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annotate venv/lib/python2.7/site-packages/requests/packages/urllib3/connection.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 import datetime
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2 import sys
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3 import socket
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4 from socket import error as SocketError, timeout as SocketTimeout
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5 import warnings
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6 from .packages import six
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7
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8 try: # Python 3
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9 from http.client import HTTPConnection as _HTTPConnection, HTTPException
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10 except ImportError:
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11 from httplib import HTTPConnection as _HTTPConnection, HTTPException
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12
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13
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14 class DummyConnection(object):
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15 "Used to detect a failed ConnectionCls import."
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16 pass
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17
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18
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19 try: # Compiled with SSL?
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20 HTTPSConnection = DummyConnection
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21 import ssl
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22 BaseSSLError = ssl.SSLError
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23 except (ImportError, AttributeError): # Platform-specific: No SSL.
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24 ssl = None
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25
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26 class BaseSSLError(BaseException):
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27 pass
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28
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29
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30 try: # Python 3:
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31 # Not a no-op, we're adding this to the namespace so it can be imported.
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32 ConnectionError = ConnectionError
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33 except NameError: # Python 2:
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34 class ConnectionError(Exception):
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35 pass
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36
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37
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38 from .exceptions import (
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39 NewConnectionError,
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40 ConnectTimeoutError,
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41 SubjectAltNameWarning,
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42 SystemTimeWarning,
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43 )
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44 from .packages.ssl_match_hostname import match_hostname
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45
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46 from .util.ssl_ import (
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47 resolve_cert_reqs,
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48 resolve_ssl_version,
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49 ssl_wrap_socket,
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50 assert_fingerprint,
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51 )
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52
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53
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54 from .util import connection
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55
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56 port_by_scheme = {
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57 'http': 80,
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58 'https': 443,
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59 }
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60
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61 RECENT_DATE = datetime.date(2014, 1, 1)
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62
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63
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64 class HTTPConnection(_HTTPConnection, object):
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65 """
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66 Based on httplib.HTTPConnection but provides an extra constructor
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67 backwards-compatibility layer between older and newer Pythons.
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68
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69 Additional keyword parameters are used to configure attributes of the connection.
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70 Accepted parameters include:
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71
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72 - ``strict``: See the documentation on :class:`urllib3.connectionpool.HTTPConnectionPool`
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73 - ``source_address``: Set the source address for the current connection.
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74
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75 .. note:: This is ignored for Python 2.6. It is only applied for 2.7 and 3.x
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76
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77 - ``socket_options``: Set specific options on the underlying socket. If not specified, then
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78 defaults are loaded from ``HTTPConnection.default_socket_options`` which includes disabling
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79 Nagle's algorithm (sets TCP_NODELAY to 1) unless the connection is behind a proxy.
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80
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81 For example, if you wish to enable TCP Keep Alive in addition to the defaults,
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82 you might pass::
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83
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84 HTTPConnection.default_socket_options + [
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85 (socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1),
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86 ]
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87
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88 Or you may want to disable the defaults by passing an empty list (e.g., ``[]``).
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89 """
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90
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91 default_port = port_by_scheme['http']
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92
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93 #: Disable Nagle's algorithm by default.
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94 #: ``[(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)]``
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95 default_socket_options = [(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)]
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96
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97 #: Whether this connection verifies the host's certificate.
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98 is_verified = False
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99
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100 def __init__(self, *args, **kw):
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101 if six.PY3: # Python 3
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102 kw.pop('strict', None)
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103
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104 # Pre-set source_address in case we have an older Python like 2.6.
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105 self.source_address = kw.get('source_address')
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106
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107 if sys.version_info < (2, 7): # Python 2.6
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108 # _HTTPConnection on Python 2.6 will balk at this keyword arg, but
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109 # not newer versions. We can still use it when creating a
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110 # connection though, so we pop it *after* we have saved it as
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111 # self.source_address.
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112 kw.pop('source_address', None)
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113
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114 #: The socket options provided by the user. If no options are
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115 #: provided, we use the default options.
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116 self.socket_options = kw.pop('socket_options', self.default_socket_options)
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117
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118 # Superclass also sets self.source_address in Python 2.7+.
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119 _HTTPConnection.__init__(self, *args, **kw)
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120
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121 def _new_conn(self):
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122 """ Establish a socket connection and set nodelay settings on it.
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123
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124 :return: New socket connection.
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125 """
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126 extra_kw = {}
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127 if self.source_address:
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128 extra_kw['source_address'] = self.source_address
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129
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130 if self.socket_options:
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131 extra_kw['socket_options'] = self.socket_options
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132
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133 try:
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134 conn = connection.create_connection(
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135 (self.host, self.port), self.timeout, **extra_kw)
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136
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137 except SocketTimeout as e:
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138 raise ConnectTimeoutError(
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139 self, "Connection to %s timed out. (connect timeout=%s)" %
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140 (self.host, self.timeout))
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141
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142 except SocketError as e:
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143 raise NewConnectionError(
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144 self, "Failed to establish a new connection: %s" % e)
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145
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146 return conn
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147
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148 def _prepare_conn(self, conn):
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149 self.sock = conn
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150 # the _tunnel_host attribute was added in python 2.6.3 (via
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151 # http://hg.python.org/cpython/rev/0f57b30a152f) so pythons 2.6(0-2) do
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152 # not have them.
