Mercurial > libervia-backend
annotate libervia/backend/plugins/plugin_xep_0343.py @ 4232:0fbe5c605eb6
tests (unit/webrtc,XEP-0176, XEP-0234): Fix tests and add webrtc file transfer tests:
fix 441
author | Goffi <goffi@goffi.org> |
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date | Sat, 06 Apr 2024 12:59:50 +0200 (8 months ago) |
parents | e11b13418ba6 |
children | 79c8a70e1813 |
rev | line source |
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4231
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1 #!/usr/bin/env python3 |
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2 |
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3 # Libervia plugin |
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4 # Copyright (C) 2009-2022 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 from typing import Final |
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20 |
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21 from twisted.internet import defer, reactor |
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22 from twisted.words.protocols.jabber import jid |
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23 from twisted.words.protocols.jabber.xmlstream import XMPPHandler |
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24 from twisted.words.xish import domish |
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25 from wokkel import disco, iwokkel |
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26 from zope.interface import implementer |
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27 |
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28 from libervia.backend.core import exceptions |
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29 from libervia.backend.core.constants import Const as C |
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30 from libervia.backend.core.i18n import _ |
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31 from libervia.backend.core.log import getLogger |
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32 from libervia.backend.core.xmpp import SatXMPPEntity |
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33 from libervia.backend.plugins.plugin_xep_0166.models import BaseTransportHandler, ContentData |
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34 from libervia.backend.tools.common import data_format |
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35 |
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36 from .plugin_xep_0167 import mapping |
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37 |
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38 log = getLogger(__name__) |
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39 |
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40 |
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41 PLUGIN_INFO = { |
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42 C.PI_NAME: "WebRTC datachannels in Jingle", |
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43 C.PI_IMPORT_NAME: "XEP-0343", |
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44 C.PI_TYPE: "XEP", |
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45 C.PI_MODES: C.PLUG_MODE_BOTH, |
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46 C.PI_PROTOCOLS: [], |
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47 C.PI_DEPENDENCIES: ["XEP-0166", "XEP-0167", "XEP-0176", "XEP-0234", "XEP-0320"], |
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48 C.PI_RECOMMENDATIONS: [], |
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49 C.PI_MAIN: "XEP_0343", |
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50 C.PI_HANDLER: "yes", |
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51 C.PI_DESCRIPTION: _("""Use WebRTC to create a generic data transport."""), |
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52 } |
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53 NS_JINGLE_WEBRTC_DATACHANNELS: Final[ |
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54 str |
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55 ] = "urn:xmpp:jingle:transports:webrtc-datachannel:1" |
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56 |
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57 |
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58 class XEP_0343(BaseTransportHandler): |
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59 namespace = NS_JINGLE_WEBRTC_DATACHANNELS |
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60 |
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61 def __init__(self, host): |
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62 log.info(f"plugin {PLUGIN_INFO[C.PI_NAME]!r} initialization") |
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63 self.host = host |
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64 self._ice_udp = host.plugins["XEP-0176"] |
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65 self._j = host.plugins["XEP-0166"] |
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66 self._j.register_transport( |
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67 NS_JINGLE_WEBRTC_DATACHANNELS, self._j.TRANSPORT_STREAMING, self, 10000 |
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68 ) |
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69 self._rtp = host.plugins["XEP-0167"] |
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70 host.trigger.add("XEP-0167_parse_sdp_a", self._parse_sdp_a_trigger) |
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71 host.trigger.add( |
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72 "XEP-0167_generate_sdp_content", self._generate_sdp_content_trigger |
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73 ) |
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74 host.trigger.add("XEP-0176_jingle_handler_send_buffer", self._on_send_ice_buffer) |
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75 host.trigger.add("XEP-0176_ice_candidate_send", self._on_ice_candidate_send) |
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76 host.trigger.add( |
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77 "XEP-0234_file_jingle_send", self._file_jingle_send |
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78 ) |
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79 |
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80 def get_handler(self, client: SatXMPPEntity): |
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81 return XEP0343Handler() |
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82 |
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83 def is_usable(self, client, content_data: ContentData) -> bool: |
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84 try: |
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85 return content_data.app_kwargs["extra"]["webrtc"] |
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86 except KeyError: |
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87 return False |
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88 |
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89 def _parse_sdp_a_trigger( |
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90 self, |
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91 attribute: str, |
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92 parts: list[str], |
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93 call_data: dict, |
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94 metadata: dict, |
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95 media_type: str, |
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96 application_data: dict, |
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97 transport_data: dict, |
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98 ) -> None: |
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99 """Parse "sctp-port" and "max-message-size" attributes""" |
