Mercurial > libervia-backend

annotate libervia/backend/plugins/plugin_xep_0047.py @ 4351:6a0a081485b8

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plugin autocrypt: Autocrypt protocol implementation: Implementation of autocrypt: `autocrypt` header is checked, and if present and no public key is known for the peer, the key is imported. `autocrypt` header is also added to outgoing message (only if an email gateway is detected). For the moment, the JID is use as identifier, but the real email used by gateway should be used in the future. rel 456
author Goffi <goffi@goffi.org>
date Fri, 28 Feb 2025 09:23:35 +0100
parents 0d7bb4df2343
children
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rev   line source
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1 #!/usr/bin/env python3
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2
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3
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4 # SAT plugin for managing gateways (xep-0047)
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5 # Copyright (C) 2009-2021 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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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 libervia.backend.core.i18n import _
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21 from libervia.backend.core.log import getLogger
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22
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23 log = getLogger(__name__)
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24 from libervia.backend.core.constants import Const as C
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25 from libervia.backend.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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33 from wokkel import disco, iwokkel
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34
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35 from zope.interface import implementer
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37 import base64
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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 get_handler(self, client):
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75 return XEP_0047_handler(self)
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76
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77 def profile_connected(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 _time_out(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(
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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._kill_session(sid, client, "TIMEOUT")
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92
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93 def _kill_session(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:
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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 create_session(self, *args, **kwargs):
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128 """like [_create_session] 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._create_session(*args, **kwargs)[DEFER_KEY]
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133
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134 def _create_session(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 [start_stream]
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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:
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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._time_out, 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 _on_ibb_open(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 """
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162 log.debug(_("IBB stream opening"))
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163 iq_elt.handled = True
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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:
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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._on_ibb_data
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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(
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196 event_close, self._on_ibb_close, client=client
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197 )
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198 # finally, we send the accept stanza
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199 iq_result_elt = xmlstream.toResponse(iq_elt, "result")
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200 client.send(iq_result_elt)
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201
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202 def _on_ibb_close(self, iq_elt, client):
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203 """ "Called when an IBB <close> element is received
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204
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205 @param iq_elt(domish.Element): the whole <iq> stanza
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206 """
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207 iq_elt.handled = True
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208 log.debug(_("IBB stream closing"))
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209 close_elt = next(iq_elt.elements(NS_IBB, "close"))
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210 # XXX: this observer is only triggered on valid sid, so we don't need to check it
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211 sid = close_elt["sid"]
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212
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213 iq_result_elt = xmlstream.toResponse(iq_elt, "result")
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214 client.send(iq_result_elt)
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215 self._kill_session(sid, client)
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216
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217 def _on_ibb_data(self, element, client):
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218 """Observer called on <iq> or <message> stanzas with data element
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219
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220 Manage the data elelement (check validity and write to the stream_object)
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221 @param element(domish.Element): <iq> or <message> stanza
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222 """
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223 element.handled = True
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224 data_elt = next(element.elements(NS_IBB, "data"))
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225 sid = data_elt["sid"]
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226
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227 try:
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228 session_data = client.xep_0047_current_stream[sid]
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diff changeset
229 except KeyError:
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230 log.warning(_("Received data for an unknown session id"))
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231 return self._sendError("item-not-found", None, element, client)
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232
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233 from_jid = session_data["to"]
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234 stream_object = session_data["stream_object"]
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235
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236 if from_jid.full() != element["from"]:
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237 log.warning(
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238 _(
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239 "sended jid inconsistency (man in the middle attack attempt ?)\ninitial={initial}\ngiven={given}"
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240 ).format(initial=from_jid, given=element["from"])
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241 )
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242 if element.name == "iq":
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243 self._sendError("not-acceptable", sid, element, client)
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parents: 1409
diff changeset
244 return
384
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parents:
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245
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246 session_data["seq"] = (session_data["seq"] + 1) % 65535
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Goffi <goffi@goffi.org>
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247 if int(data_elt.getAttribute("seq", -1)) != session_data["seq"]:
