Mercurial > libervia-backend

annotate sat/plugins/plugin_xep_0115.py @ 2646:712cb4ff3e13

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core: new EncryptionHandler class which manage encrypted session as a core feature: Plugin handling encryption can now register using host.registerEncryptionPlugin, and an encryption session can now be started using messageEncryptionStart bridge method. This will make encryption handling more easy, as we now know if a session is clear or e2e encrypted, and which plugin handle it.
author Goffi <goffi@goffi.org>
date Sun, 29 Jul 2018 19:22:56 +0200
parents 56f94936df1e
children 378188abe941
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rev   line source
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1 #!/usr/bin/env python2
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT plugin for managing xep-0115
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5 # Copyright (C) 2009-2018 Jérôme Poisson (goffi@goffi.org)
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 from sat.core.i18n import _
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21 from sat.core.constants import Const as C
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22 from sat.core.log import getLogger
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24 log = getLogger(__name__)
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25 from twisted.words.xish import domish
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26 from twisted.words.protocols.jabber import jid
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27 from twisted.internet import defer, error
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28 from zope.interface import implements
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29 from wokkel import disco, iwokkel
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31 try:
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32 from twisted.words.protocols.xmlstream import XMPPHandler
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33 except ImportError:
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34 from wokkel.subprotocols import XMPPHandler
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35
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36 PRESENCE = "/presence"
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37 NS_ENTITY_CAPABILITY = "http://jabber.org/protocol/caps"
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38 NS_CAPS_OPTIMIZE = "http://jabber.org/protocol/caps#optimize"
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39 CAPABILITY_UPDATE = PRESENCE + '/c[@xmlns="' + NS_ENTITY_CAPABILITY + '"]'
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41 PLUGIN_INFO = {
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42 C.PI_NAME: "XEP 0115 Plugin",
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43 C.PI_IMPORT_NAME: "XEP-0115",
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44 C.PI_TYPE: "XEP",
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45 C.PI_MODES: C.PLUG_MODE_BOTH,
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46 C.PI_PROTOCOLS: ["XEP-0115"],
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47 C.PI_DEPENDENCIES: [],
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48 C.PI_MAIN: "XEP_0115",
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49 C.PI_HANDLER: "yes",
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50 C.PI_DESCRIPTION: _("""Implementation of entity capabilities"""),
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51 }
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54 class XEP_0115(object):
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55 cap_hash = None # capabilities hash is class variable as it is common to all profiles
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57 def __init__(self, host):
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58 log.info(_("Plugin XEP_0115 initialization"))
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59 self.host = host
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60 host.trigger.add("Presence send", self._presenceTrigger)
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61
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62 def getHandler(self, client):
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63 return XEP_0115_handler(self, client.profile)
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64
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65 @defer.inlineCallbacks
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66 def _prepareCaps(self, client):
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67 # we have to calculate hash for client
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68 # because disco infos/identities may change between clients
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69
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70 # optimize check
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71 client._caps_optimize = yield self.host.hasFeature(client, NS_CAPS_OPTIMIZE)
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72 if client._caps_optimize:
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73 log.info(_(u"Caps optimisation enabled"))
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74 client._caps_sent = False
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75 else:
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76 log.warning(_(u"Caps optimisation not available"))
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77
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78 # hash generation
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79 _infos = yield client.discoHandler.info(client.jid, client.jid, "")
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80 disco_infos = disco.DiscoInfo()
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81 for item in _infos:
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82 disco_infos.append(item)
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83 cap_hash = client._caps_hash = self.host.memory.disco.generateHash(disco_infos)
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84 log.info(
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85 u"Our capability hash has been generated: [{cap_hash}]".format(
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86 cap_hash=cap_hash
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87 )
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88 )
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89 log.debug(u"Generating capability domish.Element")
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90 c_elt = domish.Element((NS_ENTITY_CAPABILITY, "c"))
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91 c_elt["hash"] = "sha-1"
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92 c_elt["node"] = C.APP_URL
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93 c_elt["ver"] = cap_hash
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94 client._caps_elt = c_elt
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95 if client._caps_optimize:
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96 client._caps_sent = False
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97 if cap_hash not in self.host.memory.disco.hashes:
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98 self.host.memory.disco.hashes[cap_hash] = disco_infos
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99 self.host.memory.updateEntityData(
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100 client.jid, C.ENTITY_CAP_HASH, cap_hash, profile_key=client.profile
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101 )
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102
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103 def _presenceAddElt(self, client, obj):
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104 if client._caps_optimize:
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105 if client._caps_sent:
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106 return
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107 client.caps_sent = True
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108 obj.addChild(client._caps_elt)
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109
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110 def _presenceTrigger(self, client, obj, presence_d):
