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annotate env/lib/python3.9/site-packages/urllib3/connection.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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1 from __future__ import absolute_import
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2
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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 re
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7 import socket
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8 import warnings
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9 from socket import error as SocketError
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10 from socket import timeout as SocketTimeout
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11
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12 from .packages import six
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13 from .packages.six.moves.http_client import HTTPConnection as _HTTPConnection
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14 from .packages.six.moves.http_client import HTTPException # noqa: F401
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15 from .util.proxy import create_proxy_ssl_context
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16
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17 try: # Compiled with SSL?
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18 import ssl
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19
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20 BaseSSLError = ssl.SSLError
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21 except (ImportError, AttributeError): # Platform-specific: No SSL.
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22 ssl = None
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23
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24 class BaseSSLError(BaseException):
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25 pass
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26
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27
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28 try:
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29 # Python 3: not a no-op, we're adding this to the namespace so it can be imported.
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30 ConnectionError = ConnectionError
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31 except NameError:
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32 # Python 2
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33 class ConnectionError(Exception):
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34 pass
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35
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36
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37 try: # Python 3:
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38 # Not a no-op, we're adding this to the namespace so it can be imported.
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39 BrokenPipeError = BrokenPipeError
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40 except NameError: # Python 2:
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41
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42 class BrokenPipeError(Exception):
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43 pass
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44
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45
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46 from ._collections import HTTPHeaderDict # noqa (historical, removed in v2)
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47 from ._version import __version__
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48 from .exceptions import (
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49 ConnectTimeoutError,
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50 NewConnectionError,
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51 SubjectAltNameWarning,
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52 SystemTimeWarning,
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53 )
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54 from .packages.ssl_match_hostname import CertificateError, match_hostname
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55 from .util import SKIP_HEADER, SKIPPABLE_HEADERS, connection
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56 from .util.ssl_ import (
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57 assert_fingerprint,
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58 create_urllib3_context,
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59 resolve_cert_reqs,
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60 resolve_ssl_version,
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61 ssl_wrap_socket,
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62 )
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63
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64 log = logging.getLogger(__name__)
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65
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66 port_by_scheme = {"http": 80, "https": 443}
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67
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68 # When it comes time to update this value as a part of regular maintenance
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69 # (ie test_recent_date is failing) update it to ~6 months before the current date.
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70 RECENT_DATE = datetime.date(2020, 7, 1)
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71
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72 _CONTAINS_CONTROL_CHAR_RE = re.compile(r"[^-!#$%&'*+.^_`|~0-9a-zA-Z]")
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73
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74
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75 class HTTPConnection(_HTTPConnection, object):
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76 """
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77 Based on :class:`http.client.HTTPConnection` but provides an extra constructor
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78 backwards-compatibility layer between older and newer Pythons.
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79
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80 Additional keyword parameters are used to configure attributes of the connection.
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81 Accepted parameters include:
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82
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83 - ``strict``: See the documentation on :class:`urllib3.connectionpool.HTTPConnectionPool`
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84 - ``source_address``: Set the source address for the current connection.
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85 - ``socket_options``: Set specific options on the underlying socket. If not specified, then
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86 defaults are loaded from ``HTTPConnection.default_socket_options`` which includes disabling
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87 Nagle's algorithm (sets TCP_NODELAY to 1) unless the connection is behind a proxy.
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88
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89 For example, if you wish to enable TCP Keep Alive in addition to the defaults,
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90 you might pass:
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91
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92 .. code-block:: python
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93
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94 HTTPConnection.default_socket_options + [
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95 (socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1),
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96 ]
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97
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98 Or you may want to disable the defaults by passing an empty list (e.g., ``[]``).
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99 """
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100
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101 default_port = port_by_scheme["http"]
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102
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103 #: Disable Nagle's algorithm by default.
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104 #: ``[(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)]``
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105 default_socket_options = [(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)]
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106
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107 #: Whether this connection verifies the host's certificate.
