--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libervia/backend/plugins/plugin_xep_0045.py	Fri Jun 02 11:49:51 2023 +0200
@@ -0,0 +1,1483 @@
+#!/usr/bin/env python3
+
+
+# SAT plugin for managing xep-0045
+# 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/>.
+
+import time
+from typing import Optional
+import uuid
+
+from twisted.internet import defer
+from twisted.python import failure
+from twisted.words.protocols.jabber import jid
+from twisted.words.protocols.jabber import error as xmpp_error
+from wokkel import disco, iwokkel, muc
+from wokkel import rsm
+from wokkel import mam
+from zope.interface import implementer
+
+from libervia.backend.core import exceptions
+from libervia.backend.core.core_types import SatXMPPEntity
+from libervia.backend.core.constants import Const as C
+from libervia.backend.core.i18n import D_, _
+from libervia.backend.core.log import getLogger
+from libervia.backend.memory import memory
+from libervia.backend.tools import xml_tools, utils
+
+
+log = getLogger(__name__)
+
+
+PLUGIN_INFO = {
+    C.PI_NAME: "XEP-0045 Plugin",
+    C.PI_IMPORT_NAME: "XEP-0045",
+    C.PI_TYPE: "XEP",
+    C.PI_PROTOCOLS: ["XEP-0045"],
+    C.PI_DEPENDENCIES: ["XEP-0359"],
+    C.PI_RECOMMENDATIONS: [C.TEXT_CMDS, "XEP-0313"],
+    C.PI_MAIN: "XEP_0045",
+    C.PI_HANDLER: "yes",
+    C.PI_DESCRIPTION: _("""Implementation of Multi-User Chat""")
+}
+
+NS_MUC = 'http://jabber.org/protocol/muc'
+AFFILIATIONS = ('owner', 'admin', 'member', 'none', 'outcast')
+ROOM_USER_JOINED = 'ROOM_USER_JOINED'
+ROOM_USER_LEFT = 'ROOM_USER_LEFT'
+OCCUPANT_KEYS = ('nick', 'entity', 'affiliation', 'role')
+ROOM_STATE_OCCUPANTS = "occupants"
+ROOM_STATE_SELF_PRESENCE = "self-presence"
+ROOM_STATE_LIVE = "live"
+ROOM_STATES = (ROOM_STATE_OCCUPANTS, ROOM_STATE_SELF_PRESENCE, ROOM_STATE_LIVE)
+HISTORY_LEGACY = "legacy"
+HISTORY_MAM = "mam"
+
+
+CONFIG_SECTION = 'plugin muc'
+
+default_conf = {"default_muc": 'sat@chat.jabberfr.org'}
+
+
+class AlreadyJoined(exceptions.ConflictError):
+
+    def __init__(self, room):
+        super(AlreadyJoined, self).__init__()
+        self.room = room
+
+
+class XEP_0045(object):
+    # TODO: handle invitations
+    # FIXME: this plugin need a good cleaning, join method is messy
+
+    def __init__(self, host):
+        log.info(_("Plugin XEP_0045 initialization"))
+        self.host = host
+        self._sessions = memory.Sessions()
+        # return same arguments as muc_room_joined + a boolean set to True is the room was
+        # already joined (first argument)
+        host.bridge.add_method(
+            "muc_join", ".plugin", in_sign='ssa{ss}s', out_sign='(bsa{sa{ss}}ssass)',
+            method=self._join, async_=True)
+        host.bridge.add_method(
+            "muc_nick", ".plugin", in_sign='sss', out_sign='', method=self._nick)
+        host.bridge.add_method(
+            "muc_nick_get", ".plugin", in_sign='ss', out_sign='s', method=self._get_room_nick)
+        host.bridge.add_method(
+            "muc_leave", ".plugin", in_sign='ss', out_sign='', method=self._leave,
+            async_=True)
+        host.bridge.add_method(
+            "muc_occupants_get", ".plugin", in_sign='ss', out_sign='a{sa{ss}}',
+            method=self._get_room_occupants)
+        host.bridge.add_method(
+            "muc_subject", ".plugin", in_sign='sss', out_sign='', method=self._subject)
+        host.bridge.add_method(
+            "muc_get_rooms_joined", ".plugin", in_sign='s', out_sign='a(sa{sa{ss}}ssas)',
+            method=self._get_rooms_joined)
+        host.bridge.add_method(
+            "muc_get_unique_room_name", ".plugin", in_sign='ss', out_sign='s',
+            method=self._get_unique_name)
+        host.bridge.add_method(
+            "muc_configure_room", ".plugin", in_sign='ss', out_sign='s',
+            method=self._configure_room, async_=True)
+        host.bridge.add_method(
+            "muc_get_default_service", ".plugin", in_sign='', out_sign='s',
+            method=self.get_default_muc)
+        host.bridge.add_method(
+            "muc_get_service", ".plugin", in_sign='ss', out_sign='s',
+            method=self._get_muc_service, async_=True)
+        # called when a room will be joined but must be locked until join is received
+        # (room is prepared, history is getting retrieved)
+        # args: room_jid, profile
+        host.bridge.add_signal(
+            "muc_room_prepare_join", ".plugin", signature='ss')
+        # args: room_jid, occupants, user_nick, subject, profile
+        host.bridge.add_signal(
+            "muc_room_joined", ".plugin", signature='sa{sa{ss}}ssass')
+        # args: room_jid, profile
+        host.bridge.add_signal(
+            "muc_room_left", ".plugin", signature='ss')
+        # args: room_jid, old_nick, new_nick, profile
+        host.bridge.add_signal(
+            "muc_room_user_changed_nick", ".plugin", signature='ssss')
+        # args: room_jid, subject, profile
+        host.bridge.add_signal(
+            "muc_room_new_subject", ".plugin", signature='sss')
+        self.__submit_conf_id = host.register_callback(
+            self._submit_configuration, with_data=True)
+        self._room_join_id = host.register_callback(self._ui_room_join_cb, with_data=True)
+        host.import_menu(
+            (D_("MUC"), D_("configure")), self._configure_room_menu, security_limit=0,
+            help_string=D_("Configure Multi-User Chat room"), type_=C.MENU_ROOM)
+        try:
+            self.text_cmds = self.host.plugins[C.TEXT_CMDS]
+        except KeyError:
+            log.info(_("Text commands not available"))
+        else:
+            self.text_cmds.register_text_commands(self)
+            self.text_cmds.add_who_is_cb(self._whois, 100)
+
+        self._mam = self.host.plugins.get("XEP-0313")
+        self._si = self.host.plugins["XEP-0359"]
+
+        host.trigger.add("presence_available", self.presence_trigger)
+        host.trigger.add("presence_received", self.presence_received_trigger)
+        host.trigger.add("message_received", self.message_received_trigger, priority=1000000)
+        host.trigger.add("message_parse", self._message_parse_trigger)
+
+    async def profile_connected(self, client):
+        client.muc_service = await self.get_muc_service(client)
+
+    def _message_parse_trigger(self, client, message_elt, data):
+        """Add stanza-id from the room if present"""
+        if message_elt.getAttribute("type") != C.MESS_TYPE_GROUPCHAT:
+            return True
+
+        # stanza_id will not be filled by parse_message because the emitter
+        # is the room and not our server, so we have to parse it here
+        room_jid = data["from"].userhostJID()
+        stanza_id = self._si.get_stanza_id(message_elt, room_jid)
+        if stanza_id:
+            data["extra"]["stanza_id"] = stanza_id
+
+    def message_received_trigger(self, client, message_elt, post_treat):
+        if message_elt.getAttribute("type") == C.MESS_TYPE_GROUPCHAT:
+            if message_elt.subject or message_elt.delay:
+                return False
+            from_jid = jid.JID(message_elt['from'])
+            room_jid = from_jid.userhostJID()
+            if room_jid in client._muc_client.joined_rooms:
+                room = client._muc_client.joined_rooms[room_jid]
+                if room.state != ROOM_STATE_LIVE:
+                    if getattr(room, "_history_type", HISTORY_LEGACY) == HISTORY_LEGACY:
+                        # With MAM history, order is different, and we can get live
+                        # messages before history is complete, so this is not a warning
+                        # but an expected case.
