Mercurial > libervia-backend
annotate sat/plugins/plugin_xep_0166.py @ 3483:5945c24cd745
install: added `requirements.txt`
author | Goffi <goffi@goffi.org> |
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date | Sat, 20 Mar 2021 20:42:07 +0100 |
parents | be6d91572633 |
children | bbf92ef05f38 |
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3028 | 1 #!/usr/bin/env python3 |
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3 # SàT plugin for Jingle (XEP-0166) |
3479 | 4 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org) |
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5 |
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6 # This program is free software: you can redistribute it and/or modify |
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7 # it under the terms of the GNU Affero General Public License as published by |
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8 # the Free Software Foundation, either version 3 of the License, or |
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9 # (at your option) any later version. |
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10 |
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11 # This program is distributed in the hope that it will be useful, |
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 # GNU Affero General Public License for more details. |
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15 |
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16 # You should have received a copy of the GNU Affero General Public License |
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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18 |
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19 |
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20 import uuid |
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21 import time |
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22 from typing import Tuple |
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23 from collections import namedtuple |
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24 from zope.interface import implementer |
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25 from twisted.words.protocols.jabber import jid |
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26 from twisted.internet import defer |
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27 from twisted.internet import reactor |
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28 from twisted.words.protocols.jabber import error |
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29 from twisted.words.protocols.jabber import xmlstream |
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30 from twisted.python import failure |
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31 from wokkel import disco, iwokkel |
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32 from sat.core import exceptions |
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33 from sat.core.i18n import _, D_ |
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34 from sat.core.constants import Const as C |
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35 from sat.core.log import getLogger |
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36 from sat.tools import xml_tools |
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37 from sat.tools import utils |
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38 |
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39 |
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40 log = getLogger(__name__) |
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41 |
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42 |
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43 IQ_SET = '/iq[@type="set"]' |
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44 NS_JINGLE = "urn:xmpp:jingle:1" |
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45 NS_JINGLE_ERROR = "urn:xmpp:jingle:errors:1" |
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46 JINGLE_REQUEST = IQ_SET + '/jingle[@xmlns="' + NS_JINGLE + '"]' |
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47 STATE_PENDING = "PENDING" |
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48 STATE_ACTIVE = "ACTIVE" |
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49 STATE_ENDED = "ENDED" |
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50 CONFIRM_TXT = D_("{entity} want to start a jingle session with you, do you accept ?") |
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51 |
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52 PLUGIN_INFO = { |
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53 C.PI_NAME: "Jingle", |
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54 C.PI_IMPORT_NAME: "XEP-0166", |
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55 C.PI_TYPE: "XEP", |
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56 C.PI_MODES: C.PLUG_MODE_BOTH, |
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57 C.PI_PROTOCOLS: ["XEP-0166"], |
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58 C.PI_MAIN: "XEP_0166", |
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59 C.PI_HANDLER: "yes", |
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60 C.PI_DESCRIPTION: _("""Implementation of Jingle"""), |
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61 } |
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62 |
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63 |
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64 ApplicationData = namedtuple("ApplicationData", ("namespace", "handler")) |
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65 TransportData = namedtuple("TransportData", ("namespace", "handler", "priority")) |
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66 |
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67 |
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68 class XEP_0166(object): |
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69 ROLE_INITIATOR = "initiator" |
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70 ROLE_RESPONDER = "responder" |
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71 TRANSPORT_DATAGRAM = "UDP" |
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72 TRANSPORT_STREAMING = "TCP" |
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73 REASON_SUCCESS = "success" |
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74 REASON_DECLINE = "decline" |
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75 REASON_FAILED_APPLICATION = "failed-application" |
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76 REASON_FAILED_TRANSPORT = "failed-transport" |
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77 REASON_CONNECTIVITY_ERROR = "connectivity-error" |
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78 A_SESSION_INITIATE = "session-initiate" |
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79 A_SESSION_ACCEPT = "session-accept" |
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80 A_SESSION_TERMINATE = "session-terminate" |
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81 A_SESSION_INFO = "session-info" |
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82 A_TRANSPORT_REPLACE = "transport-replace" |
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83 A_TRANSPORT_ACCEPT = "transport-accept" |
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84 A_TRANSPORT_REJECT = "transport-reject" |
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85 A_TRANSPORT_INFO = "transport-info" |
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86 # non standard actions |
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87 A_PREPARE_INITIATOR = "prepare-initiator" # initiator must prepare tranfer |
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88 A_PREPARE_RESPONDER = "prepare-responder" # responder must prepare tranfer |
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89 A_ACCEPTED_ACK = ( |
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90 "accepted-ack" |
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91 ) # session accepted ack has been received from initiator |
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92 A_START = "start" # application can start |
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93 A_DESTROY = ( |
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94 "destroy" |
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95 ) # called when a transport is destroyed (e.g. because it is remplaced). Used to do cleaning operations |
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96 |
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97 def __init__(self, host): |
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98 log.info(_("plugin Jingle initialization")) |
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99 self.host = host |
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100 self._applications = {} # key: namespace, value: application data |
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101 self._transports = {} # key: namespace, value: transport data |
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102 # we also keep transports by type, they are then sorted by priority |
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103 self._type_transports = { |
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104 XEP_0166.TRANSPORT_DATAGRAM: [], |
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105 XEP_0166.TRANSPORT_STREAMING: [], |
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106 } |
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107 |
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108 def profileConnected(self, client): |
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109 client.jingle_sessions = {} # key = sid, value = session_data |
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110 |
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111 def getHandler(self, client): |
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112 return XEP_0166_handler(self) |
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113 |
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114 def _delSession(self, client, sid): |
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115 try: |
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116 del client.jingle_sessions[sid] |
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117 except KeyError: |
3040 | 118 log.debug( |
119 f"Jingle session id {sid!r} is unknown, nothing to delete " | |
120 f"[{client.profile}]") | |
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121 else: |
3040 | 122 log.debug(f"Jingle session id {sid!r} deleted [{client.profile}]") |
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123 |
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124 ## helpers methods to build stanzas ## |
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125 |
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126 def _buildJingleElt(self, client, session, action): |
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127 iq_elt = client.IQ("set") |
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128 iq_elt["from"] = session['local_jid'].full() |
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129 iq_elt["to"] = session["peer_jid"].full() |
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130 jingle_elt = iq_elt.addElement("jingle", NS_JINGLE) |
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131 jingle_elt["sid"] = session["id"] |
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132 jingle_elt["action"] = action |
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133 return iq_elt, jingle_elt |
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134 |
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135 def sendError(self, client, error_condition, sid, request, jingle_condition=None): |
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136 """Send error stanza |
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137 |
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138 @param error_condition: one of twisted.words.protocols.jabber.error.STANZA_CONDITIONS keys |
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139 @param sid(unicode,None): jingle session id, or None, if session must not be destroyed |
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140 @param request(domish.Element): original request |
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141 @param jingle_condition(None, unicode): if not None, additional jingle-specific error information |
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142 """ |
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143 iq_elt = error.StanzaError(error_condition).toResponse(request) |
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144 if jingle_condition is not None: |
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145 iq_elt.error.addElement((NS_JINGLE_ERROR, jingle_condition)) |
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146 if error.STANZA_CONDITIONS[error_condition]["type"] == "cancel" and sid: |
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147 self._delSession(client, sid) |
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148 log.warning( |