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108 is_verified = False
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109
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110 def __init__(self, *args, **kw):
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111 if not six.PY2:
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112 kw.pop("strict", None)
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113
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114 # Pre-set source_address.
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115 self.source_address = kw.get("source_address")
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116
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117 #: The socket options provided by the user. If no options are
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118 #: provided, we use the default options.
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119 self.socket_options = kw.pop("socket_options", self.default_socket_options)
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120
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121 # Proxy options provided by the user.
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122 self.proxy = kw.pop("proxy", None)
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123 self.proxy_config = kw.pop("proxy_config", None)
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124
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125 _HTTPConnection.__init__(self, *args, **kw)
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126
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127 @property
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128 def host(self):
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129 """
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130 Getter method to remove any trailing dots that indicate the hostname is an FQDN.
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131
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132 In general, SSL certificates don't include the trailing dot indicating a
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133 fully-qualified domain name, and thus, they don't validate properly when
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134 checked against a domain name that includes the dot. In addition, some
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135 servers may not expect to receive the trailing dot when provided.
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136
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137 However, the hostname with trailing dot is critical to DNS resolution; doing a
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138 lookup with the trailing dot will properly only resolve the appropriate FQDN,
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139 whereas a lookup without a trailing dot will search the system's search domain
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140 list. Thus, it's important to keep the original host around for use only in
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141 those cases where it's appropriate (i.e., when doing DNS lookup to establish the
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142 actual TCP connection across which we're going to send HTTP requests).
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143 """
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144 return self._dns_host.rstrip(".")
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145
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146 @host.setter
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147 def host(self, value):
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148 """
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149 Setter for the `host` property.
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150
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151 We assume that only urllib3 uses the _dns_host attribute; httplib itself
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152 only uses `host`, and it seems reasonable that other libraries follow suit.
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153 """
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154 self._dns_host = value
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155
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156 def _new_conn(self):
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157 """Establish a socket connection and set nodelay settings on it.
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158
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159 :return: New socket connection.
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160 """
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161 extra_kw = {}
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162 if self.source_address:
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163 extra_kw["source_address"] = self.source_address
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164
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165 if self.socket_options:
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166 extra_kw["socket_options"] = self.socket_options
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167
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168 try:
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169 conn = connection.create_connection(
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170 (self._dns_host, self.port), self.timeout, **extra_kw
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171 )
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172
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173 except SocketTimeout:
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174 raise ConnectTimeoutError(
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175 self,
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176 "Connection to %s timed out. (connect timeout=%s)"
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177 % (self.host, self.timeout),
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178 )
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179
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180 except SocketError as e:
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181 raise NewConnectionError(
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182 self, "Failed to establish a new connection: %s" % e
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183 )
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184
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185 return conn
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186
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187 def _is_using_tunnel(self):
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188 # Google App Engine's httplib does not define _tunnel_host
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189 return getattr(self, "_tunnel_host", None)
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190
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191 def _prepare_conn(self, conn):
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192 self.sock = conn
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193 if self._is_using_tunnel():
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194 # TODO: Fix tunnel so it doesn't depend on self.sock state.
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195 self._tunnel()
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196 # Mark this connection as not reusable
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197 self.auto_open = 0
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198
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199 def connect(self):
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200 conn = self._new_conn()
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201 self._prepare_conn(conn)
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202
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203 def putrequest(self, method, url, *args, **kwargs):
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204 """"""
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205 # Empty docstring because the indentation of CPython's implementation
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206 # is broken but we don't want this method in our documentation.