+                        # On the other hand, with legacy history, it's not normal.
+                        log.warning(_(
+                            "Received non delayed message in a room before its "
+                            "initialisation: state={state}, msg={msg}").format(
+                        state=room.state,
+                        msg=message_elt.toXml()))
+                    room._cache.append(message_elt)
+                    return False
+            else:
+                log.warning("Received groupchat message for a room which has not been "
+                            "joined, ignoring it: {}".format(message_elt.toXml()))
+                return False
+        return True
+
+    def get_room(self, client: SatXMPPEntity, room_jid: jid.JID) -> muc.Room:
+        """Retrieve Room instance from its jid
+
+        @param room_jid: jid of the room
+        @raise exceptions.NotFound: the room has not been joined
+        """
+        try:
+            return client._muc_client.joined_rooms[room_jid]
+        except KeyError:
+            raise exceptions.NotFound(_("This room has not been joined"))
+
+    def check_room_joined(self, client, room_jid):
+        """Check that given room has been joined in current session
+
+        @param room_jid (JID): room JID
+        """
+        if room_jid not in client._muc_client.joined_rooms:
+            raise exceptions.NotFound(_("This room has not been joined"))
+
+    def is_joined_room(self, client: SatXMPPEntity, room_jid: jid.JID) -> bool:
+        """Tell if a jid is a known and joined room
+
+        @room_jid: jid of the room
+        """
+        try:
+            self.check_room_joined(client, room_jid)
+        except exceptions.NotFound:
+            return False
+        else:
+            return True
+
+    def is_room(self, client, entity_jid):
+        """Tell if a jid is a joined MUC
+
+        similar to is_joined_room but returns a boolean
+        @param entity_jid(jid.JID): full or bare jid of the entity check
+        @return (bool): True if the bare jid of the entity is a room jid
+        """
+        try:
+            self.check_room_joined(client, entity_jid.userhostJID())
+        except exceptions.NotFound:
+            return False
+        else:
+            return True
+
+    def get_bare_or_full(self, client, peer_jid):
+        """use full jid if peer_jid is an occupant of a room, bare jid else
+
+        @param peer_jid(jid.JID): entity to test
+        @return (jid.JID): bare or full jid
+        """
+        if peer_jid.resource:
+            if not self.is_room(client, peer_jid):
+                return peer_jid.userhostJID()
+        return peer_jid
+
+    def _get_room_joined_args(self, room, profile):
+        return [
+            room.roomJID.userhost(),
+            XEP_0045._get_occupants(room),
+            room.nick,
+            room.subject,
+            [s.name for s in room.statuses],
+            profile
+            ]
+
+    def _ui_room_join_cb(self, data, profile):
+        room_jid = jid.JID(data['index'])
+        client = self.host.get_client(profile)
+        self.join(client, room_jid)
+        return {}
+
+    def _password_ui_cb(self, data, client, room_jid, nick):
+        """Called when the user has given room password (or cancelled)"""
+        if C.bool(data.get(C.XMLUI_DATA_CANCELLED, "false")):
+            log.info("room join for {} is cancelled".format(room_jid.userhost()))
+            raise failure.Failure(exceptions.CancelError(D_("Room joining cancelled by user")))
+        password = data[xml_tools.form_escape('password')]
+        return client._muc_client.join(room_jid, nick, password).addCallbacks(self._join_cb, self._join_eb, (client, room_jid, nick), errbackArgs=(client, room_jid, nick, password))
+
+    def _show_list_ui(self, items, client, service):
+        xmlui = xml_tools.XMLUI(title=D_('Rooms in {}'.format(service.full())))
+        adv_list = xmlui.change_container('advanced_list', columns=1, selectable='single', callback_id=self._room_join_id)
+        items = sorted(items, key=lambda i: i.name.lower())
+        for item in items:
+            adv_list.set_row_index(item.entity.full())
+            xmlui.addText(item.name)
+        adv_list.end()
+        self.host.action_new({'xmlui': xmlui.toXml()}, profile=client.profile)
+
+    def _join_cb(self, room, client, room_jid, nick):
+        """Called when the user is in the requested room"""
+        if room.locked:
+            # FIXME: the current behaviour is to create an instant room
+            # and send the signal only when the room is unlocked
+            # a proper configuration management should be done
+            log.debug(_("room locked !"))
