예제 #1
0
    def test_rwlock(self):
        rwlock = ReadWriteLock()

        key = object()

        ds = [
            rwlock.read(key),  # 0
            rwlock.read(key),  # 1
            rwlock.write(key),  # 2
            rwlock.write(key),  # 3
            rwlock.read(key),  # 4
            rwlock.read(key),  # 5
            rwlock.write(key),  # 6
        ]

        self._assert_called_before_not_after(ds, 2)

        with ds[0].result:
            self._assert_called_before_not_after(ds, 2)
        self._assert_called_before_not_after(ds, 2)

        with ds[1].result:
            self._assert_called_before_not_after(ds, 2)
        self._assert_called_before_not_after(ds, 3)

        with ds[2].result:
            self._assert_called_before_not_after(ds, 3)
        self._assert_called_before_not_after(ds, 4)

        with ds[3].result:
            self._assert_called_before_not_after(ds, 4)
        self._assert_called_before_not_after(ds, 6)

        with ds[5].result:
            self._assert_called_before_not_after(ds, 6)
        self._assert_called_before_not_after(ds, 6)

        with ds[4].result:
            self._assert_called_before_not_after(ds, 6)
        self._assert_called_before_not_after(ds, 7)

        with ds[6].result:
            pass

        d = rwlock.write(key)
        self.assertTrue(d.called)
        with d.result:
            pass

        d = rwlock.read(key)
        self.assertTrue(d.called)
        with d.result:
            pass
예제 #2
0
    def test_rwlock(self):
        rwlock = ReadWriteLock()

        key = object()

        ds = [
            rwlock.read(key),   # 0
            rwlock.read(key),   # 1
            rwlock.write(key),  # 2
            rwlock.write(key),  # 3
            rwlock.read(key),   # 4
            rwlock.read(key),   # 5
            rwlock.write(key),  # 6
        ]

        self._assert_called_before_not_after(ds, 2)

        with ds[0].result:
            self._assert_called_before_not_after(ds, 2)
        self._assert_called_before_not_after(ds, 2)

        with ds[1].result:
            self._assert_called_before_not_after(ds, 2)
        self._assert_called_before_not_after(ds, 3)

        with ds[2].result:
            self._assert_called_before_not_after(ds, 3)
        self._assert_called_before_not_after(ds, 4)

        with ds[3].result:
            self._assert_called_before_not_after(ds, 4)
        self._assert_called_before_not_after(ds, 6)

        with ds[5].result:
            self._assert_called_before_not_after(ds, 6)
        self._assert_called_before_not_after(ds, 6)

        with ds[4].result:
            self._assert_called_before_not_after(ds, 6)
        self._assert_called_before_not_after(ds, 7)

        with ds[6].result:
            pass

        d = rwlock.write(key)
        self.assertTrue(d.called)
        with d.result:
            pass

        d = rwlock.read(key)
        self.assertTrue(d.called)
        with d.result:
            pass
예제 #3
0
class MessageHandler(BaseHandler):
    def __init__(self, hs):
        super(MessageHandler, self).__init__(hs)
        self.hs = hs
        self.state = hs.get_state_handler()
        self.clock = hs.get_clock()

        self.pagination_lock = ReadWriteLock()
        self._purges_in_progress_by_room = set()
        # map from purge id to PurgeStatus
        self._purges_by_id = {}

    def start_purge_history(self,
                            room_id,
                            topological_ordering,
                            delete_local_events=False):
        """Start off a history purge on a room.

        Args:
            room_id (str): The room to purge from

            topological_ordering (int): minimum topo ordering to preserve
            delete_local_events (bool): True to delete local events as well as
                remote ones

        Returns:
            str: unique ID for this purge transaction.
        """
        if room_id in self._purges_in_progress_by_room:
            raise SynapseError(
                400,
                "History purge already in progress for %s" % (room_id, ),
            )

        purge_id = random_string(16)

        # we log the purge_id here so that it can be tied back to the
        # request id in the log lines.
        logger.info("[purge] starting purge_id %s", purge_id)

        self._purges_by_id[purge_id] = PurgeStatus()
        run_in_background(
            self._purge_history,
            purge_id,
            room_id,
            topological_ordering,
            delete_local_events,
        )
        return purge_id

    @defer.inlineCallbacks
    def _purge_history(self, purge_id, room_id, topological_ordering,
                       delete_local_events):
        """Carry out a history purge on a room.

        Args:
            purge_id (str): The id for this purge
            room_id (str): The room to purge from
            topological_ordering (int): minimum topo ordering to preserve
            delete_local_events (bool): True to delete local events as well as
                remote ones

        Returns:
            Deferred
        """
        self._purges_in_progress_by_room.add(room_id)
        try:
            with (yield self.pagination_lock.write(room_id)):
                yield self.store.purge_history(
                    room_id,
                    topological_ordering,
                    delete_local_events,
                )
            logger.info("[purge] complete")
            self._purges_by_id[purge_id].status = PurgeStatus.STATUS_COMPLETE
        except Exception:
            logger.error("[purge] failed: %s",
                         Failure().getTraceback().rstrip())
            self._purges_by_id[purge_id].status = PurgeStatus.STATUS_FAILED
        finally:
            self._purges_in_progress_by_room.discard(room_id)

            # remove the purge from the list 24 hours after it completes
            def clear_purge():
                del self._purges_by_id[purge_id]

            reactor.callLater(24 * 3600, clear_purge)

    def get_purge_status(self, purge_id):
        """Get the current status of an active purge

        Args:
            purge_id (str): purge_id returned by start_purge_history

        Returns:
            PurgeStatus|None
        """
        return self._purges_by_id.get(purge_id)

    @defer.inlineCallbacks
    def get_messages(self,
                     requester,
                     room_id=None,
                     pagin_config=None,
                     as_client_event=True,
                     event_filter=None):
        """Get messages in a room.

        Args:
            requester (Requester): 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.
            as_client_event (bool): True to get events in client-server format.
            event_filter (Filter): Filter to apply to results or None
        Returns:
            dict: Pagination API results
        """
        user_id = requester.user.to_string()

        if pagin_config.from_token:
            room_token = pagin_config.from_token.room_key
        else:
            pagin_config.from_token = (
                yield self.hs.get_event_sources().get_current_token_for_room(
                    room_id=room_id))
            room_token = pagin_config.from_token.room_key

        room_token = RoomStreamToken.parse(room_token)

        pagin_config.from_token = pagin_config.from_token.copy_and_replace(
            "room_key", str(room_token))

        source_config = pagin_config.get_source_config("room")

        with (yield self.pagination_lock.read(room_id)):
            membership, member_event_id = yield self._check_in_room_or_world_readable(
                room_id, user_id)

            if source_config.direction == 'b':
                # if we're going backwards, we might need to backfill. This
                # requires that we have a topo token.
                if room_token.topological:
                    max_topo = room_token.topological
                else:
                    max_topo = yield self.store.get_max_topological_token(
                        room_id, room_token.stream)

                if membership == Membership.LEAVE:
                    # If they have left the room then clamp the token to be before
                    # they left the room, to save the effort of loading from the
                    # database.
                    leave_token = yield self.store.get_topological_token_for_event(
                        member_event_id)
                    leave_token = RoomStreamToken.parse(leave_token)
                    if leave_token.topological < max_topo:
                        source_config.from_key = str(leave_token)

                yield self.hs.get_handlers().federation_handler.maybe_backfill(
                    room_id, max_topo)

            events, next_key = yield self.store.paginate_room_events(
                room_id=room_id,
                from_key=source_config.from_key,
                to_key=source_config.to_key,
                direction=source_config.direction,
                limit=source_config.limit,
                event_filter=event_filter,
            )

            next_token = pagin_config.from_token.copy_and_replace(
                "room_key", next_key)

        if not events:
            defer.returnValue({
                "chunk": [],
                "start": pagin_config.from_token.to_string(),
                "end": next_token.to_string(),
            })

        if event_filter:
            events = event_filter.filter(events)

        events = yield filter_events_for_client(
            self.store,
            user_id,
            events,
            is_peeking=(member_event_id is None),
        )

        time_now = self.clock.time_msec()

        chunk = {
            "chunk":
            [serialize_event(e, time_now, as_client_event) for e in events],
            "start":
            pagin_config.from_token.to_string(),
            "end":
            next_token.to_string(),
        }

        defer.returnValue(chunk)

    @defer.inlineCallbacks
    def get_room_data(self,
                      user_id=None,
                      room_id=None,
                      event_type=None,
                      state_key="",
                      is_guest=False):
        """ Get data from a room.

        Args:
            event : The room path event
        Returns:
            The path data content.
        Raises:
            SynapseError if something went wrong.
        """
        membership, membership_event_id = yield self._check_in_room_or_world_readable(
            room_id, user_id)

        if membership == Membership.JOIN:
            data = yield self.state_handler.get_current_state(
                room_id, event_type, state_key)
        elif membership == Membership.LEAVE:
            key = (event_type, state_key)
            room_state = yield self.store.get_state_for_events(
                [membership_event_id], [key])
            data = room_state[membership_event_id].get(key)

        defer.returnValue(data)

    @defer.inlineCallbacks
    def _check_in_room_or_world_readable(self, room_id, user_id):
        try:
            # check_user_was_in_room will return the most recent membership
            # event for the user if:
            #  * The user is a non-guest user, and was ever in the room
            #  * The user is a guest user, and has joined the room
            # else it will throw.
            member_event = yield self.auth.check_user_was_in_room(
                room_id, user_id)
            defer.returnValue((member_event.membership, member_event.event_id))
            return
        except AuthError:
            visibility = yield self.state_handler.get_current_state(
                room_id, EventTypes.RoomHistoryVisibility, "")
            if (visibility and visibility.content["history_visibility"]
                    == "world_readable"):
                defer.returnValue((Membership.JOIN, None))
                return
            raise AuthError(403,
                            "Guest access not allowed",
                            errcode=Codes.GUEST_ACCESS_FORBIDDEN)

    @defer.inlineCallbacks
    def get_state_events(self, user_id, room_id, is_guest=False):
        """Retrieve all state events for a given room. If the user is
        joined to the room then return the current state. If the user has
        left the room return the state events from when they left.

        Args:
            user_id(str): The user requesting state events.
            room_id(str): The room ID to get all state events from.
        Returns:
            A list of dicts representing state events. [{}, {}, {}]
        """
        membership, membership_event_id = yield self._check_in_room_or_world_readable(
            room_id, user_id)

        if membership == Membership.JOIN:
            room_state = yield self.state_handler.get_current_state(room_id)
        elif membership == Membership.LEAVE:
            room_state = yield self.store.get_state_for_events(
                [membership_event_id], None)
            room_state = room_state[membership_event_id]

        now = self.clock.time_msec()
        defer.returnValue(
            [serialize_event(c, now) for c in room_state.values()])

    @defer.inlineCallbacks
    def get_joined_members(self, requester, room_id):
        """Get all the joined members in the room and their profile information.

        If the user has left the room return the state events from when they left.