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207 match = _CONTAINS_CONTROL_CHAR_RE.search(method)
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208 if match:
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209 raise ValueError(
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210 "Method cannot contain non-token characters %r (found at least %r)"
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211 % (method, match.group())
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212 )
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213
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214 return _HTTPConnection.putrequest(self, method, url, *args, **kwargs)
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215
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216 def putheader(self, header, *values):
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217 """"""
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218 if not any(isinstance(v, str) and v == SKIP_HEADER for v in values):
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219 _HTTPConnection.putheader(self, header, *values)
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220 elif six.ensure_str(header.lower()) not in SKIPPABLE_HEADERS:
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221 raise ValueError(
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222 "urllib3.util.SKIP_HEADER only supports '%s'"
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223 % ("', '".join(map(str.title, sorted(SKIPPABLE_HEADERS))),)
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224 )
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225
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226 def request(self, method, url, body=None, headers=None):
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227 if headers is None:
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228 headers = {}
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229 else:
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230 # Avoid modifying the headers passed into .request()
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231 headers = headers.copy()
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232 if "user-agent" not in (six.ensure_str(k.lower()) for k in headers):
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233 headers["User-Agent"] = _get_default_user_agent()
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234 super(HTTPConnection, self).request(method, url, body=body, headers=headers)
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235
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236 def request_chunked(self, method, url, body=None, headers=None):
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237 """
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238 Alternative to the common request method, which sends the
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239 body with chunked encoding and not as one block
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240 """
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241 headers = headers or {}
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242 header_keys = set([six.ensure_str(k.lower()) for k in headers])
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243 skip_accept_encoding = "accept-encoding" in header_keys
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244 skip_host = "host" in header_keys
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245 self.putrequest(
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246 method, url, skip_accept_encoding=skip_accept_encoding, skip_host=skip_host
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247 )
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248 if "user-agent" not in header_keys:
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249 self.putheader("User-Agent", _get_default_user_agent())
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250 for header, value in headers.items():
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251 self.putheader(header, value)
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252 if "transfer-encoding" not in headers:
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253 self.putheader("Transfer-Encoding", "chunked")
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254 self.endheaders()
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255
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256 if body is not None:
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257 stringish_types = six.string_types + (bytes,)
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258 if isinstance(body, stringish_types):
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259 body = (body,)
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260 for chunk in body:
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261 if not chunk:
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262 continue
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263 if not isinstance(chunk, bytes):
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264 chunk = chunk.encode("utf8")
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265 len_str = hex(len(chunk))[2:]
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266 to_send = bytearray(len_str.encode())
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267 to_send += b"\r\n"
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268 to_send += chunk
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269 to_send += b"\r\n"
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270 self.send(to_send)
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271
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272 # After the if clause, to always have a closed body
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273 self.send(b"0\r\n\r\n")
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274
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275
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276 class HTTPSConnection(HTTPConnection):
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277 """
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278 Many of the parameters to this constructor are passed to the underlying SSL
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279 socket by means of :py:func:`urllib3.util.ssl_wrap_socket`.
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280 """
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281
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282 default_port = port_by_scheme["https"]
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283
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284 cert_reqs = None
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285 ca_certs = None
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286 ca_cert_dir = None
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287 ca_cert_data = None
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288 ssl_version = None
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289 assert_fingerprint = None
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290 tls_in_tls_required = False
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291
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292 def __init__(
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293 self,
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294 host,
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295 port=None,
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296 key_file=None,
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297 cert_file=None,
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298 key_password=None,
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299 strict=None,
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300 timeout=socket._GLOBAL_DEFAULT_TIMEOUT,
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301 ssl_context=None,
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302 server_hostname=None,
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303 **kw
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304 ):
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305
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306 HTTPConnection.__init__(self, host, port, strict=strict, timeout=timeout, **kw)
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307
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308 self.key_file = key_file
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309 self.cert_file = cert_file
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310 self.key_password = key_password
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311 self.ssl_context = ssl_context
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312 self.server_hostname = server_hostname
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313
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314 # Required property for Google AppEngine 1.9.0 which otherwise causes
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315 # HTTPS requests to go out as HTTP. (See Issue #356)
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316 self._protocol = "https"
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317
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318 def set_cert(
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319 self,
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320 key_file=None,
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321 cert_file=None,
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322 cert_reqs=None,
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323 key_password=None,
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324 ca_certs=None,
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325 assert_hostname=None,
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326 assert_fingerprint=None,
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327 ca_cert_dir=None,
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328 ca_cert_data=None,
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329 ):
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330 """
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331 This method should only be called once, before the connection is used.
