Reference Matrix Home Server

1 files changed, 808 insertions, 0 deletions

diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
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+++ b/synapse/handlers/room.py
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+# -*- coding: utf-8 -*-
+# Copyright 2014 matrix.org
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Contains functions for performing events on rooms."""
+from twisted.internet import defer
+
+from synapse.types import UserID, RoomAlias, RoomID
+from synapse.api.constants import Membership
+from synapse.api.errors import RoomError, StoreError, SynapseError
+from synapse.api.events.room import (
+    RoomTopicEvent, MessageEvent, InviteJoinEvent, RoomMemberEvent,
+    RoomConfigEvent
+)
+from synapse.api.streams.event import EventStream, MessagesStreamData
+from synapse.util import stringutils
+from ._base import BaseHandler
+
+import logging
+import json
+
+logger = logging.getLogger(__name__)
+
+
+class MessageHandler(BaseHandler):
+
+    def __init__(self, hs):
+        super(MessageHandler, self).__init__(hs)
+        self.hs = hs
+        self.clock = hs.get_clock()
+        self.event_factory = hs.get_event_factory()
+
+    @defer.inlineCallbacks
+    def get_message(self, msg_id=None, room_id=None, sender_id=None,
+                    user_id=None):
+        """ Retrieve a message.
+
+        Args:
+            msg_id (str): The message ID to obtain.
+            room_id (str): The room where the message resides.
+            sender_id (str): The user ID of the user who sent the message.
+            user_id (str): The user ID of the user making this request.
+        Returns:
+            The message, or None if no message exists.
+        Raises:
+            SynapseError if something went wrong.
+        """
+        yield self.auth.check_joined_room(room_id, user_id)
+
+        # Pull out the message from the db
+        msg = yield self.store.get_message(room_id=room_id,
+                                           msg_id=msg_id,
+                                           user_id=sender_id)
+
+        if msg:
+            defer.returnValue(msg)
+        defer.returnValue(None)
+
+    @defer.inlineCallbacks
+    def send_message(self, event=None, suppress_auth=False, stamp_event=True):
+        """ Send a message.
+
+        Args:
+            event : The message event to store.
+            suppress_auth (bool) : True to suppress auth for this message. This
+            is primarily so the home server can inject messages into rooms at
+            will.
+            stamp_event (bool) : True to stamp event content with server keys.
+        Raises:
+            SynapseError if something went wrong.
+        """
+        if stamp_event:
+            event.content["hsob_ts"] = int(self.clock.time_msec())
+
+        with (yield self.room_lock.lock(event.room_id)):
+            if not suppress_auth:
+                yield self.auth.check(event, raises=True)
+
+            # store message in db
+            store_id = yield self.store.persist_event(event)
+
+            event.destinations = yield self.store.get_joined_hosts_for_room(
+                event.room_id
+            )
+
+            yield self.hs.get_federation().handle_new_event(event)
+
+            self.notifier.on_new_room_event(event, store_id)
+
+    @defer.inlineCallbacks
+    def get_messages(self, user_id=None, room_id=None, pagin_config=None,
+                     feedback=False):
+        """Get messages in a room.
+
+        Args:
+            user_id (str): The user requesting messages.
+            room_id (str): The room they want messages from.
+            pagin_config (synapse.api.streams.PaginationConfig): The pagination
+            config rules to apply, if any.
+            feedback (bool): True to get compressed feedback with the messages
+        Returns:
+            dict: Pagination API results
+        """
+        yield self.auth.check_joined_room(room_id, user_id)
+
+        data_source = [MessagesStreamData(self.hs, room_id=room_id,
+                                          feedback=feedback)]
+        event_stream = EventStream(user_id, data_source)
+        pagin_config = yield event_stream.fix_tokens(pagin_config)
+        data_chunk = yield event_stream.get_chunk(config=pagin_config)
+        defer.returnValue(data_chunk)
+
+    @defer.inlineCallbacks
+    def store_room_data(self, event=None, stamp_event=True):
+        """ Stores data for a room.
+
+        Args:
+            event : The room path event
+            stamp_event (bool) : True to stamp event content with server keys.
+        Raises:
+            SynapseError if something went wrong.
