self._get_timestamp(datetime.datetime.now() + expiration)
+
+        # memory cache: write to window property
+        if self.enable_mem_cache and not self._exit:
+            self._set_mem_cache(endpoint, checksum, expires, data, json_data)
+
+        # db cache
+        if not self._exit:
+            self._set_db_cache(endpoint, checksum, expires, data, json_data)
+
+        # remove this task from list
+        self._busy_tasks.remove(task_name)
+
+    def check_cleanup(self):
+        '''check if cleanup is needed - public method, may be called by calling addon'''
+        cur_time = datetime.datetime.now()
+        lastexecuted = self._win.getProperty("simplecache.clean.lastexecuted")
+        if not lastexecuted:
+            self._win.setProperty("simplecache.clean.lastexecuted", repr(cur_time))
+        elif (eval(lastexecuted) + self._auto_clean_interval) < cur_time:
+            # cleanup needed...
+            self._do_cleanup()
+
+    def _get_mem_cache(self, endpoint, checksum, cur_time, json_data):
+        '''
+            get cache data from memory cache
+            we use window properties because we need to be stateless
+        '''
+        result = None
+        cachedata = self._win.getProperty(endpoint)
+
+        if cachedata:
+            if json_data or self.data_is_json:
+                cachedata = json.loads(cachedata)
+            else:
+                cachedata = eval(cachedata)
+            if cachedata[0] > cur_time:
+                if not checksum or checksum == cachedata[2]:
+                    result = cachedata[1]
+        return result
+
+    def _set_mem_cache(self, endpoint, checksum, expires, data, json_data):
+        '''
+            window property cache as alternative for memory cache
+            usefull for (stateless) plugins
+        '''
+        cachedata = (expires, data, checksum)
+        if json_data or self.data_is_json:
+            cachedata_str = json.dumps(cachedata)
+        else:
+            cachedata_str = repr(cachedata)
+        self._win.setProperty(endpoint, cachedata_str)
+
+
+    def _get_db_cache(self, endpoint, checksum, cur_time, json_data):
+        '''get cache data from sqllite _database'''
+        result = None
+        query = "SELECT expires, data, checksum FROM simplecache WHERE id = ?"
+        cache_data = self._execute_sql(query, (endpoint,))
+        if cache_data:
+            cache_data = cache_data.fetchone()
+            if cache_data and cache_data[0] > cur_time:
+                if not checksum or cache_data[2] == checksum:
+                    if json_data or self.data_is_json:
+                        result = json.loads(cache_data[1])
+                    else:
+                        result = eval(cache_data[1])
+                    # also set result in memory cache for further access
+                    if self.enable_mem_cache:
+                        self._set_mem_cache(endpoint, checksum, cache_data[0], result, json_data)
+        return result
+
+    def _set_db_cache(self, endpoint, checksum, expires, data, json_data):
+        ''' store cache data in _database '''
+        query = "INSERT OR REPLACE INTO simplecache( id, expires, data, checksum) VALUES (?, ?, ?, ?)"
+        if json_data or self.data_is_json:
+            data = json.dumps(data)
+        else:
+            data = repr(data)
+        self._execute_sql(query, (endpoint, expires, data, checksum))
+
+    def _do_cleanup(self):
+        '''perform cleanup task'''
+        if self._exit or self._monitor.abortRequested():
+            return
+        self._busy_tasks.append(__name__)
+        cur_time = datetime.datetime.now()
+        cur_timestamp = self._get_timestamp(cur_time)
+        self._log_msg("Running cleanup...")
+        if self._win.getProperty("simplecachecleanbusy"):
+            return
+        self._win.setProperty("simplecachecleanbusy", "busy")
+
+        query = "SELECT id, expires FROM simplecache"
+        for cache_data in self._execute_sql(query).fetchall():
+            cache_id = cache_data[0]
+            cache_expires = cache_data[1]
+
+            if self._exit or self._monitor.abortRequested():
+                return
+
+            # always cleanup all memory objects on each interval
+            self._win.clearProperty(cache_id)
+
+            # clean up db cache object only if expired
+            if cache_expires < cur_timestamp:
+                query = 'DELETE FROM simplecache WHERE id = ?'
+                self._execute_sql(query, (cache_id,))
+                self._log_msg("delete from db %s" % cache_id)
+
+        # compact db
+        self._execute_sql("VACUUM")
+
+        # remove task from list
+        self._busy_tasks.remove(__name__)
+        self._win.setProperty("simplecache.clean.lastexecuted", repr(cur_time))
+        self._win.clearProperty("simplecachecleanbusy")
+        self._log_msg("Auto cleanup done")
+
+    def _get_database(self):
+        '''get reference to our sqllite _database - performs basic integrity check'''
+        addon = xbmcaddon.Addon(self.addon_id)
+        dbpath = addon.getAddonInfo('profile')
+        dbfile = xbmcvfs.translatePath("%s/simplecache.db" % dbpath)
+
+        if not xbmcvfs.exists(dbpath):
+            xbmcvfs.mkdirs(dbpath)
+        del addon
+        try:
+            connection = sqlite3.connect(dbfile, timeout=30, isolation_level=None)
+            connection.execute('SELECT * FROM simplecache LIMIT 1')
+            return connection
+        except Exception as error:
+            # our _database is corrupt or doesn't exist yet, we simply try to recreate it
+            if xbmcvfs.exists(dbfile):
+                xbmcvfs.delete(dbfile)
+            try:
+                connection = sqlite3.connect(dbfile, timeout=30, isolation_level=None)
+                connection.execute(
+                    """CREATE TABLE IF NOT EXISTS simplecache(
+                    id TEXT UNIQUE, expires INTEGER, data TEXT, checksum INTEGER)""")
+                return connection
+            except Exception as error:
+                self._log_msg("Exception while initializing _database: %s" % str(error), xbmc.LOGWARNING)
+                self.close()
+                return None
+
+    def _execute_sql(self, query, data=None):
+        '''little wrapper around execute and executemany to just retry a db command if db is locked'''
+        retries = 0
+        result = None
+        error = None
+        # always use new db object because we need to be sure that data is available for other simplecache instances
+        with self._get_database() as _database:
+            while not retries == 10 and not self._monitor.abortRequested():
+                if self._exit:
+                    return None
+                try:
+                    if isinstance(data, list):
+                        result = _database.executemany(query, data)
+                    elif data:
+                        result = _database.execute(query, data)
+                    else:
+                        result = _database.execute(query)
+                    return result
+                except sqlite3.OperationalError as error:
+                    if "_database is locked" in error:
+                        self._log_msg("retrying DB commit...")
+                        retries += 1
+                        self._monitor.waitForAbort(0.5)
+                    else:
+                        break
+                except Exception as error:
+                    break
+            self._log_msg("_database ERROR ! -- %s" % str(error), xbmc.LOGWARNING)
+        return None
+
+    @staticmethod
+    def _log_msg(msg, loglevel=xbmc.LOGDEBUG):
+        '''helper to send a message to the kodi log'''
+        xbmc.log("Skin Helper Simplecache --> %s" % msg, level=loglevel)
+
+    @staticmethod
+    def _get_timestamp(date_time):
+        '''Converts a datetime object to unix timestamp'''
+        return int(time.mktime(date_time.timetuple()))
+
+    def _get_checksum(self, stringinput):
+        '''get int checksum from string'''
+        if not stringinput and not self.global_checksum:
+            return 0
+        if self.global_checksum:
+            stringinput = "%s-%s" %(self.global_checksum, stringinput)
+        else:
+            stringinput = str(stringinput)
+        return reduce(lambda x, y: x + y, map(ord, stringinput))
+
+
+def use_cache(cache_days=14):
+    '''
+        wrapper around our simple cache to use as decorator
+        Usage: define an instance of SimpleCache with name "cache" (self.cache) in your class
+        Any method that needs caching just add @use_cache as decorator
+        NOTE: use unnamed arguments for calling the method and named arguments for optional settings
+    '''
+    def decorator(func):
+        '''our decorator'''
+        def decorated(*args, **kwargs):
+            '''process the original method and apply caching of the results'''
+            method_class = args[0]
+            method_class_name = method_class.__class__.__name__
+            cache_str = "%s.%s" % (method_class_name, func.__name__)
+            # cache identifier is based on positional args only
+            # named args are considered optional and ignored
+            for item in args[1:]:
+                cache_str += u".%s" % item
+            cache_str = cache_str.lower()
+            cachedata = method_class.cache.get(cache_str)
+            global_cache_ignore = False
+            try:
+                global_cache_ignore = method_class.ignore_cache
+            except Exception:
+                pass
+            if cachedata is not None and not kwargs.get("ignore_cache", False) and not global_cache_ignore:
+                return cachedata
+            else:
+                result = func(*args, **kwargs)
+                method_class.cache.set(cache_str, result, expiration=datetime.timedelta(days=cache_days))
+                return result
+        return decorated
+    return decorator

