196 lines
7.0 KiB
Python
196 lines
7.0 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015, 2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from twisted.internet import defer
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from synapse.api.constants import EventTypes
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from synapse.appservice import ApplicationService
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from synapse.types import UserID
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import logging
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logger = logging.getLogger(__name__)
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def log_failure(failure):
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logger.error(
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"Application Services Failure",
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exc_info=(
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failure.type,
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failure.value,
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failure.getTracebackObject()
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)
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)
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# NB: Purposefully not inheriting BaseHandler since that contains way too much
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# setup code which this handler does not need or use. This makes testing a lot
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# easier.
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class ApplicationServicesHandler(object):
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def __init__(self, hs, appservice_api, appservice_scheduler):
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self.store = hs.get_datastore()
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self.hs = hs
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self.appservice_api = appservice_api
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self.scheduler = appservice_scheduler
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self.started_scheduler = False
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@defer.inlineCallbacks
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def notify_interested_services(self, event):
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"""Notifies (pushes) all application services interested in this event.
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Pushing is done asynchronously, so this method won't block for any
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prolonged length of time.
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Args:
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event(Event): The event to push out to interested services.
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"""
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# Gather interested services
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services = yield self._get_services_for_event(event)
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if len(services) == 0:
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return # no services need notifying
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# Do we know this user exists? If not, poke the user query API for
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# all services which match that user regex. This needs to block as these
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# user queries need to be made BEFORE pushing the event.
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yield self._check_user_exists(event.sender)
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if event.type == EventTypes.Member:
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yield self._check_user_exists(event.state_key)
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if not self.started_scheduler:
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self.scheduler.start().addErrback(log_failure)
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self.started_scheduler = True
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# Fork off pushes to these services
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for service in services:
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self.scheduler.submit_event_for_as(service, event)
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@defer.inlineCallbacks
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def query_user_exists(self, user_id):
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"""Check if any application service knows this user_id exists.
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Args:
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user_id(str): The user to query if they exist on any AS.
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Returns:
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True if this user exists on at least one application service.
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"""
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user_query_services = yield self._get_services_for_user(
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user_id=user_id
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)
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for user_service in user_query_services:
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is_known_user = yield self.appservice_api.query_user(
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user_service, user_id
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)
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if is_known_user:
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defer.returnValue(True)
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defer.returnValue(False)
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@defer.inlineCallbacks
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def query_room_alias_exists(self, room_alias):
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"""Check if an application service knows this room alias exists.
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Args:
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room_alias(RoomAlias): The room alias to query.
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Returns:
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namedtuple: with keys "room_id" and "servers" or None if no
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association can be found.
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"""
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room_alias_str = room_alias.to_string()
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alias_query_services = yield self._get_services_for_event(
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event=None,
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restrict_to=ApplicationService.NS_ALIASES,
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alias_list=[room_alias_str]
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)
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for alias_service in alias_query_services:
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is_known_alias = yield self.appservice_api.query_alias(
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alias_service, room_alias_str
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)
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if is_known_alias:
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# the alias exists now so don't query more ASes.
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result = yield self.store.get_association_from_room_alias(
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room_alias
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)
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defer.returnValue(result)
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@defer.inlineCallbacks
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def _get_services_for_event(self, event, restrict_to="", alias_list=None):
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"""Retrieve a list of application services interested in this event.
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Args:
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event(Event): The event to check. Can be None if alias_list is not.
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restrict_to(str): The namespace to restrict regex tests to.
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alias_list: A list of aliases to get services for. If None, this
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list is obtained from the database.
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Returns:
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list<ApplicationService>: A list of services interested in this
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event based on the service regex.
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"""
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member_list = None
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if hasattr(event, "room_id"):
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# We need to know the aliases associated with this event.room_id,
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# if any.
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if not alias_list:
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alias_list = yield self.store.get_aliases_for_room(
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event.room_id
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)
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# We need to know the members associated with this event.room_id,
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# if any.
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member_list = yield self.store.get_users_in_room(event.room_id)
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services = yield self.store.get_app_services()
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interested_list = [
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s for s in services if (
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s.is_interested(event, restrict_to, alias_list, member_list)
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)
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]
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defer.returnValue(interested_list)
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@defer.inlineCallbacks
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def _get_services_for_user(self, user_id):
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services = yield self.store.get_app_services()
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interested_list = [
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s for s in services if (
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s.is_interested_in_user(user_id)
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)
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]
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defer.returnValue(interested_list)
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@defer.inlineCallbacks
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def _is_unknown_user(self, user_id):
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user = UserID.from_string(user_id)
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if not self.hs.is_mine(user):
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# we don't know if they are unknown or not since it isn't one of our
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# users. We can't poke ASes.
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defer.returnValue(False)
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return
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user_info = yield self.store.get_user_by_id(user_id)
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if user_info:
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defer.returnValue(False)
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return
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# user not found; could be the AS though, so check.
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services = yield self.store.get_app_services()
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service_list = [s for s in services if s.sender == user_id]
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defer.returnValue(len(service_list) == 0)
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@defer.inlineCallbacks
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def _check_user_exists(self, user_id):
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unknown_user = yield self._is_unknown_user(user_id)
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if unknown_user:
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exists = yield self.query_user_exists(user_id)
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defer.returnValue(exists)
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defer.returnValue(True)
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