Mercurial > libervia-backend
view libervia/backend/plugins/plugin_xep_0338.py @ 4306:94e0968987cd
plugin XEP-0033: code modernisation, improve delivery, data validation:
- Code has been rewritten using Pydantic models and `async` coroutines for data validation
and cleaner element parsing/generation.
- Delivery has been completely rewritten. It now works even if server doesn't support
multicast, and send to local multicast service first. Delivering to local multicast
service first is due to bad support of XEP-0033 in server (notably Prosody which has an
incomplete implementation), and the current impossibility to detect if a sub-domain
service handles fully multicast or only for local domains. This is a workaround to have
a good balance between backward compatilibity and use of bandwith, and to make it work
with the incoming email gateway implementation (the gateway will only deliver to
entities of its own domain).
- disco feature checking now uses `async` corountines. `host` implementation still use
Deferred return values for compatibility with legacy code.
rel 450
author | Goffi <goffi@goffi.org> |
---|---|
date | Thu, 26 Sep 2024 16:12:01 +0200 |
parents | b4b4ea8c5c87 |
children |
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#!/usr/bin/env python3 # Libervia plugin # Copyright (C) 2009-2023 Jérôme Poisson (goffi@goffi.org) # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU Affero General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU Affero General Public License for more details. # You should have received a copy of the GNU Affero General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. from typing import List from twisted.words.protocols.jabber.xmlstream import XMPPHandler from twisted.words.xish import domish from wokkel import disco, iwokkel from zope.interface import implementer from libervia.backend.core.constants import Const as C from libervia.backend.core.i18n import _ from libervia.backend.core.log import getLogger from libervia.backend.core.core_types import SatXMPPEntity log = getLogger(__name__) NS_JINGLE_GROUPING = "urn:xmpp:jingle:apps:grouping:0" NS_RFC_5888 = "urn:ietf:rfc:5888" PLUGIN_INFO = { C.PI_NAME: "Jingle Grouping Framework", C.PI_IMPORT_NAME: "XEP-0338", C.PI_TYPE: "XEP", C.PI_MODES: C.PLUG_MODE_BOTH, C.PI_PROTOCOLS: ["XEP-0338"], C.PI_DEPENDENCIES: ["XEP-0166", "XEP-0167"], C.PI_RECOMMENDATIONS: [], C.PI_MAIN: "XEP_0338", C.PI_HANDLER: "yes", C.PI_DESCRIPTION: _("""Jingle mapping of RFC 5888 SDP Grouping Framework"""), } class XEP_0338: def __init__(self, host): log.info(f"plugin {PLUGIN_INFO[C.PI_NAME]!r} initialization") self._j = host.plugins["XEP-0166"] host.trigger.add("XEP-0167_parse_sdp_a", self._parse_sdp_a_trigger) host.trigger.add( "XEP-0167_generate_sdp_session", self._generate_sdp_session_trigger ) host.trigger.add( "XEP-0167_jingle_session_init", self._jingle_session_init_trigger ) host.trigger.add("XEP-0167_jingle_handler", self._jingle_handler_trigger) def get_handler(self, client): return XEP_0338_handler() def _parse_sdp_a_trigger( self, attribute: str, parts: List[str], call_data: dict, metadata: dict, media_type: str, application_data: dict, transport_data: dict, ) -> None: """Parse "group" attributes""" if attribute == "group": semantics = parts[0] content_names = parts[1:] metadata.setdefault("group", {})[semantics] = content_names def _generate_sdp_session_trigger( self, session: dict, local: bool, sdp_lines: List[str], ) -> None: """Generate "group" attributes""" key = "metadata" if local else "peer_metadata" group_data = session[key].get("group", {}) for semantics, content_names in group_data.items(): sdp_lines.append(f"a=group:{semantics} {' '.join(content_names)}") def parse_group_element(self, jingle_elt: domish.Element, session: dict) -> None: """Parse the <group> and <content> elements""" for group_elt in jingle_elt.elements(NS_JINGLE_GROUPING, "group"): try: metadata = session["peer_metadata"] semantics = group_elt["semantics"] group_content = metadata.setdefault("group", {})[semantics] = [] for content_elt in group_elt.elements(NS_JINGLE_GROUPING, "content"): group_content.append(content_elt["name"]) except KeyError as e: log.warning(f"Error while parsing <group>: {e}\n{group_elt.toXml()}") def add_group_element(self, jingle_elt: domish.Element, session: dict) -> None: """Build the <group> and <content> elements if possible""" for semantics, content_names in session["metadata"].get("group", {}).items(): # always add the <group> element as first child of <jingle> element to work # around https://github.com/movim/movim/issues/1233 group_elt = domish.Element((NS_JINGLE_GROUPING, "group")) jingle_elt.children.insert(0, group_elt) group_elt["semantics"] = semantics for content_name in content_names: content_elt = group_elt.addElement((NS_JINGLE_GROUPING, "content")) content_elt["name"] = content_name def _jingle_session_init_trigger( self, client: SatXMPPEntity, session: dict, content_name: str, media: str, media_data: dict, desc_elt: domish.Element, ) -> None: if content_name == next(iter(session["contents"])): # the <group> element must be added only once, so we do it only for the first # content jingle_elt = session["jingle_elt"] self.add_group_element(jingle_elt, session) async def _jingle_handler_trigger( self, client: SatXMPPEntity, action: str, session: dict, content_name: str, desc_elt: domish.Element, ) -> None: # this is a session metadata, so we only generate it on the first content if content_name == next(iter(session["contents"])) and action in ( self._j.A_PREPARE_CONFIRMATION, self._j.A_SESSION_INITIATE, self._j.A_PREPARE_INITIATOR, ): jingle_elt = session["jingle_elt"] self.parse_group_element(jingle_elt, session) if action == self._j.A_SESSION_INITIATE: self.add_group_element(jingle_elt, session) @implementer(iwokkel.IDisco) class XEP_0338_handler(XMPPHandler): def getDiscoInfo(self, requestor, target, nodeIdentifier=""): return [disco.DiscoFeature(NS_RFC_5888)] def getDiscoItems(self, requestor, target, nodeIdentifier=""): return []