3028 | 149 "Error while managing jingle session, cancelling: {condition}".format( |
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150 condition=error_condition |
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151 ) |
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152 ) |
3040 | 153 return client.send(iq_elt) |
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154 |
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155 def _terminateEb(self, failure_): |
3028 | 156 log.warning(_("Error while terminating session: {msg}").format(msg=failure_)) |
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157 |
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158 def terminate(self, client, reason, session): |
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159 """Terminate the session |
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160 |
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161 send the session-terminate action, and delete the session data |
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162 @param reason(unicode, list[domish.Element]): if unicode, will be transformed to an element |
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163 if a list of element, add them as children of the <reason/> element |
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164 @param session(dict): data of the session |
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165 """ |
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166 iq_elt, jingle_elt = self._buildJingleElt( |
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167 client, session, XEP_0166.A_SESSION_TERMINATE |
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168 ) |
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169 reason_elt = jingle_elt.addElement("reason") |
3028 | 170 if isinstance(reason, str): |
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171 reason_elt.addElement(reason) |
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172 else: |
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173 for elt in reason: |
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174 reason_elt.addChild(elt) |
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175 self._delSession(client, session["id"]) |
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176 d = iq_elt.send() |
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177 d.addErrback(self._terminateEb) |
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178 return d |
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179 |
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180 ## errors which doesn't imply a stanza sending ## |
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181 |
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182 def _iqError(self, failure_, sid, client): |
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183 """Called when we got an <iq/> error |
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184 |
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185 @param failure_(failure.Failure): the exceptions raised |
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186 @param sid(unicode): jingle session id |
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187 """ |
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188 log.warning( |
3028 | 189 "Error while sending jingle <iq/> stanza: {failure_}".format( |
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190 failure_=failure_.value |
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191 ) |
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192 ) |
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193 self._delSession(client, sid) |
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194 |
3040 | 195 def _jingleErrorCb(self, failure_, session, request, client): |
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196 """Called when something is going wrong while parsing jingle request |
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197 |
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198 The error condition depend of the exceptions raised: |
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199 exceptions.DataError raise a bad-request condition |
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200 @param fail(failure.Failure): the exceptions raised |
3040 | 201 @param session(dict): data of the session |
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202 @param request(domsih.Element): jingle request |
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203 @param client: %(doc_client)s |
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204 """ |
3040 | 205 log.warning(f"Error while processing jingle request [{client.profile}]") |
206 if isinstance(failure_, exceptions.DataError): | |
207 return self.sendError(client, "bad-request", session['id'], request) | |
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208 else: |
3040 | 209 log.error(f"Unmanaged jingle exception: {failure_}") |
210 return self.terminate(client, self.REASON_FAILED_APPLICATION, session) | |
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211 |
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212 ## methods used by other plugins ## |
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213 |
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214 def registerApplication(self, namespace, handler): |
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215 """Register an application plugin |
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216 |
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217 @param namespace(unicode): application namespace managed by the plugin |
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218 @param handler(object): instance of a class which manage the application. |
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219 May have the following methods: |
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220 - requestConfirmation(session, desc_elt, client): |
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221 - if present, it is called on when session must be accepted. |
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222 - if it return True the session is accepted, else rejected. |
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223 A Deferred can be returned |
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224 - if not present, a generic accept dialog will be used |
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225 - jingleSessionInit(client, self, session, content_name[, *args, **kwargs]): must return the domish.Element used for initial content |
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226 - jingleHandler(client, self, action, session, content_name, transport_elt): |
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227 called on several action to negociate the application or transport |
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228 - jingleTerminate: called on session terminate, with reason_elt |
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229 May be used to clean session |
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230 """ |
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231 if namespace in self._applications: |
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232 raise exceptions.ConflictError( |
3028 | 233 "Trying to register already registered namespace {}".format(namespace) |
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234 ) |
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235 self._applications[namespace] = ApplicationData( |
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236 namespace=namespace, handler=handler |
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237 ) |
3028 | 238 log.debug("new jingle application registered") |
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239 |
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240 def registerTransport(self, namespace, transport_type, handler, priority=0): |
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241 """Register a transport plugin |
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242 |
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243 @param namespace(unicode): the XML namespace used for this transport |
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244 @param transport_type(unicode): type of transport to use (see XEP-0166 §8) |
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245 @param handler(object): instance of a class which manage the application. |
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246 Must have the following methods: |
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247 - jingleSessionInit(client, self, session, content_name[, *args, **kwargs]): must return the domish.Element used for initial content |
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248 - jingleHandler(client, self, action, session, content_name, transport_elt): |
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249 called on several action to negociate the application or transport |
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250 @param priority(int): priority of this transport |
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251 """ |
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252 assert transport_type in ( |
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253 XEP_0166.TRANSPORT_DATAGRAM, |
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254 XEP_0166.TRANSPORT_STREAMING, |
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255 ) |
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256 if namespace in self._transports: |
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257 raise exceptions.ConflictError( |
3028 | 258 "Trying to register already registered namespace {}".format(namespace) |
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259 ) |
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260 transport_data = TransportData( |
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261 namespace=namespace, handler=handler, priority=priority |
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262 ) |
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263 self._type_transports[transport_type].append(transport_data) |
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264 self._type_transports[transport_type].sort( |
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265 key=lambda transport_data: transport_data.priority, reverse=True |
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266 ) |
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267 self._transports[namespace] = transport_data |
3028 | 268 log.debug("new jingle transport registered") |
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269 |
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270 @defer.inlineCallbacks |
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271 def transportReplace(self, client, transport_ns, session, content_name): |
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272 """Replace a transport |
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273 |
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274 @param transport_ns(unicode): namespace of the new transport to use |
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275 @param session(dict): jingle session data |
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276 @param content_name(unicode): name of the content |
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277 """ |
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278 # XXX: for now we replace the transport before receiving confirmation from other peer |
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279 # this is acceptable because we terminate the session if transport is rejected. |
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280 # this behavious may change in the future. |
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281 content_data = session["contents"][content_name] |
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282 transport_data = content_data["transport_data"] |
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283 try: |
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284 transport = self._transports[transport_ns] |
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285 except KeyError: |
3028 | 286 raise exceptions.InternalError("Unkown transport") |
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287 yield content_data["transport"].handler.jingleHandler( |
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288 client, XEP_0166.A_DESTROY, session, content_name, None |
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289 ) |
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290 content_data["transport"] = transport |
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291 transport_data.clear() |
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292 |
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293 iq_elt, jingle_elt = self._buildJingleElt( |
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294 client, session, XEP_0166.A_TRANSPORT_REPLACE |
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295 ) |
