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annotate sat/plugins/plugin_xep_0115.py @ 3237:b0c57c9a4bd8

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plugin XEP-0384: OMEMO trust policy: OMEMO trust policy can now be specified. For now there are 2 policies: - `manual`: each new device fingerprint must be explicitly trusted or not before the device can be used, and the message sent - `BTBV` (Blind Trust Before Verification): each new device fingerprint is automically trusted, until user manually trust or not a device, in which case the behaviour becomes the same as for `manual` for the entity. When using the Trust UI, user can put the entity back to blind trust if they wish. A message is send as feedback to user when a new device is/must be trusted, trying to explain clearly what's happening to the user. Devices which have been automically trusted are marked, so user can know which ones may cause security issue.
author Goffi <goffi@goffi.org>
date Fri, 27 Mar 2020 10:02:14 +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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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 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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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 ]
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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Goffi <goffi@goffi.org>
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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
282
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143 """
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144 from_jid = jid.JID(presence["from"])
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Goffi <goffi@goffi.org>
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145 c_elem = next(presence.elements(NS_ENTITY_CAPABILITY, "c"))
282
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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"]
282
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150 except KeyError:
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151 log.warning(_("Received invalid capabilities tag: %s") % c_elem.toXml())
282
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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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parents: 2587
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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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souliane <souliane@mailoo.org>
parents: 1232
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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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diff changeset
177 )
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souliane <souliane@mailoo.org>
parents: 1232
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178 if computed_hash != c_ver:
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179 log.warning(
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diff changeset
180 _(
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181 "Computed hash differ from given hash:\n"
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Goffi <goffi@goffi.org>
parents: 2830
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182 "given: [{given}]\n"
ab2696e34d29 Python 3 port:
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diff changeset
183 "computed: [{computed}]\n"
ab2696e34d29 Python 3 port:
Goffi <goffi@goffi.org>
parents: 2830
diff changeset
184 "(entity: {entity_jid}, node: {node})"
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Goffi <goffi@goffi.org>
parents: 2771
diff changeset
185 ).format(
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Goffi <goffi@goffi.org>
parents: 2771
diff changeset
186 given = c_ver,
770ec685ff1f core (disco): added missing disco extensions when generating the cap hash.
Goffi <goffi@goffi.org>
parents: 2771
diff changeset
187 computed = computed_hash,
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Goffi <goffi@goffi.org>
parents: 2771
diff changeset
188 entity_jid = from_jid,
770ec685ff1f core (disco): added missing disco extensions when generating the cap hash.
Goffi <goffi@goffi.org>
parents: 2771
diff changeset
189 node = c_node,
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190 )
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parents: 2587
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191 )
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parents: 941
diff changeset
192
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souliane <souliane@mailoo.org>
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diff changeset
193 def eb(failure):
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souliane <souliane@mailoo.org>
parents: 1232
diff changeset
194 if isinstance(failure.value, error.ConnectionDone):
c3884a63efde plugin XEP-0115: better disco error handling
souliane <souliane@mailoo.org>
parents: 1232
diff changeset
195 return
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196 msg = (
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diff changeset
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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parents: 2587
diff changeset
201 log.error(
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ab2696e34d29 Python 3 port:
Goffi <goffi@goffi.org>
parents: 2830
diff changeset
202 _("Couldn't retrieve disco info for {jid}: {error}").format(
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parents: 2587
diff changeset
203 jid=from_jid.full(), error=msg
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204 )
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parents: 2587
diff changeset
205 )
1244
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souliane <souliane@mailoo.org>
parents: 1232
diff changeset
206
2148
a543eda2c923 core (memory/disco): getInfos now handle node + use client instead of profile in many methods
Goffi <goffi@goffi.org>
parents: 2145
diff changeset
207 d = self.host.getDiscoInfos(self.parent, from_jid)
1244
c3884a63efde plugin XEP-0115: better disco error handling
souliane <souliane@mailoo.org>
parents: 1232
diff changeset
208 d.addCallbacks(cb, eb)
944
e1842ebcb2f3 core, plugin XEP-0115: discovery refactoring:
Goffi <goffi@goffi.org>
parents: 941
diff changeset
209 # TODO: me must manage the full algorithm described at XEP-0115 #5.4 part 3