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248 log.warning(_("Sequence error"))
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Goffi <goffi@goffi.org>
parents: 2562
diff changeset
249 if element.name == "iq":
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Goffi <goffi@goffi.org>
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250 reason = "not-acceptable"
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Goffi <goffi@goffi.org>
parents: 1409
diff changeset
251 self._sendError(reason, sid, element, client)
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diff changeset
252 self.terminate_stream(session_data, client, reason)
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Goffi <goffi@goffi.org>
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diff changeset
253 return
384
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Goffi <goffi@goffi.org>
parents:
diff changeset
254
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Goffi <goffi@goffi.org>
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diff changeset
255 # we reset the timeout:
7b0fcefd52d4 plugin XEP-0047, XEP-0096: In-Band Bystream plugin cleaning:
Goffi <goffi@goffi.org>
parents: 1409
diff changeset
256 session_data["timer"].reset(TIMEOUT)
384
785420cd63f7 plugins: In-Band Bytestreams (XEP-0047) implementation
Goffi <goffi@goffi.org>
parents:
diff changeset
257
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diff changeset
258 # we can now decode the data
384
785420cd63f7 plugins: In-Band Bytestreams (XEP-0047) implementation
Goffi <goffi@goffi.org>
parents:
diff changeset
259 try:
2489
e2a7bb875957 plugin pipe/stream, file transfert: refactoring and improvments:
Goffi <goffi@goffi.org>
parents: 2483
diff changeset
260 stream_object.write(base64.b64decode(str(data_elt)))
384
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Goffi <goffi@goffi.org>
parents:
diff changeset
261 except TypeError:
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diff changeset
262 # The base64 data is invalid
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diff changeset
263 log.warning(_("Invalid base64 data"))
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Goffi <goffi@goffi.org>
parents: 2562
diff changeset
264 if element.name == "iq":
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diff changeset
265 self._sendError("not-acceptable", sid, element, client)
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Goffi <goffi@goffi.org>
parents: 3479
diff changeset
266 self.terminate_stream(session_data, client, reason)
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Goffi <goffi@goffi.org>
parents: 1409
diff changeset
267 return
384
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Goffi <goffi@goffi.org>
parents:
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268
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diff changeset
269 # we can now ack success
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270 if element.name == "iq":
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diff changeset
271 iq_result_elt = xmlstream.toResponse(element, "result")
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Goffi <goffi@goffi.org>
parents: 1934
diff changeset
272 client.send(iq_result_elt)
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273
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274 def _sendError(self, error_condition, sid, iq_elt, client):
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275 """Send error stanza
384
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276
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277 @param error_condition: one of twisted.words.protocols.jabber.error.STANZA_CONDITIONS keys
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278 @param sid(unicode,None): jingle session id, or None, if session must not be destroyed
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279 @param iq_elt(domish.Element): full <iq> stanza
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280 @param client: %(doc_client)s
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281 """
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Goffi <goffi@goffi.org>
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diff changeset
282 iq_elt = error.StanzaError(error_condition).toResponse(iq_elt)
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diff changeset
283 log.warning(
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diff changeset
284 "Error while managing in-band bytestream session, cancelling: {}".format(
2624
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Goffi <goffi@goffi.org>
parents: 2562
diff changeset
285 error_condition
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Goffi <goffi@goffi.org>
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diff changeset
286 )
56f94936df1e code style reformatting using black
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parents: 2562
diff changeset
287 )
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Goffi <goffi@goffi.org>
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diff changeset
288 if sid is not None:
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diff changeset
289 self._kill_session(sid, client, error_condition)
2129
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Goffi <goffi@goffi.org>
parents: 1934
diff changeset
290 client.send(iq_elt)
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diff changeset
291
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diff changeset
292 def start_stream(
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diff changeset
293 self, client, stream_object, local_jid, to_jid, sid, block_size=None
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diff changeset
294 ):
384
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295 """Launch the stream workflow
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296
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297 @param stream_object(ifaces.IStreamProducer): stream object to send
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298 @param local_jid(jid.JID): jid to use as local jid
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diff changeset
299 This is needed for client which can be addressed with a different jid than
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parents: 2771
diff changeset
300 client.jid if a local part is used (e.g. piotr@file.example.net where
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Goffi <goffi@goffi.org>
parents: 2771
diff changeset
301 client.jid would be file.example.net)
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diff changeset
302 @param to_jid(jid.JID): JID of the recipient
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diff changeset
303 @param sid(unicode): Stream session id
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parents: 1409
diff changeset
304 @param block_size(int, None): size of the block (or None for default)
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parents: 1409
diff changeset
305 """
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diff changeset
306 session_data = self._create_session(client, stream_object, local_jid, to_jid, sid)
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diff changeset
307
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parents: 1409
diff changeset
308 if block_size is None:
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parents: 1409
diff changeset
309 block_size = XEP_0047.BLOCK_SIZE
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parents: 1409
diff changeset
310 assert block_size <= 65535
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parents: 1409
diff changeset
311 session_data["block_size"] = block_size
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Goffi <goffi@goffi.org>
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diff changeset
312
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Goffi <goffi@goffi.org>
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diff changeset
313 iq_elt = client.IQ()
2927
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Goffi <goffi@goffi.org>
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diff changeset
314 iq_elt["from"] = local_jid.full()
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diff changeset
315 iq_elt["to"] = to_jid.full()
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Goffi <goffi@goffi.org>
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diff changeset
316 open_elt = iq_elt.addElement((NS_IBB, "open"))
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Goffi <goffi@goffi.org>
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diff changeset
317 open_elt["block-size"] = str(block_size)
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Goffi <goffi@goffi.org>
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diff changeset
318 open_elt["sid"] = sid
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Goffi <goffi@goffi.org>
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diff changeset
319 open_elt["stanza"] = "iq" # TODO: manage <message> stanza ?