        Args:
            requester(Requester): The user requesting state events.
            room_id(str): The room ID to get all state events from.
        Returns:
            A dict of user_id to profile info
        """
        user_id = requester.user.to_string()
        if not requester.app_service:
            # We check AS auth after fetching the room membership, as it
            # requires us to pull out all joined members anyway.
            membership, _ = yield self._check_in_room_or_world_readable(
                room_id, user_id)
            if membership != Membership.JOIN:
                raise NotImplementedError(
                    "Getting joined members after leaving is not implemented")

        users_with_profile = yield self.state.get_current_user_in_room(room_id)

        # If this is an AS, double check that they are allowed to see the members.
        # This can either be because the AS user is in the room or becuase there
        # is a user in the room that the AS is "interested in"
        if requester.app_service and user_id not in users_with_profile:
            for uid in users_with_profile:
                if requester.app_service.is_interested_in_user(uid):
                    break
            else:
                # Loop fell through, AS has no interested users in room
                raise AuthError(403, "Appservice not in room")

        defer.returnValue({
            user_id: {
                "avatar_url": profile.avatar_url,
                "display_name": profile.display_name,
            }
            for user_id, profile in users_with_profile.iteritems()
        })
예제 #4
0
class MessageHandler(BaseHandler):
    def __init__(self, hs):
        super(MessageHandler, self).__init__(hs)
        self.hs = hs
        self.state = hs.get_state_handler()
        self.clock = hs.get_clock()
        self.validator = EventValidator()

        self.pagination_lock = ReadWriteLock()

        # We arbitrarily limit concurrent event creation for a room to 5.
        # This is to stop us from diverging history *too* much.
        self.limiter = Limiter(max_count=5)

    @defer.inlineCallbacks
    def purge_history(self, room_id, event_id):
        event = yield self.store.get_event(event_id)

        if event.room_id != room_id:
            raise SynapseError(400, "Event is for wrong room.")

        depth = event.depth

        with (yield self.pagination_lock.write(room_id)):
            yield self.store.delete_old_state(room_id, depth)

    @defer.inlineCallbacks
    def get_messages(self,
                     requester,
                     room_id=None,
                     pagin_config=None,
                     as_client_event=True,
                     event_filter=None):
        """Get messages in a room.

        Args:
            requester (Requester): 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.
            as_client_event (bool): True to get events in client-server format.
            event_filter (Filter): Filter to apply to results or None
        Returns:
            dict: Pagination API results
        """
        user_id = requester.user.to_string()

        if pagin_config.from_token:
            room_token = pagin_config.from_token.room_key
        else:
            pagin_config.from_token = (
                yield self.hs.get_event_sources().get_current_token_for_room(
                    room_id=room_id))
            room_token = pagin_config.from_token.room_key

        room_token = RoomStreamToken.parse(room_token)

        pagin_config.from_token = pagin_config.from_token.copy_and_replace(
            "room_key", str(room_token))

        source_config = pagin_config.get_source_config("room")

        with (yield self.pagination_lock.read(room_id)):
            membership, member_event_id = yield self._check_in_room_or_world_readable(
                room_id, user_id)

            if source_config.direction == 'b':
                # if we're going backwards, we might need to backfill. This
                # requires that we have a topo token.
                if room_token.topological:
                    max_topo = room_token.topological
                else:
                    max_topo = yield self.store.get_max_topological_token(
                        room_id, room_token.stream)

                if membership == Membership.LEAVE:
                    # If they have left the room then clamp the token to be before
                    # they left the room, to save the effort of loading from the
                    # database.
                    leave_token = yield self.store.get_topological_token_for_event(
                        member_event_id)
                    leave_token = RoomStreamToken.parse(leave_token)
                    if leave_token.topological < max_topo:
                        source_config.from_key = str(leave_token)

                yield self.hs.get_handlers().federation_handler.maybe_backfill(
                    room_id, max_topo)

            events, next_key = yield self.store.paginate_room_events(
                room_id=room_id,
                from_key=source_config.from_key,
                to_key=source_config.to_key,
                direction=source_config.direction,
                limit=source_config.limit,
                event_filter=event_filter,
            )

            next_token = pagin_config.from_token.copy_and_replace(
                "room_key", next_key)

        if not events:
            defer.returnValue({
                "chunk": [],
                "start": pagin_config.from_token.to_string(),
                "end": next_token.to_string(),
            })

        if event_filter:
            events = event_filter.filter(events)

        events = yield filter_events_for_client(
            self.store,
            user_id,
            events,
            is_peeking=(member_event_id is None),
        )

        time_now = self.clock.time_msec()

        chunk = {
            "chunk":
            [serialize_event(e, time_now, as_client_event) for e in events],
            "start":
            pagin_config.from_token.to_string(),
            "end":
            next_token.to_string(),
        }

        defer.returnValue(chunk)

    @defer.inlineCallbacks
    def create_event(self,
                     event_dict,
                     token_id=None,
                     txn_id=None,
                     prev_event_ids=None):
        """
        Given a dict from a client, create a new event.

        Creates an FrozenEvent object, filling out auth_events, prev_events,
        etc.

        Adds display names to Join membership events.

        Args:
            event_dict (dict): An entire event
            token_id (str)
            txn_id (str)
            prev_event_ids (list): The prev event ids to use when creating the event

        Returns:
            Tuple of created event (FrozenEvent), Context
        """
        builder = self.event_builder_factory.new(event_dict)

        with (yield self.limiter.queue(builder.room_id)):
            self.validator.validate_new(builder)

            if builder.type == EventTypes.Member:
                membership = builder.content.get("membership", None)
                target = UserID.from_string(builder.state_key)

                if membership in {Membership.JOIN, Membership.INVITE}:
                    # If event doesn't include a display name, add one.
                    profile = self.hs.get_handlers().profile_handler
                    content = builder.content

                    try:
                        if "displayname" not in content:
                            content[
                                "displayname"] = yield profile.get_displayname(
                                    target)
                        if "avatar_url" not in content:
                            content[
                                "avatar_url"] = yield profile.get_avatar_url(
                                    target)
                    except Exception as e:
                        logger.info(
                            "Failed to get profile information for %r: %s",
                            target, e)

            if token_id is not None:
                builder.internal_metadata.token_id = token_id

            if txn_id is not None:
                builder.internal_metadata.txn_id = txn_id

            event, context = yield self._create_new_client_event(
                builder=builder,
                prev_event_ids=prev_event_ids,
            )

        defer.returnValue((event, context))

    @defer.inlineCallbacks
    def send_nonmember_event(self, requester, event, context, ratelimit=True):
        """
        Persists and notifies local clients and federation of an event.

        Args:
            event (FrozenEvent) the event to send.
            context (Context) the context of the event.
            ratelimit (bool): Whether to rate limit this send.
            is_guest (bool): Whether the sender is a guest.
        """
        if event.type == EventTypes.Member:
            raise SynapseError(
                500, "Tried to send member event through non-member codepath")

        # We check here if we are currently being rate limited, so that we
        # don't do unnecessary work. We check again just before we actually
        # send the event.
        time_now = self.clock.time()
        allowed, time_allowed = self.ratelimiter.send_message(
            event.sender,
            time_now,
            msg_rate_hz=self.hs.config.rc_messages_per_second,
            burst_count=self.hs.config.rc_message_burst_count,
            update=False,
        )
        if not allowed:
            raise LimitExceededError(retry_after_ms=int(
                1000 * (time_allowed - time_now)), )

        user = UserID.from_string(event.sender)

        assert self.hs.is_mine(user), "User must be our own: %s" % (user, )

        if event.is_state():
            prev_state = yield self.deduplicate_state_event(event, context)
            if prev_state is not None:
                defer.returnValue(prev_state)

        yield self.handle_new_client_event(
            requester=requester,
            event=event,
            context=context,
            ratelimit=ratelimit,
        )

        if event.type == EventTypes.Message:
            presence = self.hs.get_presence_handler()
            # We don't want to block sending messages on any presence code. This
            # matters as sometimes presence code can take a while.
            preserve_fn(presence.bump_presence_active_time)(user)

    @defer.inlineCallbacks
    def deduplicate_state_event(self, event, context):
        """
        Checks whether event is in the latest resolved state in context.

        If so, returns the version of the event in context.
        Otherwise, returns None.
        """
        prev_event_id = context.prev_state_ids.get(
            (event.type, event.state_key))
        prev_event = yield self.store.get_event(prev_event_id, allow_none=True)
        if not prev_event:
            return

        if prev_event and event.user_id == prev_event.user_id:
            prev_content = encode_canonical_json(prev_event.content)
            next_content = encode_canonical_json(event.content)
            if prev_content == next_content:
                defer.returnValue(prev_event)
        return

    @defer.inlineCallbacks
    def create_and_send_nonmember_event(self,
                                        requester,
                                        event_dict,
                                        ratelimit=True,
                                        txn_id=None):
        """
        Creates an event, then sends it.

        See self.create_event and self.send_nonmember_event.
        """
        event, context = yield self.create_event(
            event_dict, token_id=requester.access_token_id, txn_id=txn_id)
        yield self.send_nonmember_event(
            requester,
            event,
            context,
            ratelimit=ratelimit,
        )
        defer.returnValue(event)

    @defer.inlineCallbacks
    def get_room_data(self,
                      user_id=None,
                      room_id=None,
                      event_type=None,
                      state_key="",
                      is_guest=False):
        """ Get data from a room.

        Args:
            event : The room path event
        Returns:
            The path data content.
        Raises:
            SynapseError if something went wrong.
        """
        membership, membership_event_id = yield self._check_in_room_or_world_readable(
            room_id, user_id)

        if membership == Membership.JOIN:
            data = yield self.state_handler.get_current_state(
                room_id, event_type, state_key)
        elif membership == Membership.LEAVE:
            key = (event_type, state_key)
            room_state = yield self.store.get_state_for_events(
                [membership_event_id], [key])
            data = room_state[membership_event_id].get(key)

        defer.returnValue(data)

    @defer.inlineCallbacks
    def _check_in_room_or_world_readable(self, room_id, user_id):
        try:
            # check_user_was_in_room will return the most recent membership
            # event for the user if:
            #  * The user is a non-guest user, and was ever in the room
            #  * The user is a guest user, and has joined the room
            # else it will throw.
            member_event = yield self.auth.check_user_was_in_room(
                room_id, user_id)
            defer.returnValue((member_event.membership, member_event.event_id))
            return
        except AuthError:
            visibility = yield self.state_handler.get_current_state(
                room_id, EventTypes.RoomHistoryVisibility, "")
            if (visibility and visibility.content["history_visibility"]
                    == "world_readable"):
                defer.returnValue((Membership.JOIN, None))
                return
            raise AuthError(403,
                            "Guest access not allowed",
                            errcode=Codes.GUEST_ACCESS_FORBIDDEN)

    @defer.inlineCallbacks
    def get_state_events(self, user_id, room_id, is_guest=False):
        """Retrieve all state events for a given room. If the user is
        joined to the room then return the current state. If the user has
        left the room return the state events from when they left.

