Mercurial > libervia-backend
annotate sat/plugins/plugin_xep_0047.py @ 3070:1370323e8f6c
quick frontend (chat): removed hack not needed anymore now that Pyjamas is not used anymore
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Fri, 08 Nov 2019 11:56:21 +0100 |
| parents | ab2696e34d29 |
| children | 9d0df638c8b4 |
| rev | line source |
|---|---|
| 3028 | 1 #!/usr/bin/env python3 |
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2 # -*- coding: utf-8 -*- |
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3 |
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4 # SAT plugin for managing gateways (xep-0047) |
| 2771 | 5 # Copyright (C) 2009-2019 Jérôme Poisson (goffi@goffi.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 |
| 771 | 20 from sat.core.i18n import _ |
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21 from sat.core.log import getLogger |
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22 |
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23 log = getLogger(__name__) |
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24 from sat.core.constants import Const as C |
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25 from sat.core import exceptions |
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26 from twisted.words.protocols.jabber import jid |
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27 from twisted.words.protocols.jabber import xmlstream |
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28 from twisted.words.protocols.jabber import error |
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29 from twisted.internet import reactor |
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30 from twisted.internet import defer |
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31 from twisted.python import failure |
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32 |
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33 from wokkel import disco, iwokkel |
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34 |
| 3028 | 35 from zope.interface import implementer |
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36 |
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37 import base64 |
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38 |
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39 try: |
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40 from twisted.words.protocols.xmlstream import XMPPHandler |
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41 except ImportError: |
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42 from wokkel.subprotocols import XMPPHandler |
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43 |
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44 MESSAGE = "/message" |
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45 IQ_SET = '/iq[@type="set"]' |
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46 NS_IBB = "http://jabber.org/protocol/ibb" |
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47 IBB_OPEN = IQ_SET + '/open[@xmlns="' + NS_IBB + '"]' |
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48 IBB_CLOSE = IQ_SET + '/close[@xmlns="' + NS_IBB + '" and @sid="{}"]' |
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49 IBB_IQ_DATA = IQ_SET + '/data[@xmlns="' + NS_IBB + '" and @sid="{}"]' |
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50 IBB_MESSAGE_DATA = MESSAGE + '/data[@xmlns="' + NS_IBB + '" and @sid="{}"]' |
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51 TIMEOUT = 120 # timeout for workflow |
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52 DEFER_KEY = "finished" # key of the deferred used to track session end |
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53 |
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54 PLUGIN_INFO = { |
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55 C.PI_NAME: "In-Band Bytestream Plugin", |
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56 C.PI_IMPORT_NAME: "XEP-0047", |
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57 C.PI_TYPE: "XEP", |
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58 C.PI_MODES: C.PLUG_MODE_BOTH, |
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59 C.PI_PROTOCOLS: ["XEP-0047"], |
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60 C.PI_MAIN: "XEP_0047", |
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61 C.PI_HANDLER: "yes", |
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62 C.PI_DESCRIPTION: _("""Implementation of In-Band Bytestreams"""), |
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63 } |
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64 |
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65 |
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66 class XEP_0047(object): |
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67 NAMESPACE = NS_IBB |
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68 BLOCK_SIZE = 4096 |
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69 |
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70 def __init__(self, host): |
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71 log.info(_("In-Band Bytestreams plugin initialization")) |
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72 self.host = host |
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73 |
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74 def getHandler(self, client): |
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75 return XEP_0047_handler(self) |
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76 |
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77 def profileConnected(self, client): |
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78 client.xep_0047_current_stream = {} # key: stream_id, value: data(dict) |
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79 |
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80 def _timeOut(self, sid, client): |
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81 """Delete current_stream id, called after timeout |
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82 |
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83 @param sid(unicode): session id of client.xep_0047_current_stream |
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84 @param client: %(doc_client)s |
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85 """ |
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86 log.info( |
| 3028 | 87 "In-Band Bytestream: TimeOut reached for id {sid} [{profile}]".format( |
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88 sid=sid, profile=client.profile |
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89 ) |
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90 ) |
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91 self._killSession(sid, client, "TIMEOUT") |
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92 |
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93 def _killSession(self, sid, client, failure_reason=None): |
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94 """Delete a current_stream id, clean up associated observers |
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95 |
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96 @param sid(unicode): session id |
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97 @param client: %(doc_client)s |
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98 @param failure_reason(None, unicode): if None the session is successful |
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99 else, will be used to call failure_cb |
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100 """ |
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101 try: |
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102 session = client.xep_0047_current_stream[sid] |
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103 except KeyError: |
| 3028 | 104 log.warning("kill id called on a non existant id") |
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105 return |
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106 |