resources/lib/deps/spotipy/__init__.py

@@ -0,0 +1,5 @@
+from .cache_handler import *  # noqa
+from .client import *  # noqa
+from .exceptions import *  # noqa
+from .oauth2 import *  # noqa
+from .util import *  # noqa

resources/lib/deps/spotipy/cache_handler.py

@@ -0,0 +1,173 @@
+__all__ = [
+    'CacheHandler',
+    'CacheFileHandler',
+    'DjangoSessionCacheHandler',
+    'FlaskSessionCacheHandler',
+    'MemoryCacheHandler']
+
+import errno
+import json
+import logging
+import os
+from spotipy.util import CLIENT_CREDS_ENV_VARS
+
+logger = logging.getLogger(__name__)
+
+
+class CacheHandler():
+    """
+    An abstraction layer for handling the caching and retrieval of
+    authorization tokens.
+
+    Custom extensions of this class must implement get_cached_token
+    and save_token_to_cache methods with the same input and output
+    structure as the CacheHandler class.
+    """
+
+    def get_cached_token(self):
+        """
+        Get and return a token_info dictionary object.
+        """
+        # return token_info
+        raise NotImplementedError()
+
+    def save_token_to_cache(self, token_info):
+        """
+        Save a token_info dictionary object to the cache and return None.
+        """
+        raise NotImplementedError()
+        return None
+
+
+class CacheFileHandler(CacheHandler):
+    """
+    Handles reading and writing cached Spotify authorization tokens
+    as json files on disk.
+    """
+
+    def __init__(self,
+                 cache_path=None,
+                 username=None,
+                 encoder_cls=None):
+        """
+        Parameters:
+             * cache_path: May be supplied, will otherwise be generated
+                           (takes precedence over `username`)
+             * username: May be supplied or set as environment variable
+                         (will set `cache_path` to `.cache-{username}`)
+             * encoder_cls: May be supplied as a means of overwriting the
+                        default serializer used for writing tokens to disk
+        """
+        self.encoder_cls = encoder_cls
+        if cache_path:
+            self.cache_path = cache_path
+        else:
+            cache_path = ".cache"
+            username = (username or os.getenv(CLIENT_CREDS_ENV_VARS["client_username"]))
+            if username:
+                cache_path += "-" + str(username)
+            self.cache_path = cache_path
+
+    def get_cached_token(self):
+        token_info = None
+
+        try:
+            f = open(self.cache_path)
+            token_info_string = f.read()
+            f.close()
+            token_info = json.loads(token_info_string)
+
+        except IOError as error:
+            if error.errno == errno.ENOENT:
+                logger.debug("cache does not exist at: %s", self.cache_path)
+            else:
+                logger.warning("Couldn't read cache at: %s", self.cache_path)
+
+        return token_info
+
+    def save_token_to_cache(self, token_info):
+        try:
+            f = open(self.cache_path, "w")
+            f.write(json.dumps(token_info, cls=self.encoder_cls))
+            f.close()
+        except IOError:
+            logger.warning('Couldn\'t write token to cache at: %s',
+                           self.cache_path)
+
+
+class MemoryCacheHandler(CacheHandler):
+    """
+    A cache handler that simply stores the token info in memory as an
+    instance attribute of this class. The token info will be lost when this
+    instance is freed.
+    """
+
+    def __init__(self, token_info=None):
+        """
+        Parameters:
+            * token_info: The token info to store in memory. Can be None.
+        """
+        self.token_info = token_info
+
+    def get_cached_token(self):
+        return self.token_info
+
+    def save_token_to_cache(self, token_info):
+        self.token_info = token_info
+
+
+class DjangoSessionCacheHandler(CacheHandler):
+    """
+    A cache handler that stores the token info in the session framework
+    provided by Django.
+
+    Read more at https://docs.djangoproject.com/en/3.2/topics/http/sessions/
+    """
+
+    def __init__(self, request):
+        """
+        Parameters:
+            * request: HttpRequest object provided by Django for every
+            incoming request
+        """
+        self.request = request
+
+    def get_cached_token(self):
+        token_info = None
+        try:
+            token_info = self.request.session['token_info']
+        except KeyError:
+            logger.debug("Token not found in the session")
+
+        return token_info
+
+    def save_token_to_cache(self, token_info):
+        try:
+            self.request.session['token_info'] = token_info
+        except Exception as e:
+            logger.warning("Error saving token to cache: " + str(e))
+
+
+class FlaskSessionCacheHandler(CacheHandler):
+    """
+    A cache handler that stores the token info in the session framework
+    provided by flask.
+    """
+
+    def __init__(self, session):
+        self.session = session
+
+    def get_cached_token(self):
+        token_info = None
+        try:
+            token_info = self.session["token_info"]
+        except KeyError:
+            logger.debug("Token not found in the session")
+
+        return token_info
+
+    def save_token_to_cache(self, token_info):
+        try:
+            self.session["token_info"] = token_info
+        except Exception as e:
+            logger.warning("Error saving token to cache: " + str(e))

resources/lib/deps/spotipy/exceptions.py

@@ -0,0 +1,16 @@
+class SpotifyException(Exception):
+
+    def __init__(self, http_status, code, msg, reason=None, headers=None):
+        self.http_status = http_status
+        self.code = code
+        self.msg = msg
+        self.reason = reason
+        # `headers` is used to support `Retry-After` in the event of a
+        # 429 status code.
+        if headers is None:
+            headers = {}
+        self.headers = headers
+
+    def __str__(self):
+        return 'http status: {0}, code:{1} - {2}, reason: {3}'.format(
+            self.http_status, self.code, self.msg, self.reason)

resources/lib/deps/spotipy/util.py

@@ -0,0 +1,135 @@
+# -*- coding: utf-8 -*-
+
+""" Shows a user's playlists (need to be authenticated via oauth) """
+
+__all__ = ["CLIENT_CREDS_ENV_VARS", "prompt_for_user_token"]
+
+import logging
+import os
+import warnings
+
+import spotipy
+
+LOGGER = logging.getLogger(__name__)
+
+CLIENT_CREDS_ENV_VARS = {
+    "client_id": "SPOTIPY_CLIENT_ID",
+    "client_secret": "SPOTIPY_CLIENT_SECRET",
+    "client_username": "SPOTIPY_CLIENT_USERNAME",
+    "redirect_uri": "SPOTIPY_REDIRECT_URI",
+}
+
+
+def prompt_for_user_token(
+    username=None,
+    scope=None,
+    client_id=None,
+    client_secret=None,
+    redirect_uri=None,
+    cache_path=None,
+    oauth_manager=None,
+    show_dialog=False
+):
+    warnings.warn(
+        "'prompt_for_user_token' is deprecated."
+        "Use the following instead: "
+        "    auth_manager=SpotifyOAuth(scope=scope)"
+        "    spotipy.Spotify(auth_manager=auth_manager)",
+        DeprecationWarning
+    )
+    """ prompts the user to login if necessary and returns
+        the user token suitable for use with the spotipy.Spotify
+        constructor
+
+        Parameters:
+
+         - username - the Spotify username (optional)
+         - scope - the desired scope of the request (optional)
+         - client_id - the client id of your app (required)
+         - client_secret - the client secret of your app (required)
+         - redirect_uri - the redirect URI of your app (required)
+         - cache_path - path to location to save tokens (optional)
+         - oauth_manager - Oauth manager object (optional)
+         - show_dialog - If true, a login prompt always shows (optional, defaults to False)
+
+    """
+    if not oauth_manager:
+        if not client_id:
+            client_id = os.getenv("SPOTIPY_CLIENT_ID")
+
+        if not client_secret:
+            client_secret = os.getenv("SPOTIPY_CLIENT_SECRET")
+
+        if not redirect_uri:
+            redirect_uri = os.getenv("SPOTIPY_REDIRECT_URI")
+
+        if not client_id:
+            LOGGER.warning(
+                """
+                You need to set your Spotify API credentials.
+                You can do this by setting environment variables like so:
+
+                export SPOTIPY_CLIENT_ID='your-spotify-client-id'
+                export SPOTIPY_CLIENT_SECRET='your-spotify-client-secret'
+                export SPOTIPY_REDIRECT_URI='your-app-redirect-url'
+
+                Get your credentials at
+                    https://developer.spotify.com/my-applications
+            """
+            )
+            raise spotipy.SpotifyException(550, -1, "no credentials set")
+
+    sp_oauth = oauth_manager or spotipy.SpotifyOAuth(
+        client_id,
+        client_secret,
+        redirect_uri,
+        scope=scope,
+        cache_path=cache_path,
+        username=username,
+        show_dialog=show_dialog
+    )
+
+    # try to get a valid token for this user, from the cache,
+    # if not in the cache, then create a new (this will send
+    # the user to a web page where they can authorize this app)
+
+    token_info = sp_oauth.validate_token(sp_oauth.cache_handler.get_cached_token())
+
+    if not token_info:
+        code = sp_oauth.get_auth_response()
+        token = sp_oauth.get_access_token(code, as_dict=False)
+    else:
+        return token_info["access_token"]
+
+    # Auth'ed API request
+    if token:
+        return token
+    else:
+        return None
+
+
+def get_host_port(netloc):
+    if ":" in netloc:
+        host, port = netloc.split(":", 1)
+        port = int(port)
+    else:
+        host = netloc
+        port = None
+
+    return host, port
+
+
+def normalize_scope(scope):
+    if scope:
+        if isinstance(scope, str):
+            scopes = scope.split(',')
+        elif isinstance(scope, list) or isinstance(scope, tuple):
+            scopes = scope
+        else:
+            raise Exception(
+                "Unsupported scope value, please either provide a list of scopes, "
+                "or a string of scopes separated by commas"
+            )
+        return " ".join(sorted(scopes))
+    else:
+        return None

