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# -*- coding: utf-8 -*-
# Copyright 2018 New Vector 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.
import logging
from twisted.internet import defer
from synapse.api.constants import EventTypes, Membership, RoomCreationPreset
from synapse.types import create_requester
from synapse.util.caches.descriptors import cachedInlineCallbacks
logger = logging.getLogger(__name__)
class ServerNoticesManager(object):
def __init__(self, hs):
"""
Args:
hs (synapse.server.HomeServer):
"""
self._store = hs.get_datastore()
self._config = hs.config
self._room_creation_handler = hs.get_room_creation_handler()
self._event_creation_handler = hs.get_event_creation_handler()
def is_enabled(self):
"""Checks if server notices are enabled on this server.
Returns:
bool
"""
return self._config.server_notices_mxid is not None
@defer.inlineCallbacks
def send_notice(self, user_id, event_content):
"""Send a notice to the given user
Creates the server notices room, if none exists.
Args:
user_id (str): mxid of user to send event to.
event_content (dict): content of event to send
Returns:
Deferrred[None]
"""
room_id = yield self.get_notice_room_for_user(user_id)
system_mxid = self._config.server_notices_mxid
requester = create_requester(system_mxid)
logger.info("Sending server notice to %s", user_id)
yield self._event_creation_handler.create_and_send_nonmember_event(
requester, {
"type": EventTypes.Message,
"room_id": room_id,
"sender": system_mxid,
"content": event_content,
},
ratelimit=False,
)
@cachedInlineCallbacks()
def get_notice_room_for_user(self, user_id):
"""Get the room for notices for a given user
If we have not yet created a notice room for this user, create it
Args:
user_id (str): complete user id for the user we want a room for
Returns:
str: room id of notice room.
"""
if not self.is_enabled():
raise Exception("Server notices not enabled")
rooms = yield self._store.get_rooms_for_user_where_membership_is(
user_id, [Membership.INVITE, Membership.JOIN],
)
system_mxid = self._config.server_notices_mxid
for room in rooms:
# it's worth noting that there is an asymmetry here in that we
# expect the user to be invited or joined, but the system user must
# be joined. This is kinda deliberate, in that if somebody somehow
# manages to invite the system user to a room, that doesn't make it
# the server notices room.
user_ids = yield self._store.get_users_in_room(room.room_id)
if system_mxid in user_ids:
# we found a room which our user shares with the system notice
# user
logger.info("Using room %s", room.room_id)
defer.returnValue(room.room_id)
# apparently no existing notice room: create a new one
logger.info("Creating server notices room for %s", user_id)
requester = create_requester(system_mxid)
info = yield self._room_creation_handler.create_room(
requester,
config={
"preset": RoomCreationPreset.PRIVATE_CHAT,
"name": self._config.server_notices_room_name,
"power_level_content_override": {
"users_default": -10,
},
"invite": (user_id,)
},
ratelimit=False,
creator_join_profile={
"displayname": self._config.server_notices_mxid_display_name,
},
)
room_id = info['room_id']
logger.info("Created server notices room %s for %s", room_id, user_id)
defer.returnValue(room_id)
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