201 lines
7.1 KiB
Python
201 lines
7.1 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2018 New Vector 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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import logging
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from typing import Optional
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from synapse.api.constants import EventTypes, Membership, RoomCreationPreset
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from synapse.events import EventBase
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from synapse.types import UserID, create_requester
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from synapse.util.caches.descriptors import cached
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logger = logging.getLogger(__name__)
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SERVER_NOTICE_ROOM_TAG = "m.server_notice"
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class ServerNoticesManager:
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def __init__(self, hs):
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"""
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Args:
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hs (synapse.server.HomeServer):
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"""
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self._store = hs.get_datastore()
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self._config = hs.config
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self._room_creation_handler = hs.get_room_creation_handler()
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self._room_member_handler = hs.get_room_member_handler()
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self._event_creation_handler = hs.get_event_creation_handler()
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self._is_mine_id = hs.is_mine_id
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self._server_name = hs.hostname
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self._notifier = hs.get_notifier()
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self.server_notices_mxid = self._config.server_notices_mxid
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def is_enabled(self):
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"""Checks if server notices are enabled on this server.
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Returns:
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bool
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"""
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return self._config.server_notices_mxid is not None
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async def send_notice(
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self,
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user_id: str,
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event_content: dict,
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type: str = EventTypes.Message,
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state_key: Optional[bool] = None,
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) -> EventBase:
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"""Send a notice to the given user
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Creates the server notices room, if none exists.
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Args:
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user_id: mxid of user to send event to.
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event_content: content of event to send
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type: type of event
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is_state_event: Is the event a state event
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"""
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room_id = await self.get_or_create_notice_room_for_user(user_id)
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await self.maybe_invite_user_to_room(user_id, room_id)
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system_mxid = self._config.server_notices_mxid
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requester = create_requester(
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system_mxid, authenticated_entity=self._server_name
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)
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logger.info("Sending server notice to %s", user_id)
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event_dict = {
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"type": type,
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"room_id": room_id,
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"sender": system_mxid,
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"content": event_content,
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}
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if state_key is not None:
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event_dict["state_key"] = state_key
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event, _ = await self._event_creation_handler.create_and_send_nonmember_event(
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requester, event_dict, ratelimit=False
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)
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return event
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@cached()
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async def get_or_create_notice_room_for_user(self, user_id: str) -> str:
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"""Get the room for notices for a given user
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If we have not yet created a notice room for this user, create it, but don't
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invite the user to it.
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Args:
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user_id: complete user id for the user we want a room for
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Returns:
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room id of notice room.
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"""
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if not self.is_enabled():
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raise Exception("Server notices not enabled")
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assert self._is_mine_id(user_id), "Cannot send server notices to remote users"
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rooms = await self._store.get_rooms_for_local_user_where_membership_is(
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user_id, [Membership.INVITE, Membership.JOIN]
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)
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for room in rooms:
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# it's worth noting that there is an asymmetry here in that we
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# expect the user to be invited or joined, but the system user must
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# be joined. This is kinda deliberate, in that if somebody somehow
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# manages to invite the system user to a room, that doesn't make it
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# the server notices room.
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user_ids = await self._store.get_users_in_room(room.room_id)
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if len(user_ids) <= 2 and self.server_notices_mxid in user_ids:
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# we found a room which our user shares with the system notice
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# user
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logger.info(
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"Using existing server notices room %s for user %s",
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room.room_id,
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user_id,
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)
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return room.room_id
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# apparently no existing notice room: create a new one
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logger.info("Creating server notices room for %s", user_id)
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# see if we want to override the profile info for the server user.
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# note that if we want to override either the display name or the
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# avatar, we have to use both.
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join_profile = None
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if (
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self._config.server_notices_mxid_display_name is not None
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or self._config.server_notices_mxid_avatar_url is not None
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):
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join_profile = {
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"displayname": self._config.server_notices_mxid_display_name,
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"avatar_url": self._config.server_notices_mxid_avatar_url,
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}
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requester = create_requester(
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self.server_notices_mxid, authenticated_entity=self._server_name
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)
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info, _ = await self._room_creation_handler.create_room(
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requester,
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config={
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"preset": RoomCreationPreset.PRIVATE_CHAT,
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"name": self._config.server_notices_room_name,
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"power_level_content_override": {"users_default": -10},
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},
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ratelimit=False,
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creator_join_profile=join_profile,
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)
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room_id = info["room_id"]
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max_id = await self._store.add_tag_to_room(
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user_id, room_id, SERVER_NOTICE_ROOM_TAG, {}
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)
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self._notifier.on_new_event("account_data_key", max_id, users=[user_id])
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logger.info("Created server notices room %s for %s", room_id, user_id)
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return room_id
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async def maybe_invite_user_to_room(self, user_id: str, room_id: str) -> None:
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"""Invite the given user to the given server room, unless the user has already
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joined or been invited to it.
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Args:
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user_id: The ID of the user to invite.
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room_id: The ID of the room to invite the user to.
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"""
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requester = create_requester(
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self.server_notices_mxid, authenticated_entity=self._server_name
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)
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# Check whether the user has already joined or been invited to this room. If
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# that's the case, there is no need to re-invite them.
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joined_rooms = await self._store.get_rooms_for_local_user_where_membership_is(
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user_id, [Membership.INVITE, Membership.JOIN]
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)
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for room in joined_rooms:
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if room.room_id == room_id:
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return
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await self._room_member_handler.update_membership(
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requester=requester,
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target=UserID.from_string(user_id),
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room_id=room_id,
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action="invite",
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)
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