873 lines
30 KiB
Python
873 lines
30 KiB
Python
# -*- coding: utf-8 -*-
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"""
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requests.models
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~~~~~~~~~~~~~~~
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This module contains the primary objects that power Requests.
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"""
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import collections
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import datetime
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from io import BytesIO, UnsupportedOperation
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from .hooks import default_hooks
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from .structures import CaseInsensitiveDict
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from .auth import HTTPBasicAuth
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from .cookies import cookiejar_from_dict, get_cookie_header, _copy_cookie_jar
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from .packages.urllib3.fields import RequestField
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from .packages.urllib3.filepost import encode_multipart_formdata
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from .packages.urllib3.util import parse_url
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from .packages.urllib3.exceptions import (
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DecodeError, ReadTimeoutError, ProtocolError, LocationParseError)
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from .exceptions import (
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HTTPError, MissingSchema, InvalidURL, ChunkedEncodingError,
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ContentDecodingError, ConnectionError, StreamConsumedError)
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from .utils import (
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guess_filename, get_auth_from_url, requote_uri,
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stream_decode_response_unicode, to_key_val_list, parse_header_links,
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iter_slices, guess_json_utf, super_len, to_native_string,
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check_header_validity)
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from .compat import (
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cookielib, urlunparse, urlsplit, urlencode, str, bytes, StringIO,
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is_py2, chardet, builtin_str, basestring)
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from .compat import json as complexjson
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from .status_codes import codes
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#: The set of HTTP status codes that indicate an automatically
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#: processable redirect.
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REDIRECT_STATI = (
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codes.moved, # 301
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codes.found, # 302
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codes.other, # 303
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codes.temporary_redirect, # 307
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codes.permanent_redirect, # 308
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)
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DEFAULT_REDIRECT_LIMIT = 30
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CONTENT_CHUNK_SIZE = 10 * 1024
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ITER_CHUNK_SIZE = 512
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class RequestEncodingMixin(object):
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@property
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def path_url(self):
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"""Build the path URL to use."""
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url = []
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p = urlsplit(self.url)
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path = p.path
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if not path:
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path = '/'
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url.append(path)
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query = p.query
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if query:
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url.append('?')
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url.append(query)
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return ''.join(url)
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@staticmethod
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def _encode_params(data):
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"""Encode parameters in a piece of data.
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Will successfully encode parameters when passed as a dict or a list of
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2-tuples. Order is retained if data is a list of 2-tuples but arbitrary
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if parameters are supplied as a dict.
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"""
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if isinstance(data, (str, bytes)):
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return data
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elif hasattr(data, 'read'):
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return data
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elif hasattr(data, '__iter__'):
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result = []
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for k, vs in to_key_val_list(data):
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if isinstance(vs, basestring) or not hasattr(vs, '__iter__'):
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vs = [vs]
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for v in vs:
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if v is not None:
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result.append(
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(k.encode('utf-8') if isinstance(k, str) else k,
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v.encode('utf-8') if isinstance(v, str) else v))
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return urlencode(result, doseq=True)
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else:
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return data
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@staticmethod
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def _encode_files(files, data):
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"""Build the body for a multipart/form-data request.
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Will successfully encode files when passed as a dict or a list of
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tuples. Order is retained if data is a list of tuples but arbitrary
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if parameters are supplied as a dict.
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The tuples may be 2-tuples (filename, fileobj), 3-tuples (filename, fileobj, contentype)
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or 4-tuples (filename, fileobj, contentype, custom_headers).
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"""
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if (not files):
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raise ValueError("Files must be provided.")
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elif isinstance(data, basestring):
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raise ValueError("Data must not be a string.")
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new_fields = []
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fields = to_key_val_list(data or {})
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files = to_key_val_list(files or {})
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for field, val in fields:
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if isinstance(val, basestring) or not hasattr(val, '__iter__'):
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val = [val]
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for v in val:
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if v is not None:
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# Don't call str() on bytestrings: in Py3 it all goes wrong.
