view sat/plugins/plugin_xep_0261.py @ 3405:ecdb3728749e

plugin XEP-0353: Jingle Message Initiation implementation: This plugin uses the new `XEP-0166_initiate` trigger to initiate a Jingle session with messages if the peer jid has no resource specified. On reception, if the sender is not in our roster, a confirmation is requested to user to avoid leaking presence and IP. If user refuses the session for somebody not in roster, nothing is sent at all (the request is just ignored).
author Goffi <goffi@goffi.org>
date Thu, 12 Nov 2020 14:53:15 +0100
parents 559a625a236b
children be6d91572633
line wrap: on
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#!/usr/bin/env python3


# SAT plugin for Jingle (XEP-0261)
# Copyright (C) 2009-2020 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 []