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325 lines
9.6 KiB
325 lines
9.6 KiB
"""Private module full of compatibility hacks.
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Primarily this is for downstream redistributions of requests that unvendor
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urllib3 without providing a shim.
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.. warning::
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This module is private. If you use it, and something breaks, you were
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warned
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"""
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import sys
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import requests
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try:
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from requests.packages.urllib3 import fields
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from requests.packages.urllib3 import filepost
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from requests.packages.urllib3 import poolmanager
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except ImportError:
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from urllib3 import fields
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from urllib3 import filepost
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from urllib3 import poolmanager
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try:
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from requests.packages.urllib3.connection import HTTPConnection
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from requests.packages.urllib3 import connection
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except ImportError:
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try:
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from urllib3.connection import HTTPConnection
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from urllib3 import connection
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except ImportError:
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HTTPConnection = None
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connection = None
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if requests.__build__ < 0x020300:
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timeout = None
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else:
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try:
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from requests.packages.urllib3.util import timeout
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except ImportError:
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from urllib3.util import timeout
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if requests.__build__ < 0x021000:
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gaecontrib = None
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else:
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try:
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from requests.packages.urllib3.contrib import appengine as gaecontrib
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except ImportError:
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from urllib3.contrib import appengine as gaecontrib
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if requests.__build__ < 0x021200:
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PyOpenSSLContext = None
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else:
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try:
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from requests.packages.urllib3.contrib.pyopenssl \
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import PyOpenSSLContext
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except ImportError:
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try:
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from urllib3.contrib.pyopenssl import PyOpenSSLContext
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except ImportError:
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PyOpenSSLContext = None
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PY3 = sys.version_info > (3, 0)
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if PY3:
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from collections.abc import Mapping, MutableMapping
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import queue
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from urllib.parse import urlencode, urljoin
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else:
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from collections import Mapping, MutableMapping
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import Queue as queue
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from urllib import urlencode
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from urlparse import urljoin
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try:
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basestring = basestring
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except NameError:
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basestring = (str, bytes)
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class HTTPHeaderDict(MutableMapping):
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"""
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:param headers:
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An iterable of field-value pairs. Must not contain multiple field names
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when compared case-insensitively.
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:param kwargs:
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Additional field-value pairs to pass in to ``dict.update``.
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A ``dict`` like container for storing HTTP Headers.
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Field names are stored and compared case-insensitively in compliance with
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RFC 7230. Iteration provides the first case-sensitive key seen for each
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case-insensitive pair.
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Using ``__setitem__`` syntax overwrites fields that compare equal
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case-insensitively in order to maintain ``dict``'s api. For fields that
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compare equal, instead create a new ``HTTPHeaderDict`` and use ``.add``
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in a loop.
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If multiple fields that are equal case-insensitively are passed to the
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constructor or ``.update``, the behavior is undefined and some will be
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lost.
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>>> headers = HTTPHeaderDict()
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>>> headers.add('Set-Cookie', 'foo=bar')
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>>> headers.add('set-cookie', 'baz=quxx')
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>>> headers['content-length'] = '7'
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>>> headers['SET-cookie']
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'foo=bar, baz=quxx'
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>>> headers['Content-Length']
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'7'
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"""
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def __init__(self, headers=None, **kwargs):
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super(HTTPHeaderDict, self).__init__()
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self._container = {}
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if headers is not None:
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if isinstance(headers, HTTPHeaderDict):
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self._copy_from(headers)
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else:
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self.extend(headers)
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if kwargs:
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self.extend(kwargs)
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def __setitem__(self, key, val):
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self._container[key.lower()] = (key, val)
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return self._container[key.lower()]
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def __getitem__(self, key):
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val = self._container[key.lower()]
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return ', '.join(val[1:])
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def __delitem__(self, key):
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del self._container[key.lower()]
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def __contains__(self, key):
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return key.lower() in self._container
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def __eq__(self, other):
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if not isinstance(other, Mapping) and not hasattr(other, 'keys'):
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return False
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if not isinstance(other, type(self)):
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other = type(self)(other)
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return ({k.lower(): v for k, v in self.itermerged()} ==
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{k.lower(): v for k, v in other.itermerged()})
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def __ne__(self, other):
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return not self.__eq__(other)
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if not PY3: # Python 2
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iterkeys = MutableMapping.iterkeys
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itervalues = MutableMapping.itervalues
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__marker = object()
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def __len__(self):
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return len(self._container)
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def __iter__(self):
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# Only provide the originally cased names
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for vals in self._container.values():
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yield vals[0]
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def pop(self, key, default=__marker):
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"""D.pop(k[,d]) -> v, remove specified key and return its value.