+            d = client._muc_client.configure(room.roomJID, {})
+            d.addErrback(self.host.log_errback,
+                         msg=_('Error while configuring the room: {failure_}'))
+        return room.fully_joined
+
+    def _join_eb(self, failure_, client, room_jid, nick, password):
+        """Called when something is going wrong when joining the room"""
+        try:
+            condition = failure_.value.condition
+        except AttributeError:
+            msg_suffix = f': {failure_}'
+        else:
+            if condition == 'conflict':
+                # we have a nickname conflict, we try again with "_" suffixed to current nickname
+                nick += '_'
+                return client._muc_client.join(room_jid, nick, password).addCallbacks(self._join_cb, self._join_eb, (client, room_jid, nick), errbackArgs=(client, room_jid, nick, password))
+            elif condition == 'not-allowed':
+                # room is restricted, we need a password
+                password_ui = xml_tools.XMLUI("form", title=D_('Room {} is restricted').format(room_jid.userhost()), submit_id='')
+                password_ui.addText(D_("This room is restricted, please enter the password"))
+                password_ui.addPassword('password')
+                d = xml_tools.defer_xmlui(self.host, password_ui, profile=client.profile)
+                d.addCallback(self._password_ui_cb, client, room_jid, nick)
+                return d
+
+            msg_suffix = ' with condition "{}"'.format(failure_.value.condition)
+
+        mess = D_("Error while joining the room {room}{suffix}".format(
+            room = room_jid.userhost(), suffix = msg_suffix))
+        log.warning(mess)
+        xmlui = xml_tools.note(mess, D_("Group chat error"), level=C.XMLUI_DATA_LVL_ERROR)
+        self.host.action_new({'xmlui': xmlui.toXml()}, profile=client.profile)
+
+    @staticmethod
+    def _get_occupants(room):
+        """Get occupants of a room in a form suitable for bridge"""
+        return {u.nick: {k:str(getattr(u,k) or '') for k in OCCUPANT_KEYS} for u in list(room.roster.values())}
+
+    def _get_room_occupants(self, room_jid_s, profile_key):
+        client = self.host.get_client(profile_key)
+        room_jid = jid.JID(room_jid_s)
+        return self.get_room_occupants(client, room_jid)
+
+    def get_room_occupants(self, client, room_jid):
+        room = self.get_room(client, room_jid)
+        return self._get_occupants(room)
+
+    def _get_rooms_joined(self, profile_key=C.PROF_KEY_NONE):
+        client = self.host.get_client(profile_key)
+        return self.get_rooms_joined(client)
+
+    def get_rooms_joined(self, client):
+        """Return rooms where user is"""
+        result = []
+        for room in list(client._muc_client.joined_rooms.values()):
+            if room.state == ROOM_STATE_LIVE:
+                result.append(
+                    (room.roomJID.userhost(),
+                     self._get_occupants(room),
+                     room.nick,
+                     room.subject,
+                     [s.name for s in room.statuses],
+                    )
+                )
+        return result
+
+    def _get_room_nick(self, room_jid_s, profile_key=C.PROF_KEY_NONE):
+        client = self.host.get_client(profile_key)
+        return self.get_room_nick(client, jid.JID(room_jid_s))
+
+    def get_room_nick(self, client, room_jid):
+        """return nick used in room by user
+
+        @param room_jid (jid.JID): JID of the room
+        @profile_key: profile
+        @return: nick or empty string in case of error
+        @raise exceptions.Notfound: use has not joined the room
+        """
+        self.check_room_joined(client, room_jid)
+        return client._muc_client.joined_rooms[room_jid].nick
+
+    def _configure_room(self, room_jid_s, profile_key=C.PROF_KEY_NONE):
+        client = self.host.get_client(profile_key)
+        d = self.configure_room(client, jid.JID(room_jid_s))
+        d.addCallback(lambda xmlui: xmlui.toXml())
+        return d
+
+    def _configure_room_menu(self, menu_data, profile):
+        """Return room configuration form
+
+        @param menu_data: %(menu_data)s
+        @param profile: %(doc_profile)s
+        """
+        client = self.host.get_client(profile)
+        try:
+            room_jid = jid.JID(menu_data['room_jid'])
+        except KeyError:
+            log.error(_("room_jid key is not present !"))
+            return defer.fail(exceptions.DataError)
+
+        def xmlui_received(xmlui):
+            if not xmlui:
+                msg = D_("No configuration available for this room")
+                return {"xmlui": xml_tools.note(msg).toXml()}
+            return {"xmlui": xmlui.toXml()}
+        return self.configure_room(client, room_jid).addCallback(xmlui_received)
+
+    def configure_room(self, client, room_jid):
+        """return the room configuration form
+
+        @param room: jid of the room to configure
+        @return: configuration form as XMLUI
+        """
+        self.check_room_joined(client, room_jid)
+
+        def config_2_xmlui(result):
+            if not result:
+                return ""
+            session_id, session_data = self._sessions.new_session(profile=client.profile)
+            session_data["room_jid"] = room_jid
+            xmlui = xml_tools.data_form_2_xmlui(result, submit_id=self.__submit_conf_id)
+            xmlui.session_id = session_id
+            return xmlui
+
+        d = client._muc_client.getConfiguration(room_jid)
+        d.addCallback(config_2_xmlui)
+        return d
+
+    def _submit_configuration(self, raw_data, profile):
+        cancelled = C.bool(raw_data.get("cancelled", C.BOOL_FALSE))
+        if cancelled:
+            return defer.succeed({})
+        client = self.host.get_client(profile)
+        try:
+            session_data = self._sessions.profile_get(raw_data["session_id"], profile)
+        except KeyError:
+            log.warning(D_("Session ID doesn't exist, session has probably expired."))
+            _dialog = xml_tools.XMLUI('popup', title=D_('Room configuration failed'))
+            _dialog.addText(D_("Session ID doesn't exist, session has probably expired."))
+            return defer.succeed({'xmlui': _dialog.toXml()})
+
+        data = xml_tools.xmlui_result_2_data_form_result(raw_data)
+        d = client._muc_client.configure(session_data['room_jid'], data)
+        _dialog = xml_tools.XMLUI('popup', title=D_('Room configuration succeed'))
+        _dialog.addText(D_("The new settings have been saved."))
+        d.addCallback(lambda ignore: {'xmlui': _dialog.toXml()})
+        del self._sessions[raw_data["session_id"]]
+        return d
+
+    def is_nick_in_room(self, client, room_jid, nick):
+        """Tell if a nick is currently present in a room"""
+        self.check_room_joined(client, room_jid)
+        return client._muc_client.joined_rooms[room_jid].inRoster(muc.User(nick))
+
+    def _get_muc_service(self, jid_=None, profile=C.PROF_KEY_NONE):
+        client = self.host.get_client(profile)
+        d = defer.ensureDeferred(self.get_muc_service(client, jid_ or None))
+        d.addCallback(lambda service_jid: service_jid.full() if service_jid is not None else '')
+        return d
+
+    async def get_muc_service(
+        self,
+        client: SatXMPPEntity,
+        jid_: Optional[jid.JID] = None) -> Optional[jid.JID]:
+        """Return first found MUC service of an entity
+
+        @param jid_: entity which may have a MUC service, or None for our own server
+        @return: found service jid or None
+        """
+        if jid_ is None:
+            try:
+                muc_service = client.muc_service
+            except AttributeError:
+                pass
+            else:
+                # we have a cached value, we return it
+                return muc_service
+        services = await self.host.find_service_entities(client, "conference", "text", jid_)
+        for service in services:
+            if ".irc." not in service.userhost():
+                # FIXME:
+                # This ugly hack is here to avoid an issue with openfire: the IRC gateway
+                # use "conference/text" identity (instead of "conference/irc")
+                muc_service = service
+                break
+        else:
+            muc_service = None
+        return muc_service
+
+    def _get_unique_name(self, muc_service="", profile_key=C.PROF_KEY_NONE):
+        client = self.host.get_client(profile_key)
+        return self.get_unique_name(client, muc_service or None).full()
+
+    def get_unique_name(self, client, muc_service=None):
+        """Return unique name for a room, avoiding collision
+
+        @param muc_service (jid.JID) : leave empty string to use the default service
+        @return: jid.JID (unique room bare JID)
+        """
+        # TODO: we should use #RFC-0045 10.1.4 when available here
+        room_name = str(uuid.uuid4())
+        if muc_service is None:
+            try:
+                muc_service = client.muc_service
+            except AttributeError:
+                raise exceptions.NotReady("Main server MUC service has not been checked yet")
+            if muc_service is None:
+                log.warning(_("No MUC service found on main server"))
+                raise exceptions.FeatureNotFound
+
+        muc_service = muc_service.userhost()
+        return jid.JID("{}@{}".format(room_name, muc_service))
+
+    def get_default_muc(self):
+        """Return the default MUC.