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100 try: |
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101 if attribute == "sctp-port": |
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102 transport_data["sctp-port"] = int(parts[0]) |
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103 elif attribute == "max-message-size": |
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104 transport_data["max-message-size"] = int(parts[0]) |
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105 except ValueError: |
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106 log.warning(f"Can't parse value of {attribute}, ignoring: {parts}") |
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107 |
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108 def _generate_sdp_content_trigger( |
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109 self, |
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110 session: dict, |
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111 local: bool, |
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112 idx: int, |
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113 content_data: dict, |
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114 sdp_lines: list[str], |
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115 application_data: dict, |
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116 app_data_key: str, |
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117 media_data: dict, |
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118 media: str |
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119 ) -> None: |
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120 """Generate "sctp-port" and "max-message-size" attributes""" |
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121 transport_data = content_data["transport_data"] |
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122 sctp_port = transport_data.get("sctp-port") |
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123 if sctp_port is not None: |
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124 sdp_lines.append(f"a=sctp-port:{sctp_port}") |
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125 |
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126 max_message_size = transport_data.get("max-message-size") |
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127 if max_message_size is not None: |
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128 sdp_lines.append(f"a=max-message-size:{max_message_size}") |
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129 |
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130 def _wrap_transport_element( |
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131 self, |
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132 transport_elt: domish.Element |
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133 ) -> None: |
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134 """Wrap the XEP-0176 transport in a transport with this XEP namespace |
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135 |
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136 @param transport_elt: ICE UDP <transport>. Must be already a child of a <content> |
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137 element. |
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138 """ |
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139 content_elt = transport_elt.parent |
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140 if content_elt is None or not content_elt.name == "content": |
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141 raise exceptions.InternalError("Was expecting <content> element.") |
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142 content_elt.children.remove(transport_elt) |
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143 wrapping_transport_elt = content_elt.addElement( |
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144 (NS_JINGLE_WEBRTC_DATACHANNELS, "transport") |
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145 ) |
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146 wrapping_transport_elt.addChild(transport_elt) |
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147 |
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148 def _on_send_ice_buffer( |
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149 self, |
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150 client: SatXMPPEntity, |
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151 session: dict, |
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152 content_name: str, |
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153 content_data: dict, |
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154 transport_elt: domish.Element, |
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155 iq_elt: domish.Element |
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156 ) -> bool: |
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157 if content_data["transport"].handler == self: |
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158 self._wrap_transport_element(transport_elt) |
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159 return True |
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160 |
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161 def _on_ice_candidate_send( |
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162 self, |
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163 client: SatXMPPEntity, |
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164 session: dict, |
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165 media_ice_data: dict[str, dict], |
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166 content_name: str, |
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167 content_data: dict, |
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168 iq_elt: domish.Element |
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169 ) -> bool: |
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170 if content_data["transport"].handler == self: |
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171 transport_elt = iq_elt.jingle.content.transport |
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172 if transport_elt.uri != self._ice_udp.namespace: |
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173 raise exceptions.InternalError("Was expecting an ICE UDP transport") |
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174 self._wrap_transport_element(transport_elt) |
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175 return True |
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176 |
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177 async def _file_jingle_send( |
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178 self, |
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179 client: SatXMPPEntity, |
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180 peer_jid: jid.JID, |
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181 content: dict |
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182 ) -> None: |
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183 call_data = content["app_kwargs"]["extra"].pop("call_data", None) |
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184 if call_data: |
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185 metadata = self._rtp.parse_call_data(call_data) |
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186 try: |
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187 application_data = call_data["application"] |
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188 except KeyError: |
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189 raise exceptions.DataError( |
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190 '"call_data" must have an application media.' |
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191 ) |
