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annotate planemo/lib/python3.7/site-packages/urllib3/contrib/socks.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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1 # -*- coding: utf-8 -*-
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2 """
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3 This module contains provisional support for SOCKS proxies from within
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4 urllib3. This module supports SOCKS4, SOCKS4A (an extension of SOCKS4), and
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5 SOCKS5. To enable its functionality, either install PySocks or install this
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6 module with the ``socks`` extra.
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7
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8 The SOCKS implementation supports the full range of urllib3 features. It also
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9 supports the following SOCKS features:
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10
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11 - SOCKS4A (``proxy_url='socks4a://...``)
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12 - SOCKS4 (``proxy_url='socks4://...``)
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13 - SOCKS5 with remote DNS (``proxy_url='socks5h://...``)
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14 - SOCKS5 with local DNS (``proxy_url='socks5://...``)
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15 - Usernames and passwords for the SOCKS proxy
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16
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17 .. note::
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18 It is recommended to use ``socks5h://`` or ``socks4a://`` schemes in
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19 your ``proxy_url`` to ensure that DNS resolution is done from the remote
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20 server instead of client-side when connecting to a domain name.
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21
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22 SOCKS4 supports IPv4 and domain names with the SOCKS4A extension. SOCKS5
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23 supports IPv4, IPv6, and domain names.
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24
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25 When connecting to a SOCKS4 proxy the ``username`` portion of the ``proxy_url``
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26 will be sent as the ``userid`` section of the SOCKS request::
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27
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28 proxy_url="socks4a://<userid>@proxy-host"
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29
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30 When connecting to a SOCKS5 proxy the ``username`` and ``password`` portion
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31 of the ``proxy_url`` will be sent as the username/password to authenticate
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32 with the proxy::
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33
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34 proxy_url="socks5h://<username>:<password>@proxy-host"
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35
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36 """
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37 from __future__ import absolute_import
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38
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39 try:
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40 import socks
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41 except ImportError:
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42 import warnings
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43 from ..exceptions import DependencyWarning
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44
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45 warnings.warn(
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46 (
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47 "SOCKS support in urllib3 requires the installation of optional "
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48 "dependencies: specifically, PySocks. For more information, see "
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49 "https://urllib3.readthedocs.io/en/latest/contrib.html#socks-proxies"
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50 ),
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51 DependencyWarning,
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52 )
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53 raise
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54
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55 from socket import error as SocketError, timeout as SocketTimeout
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56
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57 from ..connection import HTTPConnection, HTTPSConnection
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58 from ..connectionpool import HTTPConnectionPool, HTTPSConnectionPool
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59 from ..exceptions import ConnectTimeoutError, NewConnectionError
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60 from ..poolmanager import PoolManager
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61 from ..util.url import parse_url
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62
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63 try:
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64 import ssl
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65 except ImportError:
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66 ssl = None
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67
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68
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69 class SOCKSConnection(HTTPConnection):
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70 """
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71 A plain-text HTTP connection that connects via a SOCKS proxy.
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72 """
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73
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74 def __init__(self, *args, **kwargs):
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75 self._socks_options = kwargs.pop("_socks_options")
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76 super(SOCKSConnection, self).__init__(*args, **kwargs)
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77
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78 def _new_conn(self):
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79 """
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80 Establish a new connection via the SOCKS proxy.
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81 """
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82 extra_kw = {}
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83 if self.source_address:
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84 extra_kw["source_address"] = self.source_address
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85
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86 if self.socket_options:
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87 extra_kw["socket_options"] = self.socket_options
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88
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89 try:
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90 conn = socks.create_connection(
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91 (self.host, self.port),
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92 proxy_type=self._socks_options["socks_version"],
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93 proxy_addr=self._socks_options["proxy_host"],
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94 proxy_port=self._socks_options["proxy_port"],
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95 proxy_username=self._socks_options["username"],
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96 proxy_password=self._socks_options["password"],
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97 proxy_rdns=self._socks_options["rdns"],
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98 timeout=self.timeout,
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99 **extra_kw
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100 )
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101
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102 except SocketTimeout:
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103 raise ConnectTimeoutError(
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104 self,
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105 "Connection to %s timed out. (connect timeout=%s)"
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106 % (self.host, self.timeout),
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107 )
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108
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109 except socks.ProxyError as e:
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110 # This is fragile as hell, but it seems to be the only way to raise
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111 # useful errors here.
