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Issue 69143004: Delete swarm_client. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/tools/
Patch Set: Created 7 years, 1 month ago
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1 # urllib3/request.py
2 # Copyright 2008-2013 Andrey Petrov and contributors (see CONTRIBUTORS.txt)
3 #
4 # This module is part of urllib3 and is released under
5 # the MIT License: http://www.opensource.org/licenses/mit-license.php
6
7 try:
8 from urllib.parse import urlencode
9 except ImportError:
10 from urllib import urlencode
11
12 from .filepost import encode_multipart_formdata
13
14
15 __all__ = ['RequestMethods']
16
17
18 class RequestMethods(object):
19 """
20 Convenience mixin for classes who implement a :meth:`urlopen` method, such
21 as :class:`~urllib3.connectionpool.HTTPConnectionPool` and
22 :class:`~urllib3.poolmanager.PoolManager`.
23
24 Provides behavior for making common types of HTTP request methods and
25 decides which type of request field encoding to use.
26
27 Specifically,
28
29 :meth:`.request_encode_url` is for sending requests whose fields are encoded
30 in the URL (such as GET, HEAD, DELETE).
31
32 :meth:`.request_encode_body` is for sending requests whose fields are
33 encoded in the *body* of the request using multipart or www-form-urlencoded
34 (such as for POST, PUT, PATCH).
35
36 :meth:`.request` is for making any kind of request, it will look up the
37 appropriate encoding format and use one of the above two methods to make
38 the request.
39
40 Initializer parameters:
41
42 :param headers:
43 Headers to include with all requests, unless other headers are given
44 explicitly.
45 """
46
47 _encode_url_methods = set(['DELETE', 'GET', 'HEAD', 'OPTIONS'])
48 _encode_body_methods = set(['PATCH', 'POST', 'PUT', 'TRACE'])
49
50 def __init__(self, headers=None):
51 self.headers = headers or {}
52
53 def urlopen(self, method, url, body=None, headers=None,
54 encode_multipart=True, multipart_boundary=None,
55 **kw): # Abstract
56 raise NotImplemented("Classes extending RequestMethods must implement "
57 "their own ``urlopen`` method.")
58
59 def request(self, method, url, fields=None, headers=None, **urlopen_kw):
60 """
61 Make a request using :meth:`urlopen` with the appropriate encoding of
62 ``fields`` based on the ``method`` used.
63
64 This is a convenience method that requires the least amount of manual
65 effort. It can be used in most situations, while still having the option
66 to drop down to more specific methods when necessary, such as
67 :meth:`request_encode_url`, :meth:`request_encode_body`,
68 or even the lowest level :meth:`urlopen`.
69 """
70 method = method.upper()
71
72 if method in self._encode_url_methods:
73 return self.request_encode_url(method, url, fields=fields,
74 headers=headers,
75 **urlopen_kw)
76 else:
77 return self.request_encode_body(method, url, fields=fields,
78 headers=headers,
79 **urlopen_kw)
80
81 def request_encode_url(self, method, url, fields=None, **urlopen_kw):
82 """
83 Make a request using :meth:`urlopen` with the ``fields`` encoded in
84 the url. This is useful for request methods like GET, HEAD, DELETE, etc.
85 """
86 if fields:
87 url += '?' + urlencode(fields)
88 return self.urlopen(method, url, **urlopen_kw)
89
90 def request_encode_body(self, method, url, fields=None, headers=None,
91 encode_multipart=True, multipart_boundary=None,
92 **urlopen_kw):
93 """
94 Make a request using :meth:`urlopen` with the ``fields`` encoded in
95 the body. This is useful for request methods like POST, PUT, PATCH, etc.
96
97 When ``encode_multipart=True`` (default), then
98 :meth:`urllib3.filepost.encode_multipart_formdata` is used to encode the
99 payload with the appropriate content type. Otherwise
100 :meth:`urllib.urlencode` is used with the
101 'application/x-www-form-urlencoded' content type.
102
103 Multipart encoding must be used when posting files, and it's reasonably
104 safe to use it in other times too. However, it may break request signing ,
105 such as with OAuth.
106
107 Supports an optional ``fields`` parameter of key/value strings AND
108 key/filetuple. A filetuple is a (filename, data, MIME type) tuple where
109 the MIME type is optional. For example: ::
110
111 fields = {
112 'foo': 'bar',
113 'fakefile': ('foofile.txt', 'contents of foofile'),
114 'realfile': ('barfile.txt', open('realfile').read()),
115 'typedfile': ('bazfile.bin', open('bazfile').read(),
116 'image/jpeg'),
117 'nonamefile': 'contents of nonamefile field',
118 }
119
120 When uploading a file, providing a filename (the first parameter of the
121 tuple) is optional but recommended to best mimick behavior of browsers.
122
123 Note that if ``headers`` are supplied, the 'Content-Type' header will be
124 overwritten because it depends on the dynamic random boundary string
125 which is used to compose the body of the request. The random boundary
126 string can be explicitly set with the ``multipart_boundary`` parameter.
127 """
128 if encode_multipart:
129 body, content_type = encode_multipart_formdata(fields or {},
130 boundary=multipart_boundary)
131 else:
132 body, content_type = (urlencode(fields or {}),
133 'application/x-www-form-urlencoded')
134
135 if headers is None:
136 headers = self.headers
137
138 headers_ = {'Content-Type': content_type}
139 headers_.update(headers)
140
141 return self.urlopen(method, url, body=body, headers=headers_,
142 **urlopen_kw)
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