Mercurial > libervia-backend

annotate sat/core/patches.py @ 3054:92f8baec5e4f

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doc (jp): typos (thanks tbart)
author Goffi <goffi@goffi.org>
date Fri, 11 Oct 2019 16:15:09 +0200
parents 691283719bb2
children 524856bd7b19
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rev   line source
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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 wokkel import client
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4 from sat.core.constants import Const as C
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5 from sat.core.log import getLogger
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6
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7 log = getLogger(__name__)
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8
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9 """This module applies monkey patches to Twisted and Wokkel
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10 First part handle certificate validation during XMPP connectionand are temporary
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11 (until merged upstream).
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12 Second part add a trigger point to send and onElement method of XmlStream
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13 """
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14
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15
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16 ## certificate validation patches
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17
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18
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19 class XMPPClient(client.XMPPClient):
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20
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21 def __init__(self, jid, password, host=None, port=5222,
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22 tls_required=True, configurationForTLS=None):
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23 self.jid = jid
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24 self.domain = jid.host.encode('idna')
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25 self.host = host
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26 self.port = port
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27
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28 factory = HybridClientFactory(
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29 jid, password, tls_required=tls_required,
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30 configurationForTLS=configurationForTLS)
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31
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32 client.StreamManager.__init__(self, factory)
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33
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34
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35 def HybridClientFactory(jid, password, tls_required=True, configurationForTLS=None):
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36 a = HybridAuthenticator(jid, password, tls_required, configurationForTLS)
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37
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38 return xmlstream.XmlStreamFactory(a)
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39
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40
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41 class HybridAuthenticator(client.HybridAuthenticator):
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42 res_binding = True
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43
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44 def __init__(self, jid, password, tls_required=True, configurationForTLS=None):
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45 xmlstream.ConnectAuthenticator.__init__(self, jid.host)
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46 self.jid = jid
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47 self.password = password
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48 self.tls_required = tls_required
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49 self.configurationForTLS = configurationForTLS
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50
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51 def associateWithStream(self, xs):
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52 xmlstream.ConnectAuthenticator.associateWithStream(self, xs)
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53
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54 tlsInit = xmlstream.TLSInitiatingInitializer(
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55 xs, required=self.tls_required, configurationForTLS=self.configurationForTLS)
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56 xs.initializers = [client.client.CheckVersionInitializer(xs),
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57 tlsInit,
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58 CheckAuthInitializer(xs, self.res_binding)]
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59
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60
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61 # XmlStream triggers
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62
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63
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64 class XmlStream(xmlstream.XmlStream):
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65 """XmlStream which allows to add hooks"""
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66
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67 def __init__(self, authenticator):
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68 xmlstream.XmlStream.__init__(self, authenticator)
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69 # hooks at this level should not modify content
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70 # so it's not needed to handle priority as with triggers
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71 self._onElementHooks = []
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72 self._sendHooks = []
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73
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74 def addHook(self, hook_type, callback):
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75 """Add a send or receive hook"""
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76 conflict_msg = f"Hook conflict: can't add {hook_type} hook {callback}"
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77 if hook_type == C.STREAM_HOOK_RECEIVE:
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78 if callback not in self._onElementHooks:
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79 self._onElementHooks.append(callback)
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80 else:
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81 log.warning(conflict_msg)
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82 elif hook_type == C.STREAM_HOOK_SEND:
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83 if callback not in self._sendHooks:
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84 self._sendHooks.append(callback)
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85 else:
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86 log.warning(conflict_msg)
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87 else:
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88 raise ValueError(f"Invalid hook type: {hook_type}")
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89
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90 def onElement(self, element):
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91 for hook in self._onElementHooks:
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92 hook(element)
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93 xmlstream.XmlStream.onElement(self, element)
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94
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95 def send(self, obj):
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96 for hook in self._sendHooks:
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97 hook(obj)
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98 xmlstream.XmlStream.send(self, obj)
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99
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100
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101 # Binding activation (needed for stream management, XEP-0198)
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102
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103
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104 class CheckAuthInitializer(client.CheckAuthInitializer):
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105
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106 def __init__(self, xs, res_binding):
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107 super(CheckAuthInitializer, self).__init__(xs)
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108 self.res_binding = res_binding
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109
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110 def initialize(self):
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111 # XXX: modification of client.CheckAuthInitializer which has optional
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112 # resource binding, and which doesn't do deprecated
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113 # SessionInitializer
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114 if (sasl.NS_XMPP_SASL, 'mechanisms') in self.xmlstream.features:
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115 inits = [(sasl.SASLInitiatingInitializer, True)]
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116 if self.res_binding:
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117 inits.append((tclient.BindInitializer, True)),
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118
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119 for initClass, required in inits:
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120 init = initClass(self.xmlstream)
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121 init.required = required
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122 self.xmlstream.initializers.append(init)
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123 elif (tclient.NS_IQ_AUTH_FEATURE, 'auth') in self.xmlstream.features:
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124 self.xmlstream.initializers.append(
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125 tclient.IQAuthInitializer(self.xmlstream))
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126 else:
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127 raise Exception("No available authentication method found")
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128
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129
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130 # jid fix
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131
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132 def internJID(jidstring):
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133 """
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134 Return interned JID.
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135
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136 @rtype: L{JID}
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137 """
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138 # XXX: this interJID return a copy of the cached jid
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139 # this avoid modification of cached jid as JID is mutable
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140 # TODO: propose this upstream
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141
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142 if jidstring in jid.__internJIDs:
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143 return copy.copy(jid.__internJIDs[jidstring])
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144 else:
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145 j = jid.JID(jidstring)
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146 jid.__internJIDs[jidstring] = j
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147 return copy.copy(j)
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148
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149
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150 def apply():
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151 # certificate validation
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152 client.XMPPClient = XMPPClient
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153 # XmlStream triggers
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154 xmlstream.XmlStreamFactory.protocol = XmlStream
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155 # jid fix
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156 jid.internJID = internJID