        Args:
            user_id(str): The user requesting state events.
            room_id(str): The room ID to get all state events from.
        Returns:
            A list of dicts representing state events. [{}, {}, {}]
        """
        membership, membership_event_id = yield self._check_in_room_or_world_readable(
            room_id, user_id)

        if membership == Membership.JOIN:
            room_state = yield self.state_handler.get_current_state(room_id)
        elif membership == Membership.LEAVE:
            room_state = yield self.store.get_state_for_events(
                [membership_event_id], None)
            room_state = room_state[membership_event_id]

        now = self.clock.time_msec()
        defer.returnValue(
            [serialize_event(c, now) for c in room_state.values()])

    @measure_func("_create_new_client_event")
    @defer.inlineCallbacks
    def _create_new_client_event(self, builder, prev_event_ids=None):
        if prev_event_ids:
            prev_events = yield self.store.add_event_hashes(prev_event_ids)
            prev_max_depth = yield self.store.get_max_depth_of_events(
                prev_event_ids)
            depth = prev_max_depth + 1
        else:
            latest_ret = yield self.store.get_latest_event_ids_and_hashes_in_room(
                builder.room_id, )

            # We want to limit the max number of prev events we point to in our
            # new event
            if len(latest_ret) > 10:
                # Sort by reverse depth, so we point to the most recent.
                latest_ret.sort(key=lambda a: -a[2])
                new_latest_ret = latest_ret[:5]

                # We also randomly point to some of the older events, to make
                # sure that we don't completely ignore the older events.
                if latest_ret[5:]:
                    sample_size = min(5, len(latest_ret[5:]))
                    new_latest_ret.extend(
                        random.sample(latest_ret[5:], sample_size))
                latest_ret = new_latest_ret

            if latest_ret:
                depth = max([d for _, _, d in latest_ret]) + 1
            else:
                depth = 1

            prev_events = [(event_id, prev_hashes)
                           for event_id, prev_hashes, _ in latest_ret]

        builder.prev_events = prev_events
        builder.depth = depth

        state_handler = self.state_handler

        context = yield state_handler.compute_event_context(builder)

        if builder.is_state():
            builder.prev_state = yield self.store.add_event_hashes(
                context.prev_state_events)

        yield self.auth.add_auth_events(builder, context)

        signing_key = self.hs.config.signing_key[0]
        add_hashes_and_signatures(builder, self.server_name, signing_key)

        event = builder.build()

        logger.debug(
            "Created event %s with state: %s",
            event.event_id,
            context.prev_state_ids,
        )

        defer.returnValue((
            event,
            context,
        ))

    @measure_func("handle_new_client_event")
    @defer.inlineCallbacks
    def handle_new_client_event(self,
                                requester,
                                event,
                                context,
                                ratelimit=True,
                                extra_users=[]):
        # We now need to go and hit out to wherever we need to hit out to.

        if ratelimit:
            self.ratelimit(requester)

        try:
            yield self.auth.check_from_context(event, context)
        except AuthError as err:
            logger.warn("Denying new event %r because %s", event, err)
            raise err

        yield self.maybe_kick_guest_users(event, context)

        if event.type == EventTypes.CanonicalAlias:
            # Check the alias is acually valid (at this time at least)
            room_alias_str = event.content.get("alias", None)
            if room_alias_str:
                room_alias = RoomAlias.from_string(room_alias_str)
                directory_handler = self.hs.get_handlers().directory_handler
                mapping = yield directory_handler.get_association(room_alias)

                if mapping["room_id"] != event.room_id:
                    raise SynapseError(
                        400, "Room alias %s does not point to the room" %
                        (room_alias_str, ))

        federation_handler = self.hs.get_handlers().federation_handler

        if event.type == EventTypes.Member:
            if event.content["membership"] == Membership.INVITE:

                def is_inviter_member_event(e):
                    return (e.type == EventTypes.Member
                            and e.sender == event.sender)

                state_to_include_ids = [
                    e_id for k, e_id in context.current_state_ids.items()
                    if k[0] in self.hs.config.room_invite_state_types
                    or k[0] == EventTypes.Member and k[1] == event.sender
                ]

                state_to_include = yield self.store.get_events(
                    state_to_include_ids)

                event.unsigned["invite_room_state"] = [{
                    "type": e.type,
                    "state_key": e.state_key,
                    "content": e.content,
                    "sender": e.sender,
                } for e in state_to_include.values()]

                invitee = UserID.from_string(event.state_key)
                if not self.hs.is_mine(invitee):
                    # TODO: Can we add signature from remote server in a nicer
                    # way? If we have been invited by a remote server, we need
                    # to get them to sign the event.

                    returned_invite = yield federation_handler.send_invite(
                        invitee.domain,
                        event,
                    )

                    event.unsigned.pop("room_state", None)

                    # TODO: Make sure the signatures actually are correct.
                    event.signatures.update(returned_invite.signatures)

        if event.type == EventTypes.Redaction:
            auth_events_ids = yield self.auth.compute_auth_events(
                event,
                context.prev_state_ids,
                for_verification=True,
            )
            auth_events = yield self.store.get_events(auth_events_ids)
            auth_events = {(e.type, e.state_key): e
                           for e in auth_events.values()}
            if self.auth.check_redaction(event, auth_events=auth_events):
                original_event = yield self.store.get_event(
                    event.redacts,
                    check_redacted=False,
                    get_prev_content=False,
                    allow_rejected=False,
                    allow_none=False)
                if event.user_id != original_event.user_id:
                    raise AuthError(
                        403, "You don't have permission to redact events")

        if event.type == EventTypes.Create and context.prev_state_ids:
            raise AuthError(
                403,
                "Changing the room create event is forbidden",
            )

        action_generator = ActionGenerator(self.hs)
        yield action_generator.handle_push_actions_for_event(event, context)

        (event_stream_id,
         max_stream_id) = yield self.store.persist_event(event,
                                                         context=context)

        # this intentionally does not yield: we don't care about the result
        # and don't need to wait for it.
        preserve_fn(self.hs.get_pusherpool().on_new_notifications)(
            event_stream_id, max_stream_id)

        @defer.inlineCallbacks
        def _notify():
            yield run_on_reactor()
            yield self.notifier.on_new_room_event(event,
                                                  event_stream_id,
                                                  max_stream_id,
                                                  extra_users=extra_users)

        preserve_fn(_notify)()

        # If invite, remove room_state from unsigned before sending.
        event.unsigned.pop("invite_room_state", None)
예제 #5
0
class MessageHandler(BaseHandler):

    def __init__(self, hs):
        super(MessageHandler, self).__init__(hs)
        self.hs = hs
        self.state = hs.get_state_handler()
        self.clock = hs.get_clock()
        self.validator = EventValidator()
        self.snapshot_cache = SnapshotCache()

        self.pagination_lock = ReadWriteLock()

    @defer.inlineCallbacks
    def purge_history(self, room_id, event_id):
        event = yield self.store.get_event(event_id)

        if event.room_id != room_id:
            raise SynapseError(400, "Event is for wrong room.")

        depth = event.depth

        with (yield self.pagination_lock.write(room_id)):
            yield self.store.delete_old_state(room_id, depth)

    @defer.inlineCallbacks
    def get_messages(self, requester, room_id=None, pagin_config=None,
                     as_client_event=True, event_filter=None):
        """Get messages in a room.

        Args:
            requester (Requester): 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.
            as_client_event (bool): True to get events in client-server format.
            event_filter (Filter): Filter to apply to results or None
        Returns:
            dict: Pagination API results
        """
        user_id = requester.user.to_string()

        if pagin_config.from_token:
            room_token = pagin_config.from_token.room_key
        else:
            pagin_config.from_token = (
                yield self.hs.get_event_sources().get_current_token(
                    direction='b'
                )
            )
            room_token = pagin_config.from_token.room_key

        room_token = RoomStreamToken.parse(room_token)

        pagin_config.from_token = pagin_config.from_token.copy_and_replace(
            "room_key", str(room_token)
        )

        source_config = pagin_config.get_source_config("room")

        with (yield self.pagination_lock.read(room_id)):
            membership, member_event_id = yield self._check_in_room_or_world_readable(
                room_id, user_id
            )

            if source_config.direction == 'b':
                # if we're going backwards, we might need to backfill. This
                # requires that we have a topo token.
                if room_token.topological:
                    max_topo = room_token.topological
                else:
                    max_topo = yield self.store.get_max_topological_token(
                        room_id, room_token.stream
                    )

                if membership == Membership.LEAVE:
                    # If they have left the room then clamp the token to be before
                    # they left the room, to save the effort of loading from the
                    # database.
                    leave_token = yield self.store.get_topological_token_for_event(
                        member_event_id
                    )
                    leave_token = RoomStreamToken.parse(leave_token)
                    if leave_token.topological < max_topo:
                        source_config.from_key = str(leave_token)

                yield self.hs.get_handlers().federation_handler.maybe_backfill(
                    room_id, max_topo
                )

            events, next_key = yield self.store.paginate_room_events(
                room_id=room_id,
                from_key=source_config.from_key,
                to_key=source_config.to_key,
                direction=source_config.direction,
                limit=source_config.limit,
                event_filter=event_filter,
            )

            next_token = pagin_config.from_token.copy_and_replace(
                "room_key", next_key
            )

        if not events:
            defer.returnValue({
                "chunk": [],
                "start": pagin_config.from_token.to_string(),
                "end": next_token.to_string(),
            })

        if event_filter:
            events = event_filter.filter(events)

        events = yield filter_events_for_client(
            self.store,
            user_id,
            events,
            is_peeking=(member_event_id is None),
        )

        time_now = self.clock.time_msec()

        chunk = {
            "chunk": [
                serialize_event(e, time_now, as_client_event)
                for e in events
            ],
            "start": pagin_config.from_token.to_string(),
            "end": next_token.to_string(),
        }

        defer.returnValue(chunk)

    @defer.inlineCallbacks
    def create_event(self, event_dict, token_id=None, txn_id=None, prev_event_ids=None):
        """
        Given a dict from a client, create a new event.

        Creates an FrozenEvent object, filling out auth_events, prev_events,
        etc.

        Adds display names to Join membership events.

        Args:
            event_dict (dict): An entire event
            token_id (str)
            txn_id (str)
            prev_event_ids (list): The prev event ids to use when creating the event

        Returns:
            Tuple of created event (FrozenEvent), Context
        """
        builder = self.event_builder_factory.new(event_dict)

        self.validator.validate_new(builder)

        if builder.type == EventTypes.Member:
            membership = builder.content.get("membership", None)
            target = UserID.from_string(builder.state_key)

            if membership in {Membership.JOIN, Membership.INVITE}:
                # If event doesn't include a display name, add one.
                profile = self.hs.get_handlers().profile_handler
                content = builder.content

                try:
                    content["displayname"] = yield profile.get_displayname(target)
                    content["avatar_url"] = yield profile.get_avatar_url(target)
                except Exception as e:
                    logger.info(
                        "Failed to get profile information for %r: %s",
                        target, e
                    )

        if token_id is not None:
            builder.internal_metadata.token_id = token_id

        if txn_id is not None:
            builder.internal_metadata.txn_id = txn_id

        event, context = yield self._create_new_client_event(
            builder=builder,
            prev_event_ids=prev_event_ids,
        )
        defer.returnValue((event, context))

    @defer.inlineCallbacks
    def send_nonmember_event(self, requester, event, context, ratelimit=True):
        """
        Persists and notifies local clients and federation of an event.

        Args:
            event (FrozenEvent) the event to send.
            context (Context) the context of the event.
            ratelimit (bool): Whether to rate limit this send.
            is_guest (bool): Whether the sender is a guest.
        """
        if event.type == EventTypes.Member:
            raise SynapseError(
                500,
                "Tried to send member event through non-member codepath"
            )

        user = UserID.from_string(event.sender)

        assert self.hs.is_mine(user), "User must be our own: %s" % (user,)

        if event.is_state():
            prev_state = yield self.deduplicate_state_event(event, context)
            if prev_state is not None:
                defer.returnValue(prev_state)

        yield self.handle_new_client_event(
            requester=requester,
            event=event,
            context=context,
            ratelimit=ratelimit,
        )

        if event.type == EventTypes.Message:
            presence = self.hs.get_presence_handler()
            yield presence.bump_presence_active_time(user)

    @defer.inlineCallbacks
    def deduplicate_state_event(self, event, context):
        """
        Checks whether event is in the latest resolved state in context.