+        """
+
+        with (yield self.room_lock.lock(event.room_id)):
+            yield self.auth.check(event, raises=True)
+
+            if stamp_event:
+                event.content["hsob_ts"] = int(self.clock.time_msec())
+
+            yield self.state_handler.handle_new_event(event)
+
+            # store in db
+            store_id = yield self.store.store_room_data(
+                room_id=event.room_id,
+                etype=event.type,
+                state_key=event.state_key,
+                content=json.dumps(event.content)
+            )
+
+            event.destinations = yield self.store.get_joined_hosts_for_room(
+                event.room_id
+            )
+            self.notifier.on_new_room_event(event, store_id)
+
+        yield self.hs.get_federation().handle_new_event(event)
+
+    @defer.inlineCallbacks
+    def get_room_data(self, user_id=None, room_id=None,
+                      event_type=None, state_key="",
+                      public_room_rules=[],
+                      private_room_rules=["join"]):
+        """ Get data from a room.
+
+        Args:
+            event : The room path event
+            public_room_rules : A list of membership states the user can be in,
+            in order to read this data IN A PUBLIC ROOM. An empty list means
+            'any state'.
+            private_room_rules : A list of membership states the user can be
+            in, in order to read this data IN A PRIVATE ROOM. An empty list
+            means 'any state'.
+        Returns:
+            The path data content.
+        Raises:
+            SynapseError if something went wrong.
+        """
+        if event_type == RoomTopicEvent.TYPE:
+            # anyone invited/joined can read the topic
+            private_room_rules = ["invite", "join"]
+
+        # does this room exist
+        room = yield self.store.get_room(room_id)
+        if not room:
+            raise RoomError(403, "Room does not exist.")
+
+        # does this user exist in this room
+        member = yield self.store.get_room_member(
+            room_id=room_id,
+            user_id="" if not user_id else user_id)
+
+        member_state = member.membership if member else None
+
+        if room.is_public and public_room_rules:
+            # make sure the user meets public room rules
+            if member_state not in public_room_rules:
+                raise RoomError(403, "Member does not meet public room rules.")
+        elif not room.is_public and private_room_rules:
+            # make sure the user meets private room rules
+            if member_state not in private_room_rules:
+                raise RoomError(
+                    403, "Member does not meet private room rules.")
+
+        data = yield self.store.get_room_data(room_id, event_type, state_key)
+        defer.returnValue(data)
+
+    @defer.inlineCallbacks
+    def get_feedback(self, room_id=None, msg_sender_id=None, msg_id=None,
+                     user_id=None, fb_sender_id=None, fb_type=None):
+        yield self.auth.check_joined_room(room_id, user_id)
+
+        # Pull out the feedback from the db
+        fb = yield self.store.get_feedback(
+            room_id=room_id, msg_id=msg_id, msg_sender_id=msg_sender_id,
+            fb_sender_id=fb_sender_id, fb_type=fb_type
+        )
+
+        if fb:
+            defer.returnValue(fb)
+        defer.returnValue(None)
+
+    @defer.inlineCallbacks
+    def send_feedback(self, event, stamp_event=True):
+        if stamp_event:
+            event.content["hsob_ts"] = int(self.clock.time_msec())
+
+        with (yield self.room_lock.lock(event.room_id)):
+            yield self.auth.check(event, raises=True)
+
+            # store message in db
+            store_id = yield self.store.persist_event(event)
+
+            event.destinations = yield self.store.get_joined_hosts_for_room(
+                event.room_id
+            )
+        yield self.hs.get_federation().handle_new_event(event)
+
+        self.notifier.on_new_room_event(event, store_id)
+
+    @defer.inlineCallbacks
+    def snapshot_all_rooms(self, user_id=None, pagin_config=None,
+                           feedback=False):
+        """Retrieve a snapshot of all rooms the user is invited or has joined.
+
+        This snapshot may include messages for all rooms where the user is
+        joined, depending on the pagination config.
+
+        Args:
+            user_id (str): The ID of the user making the request.
+            pagin_config (synapse.api.streams.PaginationConfig): The pagination
+            config used to determine how many messages *PER ROOM* to return.
+            feedback (bool): True to get feedback along with these messages.
+        Returns:
+            A list of dicts with "room_id" and "membership" keys for all rooms
+            the user is currently invited or joined in on. Rooms where the user
+            is joined on, may return a "messages" key with messages, depending
+            on the specified PaginationConfig.