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112 if e.socket_err:
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113 error = e.socket_err
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114 if isinstance(error, SocketTimeout):
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115 raise ConnectTimeoutError(
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116 self,
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117 "Connection to %s timed out. (connect timeout=%s)"
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118 % (self.host, self.timeout),
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119 )
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120 else:
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121 raise NewConnectionError(
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122 self, "Failed to establish a new connection: %s" % error
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123 )
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124 else:
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125 raise NewConnectionError(
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126 self, "Failed to establish a new connection: %s" % e
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127 )
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128
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129 except SocketError as e: # Defensive: PySocks should catch all these.
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130 raise NewConnectionError(
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131 self, "Failed to establish a new connection: %s" % e
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132 )
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133
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134 return conn
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135
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136
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137 # We don't need to duplicate the Verified/Unverified distinction from
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138 # urllib3/connection.py here because the HTTPSConnection will already have been
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139 # correctly set to either the Verified or Unverified form by that module. This
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140 # means the SOCKSHTTPSConnection will automatically be the correct type.
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141 class SOCKSHTTPSConnection(SOCKSConnection, HTTPSConnection):
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142 pass
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143
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144
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145 class SOCKSHTTPConnectionPool(HTTPConnectionPool):
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146 ConnectionCls = SOCKSConnection
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147
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148
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149 class SOCKSHTTPSConnectionPool(HTTPSConnectionPool):
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150 ConnectionCls = SOCKSHTTPSConnection
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151
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152
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153 class SOCKSProxyManager(PoolManager):
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154 """
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155 A version of the urllib3 ProxyManager that routes connections via the
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156 defined SOCKS proxy.
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157 """
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158
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159 pool_classes_by_scheme = {
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160 "http": SOCKSHTTPConnectionPool,
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161 "https": SOCKSHTTPSConnectionPool,
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162 }
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163
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164 def __init__(
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165 self,
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166 proxy_url,
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167 username=None,
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168 password=None,
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169 num_pools=10,
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170 headers=None,
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171 **connection_pool_kw
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172 ):
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173 parsed = parse_url(proxy_url)
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174
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175 if username is None and password is None and parsed.auth is not None:
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176 split = parsed.auth.split(":")
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177 if len(split) == 2:
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178 username, password = split
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179 if parsed.scheme == "socks5":
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180 socks_version = socks.PROXY_TYPE_SOCKS5
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181 rdns = False
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182 elif parsed.scheme == "socks5h":
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183 socks_version = socks.PROXY_TYPE_SOCKS5
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184 rdns = True
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185 elif parsed.scheme == "socks4":
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186 socks_version = socks.PROXY_TYPE_SOCKS4
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187 rdns = False
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188 elif parsed.scheme == "socks4a":
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189 socks_version = socks.PROXY_TYPE_SOCKS4
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190 rdns = True
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191 else:
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192 raise ValueError("Unable to determine SOCKS version from %s" % proxy_url)
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193
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194 self.proxy_url = proxy_url
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195
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196 socks_options = {
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197 "socks_version": socks_version,
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198 "proxy_host": parsed.host,
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199 "proxy_port": parsed.port,
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200 "username": username,
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201 "password": password,
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202 "rdns": rdns,
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203 }
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204 connection_pool_kw["_socks_options"] = socks_options
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205
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206 super(SOCKSProxyManager, self).__init__(
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207 num_pools, headers, **connection_pool_kw
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208 )
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209
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210 self.pool_classes_by_scheme = SOCKSProxyManager.pool_classes_by_scheme