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annotate sat/core/patches.py @ 2845:42380a4f6433

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quick frontend (app): new synchronisation mechanism: on some frontend (notably on mobiles) frontend can be paused and lose synchronisation with backend, this can also happen if backend restart a connexion without resuming using stream management. To manage that, QuickApp now has a sync attribute which is True when the backend is in sync with frontend. When synchronisation has been lost and is possible again, all widget will have their "resync" method called, which can be used to do necessary calls to update the status. It's the responsability of each widget to then reset the "sync" attribute, once everything has been resynchronised.
author Goffi <goffi@goffi.org>
date Sat, 09 Mar 2019 16:33:31 +0100
parents 00d905e1b0ef
children ab2696e34d29
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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