+        """
+        room_list = yield self.store.get_rooms_for_user_where_membership_is(
+            user_id=user_id,
+            membership_list=[Membership.INVITE, Membership.JOIN]
+        )
+        for room_info in room_list:
+            if room_info["membership"] != Membership.JOIN:
+                continue
+            try:
+                event_chunk = yield self.get_messages(
+                    user_id=user_id,
+                    pagin_config=pagin_config,
+                    feedback=feedback,
+                    room_id=room_info["room_id"]
+                )
+                room_info["messages"] = event_chunk
+            except:
+                pass
+        defer.returnValue(room_list)
+
+
+class RoomCreationHandler(BaseHandler):
+
+    @defer.inlineCallbacks
+    def create_room(self, user_id, room_id, config):
+        """ Creates a new room.
+
+        Args:
+            user_id (str): The ID of the user creating the new room.
+            room_id (str): The proposed ID for the new room. Can be None, in
+            which case one will be created for you.
+            config (dict) : A dict of configuration options.
+        Returns:
+            The new room ID.
+        Raises:
+            SynapseError if the room ID was taken, couldn't be stored, or
+            something went horribly wrong.
+        """
+
+        if "room_alias_name" in config:
+            room_alias = RoomAlias.create_local(
+                config["room_alias_name"],
+                self.hs
+            )
+            mapping = yield self.store.get_association_from_room_alias(
+                room_alias
+            )
+
+            if mapping:
+                raise SynapseError(400, "Room alias already taken")
+        else:
+            room_alias = None
+
+        if room_id:
+            # Ensure room_id is the correct type
+            room_id_obj = RoomID.from_string(room_id, self.hs)
+            if not room_id_obj.is_mine:
+                raise SynapseError(400, "Room id must be local")
+
+            yield self.store.store_room(
+                room_id=room_id,
+                room_creator_user_id=user_id,
+                is_public=config["visibility"] == "public"
+            )
+        else:
+            # autogen room IDs and try to create it. We may clash, so just
+            # try a few times till one goes through, giving up eventually.
+            attempts = 0
+            room_id = None
+            while attempts < 5:
+                try:
+                    random_string = stringutils.random_string(18)
+                    gen_room_id = RoomID.create_local(random_string, self.hs)
+                    yield self.store.store_room(
+                        room_id=gen_room_id.to_string(),
+                        room_creator_user_id=user_id,
+                        is_public=config["visibility"] == "public"
+                    )
+                    room_id = gen_room_id.to_string()
+                    break
+                except StoreError:
+                    attempts += 1
+            if not room_id:
+                raise StoreError(500, "Couldn't generate a room ID.")
+
+        config_event = self.event_factory.create_event(
+            etype=RoomConfigEvent.TYPE,
+            room_id=room_id,
+            user_id=user_id,
+            content=config,
+        )
+
+        if room_alias:
+            yield self.store.create_room_alias_association(
+                room_id=room_id,
+                room_alias=room_alias,
+                servers=[self.hs.hostname],
+            )
+
+        yield self.state_handler.handle_new_event(config_event)
+        # store_id = persist...
+
+        yield self.hs.get_federation().handle_new_event(config_event)
+        # self.notifier.on_new_room_event(event, store_id)
+
+        content = {"membership": Membership.JOIN}
+        join_event = self.event_factory.create_event(
+            etype=RoomMemberEvent.TYPE,
+            target_user_id=user_id,
+            room_id=room_id,
+            user_id=user_id,
+            membership=Membership.JOIN,
+            content=content
+        )
+
+        yield self.hs.get_handlers().room_member_handler.change_membership(
+            join_event,
+            broadcast_msg=True,
+            do_auth=False
+        )
+
+        result = {"room_id": room_id}
+        if room_alias:
+            result["room_alias"] = room_alias.to_string()
+
+        defer.returnValue(result)
+
+
+class RoomMemberHandler(BaseHandler):
+    # TODO(paul): This handler currently contains a messy conflation of
+    #   low-level API that works on UserID objects and so on, and REST-level
+    #   API that takes ID strings and returns pagination chunks. These concerns
+    #   ought to be separated out a lot better.
