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annotate libervia/backend/plugins/plugin_xep_0339.py @ 4249:ba46d6a0ff3a

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doc: style/typos/URL fixes
author Goffi <goffi@goffi.org>
date Fri, 31 May 2024 11:08:20 +0200
parents 4b842c1fb686
children 0d7bb4df2343
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3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
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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 import exceptions
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27 from libervia.backend.core.constants import Const as C
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28 from libervia.backend.core.core_types import SatXMPPEntity
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29 from libervia.backend.core.i18n import _
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30 from libervia.backend.core.log import getLogger
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31 from libervia.backend.tools import xml_tools
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32
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33 log = getLogger(__name__)
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34
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35 NS_JINGLE_RTP_SSMA = "urn:xmpp:jingle:apps:rtp:ssma:0"
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36
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37 PLUGIN_INFO = {
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38 C.PI_NAME: "Source-Specific Media Attributes in Jingle",
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39 C.PI_IMPORT_NAME: "XEP-0339",
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40 C.PI_TYPE: "XEP",
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41 C.PI_MODES: C.PLUG_MODE_BOTH,
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42 C.PI_PROTOCOLS: ["XEP-0339"],
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43 C.PI_DEPENDENCIES: ["XEP-0092", "XEP-0167"],
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44 C.PI_RECOMMENDATIONS: [],
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45 C.PI_MAIN: "XEP_0339",
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46 C.PI_HANDLER: "yes",
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47 C.PI_DESCRIPTION: _("""Source-Specific Media Attributes in Jingle"""),
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48 }
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49
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
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50
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
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51 class XEP_0339:
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52 def __init__(self, host):
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53 log.info(f"plugin {PLUGIN_INFO[C.PI_NAME]!r} initialization")
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54 self.host = host
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55 host.trigger.add("XEP-0167_parse_sdp_a", self._parse_sdp_a_trigger)
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56 host.trigger.add(
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57 "XEP-0167_generate_sdp_content", self._generate_sdp_content_trigger
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58 )
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59 host.trigger.add("XEP-0167_parse_description", self._parse_description_trigger)
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60 host.trigger.add("XEP-0167_build_description", self._build_description_trigger)
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61
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62 def get_handler(self, client):
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63 return XEP_0339_handler()
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64
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65 def _parse_sdp_a_trigger(
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66 self,
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67 attribute: str,
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68 parts: List[str],
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69 call_data: dict,
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70 metadata: dict,
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71 media_type: str,
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72 application_data: dict,
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73 transport_data: dict,
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74 ) -> None:
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75 """Parse "ssrc" attributes"""
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76 if attribute == "ssrc":
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77 assert application_data is not None
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78 ssrc_id = int(parts[0])
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79
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80 if len(parts) > 1:
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81 name, *values = " ".join(parts[1:]).split(":", 1)
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82 if values:
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83 value = values[0] or None
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84 else:
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85 value = None
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86 application_data.setdefault("ssrc", {}).setdefault(ssrc_id, {})[
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87 name
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88 ] = value
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89 else:
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90 log.warning(f"no attribute in ssrc: {' '.join(parts)}")
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91 application_data.setdefault("ssrc", {}).setdefault(ssrc_id, {})
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92 elif attribute == "ssrc-group":
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93 assert application_data is not None
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94 semantics, *ssrc_ids = parts
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95 ssrc_ids = [int(ssrc_id) for ssrc_id in ssrc_ids]
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96 application_data.setdefault("ssrc-group", {})[semantics] = ssrc_ids
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97 elif attribute == "msid":
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98 assert application_data is not None
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99 application_data["msid"] = " ".join(parts)
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100
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101
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102 def _generate_sdp_content_trigger(
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103 self,
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104 session: dict,
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105 local: bool,
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106 idx: int,
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107 content_data: dict,
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108 sdp_lines: List[str],
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109 application_data: dict,
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110 app_data_key: str,
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111 media_data: dict,
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112 media: str
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113 ) -> None:
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114 """Generate "msid" and "ssrc" attributes"""