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111 if not hasattr(client, "_caps_optimize"):
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112 presence_d.addCallback(lambda __: self._prepareCaps(client))
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113
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114 presence_d.addCallback(lambda __: self._presenceAddElt(client, obj))
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115 return True
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116
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117
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118 class XEP_0115_handler(XMPPHandler):
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119 implements(iwokkel.IDisco)
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120
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121 def __init__(self, plugin_parent, profile):
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122 self.plugin_parent = plugin_parent
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123 self.host = plugin_parent.host
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124 self.profile = profile
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125
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126 def connectionInitialized(self):
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127 self.xmlstream.addObserver(CAPABILITY_UPDATE, self.update)
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128
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129 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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130 return [
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131 disco.DiscoFeature(NS_ENTITY_CAPABILITY),
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132 disco.DiscoFeature(NS_CAPS_OPTIMIZE),
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133 ]
282
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134
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135 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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136 return []
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137
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138 def update(self, presence):
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139 """
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140 Manage the capabilities of the entity
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141
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142 Check if we know the version of this capabilities and get the capabilities if necessary
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143 """
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144 from_jid = jid.JID(presence["from"])
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145 c_elem = presence.elements(NS_ENTITY_CAPABILITY, "c").next()
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146 try:
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147 c_ver = c_elem["ver"]
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148 c_hash = c_elem["hash"]
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149 c_node = c_elem["node"]
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150 except KeyError:
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151 log.warning(_(u"Received invalid capabilities tag: %s") % c_elem.toXml())
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152 return
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153
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154 if c_ver in self.host.memory.disco.hashes:
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155 # we already know the hash, we update the jid entity
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156 log.debug(
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157 u"hash [%(hash)s] already in cache, updating entity [%(jid)s]"
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158 % {"hash": c_ver, "jid": from_jid.full()}
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159 )
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160 self.host.memory.updateEntityData(
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161 from_jid, C.ENTITY_CAP_HASH, c_ver, profile_key=self.profile
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162 )
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163 return
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164
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165 if c_hash != "sha-1": # unknown hash method
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166 log.warning(
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167 _(
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168 u"Unknown hash method for entity capabilities: [%(hash_method)s] (entity: %(jid)s, node: %(node)s)"
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169 )
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170 % {"hash_method": c_hash, "jid": from_jid, "node": c_node}
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171 )
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172
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173 def cb(dummy):
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174 computed_hash = self.host.memory.getEntityDatum(
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175 from_jid, C.ENTITY_CAP_HASH, self.profile
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176 )
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souliane <souliane@mailoo.org>
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177 if computed_hash != c_ver:
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178 log.warning(
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179 _(
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180 u"Computed hash differ from given hash:\ngiven: [%(given_hash)s]\ncomputed: [%(computed_hash)s]\n(entity: %(jid)s, node: %(node)s)"
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181 )
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182 % {
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183 "given_hash": c_ver,
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184 "computed_hash": computed_hash,
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185 "jid": from_jid,
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186 "node": c_node,
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187 }
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188 )
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189
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190 def eb(failure):
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souliane <souliane@mailoo.org>
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191 if isinstance(failure.value, error.ConnectionDone):
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192 return
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193 msg = (
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194 failure.value.condition
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195 if hasattr(failure.value, "condition")
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196 else failure.getErrorMessage()
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197 )
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198 log.error(
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199 _(u"Couldn't retrieve disco info for {jid}: {error}").format(
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200 jid=from_jid.full(), error=msg
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201 )
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parents: 2587
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202 )
1244
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souliane <souliane@mailoo.org>
parents: 1232
diff changeset
203
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Goffi <goffi@goffi.org>
parents: 2145
diff changeset
204 d = self.host.getDiscoInfos(self.parent, from_jid)
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souliane <souliane@mailoo.org>
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diff changeset
205 d.addCallbacks(cb, eb)
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parents: 941
diff changeset
206 # TODO: me must manage the full algorithm described at XEP-0115 #5.4 part 3