view libervia/backend/plugins/plugin_xep_0428.py @ 4240:79c8a70e1813

backend, frontend: prepare remote control: This is a series of changes necessary to prepare the implementation of remote control feature: - XEP-0166: add a `priority` attribute to `ApplicationData`: this is needed when several applications are working in a same session, to know which one must be handled first. Will be used to make Remote Control have precedence over Call content. - XEP-0166: `_call_plugins` is now async and is not used with `DeferredList` anymore: the benefit to have methods called in parallels is very low, and it cause a lot of trouble as we can't predict order. Methods are now called sequentially so workflow can be predicted. - XEP-0167: fix `senders` XMPP attribute <=> SDP mapping - XEP-0234: preflight acceptance key is now `pre-accepted` instead of `file-accepted`, so the same key can be used with other jingle applications. - XEP-0167, XEP-0343: move some method to XEP-0167 - XEP-0353: use new `priority` feature to call preflight methods of applications according to it. - frontend (webrtc): refactor the sources/sink handling with a more flexible mechanism based on Pydantic models. It is now possible to have has many Data Channel as necessary, to have them in addition to A/V streams, to specify manually GStreamer sources and sinks, etc. - frontend (webrtc): rework of the pipeline to reduce latency. - frontend: new `portal_desktop` method. Screenshare portal handling has been moved there, and RemoteDesktop portal has been added. - frontend (webrtc): fix `extract_ufrag_pwd` method. rel 436
author Goffi <goffi@goffi.org>
date Sat, 11 May 2024 13:52:41 +0200
parents a1f7040b5a15
children 0d7bb4df2343
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#!/usr/bin/env python3

# Copyright (C) 2009-2022 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 Optional

from twisted.words.protocols.jabber import xmlstream
from twisted.words.xish import domish
from wokkel import disco
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

log = getLogger(__name__)


PLUGIN_INFO = {
    C.PI_NAME: "Fallback Indication",
    C.PI_IMPORT_NAME: "XEP-0428",
    C.PI_TYPE: "XEP",
    C.PI_MODES: C.PLUG_MODE_BOTH,
    C.PI_PROTOCOLS: ["XEP-0428"],
    C.PI_MAIN: "XEP_0428",
    C.PI_HANDLER: "yes",
    C.PI_DESCRIPTION: _("""Implementation of XEP-0428 (Fallback Indication)"""),
}

NS_FALLBACK = "urn:xmpp:fallback:0"


class XEP_0428(object):

    def __init__(self, host):
        log.info(_("XEP-0428 (Fallback Indication) plugin initialization"))
        host.register_namespace("fallback", NS_FALLBACK)

    def add_fallback_elt(
        self,
        message_elt: domish.Element,
        msg: Optional[str] = None
    ) -> None:
        """Add the fallback indication element

        @param message_elt: <message> element where the indication must be
            set
        @param msg: message to show as fallback
            Will be added as <body>
        """
        message_elt.addElement((NS_FALLBACK, "fallback"))
        if msg is not None:
            message_elt.addElement("body", content=msg)

    def has_fallback(self, message_elt: domish.Element) -> bool:
        """Tell if a message has a fallback indication"""
        try:
            next(message_elt.elements(NS_FALLBACK, "fallback"))
        except StopIteration:
            return False
        else:
            return True

    def get_handler(self, __):
        return XEP_0428_handler()


@implementer(disco.IDisco)
class XEP_0428_handler(xmlstream.XMPPHandler):

    def getDiscoInfo(self, __, target, nodeIdentifier=""):
        return [disco.DiscoFeature(NS_FALLBACK)]

    def getDiscoItems(self, requestor, target, nodeIdentifier=""):
        return []