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annotate sat/core/patches.py @ 2957:8fd8c9f548cd

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doc (jp/common_arguments): typo
author Goffi <goffi@goffi.org>
date Sun, 26 May 2019 22:30:09 +0200
parents 00d905e1b0ef
children ab2696e34d29
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2809
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1 import copy
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2 from twisted.words.protocols.jabber import xmlstream, sasl, client as tclient, jid
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3 from twisted.internet import ssl
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4 from wokkel import client
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5 from sat.core.constants import Const as C
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6 from sat.core.log import getLogger
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7
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8 log = getLogger(__name__)
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9
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10 """This module apply monkey patches to Twisted and Wokkel
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11 First part handle certificate validation during XMPP connectionand are temporary
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12 (until merged upstream).
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13 Second part add a trigger point to send and onElement method of XmlStream
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14 """
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15
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16
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17 ## certificate validation patches
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18
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19 class TLSInitiatingInitializer(xmlstream.TLSInitiatingInitializer):
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20 check_certificate = True
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21
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22 def onProceed(self, obj):
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23 self.xmlstream.removeObserver('/failure', self.onFailure)
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24 trustRoot = ssl.platformTrust() if self.check_certificate else None
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25 ctx = ssl.CertificateOptions(trustRoot=trustRoot)
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26 self.xmlstream.transport.startTLS(ctx)
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27 self.xmlstream.reset()
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28 self.xmlstream.sendHeader()
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29 self._deferred.callback(xmlstream.Reset)
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30
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31
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32 class XMPPClient(client.XMPPClient):
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33
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34 def __init__(self, jid, password, host=None, port=5222,
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35 check_certificate=True):
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36 self.jid = jid
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37 self.domain = jid.host.encode('idna')
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38 self.host = host
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39 self.port = port
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40
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41 factory = HybridClientFactory(
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42 jid, password, check_certificate=check_certificate)
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43
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44 client.StreamManager.__init__(self, factory)
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45
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46
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47 def HybridClientFactory(jid, password, check_certificate=True):
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48 a = HybridAuthenticator(jid, password, check_certificate)
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49
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50 return xmlstream.XmlStreamFactory(a)
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51
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52
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53 class HybridAuthenticator(client.HybridAuthenticator):
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54 res_binding = True
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55
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56 def __init__(self, jid, password, check_certificate):
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57 xmlstream.ConnectAuthenticator.__init__(self, jid.host)
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58 self.jid = jid
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59 self.password = password
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60 self.check_certificate = check_certificate
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61
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62 def associateWithStream(self, xs):
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63 xmlstream.ConnectAuthenticator.associateWithStream(self, xs)
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64
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65 tlsInit = xmlstream.TLSInitiatingInitializer(xs)
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66 tlsInit.check_certificate = self.check_certificate
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67 xs.initializers = [client.client.CheckVersionInitializer(xs),
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68 tlsInit,
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69 CheckAuthInitializer(xs, self.res_binding)]
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70
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71
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72 # XmlStream triggers
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73
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74
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75 class XmlStream(xmlstream.XmlStream):
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76 """XmlStream which allows to add hooks"""
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77
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78 def __init__(self, authenticator):
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79 xmlstream.XmlStream.__init__(self, authenticator)
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80 # hooks at this level should not modify content
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81 # so it's not needed to handle priority as with triggers
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82 self._onElementHooks = []
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83 self._sendHooks = []
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84
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85 def addHook(self, hook_type, callback):
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86 """Add a send or receive hook"""
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87 conflict_msg = (u"Hook conflict: can't add {hook_type} hook {callback}"
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88 .format(hook_type=hook_type, callback=callback))
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89 if hook_type == C.STREAM_HOOK_RECEIVE:
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90 if callback not in self._onElementHooks:
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91 self._onElementHooks.append(callback)
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92 else:
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93 log.warning(conflict_msg)
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94 elif hook_type == C.STREAM_HOOK_SEND:
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95 if callback not in self._sendHooks:
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96 self._sendHooks.append(callback)
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97 else:
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98 log.warning(conflict_msg)
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99 else:
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100 raise ValueError(u"Invalid hook type: {hook_type}"
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101 .format(hook_type=hook_type))
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102
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103 def onElement(self, element):
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104 for hook in self._onElementHooks:
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105 hook(element)
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106 xmlstream.XmlStream.onElement(self, element)
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107
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108 def send(self, obj):
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109 for hook in self._sendHooks:
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110 hook(obj)
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111 xmlstream.XmlStream.send(self, obj)
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112
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113
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114 # Binding activation (needed for stream management, XEP-0198)
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115
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116
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117 class CheckAuthInitializer(client.CheckAuthInitializer):
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118
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119 def __init__(self, xs, res_binding):
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120 super(CheckAuthInitializer, self).__init__(xs)
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121 self.res_binding = res_binding
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122
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123 def initialize(self):
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124 # XXX: modification of client.CheckAuthInitializer which has optional
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125 # resource binding, and which doesn't do deprecated
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126 # SessionInitializer
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127 if (sasl.NS_XMPP_SASL, 'mechanisms') in self.xmlstream.features:
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128 inits = [(sasl.SASLInitiatingInitializer, True)]
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129 if self.res_binding:
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130 inits.append((tclient.BindInitializer, True)),
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131
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132 for initClass, required in inits:
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133 init = initClass(self.xmlstream)
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134 init.required = required
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135 self.xmlstream.initializers.append(init)
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136 elif (tclient.NS_IQ_AUTH_FEATURE, 'auth') in self.xmlstream.features:
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137 self.xmlstream.initializers.append(
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138 tclient.IQAuthInitializer(self.xmlstream))
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139 else:
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140 raise Exception("No available authentication method found")
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141
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142
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143 # jid fix
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144
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145 def internJID(jidstring):
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146 """
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147 Return interned JID.
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148
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149 @rtype: L{JID}
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150 """
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151 # XXX: this interJID return a copy of the cached jid
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152 # this avoid modification of cached jid as JID is mutable
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153 # TODO: propose this upstream
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154
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155 if jidstring in jid.__internJIDs:
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156 return copy.copy(jid.__internJIDs[jidstring])
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157 else:
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158 j = jid.JID(jidstring)
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159 jid.__internJIDs[jidstring] = j
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160 return copy.copy(j)
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161
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162
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163 def apply():
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164 # certificate validation
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165 xmlstream.TLSInitiatingInitializer = TLSInitiatingInitializer
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166 client.XMPPClient = XMPPClient
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167 # XmlStream triggers
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168 xmlstream.XmlStreamFactory.protocol = XmlStream
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169 # jid fix
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170 jid.internJID = internJID