        If so, returns the version of the event in context.
        Otherwise, returns None.
        """
        prev_event_id = context.prev_state_ids.get((event.type, event.state_key))
        prev_event = yield self.store.get_event(prev_event_id, allow_none=True)
        if not prev_event:
            return

        if prev_event and event.user_id == prev_event.user_id:
            prev_content = encode_canonical_json(prev_event.content)
            next_content = encode_canonical_json(event.content)
            if prev_content == next_content:
                defer.returnValue(prev_event)
        return

    @defer.inlineCallbacks
    def create_and_send_nonmember_event(
        self,
        requester,
        event_dict,
        ratelimit=True,
        txn_id=None
    ):
        """
        Creates an event, then sends it.

        See self.create_event and self.send_nonmember_event.
        """
        event, context = yield self.create_event(
            event_dict,
            token_id=requester.access_token_id,
            txn_id=txn_id
        )
        yield self.send_nonmember_event(
            requester,
            event,
            context,
            ratelimit=ratelimit,
        )
        defer.returnValue(event)

    @defer.inlineCallbacks
    def get_room_data(self, user_id=None, room_id=None,
                      event_type=None, state_key="", is_guest=False):
        """ Get data from a room.

        Args:
            event : The room path event
        Returns:
            The path data content.
        Raises:
            SynapseError if something went wrong.
        """
        membership, membership_event_id = yield self._check_in_room_or_world_readable(
            room_id, user_id
        )

        if membership == Membership.JOIN:
            data = yield self.state_handler.get_current_state(
                room_id, event_type, state_key
            )
        elif membership == Membership.LEAVE:
            key = (event_type, state_key)
            room_state = yield self.store.get_state_for_events(
                [membership_event_id], [key]
            )
            data = room_state[membership_event_id].get(key)

        defer.returnValue(data)

    @defer.inlineCallbacks
    def _check_in_room_or_world_readable(self, room_id, user_id):
        try:
            # check_user_was_in_room will return the most recent membership
            # event for the user if:
            #  * The user is a non-guest user, and was ever in the room
            #  * The user is a guest user, and has joined the room
            # else it will throw.
            member_event = yield self.auth.check_user_was_in_room(room_id, user_id)
            defer.returnValue((member_event.membership, member_event.event_id))
            return
        except AuthError:
            visibility = yield self.state_handler.get_current_state(
                room_id, EventTypes.RoomHistoryVisibility, ""
            )
            if (
                visibility and
                visibility.content["history_visibility"] == "world_readable"
            ):
                defer.returnValue((Membership.JOIN, None))
                return
            raise AuthError(
                403, "Guest access not allowed", errcode=Codes.GUEST_ACCESS_FORBIDDEN
            )

    @defer.inlineCallbacks
    def get_state_events(self, user_id, room_id, is_guest=False):
        """Retrieve all state events for a given room. If the user is
        joined to the room then return the current state. If the user has
        left the room return the state events from when they left.

        Args:
            user_id(str): The user requesting state events.
            room_id(str): The room ID to get all state events from.
        Returns:
            A list of dicts representing state events. [{}, {}, {}]
        """
        membership, membership_event_id = yield self._check_in_room_or_world_readable(
            room_id, user_id
        )

        if membership == Membership.JOIN:
            room_state = yield self.state_handler.get_current_state(room_id)
        elif membership == Membership.LEAVE:
            room_state = yield self.store.get_state_for_events(
                [membership_event_id], None
            )
            room_state = room_state[membership_event_id]

        now = self.clock.time_msec()
        defer.returnValue(
            [serialize_event(c, now) for c in room_state.values()]
        )

    def snapshot_all_rooms(self, user_id=None, pagin_config=None,
                           as_client_event=True, include_archived=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.
            as_client_event (bool): True to get events in client-server format.
            include_archived (bool): True to get rooms that the user has left
        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.
        """
        key = (
            user_id,
            pagin_config.from_token,
            pagin_config.to_token,
            pagin_config.direction,
            pagin_config.limit,
            as_client_event,
            include_archived,
        )
        now_ms = self.clock.time_msec()
        result = self.snapshot_cache.get(now_ms, key)
        if result is not None:
            return result

        return self.snapshot_cache.set(now_ms, key, self._snapshot_all_rooms(
            user_id, pagin_config, as_client_event, include_archived
        ))

    @defer.inlineCallbacks
    def _snapshot_all_rooms(self, user_id=None, pagin_config=None,
                            as_client_event=True, include_archived=False):

        memberships = [Membership.INVITE, Membership.JOIN]
        if include_archived:
            memberships.append(Membership.LEAVE)

        room_list = yield self.store.get_rooms_for_user_where_membership_is(
            user_id=user_id, membership_list=memberships
        )

        user = UserID.from_string(user_id)

        rooms_ret = []

        now_token = yield self.hs.get_event_sources().get_current_token()

        presence_stream = self.hs.get_event_sources().sources["presence"]
        pagination_config = PaginationConfig(from_token=now_token)
        presence, _ = yield presence_stream.get_pagination_rows(
            user, pagination_config.get_source_config("presence"), None
        )

        receipt_stream = self.hs.get_event_sources().sources["receipt"]
        receipt, _ = yield receipt_stream.get_pagination_rows(
            user, pagination_config.get_source_config("receipt"), None
        )

        tags_by_room = yield self.store.get_tags_for_user(user_id)

        account_data, account_data_by_room = (
            yield self.store.get_account_data_for_user(user_id)
        )

        public_room_ids = yield self.store.get_public_room_ids()

        limit = pagin_config.limit
        if limit is None:
            limit = 10

        @defer.inlineCallbacks
        def handle_room(event):
            d = {
                "room_id": event.room_id,
                "membership": event.membership,
                "visibility": (
                    "public" if event.room_id in public_room_ids
                    else "private"
                ),
            }

            if event.membership == Membership.INVITE:
                time_now = self.clock.time_msec()
                d["inviter"] = event.sender

                invite_event = yield self.store.get_event(event.event_id)
                d["invite"] = serialize_event(invite_event, time_now, as_client_event)

            rooms_ret.append(d)

            if event.membership not in (Membership.JOIN, Membership.LEAVE):
                return

            try:
                if event.membership == Membership.JOIN:
                    room_end_token = now_token.room_key
                    deferred_room_state = self.state_handler.get_current_state(
                        event.room_id
                    )
                elif event.membership == Membership.LEAVE:
                    room_end_token = "s%d" % (event.stream_ordering,)
                    deferred_room_state = self.store.get_state_for_events(
                        [event.event_id], None
                    )
                    deferred_room_state.addCallback(
                        lambda states: states[event.event_id]
                    )

                (messages, token), current_state = yield preserve_context_over_deferred(
                    defer.gatherResults(
                        [
                            preserve_fn(self.store.get_recent_events_for_room)(
                                event.room_id,
                                limit=limit,
                                end_token=room_end_token,
                            ),
                            deferred_room_state,
                        ]
                    )
                ).addErrback(unwrapFirstError)

                messages = yield filter_events_for_client(
                    self.store, user_id, messages
                )

                start_token = now_token.copy_and_replace("room_key", token[0])
                end_token = now_token.copy_and_replace("room_key", token[1])
                time_now = self.clock.time_msec()

                d["messages"] = {
                    "chunk": [
                        serialize_event(m, time_now, as_client_event)
                        for m in messages
                    ],
                    "start": start_token.to_string(),
                    "end": end_token.to_string(),
                }

                d["state"] = [
                    serialize_event(c, time_now, as_client_event)
                    for c in current_state.values()
                ]

                account_data_events = []
                tags = tags_by_room.get(event.room_id)
                if tags:
                    account_data_events.append({
                        "type": "m.tag",
                        "content": {"tags": tags},
                    })

                account_data = account_data_by_room.get(event.room_id, {})
                for account_data_type, content in account_data.items():
                    account_data_events.append({
                        "type": account_data_type,
                        "content": content,
                    })

                d["account_data"] = account_data_events
            except:
                logger.exception("Failed to get snapshot")

        yield concurrently_execute(handle_room, room_list, 10)

        account_data_events = []
        for account_data_type, content in account_data.items():
            account_data_events.append({
                "type": account_data_type,
                "content": content,
            })

        ret = {
            "rooms": rooms_ret,
            "presence": presence,
            "account_data": account_data_events,
            "receipts": receipt,
            "end": now_token.to_string(),
        }

        defer.returnValue(ret)

    @defer.inlineCallbacks
    def room_initial_sync(self, requester, room_id, pagin_config=None):
        """Capture the a snapshot of a room. If user is currently a member of
        the room this will be what is currently in the room. If the user left
        the room this will be what was in the room when they left.

        Args:
            requester(Requester): The user to get a snapshot for.
            room_id(str): The room to get a snapshot of.
            pagin_config(synapse.streams.config.PaginationConfig):
                The pagination config used to determine how many messages to
                return.
        Raises:
            AuthError if the user wasn't in the room.
        Returns:
            A JSON serialisable dict with the snapshot of the room.
        """

        user_id = requester.user.to_string()

        membership, member_event_id = yield self._check_in_room_or_world_readable(
            room_id, user_id,
        )
        is_peeking = member_event_id is None

        if membership == Membership.JOIN:
            result = yield self._room_initial_sync_joined(
                user_id, room_id, pagin_config, membership, is_peeking
            )
        elif membership == Membership.LEAVE:
            result = yield self._room_initial_sync_parted(
                user_id, room_id, pagin_config, membership, member_event_id, is_peeking
            )

        account_data_events = []
        tags = yield self.store.get_tags_for_room(user_id, room_id)
        if tags:
            account_data_events.append({
                "type": "m.tag",
                "content": {"tags": tags},
            })

        account_data = yield self.store.get_account_data_for_room(user_id, room_id)
        for account_data_type, content in account_data.items():
            account_data_events.append({
                "type": account_data_type,
                "content": content,
            })

        result["account_data"] = account_data_events

        defer.returnValue(result)

    @defer.inlineCallbacks
    def _room_initial_sync_parted(self, user_id, room_id, pagin_config,
                                  membership, member_event_id, is_peeking):
        room_state = yield self.store.get_state_for_events(
            [member_event_id], None
        )

        room_state = room_state[member_event_id]

        limit = pagin_config.limit if pagin_config else None
        if limit is None:
            limit = 10

        stream_token = yield self.store.get_stream_token_for_event(
            member_event_id
        )

        messages, token = yield self.store.get_recent_events_for_room(
            room_id,
            limit=limit,
            end_token=stream_token
        )

        messages = yield filter_events_for_client(
            self.store, user_id, messages, is_peeking=is_peeking
        )

        start_token = StreamToken.START.copy_and_replace("room_key", token[0])
        end_token = StreamToken.START.copy_and_replace("room_key", token[1])

        time_now = self.clock.time_msec()

        defer.returnValue({
            "membership": membership,
            "room_id": room_id,
            "messages": {
                "chunk": [serialize_event(m, time_now) for m in messages],
                "start": start_token.to_string(),
                "end": end_token.to_string(),
            },
            "state": [serialize_event(s, time_now) for s in room_state.values()],
            "presence": [],
            "receipts": [],
        })

    @defer.inlineCallbacks
    def _room_initial_sync_joined(self, user_id, room_id, pagin_config,
                                  membership, is_peeking):
        current_state = yield self.state.get_current_state(
            room_id=room_id,
        )

        # TODO: These concurrently
        time_now = self.clock.time_msec()
        state = [
            serialize_event(x, time_now)
            for x in current_state.values()
        ]

        now_token = yield self.hs.get_event_sources().get_current_token()

        limit = pagin_config.limit if pagin_config else None
        if limit is None:
            limit = 10

        room_members = [
            m for m in current_state.values()
            if m.type == EventTypes.Member
            and m.content["membership"] == Membership.JOIN
        ]

        presence_handler = self.hs.get_presence_handler()

