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annotate sat/plugins/plugin_xep_0033.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
1934
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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 Extended Stanza Addressing (xep-0033)
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5 # Copyright (C) 2013-2016 Adrien Cossa (souliane@mailoo.org)
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6
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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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11
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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 sat.core import exceptions
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26 from wokkel import disco, iwokkel
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27 from zope.interface import implements
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28 from twisted.words.protocols.jabber.jid import JID
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29 from twisted.python import failure
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30 import copy
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31
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32 try:
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33 from twisted.words.protocols.xmlstream import XMPPHandler
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34 except ImportError:
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35 from wokkel.subprotocols import XMPPHandler
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36 from twisted.words.xish import domish
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37 from twisted.internet import defer
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38
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39 from sat.tools import trigger
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40 from time import time
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41
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42 # TODO: fix Prosody "addressing" plugin to leave the concerned bcc according to the spec:
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43 #
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44 # http://xmpp.org/extensions/xep-0033.html#addr-type-bcc
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45 # "This means that the server MUST remove these addresses before the stanza is delivered to anyone other than the given bcc addressee or the multicast service of the bcc addressee."
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46 #
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47 # http://xmpp.org/extensions/xep-0033.html#multicast
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48 # "Each 'bcc' recipient MUST receive only the <address type='bcc'/> associated with that addressee."
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49
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50 # TODO: fix Prosody "addressing" plugin to determine itself if remote servers supports this XEP
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52
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53 NS_XMPP_CLIENT = "jabber:client"
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54 NS_ADDRESS = "http://jabber.org/protocol/address"
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55 ATTRIBUTES = ["jid", "uri", "node", "desc", "delivered", "type"]
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56 ADDRESS_TYPES = ["to", "cc", "bcc", "replyto", "replyroom", "noreply"]
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57
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58 PLUGIN_INFO = {
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59 C.PI_NAME: "Extended Stanza Addressing Protocol Plugin",
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60 C.PI_IMPORT_NAME: "XEP-0033",
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61 C.PI_TYPE: "XEP",
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62 C.PI_PROTOCOLS: ["XEP-0033"],
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63 C.PI_DEPENDENCIES: [],
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64 C.PI_MAIN: "XEP_0033",
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65 C.PI_HANDLER: "yes",
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66 C.PI_DESCRIPTION: _("""Implementation of Extended Stanza Addressing"""),
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67 }
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68
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69
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70 class XEP_0033(object):
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71 """
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72 Implementation for XEP 0033
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73 """
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74
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75 def __init__(self, host):
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76 log.info(_("Extended Stanza Addressing plugin initialization"))
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77 self.host = host
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78 self.internal_data = {}
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79 host.trigger.add(
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80 "sendMessage", self.sendMessageTrigger, trigger.TriggerManager.MIN_PRIORITY
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81 )
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82 host.trigger.add("MessageReceived", self.messageReceivedTrigger)
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83
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84 def sendMessageTrigger(
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85 self, client, mess_data, pre_xml_treatments, post_xml_treatments
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86 ):
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87 """Process the XEP-0033 related data to be sent"""
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88 profile = client.profile
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89
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90 def treatment(mess_data):
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91 if not "address" in mess_data["extra"]:
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92 return mess_data
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93
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94 def discoCallback(entities):
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95 if not entities:
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96 log.warning(
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97 _("XEP-0033 is being used but the server doesn't support it!")
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98 )
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99 raise failure.Failure(
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100 exceptions.CancelError(u"Cancelled by XEP-0033")
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101 )
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102 if mess_data["to"] not in entities:
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103 expected = _(" or ").join([entity.userhost() for entity in entities])
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104 log.warning(
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105 _(
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106 u"Stanzas using XEP-0033 should be addressed to %(expected)s, not %(current)s!"
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107 )
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108 % {"expected": expected, "current": mess_data["to"]}
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109 )
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110 log.warning(
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111 _(
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112 u"TODO: addressing has been fixed by the backend... fix it in the frontend!"