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296 content_elt = jingle_elt.addElement("content") |
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297 content_elt["name"] = content_name |
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298 content_elt["creator"] = content_data["creator"] |
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299 |
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300 transport_elt = transport.handler.jingleSessionInit(client, session, content_name) |
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301 content_elt.addChild(transport_elt) |
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302 iq_elt.send() |
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303 |
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304 def buildAction(self, client, action, session, content_name): |
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305 """Build an element according to requested action |
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306 |
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307 @param action(unicode): a jingle action (see XEP-0166 §7.2), |
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308 session-* actions are not managed here |
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309 transport-replace is managed in the dedicated [transportReplace] method |
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310 @param session(dict): jingle session data |
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311 @param content_name(unicode): name of the content |
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312 @return (tuple[domish.Element, domish.Element]): parent <iq> element, <transport> or <description> element, according to action |
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313 """ |
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314 # we first build iq, jingle and content element which are the same in every cases |
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315 iq_elt, jingle_elt = self._buildJingleElt(client, session, action) |
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316 # FIXME: XEP-0260 § 2.3 Ex 5 has an initiator attribute, but it should not according to XEP-0166 §7.1 table 1, must be checked |
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317 content_data = session["contents"][content_name] |
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318 content_elt = jingle_elt.addElement("content") |
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319 content_elt["name"] = content_name |
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320 content_elt["creator"] = content_data["creator"] |
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321 |
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322 if action == XEP_0166.A_TRANSPORT_INFO: |
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323 context_elt = transport_elt = content_elt.addElement( |
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324 "transport", content_data["transport"].namespace |
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325 ) |
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326 transport_elt["sid"] = content_data["transport_data"]["sid"] |
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327 else: |
3028 | 328 raise exceptions.InternalError("unmanaged action {}".format(action)) |
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329 |
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330 return iq_elt, context_elt |
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331 |
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332 def buildSessionInfo(self, client, session): |
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333 """Build a session-info action |
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334 |
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335 @param session(dict): jingle session data |
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336 @return (tuple[domish.Element, domish.Element]): parent <iq> element, <jingle> element |
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337 """ |
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338 return self._buildJingleElt(client, session, XEP_0166.A_SESSION_INFO) |
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339 |
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340 def getApplication(self, namespace: str) -> object: |
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341 """Retreive application corresponding to a namespace |
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342 |
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343 @raise exceptions.NotFound if application can't be found |
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344 """ |
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345 try: |
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346 return self._applications[namespace] |
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347 except KeyError: |
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348 raise exceptions.NotFound( |
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349 f"No application registered for {namespace}" |
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350 ) |
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351 |
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352 def getContentData(self, content: dict) -> Tuple[object, list, dict, str]: |
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353 """"Retrieve application and its argument from content""" |
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354 app_ns = content["app_ns"] |
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355 try: |
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356 application = self.getApplication(app_ns) |
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357 except exceptions.NotFound as e: |
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358 raise exceptions.InternalError(str(e)) |
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359 app_args = content.get("app_args", []) |
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360 app_kwargs = content.get("app_kwargs", {}) |
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361 try: |
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362 content_name = content["name"] |
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363 except KeyError: |
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364 content_name = content["name"] = str(uuid.uuid4()) |
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365 return application, app_args, app_kwargs, content_name |
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366 |
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367 async def initiate(self, client, peer_jid, contents): |
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368 """Send a session initiation request |
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369 |
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370 @param peer_jid(jid.JID): jid to establith session with |
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371 @param contents(list[dict]): list of contents to use: |
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372 The dict must have the following keys: |
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373 - app_ns(unicode): namespace of the application |
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374 the following keys are optional: |
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375 - transport_type(unicode): type of transport to use (see XEP-0166 §8) |
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376 default to TRANSPORT_STREAMING |
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377 - name(unicode): name of the content |
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378 - senders(unicode): One of XEP_0166.ROLE_INITIATOR, XEP_0166.ROLE_RESPONDER, both or none |
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379 default to BOTH (see XEP-0166 §7.3) |
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380 - app_args(list): args to pass to the application plugin |
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381 - app_kwargs(dict): keyword args to pass to the application plugin |
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382 @return (unicode): jingle session id |
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383 """ |
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384 assert contents # there must be at least one content |
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385 if (peer_jid == client.jid |
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386 or client.is_component and peer_jid.host == client.jid.host): |
3028 | 387 raise ValueError(_("You can't do a jingle session with yourself")) |
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388 initiator = client.jid |
3028 | 389 sid = str(uuid.uuid4()) |
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390 # TODO: session cleaning after timeout ? |
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391 session = client.jingle_sessions[sid] = { |
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392 "id": sid, |
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393 "state": STATE_PENDING, |
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394 "initiator": initiator, |
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395 "role": XEP_0166.ROLE_INITIATOR, |
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396 "local_jid": client.jid, |
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397 "peer_jid": peer_jid, |
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398 "started": time.time(), |
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399 "contents": {}, |
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400 } |
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401 |
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402 if not await self.host.trigger.asyncPoint( |
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403 "XEP-0166_initiate", |
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404 client, session, contents |
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405 ): |
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406 return |
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407 |
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408 iq_elt, jingle_elt = self._buildJingleElt( |
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409 client, session, XEP_0166.A_SESSION_INITIATE |
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410 ) |
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411 jingle_elt["initiator"] = initiator.full() |
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412 |
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413 contents_dict = session["contents"] |
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414 |
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415 for content in contents: |
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416 # we get the application plugin |
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417 application, app_args, app_kwargs, content_name = self.getContentData(content) |
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418 |
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419 # and the transport plugin |
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420 transport_type = content.get("transport_type", XEP_0166.TRANSPORT_STREAMING) |
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421 try: |
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422 transport = self._type_transports[transport_type][0] |
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423 except IndexError: |
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424 raise exceptions.InternalError( |
3028 | 425 "No transport registered for {}".format(transport_type) |
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426 ) |
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427 |
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428 # we build the session data |
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429 content_data = { |
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430 "application": application, |
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431 "application_data": {}, |
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432 "transport": transport, |
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433 "transport_data": {}, |
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434 "creator": XEP_0166.ROLE_INITIATOR, |
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435 "senders": content.get("senders", "both"), |
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436 } |
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437 if content_name in contents_dict: |
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438 raise exceptions.InternalError( |
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439 "There is already a content with this name" |
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440 ) |
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441 contents_dict[content_name] = content_data |