        @defer.inlineCallbacks
        def get_presence():
            states = yield presence_handler.get_states(
                [m.user_id for m in room_members],
                as_event=True,
            )

            defer.returnValue(states)

        @defer.inlineCallbacks
        def get_receipts():
            receipts_handler = self.hs.get_handlers().receipts_handler
            receipts = yield receipts_handler.get_receipts_for_room(
                room_id,
                now_token.receipt_key
            )
            defer.returnValue(receipts)

        presence, receipts, (messages, token) = yield defer.gatherResults(
            [
                preserve_fn(get_presence)(),
                preserve_fn(get_receipts)(),
                preserve_fn(self.store.get_recent_events_for_room)(
                    room_id,
                    limit=limit,
                    end_token=now_token.room_key,
                )
            ],
            consumeErrors=True,
        ).addErrback(unwrapFirstError)

        messages = yield filter_events_for_client(
            self.store, user_id, messages, is_peeking=is_peeking,
        )

        start_token = now_token.copy_and_replace("room_key", token[0])
        end_token = now_token.copy_and_replace("room_key", token[1])

        time_now = self.clock.time_msec()

        ret = {
            "room_id": room_id,
            "messages": {
                "chunk": [serialize_event(m, time_now) for m in messages],
                "start": start_token.to_string(),
                "end": end_token.to_string(),
            },
            "state": state,
            "presence": presence,
            "receipts": receipts,
        }
        if not is_peeking:
            ret["membership"] = membership

        defer.returnValue(ret)

    @measure_func("_create_new_client_event")
    @defer.inlineCallbacks
    def _create_new_client_event(self, builder, prev_event_ids=None):
        if prev_event_ids:
            prev_events = yield self.store.add_event_hashes(prev_event_ids)
            prev_max_depth = yield self.store.get_max_depth_of_events(prev_event_ids)
            depth = prev_max_depth + 1
        else:
            latest_ret = yield self.store.get_latest_event_ids_and_hashes_in_room(
                builder.room_id,
            )

            if latest_ret:
                depth = max([d for _, _, d in latest_ret]) + 1
            else:
                depth = 1

            prev_events = [
                (event_id, prev_hashes)
                for event_id, prev_hashes, _ in latest_ret
            ]

        builder.prev_events = prev_events
        builder.depth = depth

        state_handler = self.state_handler

        context = yield state_handler.compute_event_context(builder)

        if builder.is_state():
            builder.prev_state = yield self.store.add_event_hashes(
                context.prev_state_events
            )

        yield self.auth.add_auth_events(builder, context)

        signing_key = self.hs.config.signing_key[0]
        add_hashes_and_signatures(
            builder, self.server_name, signing_key
        )

        event = builder.build()

        logger.debug(
            "Created event %s with state: %s",
            event.event_id, context.prev_state_ids,
        )

        defer.returnValue(
            (event, context,)
        )

    @measure_func("handle_new_client_event")
    @defer.inlineCallbacks
    def handle_new_client_event(
        self,
        requester,
        event,
        context,
        ratelimit=True,
        extra_users=[]
    ):
        # We now need to go and hit out to wherever we need to hit out to.

        if ratelimit:
            self.ratelimit(requester)

        try:
            yield self.auth.check_from_context(event, context)
        except AuthError as err:
            logger.warn("Denying new event %r because %s", event, err)
            raise err

        yield self.maybe_kick_guest_users(event, context)

        if event.type == EventTypes.CanonicalAlias:
            # Check the alias is acually valid (at this time at least)
            room_alias_str = event.content.get("alias", None)
            if room_alias_str:
                room_alias = RoomAlias.from_string(room_alias_str)
                directory_handler = self.hs.get_handlers().directory_handler
                mapping = yield directory_handler.get_association(room_alias)

                if mapping["room_id"] != event.room_id:
                    raise SynapseError(
                        400,
                        "Room alias %s does not point to the room" % (
                            room_alias_str,
                        )
                    )

        federation_handler = self.hs.get_handlers().federation_handler

        if event.type == EventTypes.Member:
            if event.content["membership"] == Membership.INVITE:
                def is_inviter_member_event(e):
                    return (
                        e.type == EventTypes.Member and
                        e.sender == event.sender
                    )

                state_to_include_ids = [
                    e_id
                    for k, e_id in context.current_state_ids.items()
                    if k[0] in self.hs.config.room_invite_state_types
                    or k[0] == EventTypes.Member and k[1] == event.sender
                ]

                state_to_include = yield self.store.get_events(state_to_include_ids)

                event.unsigned["invite_room_state"] = [
                    {
                        "type": e.type,
                        "state_key": e.state_key,
                        "content": e.content,
                        "sender": e.sender,
                    }
                    for e in state_to_include.values()
                ]

                invitee = UserID.from_string(event.state_key)
                if not self.hs.is_mine(invitee):
                    # TODO: Can we add signature from remote server in a nicer
                    # way? If we have been invited by a remote server, we need
                    # to get them to sign the event.

                    returned_invite = yield federation_handler.send_invite(
                        invitee.domain,
                        event,
                    )

                    event.unsigned.pop("room_state", None)

                    # TODO: Make sure the signatures actually are correct.
                    event.signatures.update(
                        returned_invite.signatures
                    )

        if event.type == EventTypes.Redaction:
            auth_events_ids = yield self.auth.compute_auth_events(
                event, context.prev_state_ids, for_verification=True,
            )
            auth_events = yield self.store.get_events(auth_events_ids)
            auth_events = {
                (e.type, e.state_key): e for e in auth_events.values()
            }
            if self.auth.check_redaction(event, auth_events=auth_events):
                original_event = yield self.store.get_event(
                    event.redacts,
                    check_redacted=False,
                    get_prev_content=False,
                    allow_rejected=False,
                    allow_none=False
                )
                if event.user_id != original_event.user_id:
                    raise AuthError(
                        403,
                        "You don't have permission to redact events"
                    )

        if event.type == EventTypes.Create and context.prev_state_ids:
            raise AuthError(
                403,
                "Changing the room create event is forbidden",
            )

        action_generator = ActionGenerator(self.hs)
        yield action_generator.handle_push_actions_for_event(
            event, context
        )

        (event_stream_id, max_stream_id) = yield self.store.persist_event(
            event, context=context
        )

        # this intentionally does not yield: we don't care about the result
        # and don't need to wait for it.
        preserve_fn(self.hs.get_pusherpool().on_new_notifications)(
            event_stream_id, max_stream_id
        )

        users_in_room = yield self.store.get_joined_users_from_context(event, context)

        destinations = [
            get_domain_from_id(user_id) for user_id in users_in_room
            if not self.hs.is_mine_id(user_id)
        ]

        @defer.inlineCallbacks
        def _notify():
            yield run_on_reactor()
            yield self.notifier.on_new_room_event(
                event, event_stream_id, max_stream_id,
                extra_users=extra_users
            )

        preserve_fn(_notify)()

        # If invite, remove room_state from unsigned before sending.
        event.unsigned.pop("invite_room_state", None)

        preserve_fn(federation_handler.handle_new_event)(
            event, destinations=destinations,
        )
예제 #6
0
class MessageHandler(BaseHandler):

    def __init__(self, hs):
        super(MessageHandler, self).__init__(hs)
        self.hs = hs
        self.state = hs.get_state_handler()
        self.clock = hs.get_clock()
        self.validator = EventValidator()
        self.snapshot_cache = SnapshotCache()

        self.pagination_lock = ReadWriteLock()

    @defer.inlineCallbacks
    def purge_history(self, room_id, event_id):
        event = yield self.store.get_event(event_id)

        if event.room_id != room_id:
            raise SynapseError(400, "Event is for wrong room.")

        depth = event.depth

        with (yield self.pagination_lock.write(room_id)):
            yield self.store.delete_old_state(room_id, depth)

    @defer.inlineCallbacks
    def get_messages(self, requester, room_id=None, pagin_config=None,
                     as_client_event=True, event_filter=None):
        """Get messages in a room.

        Args:
            requester (Requester): 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.
            as_client_event (bool): True to get events in client-server format.
            event_filter (Filter): Filter to apply to results or None
        Returns:
            dict: Pagination API results
        """
        user_id = requester.user.to_string()

        if pagin_config.from_token:
            room_token = pagin_config.from_token.room_key
        else:
            pagin_config.from_token = (
                yield self.hs.get_event_sources().get_current_token(
                    direction='b'
                )
            )
            room_token = pagin_config.from_token.room_key

        room_token = RoomStreamToken.parse(room_token)

        pagin_config.from_token = pagin_config.from_token.copy_and_replace(
            "room_key", str(room_token)
        )

        source_config = pagin_config.get_source_config("room")

        with (yield self.pagination_lock.read(room_id)):
            membership, member_event_id = yield self._check_in_room_or_world_readable(
                room_id, user_id
            )

            if source_config.direction == 'b':
                # if we're going backwards, we might need to backfill. This
                # requires that we have a topo token.
                if room_token.topological:
                    max_topo = room_token.topological
                else:
                    max_topo = yield self.store.get_max_topological_token(
                        room_id, room_token.stream
                    )

                if membership == Membership.LEAVE:
                    # If they have left the room then clamp the token to be before
                    # they left the room, to save the effort of loading from the
                    # database.
                    leave_token = yield self.store.get_topological_token_for_event(
                        member_event_id
                    )
                    leave_token = RoomStreamToken.parse(leave_token)
                    if leave_token.topological < max_topo:
                        source_config.from_key = str(leave_token)

                yield self.hs.get_handlers().federation_handler.maybe_backfill(
                    room_id, max_topo
                )

            events, next_key = yield self.store.paginate_room_events(
                room_id=room_id,
                from_key=source_config.from_key,
                to_key=source_config.to_key,
                direction=source_config.direction,
                limit=source_config.limit,
                event_filter=event_filter,
            )

            next_token = pagin_config.from_token.copy_and_replace(
                "room_key", next_key
            )

        if not events:
            defer.returnValue({
                "chunk": [],
                "start": pagin_config.from_token.to_string(),
                "end": next_token.to_string(),
            })

        if event_filter:
            events = event_filter.filter(events)

        events = yield filter_events_for_client(
            self.store,
            user_id,
            events,
            is_peeking=(member_event_id is None),
        )

        time_now = self.clock.time_msec()

        chunk = {
            "chunk": [
                serialize_event(e, time_now, as_client_event)
                for e in events
            ],
            "start": pagin_config.from_token.to_string(),
            "end": next_token.to_string(),
        }

        defer.returnValue(chunk)

    @defer.inlineCallbacks
    def create_event(self, event_dict, token_id=None, txn_id=None, prev_event_ids=None):
        """
        Given a dict from a client, create a new event.

        Creates an FrozenEvent object, filling out auth_events, prev_events,
        etc.

        Adds display names to Join membership events.