+
+        @return: unicode
+        """
+        return self.host.memory.config_get(CONFIG_SECTION, 'default_muc', default_conf['default_muc'])
+
+    def _join_eb(self, failure_, client):
+        failure_.trap(AlreadyJoined)
+        room = failure_.value.room
+        return [True] + self._get_room_joined_args(room, client.profile)
+
+    def _join(self, room_jid_s, nick, options, profile_key=C.PROF_KEY_NONE):
+        """join method used by bridge
+
+        @return (tuple): already_joined boolean + room joined arguments (see [_get_room_joined_args])
+        """
+        client = self.host.get_client(profile_key)
+        if room_jid_s:
+            muc_service = client.muc_service
+            try:
+                room_jid = jid.JID(room_jid_s)
+            except (RuntimeError, jid.InvalidFormat, AttributeError):
+                return defer.fail(jid.InvalidFormat(_("Invalid room identifier: {room_id}'. Please give a room short or full identifier like 'room' or 'room@{muc_service}'.").format(
+                    room_id=room_jid_s,
+                    muc_service=str(muc_service))))
+            if not room_jid.user:
+                room_jid.user, room_jid.host = room_jid.host, muc_service
+        else:
+            room_jid = self.get_unique_name(profile_key=client.profile)
+        # TODO: error management + signal in bridge
+        d = self.join(client, room_jid, nick, options or None)
+        d.addCallback(lambda room: [False] + self._get_room_joined_args(room, client.profile))
+        d.addErrback(self._join_eb, client)
+        return d
+
+    async def join(
+        self,
+        client: SatXMPPEntity,
+        room_jid: jid.JID,
+        nick: Optional[str] = None,
+        options: Optional[dict] = None
+    ) -> Optional[muc.Room]:
+        if not nick:
+            nick = client.jid.user
+        if options is None:
+            options = {}
+        if room_jid in client._muc_client.joined_rooms:
+            room = client._muc_client.joined_rooms[room_jid]
+            log.info(_('{profile} is already in room {room_jid}').format(
+                profile=client.profile, room_jid = room_jid.userhost()))
+            raise AlreadyJoined(room)
+        log.info(_("[{profile}] is joining room {room} with nick {nick}").format(
+            profile=client.profile, room=room_jid.userhost(), nick=nick))
+        self.host.bridge.muc_room_prepare_join(room_jid.userhost(), client.profile)
+
+        password = options.get("password")
+
+        try:
+            room = await client._muc_client.join(room_jid, nick, password)
+        except Exception as e:
+            room = await utils.as_deferred(
+                self._join_eb(failure.Failure(e), client, room_jid, nick, password)
+            )
+        else:
+            await defer.ensureDeferred(
+                self._join_cb(room, client, room_jid, nick)
+            )
+        return room
+
+    def pop_rooms(self, client):
+        """Remove rooms and return data needed to re-join them
+
+        This methods is to be called before a hot reconnection
+        @return (list[(jid.JID, unicode)]): arguments needed to re-join the rooms
+            This list can be used directly (unpacked) with self.join
+        """
+        args_list = []
+        for room in list(client._muc_client.joined_rooms.values()):
+            client._muc_client._removeRoom(room.roomJID)
+            args_list.append((client, room.roomJID, room.nick))
+        return args_list
+
+    def _nick(self, room_jid_s, nick, profile_key=C.PROF_KEY_NONE):
+        client = self.host.get_client(profile_key)
+        return self.nick(client, jid.JID(room_jid_s), nick)
+
+    def nick(self, client, room_jid, nick):
+        """Change nickname in a room"""
+        self.check_room_joined(client, room_jid)
+        return client._muc_client.nick(room_jid, nick)
+
+    def _leave(self, room_jid, profile_key):
+        client = self.host.get_client(profile_key)
+        return self.leave(client, jid.JID(room_jid))
+
+    def leave(self, client, room_jid):
+        self.check_room_joined(client, room_jid)
+        return client._muc_client.leave(room_jid)
+
+    def _subject(self, room_jid_s, new_subject, profile_key):
+        client = self.host.get_client(profile_key)
+        return self.subject(client, jid.JID(room_jid_s), new_subject)
+
+    def subject(self, client, room_jid, subject):
+        self.check_room_joined(client, room_jid)
+        return client._muc_client.subject(room_jid, subject)
+
+    def get_handler(self, client):
+        # create a MUC client and associate it with profile' session
+        muc_client = client._muc_client = LiberviaMUCClient(self)
+        return muc_client
+
+    def kick(self, client, nick, room_jid, options=None):
+        """Kick a participant from the room
+
+        @param nick (str): nick of the user to kick
+        @param room_jid_s (JID): jid of the room
+        @param options (dict): attribute with extra info (reason, password) as in #XEP-0045
+        """
+        if options is None:
+            options = {}
+        self.check_room_joined(client, room_jid)
+        return client._muc_client.kick(room_jid, nick, reason=options.get('reason', None))
+
+    def ban(self, client, entity_jid, room_jid, options=None):
+        """Ban an entity from the room
+
+        @param entity_jid (JID): bare jid of the entity to be banned
+        @param room_jid (JID): jid of the room
+        @param options: attribute with extra info (reason, password) as in #XEP-0045
+        """
+        self.check_room_joined(client, room_jid)
+        if options is None:
+            options = {}
+        assert not entity_jid.resource
+        assert not room_jid.resource
+        return client._muc_client.ban(room_jid, entity_jid, reason=options.get('reason', None))
+
+    def affiliate(self, client, entity_jid, room_jid, options):
+        """Change the affiliation of an entity
+
+        @param entity_jid (JID): bare jid of the entity
+        @param room_jid_s (JID): jid of the room
+        @param options: attribute with extra info (reason, nick) as in #XEP-0045
+        """
+        self.check_room_joined(client, room_jid)
+        assert not entity_jid.resource
+        assert not room_jid.resource
+        assert 'affiliation' in options
+        # TODO: handles reason and nick
+        return client._muc_client.modifyAffiliationList(room_jid, [entity_jid], options['affiliation'])
+
+    # Text commands #
+
+    def cmd_nick(self, client, mess_data):
+        """change nickname
+
+        @command (group): new_nick
+            - new_nick: new nick to use
+        """
+        nick = mess_data["unparsed"].strip()
+        if nick:
+            room = mess_data["to"]
+            self.nick(client, room, nick)
+
+        return False
+
+    def cmd_join(self, client, mess_data):
+        """join a new room
+
+        @command (all): JID
+            - JID: room to join (on the same service if full jid is not specified)
+        """
+        room_raw = mess_data["unparsed"].strip()
+        if room_raw:
+            if self.is_joined_room(client, mess_data["to"]):
+                # we use the same service as the one from the room where the command has
+                # been entered if full jid is not entered
+                muc_service = mess_data["to"].host
+                nick = self.get_room_nick(client, mess_data["to"]) or client.jid.user
+            else:
+                # the command has been entered in a one2one conversation, so we use
+                # our server MUC service as default service
+                muc_service = client.muc_service or ""
+                nick = client.jid.user
+            room_jid = self.text_cmds.get_room_jid(room_raw, muc_service)
+            self.join(client, room_jid, nick, {})
+
+        return False
+
+    def cmd_leave(self, client, mess_data):
+        """quit a room
+
+        @command (group): [ROOM_JID]
+            - ROOM_JID: jid of the room to live (current room if not specified)
+        """
+        room_raw = mess_data["unparsed"].strip()
+        if room_raw:
+            room = self.text_cmds.get_room_jid(room_raw, mess_data["to"].host)
+        else:
+            room = mess_data["to"]
+
+        self.leave(client, room)
+
+        return False
+
+    def cmd_part(self, client, mess_data):
+        """just a synonym of /leave
+
+        @command (group): [ROOM_JID]
+            - ROOM_JID: jid of the room to live (current room if not specified)
+        """
+        return self.cmd_leave(client, mess_data)
+
+    def cmd_kick(self, client, mess_data):
+        """kick a room member
+
+        @command (group): ROOM_NICK
+            - ROOM_NICK: the nick of the person to kick
+        """
+        options = mess_data["unparsed"].strip().split()
+        try:
+            nick = options[0]
+            assert self.is_nick_in_room(client, mess_data["to"], nick)
+        except (IndexError, AssertionError):
+            feedback = _("You must provide a member's nick to kick.")