resources/lib/http_video_player_setter.py

@@ -0,0 +1,84 @@
+import os
+from xml.etree import ElementTree
+
+import xbmcvfs
+from xbmc import LOGDEBUG
+
+from utils import ADDON_ID, log_msg
+
+
+class HttpVideoPlayerSetter:
+    def __init__(self):
+        self.__plugin_name = ADDON_ID
+        self.__player_rules_filename = xbmcvfs.translatePath(
+            f"special://masterprofile/playercorefactory.xml"
+        )
+
+    def set_http_rule(self) -> bool:
+        if not os.path.exists(self.__player_rules_filename):
+            self.__create_new_player_rules()
+            log_msg(f"Created a new file '{self.__player_rules_filename}' with a video http rule.")
+            return True
+        else:
+            if self.__add_http_rule():
+                log_msg(f"Added a video http rule to '{self.__player_rules_filename}'")
+                return True
+
+            log_msg(
+                f"There is already a video http rule in '{self.__player_rules_filename}'."
+                " Nothing to do.",
+                LOGDEBUG,
+            )
+            return False
+
+    def __create_new_player_rules(self) -> None:
+        xml_str = f"""<?xml version='1.0' encoding='utf-8'?>
+<playercorefactory>
+  <!-- This file created by the '{self.__plugin_name}' addon. -->     
+  <rules name="system rules">
+    <rule name="http" protocols="http" player="VideoPlayer" />
+  </rules>
+</playercorefactory>
+"""
+        with open(self.__player_rules_filename, "w") as f:
+            f.write(xml_str)
+
+    def __add_http_rule(self) -> bool:
+        class CommentedTreeBuilder(ElementTree.TreeBuilder):
+            def comment(self, data):
+                self.start(ElementTree.Comment().tag, {})
+                self.data(data)
+                self.end(ElementTree.Comment().tag)
+
+        parser = ElementTree.XMLParser(target=CommentedTreeBuilder())
+        tree = ElementTree.parse(self.__player_rules_filename, parser=parser)
+        root = tree.getroot()
+
+        http_rule = root.findall("./rules/rule/[@protocols='http']")
+        if http_rule:
+            return False
+
+        rules = root.find("./rules")
+
+        attributes = {
+            "name": "http",
+            "protocols": "http",
+            "player": "VideoPlayer",
+        }
+        new_rule = ElementTree.Element("rule", attributes)
+        new_rule.tail = "\n\n" + "    "
+        rules.insert(0, new_rule)
+
+        comment = ElementTree.Comment(
+            f" This http rule added by the '{self.__plugin_name}' addon. "
+        )
+        comment.tail = "\n" + "    "
+        rules.insert(0, comment)
+
+        xml_str = ElementTree.tostring(root, encoding="unicode", xml_declaration=True)
+
+        with open(self.__player_rules_filename, "w") as f:
+            f.write(xml_str)
+            f.write("\n")
+
+        return True

resources/lib/librespot/__init__.py

@@ -0,0 +1,34 @@
+from __future__ import annotations
+from librespot.crypto import DiffieHellman
+from librespot.proto.Keyexchange_pb2 import BuildInfo, Platform, Product, ProductFlags
+from librespot.structure import Closeable, Runnable
+import platform
+
+
+class Version:
+    version_name = "0.0.9"
+
+    @staticmethod
+    def platform() -> Platform:
+        if platform.system() == "Windows":
+            return Platform.PLATFORM_WIN32_X86
+        if platform.system() == "Darwin":
+            return Platform.PLATFORM_OSX_X86
+        return Platform.PLATFORM_LINUX_X86
+
+    @staticmethod
+    def version_string():
+        return "librespot-python " + Version.version_name
+
+    @staticmethod
+    def system_info_string():
+        return Version.version_string() + \
+               "; Python " + platform.python_version() + \
+               "; " + platform.system()
+
+    @staticmethod
+    def standard_build_info() -> BuildInfo:
+        return BuildInfo(product=Product.PRODUCT_CLIENT,
+                         product_flags=[ProductFlags.PRODUCT_FLAG_NONE],
+                         platform=Version.platform(),
+                         version=117300517)