        Args:
            event_dict (dict): An entire event
            token_id (str)
            txn_id (str)
            prev_event_ids (list): The prev event ids to use when creating the event

        Returns:
            Tuple of created event (FrozenEvent), Context
        """
        builder = self.event_builder_factory.new(event_dict)

        self.validator.validate_new(builder)

        if builder.type == EventTypes.Member:
            membership = builder.content.get("membership", None)
            target = UserID.from_string(builder.state_key)

            if membership in {Membership.JOIN, Membership.INVITE}:
                # If event doesn't include a display name, add one.
                profile = self.hs.get_handlers().profile_handler
                content = builder.content

                try:
                    content["displayname"] = yield profile.get_displayname(target)
                    content["avatar_url"] = yield profile.get_avatar_url(target)
                except Exception as e:
                    logger.info(
                        "Failed to get profile information for %r: %s",
                        target, e
                    )

        if token_id is not None:
            builder.internal_metadata.token_id = token_id

        if txn_id is not None:
            builder.internal_metadata.txn_id = txn_id

        event, context = yield self._create_new_client_event(
            builder=builder,
            prev_event_ids=prev_event_ids,
        )
        defer.returnValue((event, context))

    @defer.inlineCallbacks
    def send_nonmember_event(self, requester, event, context, ratelimit=True):
        """
        Persists and notifies local clients and federation of an event.

        Args:
            event (FrozenEvent) the event to send.
            context (Context) the context of the event.
            ratelimit (bool): Whether to rate limit this send.
            is_guest (bool): Whether the sender is a guest.
        """
        if event.type == EventTypes.Member:
            raise SynapseError(
                500,
                "Tried to send member event through non-member codepath"
            )

        user = UserID.from_string(event.sender)

        assert self.hs.is_mine(user), "User must be our own: %s" % (user,)

        if event.is_state():
            prev_state = self.deduplicate_state_event(event, context)
            if prev_state is not None:
                defer.returnValue(prev_state)

        yield self.handle_new_client_event(
            requester=requester,
            event=event,
            context=context,
            ratelimit=ratelimit,
        )

        if event.type == EventTypes.Message:
            presence = self.hs.get_presence_handler()
            yield presence.bump_presence_active_time(user)

    def deduplicate_state_event(self, event, context):
        """
        Checks whether event is in the latest resolved state in context.

        If so, returns the version of the event in context.
        Otherwise, returns None.
        """
        prev_event = context.current_state.get((event.type, event.state_key))
        if prev_event and event.user_id == prev_event.user_id:
            prev_content = encode_canonical_json(prev_event.content)
            next_content = encode_canonical_json(event.content)
            if prev_content == next_content:
                return prev_event
        return None

    @defer.inlineCallbacks
    def create_and_send_nonmember_event(
        self,
        requester,
        event_dict,
        ratelimit=True,
        txn_id=None
    ):
        """
        Creates an event, then sends it.

        See self.create_event and self.send_nonmember_event.
        """
        event, context = yield self.create_event(
            event_dict,
            token_id=requester.access_token_id,
            txn_id=txn_id
        )
        yield self.send_nonmember_event(
            requester,
            event,
            context,
            ratelimit=ratelimit,
        )
        defer.returnValue(event)

    @defer.inlineCallbacks
    def get_room_data(self, user_id=None, room_id=None,
                      event_type=None, state_key="", is_guest=False):
        """ Get data from a room.

        Args:
            event : The room path event
        Returns:
            The path data content.
        Raises:
            SynapseError if something went wrong.
        """
        membership, membership_event_id = yield self._check_in_room_or_world_readable(
            room_id, user_id
        )

        if membership == Membership.JOIN:
            data = yield self.state_handler.get_current_state(
                room_id, event_type, state_key
            )
        elif membership == Membership.LEAVE:
            key = (event_type, state_key)
            room_state = yield self.store.get_state_for_events(
                [membership_event_id], [key]
            )
            data = room_state[membership_event_id].get(key)

        defer.returnValue(data)

    @defer.inlineCallbacks
    def _check_in_room_or_world_readable(self, room_id, user_id):
        try:
            # check_user_was_in_room will return the most recent membership
            # event for the user if:
            #  * The user is a non-guest user, and was ever in the room
            #  * The user is a guest user, and has joined the room
            # else it will throw.
            member_event = yield self.auth.check_user_was_in_room(room_id, user_id)
            defer.returnValue((member_event.membership, member_event.event_id))
            return
        except AuthError:
            visibility = yield self.state_handler.get_current_state(
                room_id, EventTypes.RoomHistoryVisibility, ""
            )
            if (
                visibility and
                visibility.content["history_visibility"] == "world_readable"
            ):
                defer.returnValue((Membership.JOIN, None))
                return
            raise AuthError(
                403, "Guest access not allowed", errcode=Codes.GUEST_ACCESS_FORBIDDEN
            )

    @defer.inlineCallbacks
    def get_state_events(self, user_id, room_id, is_guest=False):
        """Retrieve all state events for a given room. If the user is
        joined to the room then return the current state. If the user has
        left the room return the state events from when they left.

        Args:
            user_id(str): The user requesting state events.
            room_id(str): The room ID to get all state events from.
        Returns:
            A list of dicts representing state events. [{}, {}, {}]
        """
        membership, membership_event_id = yield self._check_in_room_or_world_readable(
            room_id, user_id
        )

        if membership == Membership.JOIN:
            room_state = yield self.state_handler.get_current_state(room_id)
        elif membership == Membership.LEAVE:
            room_state = yield self.store.get_state_for_events(
                [membership_event_id], None
            )
            room_state = room_state[membership_event_id]

        now = self.clock.time_msec()
        defer.returnValue(
            [serialize_event(c, now) for c in room_state.values()]
        )

    def snapshot_all_rooms(self, user_id=None, pagin_config=None,
                           as_client_event=True, include_archived=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.
            as_client_event (bool): True to get events in client-server format.
            include_archived (bool): True to get rooms that the user has left
        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.
        """
        key = (
            user_id,
            pagin_config.from_token,
            pagin_config.to_token,
            pagin_config.direction,
            pagin_config.limit,
            as_client_event,
            include_archived,
        )
        now_ms = self.clock.time_msec()
        result = self.snapshot_cache.get(now_ms, key)
        if result is not None:
            return result

        return self.snapshot_cache.set(now_ms, key, self._snapshot_all_rooms(
            user_id, pagin_config, as_client_event, include_archived
        ))

    @defer.inlineCallbacks
    def _snapshot_all_rooms(self, user_id=None, pagin_config=None,
                            as_client_event=True, include_archived=False):

        memberships = [Membership.INVITE, Membership.JOIN]
        if include_archived:
            memberships.append(Membership.LEAVE)

        room_list = yield self.store.get_rooms_for_user_where_membership_is(
            user_id=user_id, membership_list=memberships
        )

        user = UserID.from_string(user_id)

        rooms_ret = []

        now_token = yield self.hs.get_event_sources().get_current_token()

        presence_stream = self.hs.get_event_sources().sources["presence"]
        pagination_config = PaginationConfig(from_token=now_token)
        presence, _ = yield presence_stream.get_pagination_rows(
            user, pagination_config.get_source_config("presence"), None
        )

        receipt_stream = self.hs.get_event_sources().sources["receipt"]
        receipt, _ = yield receipt_stream.get_pagination_rows(
            user, pagination_config.get_source_config("receipt"), None
        )

        tags_by_room = yield self.store.get_tags_for_user(user_id)

        account_data, account_data_by_room = (
            yield self.store.get_account_data_for_user(user_id)
        )

        public_room_ids = yield self.store.get_public_room_ids()

        limit = pagin_config.limit
        if limit is None:
            limit = 10

        @defer.inlineCallbacks
        def handle_room(event):
            d = {
                "room_id": event.room_id,
                "membership": event.membership,
                "visibility": (
                    "public" if event.room_id in public_room_ids
                    else "private"
                ),
            }

            if event.membership == Membership.INVITE:
                time_now = self.clock.time_msec()
                d["inviter"] = event.sender

                invite_event = yield self.store.get_event(event.event_id)
                d["invite"] = serialize_event(invite_event, time_now, as_client_event)

            rooms_ret.append(d)

            if event.membership not in (Membership.JOIN, Membership.LEAVE):
                return

            try:
                if event.membership == Membership.JOIN:
                    room_end_token = now_token.room_key
                    deferred_room_state = self.state_handler.get_current_state(
                        event.room_id
                    )
                elif event.membership == Membership.LEAVE:
                    room_end_token = "s%d" % (event.stream_ordering,)
                    deferred_room_state = self.store.get_state_for_events(
                        [event.event_id], None
                    )
                    deferred_room_state.addCallback(
                        lambda states: states[event.event_id]
                    )

                (messages, token), current_state = yield defer.gatherResults(
                    [
                        self.store.get_recent_events_for_room(
                            event.room_id,
                            limit=limit,
                            end_token=room_end_token,
                        ),
                        deferred_room_state,
                    ]
                ).addErrback(unwrapFirstError)

                messages = yield filter_events_for_client(
                    self.store, user_id, messages
                )

                start_token = now_token.copy_and_replace("room_key", token[0])
                end_token = now_token.copy_and_replace("room_key", token[1])
                time_now = self.clock.time_msec()

                d["messages"] = {
                    "chunk": [
                        serialize_event(m, time_now, as_client_event)
                        for m in messages
                    ],
                    "start": start_token.to_string(),
                    "end": end_token.to_string(),
                }

                d["state"] = [
                    serialize_event(c, time_now, as_client_event)
                    for c in current_state.values()
                ]

                account_data_events = []
                tags = tags_by_room.get(event.room_id)
                if tags:
                    account_data_events.append({
                        "type": "m.tag",
                        "content": {"tags": tags},
                    })

                account_data = account_data_by_room.get(event.room_id, {})
                for account_data_type, content in account_data.items():
                    account_data_events.append({
                        "type": account_data_type,
                        "content": content,
                    })

                d["account_data"] = account_data_events
            except:
                logger.exception("Failed to get snapshot")

        yield concurrently_execute(handle_room, room_list, 10)

        account_data_events = []
        for account_data_type, content in account_data.items():
            account_data_events.append({
                "type": account_data_type,
                "content": content,
            })

        ret = {
            "rooms": rooms_ret,
            "presence": presence,
            "account_data": account_data_events,
            "receipts": receipt,
            "end": now_token.to_string(),
        }

        defer.returnValue(ret)

    @defer.inlineCallbacks
    def room_initial_sync(self, requester, room_id, pagin_config=None):
        """Capture the a snapshot of a room. If user is currently a member of
        the room this will be what is currently in the room. If the user left
        the room this will be what was in the room when they left.