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153 if getattr(self, '_tunnel_host', None):
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154 # TODO: Fix tunnel so it doesn't depend on self.sock state.
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155 self._tunnel()
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156 # Mark this connection as not reusable
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157 self.auto_open = 0
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158
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159 def connect(self):
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160 conn = self._new_conn()
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161 self._prepare_conn(conn)
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162
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163
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164 class HTTPSConnection(HTTPConnection):
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165 default_port = port_by_scheme['https']
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166
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167 def __init__(self, host, port=None, key_file=None, cert_file=None,
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168 strict=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT, **kw):
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169
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170 HTTPConnection.__init__(self, host, port, strict=strict,
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171 timeout=timeout, **kw)
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172
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173 self.key_file = key_file
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174 self.cert_file = cert_file
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175
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176 # Required property for Google AppEngine 1.9.0 which otherwise causes
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177 # HTTPS requests to go out as HTTP. (See Issue #356)
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178 self._protocol = 'https'
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179
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180 def connect(self):
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181 conn = self._new_conn()
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182 self._prepare_conn(conn)
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183 self.sock = ssl.wrap_socket(conn, self.key_file, self.cert_file)
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184
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185
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186 class VerifiedHTTPSConnection(HTTPSConnection):
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187 """
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188 Based on httplib.HTTPSConnection but wraps the socket with
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189 SSL certification.
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190 """
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191 cert_reqs = None
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192 ca_certs = None
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193 ca_cert_dir = None
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194 ssl_version = None
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195 assert_fingerprint = None
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196
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197 def set_cert(self, key_file=None, cert_file=None,
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198 cert_reqs=None, ca_certs=None,
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199 assert_hostname=None, assert_fingerprint=None,
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200 ca_cert_dir=None):
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201
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202 if (ca_certs or ca_cert_dir) and cert_reqs is None:
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203 cert_reqs = 'CERT_REQUIRED'
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204
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205 self.key_file = key_file
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206 self.cert_file = cert_file
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207 self.cert_reqs = cert_reqs
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208 self.ca_certs = ca_certs
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209 self.ca_cert_dir = ca_cert_dir
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210 self.assert_hostname = assert_hostname
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211 self.assert_fingerprint = assert_fingerprint
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212
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213 def connect(self):
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214 # Add certificate verification
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215 conn = self._new_conn()
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216
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217 resolved_cert_reqs = resolve_cert_reqs(self.cert_reqs)
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218 resolved_ssl_version = resolve_ssl_version(self.ssl_version)
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219
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220 hostname = self.host
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221 if getattr(self, '_tunnel_host', None):
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222 # _tunnel_host was added in Python 2.6.3
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223 # (See: http://hg.python.org/cpython/rev/0f57b30a152f)
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224
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225 self.sock = conn
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226 # Calls self._set_hostport(), so self.host is
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227 # self._tunnel_host below.
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228 self._tunnel()
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229 # Mark this connection as not reusable
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230 self.auto_open = 0
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231
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232 # Override the host with the one we're requesting data from.
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233 hostname = self._tunnel_host
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234
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235 is_time_off = datetime.date.today() < RECENT_DATE
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236 if is_time_off:
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237 warnings.warn((
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238 'System time is way off (before {0}). This will probably '
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239 'lead to SSL verification errors').format(RECENT_DATE),
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240 SystemTimeWarning
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241 )
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242
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243 # Wrap socket using verification with the root certs in
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244 # trusted_root_certs
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245 self.sock = ssl_wrap_socket(conn, self.key_file, self.cert_file,
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246 cert_reqs=resolved_cert_reqs,
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247 ca_certs=self.ca_certs,
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248 ca_cert_dir=self.ca_cert_dir,
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249 server_hostname=hostname,
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250 ssl_version=resolved_ssl_version)
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251
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252 if self.assert_fingerprint:
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253 assert_fingerprint(self.sock.getpeercert(binary_form=True),
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254 self.assert_fingerprint)
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255 elif resolved_cert_reqs != ssl.CERT_NONE \
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256 and self.assert_hostname is not False:
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257 cert = self.sock.getpeercert()
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258 if not cert.get('subjectAltName', ()):
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259 warnings.warn((
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260 'Certificate for {0} has no `subjectAltName`, falling back to check for a '
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261 '`commonName` for now. This feature is being removed by major browsers and '
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262 'deprecated by RFC 2818. (See https://github.com/shazow/urllib3/issues/497 '
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263 'for details.)'.format(hostname)),
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264 SubjectAltNameWarning
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265 )
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266 match_hostname(cert, self.assert_hostname or hostname)
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267
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268 self.is_verified = (resolved_cert_reqs == ssl.CERT_REQUIRED
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269 or self.assert_fingerprint is not None)
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270
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271
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272 if ssl:
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273 # Make a copy for testing.
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274 UnverifiedHTTPSConnection = HTTPSConnection
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275 HTTPSConnection = VerifiedHTTPSConnection
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276 else:
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277 HTTPSConnection = DummyConnection