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115 if "msid" in media_data:
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116 sdp_lines.append(f"a=msid:{media_data['msid']}")
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117
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118 ssrc_data = media_data.get("ssrc", {})
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parents:
diff changeset
119 ssrc_group_data = media_data.get("ssrc-group", {})
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
120
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
121 for ssrc_id, attributes in ssrc_data.items():
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
122 if not attributes:
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
123 # there are no attributes for this SSRC ID, we add a simple line with only
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
124 # the SSRC ID
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
125 sdp_lines.append(f"a=ssrc:{ssrc_id}")
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
126 else:
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
127 for attr_name, attr_value in attributes.items():
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
128 if attr_value is not None:
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
129 sdp_lines.append(f"a=ssrc:{ssrc_id} {attr_name}:{attr_value}")
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
130 else:
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
131 sdp_lines.append(f"a=ssrc:{ssrc_id} {attr_name}")
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
132 for semantics, ssrc_ids in ssrc_group_data.items():
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
133 ssrc_lines = " ".join(str(ssrc_id) for ssrc_id in ssrc_ids)
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
134 sdp_lines.append(f"a=ssrc-group:{semantics} {ssrc_lines}")
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
135
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
136 def _parse_description_trigger(
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
137 self, desc_elt: domish.Element, media_data: dict
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
138 ) -> bool:
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
139 """Parse the <source> and <ssrc-group> elements"""
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
140 for source_elt in desc_elt.elements(NS_JINGLE_RTP_SSMA, "source"):
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
141 try:
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
142 ssrc_id = int(source_elt["ssrc"])
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
143 media_data.setdefault("ssrc", {})[ssrc_id] = {}
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
144 for param_elt in source_elt.elements(NS_JINGLE_RTP_SSMA, "parameter"):
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
145 name = param_elt["name"]
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
146 value = param_elt.getAttribute("value")
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
147 media_data["ssrc"][ssrc_id][name] = value
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
148 if name == "msid" and "msid" not in media_data:
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
149 media_data["msid"] = value
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
150 except (KeyError, ValueError) as e:
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
151 log.warning(f"Error while parsing <source>: {e}\n{source_elt.toXml()}")
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
152
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
153 for ssrc_group_elt in desc_elt.elements(NS_JINGLE_RTP_SSMA, "ssrc-group"):
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
154 try:
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
155 semantics = ssrc_group_elt["semantics"]
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
156 semantic_ids = media_data.setdefault("ssrc-group", {})[semantics] = []
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
157 for source_elt in ssrc_group_elt.elements(NS_JINGLE_RTP_SSMA, "source"):
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
158 semantic_ids.append(
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
159 int(source_elt["ssrc"])
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
160 )
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
161 except (KeyError, ValueError) as e:
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
162 log.warning(
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
163 f"Error while parsing <ssrc-group>: {e}\n{ssrc_group_elt.toXml()}"
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
164 )
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
165
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
166 return True
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
167
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
168 def _build_description_trigger(
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
169 self, desc_elt: domish.Element, media_data: dict, session: dict
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
170 ) -> bool:
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
171 """Build the <source> and <ssrc-group> elements if possible"""
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
172 for ssrc_id, parameters in media_data.get("ssrc", {}).items():
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
173 if "msid" not in parameters and "msid" in media_data:
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
174 parameters["msid"] = media_data["msid"]
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
175 source_elt = desc_elt.addElement((NS_JINGLE_RTP_SSMA, "source"))
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
176 source_elt["ssrc"] = str(ssrc_id)
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
177 for name, value in parameters.items():
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
178 param_elt = source_elt.addElement((NS_JINGLE_RTP_SSMA, "parameter"))
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
179 param_elt["name"] = name
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
180 if value is not None:
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
181 param_elt["value"] = value
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
182
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
183 for semantics, ssrc_ids in media_data.get("ssrc-group", {}).items():
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
184 ssrc_group_elt = desc_elt.addElement((NS_JINGLE_RTP_SSMA, "ssrc-group"))
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
185 ssrc_group_elt["semantics"] = semantics
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
186 for ssrc_id in ssrc_ids:
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
187 source_elt = ssrc_group_elt.addElement((NS_JINGLE_RTP_SSMA, "source"))
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
188 source_elt["ssrc"] = str(ssrc_id)
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
189
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
190 return True
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
191
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
192
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
193 @implementer(iwokkel.IDisco)
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
194 class XEP_0339_handler(XMPPHandler):
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
195 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
196 return [disco.DiscoFeature(NS_JINGLE_RTP_SSMA)]
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
197
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
198 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
3f62c2445df1 plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation:
Goffi <goffi@goffi.org>
parents:
diff changeset
199 return []