+
+    def __init__(self, hs):
+        super(RoomMemberHandler, self).__init__(hs)
+
+        self.clock = hs.get_clock()
+
+        self.distributor = hs.get_distributor()
+        self.distributor.declare("user_joined_room")
+
+    @defer.inlineCallbacks
+    def get_room_members(self, room_id, membership=Membership.JOIN):
+        hs = self.hs
+
+        memberships = yield self.store.get_room_members(
+            room_id=room_id, membership=membership
+        )
+
+        defer.returnValue([hs.parse_userid(m.user_id) for m in memberships])
+
+    @defer.inlineCallbacks
+    def fetch_room_distributions_into(self, room_id, localusers=None,
+                                      remotedomains=None, ignore_user=None):
+        """Fetch the distribution of a room, adding elements to either
+        'localusers' or 'remotedomains', which should be a set() if supplied.
+        If ignore_user is set, ignore that user.
+
+        This function returns nothing; its result is performed by the
+        side-effect on the two passed sets. This allows easy accumulation of
+        member lists of multiple rooms at once if required.
+        """
+        members = yield self.get_room_members(room_id)
+        for member in members:
+            if ignore_user is not None and member == ignore_user:
+                continue
+
+            if member.is_mine:
+                if localusers is not None:
+                    localusers.add(member)
+            else:
+                if remotedomains is not None:
+                    remotedomains.add(member.domain)
+
+    @defer.inlineCallbacks
+    def get_room_members_as_pagination_chunk(self, room_id=None, user_id=None,
+                                             limit=0, start_tok=None,
+                                             end_tok=None):
+        """Retrieve a list of room members in the room.
+
+        Args:
+            room_id (str): The room to get the member list for.
+            user_id (str): The ID of the user making the request.
+            limit (int): The max number of members to return.
+            start_tok (str): Optional. The start token if known.
+            end_tok (str): Optional. The end token if known.
+        Returns:
+            dict: A Pagination streamable dict.
+        Raises:
+            SynapseError if something goes wrong.
+        """
+        yield self.auth.check_joined_room(room_id, user_id)
+
+        member_list = yield self.store.get_room_members(room_id=room_id)
+        event_list = [
+            entry.as_event(self.event_factory).get_dict()
+            for entry in member_list
+        ]
+        chunk_data = {
+            "start": "START",
+            "end": "END",
+            "chunk": event_list
+        }
+        # TODO honor Pagination stream params
+        # TODO snapshot this list to return on subsequent requests when
+        # paginating
+        defer.returnValue(chunk_data)
+
+    @defer.inlineCallbacks
+    def get_room_member(self, room_id, member_user_id, auth_user_id):
+        """Retrieve a room member from a room.
+
+        Args:
+            room_id : The room the member is in.
+            member_user_id : The member's user ID
+            auth_user_id : The user ID of the user making this request.
+        Returns:
+            The room member, or None if this member does not exist.
+        Raises:
+            SynapseError if something goes wrong.
+        """
+        yield self.auth.check_joined_room(room_id, auth_user_id)
+
+        member = yield self.store.get_room_member(user_id=member_user_id,
+                                                  room_id=room_id)
+        defer.returnValue(member)
+
+    @defer.inlineCallbacks
+    def change_membership(self, event=None, broadcast_msg=False, do_auth=True):
+        """ Change the membership status of a user in a room.
+
+        Args:
+            event (SynapseEvent): The membership event
+            broadcast_msg (bool): True to inject a membership message into this
+                room on success.
+        Raises:
+            SynapseError if there was a problem changing the membership.
+        """
+
+        #broadcast_msg = False
+
+        prev_state = yield self.store.get_room_member(
+            event.target_user_id, event.room_id
+        )
+
+        if prev_state and prev_state.membership == event.membership:
+            # treat this event as a NOOP.
+            if do_auth:  # This is mainly to fix a unit test.
+                yield self.auth.check(event, raises=True)
+            defer.returnValue({})
+            return
+
+        room_id = event.room_id
+
+        # If we're trying to join a room then we have to do this differently
+        # if this HS is not currently in the room, i.e. we have to do the
+        # invite/join dance.
+        if event.membership == Membership.JOIN:
+            yield self._do_join(
+                event, do_auth=do_auth, broadcast_msg=broadcast_msg
+            )
+        else:
+            # This is not a JOIN, so we can handle it normally.
+            if do_auth:
+                yield self.auth.check(event, raises=True)
+
+            prev_state = yield self.store.get_room_member(
+                event.target_user_id, event.room_id
+            )
+            if prev_state and prev_state.membership == event.membership:
+                # double same action, treat this event as a NOOP.