resources/lib/librespot/audio/__init__.py

@@ -0,0 +1,912 @@
+from __future__ import annotations
+from librespot import util
+from librespot.audio.decrypt import AesAudioDecrypt
+from librespot.audio.format import SuperAudioFormat
+from librespot.audio.storage import ChannelManager
+from librespot.cache import CacheManager
+from librespot.crypto import Packet
+from librespot.metadata import EpisodeId, PlayableId, TrackId
+from librespot.proto import Metadata_pb2 as Metadata, StorageResolve_pb2 as StorageResolve
+from librespot.structure import AudioDecrypt, AudioQualityPicker, Closeable, FeederException, GeneralAudioStream, GeneralWritableStream, HaltListener, NoopAudioDecrypt, PacketsReceiver
+import concurrent.futures
+import io
+import logging
+import math
+import queue
+import random
+import struct
+import threading
+import time
+import typing
+import urllib.parse
+
+if typing.TYPE_CHECKING:
+    from librespot.core import Session
+
+
+class AbsChunkedInputStream(io.BytesIO, HaltListener):
+    chunk_exception = None
+    closed = False
+    max_chunk_tries = 128
+    preload_ahead = 3
+    preload_chunk_retries = 2
+    retries: typing.List[int]
+    retry_on_chunk_error: bool
+    wait_lock: threading.Condition = threading.Condition()
+    wait_for_chunk = -1
+    __decoded_length = 0
+    __mark = 0
+    __pos = 0
+
+    def __init__(self, retry_on_chunk_error: bool):
+        super().__init__()
+        self.retries = [0] * self.chunks()
+        self.retry_on_chunk_error = retry_on_chunk_error
+
+    def is_closed(self) -> bool:
+        return self.closed
+
+    def buffer(self) -> typing.List[bytes]:
+        raise NotImplementedError()
+
+    def size(self) -> int:
+        raise NotImplementedError()
+
+    def close(self) -> None:
+        self.closed = True
+        with self.wait_lock:
+            self.wait_lock.notify_all()
+
+    def available(self):
+        return self.size() - self.__pos
+
+    def mark_supported(self) -> bool:
+        return True
+
+    def mark(self, read_ahead_limit: int) -> None:
+        self.__mark = self.__pos
+
+    def reset(self) -> None:
+        self.__pos = self.__mark
+
+    def pos(self) -> int:
+        return self.__pos
+
+    def seek(self, where: int, **kwargs) -> None:
+        if where < 0:
+            raise TypeError()
+        if self.closed:
+            raise IOError("Stream is closed!")
+        self.__pos = where
+        self.check_availability(int(self.__pos / (128 * 1024)), False, False)
+
+    def skip(self, n: int) -> int:
+        if n < 0:
+            raise TypeError()
+        if self.closed:
+            raise IOError("Stream is closed!")
+        k = self.size() - self.__pos
+        if n < k:
+            k = n
+        self.__pos += k
+        chunk = int(self.__pos / (128 * 1024))
+        self.check_availability(chunk, False, False)
+        return k
+
+    def requested_chunks(self) -> typing.List[bool]:
+        raise NotImplementedError()
+
+    def available_chunks(self) -> typing.List[bool]:
+        raise NotImplementedError()
+
+    def chunks(self) -> int:
+        raise NotImplementedError()
+
+    def request_chunk_from_stream(self, index: int) -> None:
+        raise NotImplementedError()
+
+    def should_retry(self, chunk: int) -> bool:
+        if self.retries[chunk] < 1:
+            return True
+        if self.retries[chunk] > self.max_chunk_tries:
+            return False
+        return self.retry_on_chunk_error
+
+    def check_availability(self, chunk: int, wait: bool, halted: bool) -> None:
+        if halted and not wait:
+            raise TypeError()
+        if not self.requested_chunks()[chunk]:
+            self.request_chunk_from_stream(chunk)
+            self.requested_chunks()[chunk] = True
+        for i in range(chunk + 1,
+                       min(self.chunks() - 1, chunk + self.preload_ahead) + 1):
+            if (self.requested_chunks()[i]
+                    and self.retries[i] < self.preload_chunk_retries):
+                self.request_chunk_from_stream(i)
+                self.requested_chunks()[chunk] = True
+        if wait:
+            if self.available_chunks()[chunk]:
+                return
+            retry = False
+            with self.wait_lock:
+                if not halted:
+                    self.stream_read_halted(chunk, int(time.time() * 1000))
+                self.chunk_exception = None
+                self.wait_for_chunk = chunk
+                self.wait_lock.wait_for(lambda: self.available_chunks()[chunk])
+                if self.closed:
+                    return
+                if self.chunk_exception is not None:
+                    if self.should_retry(chunk):
+                        retry = True
+                    else:
+                        raise AbsChunkedInputStream.ChunkException
+                if not retry:
+                    self.stream_read_halted(chunk, int(time.time() * 1000))
+            if retry:
+                time.sleep(math.log10(self.retries[chunk]))
+                self.check_availability(chunk, True, True)
+
+    def read(self, __size: int = 0) -> bytes:
+        if self.closed:
+            raise IOError("Stream is closed!")
+        if __size <= 0:
+            if self.__pos == self.size():
+                return b""
+            buffer = io.BytesIO()
+            total_size = self.size()
+            chunk = int(self.__pos / (128 * 1024))
+            chunk_off = int(self.__pos % (128 * 1024))
+            chunk_total = int(math.ceil(total_size / (128 * 1024)))
+            self.check_availability(chunk, True, False)
+            buffer.write(self.buffer()[chunk][chunk_off:])
+            chunk += 1
+            if chunk != chunk_total:
+                while chunk <= chunk_total - 1:
+                    self.check_availability(chunk, True, False)
+                    buffer.write(self.buffer()[chunk])
+                    chunk += 1
+            buffer.seek(0)
+            self.__pos += buffer.getbuffer().nbytes
+            return buffer.read()
+        buffer = io.BytesIO()
+        chunk = int(self.__pos / (128 * 1024))
+        chunk_off = int(self.__pos % (128 * 1024))
+        chunk_end = int(__size / (128 * 1024))
+        chunk_end_off = int(__size % (128 * 1024))
+        if chunk_end > self.size():
+            chunk_end = int(self.size() / (128 * 1024))
+            chunk_end_off = int(self.size() % (128 * 1024))
+        self.check_availability(chunk, True, False)
+        if chunk_off + __size > len(self.buffer()[chunk]):
+            buffer.write(self.buffer()[chunk][chunk_off:])
+            chunk += 1
+            while chunk <= chunk_end:
+                self.check_availability(chunk, True, False)
+                if chunk == chunk_end:
+                    buffer.write(self.buffer()[chunk][:chunk_end_off])
+                else:
+                    buffer.write(self.buffer()[chunk])
+                chunk += 1
+        else:
+            buffer.write(self.buffer()[chunk][chunk_off:chunk_off + __size])
+        buffer.seek(0)
+        self.__pos += buffer.getbuffer().nbytes
+        return buffer.read()
+
+    def notify_chunk_available(self, index: int) -> None:
+        self.available_chunks()[index] = True
+        self.__decoded_length += len(self.buffer()[index])
+        with self.wait_lock:
+            if index == self.wait_for_chunk and not self.closed:
+                self.wait_for_chunk = -1
+                self.wait_lock.notify_all()
+
+    def notify_chunk_error(self, index: int, ex):
+        self.available_chunks()[index] = False
+        self.requested_chunks()[index] = False
+        self.retries[index] += 1
+        with self.wait_lock:
+            if index == self.wait_for_chunk and not self.closed:
+                self.chunk_exception = ex
+                self.wait_for_chunk = -1
+                self.wait_lock.notify_all()
+
+    def decoded_length(self):
+        return self.__decoded_length
+
+    class ChunkException(IOError):
+
+        @staticmethod
+        def from_stream_error(stream_error: int):
+            return AbsChunkedInputStream \
+                .ChunkException("Failed due to stream error, code: {}".format(stream_error))
+
+
+class AudioKeyManager(PacketsReceiver, Closeable):
+    audio_key_request_timeout = 20
+    logger = logging.getLogger("Librespot:AudioKeyManager")
+    __callbacks: typing.Dict[int, Callback] = {}
+    __seq_holder = 0
+    __seq_holder_lock = threading.Condition()
+    __session: Session
+    __zero_short = b"\x00\x00"
+
+    def __init__(self, session: Session):
+        self.__session = session
+
+    def dispatch(self, packet: Packet) -> None:
+        payload = io.BytesIO(packet.payload)
+        seq = struct.unpack(">i", payload.read(4))[0]
+        callback = self.__callbacks.get(seq)
+        if callback is None:
+            self.logger.warning(
+                "Couldn't find callback for seq: {}".format(seq))
+            return
+        if packet.is_cmd(Packet.Type.aes_key):
+            key = payload.read(16)
+            callback.key(key)
+        elif packet.is_cmd(Packet.Type.aes_key_error):
+            code = struct.unpack(">H", payload.read(2))[0]
+            callback.error(code)
+        else:
+            self.logger.warning(
+                "Couldn't handle packet, cmd: {}, length: {}".format(
+                    packet.cmd, len(packet.payload)))
+
+    def get_audio_key(self,
+                      gid: bytes,
+                      file_id: bytes,
+                      retry: bool = True) -> bytes:
+        seq: int
+        with self.__seq_holder_lock:
+            seq = self.__seq_holder
+            self.__seq_holder += 1
+        out = io.BytesIO()
+        out.write(file_id)
+        out.write(gid)
+        out.write(struct.pack(">i", seq))
+        out.write(self.__zero_short)
+        out.seek(0)
+        self.__session.send(Packet.Type.request_key, out.read())
+        callback = AudioKeyManager.SyncCallback(self)
+        self.__callbacks[seq] = callback
+        key = callback.wait_response()
+        if key is None:
+            if retry:
+                return self.get_audio_key(gid, file_id, False)
+            raise RuntimeError(
+                "Failed fetching audio key! gid: {}, fileId: {}".format(
+                    util.bytes_to_hex(gid), util.bytes_to_hex(file_id)))
+        return key
+
+    class Callback:
+
+        def key(self, key: bytes) -> None:
+            raise NotImplementedError
+
+        def error(self, code: int) -> None:
+            raise NotImplementedError
+
+    class SyncCallback(Callback):
+        __audio_key_manager: AudioKeyManager
+        __reference = queue.Queue()
+        __reference_lock = threading.Condition()
+
+        def __init__(self, audio_key_manager: AudioKeyManager):
+            self.__audio_key_manager = audio_key_manager
+
+        def key(self, key: bytes) -> None:
+            with self.__reference_lock:
+                self.__reference.put(key)
+                self.__reference_lock.notify_all()
+
+        def error(self, code: int) -> None:
+            self.__audio_key_manager.logger.fatal(
+                "Audio key error, code: {}".format(code))
+            with self.__reference_lock:
+                self.__reference.put(None)
+                self.__reference_lock.notify_all()
+
+        def wait_response(self) -> bytes:
+            with self.__reference_lock:
+                self.__reference_lock.wait(
+                    AudioKeyManager.audio_key_request_timeout)
+                return self.__reference.get(block=False)
+
+
+class CdnFeedHelper:
+    _LOGGER: logging = logging.getLogger(__name__)
+
+    @staticmethod
+    def get_url(resp: StorageResolve.StorageResolveResponse) -> str:
+        selected_url = random.choice(resp.cdnurl)
+        while "audio4-gm-fb" in selected_url or "audio-gm-fb" in selected_url:
+            selected_url = random.choice(resp.cdnurl)
+        return selected_url
+
+    @staticmethod
+    def load_track(
+            session: Session, track: Metadata.Track, file: Metadata.AudioFile,
+            resp_or_url: typing.Union[StorageResolve.StorageResolveResponse,
+                                      str], preload: bool,
+            halt_listener: HaltListener) -> PlayableContentFeeder.LoadedStream:
+        if type(resp_or_url) is str:
+            url = resp_or_url
