Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/requests/auth.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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1 # -*- coding: utf-8 -*-
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2
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3 """
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4 requests.auth
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5 ~~~~~~~~~~~~~
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6
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7 This module contains the authentication handlers for Requests.
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8 """
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9
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10 import os
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11 import re
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12 import time
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13 import hashlib
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14 import threading
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15 import warnings
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16
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17 from base64 import b64encode
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18
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19 from .compat import urlparse, str, basestring
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20 from .cookies import extract_cookies_to_jar
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21 from ._internal_utils import to_native_string
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22 from .utils import parse_dict_header
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23
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24 CONTENT_TYPE_FORM_URLENCODED = 'application/x-www-form-urlencoded'
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25 CONTENT_TYPE_MULTI_PART = 'multipart/form-data'
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26
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27
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28 def _basic_auth_str(username, password):
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29 """Returns a Basic Auth string."""
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30
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31 # "I want us to put a big-ol' comment on top of it that
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32 # says that this behaviour is dumb but we need to preserve
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33 # it because people are relying on it."
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34 # - Lukasa
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35 #
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36 # These are here solely to maintain backwards compatibility
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37 # for things like ints. This will be removed in 3.0.0.
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38 if not isinstance(username, basestring):
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39 warnings.warn(
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40 "Non-string usernames will no longer be supported in Requests "
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41 "3.0.0. Please convert the object you've passed in ({!r}) to "
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42 "a string or bytes object in the near future to avoid "
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43 "problems.".format(username),
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44 category=DeprecationWarning,
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45 )
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46 username = str(username)
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47
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48 if not isinstance(password, basestring):
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49 warnings.warn(
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50 "Non-string passwords will no longer be supported in Requests "
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51 "3.0.0. Please convert the object you've passed in ({!r}) to "
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52 "a string or bytes object in the near future to avoid "
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53 "problems.".format(type(password)),
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54 category=DeprecationWarning,
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55 )
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56 password = str(password)
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57 # -- End Removal --
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58
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59 if isinstance(username, str):
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60 username = username.encode('latin1')
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61
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62 if isinstance(password, str):
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63 password = password.encode('latin1')
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64
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65 authstr = 'Basic ' + to_native_string(
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66 b64encode(b':'.join((username, password))).strip()
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67 )
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68
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69 return authstr
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70
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71
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72 class AuthBase(object):
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73 """Base class that all auth implementations derive from"""
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74
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75 def __call__(self, r):
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76 raise NotImplementedError('Auth hooks must be callable.')
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77
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78
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79 class HTTPBasicAuth(AuthBase):
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80 """Attaches HTTP Basic Authentication to the given Request object."""
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81
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82 def __init__(self, username, password):
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83 self.username = username
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84 self.password = password
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85
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86 def __eq__(self, other):
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87 return all([
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88 self.username == getattr(other, 'username', None),
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89 self.password == getattr(other, 'password', None)
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90 ])
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91
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92 def __ne__(self, other):
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93 return not self == other
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94
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95 def __call__(self, r):
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96 r.headers['Authorization'] = _basic_auth_str(self.username, self.password)
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97 return r
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98
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99
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100 class HTTPProxyAuth(HTTPBasicAuth):
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101 """Attaches HTTP Proxy Authentication to a given Request object."""
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102
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103 def __call__(self, r):
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104 r.headers['Proxy-Authorization'] = _basic_auth_str(self.username, self.password)
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105 return r
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106
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107
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108 class HTTPDigestAuth(AuthBase):
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109 """Attaches HTTP Digest Authentication to the given Request object."""
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110
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111 def __init__(self, username, password):
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112 self.username = username
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113 self.password = password
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114 # Keep state in per-thread local storage
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115 self._thread_local = threading.local()
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116
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117 def init_per_thread_state(self):
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118 # Ensure state is initialized just once per-thread
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119 if not hasattr(self._thread_local, 'init'):
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120 self._thread_local.init = True
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121 self._thread_local.last_nonce = ''
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122 self._thread_local.nonce_count = 0
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123 self._thread_local.chal = {}
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124 self._thread_local.pos = None
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125 self._thread_local.num_401_calls = None
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126
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127 def build_digest_header(self, method, url):
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128 """
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129 :rtype: str
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130 """
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131
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132 realm = self._thread_local.chal['realm']
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133 nonce = self._thread_local.chal['nonce']
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134 qop = self._thread_local.chal.get('qop')
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135 algorithm = self._thread_local.chal.get('algorithm')
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136 opaque = self._thread_local.chal.get('opaque')
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137 hash_utf8 = None
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138
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139 if algorithm is None:
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140 _algorithm = 'MD5'
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141 else:
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142 _algorithm = algorithm.upper()
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143 # lambdas assume digest modules are imported at the top level
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144 if _algorithm == 'MD5' or _algorithm == 'MD5-SESS':
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145 def md5_utf8(x):
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146 if isinstance(x, str):
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147 x = x.encode('utf-8')
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148 return hashlib.md5(x).hexdigest()
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149 hash_utf8 = md5_utf8
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150 elif _algorithm == 'SHA':
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151 def sha_utf8(x):
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152 if isinstance(x, str):
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153 x = x.encode('utf-8')