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if not isinstance(v, bytes):
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v = str(v)
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new_fields.append(
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(field.decode('utf-8') if isinstance(field, bytes) else field,
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v.encode('utf-8') if isinstance(v, str) else v))
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for (k, v) in files:
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# support for explicit filename
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ft = None
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fh = None
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if isinstance(v, (tuple, list)):
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if len(v) == 2:
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fn, fp = v
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elif len(v) == 3:
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fn, fp, ft = v
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else:
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fn, fp, ft, fh = v
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else:
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fn = guess_filename(v) or k
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fp = v
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if isinstance(fp, (str, bytes, bytearray)):
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fdata = fp
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else:
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fdata = fp.read()
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rf = RequestField(name=k, data=fdata, filename=fn, headers=fh)
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rf.make_multipart(content_type=ft)
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new_fields.append(rf)
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body, content_type = encode_multipart_formdata(new_fields)
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return body, content_type
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class RequestHooksMixin(object):
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def register_hook(self, event, hook):
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"""Properly register a hook."""
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if event not in self.hooks:
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raise ValueError('Unsupported event specified, with event name "%s"' % (event))
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if isinstance(hook, collections.Callable):
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self.hooks[event].append(hook)
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elif hasattr(hook, '__iter__'):
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self.hooks[event].extend(h for h in hook if isinstance(h, collections.Callable))
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def deregister_hook(self, event, hook):
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"""Deregister a previously registered hook.
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Returns True if the hook existed, False if not.
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"""
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try:
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self.hooks[event].remove(hook)
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return True
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except ValueError:
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return False
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class Request(RequestHooksMixin):
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"""A user-created :class:`Request <Request>` object.
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Used to prepare a :class:`PreparedRequest <PreparedRequest>`, which is sent to the server.
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:param method: HTTP method to use.
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:param url: URL to send.
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:param headers: dictionary of headers to send.
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:param files: dictionary of {filename: fileobject} files to multipart upload.
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:param data: the body to attach to the request. If a dictionary is provided, form-encoding will take place.
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:param json: json for the body to attach to the request (if files or data is not specified).
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:param params: dictionary of URL parameters to append to the URL.
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:param auth: Auth handler or (user, pass) tuple.
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:param cookies: dictionary or CookieJar of cookies to attach to this request.
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:param hooks: dictionary of callback hooks, for internal usage.
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Usage::
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>>> import requests
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>>> req = requests.Request('GET', 'http://httpbin.org/get')
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>>> req.prepare()
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<PreparedRequest [GET]>
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"""
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def __init__(self, method=None, url=None, headers=None, files=None,
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data=None, params=None, auth=None, cookies=None, hooks=None, json=None):
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# Default empty dicts for dict params.
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data = [] if data is None else data
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files = [] if files is None else files
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headers = {} if headers is None else headers
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params = {} if params is None else params
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hooks = {} if hooks is None else hooks
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self.hooks = default_hooks()
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for (k, v) in list(hooks.items()):
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self.register_hook(event=k, hook=v)
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self.method = method
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self.url = url
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self.headers = headers
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self.files = files
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self.data = data
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self.json = json
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self.params = params
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self.auth = auth
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self.cookies = cookies
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def __repr__(self):
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return '<Request [%s]>' % (self.method)
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def prepare(self):
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"""Constructs a :class:`PreparedRequest <PreparedRequest>` for transmission and returns it."""
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p = PreparedRequest()
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p.prepare(
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method=self.method,
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url=self.url,
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headers=self.headers,
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files=self.files,
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data=self.data,
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json=self.json,
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params=self.params,
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auth=self.auth,
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cookies=self.cookies,
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hooks=self.hooks,
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)
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return p
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class PreparedRequest(RequestEncodingMixin, RequestHooksMixin):
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"""The fully mutable :class:`PreparedRequest <PreparedRequest>` object,
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containing the exact bytes that will be sent to the server.
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Generated from either a :class:`Request <Request>` object or manually.
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Usage::
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>>> import requests
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>>> req = requests.Request('GET', 'http://httpbin.org/get')
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>>> r = req.prepare()
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<PreparedRequest [GET]>
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>>> s = requests.Session()
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>>> s.send(r)
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<Response [200]>
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"""
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def __init__(self):
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#: HTTP verb to send to the server.
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self.method = None
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#: HTTP URL to send the request to.
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self.url = None
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#: dictionary of HTTP headers.
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self.headers = None
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# The `CookieJar` used to create the Cookie header will be stored here
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# after prepare_cookies is called
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self._cookies = None
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#: request body to send to the server.
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self.body = None
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#: dictionary of callback hooks, for internal usage.
