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annotate sat/plugins/plugin_xep_0115.py @ 3215:bfa1bde97f48

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core (tools/utils): new `asDeferred` function: asDeferred is similar to defer.maybeCoroutine, and also handles coroutine.
author Goffi <goffi@goffi.org>
date Fri, 13 Mar 2020 17:46:27 +0100
parents 559a625a236b
children 6cf4bd6972c2
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1 #!/usr/bin/env python3
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2
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4 # SAT plugin for managing xep-0115
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5 # Copyright (C) 2009-2020 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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16
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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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23
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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 implementer
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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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53
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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(_("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(_("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 "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("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 @implementer(iwokkel.IDisco)
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119 class XEP_0115_handler(XMPPHandler):
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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 ]
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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 = next(presence.elements(NS_ENTITY_CAPABILITY, "c"))
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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(_("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 "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 "Unknown hash method for entity capabilities: [{hash_method}] "
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169 "(entity: {entity_jid}, node: {node})"
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170 )
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171 .format(hash_method = c_hash, entity_jid = from_jid, node = c_node)
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172 )
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173
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174 def cb(__):
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175 computed_hash = self.host.memory.getEntityDatum(
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176 from_jid, C.ENTITY_CAP_HASH, self.profile
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177 )
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178 if computed_hash != c_ver:
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179 log.warning(
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180 _(
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181 "Computed hash differ from given hash:\n"
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182 "given: [{given}]\n"
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183 "computed: [{computed}]\n"
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184 "(entity: {entity_jid}, node: {node})"
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185 ).format(
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186 given = c_ver,
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187 computed = computed_hash,
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188 entity_jid = from_jid,
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189 node = c_node,
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190 )
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191 )
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192
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193 def eb(failure):
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194 if isinstance(failure.value, error.ConnectionDone):
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195 return
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196 msg = (
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197 failure.value.condition
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198 if hasattr(failure.value, "condition")
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199 else failure.getErrorMessage()
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200 )
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201 log.error(
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202 _("Couldn't retrieve disco info for {jid}: {error}").format(
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203 jid=from_jid.full(), error=msg
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204 )
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205 )
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206
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207 d = self.host.getDiscoInfos(self.parent, from_jid)
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208 d.addCallbacks(cb, eb)
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209 # TODO: me must manage the full algorithm described at XEP-0115 #5.4 part 3