Mercurial > libervia-backend

annotate libervia/backend/plugins/plugin_xep_0338.py @ 4118:07370d2a9bde

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plugin XEP-0167: keep media order when starting a call: media content order is relevant when building Jingle contents/SDP notably for bundling. This patch fixes the previous behaviour of always using the same order by keeping the order of the data (i.e. order of original SDP offer). Previous behaviour could lead to call failure. rel 424
author Goffi <goffi@goffi.org>
date Tue, 03 Oct 2023 15:15:24 +0200
parents 4b842c1fb686
children 52a89ddf3087
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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) 2009-2023 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 List
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20
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21 from twisted.words.protocols.jabber.xmlstream import XMPPHandler
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22 from twisted.words.xish import domish
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23 from wokkel import disco, iwokkel
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24 from zope.interface import implementer
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25
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26 from libervia.backend.core.constants import Const as C
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27 from libervia.backend.core.i18n import _
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28 from libervia.backend.core.log import getLogger
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29 from libervia.backend.core.core_types import SatXMPPEntity
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30
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31 log = getLogger(__name__)
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32
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33 NS_JINGLE_GROUPING = "urn:xmpp:jingle:apps:grouping:0"
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34 NS_RFC_5888 = "urn:ietf:rfc:5888"
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35
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36 PLUGIN_INFO = {
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37 C.PI_NAME: "Jingle Grouping Framework",
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38 C.PI_IMPORT_NAME: "XEP-0338",
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39 C.PI_TYPE: "XEP",
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40 C.PI_MODES: C.PLUG_MODE_BOTH,
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41 C.PI_PROTOCOLS: ["XEP-0338"],
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42 C.PI_DEPENDENCIES: ["XEP-0166", "XEP-0167"],
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43 C.PI_RECOMMENDATIONS: [],
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44 C.PI_MAIN: "XEP_0338",
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45 C.PI_HANDLER: "yes",
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46 C.PI_DESCRIPTION: _("""Jingle mapping of RFC 5888 SDP Grouping Framework"""),
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47 }
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48
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49
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50 class XEP_0338:
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51 def __init__(self, host):
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52 log.info(f"plugin {PLUGIN_INFO[C.PI_NAME]!r} initialization")
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53 self._j = host.plugins["XEP-0166"]
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54 host.trigger.add("XEP-0167_parse_sdp_a", self._parse_sdp_a_trigger)
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55 host.trigger.add(
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56 "XEP-0167_generate_sdp_session", self._generate_sdp_session_trigger
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57 )
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58 host.trigger.add("XEP-0167_jingle_session_init", self._jingle_session_init_trigger)
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59 host.trigger.add("XEP-0167_jingle_handler", self._jingle_handler_trigger)
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60
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61 def get_handler(self, client):
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62 return XEP_0338_handler()
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63
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64 def _parse_sdp_a_trigger(
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65 self,
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66 attribute: str,
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67 parts: List[str],
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68 call_data: dict,
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69 metadata: dict,
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70 media_type: str,
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71 application_data: dict,
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72 transport_data: dict,
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73 ) -> None:
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74 """Parse "group" attributes"""
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75 if attribute == "group":
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76 semantics = parts[0]
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77 content_names = parts[1:]
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78 metadata.setdefault("group", {})[semantics] = content_names
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79
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80 def _generate_sdp_session_trigger(
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81 self,
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82 session: dict,
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83 local: bool,
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84 sdp_lines: List[str],
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85 ) -> None:
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86 """Generate "group" attributes"""
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87 key = "metadata" if local else "peer_metadata"
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88 group_data = session[key].get("group", {})
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89
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90 for semantics, content_names in group_data.items():
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91 sdp_lines.append(f"a=group:{semantics} {' '.join(content_names)}")
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92
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93 def parse_group_element(
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94 self, jingle_elt: domish.Element, session: dict
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95 ) -> None:
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96 """Parse the <group> and <content> elements"""
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97 for group_elt in jingle_elt.elements(NS_JINGLE_GROUPING, "group"):
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98 try:
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99 metadata = session["peer_metadata"]
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100 semantics = group_elt["semantics"]
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101 group_content = metadata.setdefault("group", {})[semantics] = []
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102 for content_elt in group_elt.elements(NS_JINGLE_GROUPING, "content"):
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103 group_content.append(content_elt["name"])
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104 except KeyError as e:
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105 log.warning(f"Error while parsing <group>: {e}\n{group_elt.toXml()}")
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106
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107 def add_group_element(
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108 self, jingle_elt: domish.Element, session: dict
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109 ) -> None:
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110 """Build the <group> and <content> elements if possible"""
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111 for semantics, content_names in session["metadata"].get("group", {}).items():
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112 group_elt = jingle_elt.addElement((NS_JINGLE_GROUPING, "group"))
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113 group_elt["semantics"] = semantics
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114 for content_name in content_names:
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115 content_elt = group_elt.addElement((NS_JINGLE_GROUPING, "content"))
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116 content_elt["name"] = content_name
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117
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118 def _jingle_session_init_trigger(
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119 self,
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120 client: SatXMPPEntity,
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121 session: dict,
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122 content_name: str,
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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123 media: str,
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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124 media_data: dict,
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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125 desc_elt: domish.Element,
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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126 ) -> None:
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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127 jingle_elt = session["jingle_elt"]
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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128 self.add_group_element(jingle_elt, session)
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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129
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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130 def _jingle_handler_trigger(
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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131 self,
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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132 client: SatXMPPEntity,
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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133 action: str,
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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134 session: dict,
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
135 content_name: str,
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
136 desc_elt: domish.Element,
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
137 ) -> None:
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
138 # this is a session metadata, so we only generate it on the first content
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
139 if content_name == next(iter(session["contents"])) and action in (
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
140 self._j.A_PREPARE_CONFIRMATION,
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
141 self._j.A_SESSION_INITIATE,
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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142 self._j.A_PREPARE_INITIATOR,
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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143 ):
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
144 jingle_elt = session["jingle_elt"]
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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145 self.parse_group_element(jingle_elt, session)
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
146 if action == self._j.A_SESSION_INITIATE:
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
147 self.add_group_element(jingle_elt, session)
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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148
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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149
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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150 @implementer(iwokkel.IDisco)
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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151 class XEP_0338_handler(XMPPHandler):
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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152 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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153 return [disco.DiscoFeature(NS_RFC_5888)]
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
154
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
155 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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156 return []