@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)

        self.auth.check(event, auth_events=context.current_state)

        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 self.hs.config.room_invite_state_types in e.type
                    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, self
        )

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

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

        with PreserveLoggingContext():
            # Don't block waiting on waking up all the listeners.
            self.notifier.on_new_room_event(
                event, event_stream_id, max_stream_id,
                extra_users=extra_users
            )

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

        federation_handler.handle_new_event(
            event, destinations=destinations,
        )
dataset/ETHPy150Open matrix-org/synapse/synapse/handlers/_base.py/BaseHandler.handle_new_client_event/swapped operands of `in`