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self.hooks = default_hooks()
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def prepare(self, method=None, url=None, headers=None, files=None,
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data=None, params=None, auth=None, cookies=None, hooks=None, json=None):
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"""Prepares the entire request with the given parameters."""
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self.prepare_method(method)
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self.prepare_url(url, params)
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self.prepare_headers(headers)
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self.prepare_cookies(cookies)
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self.prepare_body(data, files, json)
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self.prepare_auth(auth, url)
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# Note that prepare_auth must be last to enable authentication schemes
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# such as OAuth to work on a fully prepared request.
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# This MUST go after prepare_auth. Authenticators could add a hook
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self.prepare_hooks(hooks)
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def __repr__(self):
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return '<PreparedRequest [%s]>' % (self.method)
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def copy(self):
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p = PreparedRequest()
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p.method = self.method
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p.url = self.url
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p.headers = self.headers.copy() if self.headers is not None else None
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p._cookies = _copy_cookie_jar(self._cookies)
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p.body = self.body
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p.hooks = self.hooks
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return p
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def prepare_method(self, method):
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"""Prepares the given HTTP method."""
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self.method = method
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if self.method is not None:
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self.method = to_native_string(self.method.upper())
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def prepare_url(self, url, params):
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"""Prepares the given HTTP URL."""
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#: Accept objects that have string representations.
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#: We're unable to blindly call unicode/str functions
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#: as this will include the bytestring indicator (b'')
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#: on python 3.x.
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#: https://github.com/kennethreitz/requests/pull/2238
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if isinstance(url, bytes):
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url = url.decode('utf8')
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else:
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url = unicode(url) if is_py2 else str(url)
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# Don't do any URL preparation for non-HTTP schemes like `mailto`,
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# `data` etc to work around exceptions from `url_parse`, which
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# handles RFC 3986 only.
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if ':' in url and not url.lower().startswith('http'):
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self.url = url
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return
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# Support for unicode domain names and paths.
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try:
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scheme, auth, host, port, path, query, fragment = parse_url(url)
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except LocationParseError as e:
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raise InvalidURL(*e.args)
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if not scheme:
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error = ("Invalid URL {0!r}: No schema supplied. Perhaps you meant http://{0}?")
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error = error.format(to_native_string(url, 'utf8'))
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raise MissingSchema(error)
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if not host:
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raise InvalidURL("Invalid URL %r: No host supplied" % url)
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# Only want to apply IDNA to the hostname
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try:
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host = host.encode('idna').decode('utf-8')
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except UnicodeError:
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raise InvalidURL('URL has an invalid label.')
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# Carefully reconstruct the network location
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netloc = auth or ''
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if netloc:
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netloc += '@'
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netloc += host
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if port:
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netloc += ':' + str(port)
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# Bare domains aren't valid URLs.
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if not path:
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path = '/'
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if is_py2:
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if isinstance(scheme, str):
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scheme = scheme.encode('utf-8')
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if isinstance(netloc, str):
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netloc = netloc.encode('utf-8')
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if isinstance(path, str):
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path = path.encode('utf-8')
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if isinstance(query, str):
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query = query.encode('utf-8')
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if isinstance(fragment, str):
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fragment = fragment.encode('utf-8')
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if isinstance(params, (str, bytes)):
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params = to_native_string(params)
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enc_params = self._encode_params(params)
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if enc_params:
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if query:
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query = '%s&%s' % (query, enc_params)
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else:
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query = enc_params
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url = requote_uri(urlunparse([scheme, netloc, path, None, query, fragment]))
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self.url = url
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def prepare_headers(self, headers):
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"""Prepares the given HTTP headers."""
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self.headers = CaseInsensitiveDict()
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if headers:
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for header in headers.items():
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# Raise exception on invalid header value.
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check_header_validity(header)
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name, value = header
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self.headers[to_native_string(name)] = value
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def prepare_body(self, data, files, json=None):
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"""Prepares the given HTTP body data."""
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# Check if file, fo, generator, iterator.
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# If not, run through normal process.
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# Nottin' on you.
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body = None
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content_type = None
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length = None
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if not data and json is not None:
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# urllib3 requires a bytes-like body. Python 2's json.dumps
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# provides this natively, but Python 3 gives a Unicode string.
