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annotate lib/python3.8/site-packages/pip/_vendor/urllib3/request.py @ 0:9e54283cc701 draft

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"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -0400
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1 from __future__ import absolute_import
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2
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3 from .filepost import encode_multipart_formdata
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4 from .packages.six.moves.urllib.parse import urlencode
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5
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6
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7 __all__ = ["RequestMethods"]
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8
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9
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10 class RequestMethods(object):
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11 """
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12 Convenience mixin for classes who implement a :meth:`urlopen` method, such
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13 as :class:`~urllib3.connectionpool.HTTPConnectionPool` and
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14 :class:`~urllib3.poolmanager.PoolManager`.
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15
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16 Provides behavior for making common types of HTTP request methods and
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17 decides which type of request field encoding to use.
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18
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19 Specifically,
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20
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21 :meth:`.request_encode_url` is for sending requests whose fields are
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22 encoded in the URL (such as GET, HEAD, DELETE).
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23
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24 :meth:`.request_encode_body` is for sending requests whose fields are
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25 encoded in the *body* of the request using multipart or www-form-urlencoded
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26 (such as for POST, PUT, PATCH).
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27
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28 :meth:`.request` is for making any kind of request, it will look up the
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29 appropriate encoding format and use one of the above two methods to make
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30 the request.
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31
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32 Initializer parameters:
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33
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34 :param headers:
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35 Headers to include with all requests, unless other headers are given
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36 explicitly.
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37 """
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38
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39 _encode_url_methods = {"DELETE", "GET", "HEAD", "OPTIONS"}
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40
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41 def __init__(self, headers=None):
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42 self.headers = headers or {}
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43
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44 def urlopen(
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45 self,
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46 method,
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47 url,
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48 body=None,
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49 headers=None,
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50 encode_multipart=True,
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51 multipart_boundary=None,
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52 **kw
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53 ): # Abstract
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54 raise NotImplementedError(
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55 "Classes extending RequestMethods must implement "
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56 "their own ``urlopen`` method."
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57 )
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58
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59 def request(self, method, url, fields=None, headers=None, **urlopen_kw):
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60 """
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61 Make a request using :meth:`urlopen` with the appropriate encoding of
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62 ``fields`` based on the ``method`` used.
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63
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64 This is a convenience method that requires the least amount of manual
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65 effort. It can be used in most situations, while still having the
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66 option to drop down to more specific methods when necessary, such as
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67 :meth:`request_encode_url`, :meth:`request_encode_body`,
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68 or even the lowest level :meth:`urlopen`.
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69 """
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70 method = method.upper()
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71
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72 urlopen_kw["request_url"] = url
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73
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74 if method in self._encode_url_methods:
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75 return self.request_encode_url(
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76 method, url, fields=fields, headers=headers, **urlopen_kw
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77 )
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78 else:
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79 return self.request_encode_body(
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80 method, url, fields=fields, headers=headers, **urlopen_kw
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81 )
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82
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83 def request_encode_url(self, method, url, fields=None, headers=None, **urlopen_kw):
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84 """
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85 Make a request using :meth:`urlopen` with the ``fields`` encoded in
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86 the url. This is useful for request methods like GET, HEAD, DELETE, etc.
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87 """
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88 if headers is None:
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89 headers = self.headers
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90
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91 extra_kw = {"headers": headers}
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92 extra_kw.update(urlopen_kw)
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93
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94 if fields:
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95 url += "?" + urlencode(fields)
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96
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97 return self.urlopen(method, url, **extra_kw)
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98
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99 def request_encode_body(
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100 self,
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101 method,
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102 url,
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103 fields=None,
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104 headers=None,
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105 encode_multipart=True,
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106 multipart_boundary=None,
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107 **urlopen_kw
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108 ):
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109 """
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110 Make a request using :meth:`urlopen` with the ``fields`` encoded in
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111 the body. This is useful for request methods like POST, PUT, PATCH, etc.
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112
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113 When ``encode_multipart=True`` (default), then
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114 :meth:`urllib3.filepost.encode_multipart_formdata` is used to encode
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115 the payload with the appropriate content type. Otherwise
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116 :meth:`urllib.urlencode` is used with the
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117 'application/x-www-form-urlencoded' content type.
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118
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119 Multipart encoding must be used when posting files, and it's reasonably
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120 safe to use it in other times too. However, it may break request
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121 signing, such as with OAuth.
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122
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123 Supports an optional ``fields`` parameter of key/value strings AND
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124 key/filetuple. A filetuple is a (filename, data, MIME type) tuple where
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125 the MIME type is optional. For example::
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126
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127 fields = {
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128 'foo': 'bar',
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129 'fakefile': ('foofile.txt', 'contents of foofile'),
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130 'realfile': ('barfile.txt', open('realfile').read()),
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131 'typedfile': ('bazfile.bin', open('bazfile').read(),
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132 'image/jpeg'),
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133 'nonamefile': 'contents of nonamefile field',
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134 }
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135
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136 When uploading a file, providing a filename (the first parameter of the
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137 tuple) is optional but recommended to best mimic behavior of browsers.
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138
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139 Note that if ``headers`` are supplied, the 'Content-Type' header will
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140 be overwritten because it depends on the dynamic random boundary string
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141 which is used to compose the body of the request. The random boundary
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142 string can be explicitly set with the ``multipart_boundary`` parameter.
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143 """
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144 if headers is None:
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145 headers = self.headers
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146
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147 extra_kw = {"headers": {}}
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148
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149 if fields:
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150 if "body" in urlopen_kw:
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151 raise TypeError(
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152 "request got values for both 'fields' and 'body', can only specify one."
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153 )
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154
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155 if encode_multipart:
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156 body, content_type = encode_multipart_formdata(
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157 fields, boundary=multipart_boundary
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158 )
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159 else:
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160 body, content_type = (
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161 urlencode(fields),
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162 "application/x-www-form-urlencoded",
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163 )
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164
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165 extra_kw["body"] = body
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166 extra_kw["headers"] = {"Content-Type": content_type}
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167
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168 extra_kw["headers"].update(headers)
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169 extra_kw.update(urlopen_kw)
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170
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171 return self.urlopen(method, url, **extra_kw)