+            self.text_cmds.feed_back(client, feedback, mess_data)
+            return False
+
+        reason = ' '.join(options[1:]) if len(options) > 1 else None
+
+        d = self.kick(client, nick, mess_data["to"], {"reason": reason})
+
+        def cb(__):
+            feedback_msg = _('You have kicked {}').format(nick)
+            if reason is not None:
+                feedback_msg += _(' for the following reason: {reason}').format(
+                    reason=reason
+                )
+            self.text_cmds.feed_back(client, feedback_msg, mess_data)
+            return True
+        d.addCallback(cb)
+        return d
+
+    def cmd_ban(self, client, mess_data):
+        """ban an entity from the room
+
+        @command (group): (JID) [reason]
+            - JID: the JID of the entity to ban
+            - reason: the reason why this entity is being banned
+        """
+        options = mess_data["unparsed"].strip().split()
+        try:
+            jid_s = options[0]
+            entity_jid = jid.JID(jid_s).userhostJID()
+            assert(entity_jid.user)
+            assert(entity_jid.host)
+        except (RuntimeError, jid.InvalidFormat, AttributeError, IndexError,
+                AssertionError):
+            feedback = _(
+                "You must provide a valid JID to ban, like in '/ban contact@example.net'"
+            )
+            self.text_cmds.feed_back(client, feedback, mess_data)
+            return False
+
+        reason = ' '.join(options[1:]) if len(options) > 1 else None
+
+        d = self.ban(client, entity_jid, mess_data["to"], {"reason": reason})
+
+        def cb(__):
+            feedback_msg = _('You have banned {}').format(entity_jid)
+            if reason is not None:
+                feedback_msg += _(' for the following reason: {reason}').format(
+                    reason=reason
+                )
+            self.text_cmds.feed_back(client, feedback_msg, mess_data)
+            return True
+        d.addCallback(cb)
+        return d
+
+    def cmd_affiliate(self, client, mess_data):
+        """affiliate an entity to the room
+
+        @command (group): (JID) [owner|admin|member|none|outcast]
+            - JID: the JID of the entity to affiliate
+            - owner: grant owner privileges
+            - admin: grant admin privileges
+            - member: grant member privileges
+            - none: reset entity privileges
+            - outcast: ban entity
+        """
+        options = mess_data["unparsed"].strip().split()
+        try:
+            jid_s = options[0]
+            entity_jid = jid.JID(jid_s).userhostJID()
+            assert(entity_jid.user)
+            assert(entity_jid.host)
+        except (RuntimeError, jid.InvalidFormat, AttributeError, IndexError, AssertionError):
+            feedback = _("You must provide a valid JID to affiliate, like in '/affiliate contact@example.net member'")
+            self.text_cmds.feed_back(client, feedback, mess_data)
+            return False
+
+        affiliation = options[1] if len(options) > 1 else 'none'
+        if affiliation not in AFFILIATIONS:
+            feedback = _("You must provide a valid affiliation: %s") % ' '.join(AFFILIATIONS)
+            self.text_cmds.feed_back(client, feedback, mess_data)
+            return False
+
+        d = self.affiliate(client, entity_jid, mess_data["to"], {'affiliation': affiliation})
+
+        def cb(__):
+            feedback_msg = _('New affiliation for {entity}: {affiliation}').format(
+                entity=entity_jid, affiliation=affiliation)
+            self.text_cmds.feed_back(client, feedback_msg, mess_data)
+            return True
+        d.addCallback(cb)
+        return d
+
+    def cmd_title(self, client, mess_data):
+        """change room's subject
+
+        @command (group): title
+            - title: new room subject
+        """
+        subject = mess_data["unparsed"].strip()
+
+        if subject:
+            room = mess_data["to"]
+            self.subject(client, room, subject)
+
+        return False
+
+    def cmd_topic(self, client, mess_data):
+        """just a synonym of /title
+
+        @command (group): title
+            - title: new room subject
+        """
+        return self.cmd_title(client, mess_data)
+
+    def cmd_list(self, client, mess_data):
+        """list available rooms in a muc server
+
+        @command (all): [MUC_SERVICE]
+            - MUC_SERVICE: service to request
+               empty value will request room's service for a room,
+               or user's server default MUC service in a one2one chat
+        """
+        unparsed = mess_data["unparsed"].strip()
+        try:
+            service = jid.JID(unparsed)
+        except RuntimeError:
+            if mess_data['type'] == C.MESS_TYPE_GROUPCHAT:
+                room_jid = mess_data["to"]
+                service = jid.JID(room_jid.host)
+            elif client.muc_service is not None:
+                service = client.muc_service
+            else:
+                msg = D_("No known default MUC service {unparsed}").format(
+                    unparsed=unparsed)
+                self.text_cmds.feed_back(client, msg, mess_data)
+                return False
+        except jid.InvalidFormat:
+            msg = D_("{} is not a valid JID!".format(unparsed))
+            self.text_cmds.feed_back(client, msg, mess_data)
+            return False
+        d = self.host.getDiscoItems(client, service)
+        d.addCallback(self._show_list_ui, client, service)
+
+        return False
+
+    def _whois(self, client, whois_msg, mess_data, target_jid):
+        """ Add MUC user information to whois """
+        if mess_data['type'] != "groupchat":
+            return
+        if target_jid.userhostJID() not in client._muc_client.joined_rooms:
+            log.warning(_("This room has not been joined"))
+            return
+        if not target_jid.resource:
+            return
+        user = client._muc_client.joined_rooms[target_jid.userhostJID()].getUser(target_jid.resource)
+        whois_msg.append(_("Nickname: %s") % user.nick)
+        if user.entity:
+            whois_msg.append(_("Entity: %s") % user.entity)
+        if user.affiliation != 'none':
+            whois_msg.append(_("Affiliation: %s") % user.affiliation)
+        if user.role != 'none':
+            whois_msg.append(_("Role: %s") % user.role)
+        if user.status:
+            whois_msg.append(_("Status: %s") % user.status)
+        if user.show:
+            whois_msg.append(_("Show: %s") % user.show)
+
+    def presence_trigger(self, presence_elt, client):
+        # FIXME: should we add a privacy parameters in settings to activate before
+        #        broadcasting the presence to all MUC rooms ?