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107 try: |
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108 observer_cb = session["observer_cb"] |
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109 except KeyError: |
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110 pass |
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111 else: |
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112 client.xmlstream.removeObserver(session["event_data"], observer_cb) |
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113 |
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114 if session["timer"].active(): |
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115 session["timer"].cancel() |
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116 |
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117 del client.xep_0047_current_stream[sid] |
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118 |
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119 success = failure_reason is None |
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120 stream_d = session[DEFER_KEY] |
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121 |
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122 if success: |
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123 stream_d.callback(None) |
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124 else: |
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125 stream_d.errback(failure.Failure(exceptions.DataError(failure_reason))) |
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126 |
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127 def createSession(self, *args, **kwargs): |
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128 """like [_createSession] but return the session deferred instead of the whole session |
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129 |
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130 session deferred is fired when transfer is finished |
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131 """ |
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132 return self._createSession(*args, **kwargs)[DEFER_KEY] |
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133 |
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134 def _createSession(self, client, stream_object, local_jid, to_jid, sid): |
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135 """Called when a bytestream is imminent |
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136 |
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137 @param stream_object(IConsumer): stream object where data will be written |
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138 @param local_jid(jid.JID): same as [startStream] |
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139 @param to_jid(jid.JId): jid of the other peer |
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140 @param sid(unicode): session id |
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141 @return (dict): session data |
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142 """ |
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143 if sid in client.xep_0047_current_stream: |
| 3028 | 144 raise exceptions.ConflictError("A session with this id already exists !") |
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145 session_data = client.xep_0047_current_stream[sid] = { |
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146 "id": sid, |
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147 DEFER_KEY: defer.Deferred(), |
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148 "local_jid": local_jid, |
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149 "to": to_jid, |
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150 "stream_object": stream_object, |
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151 "seq": -1, |
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152 "timer": reactor.callLater(TIMEOUT, self._timeOut, sid, client), |
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153 } |
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154 |
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155 return session_data |
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156 |
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157 def _onIBBOpen(self, iq_elt, client): |
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158 """"Called when an IBB <open> element is received |
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159 |
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160 @param iq_elt(domish.Element): the whole <iq> stanza |
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161 """ |
| 3028 | 162 log.debug(_("IBB stream opening")) |
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163 iq_elt.handled = True |
| 3028 | 164 open_elt = next(iq_elt.elements(NS_IBB, "open")) |
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165 block_size = open_elt.getAttribute("block-size") |
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166 sid = open_elt.getAttribute("sid") |
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167 stanza = open_elt.getAttribute("stanza", "iq") |
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168 if not sid or not block_size or int(block_size) > 65535: |
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169 return self._sendError("not-acceptable", sid or None, iq_elt, client) |
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170 if not sid in client.xep_0047_current_stream: |
| 3028 | 171 log.warning(_("Ignoring unexpected IBB transfer: %s" % sid)) |
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172 return self._sendError("not-acceptable", sid or None, iq_elt, client) |
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173 session_data = client.xep_0047_current_stream[sid] |
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174 if session_data["to"] != jid.JID(iq_elt["from"]): |
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175 log.warning( |
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176 _("sended jid inconsistency (man in the middle attack attempt ?)") |
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177 ) |
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178 return self._sendError("not-acceptable", sid, iq_elt, client) |
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179 |
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180 # at this stage, the session looks ok and will be accepted |
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181 |
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182 # we reset the timeout: |
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183 session_data["timer"].reset(TIMEOUT) |
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184 |
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185 # we save the xmlstream, events and observer data to allow observer removal |
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186 session_data["event_data"] = event_data = ( |
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187 IBB_MESSAGE_DATA if stanza == "message" else IBB_IQ_DATA |
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188 ).format(sid) |
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189 session_data["observer_cb"] = observer_cb = self._onIBBData |
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190 event_close = IBB_CLOSE.format(sid) |
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191 # we now set the stream observer to look after data packet |
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192 # FIXME: if we never get the events, the observers stay. |
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193 # would be better to have generic observer and check id once triggered |
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194 client.xmlstream.addObserver(event_data, observer_cb, client=client) |
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195 client.xmlstream.addOnetimeObserver(event_close, self._onIBBClose, client=client) |