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192 try: |
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193 content["transport_data"] = { |
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194 "sctp-port": metadata["sctp-port"], |
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195 "max-message-size": metadata.get("max-message-size", 65536), |
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196 "local_ice_data": { |
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197 "ufrag": metadata["ice-ufrag"], |
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198 "pwd": metadata["ice-pwd"], |
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199 "candidates": application_data.pop("ice-candidates"), |
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200 "fingerprint": application_data.pop("fingerprint", {}), |
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201 } |
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202 } |
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203 except KeyError as e: |
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204 raise exceptions.DataError(f"Mandatory key is missing: {e}") |
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205 |
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206 async def jingle_session_init( |
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207 self, |
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208 client: SatXMPPEntity, |
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209 session: dict, |
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210 content_name: str, |
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211 ) -> domish.Element: |
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212 content_data = session["contents"][content_name] |
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213 transport_data = content_data["transport_data"] |
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214 ice_transport_elt = await self._ice_udp.jingle_session_init( |
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215 client, |
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216 session, |
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217 content_name |
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218 ) |
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219 transport_elt = domish.Element( |
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220 (NS_JINGLE_WEBRTC_DATACHANNELS, "transport"), |
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221 attribs={ |
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222 "sctp-port": str(transport_data["sctp-port"]), |
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223 "max-message-size": str(transport_data["max-message-size"]) |
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224 } |
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225 ) |
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226 transport_elt.addChild(ice_transport_elt) |
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227 return transport_elt |
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228 |
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229 async def _call_ice_udp_handler( |
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230 self, |
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231 client: SatXMPPEntity, |
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232 action: str, |
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233 session: dict, |
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234 content_name: str, |
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235 transport_elt: domish.Element, |
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236 ): |
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237 """Unwrap XEP-0176 <transport> element, and call its Jingle handler with it""" |
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238 try: |
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239 ice_transport_elt = next( |
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240 transport_elt.elements(self._ice_udp.namespace, "transport") |
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241 ) |
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242 except StopIteration: |
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243 raise exceptions.DataError("Missing ICE UDP <transport> element.") |
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244 else: |
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245 await self._ice_udp.jingle_handler( |
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246 client, action, session, content_name, ice_transport_elt |
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247 ) |
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248 |
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249 async def jingle_handler( |
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250 self, |
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251 client: SatXMPPEntity, |
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252 action: str, |
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253 session: dict, |
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254 content_name: str, |
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255 transport_elt: domish.Element, |
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256 ) -> domish.Element: |
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257 """Handle Jingle requests |
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258 |
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259 @param client: The SatXMPPEntity instance. |
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260 @param action: The action to be performed with the session. |
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261 @param session: A dictionary containing the session information. |
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262 @param content_name: The name of the content. |
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263 @param transport_elt: The domish.Element instance representing the transport |
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264 element. |
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265 |
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266 @return: <transport> element |
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267 """ |
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268 content_data = session["contents"][content_name] |
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269 transport_data = content_data["transport_data"] |
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270 if action in (self._j.A_PREPARE_CONFIRMATION, self._j.A_PREPARE_INITIATOR): |
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271 session.setdefault("metadata", {}) |
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272 session.setdefault("peer_metadata", {}) |
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273 # we have to set application data despite being a transport handler, |
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274 # because the SDP generation needs application data |
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275 application_data = content_data["application_data"] |
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276 application_data.setdefault("peer_data", {}) |
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277 application_data.setdefault("media", "application") |
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278 |
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279 if action == self._j.A_PREPARE_CONFIRMATION: |
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280 await self._call_ice_udp_handler( |
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281 client, action, session, content_name, transport_elt |
