view sat/plugins/plugin_xep_0261.py @ 4002:5245b675f7ad

plugin XEP-0313: don't wait for MAM to be retrieved in connection workflow: MAM retrieval can be long, and can be done after connection, message just need to be sorted when being inserted (i.e. frontends must do insort). To avoid blocking connection for too long and result in bad UX and timeout risk, one2one MAM message are not retrieved in background.
author Goffi <goffi@goffi.org>
date Fri, 10 Mar 2023 17:22:45 +0100
parents be6d91572633
children 524856bd7b19
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#!/usr/bin/env python3


# SAT plugin for Jingle (XEP-0261)
# Copyright (C) 2009-2021 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 sat.core.i18n import _
from sat.core.constants import Const as C
from sat.core.log import getLogger

log = getLogger(__name__)
from wokkel import disco, iwokkel
from zope.interface import implementer
from twisted.words.xish import domish
import uuid

try:
    from twisted.words.protocols.xmlstream import XMPPHandler
except ImportError:
    from wokkel.subprotocols import XMPPHandler


NS_JINGLE_IBB = "urn:xmpp:jingle:transports:ibb:1"

PLUGIN_INFO = {
    C.PI_NAME: "Jingle In-Band Bytestreams",
    C.PI_IMPORT_NAME: "XEP-0261",
    C.PI_TYPE: "XEP",
    C.PI_MODES: C.PLUG_MODE_BOTH,
    C.PI_PROTOCOLS: ["XEP-0261"],
    C.PI_DEPENDENCIES: ["XEP-0166", "XEP-0047"],
    C.PI_MAIN: "XEP_0261",
    C.PI_HANDLER: "yes",
    C.PI_DESCRIPTION: _("""Implementation of Jingle In-Band Bytestreams"""),
}


class XEP_0261(object):
    NAMESPACE = NS_JINGLE_IBB  # used by XEP-0260 plugin for transport-replace

    def __init__(self, host):
        log.info(_("plugin Jingle In-Band Bytestreams"))
        self.host = host
        self._j = host.plugins["XEP-0166"]  # shortcut to access jingle
        self._ibb = host.plugins["XEP-0047"]  # and in-band bytestream
        self._j.registerTransport(
            NS_JINGLE_IBB, self._j.TRANSPORT_STREAMING, self, -10000
        )  # must be the lowest priority

    def getHandler(self, client):
        return XEP_0261_handler()

    def jingleSessionInit(self, client, session, content_name):
        transport_elt = domish.Element((NS_JINGLE_IBB, "transport"))
        content_data = session["contents"][content_name]
        transport_data = content_data["transport_data"]
        transport_data["block_size"] = self._ibb.BLOCK_SIZE
        transport_elt["block-size"] = str(transport_data["block_size"])
        transport_elt["sid"] = transport_data["sid"] = str(uuid.uuid4())
        return transport_elt

    def jingleHandler(self, client, action, session, content_name, transport_elt):
        content_data = session["contents"][content_name]
        transport_data = content_data["transport_data"]
        if action in (
            self._j.A_SESSION_ACCEPT,
            self._j.A_ACCEPTED_ACK,
            self._j.A_TRANSPORT_ACCEPT,
        ):
            pass
        elif action in (self._j.A_SESSION_INITIATE, self._j.A_TRANSPORT_REPLACE):
            transport_data["sid"] = transport_elt["sid"]
        elif action in (self._j.A_START, self._j.A_PREPARE_RESPONDER):
            local_jid = session["local_jid"]
            peer_jid = session["peer_jid"]
            sid = transport_data["sid"]
            stream_object = content_data["stream_object"]
            if action == self._j.A_START:
                block_size = transport_data["block_size"]
                d = self._ibb.startStream(
                    client, stream_object, local_jid, peer_jid, sid, block_size
                )
                d.chainDeferred(content_data["finished_d"])
            else:
                d = self._ibb.createSession(
                    client, stream_object, local_jid, peer_jid, sid)
                d.chainDeferred(content_data["finished_d"])
        else:
            log.warning("FIXME: unmanaged action {}".format(action))
        return transport_elt


@implementer(iwokkel.IDisco)
class XEP_0261_handler(XMPPHandler):

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

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