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If key is not found, d is returned if given, otherwise KeyError is
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raised.
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"""
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# Using the MutableMapping function directly fails due to the private
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# marker.
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# Using ordinary dict.pop would expose the internal structures.
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# So let's reinvent the wheel.
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try:
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value = self[key]
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except KeyError:
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if default is self.__marker:
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raise
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return default
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else:
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del self[key]
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return value
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def discard(self, key):
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try:
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del self[key]
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except KeyError:
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pass
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def add(self, key, val):
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"""Adds a (name, value) pair, doesn't overwrite the value if it already
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exists.
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>>> headers = HTTPHeaderDict(foo='bar')
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>>> headers.add('Foo', 'baz')
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>>> headers['foo']
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'bar, baz'
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"""
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key_lower = key.lower()
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new_vals = key, val
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# Keep the common case aka no item present as fast as possible
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vals = self._container.setdefault(key_lower, new_vals)
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if new_vals is not vals:
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# new_vals was not inserted, as there was a previous one
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if isinstance(vals, list):
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# If already several items got inserted, we have a list
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vals.append(val)
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else:
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# vals should be a tuple then, i.e. only one item so far
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# Need to convert the tuple to list for further extension
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self._container[key_lower] = [vals[0], vals[1], val]
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def extend(self, *args, **kwargs):
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"""Generic import function for any type of header-like object.
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Adapted version of MutableMapping.update in order to insert items
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with self.add instead of self.__setitem__
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"""
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if len(args) > 1:
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raise TypeError("extend() takes at most 1 positional "
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"arguments ({} given)".format(len(args)))
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other = args[0] if len(args) >= 1 else ()
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if isinstance(other, HTTPHeaderDict):
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for key, val in other.iteritems():
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self.add(key, val)
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elif isinstance(other, Mapping):
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for key in other:
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self.add(key, other[key])
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elif hasattr(other, "keys"):
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for key in other.keys():
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self.add(key, other[key])
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else:
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for key, value in other:
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self.add(key, value)
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for key, value in kwargs.items():
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self.add(key, value)
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def getlist(self, key):
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"""Returns a list of all the values for the named field. Returns an
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empty list if the key doesn't exist."""
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try:
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vals = self._container[key.lower()]
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except KeyError:
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return []
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else:
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if isinstance(vals, tuple):
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return [vals[1]]
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else:
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return vals[1:]
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# Backwards compatibility for httplib
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getheaders = getlist
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getallmatchingheaders = getlist
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iget = getlist
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def __repr__(self):
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return "%s(%s)" % (type(self).__name__, dict(self.itermerged()))
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def _copy_from(self, other):
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for key in other:
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val = other.getlist(key)
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if isinstance(val, list):
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# Don't need to convert tuples
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val = list(val)
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self._container[key.lower()] = [key] + val
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def copy(self):
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clone = type(self)()
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clone._copy_from(self)
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return clone
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def iteritems(self):
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"""Iterate over all header lines, including duplicate ones."""
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for key in self:
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vals = self._container[key.lower()]
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for val in vals[1:]:
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yield vals[0], val
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def itermerged(self):
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"""Iterate over all headers, merging duplicate ones together."""
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for key in self:
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val = self._container[key.lower()]
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yield val[0], ', '.join(val[1:])
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def items(self):
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return list(self.iteritems())
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@classmethod
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def from_httplib(cls, message): # Python 2
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"""Read headers from a Python 2 httplib message object."""
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# python2.7 does not expose a proper API for exporting multiheaders
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# efficiently. This function re-reads raw lines from the message
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# object and extracts the multiheaders properly.
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headers = []
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for line in message.headers:
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if line.startswith((' ', '\t')):
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key, value = headers[-1]
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headers[-1] = (key, value + '\r\n' + line.rstrip())
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continue
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key, value = line.split(':', 1)
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headers.append((key, value.strip()))
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return cls(headers)
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__all__ = (
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'basestring',
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'connection',
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'fields',
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'filepost',
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'poolmanager',
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'timeout',
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'HTTPHeaderDict',
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'queue',
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'urlencode',
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'gaecontrib',
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'urljoin',
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'PyOpenSSLContext',
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)
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