+        muc_client = client._muc_client
+        for room_jid, room in muc_client.joined_rooms.items():
+            elt = xml_tools.element_copy(presence_elt)
+            elt['to'] = room_jid.userhost() + '/' + room.nick
+            client.presence.send(elt)
+        return True
+
+    def presence_received_trigger(self, client, entity, show, priority, statuses):
+        entity_bare = entity.userhostJID()
+        muc_client = client._muc_client
+        if entity_bare in muc_client.joined_rooms:
+            # presence is already handled in (un)availableReceived
+            return False
+        return True
+
+
+@implementer(iwokkel.IDisco)
+class LiberviaMUCClient(muc.MUCClient):
+
+    def __init__(self, plugin_parent):
+        self.plugin_parent = plugin_parent
+        muc.MUCClient.__init__(self)
+        self._changing_nicks = set()  # used to keep trace of who is changing nick,
+                                      # and to discard userJoinedRoom signal in this case
+        print("init SatMUCClient OK")
+
+    @property
+    def joined_rooms(self):
+        return self._rooms
+
+    @property
+    def host(self):
+        return self.plugin_parent.host
+
+    @property
+    def client(self):
+        return self.parent
+
+    @property
+    def _mam(self):
+        return self.plugin_parent._mam
+
+    @property
+    def _si(self):
+        return self.plugin_parent._si
+
+    def change_room_state(self, room, new_state):
+        """Check that room is in expected state, and change it
+
+        @param new_state: one of ROOM_STATE_*
+        """
+        new_state_idx = ROOM_STATES.index(new_state)
+        if new_state_idx == -1:
+            raise exceptions.InternalError("unknown room state")
+        if new_state_idx < 1:
+            raise exceptions.InternalError("unexpected new room state ({room}): {state}".format(
+                room=room.userhost(),
+                state=new_state))
+        expected_state = ROOM_STATES[new_state_idx-1]
+        if room.state != expected_state:
+            log.error(_(
+                "room {room} is not in expected state: room is in state {current_state} "
+                "while we were expecting {expected_state}").format(
+                room=room.roomJID.userhost(),
+                current_state=room.state,
+                expected_state=expected_state))
+        room.state = new_state
+
+    def _addRoom(self, room):
+        super(LiberviaMUCClient, self)._addRoom(room)
+        room._roster_ok = False  # True when occupants list has been fully received
+        room.state = ROOM_STATE_OCCUPANTS
+        # FIXME: check if history_d is not redundant with fully_joined
+        room.fully_joined = defer.Deferred()  # called when everything is OK
+        # cache data until room is ready
+        # list of elements which will be re-injected in stream
+        room._cache = []
+        # we only need to keep last presence status for each jid, so a dict is suitable
+        room._cache_presence = {}
+
+    async def _join_legacy(
+        self,
+        client: SatXMPPEntity,
+        room_jid: jid.JID,
+        nick: str,
+        password: Optional[str]
+    ) -> muc.Room:
+        """Join room an retrieve history with legacy method"""
+        mess_data_list = await self.host.memory.history_get(
+            room_jid,
+            client.jid.userhostJID(),
+            limit=1,
+            between=True,
+            profile=client.profile
+        )
+        if mess_data_list:
+            timestamp = mess_data_list[0][1]
+            # we use seconds since last message to get backlog without duplicates
+            # and we remove 1 second to avoid getting the last message again
+            seconds = int(time.time() - timestamp) - 1
+        else:
+            seconds = None
+
+        room = await super(LiberviaMUCClient, self).join(
+            room_jid, nick, muc.HistoryOptions(seconds=seconds), password)
+        # used to send bridge signal once backlog are written in history
+        room._history_type = HISTORY_LEGACY
+        room._history_d = defer.Deferred()
+        room._history_d.callback(None)
+        return room
+
+    async def _get_mam_history(
+        self,
+        client: SatXMPPEntity,
+        room: muc.Room,
+        room_jid: jid.JID
+    ) -> None:
+        """Retrieve history for rooms handling MAM"""
+        history_d = room._history_d = defer.Deferred()
+        # we trigger now the deferred so all callback are processed as soon as possible
+        # and in order
+        history_d.callback(None)
+
+        last_mess = await self.host.memory.history_get(
+            room_jid,
+            None,
+            limit=1,
+            between=False,
+            filters={
+                'types': C.MESS_TYPE_GROUPCHAT,
+                'last_stanza_id': True},
+            profile=client.profile)
+        if last_mess:
+            stanza_id = last_mess[0][-1]['stanza_id']
+            rsm_req = rsm.RSMRequest(max_=20, after=stanza_id)
+            no_loop=False
+        else:
+            log.info("We have no MAM archive for room {room_jid}.".format(
+                room_jid=room_jid))
+            # we don't want the whole archive if we have no archive yet
+            # as it can be huge
+            rsm_req = rsm.RSMRequest(max_=50, before='')
+            no_loop=True
+
+        mam_req = mam.MAMRequest(rsm_=rsm_req)
+        complete = False
+        count = 0
+        while not complete:
+            try:
+                mam_data = await self._mam.get_archives(client, mam_req,
+                                                       service=room_jid)
+            except xmpp_error.StanzaError as e:
+                if last_mess and e.condition == 'item-not-found':
+                    log.info(
+                        f"requested item (with id {stanza_id!r}) can't be found in "
+                        f"history of {room_jid}, history has probably been purged on "
+                        f"server.")
+                    # we get last items like for a new room
+                    rsm_req = rsm.RSMRequest(max_=50, before='')
+                    mam_req = mam.MAMRequest(rsm_=rsm_req)
+                    no_loop=True
+                    continue
+                else:
+                    raise e
+            elt_list, rsm_response, mam_response = mam_data
+            complete = True if no_loop else mam_response["complete"]
+            # we update MAM request for next iteration
+            mam_req.rsm.after = rsm_response.last
+
+            if not elt_list:
+                break
+            else:
+                count += len(elt_list)
+
+                for mess_elt in elt_list:
+                    try:
+                        fwd_message_elt = self._mam.get_message_from_result(
+                            client, mess_elt, mam_req, service=room_jid)
+                    except exceptions.DataError:
+                        continue
+                    if fwd_message_elt.getAttribute("to"):
+                        log.warning(
+                            'Forwarded message element has a "to" attribute while it is '
+                            'forbidden by specifications')
+                    fwd_message_elt["to"] = client.jid.full()
+                    try:
+                        mess_data = client.messageProt.parse_message(fwd_message_elt)
+                    except Exception as e:
+                        log.error(
+                            f"Can't parse message, ignoring it: {e}\n"
+                            f"{fwd_message_elt.toXml()}"
+                        )
+                        continue
+                    # we attache parsed message data to element, to avoid parsing
+                    # again in _add_to_history
+                    fwd_message_elt._mess_data = mess_data
+                    # and we inject to MUC workflow
+                    client._muc_client._onGroupChat(fwd_message_elt)
+
+        if not count:
+            log.info(_("No message received while offline in {room_jid}".format(
+                room_jid=room_jid)))
+        else:
+            log.info(
+                _("We have received {num_mess} message(s) in {room_jid} while "
+                  "offline.")
