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annotate planemo/lib/python3.7/site-packages/urllib3/connection.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 from __future__ import absolute_import
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2 import re
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3 import datetime
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4 import logging
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5 import os
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6 import socket
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7 from socket import error as SocketError, timeout as SocketTimeout
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8 import warnings
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9 from .packages import six
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10 from .packages.six.moves.http_client import HTTPConnection as _HTTPConnection
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11 from .packages.six.moves.http_client import HTTPException # noqa: F401
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12
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13 try: # Compiled with SSL?
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14 import ssl
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15
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16 BaseSSLError = ssl.SSLError
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17 except (ImportError, AttributeError): # Platform-specific: No SSL.
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18 ssl = None
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19
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20 class BaseSSLError(BaseException):
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21 pass
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23
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24 try:
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25 # Python 3: not a no-op, we're adding this to the namespace so it can be imported.
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26 ConnectionError = ConnectionError
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27 except NameError:
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28 # Python 2
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29 class ConnectionError(Exception):
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30 pass
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32
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33 from .exceptions import (
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34 NewConnectionError,
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35 ConnectTimeoutError,
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36 SubjectAltNameWarning,
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37 SystemTimeWarning,
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38 )
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39 from .packages.ssl_match_hostname import match_hostname, CertificateError
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40
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41 from .util.ssl_ import (
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42 resolve_cert_reqs,
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43 resolve_ssl_version,
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44 assert_fingerprint,
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45 create_urllib3_context,
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46 ssl_wrap_socket,
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47 )
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49
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50 from .util import connection
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51
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52 from ._collections import HTTPHeaderDict
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53
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54 log = logging.getLogger(__name__)
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55
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56 port_by_scheme = {"http": 80, "https": 443}
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57
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58 # When it comes time to update this value as a part of regular maintenance
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59 # (ie test_recent_date is failing) update it to ~6 months before the current date.
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60 RECENT_DATE = datetime.date(2019, 1, 1)
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61
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62 _CONTAINS_CONTROL_CHAR_RE = re.compile(r"[^-!#$%&'*+.^_`|~0-9a-zA-Z]")
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63
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64
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65 class DummyConnection(object):
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66 """Used to detect a failed ConnectionCls import."""
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67
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68 pass
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69
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70
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71 class HTTPConnection(_HTTPConnection, object):
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72 """
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73 Based on httplib.HTTPConnection but provides an extra constructor
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74 backwards-compatibility layer between older and newer Pythons.
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75
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76 Additional keyword parameters are used to configure attributes of the connection.
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77 Accepted parameters include:
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78
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79 - ``strict``: See the documentation on :class:`urllib3.connectionpool.HTTPConnectionPool`
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80 - ``source_address``: Set the source address for the current connection.
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81 - ``socket_options``: Set specific options on the underlying socket. If not specified, then
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82 defaults are loaded from ``HTTPConnection.default_socket_options`` which includes disabling
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83 Nagle's algorithm (sets TCP_NODELAY to 1) unless the connection is behind a proxy.
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84
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85 For example, if you wish to enable TCP Keep Alive in addition to the defaults,
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86 you might pass::
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87
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88 HTTPConnection.default_socket_options + [
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89 (socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1),
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90 ]
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91
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92 Or you may want to disable the defaults by passing an empty list (e.g., ``[]``).
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93 """
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94
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95 default_port = port_by_scheme["http"]
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96
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97 #: Disable Nagle's algorithm by default.
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98 #: ``[(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)]``
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99 default_socket_options = [(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)]
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100
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101 #: Whether this connection verifies the host's certificate.
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102 is_verified = False
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103
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104 def __init__(self, *args, **kw):
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105 if not six.PY2:
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106 kw.pop("strict", None)
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107
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108 # Pre-set source_address.
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109 self.source_address = kw.get("source_address")
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110
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111 #: The socket options provided by the user. If no options are
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112 #: provided, we use the default options.
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113 self.socket_options = kw.pop("socket_options", self.default_socket_options)
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114
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115 _HTTPConnection.__init__(self, *args, **kw)
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116
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117 @property
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118 def host(self):
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119 """
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120 Getter method to remove any trailing dots that indicate the hostname is an FQDN.
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121
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122 In general, SSL certificates don't include the trailing dot indicating a
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123 fully-qualified domain name, and thus, they don't validate properly when
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124 checked against a domain name that includes the dot. In addition, some
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125 servers may not expect to receive the trailing dot when provided.
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126
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127 However, the hostname with trailing dot is critical to DNS resolution; doing a
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128 lookup with the trailing dot will properly only resolve the appropriate FQDN,
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129 whereas a lookup without a trailing dot will search the system's search domain
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130 list. Thus, it's important to keep the original host around for use only in
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131 those cases where it's appropriate (i.e., when doing DNS lookup to establish the
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132 actual TCP connection across which we're going to send HTTP requests).
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133 """
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134 return self._dns_host.rstrip(".")
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135
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136 @host.setter
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137 def host(self, value):
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138 """
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139 Setter for the `host` property.
