Mercurial > libervia-backend

annotate libervia/backend/plugins/plugin_xep_0338.py @ 4122:52a89ddf3087

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plugin XEP-0338: be sure to add the `<group>` element only once: rel 424
author Goffi <goffi@goffi.org>
date Tue, 03 Oct 2023 15:27:07 +0200
parents 4b842c1fb686
children c8b19a32f5c0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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08ee0e623e7e plugin XEP-0338: "Jingle Grouping Framework" implementation:
Goffi <goffi@goffi.org>
parents:
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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,
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123 media: str,
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124 media_data: dict,
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125 desc_elt: domish.Element,
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126 ) -> None:
4122
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127 if content_name == next(iter(session["contents"])):
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128 # the <group> element must be added only once, so we do it only for the first
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129 # content
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130 jingle_elt = session["jingle_elt"]
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131 self.add_group_element(jingle_elt, session)
4064
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132
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133 def _jingle_handler_trigger(
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134 self,
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135 client: SatXMPPEntity,
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136 action: str,
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137 session: dict,
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138 content_name: str,
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Goffi <goffi@goffi.org>
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139 desc_elt: domish.Element,
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Goffi <goffi@goffi.org>
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140 ) -> None:
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141 # this is a session metadata, so we only generate it on the first content
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142 if content_name == next(iter(session["contents"])) and action in (
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143 self._j.A_PREPARE_CONFIRMATION,
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144 self._j.A_SESSION_INITIATE,
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145 self._j.A_PREPARE_INITIATOR,
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146 ):
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147 jingle_elt = session["jingle_elt"]
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148 self.parse_group_element(jingle_elt, session)
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149 if action == self._j.A_SESSION_INITIATE:
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150 self.add_group_element(jingle_elt, session)
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151
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152
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153 @implementer(iwokkel.IDisco)
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154 class XEP_0338_handler(XMPPHandler):
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155 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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156 return [disco.DiscoFeature(NS_RFC_5888)]
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157
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158 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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159 return []