# -*- coding: utf-8 -*- # Copyright 2015 OpenMarket Ltd # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. from twisted.internet import defer from synapse.api.constants import EventTypes from synapse.api.errors import Codes, StoreError, SynapseError from synapse.appservice import ApplicationService from synapse.types import UserID import synapse.util.stringutils as stringutils import logging logger = logging.getLogger(__name__) # NB: Purposefully not inheriting BaseHandler since that contains way too much # setup code which this handler does not need or use. This makes testing a lot # easier. class ApplicationServicesHandler(object): def __init__(self, hs, appservice_api): self.store = hs.get_datastore() self.hs = hs self.appservice_api = appservice_api @defer.inlineCallbacks def register(self, app_service): logger.info("Register -> %s", app_service) # check the token is recognised try: stored_service = yield self.store.get_app_service_by_token( app_service.token ) if not stored_service: raise StoreError(404, "Application service not found") except StoreError: raise SynapseError( 403, "Unrecognised application services token. " "Consult the home server admin.", errcode=Codes.FORBIDDEN ) app_service.hs_token = self._generate_hs_token() # create a sender for this application service which is used when # creating rooms, etc.. account = yield self.hs.get_handlers().registration_handler.register() app_service.sender = account[0] yield self.store.update_app_service(app_service) defer.returnValue(app_service) @defer.inlineCallbacks def unregister(self, token): logger.info("Unregister as_token=%s", token) yield self.store.unregister_app_service(token) @defer.inlineCallbacks def notify_interested_services(self, event): """Notifies (pushes) all application services interested in this event. Pushing is done asynchronously, so this method won't block for any prolonged length of time. Args: event(Event): The event to push out to interested services. """ # Gather interested services services = yield self._get_services_for_event(event) if len(services) == 0: return # no services need notifying # Do we know this user exists? If not, poke the user query API for # all services which match that user regex. This needs to block as these # user queries need to be made BEFORE pushing the event. yield self._check_user_exists(event.sender) if event.type == EventTypes.Member: yield self._check_user_exists(event.state_key) # Fork off pushes to these services - XXX First cut, best effort for service in services: self.appservice_api.push(service, event) @defer.inlineCallbacks def query_user_exists(self, user_id): """Check if any application service knows this user_id exists. Args: user_id(str): The user to query if they exist on any AS. Returns: True if this user exists on at least one application service. """ user_query_services = yield self._get_services_for_user( user_id=user_id ) for user_service in user_query_services: is_known_user = yield self.appservice_api.query_user( user_service, user_id ) if is_known_user: defer.returnValue(True) defer.returnValue(False) @defer.inlineCallbacks def query_room_alias_exists(self, room_alias): """Check if an application service knows this room alias exists. Args: room_alias(RoomAlias): The room alias to query. Returns: namedtuple: with keys "room_id" and "servers" or None if no association can be found. """ room_alias = room_alias.to_string() alias_query_services = yield self._get_services_for_event( event=None, restrict_to=ApplicationService.NS_ALIASES, alias_list=[room_alias] ) for alias_service in alias_query_services: is_known_alias = yield self.appservice_api.query_alias( alias_service, room_alias ) if is_known_alias: # the alias exists now so don't query more ASes. result = yield self.store.get_association_from_room_alias( room_alias ) defer.returnValue(result) @defer.inlineCallbacks def _get_services_for_event(self, event, restrict_to="", alias_list=None): """Retrieve a list of application services interested in this event. Args: event(Event): The event to check. Can be None if alias_list is not. restrict_to(str): The namespace to restrict regex tests to. alias_list: A list of aliases to get services for. If None, this list is obtained from the database. Returns: list: A list of services interested in this event based on the service regex. """ # We need to know the aliases associated with this event.room_id, if any if not alias_list: alias_list = yield self.store.get_aliases_for_room(event.room_id) services = yield self.store.get_app_services() interested_list = [ s for s in services if ( s.is_interested(event, restrict_to, alias_list) ) ] defer.returnValue(interested_list) @defer.inlineCallbacks def _get_services_for_user(self, user_id): services = yield self.store.get_app_services() interested_list = [ s for s in services if ( s.is_interested_in_user(user_id) ) ] defer.returnValue(interested_list) @defer.inlineCallbacks def _is_unknown_user(self, user_id): user = UserID.from_string(user_id) if not self.hs.is_mine(user): # we don't know if they are unknown or not since it isn't one of our # users. We can't poke ASes. defer.returnValue(False) return user_info = yield self.store.get_user_by_id(user_id) defer.returnValue(len(user_info) == 0) @defer.inlineCallbacks def _check_user_exists(self, user_id): unknown_user = yield self._is_unknown_user(user_id) if unknown_user: exists = yield self.query_user_exists(user_id) defer.returnValue(exists) defer.returnValue(True) def _generate_hs_token(self): return stringutils.random_string(24)