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332 """
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333 # If cert_reqs is not provided we'll assume CERT_REQUIRED unless we also
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334 # have an SSLContext object in which case we'll use its verify_mode.
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335 if cert_reqs is None:
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336 if self.ssl_context is not None:
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337 cert_reqs = self.ssl_context.verify_mode
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338 else:
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339 cert_reqs = resolve_cert_reqs(None)
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340
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341 self.key_file = key_file
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342 self.cert_file = cert_file
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343 self.cert_reqs = cert_reqs
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344 self.key_password = key_password
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345 self.assert_hostname = assert_hostname
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346 self.assert_fingerprint = assert_fingerprint
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347 self.ca_certs = ca_certs and os.path.expanduser(ca_certs)
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348 self.ca_cert_dir = ca_cert_dir and os.path.expanduser(ca_cert_dir)
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349 self.ca_cert_data = ca_cert_data
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350
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351 def connect(self):
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352 # Add certificate verification
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353 conn = self._new_conn()
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354 hostname = self.host
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355 tls_in_tls = False
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356
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357 if self._is_using_tunnel():
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358 if self.tls_in_tls_required:
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359 conn = self._connect_tls_proxy(hostname, conn)
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360 tls_in_tls = True
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361
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362 self.sock = conn
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363
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364 # Calls self._set_hostport(), so self.host is
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365 # self._tunnel_host below.
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366 self._tunnel()
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367 # Mark this connection as not reusable
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368 self.auto_open = 0
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369
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370 # Override the host with the one we're requesting data from.
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371 hostname = self._tunnel_host
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372
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373 server_hostname = hostname
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374 if self.server_hostname is not None:
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375 server_hostname = self.server_hostname
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376
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377 is_time_off = datetime.date.today() < RECENT_DATE
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378 if is_time_off:
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379 warnings.warn(
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380 (
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381 "System time is way off (before {0}). This will probably "
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382 "lead to SSL verification errors"
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383 ).format(RECENT_DATE),
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384 SystemTimeWarning,
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385 )
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386
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387 # Wrap socket using verification with the root certs in
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388 # trusted_root_certs
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389 default_ssl_context = False
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390 if self.ssl_context is None:
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391 default_ssl_context = True
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392 self.ssl_context = create_urllib3_context(
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393 ssl_version=resolve_ssl_version(self.ssl_version),
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394 cert_reqs=resolve_cert_reqs(self.cert_reqs),
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395 )
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396
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397 context = self.ssl_context
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398 context.verify_mode = resolve_cert_reqs(self.cert_reqs)
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399
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400 # Try to load OS default certs if none are given.
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401 # Works well on Windows (requires Python3.4+)
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402 if (
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403 not self.ca_certs
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404 and not self.ca_cert_dir
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405 and not self.ca_cert_data
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406 and default_ssl_context
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407 and hasattr(context, "load_default_certs")
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408 ):
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409 context.load_default_certs()
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410
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411 self.sock = ssl_wrap_socket(
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412 sock=conn,
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413 keyfile=self.key_file,
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414 certfile=self.cert_file,
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415 key_password=self.key_password,
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416 ca_certs=self.ca_certs,
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417 ca_cert_dir=self.ca_cert_dir,
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418 ca_cert_data=self.ca_cert_data,
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419 server_hostname=server_hostname,
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420 ssl_context=context,
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421 tls_in_tls=tls_in_tls,
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422 )
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423
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424 # If we're using all defaults and the connection
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425 # is TLSv1 or TLSv1.1 we throw a DeprecationWarning
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426 # for the host.