+                .format(num_mess=count, room_jid=room_jid))
+
+        # for legacy history, the following steps are done in receivedSubject but for MAM
+        # the order is different (we have to join then get MAM archive, so subject
+        # is received before archive), so we change state and add the callbacks here.
+        self.change_room_state(room, ROOM_STATE_LIVE)
+        history_d.addCallbacks(self._history_cb, self._history_eb, [room],
+                                     errbackArgs=[room])
+
+        # we wait for all callbacks to be processed
+        await history_d
+
+    async def _join_mam(
+        self,
+        client: SatXMPPEntity,
+        room_jid: jid.JID,
+        nick: str,
+        password: Optional[str]
+    ) -> muc.Room:
+        """Join room and retrieve history using MAM"""
+        room = await super(LiberviaMUCClient, self).join(
+            # we don't want any history from room as we'll get it with MAM
+            room_jid, nick, muc.HistoryOptions(maxStanzas=0), password=password
+        )
+        room._history_type = HISTORY_MAM
+        # MAM history retrieval can be very long, and doesn't need to be sync, so we don't
+        # wait for it
+        defer.ensureDeferred(self._get_mam_history(client, room, room_jid))
+        room.fully_joined.callback(room)
+
+        return room
+
+    async def join(self, room_jid, nick, password=None):
+        room_service = jid.JID(room_jid.host)
+        has_mam = await self.host.hasFeature(self.client, mam.NS_MAM, room_service)
+        if not self._mam or not has_mam:
+            return await self._join_legacy(self.client, room_jid, nick, password)
+        else:
+            return await self._join_mam(self.client, room_jid, nick, password)
+
+    ## presence/roster ##
+
+    def availableReceived(self, presence):
+        """
+        Available presence was received.
+        """
+        # XXX: we override MUCClient.availableReceived to fix bugs
+        # (affiliation and role are not set)
+
+        room, user = self._getRoomUser(presence)
+
+        if room is None:
+            return
+
+        if user is None:
+            nick = presence.sender.resource
+            if not nick:
+                log.warning(_("missing nick in presence: {xml}").format(
+                    xml = presence.toElement().toXml()))
+                return
+            user = muc.User(nick, presence.entity)
+
+        # we want to keep statuses with room
+        # XXX: presence if broadcasted, and we won't have status code
+        #      like 110 (REALJID_PUBLIC) after first <presence/> received
+        #      so we keep only the initial <presence> (with SELF_PRESENCE),
+        #      thus we check if attribute already exists
+        if (not hasattr(room, 'statuses')
+            and muc.STATUS_CODE.SELF_PRESENCE in presence.mucStatuses):
+            room.statuses = presence.mucStatuses
+
+        # Update user data
+        user.role = presence.role
+        user.affiliation = presence.affiliation
+        user.status = presence.status
+        user.show = presence.show
+
+        if room.inRoster(user):
+            self.userUpdatedStatus(room, user, presence.show, presence.status)
+        else:
+            room.addUser(user)
+            self.userJoinedRoom(room, user)
+
+    def unavailableReceived(self, presence):
+        # XXX: we override this method to manage nickname change
+        """
+        Unavailable presence was received.
+
+        If this was received from a MUC room occupant JID, that occupant has
+        left the room.
+        """
+        room, user = self._getRoomUser(presence)
+
+        if room is None or user is None:
+            return
+
+        room.removeUser(user)
+
+        if muc.STATUS_CODE.NEW_NICK in presence.mucStatuses:
+            self._changing_nicks.add(presence.nick)
+            self.user_changed_nick(room, user, presence.nick)
+        else:
+            self._changing_nicks.discard(presence.nick)
+            self.userLeftRoom(room, user)
+
+    def userJoinedRoom(self, room, user):
+        if user.nick == room.nick:
+            # we have received our own nick,
+            # this mean that the full room roster was received
+            self.change_room_state(room, ROOM_STATE_SELF_PRESENCE)
+            log.debug("room {room} joined with nick {nick}".format(
+                room=room.occupantJID.userhost(), nick=user.nick))
+            # we set type so we don't have to use a deferred
+            # with disco to check entity type
+            self.host.memory.update_entity_data(
+                self.client, room.roomJID, C.ENTITY_TYPE, C.ENTITY_TYPE_MUC
+            )
+        elif room.state not in (ROOM_STATE_OCCUPANTS, ROOM_STATE_LIVE):
+            log.warning(
+                "Received user presence data in a room before its initialisation "
+                "(current state: {state}),"
+                "this is not standard! Ignoring it: {room} ({nick})".format(
+                    state=room.state,
+                    room=room.roomJID.userhost(),
+                    nick=user.nick))
+            return
+        else:
+            if not room.fully_joined.called:
+                return
+            try:
+                self._changing_nicks.remove(user.nick)
+            except KeyError:
+                # this is a new user
+                log.debug(_("user {nick} has joined room {room_id}").format(
+                    nick=user.nick, room_id=room.occupantJID.userhost()))
+                if not self.host.trigger.point(
+                        "MUC user joined", room, user, self.client.profile):
+                    return
+
+                extra = {'info_type': ROOM_USER_JOINED,
+                         'user_affiliation': user.affiliation,
+                         'user_role': user.role,
+                         'user_nick': user.nick
+                         }
+                if user.entity is not None:
+                    extra['user_entity'] = user.entity.full()
+                mess_data = {  # dict is similar to the one used in client.onMessage
+                    "from": room.roomJID,
+                    "to": self.client.jid,
+                    "uid": str(uuid.uuid4()),
+                    "message": {'': D_("=> {} has joined the room").format(user.nick)},
+                    "subject": {},
+                    "type": C.MESS_TYPE_INFO,
+                    "extra": extra,
+                    "timestamp": time.time(),
+                }
+                # FIXME: we disable presence in history as it's taking a lot of space
+                #        while not indispensable. In the future an option may allow
+                #        to re-enable it
+                # self.client.message_add_to_history(mess_data)
+                self.client.message_send_to_bridge(mess_data)
+
+
+    def userLeftRoom(self, room, user):
+        if not self.host.trigger.point("MUC user left", room, user, self.client.profile):
+            return
+        if user.nick == room.nick:
+            # we left the room
+            room_jid_s = room.roomJID.userhost()
+            log.info(_("Room ({room}) left ({profile})").format(
+                room = room_jid_s, profile = self.client.profile))
+            self.host.memory.del_entity_cache(room.roomJID, profile_key=self.client.profile)
+            self.host.bridge.muc_room_left(room.roomJID.userhost(), self.client.profile)
+        elif room.state != ROOM_STATE_LIVE:
+            log.warning("Received user presence data in a room before its initialisation (current state: {state}),"
+                "this is not standard! Ignoring it: {room} ({nick})".format(
+                state=room.state,
+                room=room.roomJID.userhost(),
+                nick=user.nick))
+            return
+        else:
+            if not room.fully_joined.called:
+                return
+            log.debug(_("user {nick} left room {room_id}").format(nick=user.nick, room_id=room.occupantJID.userhost()))
+            extra = {'info_type': ROOM_USER_LEFT,
+                     'user_affiliation': user.affiliation,
+                     'user_role': user.role,
+                     'user_nick': user.nick
+                     }
+            if user.entity is not None:
+                extra['user_entity'] = user.entity.full()
+            mess_data = {  # dict is similar to the one used in client.onMessage
+                "from": room.roomJID,
+                "to": self.client.jid,
+                "uid": str(uuid.uuid4()),
+                "message": {'': D_("<= {} has left the room").format(user.nick)},
+                "subject": {},
+                "type": C.MESS_TYPE_INFO,
+                "extra": extra,
+                "timestamp": time.time(),
+            }
+            # FIXME: disable history, see userJoinRoom comment
+            # self.client.message_add_to_history(mess_data)
+            self.client.message_send_to_bridge(mess_data)
+
+    def user_changed_nick(self, room, user, new_nick):
+        self.host.bridge.muc_room_user_changed_nick(room.roomJID.userhost(), user.nick, new_nick, self.client.profile)
+
+    def userUpdatedStatus(self, room, user, show, status):
+        entity = jid.JID(tuple=(room.roomJID.user, room.roomJID.host, user.nick))
+        if hasattr(room, "_cache_presence"):
+            # room has a cache for presence, meaning it has not been fully
+            # joined yet. So we put presence in cache, and stop workflow.