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442 |
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443 # we construct the content element |
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444 content_elt = jingle_elt.addElement("content") |
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445 content_elt["creator"] = content_data["creator"] |
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446 content_elt["name"] = content_name |
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447 try: |
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448 content_elt["senders"] = content["senders"] |
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449 except KeyError: |
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450 pass |
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451 |
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452 # then the description element |
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453 desc_elt = await utils.asDeferred( |
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454 application.handler.jingleSessionInit, |
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455 client, session, content_name, *app_args, **app_kwargs |
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456 ) |
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457 content_elt.addChild(desc_elt) |
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458 |
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459 # and the transport one |
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460 transport_elt = await utils.asDeferred( |
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461 transport.handler.jingleSessionInit, |
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462 client, session, content_name |
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463 ) |
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464 content_elt.addChild(transport_elt) |
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465 |
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466 try: |
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467 await iq_elt.send() |
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468 except Exception as e: |
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469 failure_ = failure.Failure(e) |
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470 self._iqError(failure_, sid, client) |
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471 raise failure_ |
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472 |
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473 def delayedContentTerminate(self, *args, **kwargs): |
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474 """Put contentTerminate in queue but don't execute immediately |
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475 |
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476 This is used to terminate a content inside a handler, to avoid modifying contents |
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477 """ |
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478 reactor.callLater(0, self.contentTerminate, *args, **kwargs) |
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479 |
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480 def contentTerminate(self, client, session, content_name, reason=REASON_SUCCESS): |
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481 """Terminate and remove a content |
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482 |
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483 if there is no more content, then session is terminated |
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484 @param session(dict): jingle session |
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485 @param content_name(unicode): name of the content terminated |
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486 @param reason(unicode): reason of the termination |
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487 """ |
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488 contents = session["contents"] |
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489 del contents[content_name] |
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490 if not contents: |
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491 self.terminate(client, reason, session) |
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492 |
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493 ## defaults methods called when plugin doesn't have them ## |
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494 |
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495 def jingleRequestConfirmationDefault( |
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496 self, client, action, session, content_name, desc_elt |
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497 ): |
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498 """This method request confirmation for a jingle session""" |
3028 | 499 log.debug("Using generic jingle confirmation method") |
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500 return xml_tools.deferConfirm( |
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501 self.host, |
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502 _(CONFIRM_TXT).format(entity=session["peer_jid"].full()), |
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503 _("Confirm Jingle session"), |
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504 profile=client.profile, |
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505 ) |
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506 |
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507 ## jingle events ## |
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508 |
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509 def _onJingleRequest(self, request, client): |
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510 """Called when any jingle request is received |
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511 |
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512 The request will then be dispatched to appropriate method |
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513 according to current state |
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514 @param request(domish.Element): received IQ request |
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515 """ |
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516 request.handled = True |
3028 | 517 jingle_elt = next(request.elements(NS_JINGLE, "jingle")) |
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518 |
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519 # first we need the session id |
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520 try: |
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521 sid = jingle_elt["sid"] |
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522 if not sid: |
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523 raise KeyError |
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524 except KeyError: |
3028 | 525 log.warning("Received jingle request has no sid attribute") |
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526 self.sendError(client, "bad-request", None, request) |
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527 return |
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528 |
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529 # then the action |
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530 try: |
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531 action = jingle_elt["action"] |
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532 if not action: |
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533 raise KeyError |
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534 except KeyError: |
3028 | 535 log.warning("Received jingle request has no action") |
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536 self.sendError(client, "bad-request", None, request) |
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537 return |
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538 |
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539 peer_jid = jid.JID(request["from"]) |
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540 |
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541 # we get or create the session |
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542 try: |
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543 session = client.jingle_sessions[sid] |
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544 except KeyError: |
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545 if action == XEP_0166.A_SESSION_INITIATE: |
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546 pass |
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547 elif action == XEP_0166.A_SESSION_TERMINATE: |
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548 log.debug( |
3028 | 549 "ignoring session terminate action (inexisting session id): {request_id} [{profile}]".format( |
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550 request_id=sid, profile=client.profile |
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551 ) |
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552 ) |
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553 return |
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554 else: |
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555 log.warning( |
3028 | 556 "Received request for an unknown session id: {request_id} [{profile}]".format( |
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557 request_id=sid, profile=client.profile |
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558 ) |
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559 ) |
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560 self.sendError(client, "item-not-found", None, request, "unknown-session") |
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561 return |
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562 |
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563 session = client.jingle_sessions[sid] = { |
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564 "id": sid, |
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565 "state": STATE_PENDING, |
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566 "initiator": peer_jid, |
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567 "role": XEP_0166.ROLE_RESPONDER, |
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568 # we store local_jid using request['to'] because for a component the jid |
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569 # used may not be client.jid (if a local part is used). |
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570 "local_jid": jid.JID(request['to']), |
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571 "peer_jid": peer_jid, |
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572 "started": time.time(), |
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573 } |
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574 else: |
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575 if session["peer_jid"] != peer_jid: |
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576 log.warning( |
3028 | 577 "sid conflict ({}), the jid doesn't match. Can be a collision, a hack attempt, or a bad sid generation".format( |
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578 sid |
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579 ) |
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580 ) |
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581 self.sendError(client, "service-unavailable", sid, request) |
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582 return |
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583 if session["id"] != sid: |
3028 | 584 log.error("session id doesn't match") |
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585 self.sendError(client, "service-unavailable", sid, request) |
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586 raise exceptions.InternalError |
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587 |
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588 if action == XEP_0166.A_SESSION_INITIATE: |
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589 self.onSessionInitiate(client, request, jingle_elt, session) |
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590 elif action == XEP_0166.A_SESSION_TERMINATE: |
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591 self.onSessionTerminate(client, request, jingle_elt, session) |
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592 elif action == XEP_0166.A_SESSION_ACCEPT: |
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593 self.onSessionAccept(client, request, jingle_elt, session) |
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594 elif action == XEP_0166.A_SESSION_INFO: |
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595 self.onSessionInfo(client, request, jingle_elt, session) |
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596 elif action == XEP_0166.A_TRANSPORT_INFO: |
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597 self.onTransportInfo(client, request, jingle_elt, session) |
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598 elif action == XEP_0166.A_TRANSPORT_REPLACE: |