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content_type = 'application/json'
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body = complexjson.dumps(json)
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if not isinstance(body, bytes):
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body = body.encode('utf-8')
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is_stream = all([
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hasattr(data, '__iter__'),
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not isinstance(data, (basestring, list, tuple, dict))
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])
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try:
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length = super_len(data)
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except (TypeError, AttributeError, UnsupportedOperation):
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length = None
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if is_stream:
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body = data
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if files:
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raise NotImplementedError('Streamed bodies and files are mutually exclusive.')
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if length:
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self.headers['Content-Length'] = builtin_str(length)
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else:
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self.headers['Transfer-Encoding'] = 'chunked'
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else:
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# Multi-part file uploads.
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if files:
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(body, content_type) = self._encode_files(files, data)
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else:
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if data:
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body = self._encode_params(data)
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if isinstance(data, basestring) or hasattr(data, 'read'):
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content_type = None
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else:
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content_type = 'application/x-www-form-urlencoded'
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self.prepare_content_length(body)
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# Add content-type if it wasn't explicitly provided.
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if content_type and ('content-type' not in self.headers):
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self.headers['Content-Type'] = content_type
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self.body = body
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def prepare_content_length(self, body):
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if hasattr(body, 'seek') and hasattr(body, 'tell'):
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curr_pos = body.tell()
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body.seek(0, 2)
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end_pos = body.tell()
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self.headers['Content-Length'] = builtin_str(max(0, end_pos - curr_pos))
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body.seek(curr_pos, 0)
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elif body is not None:
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l = super_len(body)
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if l:
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self.headers['Content-Length'] = builtin_str(l)
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elif (self.method not in ('GET', 'HEAD')) and (self.headers.get('Content-Length') is None):
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self.headers['Content-Length'] = '0'
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def prepare_auth(self, auth, url=''):
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"""Prepares the given HTTP auth data."""
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# If no Auth is explicitly provided, extract it from the URL first.
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if auth is None:
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url_auth = get_auth_from_url(self.url)
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auth = url_auth if any(url_auth) else None
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if auth:
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if isinstance(auth, tuple) and len(auth) == 2:
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# special-case basic HTTP auth
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auth = HTTPBasicAuth(*auth)
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# Allow auth to make its changes.
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r = auth(self)
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# Update self to reflect the auth changes.
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self.__dict__.update(r.__dict__)
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# Recompute Content-Length
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self.prepare_content_length(self.body)
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def prepare_cookies(self, cookies):
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"""Prepares the given HTTP cookie data.
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This function eventually generates a ``Cookie`` header from the
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given cookies using cookielib. Due to cookielib's design, the header
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will not be regenerated if it already exists, meaning this function
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can only be called once for the life of the
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:class:`PreparedRequest <PreparedRequest>` object. Any subsequent calls
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to ``prepare_cookies`` will have no actual effect, unless the "Cookie"
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header is removed beforehand.
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"""
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if isinstance(cookies, cookielib.CookieJar):
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self._cookies = cookies
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else:
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self._cookies = cookiejar_from_dict(cookies)
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cookie_header = get_cookie_header(self._cookies, self)
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if cookie_header is not None:
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self.headers['Cookie'] = cookie_header
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def prepare_hooks(self, hooks):
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"""Prepares the given hooks."""
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# hooks can be passed as None to the prepare method and to this
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# method. To prevent iterating over None, simply use an empty list
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# if hooks is False-y
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hooks = hooks or []
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for event in hooks:
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self.register_hook(event, hooks[event])
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class Response(object):
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"""The :class:`Response <Response>` object, which contains a
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server's response to an HTTP request.
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"""
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__attrs__ = [
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'_content', 'status_code', 'headers', 'url', 'history',
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'encoding', 'reason', 'cookies', 'elapsed', 'request'
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]
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def __init__(self):
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super(Response, self).__init__()
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self._content = False
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self._content_consumed = False
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#: Integer Code of responded HTTP Status, e.g. 404 or 200.
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self.status_code = None
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#: Case-insensitive Dictionary of Response Headers.
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#: For example, ``headers['content-encoding']`` will return the
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#: value of a ``'Content-Encoding'`` response header.
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self.headers = CaseInsensitiveDict()
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#: File-like object representation of response (for advanced usage).
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#: Use of ``raw`` requires that ``stream=True`` be set on the request.
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# This requirement does not apply for use internally to Requests.
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self.raw = None
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#: Final URL location of Response.