+            # Or delete current presence and continue workflow if it's an
+            # "unavailable" presence
+            cache = room._cache_presence
+            cache[entity] = {
+                "room": room,
+                "user": user,
+                "show": show,
+                "status": status,
+                }
+            return
+        statuses = {C.PRESENCE_STATUSES_DEFAULT: status or ''}
+        self.host.bridge.presence_update(
+            entity.full(), show or '', 0, statuses, self.client.profile)
+
+    ## messages ##
+
+    def receivedGroupChat(self, room, user, body):
+        log.debug('receivedGroupChat: room=%s user=%s body=%s' % (room.roomJID.full(), user, body))
+
+    def _add_to_history(self, __, user, message):
+        try:
+            # message can be already parsed (with MAM), in this case mess_data
+            # it attached to the element
+            mess_data = message.element._mess_data
+        except AttributeError:
+            mess_data = self.client.messageProt.parse_message(message.element)
+        if mess_data['message'] or mess_data['subject']:
+            return defer.ensureDeferred(
+                self.host.memory.add_to_history(self.client, mess_data)
+            )
+        else:
+            return defer.succeed(None)
+
+    def _add_to_history_eb(self, failure):
+        failure.trap(exceptions.CancelError)
+
+    def receivedHistory(self, room, user, message):
+        """Called when history (backlog) message are received
+
+        we check if message is not already in our history
+        and add it if needed
+        @param room(muc.Room): room instance
+        @param user(muc.User, None): the user that sent the message
+            None if the message come from the room
+        @param message(muc.GroupChat): the parsed message
+        """
+        if room.state != ROOM_STATE_SELF_PRESENCE:
+            log.warning(_(
+                "received history in unexpected state in room {room} (state: "
+                "{state})").format(room = room.roomJID.userhost(),
+                                    state = room.state))
+            if not hasattr(room, "_history_d"):
+                # XXX: this hack is due to buggy behaviour seen in the wild because of the
+                #      "mod_delay" prosody module being activated. This module add an
+                #      unexpected <delay> elements which break our workflow.
+                log.warning(_("storing the unexpected message anyway, to avoid loss"))
+                # we have to restore URI which are stripped by wokkel parsing
+                for c in message.element.elements():
+                    if c.uri is None:
+                        c.uri = C.NS_CLIENT
+                mess_data = self.client.messageProt.parse_message(message.element)
+                message.element._mess_data = mess_data
+                self._add_to_history(None, user, message)
+                if mess_data['message'] or mess_data['subject']:
+                    self.host.bridge.message_new(
+                        *self.client.message_get_bridge_args(mess_data),
+                        profile=self.client.profile
+                    )
+                return
+        room._history_d.addCallback(self._add_to_history, user, message)
+        room._history_d.addErrback(self._add_to_history_eb)
+
+    ## subject ##
+
+    def groupChatReceived(self, message):
+        """
+        A group chat message has been received from a MUC room.
+
+        There are a few event methods that may get called here.
+        L{receivedGroupChat}, L{receivedSubject} or L{receivedHistory}.
+        """
+        # We override this method to fix subject handling (empty strings were discarded)
+        # FIXME: remove this once fixed upstream
+        room, user = self._getRoomUser(message)
+
+        if room is None:
+            log.warning("No room found for message: {message}"
+                        .format(message=message.toElement().toXml()))
+            return
+
+        if message.subject is not None:
+            self.receivedSubject(room, user, message.subject)
+        elif message.delay is None:
+            self.receivedGroupChat(room, user, message)
+        else:
+            self.receivedHistory(room, user, message)
+
+    def subject(self, room, subject):
+        return muc.MUCClientProtocol.subject(self, room, subject)
+
+    def _history_cb(self, __, room):
+        """Called when history have been written to database and subject is received
+
+        this method will finish joining by:
+            - sending message to bridge
+            - calling fully_joined deferred (for legacy history)
+            - sending stanza put in cache
+            - cleaning variables not needed anymore
+        """
+        args = self.plugin_parent._get_room_joined_args(room, self.client.profile)
+        self.host.bridge.muc_room_joined(*args)
+        if room._history_type == HISTORY_LEGACY:
+            room.fully_joined.callback(room)
+        del room._history_d
+        del room._history_type
+        cache = room._cache
+        del room._cache
+        cache_presence = room._cache_presence
+        del room._cache_presence
+        for elem in cache:
+            self.client.xmlstream.dispatch(elem)
+        for presence_data in cache_presence.values():
+            if not presence_data['show'] and not presence_data['status']:
+                # occupants are already sent in muc_room_joined, so if we don't have
+                # extra information like show or statuses, we can discard the signal
+                continue
+            else:
+                self.userUpdatedStatus(**presence_data)
+
+    def _history_eb(self, failure_, room):
+        log.error("Error while managing history: {}".format(failure_))
+        self._history_cb(None, room)
+
+    def receivedSubject(self, room, user, subject):
+        # when subject is received, we know that we have whole roster and history
+        # cf. http://xmpp.org/extensions/xep-0045.html#enter-subject
+        room.subject = subject  # FIXME: subject doesn't handle xml:lang
+        if room.state != ROOM_STATE_LIVE:
+            if room._history_type == HISTORY_LEGACY:
+                self.change_room_state(room, ROOM_STATE_LIVE)
+                room._history_d.addCallbacks(self._history_cb, self._history_eb, [room], errbackArgs=[room])
+        else:
+            # the subject has been changed
+            log.debug(_("New subject for room ({room_id}): {subject}").format(room_id = room.roomJID.full(), subject = subject))
+            self.host.bridge.muc_room_new_subject(room.roomJID.userhost(), subject, self.client.profile)
+
+    ## disco ##
+
+    def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
+        return [disco.DiscoFeature(NS_MUC)]
+
+    def getDiscoItems(self, requestor, target, nodeIdentifier=''):
+        # TODO: manage room queries ? Bad for privacy, must be disabled by default
+        #       see XEP-0045 § 6.7
+        return []