+        else:
+            url = CdnFeedHelper.get_url(resp_or_url)
+        start = int(time.time() * 1000)
+        key = session.audio_key().get_audio_key(track.gid, file.file_id)
+        audio_key_time = int(time.time() * 1000) - start
+
+        streamer = session.cdn().stream_file(file, key, url, halt_listener)
+        input_stream = streamer.stream()
+        normalization_data = NormalizationData.read(input_stream)
+        if input_stream.skip(0xA7) != 0xA7:
+            raise IOError("Couldn't skip 0xa7 bytes!")
+        return PlayableContentFeeder.LoadedStream(
+            track,
+            streamer,
+            normalization_data,
+            PlayableContentFeeder.Metrics(file.file_id, preload,
+                                          -1 if preload else audio_key_time),
+        )
+
+    @staticmethod
+    def load_episode_external(
+            session: Session, episode: Metadata.Episode,
+            halt_listener: HaltListener) -> PlayableContentFeeder.LoadedStream:
+        resp = session.client().head(episode.external_url)
+
+        if resp.status_code != 200:
+            CdnFeedHelper._LOGGER.warning("Couldn't resolve redirect!")
+
+        url = resp.url
+        CdnFeedHelper._LOGGER.debug("Fetched external url for {}: {}".format(
+            util.bytes_to_hex(episode.gid), url))
+
+        streamer = session.cdn().stream_external_episode(
+            episode, url, halt_listener)
+        return PlayableContentFeeder.LoadedStream(
+            episode,
+            streamer,
+            None,
+            PlayableContentFeeder.Metrics(None, False, -1),
+        )
+
+    @staticmethod
+    def load_episode(
+        session: Session,
+        episode: Metadata.Episode,
+        file: Metadata.AudioFile,
+        resp_or_url: typing.Union[StorageResolve.StorageResolveResponse, str],
+        preload: bool,
+        halt_listener: HaltListener,
+    ) -> PlayableContentFeeder.LoadedStream:
+        if type(resp_or_url) is str:
+            url = resp_or_url
+        else:
+            url = CdnFeedHelper.get_url(resp_or_url)
+        start = int(time.time() * 1000)
+        key = session.audio_key().get_audio_key(episode.gid, file.file_id)
+        audio_key_time = int(time.time() * 1000) - start
+
+        streamer = session.cdn().stream_file(file, key, url, halt_listener)
+        input_stream = streamer.stream()
+        normalization_data = NormalizationData.read(input_stream)
+        if input_stream.skip(0xA7) != 0xA7:
+            raise IOError("Couldn't skip 0xa7 bytes!")
+        return PlayableContentFeeder.LoadedStream(
+            episode,
+            streamer,
+            normalization_data,
+            PlayableContentFeeder.Metrics(file.file_id, preload,
+                                          -1 if preload else audio_key_time),
+        )
+
+
+class CdnManager:
+    logger: logging = logging.getLogger("Librespot:CdnManager")
+    __session: Session
+
+    def __init__(self, session: Session):
+        self.__session = session
+
+    def get_head(self, file_id: bytes):
+        response = self.__session.client() \
+            .get(self.__session.get_user_attribute("head-files-url", "https://heads-fa.spotify.com/head/{file_id}")
+                 .replace("{file_id}", util.bytes_to_hex(file_id)))
+        if response.status_code != 200:
+            raise IOError("{}".format(response.status_code))
+        body = response.content
+        if body is None:
+            raise IOError("Response body is empty!")
+        return body
+
+    def stream_external_episode(self, episode: Metadata.Episode,
+                                external_url: str,
+                                halt_listener: HaltListener):
+        return CdnManager.Streamer(
+            self.__session,
+            StreamId(episode=episode),
+            SuperAudioFormat.MP3,
+            CdnManager.CdnUrl(self, None, external_url),
+            self.__session.cache(),
+            NoopAudioDecrypt(),
+            halt_listener,
+        )
+
+    def stream_file(self, file: Metadata.AudioFile, key: bytes, url: str,
+                    halt_listener: HaltListener):
+        return CdnManager.Streamer(
+            self.__session,
+            StreamId(file=file),
+            SuperAudioFormat.get(file.format),
+            CdnManager.CdnUrl(self, file.file_id, url),
+            self.__session.cache(),
+            AesAudioDecrypt(key),
+            halt_listener,
+        )
+
+    def get_audio_url(self, file_id: bytes):
+        response = self.__session.api()\
+            .send("GET", "/storage-resolve/files/audio/interactive/{}".format(util.bytes_to_hex(file_id)), None, None)
+        if response.status_code != 200:
+            raise IOError(response.status_code)
+        body = response.content
+        if body is None:
+            raise IOError("Response body is empty!")
+        proto = StorageResolve.StorageResolveResponse()
+        proto.ParseFromString(body)
+        if proto.result == StorageResolve.StorageResolveResponse.Result.CDN:
+            url = random.choice(proto.cdnurl)
+            self.logger.debug("Fetched CDN url for {}: {}".format(
+                util.bytes_to_hex(file_id), url))
+            return url
+        raise CdnManager.CdnException(
+            "Could not retrieve CDN url! result: {}".format(proto.result))
+
+    class CdnException(Exception):
+        pass
+
+    class InternalResponse:
+        buffer: bytes
+        headers: typing.Dict[str, str]
+
+        def __init__(self, buffer: bytes, headers: typing.Dict[str, str]):
+            self.buffer = buffer
+            self.headers = headers
+
+    class CdnUrl:
+        __cdn_manager = None
+        __file_id: bytes
+        __expiration: int
+        url: str
+
+        def __init__(self, cdn_manager, file_id: typing.Union[bytes, None],
+                     url: str):
+            self.__cdn_manager: CdnManager = cdn_manager
+            self.__file_id = file_id
+            self.set_url(url)
+
+        def url(self):
+            if self.__expiration == -1:
+                return self.url
+            if self.__expiration <= int(time.time() * 1000) + 5 * 60 * 1000:
+                self.url = self.__cdn_manager.get_audio_url(self.__file_id)
+            return self.url
+
+        def set_url(self, url: str):
+            self.url = url
+            if self.__file_id is not None:
+                token_url = urllib.parse.urlparse(url)
+                token_query = urllib.parse.parse_qs(token_url.query)
+                token_list = token_query.get("__token__")
+                try:
+                    token_str = str(token_list[0])
+                except TypeError:
+                    token_str = ""
+                expires_list = token_query.get("Expires")
+                try:
+                    expires_str = str(expires_list[0])
+                except TypeError:
+                    expires_str = ""
+                if token_str != "None" and len(token_str) != 0:
+                    expire_at = None
+                    split = token_str.split("~")
+                    for s in split:
+                        try:
+                            i = s.index("=")
+                        except ValueError:
+                            continue
+                        if s[:i] == "exp":
+                            expire_at = int(s[i + 1:])
+                            break
+                    if expire_at is None:
+                        self.__expiration = -1
+                        self.__cdn_manager.logger.warning(
+                            "Invalid __token__ in CDN url: {}".format(url))
+                        return
+                    self.__expiration = expire_at * 1000
+                elif expires_str != "None" and len(expires_str) != 0:
+                    expires_at = None
+                    expires_str = expires_str.split("~")[0]
+                    expires_at = int(expires_str)
+                    if expires_at is None:
+                        self.__expiration = -1
+                        self.__cdn_manager.logger.warning("Invalid Expires param in CDN url: {}".format(url))
+                        return
+                    self.__expiration = expires_at * 1000
+                else:
+                    try:
+                        i = token_url.query.index("_")
+                    except ValueError:
+                        self.__expiration = -1
+                        self.__cdn_manager.logger \
+                            .warning("Couldn't extract expiration, invalid parameter in CDN url: {}".format(url))
+                        return
+                    self.__expiration = int(token_url.query[:i]) * 1000
+
+            else:
+                self.__expiration = -1
+
+    class Streamer(GeneralAudioStream, GeneralWritableStream):
+        available: typing.List[bool]
+        buffer: typing.List[bytes]
+        chunks: int
+        executor_service = concurrent.futures.ThreadPoolExecutor()
+        halt_listener: HaltListener
+        requested: typing.List[bool]
+        size: int
+        __audio_format: SuperAudioFormat
+        __audio_decrypt: AudioDecrypt
+        __cdn_url: CdnManager.CdnUrl
+        __internal_stream: InternalStream
+        __session: Session
+        __stream_id: StreamId
+
+        def __init__(self, session: Session, stream_id: StreamId,
+                     audio_format: SuperAudioFormat,
+                     cdn_url: CdnManager.CdnUrl, cache: CacheManager,
+                     audio_decrypt: AudioDecrypt, halt_listener: HaltListener):
+            self.__session = session
+            self.__stream_id = stream_id
+            self.__audio_format = audio_format
+            self.__audio_decrypt = audio_decrypt
+            self.__cdn_url = cdn_url
+            self.halt_listener = halt_listener
+            response = self.request(range_start=0,
+                                    range_end=ChannelManager.chunk_size - 1)
+            content_range = response.headers.get("Content-Range")
+            if content_range is None:
+                raise IOError("Missing Content-Range header!")
+            split = content_range.split("/")
+            self.size = int(split[1])
+            self.chunks = int(math.ceil(self.size / ChannelManager.chunk_size))
+            first_chunk = response.buffer
+            self.available = [False for _ in range(self.chunks)]
+            self.requested = [False for _ in range(self.chunks)]
+            self.buffer = [b"" for _ in range(self.chunks)]
+            self.__internal_stream = CdnManager.Streamer.InternalStream(
+                self, False)
+            self.requested[0] = True
+            self.write_chunk(first_chunk, 0, False)
+
+        def write_chunk(self, chunk: bytes, chunk_index: int,
+                        cached: bool) -> None:
+            if self.__internal_stream.is_closed():
+                return
+            self.__session.logger.debug(
+                "Chunk {}/{} completed, cached: {}, stream: {}".format(
+                    chunk_index + 1, self.chunks, cached, self.describe()))
+            self.buffer[chunk_index] = self.__audio_decrypt.decrypt_chunk(
+                chunk_index, chunk)
+            self.__internal_stream.notify_chunk_available(chunk_index)
+
+        def stream(self) -> AbsChunkedInputStream:
+            return self.__internal_stream
+
+        def codec(self) -> SuperAudioFormat:
+            return self.__audio_format
+
+        def describe(self) -> str:
+            if self.__stream_id.is_episode():
+                return "episode_gid: {}".format(
+                    self.__stream_id.get_episode_gid())
+            return "file_id: {}".format(self.__stream_id.get_file_id())
+
+        def decrypt_time_ms(self) -> int:
+            return self.__audio_decrypt.decrypt_time_ms()
+
+        def request_chunk(self, index: int) -> None:
+            response = self.request(index)
+            self.write_chunk(response.buffer, index, False)
+
+        def request(self, chunk: int = None, range_start: int = None, range_end: int = None)\
+                -> CdnManager.InternalResponse:
+            if chunk is None and range_start is None and range_end is None:
+                raise TypeError()
+            if chunk is not None:
+                range_start = ChannelManager.chunk_size * chunk