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154 return hashlib.sha1(x).hexdigest()
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155 hash_utf8 = sha_utf8
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156 elif _algorithm == 'SHA-256':
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157 def sha256_utf8(x):
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158 if isinstance(x, str):
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159 x = x.encode('utf-8')
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160 return hashlib.sha256(x).hexdigest()
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161 hash_utf8 = sha256_utf8
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162 elif _algorithm == 'SHA-512':
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163 def sha512_utf8(x):
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164 if isinstance(x, str):
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165 x = x.encode('utf-8')
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166 return hashlib.sha512(x).hexdigest()
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167 hash_utf8 = sha512_utf8
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168
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169 KD = lambda s, d: hash_utf8("%s:%s" % (s, d))
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170
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171 if hash_utf8 is None:
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172 return None
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173
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174 # XXX not implemented yet
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175 entdig = None
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176 p_parsed = urlparse(url)
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177 #: path is request-uri defined in RFC 2616 which should not be empty
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178 path = p_parsed.path or "/"
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179 if p_parsed.query:
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180 path += '?' + p_parsed.query
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181
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182 A1 = '%s:%s:%s' % (self.username, realm, self.password)
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183 A2 = '%s:%s' % (method, path)
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184
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185 HA1 = hash_utf8(A1)
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186 HA2 = hash_utf8(A2)
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187
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188 if nonce == self._thread_local.last_nonce:
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189 self._thread_local.nonce_count += 1
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190 else:
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191 self._thread_local.nonce_count = 1
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192 ncvalue = '%08x' % self._thread_local.nonce_count
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193 s = str(self._thread_local.nonce_count).encode('utf-8')
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194 s += nonce.encode('utf-8')
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195 s += time.ctime().encode('utf-8')
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196 s += os.urandom(8)
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197
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198 cnonce = (hashlib.sha1(s).hexdigest()[:16])
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199 if _algorithm == 'MD5-SESS':
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200 HA1 = hash_utf8('%s:%s:%s' % (HA1, nonce, cnonce))
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201
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202 if not qop:
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203 respdig = KD(HA1, "%s:%s" % (nonce, HA2))
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204 elif qop == 'auth' or 'auth' in qop.split(','):
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205 noncebit = "%s:%s:%s:%s:%s" % (
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206 nonce, ncvalue, cnonce, 'auth', HA2
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207 )
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208 respdig = KD(HA1, noncebit)
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209 else:
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210 # XXX handle auth-int.
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211 return None
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212
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213 self._thread_local.last_nonce = nonce
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214
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215 # XXX should the partial digests be encoded too?
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216 base = 'username="%s", realm="%s", nonce="%s", uri="%s", ' \
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217 'response="%s"' % (self.username, realm, nonce, path, respdig)
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218 if opaque:
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219 base += ', opaque="%s"' % opaque
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220 if algorithm:
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221 base += ', algorithm="%s"' % algorithm
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222 if entdig:
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223 base += ', digest="%s"' % entdig
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224 if qop:
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225 base += ', qop="auth", nc=%s, cnonce="%s"' % (ncvalue, cnonce)
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226
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227 return 'Digest %s' % (base)
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228
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229 def handle_redirect(self, r, **kwargs):
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230 """Reset num_401_calls counter on redirects."""
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231 if r.is_redirect:
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232 self._thread_local.num_401_calls = 1
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233
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234 def handle_401(self, r, **kwargs):
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235 """
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236 Takes the given response and tries digest-auth, if needed.
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237
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238 :rtype: requests.Response
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239 """
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240
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241 # If response is not 4xx, do not auth
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242 # See https://github.com/psf/requests/issues/3772
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243 if not 400 <= r.status_code < 500:
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244 self._thread_local.num_401_calls = 1
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245 return r
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246
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247 if self._thread_local.pos is not None:
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248 # Rewind the file position indicator of the body to where
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249 # it was to resend the request.
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250 r.request.body.seek(self._thread_local.pos)
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251 s_auth = r.headers.get('www-authenticate', '')
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252
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253 if 'digest' in s_auth.lower() and self._thread_local.num_401_calls < 2:
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254
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255 self._thread_local.num_401_calls += 1
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256 pat = re.compile(r'digest ', flags=re.IGNORECASE)
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257 self._thread_local.chal = parse_dict_header(pat.sub('', s_auth, count=1))
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258
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259 # Consume content and release the original connection
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260 # to allow our new request to reuse the same one.
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261 r.content
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262 r.close()
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263 prep = r.request.copy()
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264 extract_cookies_to_jar(prep._cookies, r.request, r.raw)
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265 prep.prepare_cookies(prep._cookies)
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266
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267 prep.headers['Authorization'] = self.build_digest_header(
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268 prep.method, prep.url)
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269 _r = r.connection.send(prep, **kwargs)
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270 _r.history.append(r)
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271 _r.request = prep
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272
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273 return _r
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274
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275 self._thread_local.num_401_calls = 1
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276 return r
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277
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278 def __call__(self, r):
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279 # Initialize per-thread state, if needed
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280 self.init_per_thread_state()
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281 # If we have a saved nonce, skip the 401
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282 if self._thread_local.last_nonce:
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283 r.headers['Authorization'] = self.build_digest_header(r.method, r.url)
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284 try:
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285 self._thread_local.pos = r.body.tell()
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286 except AttributeError:
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287 # In the case of HTTPDigestAuth being reused and the body of
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288 # the previous request was a file-like object, pos has the
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289 # file position of the previous body. Ensure it's set to
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290 # None.
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291 self._thread_local.pos = None
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292 r.register_hook('response', self.handle_401)
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293 r.register_hook('response', self.handle_redirect)
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294 self._thread_local.num_401_calls = 1
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295
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296 return r
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297
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298 def __eq__(self, other):
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299 return all([
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300 self.username == getattr(other, 'username', None),
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301 self.password == getattr(other, 'password', None)
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302 ])
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303
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304 def __ne__(self, other):
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305 return not self == other