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140
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141 We assume that only urllib3 uses the _dns_host attribute; httplib itself
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142 only uses `host`, and it seems reasonable that other libraries follow suit.
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143 """
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144 self._dns_host = value
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145
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146 def _new_conn(self):
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147 """ Establish a socket connection and set nodelay settings on it.
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148
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149 :return: New socket connection.
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150 """
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151 extra_kw = {}
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152 if self.source_address:
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153 extra_kw["source_address"] = self.source_address
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154
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155 if self.socket_options:
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156 extra_kw["socket_options"] = self.socket_options
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157
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158 try:
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159 conn = connection.create_connection(
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160 (self._dns_host, self.port), self.timeout, **extra_kw
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161 )
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162
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163 except SocketTimeout:
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164 raise ConnectTimeoutError(
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165 self,
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166 "Connection to %s timed out. (connect timeout=%s)"
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167 % (self.host, self.timeout),
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168 )
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169
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170 except SocketError as e:
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171 raise NewConnectionError(
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172 self, "Failed to establish a new connection: %s" % e
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173 )
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174
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175 return conn
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176
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177 def _prepare_conn(self, conn):
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178 self.sock = conn
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179 # Google App Engine's httplib does not define _tunnel_host
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180 if getattr(self, "_tunnel_host", None):
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181 # TODO: Fix tunnel so it doesn't depend on self.sock state.
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182 self._tunnel()
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183 # Mark this connection as not reusable
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184 self.auto_open = 0
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185
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186 def connect(self):
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187 conn = self._new_conn()
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188 self._prepare_conn(conn)
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189
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190 def putrequest(self, method, url, *args, **kwargs):
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191 """Send a request to the server"""
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192 match = _CONTAINS_CONTROL_CHAR_RE.search(method)
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193 if match:
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194 raise ValueError(
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195 "Method cannot contain non-token characters %r (found at least %r)"
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196 % (method, match.group())
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197 )
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198
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199 return _HTTPConnection.putrequest(self, method, url, *args, **kwargs)
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200
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201 def request_chunked(self, method, url, body=None, headers=None):
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202 """
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203 Alternative to the common request method, which sends the
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204 body with chunked encoding and not as one block
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205 """
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206 headers = HTTPHeaderDict(headers if headers is not None else {})
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207 skip_accept_encoding = "accept-encoding" in headers
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208 skip_host = "host" in headers
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209 self.putrequest(
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210 method, url, skip_accept_encoding=skip_accept_encoding, skip_host=skip_host
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211 )
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212 for header, value in headers.items():
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213 self.putheader(header, value)
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214 if "transfer-encoding" not in headers:
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215 self.putheader("Transfer-Encoding", "chunked")
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216 self.endheaders()
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217
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218 if body is not None:
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219 stringish_types = six.string_types + (bytes,)
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220 if isinstance(body, stringish_types):
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221 body = (body,)
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222 for chunk in body:
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223 if not chunk:
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224 continue
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225 if not isinstance(chunk, bytes):
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226 chunk = chunk.encode("utf8")
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227 len_str = hex(len(chunk))[2:]
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228 to_send = bytearray(len_str.encode())
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229 to_send += b"\r\n"
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230 to_send += chunk
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231 to_send += b"\r\n"
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232 self.send(to_send)
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233
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234 # After the if clause, to always have a closed body
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235 self.send(b"0\r\n\r\n")
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236
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237
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238 class HTTPSConnection(HTTPConnection):
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239 default_port = port_by_scheme["https"]
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240
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241 cert_reqs = None
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242 ca_certs = None
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243 ca_cert_dir = None
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244 ca_cert_data = None
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245 ssl_version = None
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246 assert_fingerprint = None
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247
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248 def __init__(
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249 self,
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250 host,
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251 port=None,
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252 key_file=None,
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253 cert_file=None,
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254 key_password=None,
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255 strict=None,
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256 timeout=socket._GLOBAL_DEFAULT_TIMEOUT,
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257 ssl_context=None,
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258 server_hostname=None,
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259 **kw
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260 ):
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261
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262 HTTPConnection.__init__(self, host, port, strict=strict, timeout=timeout, **kw)
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263
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264 self.key_file = key_file
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265 self.cert_file = cert_file
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266 self.key_password = key_password
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267 self.ssl_context = ssl_context
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268 self.server_hostname = server_hostname
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269
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270 # Required property for Google AppEngine 1.9.0 which otherwise causes
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271 # HTTPS requests to go out as HTTP. (See Issue #356)
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272 self._protocol = "https"
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273
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274 def set_cert(
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275 self,
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276 key_file=None,
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277 cert_file=None,
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278 cert_reqs=None,
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279 key_password=None,
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280 ca_certs=None,
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281 assert_hostname=None,
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282 assert_fingerprint=None,
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283 ca_cert_dir=None,
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284 ca_cert_data=None,
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285 ):
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286 """
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287 This method should only be called once, before the connection is used.
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288 """
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289 # If cert_reqs is not provided we'll assume CERT_REQUIRED unless we also
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290 # have an SSLContext object in which case we'll use its verify_mode.