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Goffi <goffi@goffi.org>
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diff changeset
320 args = [session_data, client]
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diff changeset
321 d = iq_elt.send()
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parents: 3479
diff changeset
322 d.addCallbacks(self._iq_data_stream_cb, self._iq_data_stream_eb, args, None, args)
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Goffi <goffi@goffi.org>
parents: 1524
diff changeset
323 return session_data[DEFER_KEY]
384
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parents:
diff changeset
324
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diff changeset
325 def _iq_data_stream_cb(self, iq_elt, session_data, client):
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326 """Called during the whole data streaming
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diff changeset
327
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diff changeset
328 @param iq_elt(domish.Element): iq result
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diff changeset
329 @param session_data(dict): data of this streaming session
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diff changeset
330 @param client: %(doc_client)s
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diff changeset
331 """
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Goffi <goffi@goffi.org>
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diff changeset
332 session_data["timer"].reset(TIMEOUT)
587
952322b1d490 Remove trailing whitespaces.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 585
diff changeset
333
3392
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Goffi <goffi@goffi.org>
parents: 3137
diff changeset
334 # FIXME: producer/consumer mechanism is not used properly here
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Goffi <goffi@goffi.org>
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diff changeset
335 buffer_ = session_data["stream_object"].file_obj.read(session_data["block_size"])
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Goffi <goffi@goffi.org>
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diff changeset
336 if buffer_:
1578
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Goffi <goffi@goffi.org>
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diff changeset
337 next_iq_elt = client.IQ()
2927
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diff changeset
338 next_iq_elt["from"] = session_data["local_jid"].full()
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diff changeset
339 next_iq_elt["to"] = session_data["to"].full()
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Goffi <goffi@goffi.org>
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diff changeset
340 data_elt = next_iq_elt.addElement((NS_IBB, "data"))
56f94936df1e code style reformatting using black
Goffi <goffi@goffi.org>
parents: 2562
diff changeset
341 seq = session_data["seq"] = (session_data["seq"] + 1) % 65535
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Goffi <goffi@goffi.org>
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diff changeset
342 data_elt["seq"] = str(seq)
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diff changeset
343 data_elt["sid"] = session_data["id"]
3392
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Goffi <goffi@goffi.org>
parents: 3137
diff changeset
344 data_elt.addContent(base64.b64encode(buffer_).decode())
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Goffi <goffi@goffi.org>
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diff changeset
345 args = [session_data, client]
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Goffi <goffi@goffi.org>
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diff changeset
346 d = next_iq_elt.send()
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Goffi <goffi@goffi.org>
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diff changeset
347 d.addCallbacks(
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Goffi <goffi@goffi.org>
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diff changeset
348 self._iq_data_stream_cb, self._iq_data_stream_eb, args, None, args
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Goffi <goffi@goffi.org>
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diff changeset
349 )
384
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parents:
diff changeset
350 else:
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diff changeset
351 self.terminate_stream(session_data, client)
384
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Goffi <goffi@goffi.org>
parents:
diff changeset
352
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Goffi <goffi@goffi.org>
parents: 3479
diff changeset
353 def _iq_data_stream_eb(self, failure, session_data, client):
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Goffi <goffi@goffi.org>
parents: 1558
diff changeset
354 if failure.check(error.StanzaError):
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Goffi <goffi@goffi.org>
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diff changeset
355 log.warning("IBB transfer failed: {}".format(failure.value))
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Goffi <goffi@goffi.org>