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self.url = None
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#: Encoding to decode with when accessing r.text.
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self.encoding = None
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#: A list of :class:`Response <Response>` objects from
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#: the history of the Request. Any redirect responses will end
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#: up here. The list is sorted from the oldest to the most recent request.
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self.history = []
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#: Textual reason of responded HTTP Status, e.g. "Not Found" or "OK".
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self.reason = None
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#: A CookieJar of Cookies the server sent back.
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self.cookies = cookiejar_from_dict({})
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#: The amount of time elapsed between sending the request
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#: and the arrival of the response (as a timedelta).
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#: This property specifically measures the time taken between sending
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#: the first byte of the request and finishing parsing the headers. It
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#: is therefore unaffected by consuming the response content or the
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#: value of the ``stream`` keyword argument.
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self.elapsed = datetime.timedelta(0)
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#: The :class:`PreparedRequest <PreparedRequest>` object to which this
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#: is a response.
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self.request = None
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def __getstate__(self):
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# Consume everything; accessing the content attribute makes
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# sure the content has been fully read.
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if not self._content_consumed:
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self.content
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return dict(
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(attr, getattr(self, attr, None))
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for attr in self.__attrs__
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)
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def __setstate__(self, state):
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for name, value in state.items():
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setattr(self, name, value)
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# pickled objects do not have .raw
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setattr(self, '_content_consumed', True)
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setattr(self, 'raw', None)
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def __repr__(self):
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return '<Response [%s]>' % (self.status_code)
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def __bool__(self):
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"""Returns true if :attr:`status_code` is 'OK'."""
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return self.ok
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def __nonzero__(self):
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"""Returns true if :attr:`status_code` is 'OK'."""
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return self.ok
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def __iter__(self):
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"""Allows you to use a response as an iterator."""
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return self.iter_content(128)
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@property
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def ok(self):
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try:
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self.raise_for_status()
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except HTTPError:
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return False
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return True
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@property
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def is_redirect(self):
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"""True if this Response is a well-formed HTTP redirect that could have
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been processed automatically (by :meth:`Session.resolve_redirects`).
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"""
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return ('location' in self.headers and self.status_code in REDIRECT_STATI)
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@property
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def is_permanent_redirect(self):
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"""True if this Response one of the permanent versions of redirect"""
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return ('location' in self.headers and self.status_code in (codes.moved_permanently, codes.permanent_redirect))
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@property
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def apparent_encoding(self):
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"""The apparent encoding, provided by the chardet library"""
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return chardet.detect(self.content)['encoding']
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def iter_content(self, chunk_size=1, decode_unicode=False):
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"""Iterates over the response data. When stream=True is set on the
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request, this avoids reading the content at once into memory for
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large responses. The chunk size is the number of bytes it should
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read into memory. This is not necessarily the length of each item
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returned as decoding can take place.
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chunk_size must be of type int or None. A value of None will
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function differently depending on the value of `stream`.
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stream=True will read data as it arrives in whatever size the
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chunks are received. If stream=False, data is returned as
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a single chunk.
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If decode_unicode is True, content will be decoded using the best
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available encoding based on the response.
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"""
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def generate():
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# Special case for urllib3.
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if hasattr(self.raw, 'stream'):
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try:
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for chunk in self.raw.stream(chunk_size, decode_content=True):
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yield chunk
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except ProtocolError as e:
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raise ChunkedEncodingError(e)
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except DecodeError as e:
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raise ContentDecodingError(e)
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except ReadTimeoutError as e:
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raise ConnectionError(e)
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else:
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# Standard file-like object.
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while True:
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chunk = self.raw.read(chunk_size)
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if not chunk:
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break
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yield chunk
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self._content_consumed = True
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if self._content_consumed and isinstance(self._content, bool):
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raise StreamConsumedError()
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elif chunk_size is not None and not isinstance(chunk_size, int):
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raise TypeError("chunk_size must be an int, it is instead a %s." % type(chunk_size))
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# simulate reading small chunks of the content
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reused_chunks = iter_slices(self._content, chunk_size)
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stream_chunks = generate()
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chunks = reused_chunks if self._content_consumed else stream_chunks
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if decode_unicode:
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chunks = stream_decode_response_unicode(chunks, self)
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return chunks
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def iter_lines(self, chunk_size=ITER_CHUNK_SIZE, decode_unicode=None, delimiter=None):
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"""Iterates over the response data, one line at a time. When
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stream=True is set on the request, this avoids reading the
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content at once into memory for large responses.