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113 )
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114 )
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115 mess_data["to"] = list(entities)[0].userhostJID()
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116 element = mess_data["xml"].addElement("addresses", NS_ADDRESS)
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117 entries = [
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118 entry.split(":")
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119 for entry in mess_data["extra"]["address"].split("\n")
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120 if entry != ""
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121 ]
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122 for type_, jid_ in entries:
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123 element.addChild(
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124 domish.Element(
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125 (None, "address"), None, {"type": type_, "jid": jid_}
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126 )
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127 )
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128 # when the prosody plugin is completed, we can immediately return mess_data from here
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129 self.sendAndStoreMessage(mess_data, entries, profile)
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130 log.debug("XEP-0033 took over")
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131 raise failure.Failure(exceptions.CancelError(u"Cancelled by XEP-0033"))
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132
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133 d = self.host.findFeaturesSet(client, [NS_ADDRESS])
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134 d.addCallbacks(discoCallback, lambda dummy: discoCallback(None))
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135 return d
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136
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137 post_xml_treatments.addCallback(treatment)
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138 return True
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139
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140 def sendAndStoreMessage(self, mess_data, entries, profile):
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141 """Check if target servers support XEP-0033, send and store the messages
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142 @return: a friendly failure to let the core know that we sent the message already
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143
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144 Later we should be able to remove this method because:
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145 # XXX: sending the messages should be done by the local server
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146 # FIXME: for now we duplicate the messages in the history for each recipient, this should change
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147 # FIXME: for now we duplicate the echoes to the sender, this should also change
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148 Ideas:
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149 - fix Prosody plugin to check if target server support the feature
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150 - redesign the database to save only one entry to the database
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151 - change the messageNew signal to eventually pass more than one recipient
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152 """
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153 client = self.host.getClient(profile)
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154
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155 def send(mess_data, skip_send=False):
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156 d = defer.Deferred()
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157 if not skip_send:
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158 d.addCallback(client.sendMessageData)
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159 d.addCallback(client.messageAddToHistory)
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160 d.addCallback(client.messageSendToBridge)
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161 d.addErrback(lambda failure: failure.trap(exceptions.CancelError))
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162 return d.callback(mess_data)
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163
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164 def discoCallback(entities, to_jid_s):
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165 history_data = copy.deepcopy(mess_data)
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166 history_data["to"] = JID(to_jid_s)
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167 history_data["xml"]["to"] = to_jid_s
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168 if entities:
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169 if entities not in self.internal_data[timestamp]:
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170 sent_data = copy.deepcopy(mess_data)
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171 sent_data["to"] = JID(JID(to_jid_s).host)
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172 sent_data["xml"]["to"] = JID(to_jid_s).host
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173 send(sent_data)
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174 self.internal_data[timestamp].append(entities)
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175 # we still need to fill the history and signal the echo...
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176 send(history_data, skip_send=True)
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177 else:
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178 # target server misses the addressing feature
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179 send(history_data)
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180
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181 def errback(failure, to_jid):
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182 discoCallback(None, to_jid)
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183
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184 timestamp = time()
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185 self.internal_data[timestamp] = []
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186 defer_list = []
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187 for type_, jid_ in entries:
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188 d = defer.Deferred()
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189 d.addCallback(
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190 self.host.findFeaturesSet, client=client, jid_=JID(JID(jid_).host)
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191 )
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192 d.addCallbacks(
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193 discoCallback, errback, callbackArgs=[jid_], errbackArgs=[jid_]
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194 )
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195 d.callback([NS_ADDRESS])
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196 defer_list.append(d)
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197 d = defer.Deferred().addCallback(lambda dummy: self.internal_data.pop(timestamp))
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198 defer.DeferredList(defer_list).chainDeferred(d)
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199
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200 def messageReceivedTrigger(self, client, message, post_treat):
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201 """In order to save the addressing information in the history"""
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202
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203 def post_treat_addr(data, addresses):
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204 data["extra"]["addresses"] = ""
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205 for address in addresses:
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206 # Depending how message has been constructed, we could get here
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207 # some noise like "\n " instead of an address element.
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208 if isinstance(address, domish.Element):
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209 data["extra"]["addresses"] += "%s:%s\n" % (
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210 address["type"],
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211 address["jid"],
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212 )
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213 return data
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214
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215 try:
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216 addresses = message.elements(NS_ADDRESS, "addresses").next()
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217 except StopIteration:
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218 pass # no addresses
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219 else:
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220 post_treat.addCallback(post_treat_addr, addresses.children)
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221 return True
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222
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223 def getHandler(self, client):
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224 return XEP_0033_handler(self, client.profile)
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225
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226
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227 class XEP_0033_handler(XMPPHandler):
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228 implements(iwokkel.IDisco)
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229
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230 def __init__(self, plugin_parent, profile):
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231 self.plugin_parent = plugin_parent
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232 self.host = plugin_parent.host
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233 self.profile = profile
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234
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235 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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236 return [disco.DiscoFeature(NS_ADDRESS)]
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237
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238 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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239 return []