view sat/plugins/plugin_xep_0184.py @ 3913:944f51f9c2b4

core (xmpp): make `send` a blocking method, fix `sendMessageData` calls: original `send` method is blocking, and it is used as such by Wokkel and thus can't be changed to an async method easily. However, an Async method is necessary to have an async trigger at the very end of the send workflow for end-to-end encryption. To workaround that, `send` is an async method which call `a_send`, an async method which actually does the sending. This way legacy method can still call `send` while `a_send` can be await otherwise. Fix calls to `sendMessageData`: the method now being an `async` one, `ensureDeferred` had to be used in some calls.
author Goffi <goffi@goffi.org>
date Sat, 24 Sep 2022 16:31:39 +0200
parents 31628770a15a
children 524856bd7b19
line wrap: on
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#!/usr/bin/env python3


# SAT plugin for managing xep-0184
# Copyright (C) 2009-2016 Geoffrey POUZET (chteufleur@kingpenguin.tk)

# 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
from twisted.internet import reactor
from twisted.words.protocols.jabber import xmlstream, jid
from twisted.words.xish import domish

log = getLogger(__name__)

from wokkel import disco, iwokkel
from zope.interface import implementer

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


NS_MESSAGE_DELIVERY_RECEIPTS = "urn:xmpp:receipts"

MSG = "message"

MSG_CHAT = "/" + MSG + '[@type="chat"]'
MSG_CHAT_MESSAGE_DELIVERY_RECEIPTS_REQUEST = (
    MSG_CHAT + '/request[@xmlns="' + NS_MESSAGE_DELIVERY_RECEIPTS + '"]'
)
MSG_CHAT_MESSAGE_DELIVERY_RECEIPTS_RECEIVED = (
    MSG_CHAT + '/received[@xmlns="' + NS_MESSAGE_DELIVERY_RECEIPTS + '"]'
)

MSG_NORMAL = "/" + MSG + '[@type="normal"]'
MSG_NORMAL_MESSAGE_DELIVERY_RECEIPTS_REQUEST = (
    MSG_NORMAL + '/request[@xmlns="' + NS_MESSAGE_DELIVERY_RECEIPTS + '"]'
)
MSG_NORMAL_MESSAGE_DELIVERY_RECEIPTS_RECEIVED = (
    MSG_NORMAL + '/received[@xmlns="' + NS_MESSAGE_DELIVERY_RECEIPTS + '"]'
)


PARAM_KEY = "Privacy"
PARAM_NAME = "Enable message delivery receipts"
ENTITY_KEY = PARAM_KEY + "_" + PARAM_NAME


PLUGIN_INFO = {
    C.PI_NAME: "XEP-0184 Plugin",
    C.PI_IMPORT_NAME: "XEP-0184",
    C.PI_TYPE: "XEP",
    C.PI_PROTOCOLS: ["XEP-0184"],
    C.PI_DEPENDENCIES: [],
    C.PI_MAIN: "XEP_0184",
    C.PI_HANDLER: "yes",
    C.PI_DESCRIPTION: _("""Implementation of Message Delivery Receipts"""),
}


STATUS_MESSAGE_DELIVERY_RECEIVED = "delivered"
TEMPO_DELETE_WAITING_ACK_S = 300  # 5 min


class XEP_0184(object):
    """
    Implementation for XEP 0184.
    """

    params = """
    <params>
    <individual>
    <category name="%(category_name)s" label="%(category_label)s">
        <param name="%(param_name)s" label="%(param_label)s" value="true" type="bool" security="0"/>
     </category>
    </individual>
    </params>
    """ % {
        "category_name": PARAM_KEY,
        "category_label": _(PARAM_KEY),
        "param_name": PARAM_NAME,
        "param_label": _("Enable message delivery receipts"),
    }

    def __init__(self, host):
        log.info(_("Plugin XEP_0184 (message delivery receipts) initialization"))
        self.host = host
        self._dictRequest = dict()