+                range_end = (chunk + 1) * ChannelManager.chunk_size - 1
+            response = self.__session.client().get(
+                self.__cdn_url.url,
+                headers={
+                    "Range": "bytes={}-{}".format(range_start, range_end)
+                },
+            )
+            if response.status_code != 206:
+                raise IOError(response.status_code)
+            body = response.content
+            if body is None:
+                raise IOError("Response body is empty!")
+            return CdnManager.InternalResponse(body, dict(response.headers))
+
+        class InternalStream(AbsChunkedInputStream):
+            streamer: CdnManager.Streamer
+
+            def __init__(self, streamer, retry_on_chunk_error: bool):
+                self.streamer: CdnManager.Streamer = streamer
+                super().__init__(retry_on_chunk_error)
+
+            def buffer(self) -> typing.List[bytes]:
+                return self.streamer.buffer
+
+            def size(self) -> int:
+                return self.streamer.size
+
+            def close(self) -> None:
+                super().close()
+                del self.streamer.buffer
+
+            def requested_chunks(self) -> typing.List[bool]:
+                return self.streamer.requested
+
+            def available_chunks(self) -> typing.List[bool]:
+                return self.streamer.available
+
+            def chunks(self) -> int:
+                return self.streamer.chunks
+
+            def request_chunk_from_stream(self, index: int) -> None:
+                self.streamer.executor_service \
+                    .submit(lambda: self.streamer.request_chunk(index))
+
+            def stream_read_halted(self, chunk: int, _time: int) -> None:
+                if self.streamer.halt_listener is not None:
+                    self.streamer.executor_service\
+                        .submit(lambda: self.streamer.halt_listener.stream_read_halted(chunk, _time))
+
+            def stream_read_resumed(self, chunk: int, _time: int) -> None:
+                if self.streamer.halt_listener is not None:
+                    self.streamer.executor_service \
+                        .submit(lambda: self.streamer.halt_listener.stream_read_resumed(chunk, _time))
+
+
+class NormalizationData:
+    _LOGGER: logging = logging.getLogger(__name__)
+    track_gain_db: float
+    track_peak: float
+    album_gain_db: float
+    album_peak: float
+
+    def __init__(self, track_gain_db: float, track_peak: float,
+                 album_gain_db: float, album_peak: float):
+        self.track_gain_db = track_gain_db
+        self.track_peak = track_peak
+        self.album_gain_db = album_gain_db
+        self.album_peak = album_peak
+
+        self._LOGGER.debug(
+            "Loaded normalization data, track_gain: {}, track_peak: {}, album_gain: {}, album_peak: {}"
+            .format(track_gain_db, track_peak, album_gain_db, album_peak))
+
+    @staticmethod
+    def read(input_stream: AbsChunkedInputStream) -> NormalizationData:
+        input_stream.seek(144)
+        data = input_stream.read(4 * 4)
+        input_stream.seek(0)
+        buffer = io.BytesIO(data)
+        return NormalizationData(
+            struct.unpack("<f", buffer.read(4))[0],
+            struct.unpack("<f", buffer.read(4))[0],
+            struct.unpack("<f", buffer.read(4))[0],
+            struct.unpack("<f", buffer.read(4))[0])
+
+    def get_factor(self, normalisation_pregain) -> float:
+        normalisation_factor = float(
+            math.pow(10, (self.track_gain_db + normalisation_pregain) / 20))
+        if normalisation_factor * self.track_peak > 1:
+            self._LOGGER \
+                .warning("Reducing normalisation factor to prevent clipping. Please add negative pregain to avoid.")
+            normalisation_factor = 1 / self.track_peak
+        return normalisation_factor
+
+
+class PlayableContentFeeder:
+    logger = logging.getLogger("Librespot:PlayableContentFeeder")
+    storage_resolve_interactive = "/storage-resolve/files/audio/interactive/{}"
+    storage_resolve_interactive_prefetch = "/storage-resolve/files/audio/interactive_prefetch/{}"
+    __session: Session
+
+    def __init__(self, session: Session):
+        self.__session = session
+
+    def load(self, playable_id: PlayableId,
+             audio_quality_picker: AudioQualityPicker, preload: bool,
+             halt_listener: typing.Union[HaltListener, None]):
+        if type(playable_id) is TrackId:
+            return self.load_track(playable_id, audio_quality_picker, preload,
+                                   halt_listener)
+        if type(playable_id) is EpisodeId:
+            return self.load_episode(playable_id, audio_quality_picker,
+                                     preload, halt_listener)
+        raise TypeError("Unknown content: {}".format(playable_id))
+
+    def load_stream(self, file: Metadata.AudioFile, track: Metadata.Track,
+                    episode: Metadata.Episode, preload: bool,
+                    halt_lister: HaltListener):
+        if track is None and episode is None:
+            raise RuntimeError()
+        response = self.resolve_storage_interactive(file.file_id, preload)
+        if response.result == StorageResolve.StorageResolveResponse.Result.CDN:
+            if track is not None:
+                return CdnFeedHelper.load_track(self.__session, track, file,
+                                                response, preload, halt_lister)
+            return CdnFeedHelper.load_episode(self.__session, episode, file,
+                                              response, preload, halt_lister)
+        if response.result == StorageResolve.StorageResolveResponse.Result.STORAGE:
+            if track is None:
+                pass
+        elif response.result == StorageResolve.StorageResolveResponse.Result.RESTRICTED:
+            raise RuntimeError("Content is restricted!")
+        elif response.result == StorageResolve.StorageResolveResponse.Response.UNRECOGNIZED:
+            raise RuntimeError("Content is unrecognized!")
+        else:
+            raise RuntimeError("Unknown result: {}".format(response.result))
+
+    def load_episode(self, episode_id: EpisodeId,
+                     audio_quality_picker: AudioQualityPicker, preload: bool,
+                     halt_listener: HaltListener) -> LoadedStream:
+        episode = self.__session.api().get_metadata_4_episode(episode_id)
+        if episode.external_url:
+            return CdnFeedHelper.load_episode_external(self.__session, episode,
+                                                       halt_listener)
+        file = audio_quality_picker.get_file(episode.audio)
+        if file is None:
+            self.logger.fatal(
+                "Couldn't find any suitable audio file, available: {}".format(
+                    episode.audio))
+        return self.load_stream(file, None, episode, preload, halt_listener)
+
+    def load_track(self, track_id_or_track: typing.Union[TrackId,
+                                                         Metadata.Track],
+                   audio_quality_picker: AudioQualityPicker, preload: bool,
+                   halt_listener: HaltListener):
+        if type(track_id_or_track) is TrackId:
+            original = self.__session.api().get_metadata_4_track(
+                track_id_or_track)
+            track = self.pick_alternative_if_necessary(original)
+            if track is None:
+                raise RuntimeError("Cannot get alternative track")
+        else:
+            track = track_id_or_track
+        file = audio_quality_picker.get_file(track.file)
+        if file is None:
+            self.logger.fatal(
+                "Couldn't find any suitable audio file, available: {}".format(
+                    track.file))
+            raise FeederException()
+        return self.load_stream(file, track, None, preload, halt_listener)
+
+    def pick_alternative_if_necessary(
+            self, track: Metadata.Track) -> typing.Union[Metadata.Track, None]:
+        if len(track.file) > 0:
+            return track
+        for alt in track.alternative:
+            if len(alt.file) > 0:
+                return Metadata.Track(
+                    gid=track.gid,
+                    name=track.name,
+                    album=track.album,
+                    artist=track.artist,
+                    number=track.number,
+                    disc_number=track.disc_number,
+                    duration=track.duration,
+                    popularity=track.popularity,
+                    explicit=track.explicit,
+                    external_id=track.external_id,
+                    restriction=track.restriction,
+                    file=alt.file,
+                    sale_period=track.sale_period,
+                    preview=track.preview,
+                    tags=track.tags,
+                    earliest_live_timestamp=track.earliest_live_timestamp,
+                    has_lyrics=track.has_lyrics,
+                    availability=track.availability,
+                    licensor=track.licensor)
+        return None
+
+    def resolve_storage_interactive(
+            self, file_id: bytes,
+            preload: bool) -> StorageResolve.StorageResolveResponse:
+        resp = self.__session.api().send(
+            "GET",
+            (self.storage_resolve_interactive_prefetch
+             if preload else self.storage_resolve_interactive).format(
+                 util.bytes_to_hex(file_id)),
+            None,
+            None,
+        )
+        if resp.status_code != 200:
+            raise RuntimeError(resp.status_code)
+        body = resp.content
+        if body is None:
+            raise RuntimeError("Response body is empty!")
+        storage_resolve_response = StorageResolve.StorageResolveResponse()
+        storage_resolve_response.ParseFromString(body)
+        return storage_resolve_response
+
+    class LoadedStream:
+        episode: Metadata.Episode
+        track: Metadata.Track
+        input_stream: GeneralAudioStream
+        normalization_data: NormalizationData
+        metrics: PlayableContentFeeder.Metrics
+
+        def __init__(self, track_or_episode: typing.Union[Metadata.Track,
+                                                          Metadata.Episode],
+                     input_stream: GeneralAudioStream,
+                     normalization_data: typing.Union[NormalizationData, None],
+                     metrics: PlayableContentFeeder.Metrics):
+            if type(track_or_episode) is Metadata.Track:
+                self.track = track_or_episode
+                self.episode = None
+            elif type(track_or_episode) is Metadata.Episode:
+                self.track = None
+                self.episode = track_or_episode
+            else:
+                raise TypeError()
+            self.input_stream = input_stream
+            self.normalization_data = normalization_data
+            self.metrics = metrics
+
+    class Metrics:
+        file_id: str
+        preloaded_audio_key: bool
+        audio_key_time: int
+
+        def __init__(self, file_id: typing.Union[bytes, None],
+                     preloaded_audio_key: bool, audio_key_time: int):
+            self.file_id = None if file_id is None else util.bytes_to_hex(
+                file_id)
+            self.preloaded_audio_key = preloaded_audio_key
+            self.audio_key_time = audio_key_time
+            if preloaded_audio_key and audio_key_time != -1:
+                raise RuntimeError()
+
+
+class StreamId:
+    file_id: bytes
+    episode_gid: bytes
+
+    def __init__(self,
+                 file: Metadata.AudioFile = None,
+                 episode: Metadata.Episode = None):
+        if file is None and episode is None:
+            return
+        self.file_id = None if file is None else file.file_id
+        self.episode_gid = None if episode is None else episode.gid
+
+    def get_file_id(self):
+        if self.file_id is None:
+            raise RuntimeError("Not a file!")
+        return util.bytes_to_hex(self.file_id)
+
+    def is_episode(self):
+        return self.episode_gid is not None
+
+    def get_episode_gid(self):
+        if self.episode_gid is None:
+            raise RuntimeError("Not an episode!")
+        return util.bytes_to_hex(self.episode_gid)