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599 self.onTransportReplace(client, request, jingle_elt, session) |
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600 elif action == XEP_0166.A_TRANSPORT_ACCEPT: |
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601 self.onTransportAccept(client, request, jingle_elt, session) |
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602 elif action == XEP_0166.A_TRANSPORT_REJECT: |
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603 self.onTransportReject(client, request, jingle_elt, session) |
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604 else: |
3028 | 605 raise exceptions.InternalError("Unknown action {}".format(action)) |
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606 |
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607 ## Actions callbacks ## |
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608 |
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609 def _parseElements( |
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610 self, |
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611 jingle_elt, |
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612 session, |
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613 request, |
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614 client, |
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615 new=False, |
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616 creator=ROLE_INITIATOR, |
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617 with_application=True, |
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618 with_transport=True, |
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619 ): |
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620 """Parse contents elements and fill contents_dict accordingly |
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621 |
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622 after the parsing, contents_dict will containt handlers, "desc_elt" and "transport_elt" |
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623 @param jingle_elt(domish.Element): parent <jingle> element, containing one or more <content> |
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624 @param session(dict): session data |
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625 @param request(domish.Element): the whole request |
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626 @param client: %(doc_client)s |
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627 @param new(bool): True if the content is new and must be created, |
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628 else the content must exists, and session data will be filled |
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629 @param creator(unicode): only used if new is True: creating pear (see § 7.3) |
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630 @param with_application(bool): if True, raise an error if there is no <description> element else ignore it |
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631 @param with_transport(bool): if True, raise an error if there is no <transport> element else ignore it |
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632 @raise exceptions.CancelError: the error is treated and the calling method can cancel the treatment (i.e. return) |
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633 """ |
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634 contents_dict = session["contents"] |
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635 content_elts = jingle_elt.elements(NS_JINGLE, "content") |
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636 |
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637 for content_elt in content_elts: |
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638 name = content_elt["name"] |
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639 |
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640 if new: |
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641 # the content must not exist, we check it |
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642 if not name or name in contents_dict: |
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643 self.sendError(client, "bad-request", session["id"], request) |
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644 raise exceptions.CancelError |
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645 content_data = contents_dict[name] = { |
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646 "creator": creator, |
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647 "senders": content_elt.attributes.get("senders", "both"), |
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648 } |
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649 else: |
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650 # the content must exist, we check it |
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651 try: |
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652 content_data = contents_dict[name] |
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653 except KeyError: |
3028 | 654 log.warning("Other peer try to access an unknown content") |
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655 self.sendError(client, "bad-request", session["id"], request) |
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656 raise exceptions.CancelError |
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|
657 |
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658 # application |
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659 if with_application: |
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660 desc_elt = content_elt.description |
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661 if not desc_elt: |
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662 self.sendError(client, "bad-request", session["id"], request) |
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663 raise exceptions.CancelError |
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664 |
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665 if new: |
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666 # the content is new, we need to check and link the application |
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667 app_ns = desc_elt.uri |
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668 if not app_ns or app_ns == NS_JINGLE: |
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669 self.sendError(client, "bad-request", session["id"], request) |
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670 raise exceptions.CancelError |
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671 |
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672 try: |
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673 application = self._applications[app_ns] |
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674 except KeyError: |
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675 log.warning( |
3028 | 676 "Unmanaged application namespace [{}]".format(app_ns) |
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677 ) |
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|
678 self.sendError( |
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679 client, "service-unavailable", session["id"], request |
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680 ) |
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681 raise exceptions.CancelError |
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682 |
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683 content_data["application"] = application |
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684 content_data["application_data"] = {} |
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685 else: |
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686 # the content exists, we check that we have not a former desc_elt |
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687 if "desc_elt" in content_data: |
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688 raise exceptions.InternalError( |
3028 | 689 "desc_elt should not exist at this point" |
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690 ) |
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691 |
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692 content_data["desc_elt"] = desc_elt |
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693 |
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|
694 # transport |
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695 if with_transport: |
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696 transport_elt = content_elt.transport |
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697 if not transport_elt: |
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698 self.sendError(client, "bad-request", session["id"], request) |
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699 raise exceptions.CancelError |
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700 |
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701 if new: |
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702 # the content is new, we need to check and link the transport |
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703 transport_ns = transport_elt.uri |
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704 if not app_ns or app_ns == NS_JINGLE: |
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705 self.sendError(client, "bad-request", session["id"], request) |
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706 raise exceptions.CancelError |
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707 |
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708 try: |
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709 transport = self._transports[transport_ns] |
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710 except KeyError: |
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711 raise exceptions.InternalError( |
3028 | 712 "No transport registered for namespace {}".format( |
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713 transport_ns |
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714 ) |
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715 ) |
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716 content_data["transport"] = transport |
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717 content_data["transport_data"] = {} |
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718 else: |
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719 # the content exists, we check that we have not a former transport_elt |
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720 if "transport_elt" in content_data: |
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721 raise exceptions.InternalError( |
3028 | 722 "transport_elt should not exist at this point" |
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723 ) |
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724 |
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725 content_data["transport_elt"] = transport_elt |
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726 |
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727 def _ignore(self, client, action, session, content_name, elt): |
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728 """Dummy method used when not exception must be raised if a method is not implemented in _callPlugins |
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|
729 |
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|
730 must be used as app_default_cb and/or transp_default_cb |
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731 """ |
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732 return elt |
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733 |
3040 | 734 def _callPlugins(self, client, action, session, app_method_name="jingleHandler", |
735 transp_method_name="jingleHandler", app_default_cb=None, | |
736 transp_default_cb=None, delete=True, elements=True, | |
737 force_element=None): | |
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738 """Call application and transport plugin methods for all contents |
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739 |
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740 @param action(unicode): jingle action name |
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741 @param session(dict): jingle session data |
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|
742 @param app_method_name(unicode, None): name of the method to call for applications |
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|
743 None to ignore |
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|
744 @param transp_method_name(unicode, None): name of the method to call for transports |
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|
745 None to ignore |
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746 @param app_default_cb(callable, None): default callback to use if plugin has not app_method_name |
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|
747 None to raise an exception instead |
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|
748 @param transp_default_cb(callable, None): default callback to use if plugin has not transp_method_name |