        # parameter value is retrieved before each use
        host.memory.updateParams(self.params)

        host.trigger.add("sendMessage", self.sendMessageTrigger)
        host.bridge.addSignal(
            "messageState", ".plugin", signature="sss"
        )  # message_uid, status, profile

    def getHandler(self, client):
        return XEP_0184_handler(self, client.profile)

    def sendMessageTrigger(
        self, client, mess_data, pre_xml_treatments, post_xml_treatments
    ):
        """Install SendMessage command hook """

        def treatment(mess_data):
            message = mess_data["xml"]
            message_type = message.getAttribute("type")

            if self._isActif(client.profile) and (
                message_type == "chat" or message_type == "normal"
            ):
                message.addElement("request", NS_MESSAGE_DELIVERY_RECEIPTS)
                uid = mess_data["uid"]
                msg_id = message.getAttribute("id")
                self._dictRequest[msg_id] = uid
                reactor.callLater(
                    TEMPO_DELETE_WAITING_ACK_S, self._clearDictRequest, msg_id
                )
                log.debug(
                    _(
                        "[XEP-0184] Request acknowledgment for message id {}".format(
                            msg_id
                        )
                    )
                )

            return mess_data

        post_xml_treatments.addCallback(treatment)
        return True

    def onMessageDeliveryReceiptsRequest(self, msg_elt, client):
        """This method is called on message delivery receipts **request** (XEP-0184 #7)
        @param msg_elt: message element
        @param client: %(doc_client)s"""
        from_jid = jid.JID(msg_elt["from"])

        if self._isActif(client.profile) and client.roster.isSubscribedFrom(from_jid):
            received_elt_ret = domish.Element((NS_MESSAGE_DELIVERY_RECEIPTS, "received"))
            try:
                received_elt_ret["id"] = msg_elt["id"]
            except KeyError:
                log.warning(f"missing id for message element: {msg_elt.toXml}")
                return

            msg_result_elt = xmlstream.toResponse(msg_elt, "result")
            msg_result_elt.addChild(received_elt_ret)
            client.send(msg_result_elt)

    def onMessageDeliveryReceiptsReceived(self, msg_elt, client):
        """This method is called on message delivery receipts **received** (XEP-0184 #7)
        @param msg_elt: message element
        @param client: %(doc_client)s"""
        msg_elt.handled = True
        rcv_elt = next(msg_elt.elements(NS_MESSAGE_DELIVERY_RECEIPTS, "received"))
        msg_id = rcv_elt["id"]

        try:
            uid = self._dictRequest[msg_id]
            del self._dictRequest[msg_id]
            self.host.bridge.messageState(
                uid, STATUS_MESSAGE_DELIVERY_RECEIVED, client.profile
            )
            log.debug(
                _("[XEP-0184] Receive acknowledgment for message id {}".format(msg_id))
            )
        except KeyError:
            pass

    def _clearDictRequest(self, msg_id):
        try:
            del self._dictRequest[msg_id]
            log.debug(
                _(
                    "[XEP-0184] Delete waiting acknowledgment for message id {}".format(
                        msg_id
                    )
                )
            )
        except KeyError:
            pass

    def _isActif(self, profile):
        return self.host.memory.getParamA(PARAM_NAME, PARAM_KEY, profile_key=profile)


@implementer(iwokkel.IDisco)
class XEP_0184_handler(XMPPHandler):

    def __init__(self, plugin_parent, profile):
        self.plugin_parent = plugin_parent
        self.host = plugin_parent.host
        self.profile = profile

    def connectionInitialized(self):
        self.xmlstream.addObserver(
            MSG_CHAT_MESSAGE_DELIVERY_RECEIPTS_REQUEST,
            self.plugin_parent.onMessageDeliveryReceiptsRequest,
            client=self.parent,
        )
        self.xmlstream.addObserver(
            MSG_CHAT_MESSAGE_DELIVERY_RECEIPTS_RECEIVED,
            self.plugin_parent.onMessageDeliveryReceiptsReceived,
            client=self.parent,
        )

        self.xmlstream.addObserver(
            MSG_NORMAL_MESSAGE_DELIVERY_RECEIPTS_REQUEST,
            self.plugin_parent.onMessageDeliveryReceiptsRequest,
            client=self.parent,
        )
        self.xmlstream.addObserver(
            MSG_NORMAL_MESSAGE_DELIVERY_RECEIPTS_RECEIVED,
            self.plugin_parent.onMessageDeliveryReceiptsReceived,
            client=self.parent,
        )

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

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