E5Network/E5NetworkProxyFactory.py

Thu, 27 May 2010 20:27:46 +0200

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Thu, 27 May 2010 20:27:46 +0200
changeset 289
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parent 286
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child 317
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permissions
-rw-r--r--

Extended the proxy handling to HTTPS and FTP.

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1 # -*- coding: utf-8 -*-
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2
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3 # Copyright (c) 2010 Detlev Offenbach <detlev@die-offenbachs.de>
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4 #
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5
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6 """
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7 Module implementing a network proxy factory.
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8 """
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9
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10 import sys
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11 import os
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12
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13 from PyQt4.QtCore import QUrl, Qt, QCoreApplication
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14 from PyQt4.QtGui import QMessageBox, QDialog
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15 from PyQt4.QtNetwork import QNetworkProxyFactory, QNetworkProxy, QNetworkProxyQuery
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16
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17 from UI.AuthenticationDialog import AuthenticationDialog
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18
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19 import Preferences
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20
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21 def schemeFromProxyType(proxyType):
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22 """
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23 Module function to determine the scheme name from the proxy type.
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24
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25 @param proxyType type of the proxy (QNetworkProxy.ProxyType)
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26 @return scheme (string, one of Http, Https, Ftp)
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27 """
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28 scheme = ""
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29 if proxyType == QNetworkProxy.HttpProxy:
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30 scheme = "Http"
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31 elif proxyType == QNetworkProxy.HttpCachingProxy:
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32 scheme = "Https"
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33 elif proxyType == QNetworkProxy.FtpCachingProxy:
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34 scheme = "Ftp"
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35 elif proxyType == QNetworkProxy.NoProxy:
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36 scheme = "NoProxy"
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37 return scheme
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38
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39 def proxyAuthenticationRequired(proxy, auth):
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40 """
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41 Module slot to handle a proxy authentication request.
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42
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43 @param proxy reference to the proxy object (QNetworkProxy)
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44 @param auth reference to the authenticator object (QAuthenticator)
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45 """
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46 info = QCoreApplication.translate("E5NetworkProxyFactory",
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47 "<b>Connect to proxy '{0}' using:</b>")\
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48 .format(Qt.escape(proxy.hostName()))
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49
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50 dlg = AuthenticationDialog(info, proxy.user(), True)
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51 if dlg.exec_() == QDialog.Accepted:
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52 username, password = dlg.getData()
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53 auth.setUser(username)
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54 auth.setPassword(password)
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55 if dlg.shallSave():
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56 scheme = schemeFromProxyType(proxy.type())
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57 if scheme and scheme != "NoProxy":
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58 Preferences.setUI("ProxyUser/{0}".format(scheme), username)
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59 Preferences.setUI("ProxyPassword/{0}".format(scheme), password)
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60 proxy.setUser(username)
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61 proxy.setPassword(password)
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62
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63 class E5NetworkProxyFactory(QNetworkProxyFactory):
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64 """
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65 Class implementing a network proxy factory.
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66 """
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67 def __init__(self):
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68 """
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69 Constructor
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70 """
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71 QNetworkProxyFactory.__init__(self)
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72
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73 def queryProxy(self, query):
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74 """
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75 Public method to determine a proxy for a given query.
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76
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77 @param query reference to the query object (QNetworkProxyQuery)
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78 @return list of proxies in order of preference (list of QNetworkProxy)
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79 """
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80 if query.queryType() == QNetworkProxyQuery.UrlRequest and \
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81 query.protocolTag() in ["http", "https", "ftp"] and \
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82 Preferences.getUI("UseProxy"):
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83 if Preferences.getUI("UseSystemProxy"):
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84 proxyList = QNetworkProxyFactory.systemProxyForQuery(query)
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85 if sys.platform not in ["darwin", "nt"] and \
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86 len(proxyList) == 1 and \
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87 proxyList[0].type() == QNetworkProxy.NoProxy:
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88 # try it the Python way
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89 # scan the environment for variables named <scheme>_proxy
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90 # scan over whole environment to make this case insensitive
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91 for name, value in os.environ.items():
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92 name = name.lower()
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93 if value and name[-6:] == '_proxy' and \
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94 name[:-6] == query.protocolTag().lower():
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95 url = QUrl(value)
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96 if url.scheme() == "http":
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97 proxyType = QNetworkProxy.HttpProxy
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98 elif url.scheme() == "https":
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99 proxyType = QNetworkProxy.HttpCachingProxy
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100 elif url.scheme() == "ftp":
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101 proxyType = QNetworkProxy.FtpCachingProxy
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102 else:
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103 proxyType = QNetworkProxy.HttpProxy
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104 proxy = QNetworkProxy(proxyType, url.host(), url.port(),
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105 url.userName(), url.password())
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106 proxyList = [proxy]
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107 break
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108 scheme = schemeFromProxyType(proxyList[0].type())
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109 if scheme == "":
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110 scheme = "Http"
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111 if scheme != "NoProxy":
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112 proxyList[0].setUser(
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113 Preferences.getUI("ProxyUser/{0}".format(scheme)))
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114 proxyList[0].setPassword(
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115 Preferences.getUI("ProxyPassword/{0}".format(scheme)))
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116 return proxyList
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117 else:
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118 if Preferences.getUI("UseHttpProxyForAll"):
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119 protocol = "Http"
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120 else:
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121 protocol = query.protocolTag().capitalize()
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122 host = Preferences.getUI("ProxyHost/{0}".format(protocol))
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123 if not host:
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124 QMessageBox.critical(None,
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125 QCoreApplication.translate("E5NetworkProxyFactory",
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126 "Proxy Configuration Error"),
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127 QCoreApplication.translate("E5NetworkProxyFactory",
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128 """Proxy usage was activated"""
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129 """ but no proxy host for protocol"""
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130 """ '{0}' configured.""").format(protocol))
286
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131 return [QNetworkProxy(QNetworkProxy.DefaultProxy)]
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132 else:
289
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133 if protocol == "Http":
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134 proxy = QNetworkProxy(QNetworkProxy.HttpProxy, host,
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135 Preferences.getUI("ProxyPort/Http"),
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136 Preferences.getUI("ProxyUser/Http"),
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parents: 286
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137 Preferences.getUI("ProxyPassword/Http"))
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parents: 286
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138 elif protocol == "Https":
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parents: 286
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139 proxy = QNetworkProxy(QNetworkProxy.HttpCachingProxy, host,
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parents: 286
diff changeset
140 Preferences.getUI("ProxyPort/Https"),
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parents: 286
diff changeset
141 Preferences.getUI("ProxyUser/Https"),
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parents: 286
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142 Preferences.getUI("ProxyPassword/Https"))
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parents: 286
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143 elif protocol == "Ftp":
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parents: 286
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144 proxy = QNetworkProxy(QNetworkProxy.FtpCachingProxy, host,
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parents: 286
diff changeset
145 Preferences.getUI("ProxyPort/Ftp"),
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parents: 286
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146 Preferences.getUI("ProxyUser/Ftp"),
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parents: 286
diff changeset
147 Preferences.getUI("ProxyPassword/Ftp"))
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parents: 286
diff changeset
148 else:
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parents: 286
diff changeset
149 proxy = QNetworkProxy(QNetworkProxy.DefaultProxy)
286
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parents: 283
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150 return [proxy, QNetworkProxy(QNetworkProxy.DefaultProxy)]
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parents: 283
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151 else:
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parents: 283
diff changeset
152 return [QNetworkProxy(QNetworkProxy.NoProxy)]

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