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diff changeset
356 else:
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Goffi <goffi@goffi.org>
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diff changeset
357 log.error("IBB transfer failed: {}".format(failure.value))
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parents: 3479
diff changeset
358 self.terminate_stream(session_data, client, "IQ_ERROR")
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Goffi <goffi@goffi.org>
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diff changeset
359
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Goffi <goffi@goffi.org>
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diff changeset
360 def terminate_stream(self, session_data, client, failure_reason=None):
384
785420cd63f7 plugins: In-Band Bytestreams (XEP-0047) implementation
Goffi <goffi@goffi.org>
parents:
diff changeset
361 """Terminate the stream session
1524
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diff changeset
362
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diff changeset
363 @param session_data(dict): data of this streaming session
7b0fcefd52d4 plugin XEP-0047, XEP-0096: In-Band Bystream plugin cleaning:
Goffi <goffi@goffi.org>
parents: 1409
diff changeset
364 @param client: %(doc_client)s
7b0fcefd52d4 plugin XEP-0047, XEP-0096: In-Band Bystream plugin cleaning:
Goffi <goffi@goffi.org>
parents: 1409
diff changeset
365 @param failure_reason(unicode, None): reason of the failure, or None if steam was successful
7b0fcefd52d4 plugin XEP-0047, XEP-0096: In-Band Bystream plugin cleaning:
Goffi <goffi@goffi.org>
parents: 1409
diff changeset
366 """
1578
7fef6cdf5953 plugin XEP-0047: some cleaning
Goffi <goffi@goffi.org>
parents: 1558
diff changeset
367 iq_elt = client.IQ()
2927
69e4716d6268 plugins (jingle) file transfer: use initial "from" attribute as local jid instead of client.jid:
Goffi <goffi@goffi.org>
parents: 2771
diff changeset
368 iq_elt["from"] = session_data["local_jid"].full()
2624
56f94936df1e code style reformatting using black
Goffi <goffi@goffi.org>
parents: 2562
diff changeset
369 iq_elt["to"] = session_data["to"].full()
56f94936df1e code style reformatting using black
Goffi <goffi@goffi.org>
parents: 2562
diff changeset
370 close_elt = iq_elt.addElement((NS_IBB, "close"))
56f94936df1e code style reformatting using black
Goffi <goffi@goffi.org>
parents: 2562
diff changeset
371 close_elt["sid"] = session_data["id"]
384
785420cd63f7 plugins: In-Band Bytestreams (XEP-0047) implementation
Goffi <goffi@goffi.org>
parents:
diff changeset
372 iq_elt.send()
4037
524856bd7b19 massive refactoring to switch from camelCase to snake_case:
Goffi <goffi@goffi.org>
parents: 3479
diff changeset
373 self._kill_session(session_data["id"], client, failure_reason)
384
785420cd63f7 plugins: In-Band Bytestreams (XEP-0047) implementation
Goffi <goffi@goffi.org>
parents:
diff changeset
374
594
e629371a28d3 Fix pep8 support in src/plugins.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 588
diff changeset
375
3028
ab2696e34d29 Python 3 port:
Goffi <goffi@goffi.org>
parents: 2927
diff changeset
376 @implementer(iwokkel.IDisco)
384
785420cd63f7 plugins: In-Band Bytestreams (XEP-0047) implementation
Goffi <goffi@goffi.org>
parents:
diff changeset
377 class XEP_0047_handler(XMPPHandler):
587
952322b1d490 Remove trailing whitespaces.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 585
diff changeset
378
594
e629371a28d3 Fix pep8 support in src/plugins.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 588
diff changeset
379 def __init__(self, parent):
384
785420cd63f7 plugins: In-Band Bytestreams (XEP-0047) implementation
Goffi <goffi@goffi.org>
parents:
diff changeset
380 self.plugin_parent = parent
587
952322b1d490 Remove trailing whitespaces.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 585
diff changeset
381
384
785420cd63f7 plugins: In-Band Bytestreams (XEP-0047) implementation
Goffi <goffi@goffi.org>
parents:
diff changeset
382 def connectionInitialized(self):
2624
56f94936df1e code style reformatting using black
Goffi <goffi@goffi.org>
parents: 2562
diff changeset
383 self.xmlstream.addObserver(
4037
524856bd7b19 massive refactoring to switch from camelCase to snake_case:
Goffi <goffi@goffi.org>
parents: 3479
diff changeset
384 IBB_OPEN, self.plugin_parent._on_ibb_open, client=self.parent
2624
56f94936df1e code style reformatting using black
Goffi <goffi@goffi.org>
parents: 2562
diff changeset
385 )
384
785420cd63f7 plugins: In-Band Bytestreams (XEP-0047) implementation
Goffi <goffi@goffi.org>
parents:
diff changeset
386
2624
56f94936df1e code style reformatting using black
Goffi <goffi@goffi.org>
parents: 2562
diff changeset
387 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
384
785420cd63f7 plugins: In-Band Bytestreams (XEP-0047) implementation
Goffi <goffi@goffi.org>
parents:
diff changeset
388 return [disco.DiscoFeature(NS_IBB)]
785420cd63f7 plugins: In-Band Bytestreams (XEP-0047) implementation
Goffi <goffi@goffi.org>
parents:
diff changeset
389
2624
56f94936df1e code style reformatting using black
Goffi <goffi@goffi.org>
parents: 2562
diff changeset
390 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
384
785420cd63f7 plugins: In-Band Bytestreams (XEP-0047) implementation
Goffi <goffi@goffi.org>
parents:
diff changeset
391 return []