+                defer.returnValue({})
+                return
+
+            yield self.state_handler.handle_new_event(event)
+            yield self._do_local_membership_update(
+                event,
+                membership=event.content["membership"],
+                broadcast_msg=broadcast_msg,
+            )
+
+        defer.returnValue({"room_id": room_id})
+
+    @defer.inlineCallbacks
+    def join_room_alias(self, joinee, room_alias, do_auth=True, content={}):
+        directory_handler = self.hs.get_handlers().directory_handler
+        mapping = yield directory_handler.get_association(room_alias)
+
+        if not mapping:
+            raise SynapseError(404, "No such room alias")
+
+        room_id = mapping["room_id"]
+        hosts = mapping["servers"]
+        if not hosts:
+            raise SynapseError(404, "No known servers")
+
+        host = hosts[0]
+
+        content.update({"membership": Membership.JOIN})
+        new_event = self.event_factory.create_event(
+            etype=RoomMemberEvent.TYPE,
+            target_user_id=joinee.to_string(),
+            room_id=room_id,
+            user_id=joinee.to_string(),
+            membership=Membership.JOIN,
+            content=content,
+        )
+
+        yield self._do_join(new_event, room_host=host, do_auth=True)
+
+        defer.returnValue({"room_id": room_id})
+
+    @defer.inlineCallbacks
+    def _do_join(self, event, room_host=None, do_auth=True, broadcast_msg=True):
+        joinee = self.hs.parse_userid(event.target_user_id)
+        # room_id = RoomID.from_string(event.room_id, self.hs)
+        room_id = event.room_id
+
+        # If event doesn't include a display name, add one.
+        yield self._fill_out_join_content(
+            joinee, event.content
+        )
+
+        # XXX: We don't do an auth check if we are doing an invite
+        # join dance for now, since we're kinda implicitly checking
+        # that we are allowed to join when we decide whether or not we
+        # need to do the invite/join dance.
+
+        room = yield self.store.get_room(room_id)
+
+        if room:
+            should_do_dance = False
+        elif room_host:
+            should_do_dance = True
+        else:
+            prev_state = yield self.store.get_room_member(
+                joinee.to_string(), room_id
+            )
+
+            if prev_state and prev_state.membership == Membership.INVITE:
+                room = yield self.store.get_room(room_id)
+                inviter = UserID.from_string(
+                    prev_state.sender, self.hs
+                )
+
+                should_do_dance = not inviter.is_mine and not room
+                room_host = inviter.domain
+            else:
+                should_do_dance = False
+
+        # We want to do the _do_update inside the room lock.
+        if not should_do_dance:
+            logger.debug("Doing normal join")
+
+            if do_auth:
+                yield self.auth.check(event, raises=True)
+
+            yield self.state_handler.handle_new_event(event)
+            yield self._do_local_membership_update(
+                event,
+                membership=event.content["membership"],
+                broadcast_msg=broadcast_msg,
+            )
+
+
+        if should_do_dance:
+            yield self._do_invite_join_dance(
+                room_id=room_id,
+                joinee=event.user_id,
+                target_host=room_host,
+                content=event.content,
+            )
+
+        user = self.hs.parse_userid(event.user_id)
+        self.distributor.fire(
+            "user_joined_room", user=user, room_id=room_id
+        )
+
+    @defer.inlineCallbacks
+    def _fill_out_join_content(self, user_id, content):
+        # If event doesn't include a display name, add one.
+        profile_handler = self.hs.get_handlers().profile_handler
+        if "displayname" not in content:
+            try:
+                display_name = yield profile_handler.get_displayname(
+                    user_id
+                )
+
+                if display_name:
+                    content["displayname"] = display_name
+            except:
+                logger.exception("Failed to set display_name")
+
+        if "avatar_url" not in content:
+            try:
+                avatar_url = yield profile_handler.get_avatar_url(
+                    user_id
+                )
+
+                if avatar_url:
+                    content["avatar_url"] = avatar_url
+            except:
+                logger.exception("Failed to set display_name")
+
+    @defer.inlineCallbacks
+    def _should_invite_join(self, room_id, prev_state, do_auth):
+        logger.debug("_should_invite_join: room_id: %s", room_id)
+
+        # XXX: We don't do an auth check if we are doing an invite
+        # join dance for now, since we're kinda implicitly checking
+        # that we are allowed to join when we decide whether or not we
+        # need to do the invite/join dance.