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196 # finally, we send the accept stanza |
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197 iq_result_elt = xmlstream.toResponse(iq_elt, "result") |
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198 client.send(iq_result_elt) |
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199 |
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200 def _onIBBClose(self, iq_elt, client): |
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201 """"Called when an IBB <close> element is received |
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202 |
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203 @param iq_elt(domish.Element): the whole <iq> stanza |
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204 """ |
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205 iq_elt.handled = True |
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206 log.debug(_("IBB stream closing")) |
| 3028 | 207 close_elt = next(iq_elt.elements(NS_IBB, "close")) |
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208 # XXX: this observer is only triggered on valid sid, so we don't need to check it |
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209 sid = close_elt["sid"] |
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210 |
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211 iq_result_elt = xmlstream.toResponse(iq_elt, "result") |
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212 client.send(iq_result_elt) |
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213 self._killSession(sid, client) |
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214 |
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215 def _onIBBData(self, element, client): |
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216 """Observer called on <iq> or <message> stanzas with data element |
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217 |
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218 Manage the data elelement (check validity and write to the stream_object) |
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219 @param element(domish.Element): <iq> or <message> stanza |
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220 """ |
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221 element.handled = True |
| 3028 | 222 data_elt = next(element.elements(NS_IBB, "data")) |
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223 sid = data_elt["sid"] |
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224 |
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225 try: |
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226 session_data = client.xep_0047_current_stream[sid] |
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227 except KeyError: |
| 3028 | 228 log.warning(_("Received data for an unknown session id")) |
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229 return self._sendError("item-not-found", None, element, client) |
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230 |
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231 from_jid = session_data["to"] |
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232 stream_object = session_data["stream_object"] |
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233 |
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234 if from_jid.full() != element["from"]: |
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235 log.warning( |
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236 _( |
| 3028 | 237 "sended jid inconsistency (man in the middle attack attempt ?)\ninitial={initial}\ngiven={given}" |
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238 ).format(initial=from_jid, given=element["from"]) |
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239 ) |
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240 if element.name == "iq": |
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241 self._sendError("not-acceptable", sid, element, client) |
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242 return |
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243 |
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244 session_data["seq"] = (session_data["seq"] + 1) % 65535 |
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245 if int(data_elt.getAttribute("seq", -1)) != session_data["seq"]: |
| 3028 | 246 log.warning(_("Sequence error")) |
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247 if element.name == "iq": |
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248 reason = "not-acceptable" |
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249 self._sendError(reason, sid, element, client) |
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250 self.terminateStream(session_data, client, reason) |
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251 return |
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252 |
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253 # we reset the timeout: |
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254 session_data["timer"].reset(TIMEOUT) |
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255 |
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256 # we can now decode the data |
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257 try: |
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258 stream_object.write(base64.b64decode(str(data_elt))) |
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259 except TypeError: |
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260 # The base64 data is invalid |
| 3028 | 261 log.warning(_("Invalid base64 data")) |
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262 if element.name == "iq": |
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263 self._sendError("not-acceptable", sid, element, client) |
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264 self.terminateStream(session_data, client, reason) |
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265 return |
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266 |
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267 # we can now ack success |
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268 if element.name == "iq": |
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269 iq_result_elt = xmlstream.toResponse(element, "result") |
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270 client.send(iq_result_elt) |
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271 |
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272 def _sendError(self, error_condition, sid, iq_elt, client): |
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273 """Send error stanza |
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274 |
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275 @param error_condition: one of twisted.words.protocols.jabber.error.STANZA_CONDITIONS keys |
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276 @param sid(unicode,None): jingle session id, or None, if session must not be destroyed |
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277 @param iq_elt(domish.Element): full <iq> stanza |
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278 @param client: %(doc_client)s |
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279 """ |
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280 iq_elt = error.StanzaError(error_condition).toResponse(iq_elt) |
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281 log.warning( |
| 3028 | 282 "Error while managing in-band bytestream session, cancelling: {}".format( |
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283 error_condition |
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284 ) |
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285 ) |
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286 if sid is not None: |
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287 self._killSession(sid, client, error_condition) |
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288 client.send(iq_elt) |