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291 if cert_reqs is None:
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292 if self.ssl_context is not None:
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293 cert_reqs = self.ssl_context.verify_mode
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294 else:
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295 cert_reqs = resolve_cert_reqs(None)
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296
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297 self.key_file = key_file
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298 self.cert_file = cert_file
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299 self.cert_reqs = cert_reqs
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300 self.key_password = key_password
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301 self.assert_hostname = assert_hostname
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302 self.assert_fingerprint = assert_fingerprint
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303 self.ca_certs = ca_certs and os.path.expanduser(ca_certs)
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304 self.ca_cert_dir = ca_cert_dir and os.path.expanduser(ca_cert_dir)
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305 self.ca_cert_data = ca_cert_data
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306
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307 def connect(self):
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308 # Add certificate verification
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309 conn = self._new_conn()
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310 hostname = self.host
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311
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312 # Google App Engine's httplib does not define _tunnel_host
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313 if getattr(self, "_tunnel_host", None):
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314 self.sock = conn
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315 # Calls self._set_hostport(), so self.host is
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316 # self._tunnel_host below.
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317 self._tunnel()
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318 # Mark this connection as not reusable
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319 self.auto_open = 0
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320
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321 # Override the host with the one we're requesting data from.
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322 hostname = self._tunnel_host
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323
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324 server_hostname = hostname
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325 if self.server_hostname is not None:
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326 server_hostname = self.server_hostname
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327
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328 is_time_off = datetime.date.today() < RECENT_DATE
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329 if is_time_off:
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330 warnings.warn(
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331 (
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332 "System time is way off (before {0}). This will probably "
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333 "lead to SSL verification errors"
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334 ).format(RECENT_DATE),
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335 SystemTimeWarning,
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336 )
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337
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338 # Wrap socket using verification with the root certs in
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339 # trusted_root_certs
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340 default_ssl_context = False
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341 if self.ssl_context is None:
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342 default_ssl_context = True
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343 self.ssl_context = create_urllib3_context(
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344 ssl_version=resolve_ssl_version(self.ssl_version),
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345 cert_reqs=resolve_cert_reqs(self.cert_reqs),
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346 )
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347
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348 context = self.ssl_context
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349 context.verify_mode = resolve_cert_reqs(self.cert_reqs)
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350
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351 # Try to load OS default certs if none are given.
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352 # Works well on Windows (requires Python3.4+)
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353 if (
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354 not self.ca_certs
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355 and not self.ca_cert_dir
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356 and not self.ca_cert_data
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357 and default_ssl_context
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358 and hasattr(context, "load_default_certs")
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359 ):
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360 context.load_default_certs()
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361
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362 self.sock = ssl_wrap_socket(
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363 sock=conn,
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364 keyfile=self.key_file,
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365 certfile=self.cert_file,
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366 key_password=self.key_password,
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367 ca_certs=self.ca_certs,
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368 ca_cert_dir=self.ca_cert_dir,
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369 ca_cert_data=self.ca_cert_data,
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370 server_hostname=server_hostname,
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371 ssl_context=context,
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372 )
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373
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374 if self.assert_fingerprint:
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375 assert_fingerprint(
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376 self.sock.getpeercert(binary_form=True), self.assert_fingerprint
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377 )
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378 elif (
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379 context.verify_mode != ssl.CERT_NONE
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380 and not getattr(context, "check_hostname", False)
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381 and self.assert_hostname is not False
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382 ):
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383 # While urllib3 attempts to always turn off hostname matching from
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384 # the TLS library, this cannot always be done. So we check whether
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385 # the TLS Library still thinks it's matching hostnames.
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386 cert = self.sock.getpeercert()
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387 if not cert.get("subjectAltName", ()):
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388 warnings.warn(
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389 (
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390 "Certificate for {0} has no `subjectAltName`, falling back to check for a "
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391 "`commonName` for now. This feature is being removed by major browsers and "
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392 "deprecated by RFC 2818. (See https://github.com/urllib3/urllib3/issues/497 "
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393 "for details.)".format(hostname)
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394 ),
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395 SubjectAltNameWarning,
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396 )
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397 _match_hostname(cert, self.assert_hostname or server_hostname)
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398
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399 self.is_verified = (
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400 context.verify_mode == ssl.CERT_REQUIRED
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401 or self.assert_fingerprint is not None
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402 )
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403
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404
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405 def _match_hostname(cert, asserted_hostname):
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406 try:
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407 match_hostname(cert, asserted_hostname)
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408 except CertificateError as e:
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409 log.warning(
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410 "Certificate did not match expected hostname: %s. Certificate: %s",
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411 asserted_hostname,
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412 cert,
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413 )
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414 # Add cert to exception and reraise so client code can inspect
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415 # the cert when catching the exception, if they want to
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416 e._peer_cert = cert
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417 raise
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418
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419
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420 if not ssl:
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421 HTTPSConnection = DummyConnection # noqa: F811
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422
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423
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424 VerifiedHTTPSConnection = HTTPSConnection