Mercurial > repos > shellac > sam_consensus_v3

annotate env/lib/python3.9/site-packages/urllib3/contrib/socks.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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0
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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 .. code-block:: python
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29
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30 proxy_url="socks4a://<userid>@proxy-host"
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31
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32 When connecting to a SOCKS5 proxy the ``username`` and ``password`` portion
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33 of the ``proxy_url`` will be sent as the username/password to authenticate
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34 with the proxy:
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35
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36 .. code-block:: python
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37
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38 proxy_url="socks5h://<username>:<password>@proxy-host"
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39
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40 """
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41 from __future__ import absolute_import
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42
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43 try:
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44 import socks
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45 except ImportError:
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46 import warnings
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47
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48 from ..exceptions import DependencyWarning
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49
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50 warnings.warn(
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51 (
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52 "SOCKS support in urllib3 requires the installation of optional "
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53 "dependencies: specifically, PySocks. For more information, see "
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54 "https://urllib3.readthedocs.io/en/latest/contrib.html#socks-proxies"
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55 ),
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56 DependencyWarning,
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57 )
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58 raise
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59
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60 from socket import error as SocketError
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61 from socket import timeout as SocketTimeout
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62
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63 from ..connection import HTTPConnection, HTTPSConnection
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64 from ..connectionpool import HTTPConnectionPool, HTTPSConnectionPool
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65 from ..exceptions import ConnectTimeoutError, NewConnectionError
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66 from ..poolmanager import PoolManager
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67 from ..util.url import parse_url
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68
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69 try:
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70 import ssl
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71 except ImportError:
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72 ssl = None
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73
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74
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75 class SOCKSConnection(HTTPConnection):
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76 """
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77 A plain-text HTTP connection that connects via a SOCKS proxy.
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78 """
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79
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80 def __init__(self, *args, **kwargs):
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81 self._socks_options = kwargs.pop("_socks_options")
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82 super(SOCKSConnection, self).__init__(*args, **kwargs)
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83
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84 def _new_conn(self):
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85 """
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86 Establish a new connection via the SOCKS proxy.
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87 """
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88 extra_kw = {}
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89 if self.source_address:
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90 extra_kw["source_address"] = self.source_address
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91
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92 if self.socket_options:
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93 extra_kw["socket_options"] = self.socket_options
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94
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95 try:
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96 conn = socks.create_connection(
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97 (self.host, self.port),
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98 proxy_type=self._socks_options["socks_version"],
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99 proxy_addr=self._socks_options["proxy_host"],
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100 proxy_port=self._socks_options["proxy_port"],
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101 proxy_username=self._socks_options["username"],
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102 proxy_password=self._socks_options["password"],
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103 proxy_rdns=self._socks_options["rdns"],
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104 timeout=self.timeout,
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105 **extra_kw
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106 )
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107
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108 except SocketTimeout:
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109 raise ConnectTimeoutError(
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110 self,
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111 "Connection to %s timed out. (connect timeout=%s)"
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112 % (self.host, self.timeout),
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113 )
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114
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115 except socks.ProxyError as e:
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116 # This is fragile as hell, but it seems to be the only way to raise
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117 # useful errors here.
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118 if e.socket_err:
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119 error = e.socket_err
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120 if isinstance(error, SocketTimeout):
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121 raise ConnectTimeoutError(
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122 self,
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123 "Connection to %s timed out. (connect timeout=%s)"
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124 % (self.host, self.timeout),
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125 )
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126 else:
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127 raise NewConnectionError(
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128 self, "Failed to establish a new connection: %s" % error
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129 )
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130 else:
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131 raise NewConnectionError(
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132 self, "Failed to establish a new connection: %s" % e
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133 )
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134
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135 except SocketError as e: # Defensive: PySocks should catch all these.
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136 raise NewConnectionError(
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137 self, "Failed to establish a new connection: %s" % e
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138 )
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139
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140 return conn
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141
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142
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143 # We don't need to duplicate the Verified/Unverified distinction from
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144 # urllib3/connection.py here because the HTTPSConnection will already have been
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145 # correctly set to either the Verified or Unverified form by that module. This
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146 # means the SOCKSHTTPSConnection will automatically be the correct type.
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147 class SOCKSHTTPSConnection(SOCKSConnection, HTTPSConnection):
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148 pass
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149
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150
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151 class SOCKSHTTPConnectionPool(HTTPConnectionPool):
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152 ConnectionCls = SOCKSConnection
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153
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154
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155 class SOCKSHTTPSConnectionPool(HTTPSConnectionPool):
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156 ConnectionCls = SOCKSHTTPSConnection
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157
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158
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159 class SOCKSProxyManager(PoolManager):
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160 """
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161 A version of the urllib3 ProxyManager that routes connections via the
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162 defined SOCKS proxy.
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163 """
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164
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165 pool_classes_by_scheme = {
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166 "http": SOCKSHTTPConnectionPool,
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167 "https": SOCKSHTTPSConnectionPool,
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168 }
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169
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170 def __init__(
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171 self,
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172 proxy_url,
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173 username=None,
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174 password=None,
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175 num_pools=10,
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176 headers=None,
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177 **connection_pool_kw
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178 ):
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179 parsed = parse_url(proxy_url)
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180
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181 if username is None and password is None and parsed.auth is not None:
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182 split = parsed.auth.split(":")
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183 if len(split) == 2:
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184 username, password = split
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185 if parsed.scheme == "socks5":
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186 socks_version = socks.PROXY_TYPE_SOCKS5
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187 rdns = False
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188 elif parsed.scheme == "socks5h":
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189 socks_version = socks.PROXY_TYPE_SOCKS5
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190 rdns = True
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191 elif parsed.scheme == "socks4":
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192 socks_version = socks.PROXY_TYPE_SOCKS4
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193 rdns = False
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194 elif parsed.scheme == "socks4a":
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195 socks_version = socks.PROXY_TYPE_SOCKS4
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196 rdns = True
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197 else:
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198 raise ValueError("Unable to determine SOCKS version from %s" % proxy_url)
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199
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200 self.proxy_url = proxy_url
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201
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202 socks_options = {
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203 "socks_version": socks_version,
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204 "proxy_host": parsed.host,
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205 "proxy_port": parsed.port,
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206 "username": username,
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207 "password": password,
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208 "rdns": rdns,
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209 }
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210 connection_pool_kw["_socks_options"] = socks_options
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211
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212 super(SOCKSProxyManager, self).__init__(
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213 num_pools, headers, **connection_pool_kw
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214 )
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215
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216 self.pool_classes_by_scheme = SOCKSProxyManager.pool_classes_by_scheme