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|
749 None to raise an exception instead |
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|
750 @param delete(bool): if True, remove desc_elt and transport_elt from session |
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|
751 ignored if elements is False |
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|
752 @param elements(bool): True if elements(desc_elt and tranport_elt) must be managed |
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753 must be True if _callPlugins is used in a request, and False if it used after a request |
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|
754 (i.e. on <iq> result or error) |
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755 @param force_element(None, domish.Element, object): if elements is False, it is used as element parameter |
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|
756 else it is ignored |
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757 @return (list[defer.Deferred]): list of launched Deferred |
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758 @raise exceptions.NotFound: method is not implemented |
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759 """ |
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760 contents_dict = session["contents"] |
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|
761 defers_list = [] |
3028 | 762 for content_name, content_data in contents_dict.items(): |
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763 for method_name, handler_key, default_cb, elt_name in ( |
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764 (app_method_name, "application", app_default_cb, "desc_elt"), |
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765 (transp_method_name, "transport", transp_default_cb, "transport_elt"), |
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|
766 ): |
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|
767 if method_name is None: |
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|
768 continue |
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|
769 |
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770 handler = content_data[handler_key].handler |
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|
771 try: |
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|
772 method = getattr(handler, method_name) |
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|
773 except AttributeError: |
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774 if default_cb is None: |
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|
775 raise exceptions.NotFound( |
3028 | 776 "{} not implemented !".format(method_name) |
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777 ) |
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|
778 else: |
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779 method = default_cb |
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|
780 if elements: |
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|
781 elt = content_data.pop(elt_name) if delete else content_data[elt_name] |
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|
782 else: |
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|
783 elt = force_element |
3333
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|
784 d = utils.asDeferred( |
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|
785 method, client, action, session, content_name, elt |
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|
786 ) |
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|
787 defers_list.append(d) |
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|
788 |
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|
789 return defers_list |
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|
790 |
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|
791 def onSessionInitiate(self, client, request, jingle_elt, session): |
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792 """Called on session-initiate action |
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|
793 |
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|
794 The "jingleRequestConfirmation" method of each application will be called |
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|
795 (or self.jingleRequestConfirmationDefault if the former doesn't exist). |
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|
796 The session is only accepted if all application are confirmed. |
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|
797 The application must manage itself multiple contents scenari (e.g. audio/video). |
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|
798 @param client: %(doc_client)s |
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|
799 @param request(domish.Element): full request |
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|
800 @param jingle_elt(domish.Element): <jingle> element |
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|
801 @param session(dict): session data |
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|
802 """ |
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|
803 if "contents" in session: |
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|
804 raise exceptions.InternalError( |
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|
805 "Contents dict should not already exist at this point" |
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|
806 ) |
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|
807 session["contents"] = contents_dict = {} |
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808 |
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809 try: |
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810 self._parseElements( |
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811 jingle_elt, session, request, client, True, XEP_0166.ROLE_INITIATOR |
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812 ) |
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813 except exceptions.CancelError: |
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814 return |
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815 |
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816 if not contents_dict: |
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817 # there MUST be at least one content |
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818 self.sendError(client, "bad-request", session["id"], request) |
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819 return |
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820 |
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821 # at this point we can send the <iq/> result to confirm reception of the request |
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822 client.send(xmlstream.toResponse(request, "result")) |
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823 |
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824 # we now request each application plugin confirmation |
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825 # and if all are accepted, we can accept the session |
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826 confirm_defers = self._callPlugins( |
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827 client, |
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828 XEP_0166.A_SESSION_INITIATE, |
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829 session, |
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830 "jingleRequestConfirmation", |
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831 None, |
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832 self.jingleRequestConfirmationDefault, |
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833 delete=False, |
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834 ) |
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835 |
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836 confirm_dlist = defer.gatherResults(confirm_defers) |
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837 confirm_dlist.addCallback(self._confirmationCb, session, jingle_elt, client) |
3040 | 838 confirm_dlist.addErrback(self._jingleErrorCb, session, request, client) |
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839 |
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840 def _confirmationCb(self, confirm_results, session, jingle_elt, client): |
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841 """Method called when confirmation from user has been received |
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842 |
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843 This method is only called for the responder |
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844 @param confirm_results(list[bool]): all True if session is accepted |
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845 @param session(dict): session data |
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846 @param jingle_elt(domish.Element): jingle data of this session |
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847 @param client: %(doc_client)s |
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848 """ |
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849 confirmed = all(confirm_results) |
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850 if not confirmed: |
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851 return self.terminate(client, XEP_0166.REASON_DECLINE, session) |
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852 |
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853 iq_elt, jingle_elt = self._buildJingleElt( |
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854 client, session, XEP_0166.A_SESSION_ACCEPT |
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855 ) |
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856 jingle_elt["responder"] = session['local_jid'].full() |
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857 |
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858 # contents |
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859 |
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860 def addElement(domish_elt, content_elt): |
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861 content_elt.addChild(domish_elt) |
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862 |
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863 defers_list = [] |
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864 |
3028 | 865 for content_name, content_data in session["contents"].items(): |
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866 content_elt = jingle_elt.addElement("content") |
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867 content_elt["creator"] = XEP_0166.ROLE_INITIATOR |
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868 content_elt["name"] = content_name |
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869 |
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870 application = content_data["application"] |
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871 app_session_accept_cb = application.handler.jingleHandler |
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872 |
3333
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873 app_d = utils.asDeferred( |
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874 app_session_accept_cb, |
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875 client, |
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876 XEP_0166.A_SESSION_INITIATE, |
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877 session, |
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878 content_name, |
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879 content_data.pop("desc_elt"), |
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880 ) |
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881 app_d.addCallback(addElement, content_elt) |
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882 defers_list.append(app_d) |
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883 |
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884 transport = content_data["transport"] |
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885 transport_session_accept_cb = transport.handler.jingleHandler |
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886 |
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887 transport_d = utils.asDeferred( |
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888 transport_session_accept_cb, |
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889 client, |
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890 XEP_0166.A_SESSION_INITIATE, |
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891 session, |
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892 content_name, |
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893 content_data.pop("transport_elt"), |
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894 ) |
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|
895 transport_d.addCallback(addElement, content_elt) |
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896 defers_list.append(transport_d) |
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897 |
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898 d_list = defer.DeferredList(defers_list) |