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289 |
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290 def startStream(self, client, stream_object, local_jid, to_jid, sid, block_size=None): |
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291 """Launch the stream workflow |
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292 |
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293 @param stream_object(ifaces.IStreamProducer): stream object to send |
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294 @param local_jid(jid.JID): jid to use as local jid |
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295 This is needed for client which can be addressed with a different jid than |
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296 client.jid if a local part is used (e.g. piotr@file.example.net where |
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297 client.jid would be file.example.net) |
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298 @param to_jid(jid.JID): JID of the recipient |
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299 @param sid(unicode): Stream session id |
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300 @param block_size(int, None): size of the block (or None for default) |
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301 """ |
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302 session_data = self._createSession(client, stream_object, local_jid, to_jid, sid) |
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303 |
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304 if block_size is None: |
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305 block_size = XEP_0047.BLOCK_SIZE |
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306 assert block_size <= 65535 |
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307 session_data["block_size"] = block_size |
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308 |
| 1578 | 309 iq_elt = client.IQ() |
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310 iq_elt["from"] = local_jid.full() |
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311 iq_elt["to"] = to_jid.full() |
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312 open_elt = iq_elt.addElement((NS_IBB, "open")) |
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313 open_elt["block-size"] = str(block_size) |
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314 open_elt["sid"] = sid |
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315 open_elt["stanza"] = "iq" # TODO: manage <message> stanza ? |
| 1578 | 316 args = [session_data, client] |
| 317 d = iq_elt.send() | |
| 318 d.addCallbacks(self._IQDataStreamCb, self._IQDataStreamEb, args, None, args) | |
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319 return session_data[DEFER_KEY] |
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320 |
| 1578 | 321 def _IQDataStreamCb(self, iq_elt, session_data, client): |
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322 """Called during the whole data streaming |
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323 |
| 1578 | 324 @param iq_elt(domish.Element): iq result |
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325 @param session_data(dict): data of this streaming session |
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326 @param client: %(doc_client)s |
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327 """ |
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328 session_data["timer"].reset(TIMEOUT) |
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329 |
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330 buffer_ = session_data["stream_object"].read(session_data["block_size"]) |
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331 if buffer_: |
| 1578 | 332 next_iq_elt = client.IQ() |
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333 next_iq_elt["from"] = session_data["local_jid"].full() |
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334 next_iq_elt["to"] = session_data["to"].full() |
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335 data_elt = next_iq_elt.addElement((NS_IBB, "data")) |
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336 seq = session_data["seq"] = (session_data["seq"] + 1) % 65535 |
| 3028 | 337 data_elt["seq"] = str(seq) |
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338 data_elt["sid"] = session_data["id"] |
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339 data_elt.addContent(base64.b64encode(buffer_)) |
| 1578 | 340 args = [session_data, client] |
| 341 d = next_iq_elt.send() | |
| 342 d.addCallbacks(self._IQDataStreamCb, self._IQDataStreamEb, args, None, args) | |
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343 else: |
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344 self.terminateStream(session_data, client) |
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345 |
| 1578 | 346 def _IQDataStreamEb(self, failure, session_data, client): |
| 347 if failure.check(error.StanzaError): | |
| 3028 | 348 log.warning("IBB transfer failed: {}".format(failure.value)) |
| 1578 | 349 else: |
| 3028 | 350 log.error("IBB transfer failed: {}".format(failure.value)) |
| 1578 | 351 self.terminateStream(session_data, client, "IQ_ERROR") |
| 352 | |
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353 def terminateStream(self, session_data, client, failure_reason=None): |
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354 """Terminate the stream session |
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355 |
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356 @param session_data(dict): data of this streaming session |
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357 @param client: %(doc_client)s |
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358 @param failure_reason(unicode, None): reason of the failure, or None if steam was successful |
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359 """ |
| 1578 | 360 iq_elt = client.IQ() |
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361 iq_elt["from"] = session_data["local_jid"].full() |
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362 iq_elt["to"] = session_data["to"].full() |
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363 close_elt = iq_elt.addElement((NS_IBB, "close")) |
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364 close_elt["sid"] = session_data["id"] |
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365 iq_elt.send() |
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366 self._killSession(session_data["id"], client, failure_reason) |
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367 |
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368 |
| 3028 | 369 @implementer(iwokkel.IDisco) |
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370 class XEP_0047_handler(XMPPHandler): |
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371 |
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372 def __init__(self, parent): |
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373 self.plugin_parent = parent |
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374 |
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375 def connectionInitialized(self): |
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376 self.xmlstream.addObserver( |
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377 IBB_OPEN, self.plugin_parent._onIBBOpen, client=self.parent |
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378 ) |
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379 |
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380 def getDiscoInfo(self, requestor, target, nodeIdentifier=""): |
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381 return [disco.DiscoFeature(NS_IBB)] |
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382 |
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383 def getDiscoItems(self, requestor, target, nodeIdentifier=""): |
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384 return [] |