view libervia/backend/plugins/plugin_xep_0280.py @ 4094:c3b68fdc2de7

component AP gateway: fix handling of XMPP comments authors: the gateway was supposing that comments where emitted from PEP of author. While this is the case for most blog posts, it's not for comments. Instead the component is now using `author_jid` which is retrieved by XEP-0277 plugin, and reject the item if the auhor is not verified (i.e. if `publisher` attribute is not set by XMPP service).
author Goffi <goffi@goffi.org>
date Mon, 12 Jun 2023 14:50:43 +0200
parents 4b842c1fb686
children 9162d3480b9e
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#!/usr/bin/env python3


# SAT plugin for managing xep-0280
# 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 libervia.backend.core.i18n import _, D_
from libervia.backend.core.log import getLogger

log = getLogger(__name__)
from libervia.backend.core import exceptions
from libervia.backend.core.constants import Const as C
from twisted.words.protocols.jabber.error import StanzaError
from twisted.internet import defer
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


PARAM_CATEGORY = "Misc"
PARAM_NAME = "carbon"
PARAM_LABEL = D_("Message carbons")
NS_CARBONS = "urn:xmpp:carbons:2"

PLUGIN_INFO = {
    C.PI_NAME: "XEP-0280 Plugin",
    C.PI_IMPORT_NAME: "XEP-0280",
    C.PI_TYPE: "XEP",
    C.PI_PROTOCOLS: ["XEP-0280"],
    C.PI_DEPENDENCIES: [],
    C.PI_MAIN: "XEP_0280",
    C.PI_HANDLER: "yes",
    C.PI_DESCRIPTION: D_("""Implementation of Message Carbons"""),
}


class XEP_0280(object):
    #  TODO: param is only checked at profile connection
    #       activate carbons on param change even after profile connection
    # TODO: chat state notifications are not handled yet (and potentially other XEPs?)

    params = """
    <params>
    <individual>
    <category name="{category_name}" label="{category_label}">
        <param name="{param_name}" label="{param_label}" value="true" type="bool" security="0" />
     </category>
    </individual>
    </params>
    """.format(
        category_name=PARAM_CATEGORY,
        category_label=D_(PARAM_CATEGORY),
        param_name=PARAM_NAME,
        param_label=PARAM_LABEL,
    )

    def __init__(self, host):
        log.info(_("Plugin XEP_0280 initialization"))
        self.host = host
        host.memory.update_params(self.params)
        host.trigger.add("message_received", self.message_received_trigger, priority=200000)

    def get_handler(self, client):
        return XEP_0280_handler()

    def set_private(self, message_elt):
        """Add a <private/> element to a message

        this method is intented to be called on final domish.Element by other plugins
        (in particular end 2 end encryption plugins)
        @param message_elt(domish.Element): <message> stanza
        """
        if message_elt.name != "message":
            log.error("addPrivateElt must be used with <message> stanzas")
            return
        message_elt.addElement((NS_CARBONS, "private"))

    @defer.inlineCallbacks
    def profile_connected(self, client):
        """activate message carbons on connection if possible and activated in config"""
        activate = self.host.memory.param_get_a(
            PARAM_NAME, PARAM_CATEGORY, profile_key=client.profile
        )
        if not activate:
            log.info(_("Not activating message carbons as requested in params"))
            return
        try:
            yield self.host.check_features(client, (NS_CARBONS,))
        except exceptions.FeatureNotFound:
            log.warning(_("server doesn't handle message carbons"))
        else:
            log.info(_("message carbons available, enabling it"))
            iq_elt = client.IQ()
            iq_elt.addElement((NS_CARBONS, "enable"))
            try:
                yield iq_elt.send()
            except StanzaError as e:
                log.warning("Can't activate message carbons: {}".format(e))
            else:
                log.info(_("message carbons activated"))

    def message_received_trigger(self, client, message_elt, post_treat):
        """get message and handle it if carbons namespace is present"""
        carbons_elt = None
        for e in message_elt.elements():
            if e.uri == NS_CARBONS:
                carbons_elt = e
                break

        if carbons_elt is None:
            # this is not a message carbons,
            # we continue normal behaviour
            return True

        if message_elt["from"] != client.jid.userhost():
            log.warning(
                "The message carbon received is not from our server, hack attempt?\n{xml}".format(
                    xml=message_elt.toXml()
                )
            )
            return
        forwarded_elt = next(carbons_elt.elements(C.NS_FORWARD, "forwarded"))
        cc_message_elt = next(forwarded_elt.elements(C.NS_CLIENT, "message"))

        # we replace the wrapping message with the CCed one
        # and continue the normal behaviour
        if carbons_elt.name == "received":
            message_elt["from"] = cc_message_elt["from"]
        elif carbons_elt.name == "sent":
            try:
                message_elt["to"] = cc_message_elt["to"]
            except KeyError:
                # we may not have "to" in case of message from ourself (from an other
                # device)
                pass
        else:
            log.warning(
                "invalid message carbons received:\n{xml}".format(
                    xml=message_elt.toXml()
                )
            )
            return False

        del message_elt.children[:]
        for c in cc_message_elt.children:
            message_elt.addChild(c)

        return True

@implementer(iwokkel.IDisco)
class XEP_0280_handler(XMPPHandler):

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

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