view libervia/backend/plugins/plugin_xep_0184.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 0d7bb4df2343
children
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 libervia.backend.core.i18n import _
from libervia.backend.core.constants import Const as C
from libervia.backend.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.update_params(self.params)

        host.trigger.add("sendMessage", self.send_message_trigger)
        host.bridge.add_signal(
            "message_state", ".plugin", signature="sss"
        )  # message_uid, status, profile

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

    def send_message_trigger(
        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._is_actif(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._clear_dict_request, 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 on_message_delivery_receipts_request(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._is_actif(client.profile) and client.roster.is_subscribed_from(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 on_message_delivery_receipts_received(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.message_state(
                uid, STATUS_MESSAGE_DELIVERY_RECEIVED, client.profile
            )
            log.debug(
                _("[XEP-0184] Receive acknowledgment for message id {}".format(msg_id))
            )
        except KeyError:
            pass

    def _clear_dict_request(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 _is_actif(self, profile):
        return self.host.memory.param_get_a(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.on_message_delivery_receipts_request,
            client=self.parent,
        )
        self.xmlstream.addObserver(
            MSG_CHAT_MESSAGE_DELIVERY_RECEIPTS_RECEIVED,
            self.plugin_parent.on_message_delivery_receipts_received,
            client=self.parent,
        )

        self.xmlstream.addObserver(
            MSG_NORMAL_MESSAGE_DELIVERY_RECEIPTS_REQUEST,
            self.plugin_parent.on_message_delivery_receipts_request,
            client=self.parent,
        )
        self.xmlstream.addObserver(
            MSG_NORMAL_MESSAGE_DELIVERY_RECEIPTS_RECEIVED,
            self.plugin_parent.on_message_delivery_receipts_received,
            client=self.parent,
        )

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

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