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282 ) |
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283 try: |
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284 transport_data["sctp-port"] = int(transport_elt["sctp-port"]) |
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285 transport_data["max-message-size"] = int( |
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286 transport_elt.getAttribute("max-message-size", 65536) |
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287 ) |
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288 except (KeyError, ValueError): |
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289 raise exceptions.DataError( |
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290 f"Invalid datachannel signaling element: {transport_elt.toXml()}" |
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291 ) |
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292 transport_data["webrtc"] = True |
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293 elif action in ( |
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294 self._j.A_PREPARE_CONFIRMATION, self._j.A_PREPARE_INITIATOR, |
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295 self._j.A_TRANSPORT_INFO |
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296 ): |
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297 await self._call_ice_udp_handler( |
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298 client, action, session, content_name, transport_elt |
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299 ) |
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300 elif action == self._j.A_SESSION_ACCEPT: |
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301 await self._call_ice_udp_handler( |
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302 client, action, session, content_name, transport_elt |
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303 ) |
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304 answer_sdp = mapping.generate_sdp_from_session(session) |
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305 self.host.bridge.call_setup( |
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306 session["id"], |
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307 data_format.serialise( |
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308 { |
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309 "role": session["role"], |
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310 "sdp": answer_sdp, |
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311 } |
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312 ), |
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313 client.profile, |
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314 ) |
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315 elif action in (self._j.A_ACCEPTED_ACK, self._j.A_PREPARE_RESPONDER): |
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316 pass |
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317 elif action == self._j.A_START: |
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318 pass |
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319 elif action == self._j.A_SESSION_INITIATE: |
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320 # responder side |
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321 |
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322 sdp = mapping.generate_sdp_from_session(session) |
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323 session["answer_sdp_d"] = answer_sdp_d = defer.Deferred() |
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324 # we should have the answer long before 2 min |
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325 answer_sdp_d.addTimeout(2 * 60, reactor) |
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326 |
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327 self.host.bridge.call_setup( |
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328 session["id"], |
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329 data_format.serialise( |
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330 { |
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331 "role": session["role"], |
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332 "sdp": sdp, |
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333 } |
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334 ), |
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335 client.profile, |
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336 ) |
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337 |
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338 answer_sdp = await answer_sdp_d |
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339 parsed_answer = mapping.parse_sdp(answer_sdp) |
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340 session["metadata"].update(parsed_answer["metadata"]) |
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341 contents = session["contents"] |
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342 if len(contents) != 1: |
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343 raise NotImplementedError( |
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344 "Only a singlecontent is supported at the moment." |
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345 ) |
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346 content = next(iter(contents.values())) |
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347 media_data = parsed_answer["application"] |
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348 application_data = content["application_data"] |
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349 application_data["local_data"] = media_data["application_data"] |
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350 transport_data = content["transport_data"] |
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351 local_ice_data = media_data["transport_data"] |
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352 transport_data["local_ice_data"] = local_ice_data |
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353 transport_elt.children.clear() |
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354 ice_transport_elt = await self._ice_udp.jingle_handler( |
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355 client, action, session, content_name, transport_elt |
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356 ) |
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357 transport_elt.addChild(ice_transport_elt) |
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358 elif action == self._j.A_DESTROY: |
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359 # the transport is replaced (fallback ?) |
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360 pass |
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361 else: |
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362 log.warning(f"FIXME: unmanaged action {action}") |
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363 |
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364 return transport_elt |
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365 |
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366 |
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367 @implementer(iwokkel.IDisco) |
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368 class XEP0343Handler(XMPPHandler): |
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369 def getDiscoInfo(self, requestor, target, nodeIdentifier=""): |
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370 return [disco.DiscoFeature(NS_JINGLE_WEBRTC_DATACHANNELS)] |
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371 |
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372 def getDiscoItems(self, requestor, target, nodeIdentifier=""): |
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373 return [] |