import logging from diskcache import Cache from nio import ( AsyncClient, InviteMemberEvent, JoinError, KeyVerificationCancel, KeyVerificationKey, KeyVerificationMac, KeyVerificationStart, LocalProtocolError, MatrixRoom, MegolmEvent, RedactionEvent, RoomGetEventError, RoomMessageText, SendRetryError, ToDeviceError, UnknownEvent, ) from matrix_alertbot.alertmanager import AlertmanagerClient from matrix_alertbot.chat_functions import strip_fallback from matrix_alertbot.command import AckAlertCommand, CommandFactory, UnackAlertCommand from matrix_alertbot.config import Config logger = logging.getLogger(__name__) class Callbacks: def __init__( self, matrix_client: AsyncClient, alertmanager_client: AlertmanagerClient, cache: Cache, config: Config, ): """ Args: client: nio client used to interact with matrix. cache: Bot cache. alertmanager: Client used to interact with alertmanager. config: Bot configuration parameters. """ self.matrix_client = matrix_client self.cache = cache self.alertmanager_client = alertmanager_client self.config = config self.command_prefix = config.command_prefix async def message(self, room: MatrixRoom, event: RoomMessageText) -> None: """Callback for when a message event is received Args: room: The room the event came from. event: The event defining the message. """ # Ignore messages from ourselves if event.sender == self.matrix_client.user: return # Ignore messages from unauthorized room if room.room_id not in self.config.allowed_rooms: return # Extract the message text msg = strip_fallback(event.body) logger.debug( f"Bot message received for room {room.display_name} | " f"{room.user_name(event.sender)}: {msg}" ) # Process as message if in a public room without command prefix has_command_prefix = msg.startswith(self.command_prefix) if not has_command_prefix: logger.debug( f"Cannot process message: Command prefix {self.command_prefix} not provided." ) return source_content = event.source["content"] reacted_to_event_id = ( source_content.get("m.relates_to", {}) .get("m.in_reply_to", {}) .get("event_id") ) if reacted_to_event_id is not None: logger.debug(f"Command in reply to event ID {reacted_to_event_id}") # Remove the command prefix cmd = msg[len(self.command_prefix) :] try: command = CommandFactory.create( cmd, self.matrix_client, self.cache, self.alertmanager_client, self.config, room, event.sender, event.event_id, reacted_to_event_id, ) except TypeError as e: logging.error(f"Cannot process command '{cmd}': {e}") return try: await command.process() except (SendRetryError, LocalProtocolError) as e: logger.exception(f"Unable to send message to {room.room_id}", exc_info=e) async def invite(self, room: MatrixRoom, event: InviteMemberEvent) -> None: """Callback for when an invite is received. Join the room specified in the invite. Args: room: The room that we are invited to. event: The invite event. """ # Ignore invites from unauthorized room if room.room_id not in self.config.allowed_rooms: return logger.debug(f"Got invite to {room.room_id} from {event.sender}.") # Attempt to join 3 times before giving up for attempt in range(3): result = await self.matrix_client.join(room.room_id) if type(result) == JoinError: logger.error( f"Error joining room {room.room_id} (attempt %d): %s", attempt, result.message, ) else: break else: logger.error("Unable to join room: %s", room.room_id) # Successfully joined room logger.info(f"Joined {room.room_id}") async def invite_event_filtered_callback( self, room: MatrixRoom, event: InviteMemberEvent ) -> None: """ Since the InviteMemberEvent is fired for every m.room.member state received in a sync response's `rooms.invite` section, we will receive some that are not actually our own invite event (such as the inviter's membership). This makes sure we only call `callbacks.invite` with our own invite events. """ if event.state_key == self.matrix_client.user_id: # This is our own membership (invite) event await self.invite(room, event) async def _reaction( self, room: MatrixRoom, event: UnknownEvent, alert_event_id: str ) -> None: """A reaction was sent to one of our messages. Let's send a reply acknowledging it. Args: room: The room the reaction was sent in. event: The reaction event. reacted_to_id: The event ID that the reaction points to. """ # Ignore reactions from unauthorized room if room.room_id not in self.config.allowed_rooms: return # Ignore reactions from ourselves if event.sender == self.matrix_client.user: return reaction = event.source.get("content", {}).get("m.relates_to", {}).get("key") logger.debug(f"Got reaction {reaction} to {room.room_id} from {event.sender}.") if reaction not in self.config.allowed_reactions: logger.warning(f"Uknown duration reaction {reaction}") return # Get the original event that was reacted to event_response = await self.matrix_client.room_get_event( room.room_id, alert_event_id ) if isinstance(event_response, RoomGetEventError): logger.warning( f"Error getting event that was reacted to ({alert_event_id})" ) return reacted_to_event = event_response.event # Only acknowledge reactions to events that we sent if reacted_to_event.sender != self.config.user_id: return # Send a message acknowledging the reaction command = AckAlertCommand( self.matrix_client, self.cache, self.alertmanager_client, self.config, room, event.sender, event.event_id, alert_event_id, ) try: await command.process() except (SendRetryError, LocalProtocolError) as