        Args:
            requester(Requester): The user to get a snapshot for.
            room_id(str): The room to get a snapshot of.
            pagin_config(synapse.streams.config.PaginationConfig):
                The pagination config used to determine how many messages to
                return.
        Raises:
            AuthError if the user wasn't in the room.
        Returns:
            A JSON serialisable dict with the snapshot of the room.
        """

        user_id = requester.user.to_string()

        membership, member_event_id = yield self._check_in_room_or_world_readable(
            room_id, user_id,
        )
        is_peeking = member_event_id is None

        if membership == Membership.JOIN:
            result = yield self._room_initial_sync_joined(
                user_id, room_id, pagin_config, membership, is_peeking
            )
        elif membership == Membership.LEAVE:
            result = yield self._room_initial_sync_parted(
                user_id, room_id, pagin_config, membership, member_event_id, is_peeking
            )

        account_data_events = []
        tags = yield self.store.get_tags_for_room(user_id, room_id)
        if tags:
            account_data_events.append({
                "type": "m.tag",
                "content": {"tags": tags},
            })

        account_data = yield self.store.get_account_data_for_room(user_id, room_id)
        for account_data_type, content in account_data.items():
            account_data_events.append({
                "type": account_data_type,
                "content": content,
            })

        result["account_data"] = account_data_events

        defer.returnValue(result)

    @defer.inlineCallbacks
    def _room_initial_sync_parted(self, user_id, room_id, pagin_config,
                                  membership, member_event_id, is_peeking):
        room_state = yield self.store.get_state_for_events(
            [member_event_id], None
        )

        room_state = room_state[member_event_id]

        limit = pagin_config.limit if pagin_config else None
        if limit is None:
            limit = 10

        stream_token = yield self.store.get_stream_token_for_event(
            member_event_id
        )

        messages, token = yield self.store.get_recent_events_for_room(
            room_id,
            limit=limit,
            end_token=stream_token
        )

        messages = yield filter_events_for_client(
            self.store, user_id, messages, is_peeking=is_peeking
        )

        start_token = StreamToken.START.copy_and_replace("room_key", token[0])
        end_token = StreamToken.START.copy_and_replace("room_key", token[1])

        time_now = self.clock.time_msec()

        defer.returnValue({
            "membership": membership,
            "room_id": room_id,
            "messages": {
                "chunk": [serialize_event(m, time_now) for m in messages],
                "start": start_token.to_string(),
                "end": end_token.to_string(),
            },
            "state": [serialize_event(s, time_now) for s in room_state.values()],
            "presence": [],
            "receipts": [],
        })

    @defer.inlineCallbacks
    def _room_initial_sync_joined(self, user_id, room_id, pagin_config,
                                  membership, is_peeking):
        current_state = yield self.state.get_current_state(
            room_id=room_id,
        )

        # TODO: These concurrently
        time_now = self.clock.time_msec()
        state = [
            serialize_event(x, time_now)
            for x in current_state.values()
        ]

        now_token = yield self.hs.get_event_sources().get_current_token()

        limit = pagin_config.limit if pagin_config else None
        if limit is None:
            limit = 10

        room_members = [
            m for m in current_state.values()
            if m.type == EventTypes.Member
            and m.content["membership"] == Membership.JOIN
        ]

        presence_handler = self.hs.get_presence_handler()

        @defer.inlineCallbacks
        def get_presence():
            states = yield presence_handler.get_states(
                [m.user_id for m in room_members],
                as_event=True,
            )

            defer.returnValue(states)

        @defer.inlineCallbacks
        def get_receipts():
            receipts_handler = self.hs.get_handlers().receipts_handler
            receipts = yield receipts_handler.get_receipts_for_room(
                room_id,
                now_token.receipt_key
            )
            defer.returnValue(receipts)

        presence, receipts, (messages, token) = yield defer.gatherResults(
            [
                get_presence(),
                get_receipts(),
                self.store.get_recent_events_for_room(
                    room_id,
                    limit=limit,
                    end_token=now_token.room_key,
                )
            ],
            consumeErrors=True,
        ).addErrback(unwrapFirstError)

        messages = yield filter_events_for_client(
            self.store, user_id, messages, is_peeking=is_peeking,
        )

        start_token = now_token.copy_and_replace("room_key", token[0])
        end_token = now_token.copy_and_replace("room_key", token[1])

        time_now = self.clock.time_msec()

        ret = {
            "room_id": room_id,
            "messages": {
                "chunk": [serialize_event(m, time_now) for m in messages],
                "start": start_token.to_string(),
                "end": end_token.to_string(),
            },
            "state": state,
            "presence": presence,
            "receipts": receipts,
        }
        if not is_peeking:
            ret["membership"] = membership

        defer.returnValue(ret)

    @defer.inlineCallbacks
    def _create_new_client_event(self, builder, prev_event_ids=None):
        if prev_event_ids:
            prev_events = yield self.store.add_event_hashes(prev_event_ids)
            prev_max_depth = yield self.store.get_max_depth_of_events(prev_event_ids)
            depth = prev_max_depth + 1
        else:
            latest_ret = yield self.store.get_latest_event_ids_and_hashes_in_room(
                builder.room_id,
            )

            if latest_ret:
                depth = max([d for _, _, d in latest_ret]) + 1
            else:
                depth = 1

            prev_events = [
                (event_id, prev_hashes)
                for event_id, prev_hashes, _ in latest_ret
            ]

        builder.prev_events = prev_events
        builder.depth = depth

        state_handler = self.state_handler

        context = yield state_handler.compute_event_context(builder)

        if builder.is_state():
            builder.prev_state = yield self.store.add_event_hashes(
                context.prev_state_events
            )

        yield self.auth.add_auth_events(builder, context)

        signing_key = self.hs.config.signing_key[0]
        add_hashes_and_signatures(
            builder, self.server_name, signing_key
        )

        event = builder.build()

        logger.debug(
            "Created event %s with current state: %s",
            event.event_id, context.current_state,
        )

        defer.returnValue(
            (event, context,)
        )

    @defer.inlineCallbacks
    def handle_new_client_event(
        self,
        requester,
        event,
        context,
        ratelimit=True,
        extra_users=[]
    ):
        # We now need to go and hit out to wherever we need to hit out to.

        if ratelimit:
            self.ratelimit(requester)

        try:
            self.auth.check(event, auth_events=context.current_state)
        except AuthError as err:
            logger.warn("Denying new event %r because %s", event, err)
            raise err

        yield self.maybe_kick_guest_users(event, context.current_state.values())

        if event.type == EventTypes.CanonicalAlias:
            # Check the alias is acually valid (at this time at least)
            room_alias_str = event.content.get("alias", None)
            if room_alias_str:
                room_alias = RoomAlias.from_string(room_alias_str)
                directory_handler = self.hs.get_handlers().directory_handler
                mapping = yield directory_handler.get_association(room_alias)

                if mapping["room_id"] != event.room_id:
                    raise SynapseError(
                        400,
                        "Room alias %s does not point to the room" % (
                            room_alias_str,
                        )
                    )

        federation_handler = self.hs.get_handlers().federation_handler

        if event.type == EventTypes.Member:
            if event.content["membership"] == Membership.INVITE:
                def is_inviter_member_event(e):
                    return (
                        e.type == EventTypes.Member and
                        e.sender == event.sender
                    )

                event.unsigned["invite_room_state"] = [
                    {
                        "type": e.type,
                        "state_key": e.state_key,
                        "content": e.content,
                        "sender": e.sender,
                    }
                    for k, e in context.current_state.items()
                    if e.type in self.hs.config.room_invite_state_types
                    or is_inviter_member_event(e)
                ]

                invitee = UserID.from_string(event.state_key)
                if not self.hs.is_mine(invitee):
                    # TODO: Can we add signature from remote server in a nicer
                    # way? If we have been invited by a remote server, we need
                    # to get them to sign the event.

                    returned_invite = yield federation_handler.send_invite(
                        invitee.domain,
                        event,
                    )

                    event.unsigned.pop("room_state", None)

                    # TODO: Make sure the signatures actually are correct.
                    event.signatures.update(
                        returned_invite.signatures
                    )

        if event.type == EventTypes.Redaction:
            if self.auth.check_redaction(event, auth_events=context.current_state):
                original_event = yield self.store.get_event(
                    event.redacts,
                    check_redacted=False,
                    get_prev_content=False,
                    allow_rejected=False,
                    allow_none=False
                )
                if event.user_id != original_event.user_id:
                    raise AuthError(
                        403,
                        "You don't have permission to redact events"
                    )

        if event.type == EventTypes.Create and context.current_state:
            raise AuthError(
                403,
                "Changing the room create event is forbidden",
            )

        action_generator = ActionGenerator(self.hs)
        yield action_generator.handle_push_actions_for_event(
            event, context
        )

        (event_stream_id, max_stream_id) = yield self.store.persist_event(
            event, context=context
        )

        # this intentionally does not yield: we don't care about the result
        # and don't need to wait for it.
        preserve_fn(self.hs.get_pusherpool().on_new_notifications)(
            event_stream_id, max_stream_id
        )

        destinations = set()
        for k, s in context.current_state.items():
            try:
                if k[0] == EventTypes.Member:
                    if s.content["membership"] == Membership.JOIN:
                        destinations.add(get_domain_from_id(s.state_key))
            except SynapseError:
                logger.warn(
                    "Failed to get destination from event %s", s.event_id
                )

        @defer.inlineCallbacks
        def _notify():
            yield run_on_reactor()
            self.notifier.on_new_room_event(
                event, event_stream_id, max_stream_id,
                extra_users=extra_users
            )

        preserve_fn(_notify)()

        # If invite, remove room_state from unsigned before sending.
        event.unsigned.pop("invite_room_state", None)

        federation_handler.handle_new_event(
            event, destinations=destinations,
        )
예제 #7
0
class PaginationHandler(object):
    """Handles pagination and purge history requests.

    These are in the same handler due to the fact we need to block clients
    paginating during a purge.
    """

    def __init__(self, hs):
        self.hs = hs
        self.auth = hs.get_auth()
        self.store = hs.get_datastore()
        self.clock = hs.get_clock()

        self.pagination_lock = ReadWriteLock()
        self._purges_in_progress_by_room = set()
        # map from purge id to PurgeStatus
        self._purges_by_id = {}

    def start_purge_history(self, room_id, token,
                            delete_local_events=False):
        """Start off a history purge on a room.

        Args:
            room_id (str): The room to purge from

            token (str): topological token to delete events before
            delete_local_events (bool): True to delete local events as well as
                remote ones

        Returns:
            str: unique ID for this purge transaction.
        """
        if room_id in self._purges_in_progress_by_room:
            raise SynapseError(
                400,
                "History purge already in progress for %s" % (room_id, ),
            )

        purge_id = random_string(16)

        # we log the purge_id here so that it can be tied back to the
        # request id in the log lines.
        logger.info("[purge] starting purge_id %s", purge_id)

        self._purges_by_id[purge_id] = PurgeStatus()
        run_in_background(
            self._purge_history,
            purge_id, room_id, token, delete_local_events,
        )
        return purge_id

    @defer.inlineCallbacks
    def _purge_history(self, purge_id, room_id, token,
                       delete_local_events):
        """Carry out a history purge on a room.

        Args:
            purge_id (str): The id for this purge
            room_id (str): The room to purge from
            token (str): topological token to delete events before
            delete_local_events (bool): True to delete local events as well as
                remote ones

        Returns:
            Deferred
        """
        self._purges_in_progress_by_room.add(room_id)
        try:
            with (yield self.pagination_lock.write(room_id)):
                yield self.store.purge_history(
                    room_id, token, delete_local_events,
                )
            logger.info("[purge] complete")
            self._purges_by_id[purge_id].status = PurgeStatus.STATUS_COMPLETE
        except Exception:
            logger.error("[purge] failed: %s", Failure().getTraceback().rstrip())
            self._purges_by_id[purge_id].status = PurgeStatus.STATUS_FAILED
        finally:
            self._purges_in_progress_by_room.discard(room_id)

            # remove the purge from the list 24 hours after it completes
            def clear_purge():
                del self._purges_by_id[purge_id]
            self.hs.get_reactor().callLater(24 * 3600, clear_purge)

    def get_purge_status(self, purge_id):
        """Get the current status of an active purge

        Args:
            purge_id (str): purge_id returned by start_purge_history

        Returns:
            PurgeStatus|None
        """
        return self._purges_by_id.get(purge_id)

    @defer.inlineCallbacks
    def get_messages(self, requester, room_id=None, pagin_config=None,
                     as_client_event=True, event_filter=None):
        """Get messages in a room.

