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