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427 if (
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428 default_ssl_context
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429 and self.ssl_version is None
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430 and hasattr(self.sock, "version")
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431 and self.sock.version() in {"TLSv1", "TLSv1.1"}
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432 ):
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433 warnings.warn(
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434 "Negotiating TLSv1/TLSv1.1 by default is deprecated "
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435 "and will be disabled in urllib3 v2.0.0. Connecting to "
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436 "'%s' with '%s' can be enabled by explicitly opting-in "
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437 "with 'ssl_version'" % (self.host, self.sock.version()),
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438 DeprecationWarning,
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439 )
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440
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441 if self.assert_fingerprint:
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442 assert_fingerprint(
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443 self.sock.getpeercert(binary_form=True), self.assert_fingerprint
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444 )
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445 elif (
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446 context.verify_mode != ssl.CERT_NONE
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447 and not getattr(context, "check_hostname", False)
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448 and self.assert_hostname is not False
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449 ):
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450 # While urllib3 attempts to always turn off hostname matching from
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451 # the TLS library, this cannot always be done. So we check whether
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452 # the TLS Library still thinks it's matching hostnames.
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453 cert = self.sock.getpeercert()
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454 if not cert.get("subjectAltName", ()):
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455 warnings.warn(
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456 (
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457 "Certificate for {0} has no `subjectAltName`, falling back to check for a "
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458 "`commonName` for now. This feature is being removed by major browsers and "
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459 "deprecated by RFC 2818. (See https://github.com/urllib3/urllib3/issues/497 "
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460 "for details.)".format(hostname)
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461 ),
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462 SubjectAltNameWarning,
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463 )
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464 _match_hostname(cert, self.assert_hostname or server_hostname)
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465
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466 self.is_verified = (
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467 context.verify_mode == ssl.CERT_REQUIRED
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468 or self.assert_fingerprint is not None
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469 )
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470
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471 def _connect_tls_proxy(self, hostname, conn):
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472 """
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473 Establish a TLS connection to the proxy using the provided SSL context.
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474 """
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475 proxy_config = self.proxy_config
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476 ssl_context = proxy_config.ssl_context
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477 if ssl_context:
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478 # If the user provided a proxy context, we assume CA and client
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479 # certificates have already been set
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480 return ssl_wrap_socket(
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481 sock=conn,
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482 server_hostname=hostname,
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483 ssl_context=ssl_context,
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484 )
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485
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486 ssl_context = create_proxy_ssl_context(
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487 self.ssl_version,
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488 self.cert_reqs,
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489 self.ca_certs,
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490 self.ca_cert_dir,
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491 self.ca_cert_data,
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492 )
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493 # By default urllib3's SSLContext disables `check_hostname` and uses
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494 # a custom check. For proxies we're good with relying on the default
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495 # verification.
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496 ssl_context.check_hostname = True
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497
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498 # If no cert was provided, use only the default options for server
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499 # certificate validation
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500 return ssl_wrap_socket(
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501 sock=conn,
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502 ca_certs=self.ca_certs,
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503 ca_cert_dir=self.ca_cert_dir,
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504 ca_cert_data=self.ca_cert_data,
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505 server_hostname=hostname,
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506 ssl_context=ssl_context,
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507 )
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508
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509
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510 def _match_hostname(cert, asserted_hostname):
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511 try:
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512 match_hostname(cert, asserted_hostname)
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513 except CertificateError as e:
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514 log.warning(
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515 "Certificate did not match expected hostname: %s. Certificate: %s",
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516 asserted_hostname,
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517 cert,
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518 )
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519 # Add cert to exception and reraise so client code can inspect
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520 # the cert when catching the exception, if they want to
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521 e._peer_cert = cert
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522 raise
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523
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524
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525 def _get_default_user_agent():
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526 return "python-urllib3/%s" % __version__
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527
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528
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529 class DummyConnection(object):
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530 """Used to detect a failed ConnectionCls import."""
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531
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532 pass
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533
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534
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535 if not ssl:
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536 HTTPSConnection = DummyConnection # noqa: F811
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537
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538
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539 VerifiedHTTPSConnection = HTTPSConnection