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.. note:: This method is not reentrant safe.
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"""
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pending = None
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for chunk in self.iter_content(chunk_size=chunk_size, decode_unicode=decode_unicode):
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if pending is not None:
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chunk = pending + chunk
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if delimiter:
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lines = chunk.split(delimiter)
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else:
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lines = chunk.splitlines()
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if lines and lines[-1] and chunk and lines[-1][-1] == chunk[-1]:
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pending = lines.pop()
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else:
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pending = None
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for line in lines:
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yield line
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if pending is not None:
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yield pending
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@property
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def content(self):
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"""Content of the response, in bytes."""
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if self._content is False:
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# Read the contents.
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try:
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if self._content_consumed:
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raise RuntimeError(
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'The content for this response was already consumed')
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if self.status_code == 0:
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self._content = None
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else:
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self._content = bytes().join(self.iter_content(CONTENT_CHUNK_SIZE)) or bytes()
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except AttributeError:
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self._content = None
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self._content_consumed = True
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# don't need to release the connection; that's been handled by urllib3
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# since we exhausted the data.
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return self._content
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@property
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def text(self):
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"""Content of the response, in unicode.
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If Response.encoding is None, encoding will be guessed using
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``chardet``.
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The encoding of the response content is determined based solely on HTTP
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headers, following RFC 2616 to the letter. If you can take advantage of
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non-HTTP knowledge to make a better guess at the encoding, you should
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set ``r.encoding`` appropriately before accessing this property.
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"""
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# Try charset from content-type
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content = None
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encoding = self.encoding
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if not self.content:
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return str('')
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# Fallback to auto-detected encoding.
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if self.encoding is None:
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encoding = self.apparent_encoding
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# Decode unicode from given encoding.
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try:
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content = str(self.content, encoding, errors='replace')
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except (LookupError, TypeError):
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# A LookupError is raised if the encoding was not found which could
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# indicate a misspelling or similar mistake.
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#
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# A TypeError can be raised if encoding is None
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#
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# So we try blindly encoding.
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content = str(self.content, errors='replace')
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return content
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def json(self, **kwargs):
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"""Returns the json-encoded content of a response, if any.
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:param \*\*kwargs: Optional arguments that ``json.loads`` takes.
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"""
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if not self.encoding and self.content and len(self.content) > 3:
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# No encoding set. JSON RFC 4627 section 3 states we should expect
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# UTF-8, -16 or -32. Detect which one to use; If the detection or
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# decoding fails, fall back to `self.text` (using chardet to make
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# a best guess).
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encoding = guess_json_utf(self.content)
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if encoding is not None:
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try:
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return complexjson.loads(
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self.content.decode(encoding), **kwargs
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)
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except UnicodeDecodeError:
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# Wrong UTF codec detected; usually because it's not UTF-8
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# but some other 8-bit codec. This is an RFC violation,
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# and the server didn't bother to tell us what codec *was*
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# used.
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pass
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return complexjson.loads(self.text, **kwargs)
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@property
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def links(self):
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"""Returns the parsed header links of the response, if any."""
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header = self.headers.get('link')
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# l = MultiDict()
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l = {}
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if header:
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links = parse_header_links(header)
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for link in links:
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key = link.get('rel') or link.get('url')
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l[key] = link
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return l
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def raise_for_status(self):
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"""Raises stored :class:`HTTPError`, if one occurred."""
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http_error_msg = ''
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if isinstance(self.reason, bytes):
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reason = self.reason.decode('utf-8', 'ignore')
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else:
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reason = self.reason
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if 400 <= self.status_code < 500:
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http_error_msg = u'%s Client Error: %s for url: %s' % (self.status_code, reason, self.url)
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elif 500 <= self.status_code < 600:
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http_error_msg = u'%s Server Error: %s for url: %s' % (self.status_code, reason, self.url)
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if http_error_msg:
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raise HTTPError(http_error_msg, response=self)
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def close(self):
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"""Releases the connection back to the pool. Once this method has been
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called the underlying ``raw`` object must not be accessed again.
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*Note: Should not normally need to be called explicitly.*
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"""
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if not self._content_consumed:
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self.raw.close()
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return self.raw.release_conn()
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