2016-01-11 19:21:18 +00:00
|
|
|
from __future__ import absolute_import
|
2015-02-13 03:06:40 +00:00
|
|
|
from base64 import b64encode
|
|
|
|
|
2017-02-21 00:22:21 +00:00
|
|
|
from ..packages.six import b, integer_types
|
|
|
|
from ..exceptions import UnrewindableBodyError
|
2015-02-13 03:06:40 +00:00
|
|
|
|
|
|
|
ACCEPT_ENCODING = 'gzip,deflate'
|
2017-02-21 00:22:21 +00:00
|
|
|
_FAILEDTELL = object()
|
2015-02-13 03:06:40 +00:00
|
|
|
|
|
|
|
|
|
|
|
def make_headers(keep_alive=None, accept_encoding=None, user_agent=None,
|
|
|
|
basic_auth=None, proxy_basic_auth=None, disable_cache=None):
|
|
|
|
"""
|
|
|
|
Shortcuts for generating request headers.
|
|
|
|
|
|
|
|
:param keep_alive:
|
|
|
|
If ``True``, adds 'connection: keep-alive' header.
|
|
|
|
|
|
|
|
:param accept_encoding:
|
|
|
|
Can be a boolean, list, or string.
|
|
|
|
``True`` translates to 'gzip,deflate'.
|
|
|
|
List will get joined by comma.
|
|
|
|
String will be used as provided.
|
|
|
|
|
|
|
|
:param user_agent:
|
|
|
|
String representing the user-agent you want, such as
|
|
|
|
"python-urllib3/0.6"
|
|
|
|
|
|
|
|
:param basic_auth:
|
|
|
|
Colon-separated username:password string for 'authorization: basic ...'
|
|
|
|
auth header.
|
|
|
|
|
|
|
|
:param proxy_basic_auth:
|
|
|
|
Colon-separated username:password string for 'proxy-authorization: basic ...'
|
|
|
|
auth header.
|
|
|
|
|
|
|
|
:param disable_cache:
|
|
|
|
If ``True``, adds 'cache-control: no-cache' header.
|
|
|
|
|
|
|
|
Example::
|
|
|
|
|
|
|
|
>>> make_headers(keep_alive=True, user_agent="Batman/1.0")
|
|
|
|
{'connection': 'keep-alive', 'user-agent': 'Batman/1.0'}
|
|
|
|
>>> make_headers(accept_encoding=True)
|
|
|
|
{'accept-encoding': 'gzip,deflate'}
|
|
|
|
"""
|
|
|
|
headers = {}
|
|
|
|
if accept_encoding:
|
|
|
|
if isinstance(accept_encoding, str):
|
|
|
|
pass
|
|
|
|
elif isinstance(accept_encoding, list):
|
|
|
|
accept_encoding = ','.join(accept_encoding)
|
|
|
|
else:
|
|
|
|
accept_encoding = ACCEPT_ENCODING
|
|
|
|
headers['accept-encoding'] = accept_encoding
|
|
|
|
|
|
|
|
if user_agent:
|
|
|
|
headers['user-agent'] = user_agent
|
|
|
|
|
|
|
|
if keep_alive:
|
|
|
|
headers['connection'] = 'keep-alive'
|
|
|
|
|
|
|
|
if basic_auth:
|
|
|
|
headers['authorization'] = 'Basic ' + \
|
|
|
|
b64encode(b(basic_auth)).decode('utf-8')
|
|
|
|
|
|
|
|
if proxy_basic_auth:
|
|
|
|
headers['proxy-authorization'] = 'Basic ' + \
|
|
|
|
b64encode(b(proxy_basic_auth)).decode('utf-8')
|
|
|
|
|
|
|
|
if disable_cache:
|
|
|
|
headers['cache-control'] = 'no-cache'
|
|
|
|
|
|
|
|
return headers
|
2017-02-21 00:22:21 +00:00
|
|
|
|
|
|
|
|
|
|
|
def set_file_position(body, pos):
|
|
|
|
"""
|
|
|
|
If a position is provided, move file to that point.
|
|
|
|
Otherwise, we'll attempt to record a position for future use.
|
|
|
|
"""
|
|
|
|
if pos is not None:
|
|
|
|
rewind_body(body, pos)
|
|
|
|
elif getattr(body, 'tell', None) is not None:
|
|
|
|
try:
|
|
|
|
pos = body.tell()
|
|
|
|
except (IOError, OSError):
|
|
|
|
# This differentiates from None, allowing us to catch
|
|
|
|
# a failed `tell()` later when trying to rewind the body.
|
|
|
|
pos = _FAILEDTELL
|
|
|
|
|
|
|
|
return pos
|
|
|
|
|
|
|
|
|
|
|
|
def rewind_body(body, body_pos):
|
|
|
|
"""
|
|
|
|
Attempt to rewind body to a certain position.
|
|
|
|
Primarily used for request redirects and retries.
|
|
|
|
|
|
|
|
:param body:
|
|
|
|
File-like object that supports seek.
|
|
|
|
|
|
|
|
:param int pos:
|
|
|
|
Position to seek to in file.
|
|
|
|
"""
|
|
|
|
body_seek = getattr(body, 'seek', None)
|
|
|
|
if body_seek is not None and isinstance(body_pos, integer_types):
|
|
|
|
try:
|
|
|
|
body_seek(body_pos)
|
|
|
|
except (IOError, OSError):
|
2017-10-29 19:49:14 +00:00
|
|
|
raise UnrewindableBodyError("An error occurred when rewinding request "
|
2017-02-21 00:22:21 +00:00
|
|
|
"body for redirect/retry.")
|
|
|
|
elif body_pos is _FAILEDTELL:
|
|
|
|
raise UnrewindableBodyError("Unable to record file position for rewinding "
|
|
|
|
"request body during a redirect/retry.")
|
|
|
|
else:
|
|
|
|
raise ValueError("body_pos must be of type integer, "
|
|
|
|
"instead it was %s." % type(body_pos))
|