resources/lib/librespot/audio/decoders.py

@@ -0,0 +1,81 @@
+from __future__ import annotations
+from librespot.audio import SuperAudioFormat
+from librespot.proto import Metadata_pb2 as Metadata
+from librespot.proto.Metadata_pb2 import AudioFile
+from librespot.structure import AudioQualityPicker
+import enum
+import logging
+import typing
+
+
+class AudioQuality(enum.Enum):
+    NORMAL = 0x00
+    HIGH = 0x01
+    VERY_HIGH = 0x02
+
+    @staticmethod
+    def get_quality(audio_format: AudioFile.Format) -> AudioQuality:
+        if audio_format in [
+                AudioFile.MP3_96,
+                AudioFile.OGG_VORBIS_96,
+                AudioFile.AAC_24_NORM,
+        ]:
+            return AudioQuality.NORMAL
+        if audio_format in [
+                AudioFile.MP3_160,
+                AudioFile.MP3_160_ENC,
+                AudioFile.OGG_VORBIS_160,
+                AudioFile.AAC_24,
+        ]:
+            return AudioQuality.HIGH
+        if audio_format in [
+                AudioFile.MP3_320,
+                AudioFile.MP3_256,
+                AudioFile.OGG_VORBIS_320,
+                AudioFile.AAC_48,
+        ]:
+            return AudioQuality.VERY_HIGH
+        raise RuntimeError("Unknown format: {}".format(format))
+
+    def get_matches(self,
+                    files: typing.List[AudioFile]) -> typing.List[AudioFile]:
+        file_list = []
+        for file in files:
+            if hasattr(file, "format") and AudioQuality.get_quality(
+                    file.format) == self:
+                file_list.append(file)
+        return file_list
+
+
+class VorbisOnlyAudioQuality(AudioQualityPicker):
+    logger = logging.getLogger("Librespot:Player:VorbisOnlyAudioQuality")
+    preferred: AudioQuality
+
+    def __init__(self, preferred: AudioQuality):
+        self.preferred = preferred
+
+    @staticmethod
+    def get_vorbis_file(files: typing.List[Metadata.AudioFile]):
+        for file in files:
+            if file.HasField("format") and SuperAudioFormat.get(
+                    file.format) == SuperAudioFormat.VORBIS:
+                return file
+        return None
+
+    def get_file(self, files: typing.List[Metadata.AudioFile]):
+        matches: typing.List[Metadata.AudioFile] = self.preferred.get_matches(
+            files)
+        vorbis: Metadata.AudioFile = VorbisOnlyAudioQuality.get_vorbis_file(
+            matches)
+        if vorbis is None:
+            vorbis: Metadata.AudioFile = VorbisOnlyAudioQuality.get_vorbis_file(
+                files)
+            if vorbis is not None:
+                self.logger.warning(
+                    "Using {} because preferred {} couldn't be found.".format(
+                        Metadata.AudioFile.Format.Name(vorbis.format),
+                        self.preferred))
+            else:
+                self.logger.fatal(
+                    "Couldn't find any Vorbis file, available: {}")
+        return vorbis