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899 d_list.addCallback( |
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|
900 lambda __: self._callPlugins( |
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901 client, |
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|
902 XEP_0166.A_PREPARE_RESPONDER, |
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|
903 session, |
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904 app_method_name=None, |
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|
905 elements=False, |
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|
906 ) |
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907 ) |
2765
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|
908 d_list.addCallback(lambda __: iq_elt.send()) |
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909 |
2765
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|
910 def changeState(__, session): |
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911 session["state"] = STATE_ACTIVE |
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912 |
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|
913 d_list.addCallback(changeState, session) |
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|
914 d_list.addCallback( |
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|
915 lambda __: self._callPlugins( |
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916 client, XEP_0166.A_ACCEPTED_ACK, session, elements=False |
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|
917 ) |
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|
918 ) |
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|
919 d_list.addErrback(self._iqError, session["id"], client) |
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920 return d_list |
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921 |
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|
922 def onSessionTerminate(self, client, request, jingle_elt, session): |
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|
923 # TODO: check reason, display a message to user if needed |
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924 log.debug("Jingle Session {} terminated".format(session["id"])) |
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925 try: |
3028 | 926 reason_elt = next(jingle_elt.elements(NS_JINGLE, "reason")) |
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927 except StopIteration: |
3028 | 928 log.warning("No reason given for session termination") |
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929 reason_elt = jingle_elt.addElement("reason") |
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930 |
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931 terminate_defers = self._callPlugins( |
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932 client, |
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933 XEP_0166.A_SESSION_TERMINATE, |
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934 session, |
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935 "jingleTerminate", |
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936 "jingleTerminate", |
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937 self._ignore, |
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938 self._ignore, |
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939 elements=False, |
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940 force_element=reason_elt, |
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941 ) |
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942 terminate_dlist = defer.DeferredList(terminate_defers) |
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943 |
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944 terminate_dlist.addCallback(lambda __: self._delSession(client, session["id"])) |
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945 client.send(xmlstream.toResponse(request, "result")) |
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946 |
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947 def onSessionAccept(self, client, request, jingle_elt, session): |
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948 """Method called once session is accepted |
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949 |
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950 This method is only called for initiator |
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951 @param client: %(doc_client)s |
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952 @param request(domish.Element): full <iq> request |
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953 @param jingle_elt(domish.Element): the <jingle> element |
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954 @param session(dict): session data |
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955 """ |
3028 | 956 log.debug("Jingle session {} has been accepted".format(session["id"])) |
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957 |
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958 try: |
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959 self._parseElements(jingle_elt, session, request, client) |
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960 except exceptions.CancelError: |
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961 return |
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962 |
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963 # at this point we can send the <iq/> result to confirm reception of the request |
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964 client.send(xmlstream.toResponse(request, "result")) |
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965 # and change the state |
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966 session["state"] = STATE_ACTIVE |
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967 |
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968 negociate_defers = [] |
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969 negociate_defers = self._callPlugins(client, XEP_0166.A_SESSION_ACCEPT, session) |
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970 |
3040 | 971 negociate_dlist = defer.gatherResults(negociate_defers) |
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972 |
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973 # after negociations we start the transfer |
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974 negociate_dlist.addCallback( |
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975 lambda __: self._callPlugins( |
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976 client, XEP_0166.A_START, session, app_method_name=None, elements=False |
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977 ) |
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978 ) |
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979 |
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980 def _onSessionCb(self, result, client, request, jingle_elt, session): |
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981 client.send(xmlstream.toResponse(request, "result")) |
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982 |
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983 def _onSessionEb(self, failure_, client, request, jingle_elt, session): |
3028 | 984 log.error("Error while handling onSessionInfo: {}".format(failure_.value)) |
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985 # XXX: only error managed so far, maybe some applications/transports need more |
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986 self.sendError( |
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987 client, "feature-not-implemented", None, request, "unsupported-info" |
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988 ) |
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989 |
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990 def onSessionInfo(self, client, request, jingle_elt, session): |
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991 """Method called when a session-info action is received from other peer |
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992 |
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993 This method is only called for initiator |
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994 @param client: %(doc_client)s |
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995 @param request(domish.Element): full <iq> request |
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996 @param jingle_elt(domish.Element): the <jingle> element |
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997 @param session(dict): session data |
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998 """ |
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999 if not jingle_elt.children: |
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1000 # this is a session ping, see XEP-0166 §6.8 |
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1001 client.send(xmlstream.toResponse(request, "result")) |
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1002 return |
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1003 |
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1004 try: |
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1005 # XXX: session-info is most likely only used for application, so we don't call transport plugins |
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1006 # if a future transport use it, this behaviour must be adapted |
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1007 defers = self._callPlugins( |
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1008 client, |
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1009 XEP_0166.A_SESSION_INFO, |
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1010 session, |
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1011 "jingleSessionInfo", |
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1012 None, |
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1013 elements=False, |
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1014 force_element=jingle_elt, |
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1015 ) |
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1016 except exceptions.NotFound as e: |
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1017 self._onSessionEb(failure.Failure(e), client, request, jingle_elt, session) |
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1018 return |
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1019 |
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1020 dlist = defer.DeferredList(defers, fireOnOneErrback=True) |
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1021 dlist.addCallback(self._onSessionCb, client, request, jingle_elt, session) |
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1022 dlist.addErrback(self._onSessionCb, client, request, jingle_elt, session) |
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1023 |
1630
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1024 @defer.inlineCallbacks |
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1025 def onTransportReplace(self, client, request, jingle_elt, session): |
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1026 """A transport change is requested |
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1027 |
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1028 The request is parsed, and jingleHandler is called on concerned transport plugin(s) |
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1029 @param client: %(doc_client)s |
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1030 @param request(domish.Element): full <iq> request |
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1031 @param jingle_elt(domish.Element): the <jingle> element |
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1032 @param session(dict): session data |
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1033 """ |
3028 | 1034 log.debug("Other peer wants to replace the transport") |
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1035 try: |
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1036 self._parseElements( |
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1037 jingle_elt, session, request, client, with_application=False |
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1038 ) |
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1039 except exceptions.CancelError: |
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1040 defer.returnValue(None) |
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1041 |
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1042 client.send(xmlstream.toResponse(request, "result")) |
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1043 |
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1044 content_name = None |
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1045 to_replace = [] |
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1046 |
3028 | 1047 for content_name, content_data in session["contents"].items(): |
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1048 try: |
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1049 transport_elt = content_data.pop("transport_elt") |
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1050 except KeyError: |
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1051 continue |
