Add 'requests' library to third_party.

third_party/requests/packages/urllib3/request.py

+# urllib3/request.py
+# Copyright 2008-2013 Andrey Petrov and contributors (see CONTRIBUTORS.txt)
+#
+# This module is part of urllib3 and is released under
+# the MIT License: http://www.opensource.org/licenses/mit-license.php
+
+try:
+    from urllib.parse import urlencode
+except ImportError:
+    from urllib import urlencode
+
+from .filepost import encode_multipart_formdata
+
+
+__all__ = ['RequestMethods']
+
+
+class RequestMethods(object):
+    """
+    Convenience mixin for classes who implement a :meth:`urlopen` method, such
+    as :class:`~urllib3.connectionpool.HTTPConnectionPool` and
+    :class:`~urllib3.poolmanager.PoolManager`.
+
+    Provides behavior for making common types of HTTP request methods and
+    decides which type of request field encoding to use.
+
+    Specifically,
+
+    :meth:`.request_encode_url` is for sending requests whose fields are encoded
+    in the URL (such as GET, HEAD, DELETE).
+
+    :meth:`.request_encode_body` is for sending requests whose fields are
+    encoded in the *body* of the request using multipart or www-orm-urlencoded
+    (such as for POST, PUT, PATCH).
+
+    :meth:`.request` is for making any kind of request, it will look up the
+    appropriate encoding format and use one of the above two methods to make
+    the request.
+
+    Initializer parameters:
+
+    :param headers:
+        Headers to include with all requests, unless other headers are given
+        explicitly.
+    """
+
+    _encode_url_methods = set(['DELETE', 'GET', 'HEAD', 'OPTIONS'])
+    _encode_body_methods = set(['PATCH', 'POST', 'PUT', 'TRACE'])
+
+    def __init__(self, headers=None):
+        self.headers = headers or {}
+
+    def urlopen(self, method, url, body=None, headers=None,
+                encode_multipart=True, multipart_boundary=None,
+                **kw): # Abstract
+        raise NotImplemented("Classes extending RequestMethods must implement "
+                             "their own ``urlopen`` method.")
+
+    def request(self, method, url, fields=None, headers=None, **urlopen_kw):
+        """
+        Make a request using :meth:`urlopen` with the appropriate encoding of
+        ``fields`` based on the ``method`` used.
+
+        This is a convenience method that requires the least amount of manual
+        effort. It can be used in most situations, while still having the option
+        to drop down to more specific methods when necessary, such as
+        :meth:`request_encode_url`, :meth:`request_encode_body`,
+        or even the lowest level :meth:`urlopen`.
+        """
+        method = method.upper()
+
+        if method in self._encode_url_methods:
+            return self.request_encode_url(method, url, fields=fields,
+                                            headers=headers,
+                                            **urlopen_kw)
+        else:
+            return self.request_encode_body(method, url, fields=fields,
+                                             headers=headers,
+                                             **urlopen_kw)
+
+    def request_encode_url(self, method, url, fields=None, **urlopen_kw):
+        """
+        Make a request using :meth:`urlopen` with the ``fields`` encoded in
+        the url. This is useful for request methods like GET, HEAD, DELETE, etc.
+        """
+        if fields:
+            url += '?' + urlencode(fields)
+        return self.urlopen(method, url, **urlopen_kw)
+
+    def request_encode_body(self, method, url, fields=None, headers=None,
+                            encode_multipart=True, multipart_boundary=None,
+                            **urlopen_kw):
+        """
+        Make a request using :meth:`urlopen` with the ``fields`` encoded in
+        the body. This is useful for request methods like POST, PUT, PATCH, etc.
+
+        When ``encode_multipart=True`` (default), then
+        :meth:`urllib3.filepost.encode_multipart_formdata` is used to encode the
+        payload with the appropriate content type. Otherwise
+        :meth:`urllib.urlencode` is used with the
+        'application/x-www-form-urlencoded' content type.
+
+        Multipart encoding must be used when posting files, and it's reasonably
+        safe to use it in other times too. However, it may break request signing,
+        such as with OAuth.
+
+        Supports an optional ``fields`` parameter of key/value strings AND
+        key/filetuple. A filetuple is a (filename, data, MIME type) tuple where
+        the MIME type is optional. For example: ::
+
+            fields = {
+                'foo': 'bar',
+                'fakefile': ('foofile.txt', 'contents of foofile'),
+                'realfile': ('barfile.txt', open('realfile').read()),
+                'typedfile': ('bazfile.bin', open('bazfile').read(),
+                              'image/jpeg'),
+                'nonamefile': 'contents of nonamefile field',
+            }
+
+        When uploading a file, providing a filename (the first parameter of the
+        tuple) is optional but recommended to best mimick behavior of browsers.
+
+        Note that if ``headers`` are supplied, the 'Content-Type' header will be
+        overwritten because it depends on the dynamic random boundary string
+        which is used to compose the body of the request. The random boundary
+        string can be explicitly set with the ``multipart_boundary`` parameter.
+        """
+        if encode_multipart:
+            body, content_type = encode_multipart_formdata(fields or {},
+                                    boundary=multipart_boundary)
+        else:
+            body, content_type = (urlencode(fields or {}),
+                                    'application/x-www-form-urlencoded')
+
+        if headers is None:
+            headers = self.headers
+
+        headers_ = {'Content-Type': content_type}
+        headers_.update(headers)
+
+        return self.urlopen(method, url, body=body, headers=headers_,
+                            **urlopen_kw)