resources/lib/librespot/audio/decrypt.py

@@ -0,0 +1,45 @@
+from __future__ import annotations
+from Cryptodome.Cipher import AES
+from Cryptodome.Util import Counter
+from librespot.audio.storage import ChannelManager
+from librespot.structure import AudioDecrypt
+import io
+import time
+
+
+class AesAudioDecrypt(AudioDecrypt):
+    audio_aes_iv = b'r\xe0g\xfb\xdd\xcb\xcfw\xeb\xe8\xbcd?c\r\x93'
+    cipher = None
+    decrypt_count = 0
+    decrypt_total_time = 0
+    iv_int = int.from_bytes(audio_aes_iv, "big")
+    iv_diff = 0x100
+    key: bytes
+
+    def __init__(self, key: bytes):
+        self.key = key
+
+    def decrypt_chunk(self, chunk_index: int, buffer: bytes):
+        new_buffer = io.BytesIO()
+        iv = self.iv_int + int(ChannelManager.chunk_size * chunk_index / 16)
+        start = time.time_ns()
+        for i in range(0, len(buffer), 4096):
+            cipher = AES.new(key=self.key,
+                             mode=AES.MODE_CTR,
+                             counter=Counter.new(128, initial_value=iv))
+            count = min(4096, len(buffer) - i)
+            decrypted_buffer = cipher.decrypt(buffer[i:i + count])
+            new_buffer.write(decrypted_buffer)
+            if count != len(decrypted_buffer):
+                raise RuntimeError(
+                    "Couldn't process all data, actual: {}, expected: {}".
+                    format(len(decrypted_buffer), count))
+            iv += self.iv_diff
+        self.decrypt_total_time += time.time_ns() - start
+        self.decrypt_count += 1
+        new_buffer.seek(0)
+        return new_buffer.read()
+
+    def decrypt_time_ms(self):
+        return 0 if self.decrypt_count == 0 else int(
+            (self.decrypt_total_time / self.decrypt_count) / 1000000)

resources/lib/librespot/audio/format.py

@@ -0,0 +1,32 @@
+from librespot.proto import Metadata_pb2 as Metadata
+import enum
+
+
+class SuperAudioFormat(enum.Enum):
+    MP3 = 0x00
+    VORBIS = 0x01
+    AAC = 0x02
+
+    @staticmethod
+    def get(audio_format: Metadata.AudioFile.Format):
+        if audio_format in [
+                Metadata.AudioFile.Format.OGG_VORBIS_96,
+                Metadata.AudioFile.Format.OGG_VORBIS_160,
+                Metadata.AudioFile.Format.OGG_VORBIS_320,
+        ]:
+            return SuperAudioFormat.VORBIS
+        if audio_format in [
+                Metadata.AudioFile.Format.MP3_256,
+                Metadata.AudioFile.Format.MP3_320,
+                Metadata.AudioFile.Format.MP3_160,
+                Metadata.AudioFile.Format.MP3_96,
+                Metadata.AudioFile.Format.MP3_160_ENC,
+        ]:
+            return SuperAudioFormat.MP3
+        if audio_format in [
+                Metadata.AudioFile.Format.AAC_24,
+                Metadata.AudioFile.Format.AAC_48,
+                Metadata.AudioFile.Format.AAC_24_NORM,
+        ]:
+            return SuperAudioFormat.AAC
+        raise RuntimeError("Unknown audio format: {}".format(audio_format))

resources/lib/librespot/audio/storage.py

@@ -0,0 +1,139 @@
+from __future__ import annotations
+from librespot import util
+from librespot.crypto import Packet
+from librespot.proto.Metadata_pb2 import AudioFile
+from librespot.structure import Closeable, PacketsReceiver
+import concurrent.futures
+import io
+import logging
+import queue
+import struct
+import threading
+import typing
+
+if typing.TYPE_CHECKING:
+    from librespot.core import Session
+
+
+class ChannelManager(Closeable, PacketsReceiver):
+    channels: typing.Dict[int, Channel] = {}
+    chunk_size = 128 * 1024
+    executor_service = concurrent.futures.ThreadPoolExecutor()
+    logger = logging.getLogger("Librespot:ChannelManager")
+    seq_holder = 0
+    seq_holder_lock = threading.Condition()
+    __session: Session = None
+
+    def __init__(self, session: Session):
+        self.__session = session
+
+    def request_chunk(self, file_id: bytes, index: int, file: AudioFile):
+        start = int(index * self.chunk_size / 4)
+        end = int((index + 1) * self.chunk_size / 4)
+        channel = ChannelManager.Channel(self, file, index)
+        self.channels[channel.chunk_id] = channel
+        out = io.BytesIO()
+        out.write(struct.pack(">H", channel.chunk_id))
+        out.write(struct.pack(">i", 0x00000000))
+        out.write(struct.pack(">i", 0x00000000))
+        out.write(struct.pack(">i", 0x00004E20))
+        out.write(struct.pack(">i", 0x00030D40))
+        out.write(file_id)
+        out.write(struct.pack(">i", start))
+        out.write(struct.pack(">i", end))
+        out.seek(0)
+        self.__session.send(Packet.Type.stream_chunk, out.read())
+
+    def dispatch(self, packet: Packet) -> None:
+        payload = io.BytesIO(packet.payload)
+        if packet.is_cmd(Packet.Type.stream_chunk_res):
+            chunk_id = struct.unpack(">H", payload.read(2))[0]
+            channel = self.channels.get(chunk_id)
+            if channel is None:
+                self.logger.warning(
+                    "Couldn't find channel, id: {}, received: {}".format(
+                        chunk_id, len(packet.payload)))
+                return
+            channel.add_to_queue(payload)
+        elif packet.is_cmd(Packet.Type.channel_error):
+            chunk_id = struct.unpack(">H", payload.read(2))[0]
+            channel = self.channels.get(chunk_id)
+            if channel is None:
+                self.logger.warning(
+                    "Dropping channel error, id: {}, code: {}".format(
+                        chunk_id,
+                        struct.unpack(">H", payload.read(2))[0]))
+                return
+            channel.stream_error(struct.unpack(">H", payload.read(2))[0])
+        else:
+            self.logger.warning(
+                "Couldn't handle packet, cmd: {}, payload: {}".format(
+                    packet.cmd, util.bytes_to_hex(packet.payload)))
+
+    def close(self) -> None:
+        self.executor_service.shutdown()
+
+    class Channel:
+        channel_manager: ChannelManager
+        chunk_id: int
+        q = queue.Queue()
+        __buffer: io.BytesIO
+        __chunk_index: int
+        __file: AudioFile
+        __header: bool = True
+
+        def __init__(self, channel_manager: ChannelManager, file: AudioFile,
+                     chunk_index: int):
+            self.__buffer = io.BytesIO()
+            self.channel_manager = channel_manager
+            self.__file = file
+            self.__chunk_index = chunk_index
+            with self.channel_manager.seq_holder_lock:
+                self.chunk_id = self.channel_manager.seq_holder
+                self.channel_manager.seq_holder += 1
+            self.channel_manager.executor_service.submit(
+                lambda: ChannelManager.Channel.Handler(self))
+
+        def _handle(self, payload: bytes) -> bool:
+            if len(payload) == 0:
+                if not self.__header:
+                    self.__file.write_chunk(payload, self.__chunk_index, False)
+                    return True
+                self.channel_manager.logger.debug(
+                    "Received empty chunk, skipping.")
+                return False
+            if self.__header:
+                length: int
+                while len(payload.buffer) > 0:
+                    length = payload.read_short()
+                    if not length > 0:
+                        break
+                    header_id = payload.read_byte()
+                    header_data = payload.read(length - 1)
+                    self.__file.write_header(int.from_bytes(header_id, "big"),
+                                             bytearray(header_data), False)
+                self.__header = False
+            else:
+                self.__buffer.write(payload.read(len(payload.buffer)))
+            return False
+
+        def add_to_queue(self, payload):
+            self.q.put(payload)
+
+        def stream_error(self, code: int) -> None:
+            self.__file.stream_error(self.__chunk_index, code)
+
+        class Handler:
+            __channel: ChannelManager.Channel = None
+
+            def __init__(self, channel: ChannelManager.Channel):
+                self.__channel = channel
+
+            def run(self) -> None:
+                self.__channel.channel_manager.logger.debug(
+                    "ChannelManager.Handler is starting")
+                with self.__channel.q.all_tasks_done:
+                    self.__channel.channel_manager.channels.pop(
+                        self.__channel.chunk_id)
+                self.__channel.channel_manager.logger.debug(
+                    "ChannelManager.Handler is shutting down")

resources/lib/librespot/cache.py

@@ -0,0 +1,18 @@
+from __future__ import annotations
+import typing
+
+if typing.TYPE_CHECKING:
+    from librespot.core import Session
+
+
+class CacheManager:
+    clean_up_threshold = 604800000
+    header_hash = 253
+    header_timestamp = 254
+    parent: str
+
+    def __init__(self, session: Session):
+        """
+        @Todo Implement function
+        :param session:
+        """