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1052 transport_ns = transport_elt.uri |
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1053 try: |
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1054 transport = self._transports[transport_ns] |
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1055 except KeyError: |
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1056 log.warning( |
3028 | 1057 "Other peer want to replace current transport with an unknown one: {}".format( |
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1058 transport_ns |
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1059 ) |
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1060 ) |
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1061 content_name = None |
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1062 break |
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1063 to_replace.append((content_name, content_data, transport, transport_elt)) |
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1064 |
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1065 if content_name is None: |
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1066 # wa can't accept the replacement |
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1067 iq_elt, reject_jingle_elt = self._buildJingleElt( |
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1068 client, session, XEP_0166.A_TRANSPORT_REJECT |
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1069 ) |
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1070 for child in jingle_elt.children: |
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1071 reject_jingle_elt.addChild(child) |
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1072 |
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1073 iq_elt.send() |
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1074 defer.returnValue(None) |
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1075 |
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1076 # at this point, everything is alright and we can replace the transport(s) |
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1077 # this is similar to an session-accept action, but for transports only |
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1078 iq_elt, accept_jingle_elt = self._buildJingleElt( |
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1079 client, session, XEP_0166.A_TRANSPORT_ACCEPT |
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1080 ) |
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1081 for content_name, content_data, transport, transport_elt in to_replace: |
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1082 # we can now actually replace the transport |
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1083 yield content_data["transport"].handler.jingleHandler( |
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1084 client, XEP_0166.A_DESTROY, session, content_name, None |
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1085 ) |
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1086 content_data["transport"] = transport |
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1087 content_data["transport_data"].clear() |
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1088 # and build the element |
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1089 content_elt = accept_jingle_elt.addElement("content") |
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1090 content_elt["name"] = content_name |
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1091 content_elt["creator"] = content_data["creator"] |
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1092 # we notify the transport and insert its <transport/> in the answer |
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1093 accept_transport_elt = yield transport.handler.jingleHandler( |
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1094 client, XEP_0166.A_TRANSPORT_REPLACE, session, content_name, transport_elt |
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1095 ) |
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1096 content_elt.addChild(accept_transport_elt) |
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1097 # there is no confirmation needed here, so we can directly prepare it |
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1098 yield transport.handler.jingleHandler( |
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1099 client, XEP_0166.A_PREPARE_RESPONDER, session, content_name, None |
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1100 ) |
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1101 |
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1102 iq_elt.send() |
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1103 |
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1104 def onTransportAccept(self, client, request, jingle_elt, session): |
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1105 """Method called once transport replacement is accepted |
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1106 |
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1107 @param client: %(doc_client)s |
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1108 @param request(domish.Element): full <iq> request |
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1109 @param jingle_elt(domish.Element): the <jingle> element |
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1110 @param session(dict): session data |
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1111 """ |
3028 | 1112 log.debug("new transport has been accepted") |
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1113 |
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1114 try: |
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1115 self._parseElements( |
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1116 jingle_elt, session, request, client, with_application=False |
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1117 ) |
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1118 except exceptions.CancelError: |
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1119 return |
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1120 |
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1121 # at this point we can send the <iq/> result to confirm reception of the request |
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1122 client.send(xmlstream.toResponse(request, "result")) |
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1123 |
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1124 negociate_defers = [] |
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1125 negociate_defers = self._callPlugins( |
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1126 client, XEP_0166.A_TRANSPORT_ACCEPT, session, app_method_name=None |
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1127 ) |
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1128 |
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1129 negociate_dlist = defer.DeferredList(negociate_defers) |
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1130 |
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1131 # after negociations we start the transfer |
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1132 negociate_dlist.addCallback( |
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1133 lambda __: self._callPlugins( |
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1134 client, XEP_0166.A_START, session, app_method_name=None, elements=False |
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1135 ) |
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1136 ) |
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1137 |
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1138 def onTransportReject(self, client, request, jingle_elt, session): |
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1139 """Method called when a transport replacement is refused |
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1140 |
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1141 @param client: %(doc_client)s |
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1142 @param request(domish.Element): full <iq> request |
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1143 @param jingle_elt(domish.Element): the <jingle> element |
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1144 @param session(dict): session data |
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1145 """ |
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1146 # XXX: for now, we terminate the session in case of transport-reject |
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1147 # this behaviour may change in the future |
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1148 self.terminate(client, "failed-transport", session) |
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1149 |
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1150 def onTransportInfo(self, client, request, jingle_elt, session): |
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1151 """Method called when a transport-info action is received from other peer |
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1152 |
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1153 The request is parsed, and jingleHandler is called on concerned transport plugin(s) |
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1154 @param client: %(doc_client)s |
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1155 @param request(domish.Element): full <iq> request |
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1156 @param jingle_elt(domish.Element): the <jingle> element |
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1157 @param session(dict): session data |
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1158 """ |
3028 | 1159 log.debug("Jingle session {} has been accepted".format(session["id"])) |
1556
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1160 |
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1161 try: |
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1162 self._parseElements( |
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1163 jingle_elt, session, request, client, with_application=False |
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1164 ) |
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1165 except exceptions.CancelError: |
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1166 return |
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1167 |
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1168 # The parsing was OK, we send the <iq> result |
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1169 client.send(xmlstream.toResponse(request, "result")) |
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1170 |
3028 | 1171 for content_name, content_data in session["contents"].items(): |
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1172 try: |
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1173 transport_elt = content_data.pop("transport_elt") |
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1174 except KeyError: |
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1175 continue |
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1176 else: |
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1177 content_data["transport"].handler.jingleHandler( |
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1178 client, |
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1179 XEP_0166.A_TRANSPORT_INFO, |
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1180 session, |
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1181 content_name, |
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1182 transport_elt, |
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1183 ) |
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1184 |
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1185 |
3028 | 1186 @implementer(iwokkel.IDisco) |
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1187 class XEP_0166_handler(xmlstream.XMPPHandler): |
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1188 |
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1189 def __init__(self, plugin_parent): |
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1190 self.plugin_parent = plugin_parent |
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1191 |
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1192 def connectionInitialized(self): |
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1193 self.xmlstream.addObserver( |
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1194 JINGLE_REQUEST, self.plugin_parent._onJingleRequest, client=self.parent |
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1195 ) |
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1196 |
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1197 def getDiscoInfo(self, requestor, target, nodeIdentifier=""): |
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1198 return [disco.DiscoFeature(NS_JINGLE)] |
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1199 |
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1200 def getDiscoItems(self, requestor, target, nodeIdentifier=""): |
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1201 return [] |