+
+        # Only do an invite join dance if a) we were invited,
+        # b) the person inviting was from a differnt HS and c) we are
+        # not currently in the room
+        room_host = None
+        if prev_state and prev_state.membership == Membership.INVITE:
+            room = yield self.store.get_room(room_id)
+            inviter = UserID.from_string(
+                prev_state.sender, self.hs
+            )
+
+            is_remote_invite_join = not inviter.is_mine and not room
+            room_host = inviter.domain
+        else:
+            is_remote_invite_join = False
+
+        defer.returnValue((is_remote_invite_join, room_host))
+
+    @defer.inlineCallbacks
+    def get_rooms_for_user(self, user, membership_list=[Membership.JOIN]):
+        """Returns a list of roomids that the user has any of the given
+        membership states in."""
+        rooms = yield self.store.get_rooms_for_user_where_membership_is(
+            user_id=user.to_string(), membership_list=membership_list
+        )
+
+        defer.returnValue([r["room_id"] for r in rooms])
+
+    @defer.inlineCallbacks
+    def _do_local_membership_update(self, event, membership, broadcast_msg):
+        # store membership
+        store_id = yield self.store.store_room_member(
+            user_id=event.target_user_id,
+            sender=event.user_id,
+            room_id=event.room_id,
+            content=event.content,
+            membership=membership
+        )
+
+        # Send a PDU to all hosts who have joined the room.
+        destinations = yield self.store.get_joined_hosts_for_room(
+            event.room_id
+        )
+
+        # If we're inviting someone, then we should also send it to that
+        # HS.
+        if membership == Membership.INVITE:
+            host = UserID.from_string(
+                event.target_user_id, self.hs
+            ).domain
+            destinations.append(host)
+
+        # If we are joining a remote HS, include that.
+        if membership == Membership.JOIN:
+            host = UserID.from_string(
+                event.target_user_id, self.hs
+            ).domain
+            destinations.append(host)
+
+        event.destinations = list(set(destinations))
+
+        yield self.hs.get_federation().handle_new_event(event)
+        self.notifier.on_new_room_event(event, store_id)
+
+        if broadcast_msg:
+            yield self._inject_membership_msg(
+                source=event.user_id,
+                target=event.target_user_id,
+                room_id=event.room_id,
+                membership=event.content["membership"]
+            )
+
+    @defer.inlineCallbacks
+    def _do_invite_join_dance(self, room_id, joinee, target_host, content):
+        logger.debug("Doing remote join dance")
+
+        # do invite join dance
+        federation = self.hs.get_federation()
+        new_event = self.event_factory.create_event(
+            etype=InviteJoinEvent.TYPE,
+            target_host=target_host,
+            room_id=room_id,
+            user_id=joinee,
+            content=content
+        )
+
+        new_event.destinations = [target_host]
+
+        yield self.store.store_room(
+            room_id, "", is_public=False
+        )
+
+        #yield self.state_handler.handle_new_event(event)
+        yield federation.handle_new_event(new_event)
+        yield federation.get_state_for_room(
+            target_host, room_id
+        )
+
+    @defer.inlineCallbacks
+    def _inject_membership_msg(self, room_id=None, source=None, target=None,
+                               membership=None):
+        # TODO this should be a different type of message, not m.text
+        if membership == Membership.INVITE:
+            body = "%s invited %s to the room." % (source, target)
+        elif membership == Membership.JOIN:
+            body = "%s joined the room." % (target)
+        elif membership == Membership.LEAVE:
+            body = "%s left the room." % (target)
+        else:
+            raise RoomError(500, "Unknown membership value %s" % membership)
+
+        membership_json = {
+            "msgtype": u"m.text",
+            "body": body,
+            "membership_source": source,
+            "membership_target": target,
+            "membership": membership,
+        }
+
+        msg_id = "m%s" % int(self.clock.time_msec())
+
+        event = self.event_factory.create_event(
+            etype=MessageEvent.TYPE,
+            room_id=room_id,
+            user_id="_homeserver_",
+            msg_id=msg_id,
+            content=membership_json
+        )
+
+        handler = self.hs.get_handlers().message_handler
+        yield handler.send_message(event, suppress_auth=True)
+
+
+class RoomListHandler(BaseHandler):
+
+    @defer.inlineCallbacks
+    def get_public_room_list(self):
+        chunk = yield self.store.get_rooms(is_public=True, with_topics=True)
+        defer.returnValue({"start": "START", "end": "END", "chunk": chunk})