        Args:
            requester (Requester): 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.
            as_client_event (bool): True to get events in client-server format.
            event_filter (Filter): Filter to apply to results or None
        Returns:
            dict: Pagination API results
        """
        user_id = requester.user.to_string()

        if pagin_config.from_token:
            room_token = pagin_config.from_token.room_key
        else:
            pagin_config.from_token = (
                yield self.hs.get_event_sources().get_current_token_for_room(
                    room_id=room_id
                )
            )
            room_token = pagin_config.from_token.room_key

        room_token = RoomStreamToken.parse(room_token)

        pagin_config.from_token = pagin_config.from_token.copy_and_replace(
            "room_key", str(room_token)
        )

        source_config = pagin_config.get_source_config("room")

        with (yield self.pagination_lock.read(room_id)):
            membership, member_event_id = yield self.auth.check_in_room_or_world_readable(
                room_id, user_id
            )

            if source_config.direction == 'b':
                # if we're going backwards, we might need to backfill. This
                # requires that we have a topo token.
                if room_token.topological:
                    max_topo = room_token.topological
                else:
                    max_topo = yield self.store.get_max_topological_token(
                        room_id, room_token.stream
                    )

                if membership == Membership.LEAVE:
                    # If they have left the room then clamp the token to be before
                    # they left the room, to save the effort of loading from the
                    # database.
                    leave_token = yield self.store.get_topological_token_for_event(
                        member_event_id
                    )
                    leave_token = RoomStreamToken.parse(leave_token)
                    if leave_token.topological < max_topo:
                        source_config.from_key = str(leave_token)

                yield self.hs.get_handlers().federation_handler.maybe_backfill(
                    room_id, max_topo
                )

            events, next_key = yield self.store.paginate_room_events(
                room_id=room_id,
                from_key=source_config.from_key,
                to_key=source_config.to_key,
                direction=source_config.direction,
                limit=source_config.limit,
                event_filter=event_filter,
            )

            next_token = pagin_config.from_token.copy_and_replace(
                "room_key", next_key
            )

        if not events:
            defer.returnValue({
                "chunk": [],
                "start": pagin_config.from_token.to_string(),
                "end": next_token.to_string(),
            })

        if event_filter:
            events = event_filter.filter(events)

        events = yield filter_events_for_client(
            self.store,
            user_id,
            events,
            is_peeking=(member_event_id is None),
        )

        time_now = self.clock.time_msec()

        chunk = {
            "chunk": [
                serialize_event(e, time_now, as_client_event)
                for e in events
            ],
            "start": pagin_config.from_token.to_string(),
            "end": next_token.to_string(),
        }

        defer.returnValue(chunk)
예제 #8
0
파일: message.py 프로젝트: rubo77/synapse
class MessageHandler(BaseHandler):

    def __init__(self, hs):
        super(MessageHandler, self).__init__(hs)
        self.hs = hs
        self.state = hs.get_state_handler()
        self.clock = hs.get_clock()

        self.pagination_lock = ReadWriteLock()
        self._purges_in_progress_by_room = set()
        # map from purge id to PurgeStatus
        self._purges_by_id = {}

    def start_purge_history(self, room_id, topological_ordering,
                            delete_local_events=False):
        """Start off a history purge on a room.

        Args:
            room_id (str): The room to purge from

            topological_ordering (int): minimum topo ordering to preserve
            delete_local_events (bool): True to delete local events as well as
                remote ones

        Returns:
            str: unique ID for this purge transaction.
        """
        if room_id in self._purges_in_progress_by_room:
            raise SynapseError(
                400,
                "History purge already in progress for %s" % (room_id, ),
            )

        purge_id = random_string(16)

        # we log the purge_id here so that it can be tied back to the
        # request id in the log lines.
        logger.info("[purge] starting purge_id %s", purge_id)

        self._purges_by_id[purge_id] = PurgeStatus()
        run_in_background(
            self._purge_history,
            purge_id, room_id, topological_ordering, delete_local_events,
        )
        return purge_id

    @defer.inlineCallbacks
    def _purge_history(self, purge_id, room_id, topological_ordering,
                       delete_local_events):
        """Carry out a history purge on a room.

        Args:
            purge_id (str): The id for this purge
            room_id (str): The room to purge from
            topological_ordering (int): minimum topo ordering to preserve
            delete_local_events (bool): True to delete local events as well as
                remote ones

        Returns:
            Deferred
        """
        self._purges_in_progress_by_room.add(room_id)
        try:
            with (yield self.pagination_lock.write(room_id)):
                yield self.store.purge_history(
                    room_id, topological_ordering, delete_local_events,
                )
            logger.info("[purge] complete")
            self._purges_by_id[purge_id].status = PurgeStatus.STATUS_COMPLETE
        except Exception:
            logger.error("[purge] failed: %s", Failure().getTraceback().rstrip())
            self._purges_by_id[purge_id].status = PurgeStatus.STATUS_FAILED
        finally:
            self._purges_in_progress_by_room.discard(room_id)

            # remove the purge from the list 24 hours after it completes
            def clear_purge():
                del self._purges_by_id[purge_id]
            reactor.callLater(24 * 3600, clear_purge)

    def get_purge_status(self, purge_id):
        """Get the current status of an active purge

        Args:
            purge_id (str): purge_id returned by start_purge_history

        Returns:
            PurgeStatus|None
        """
        return self._purges_by_id.get(purge_id)

    @defer.inlineCallbacks
    def get_messages(self, requester, room_id=None, pagin_config=None,
                     as_client_event=True, event_filter=None):
        """Get messages in a room.

        Args:
            requester (Requester): 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.
            as_client_event (bool): True to get events in client-server format.
            event_filter (Filter): Filter to apply to results or None
        Returns:
            dict: Pagination API results
        """
        user_id = requester.user.to_string()

        if pagin_config.from_token:
            room_token = pagin_config.from_token.room_key
        else:
            pagin_config.from_token = (
                yield self.hs.get_event_sources().get_current_token_for_room(
                    room_id=room_id
                )
            )
            room_token = pagin_config.from_token.room_key

        room_token = RoomStreamToken.parse(room_token)

        pagin_config.from_token = pagin_config.from_token.copy_and_replace(
            "room_key", str(room_token)
        )

        source_config = pagin_config.get_source_config("room")

        with (yield self.pagination_lock.read(room_id)):
            membership, member_event_id = yield self._check_in_room_or_world_readable(
                room_id, user_id
            )

            if source_config.direction == 'b':
                # if we're going backwards, we might need to backfill. This
                # requires that we have a topo token.
                if room_token.topological:
                    max_topo = room_token.topological
                else:
                    max_topo = yield self.store.get_max_topological_token(
                        room_id, room_token.stream
                    )

                if membership == Membership.LEAVE:
                    # If they have left the room then clamp the token to be before
                    # they left the room, to save the effort of loading from the
                    # database.
                    leave_token = yield self.store.get_topological_token_for_event(
                        member_event_id
                    )
                    leave_token = RoomStreamToken.parse(leave_token)
                    if leave_token.topological < max_topo:
                        source_config.from_key = str(leave_token)

                yield self.hs.get_handlers().federation_handler.maybe_backfill(
                    room_id, max_topo
                )

            events, next_key = yield self.store.paginate_room_events(
                room_id=room_id,
                from_key=source_config.from_key,
                to_key=source_config.to_key,
                direction=source_config.direction,
                limit=source_config.limit,
                event_filter=event_filter,
            )

            next_token = pagin_config.from_token.copy_and_replace(
                "room_key", next_key
            )

        if not events:
            defer.returnValue({
                "chunk": [],
                "start": pagin_config.from_token.to_string(),
                "end": next_token.to_string(),
            })

        if event_filter:
            events = event_filter.filter(events)

        events = yield filter_events_for_client(
            self.store,
            user_id,
            events,
            is_peeking=(member_event_id is None),
        )

        time_now = self.clock.time_msec()

        chunk = {
            "chunk": [
                serialize_event(e, time_now, as_client_event)
                for e in events
            ],
            "start": pagin_config.from_token.to_string(),
            "end": next_token.to_string(),
        }

        defer.returnValue(chunk)

    @defer.inlineCallbacks
    def get_room_data(self, user_id=None, room_id=None,
                      event_type=None, state_key="", is_guest=False):
        """ Get data from a room.

        Args:
            event : The room path event
        Returns:
            The path data content.
        Raises:
            SynapseError if something went wrong.
        """
        membership, membership_event_id = yield self._check_in_room_or_world_readable(
            room_id, user_id
        )

        if membership == Membership.JOIN:
            data = yield self.state_handler.get_current_state(
                room_id, event_type, state_key
            )
        elif membership == Membership.LEAVE:
            key = (event_type, state_key)
            room_state = yield self.store.get_state_for_events(
                [membership_event_id], [key]
            )
            data = room_state[membership_event_id].get(key)

        defer.returnValue(data)

    @defer.inlineCallbacks
    def _check_in_room_or_world_readable(self, room_id, user_id):
        try:
            # check_user_was_in_room will return the most recent membership
            # event for the user if:
            #  * The user is a non-guest user, and was ever in the room
            #  * The user is a guest user, and has joined the room
            # else it will throw.
            member_event = yield self.auth.check_user_was_in_room(room_id, user_id)
            defer.returnValue((member_event.membership, member_event.event_id))
            return
        except AuthError:
            visibility = yield self.state_handler.get_current_state(
                room_id, EventTypes.RoomHistoryVisibility, ""
            )
            if (
                visibility and
                visibility.content["history_visibility"] == "world_readable"
            ):
                defer.returnValue((Membership.JOIN, None))
                return
            raise AuthError(
                403, "Guest access not allowed", errcode=Codes.GUEST_ACCESS_FORBIDDEN
            )

    @defer.inlineCallbacks
    def get_state_events(self, user_id, room_id, is_guest=False):
        """Retrieve all state events for a given room. If the user is
        joined to the room then return the current state. If the user has
        left the room return the state events from when they left.

        Args:
            user_id(str): The user requesting state events.
            room_id(str): The room ID to get all state events from.
        Returns:
            A list of dicts representing state events. [{}, {}, {}]
        """
        membership, membership_event_id = yield self._check_in_room_or_world_readable(
            room_id, user_id
        )

        if membership == Membership.JOIN:
            room_state = yield self.state_handler.get_current_state(room_id)
        elif membership == Membership.LEAVE:
            room_state = yield self.store.get_state_for_events(
                [membership_event_id], None
            )
            room_state = room_state[membership_event_id]

        now = self.clock.time_msec()
        defer.returnValue(
            [serialize_event(c, now) for c in room_state.values()]
        )

    @defer.inlineCallbacks
    def get_joined_members(self, requester, room_id):
        """Get all the joined members in the room and their profile information.

        If the user has left the room return the state events from when they left.

        Args:
            requester(Requester): The user requesting state events.
            room_id(str): The room ID to get all state events from.
        Returns:
            A dict of user_id to profile info
        """
        user_id = requester.user.to_string()
        if not requester.app_service:
            # We check AS auth after fetching the room membership, as it
            # requires us to pull out all joined members anyway.
            membership, _ = yield self._check_in_room_or_world_readable(
                room_id, user_id
            )
            if membership != Membership.JOIN:
                raise NotImplementedError(
                    "Getting joined members after leaving is not implemented"
                )

        users_with_profile = yield self.state.get_current_user_in_room(room_id)

        # If this is an AS, double check that they are allowed to see the members.
        # This can either be because the AS user is in the room or becuase there
        # is a user in the room that the AS is "interested in"
        if requester.app_service and user_id not in users_with_profile:
            for uid in users_with_profile:
                if requester.app_service.is_interested_in_user(uid):
                    break
            else:
                # Loop fell through, AS has no interested users in room
                raise AuthError(403, "Appservice not in room")

        defer.returnValue({
            user_id: {
                "avatar_url": profile.avatar_url,
                "display_name": profile.display_name,
            }
            for user_id, profile in users_with_profile.iteritems()
        })