e: logger.exception(f"Unable to send message to {room.room_id}", exc_info=e) async def redaction(self, room: MatrixRoom, event: RedactionEvent) -> None: # Ignore events from unauthorized room if room.room_id not in self.config.allowed_rooms: return # Ignore redactions from ourselves if event.sender == self.matrix_client.user: return logger.debug(f"Received event to remove event ID {event.redacts}") command = UnackAlertCommand( self.matrix_client, self.cache, self.alertmanager_client, self.config, room, event.sender, event.event_id, event.redacts, ) try: await command.process() except (SendRetryError, LocalProtocolError) as e: logger.exception(f"Unable to send message to {room.room_id}", exc_info=e) async def decryption_failure(self, room: MatrixRoom, event: MegolmEvent) -> None: """Callback for when an event fails to decrypt. Inform the user. Args: room: The room that the event that we were unable to decrypt is in. event: The encrypted event that we were unable to decrypt. """ # Ignore events from unauthorized room if room.room_id not in self.config.allowed_rooms: return logger.error( f"Failed to decrypt event '{event.event_id}' in room '{room.room_id}'!" f"\n\n" f"Tip: try using a different device ID in your config file and restart." f"\n\n" f"If all else fails, delete your store directory and let the bot recreate " f"it (your reminders will NOT be deleted, but the bot may respond to existing " f"commands a second time)." ) async def key_verification_start(self, event: KeyVerificationStart): """Callback for when somebody wants to verify our devices.""" if "emoji" not in event.short_authentication_string: logger.error( f"Unable to use emoji verification with {event.sender} on device {event.from_device}." ) return event_response = await self.matrix_client.accept_key_verification( event.transaction_id ) if isinstance(event_response, ToDeviceError): logger.error( f"Unable to start key verification with {event.sender} on device {event.from_device}, got error: {event_response}." ) return sas = self.matrix_client.key_verifications[event.transaction_id] todevice_msg = sas.share_key() event_response = await self.matrix_client.to_device(todevice_msg) if isinstance(event_response, ToDeviceError): logger.error( f"Unable to share key with {event.sender} on device {event.from_device}, got error: {event_response}." ) return async def key_verification_cancel(self, event: KeyVerificationCancel): # There is no need to issue a # client.cancel_key_verification(tx_id, reject=False) # here. The SAS flow is already cancelled. # We only need to inform the user. logger.info( f"Verification has been cancelled by {event.sender} for reason: {event.reason}." ) async def key_verification_accept(self, event: KeyVerificationKey): sas = self.matrix_client.key_verifications[event.transaction_id] emoji_list = sas.get_emoji() emoji_str = " ".join(emoji for emoji, alt_text in emoji_list) logger.info( f"Received request to verify emojis from {event.sender}: {emoji_str}" ) event_response = await self.matrix_client.confirm_short_auth_string( event.transaction_id ) if isinstance(event_response, ToDeviceError): logger.error( f"Unable to confirm emoji verification with {event.sender}, got error: {event_response}." ) # FIXME: We should allow manual cancel or reject # event_response = await self.matrix_client.cancel_key_verification( # event.transaction_id, reject=True # ) # if isinstance(event_response, ToDeviceError): # logger.error( # f"Unable to reject emoji verification with {event.sender}, got error: {event_response}." # ) # # event_response = await self.matrix_client.cancel_key_verification( # event.transaction_id, reject=False # ) # if isinstance(event_response, ToDeviceError): # logger.error( # f"Unable to cancel emoji verification with {event.sender}, got error: {event_response}." # ) async def key_verification_end(self, event: KeyVerificationMac): sas = self.matrix_client.key_verifications[event.transaction_id] try: todevice_msg = sas.get_mac() except LocalProtocolError as e: # e.g. it might have been cancelled by ourselves logger.warn(f"Unable to conclude verification with {event.sender}: {e}.") return event_response = await self.matrix_client.to_device(todevice_msg) if isinstance(event_response, ToDeviceError): logger.error( f"Unable to conclude verification with {event.sender}, got error: {event_response}." ) return verified_devices = " ".join(sas.verified_devices) logger.info( f"Successfully verified devices from {event.sender}: {verified_devices}" ) async def unknown(self, room: MatrixRoom, event: UnknownEvent) -> None: """Callback for when an event with a type that is unknown to matrix-nio is received. Currently this is used for reaction events, which are not yet part of a released matrix spec (and are thus unknown to nio). Args: room: The room the reaction was sent in. event: The event itself. """ # Ignore events from unauthorized room if room.room_id not in self.config.allowed_rooms: return if event.type == "m.reaction": # Get the ID of the event this was a reaction to relation_dict = event.source.get("content", {}).get("m.relates_to", {}) reacted_to_id = relation_dict.get("event_id") if reacted_to_id and relation_dict.get("rel_type") == "m.annotation": await self._reaction(room, event, reacted_to_id) return logger.debug( f"Got unknown event with type to {event.type} from {event.sender} in {room.room_id}." )