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# -*- coding: utf-8 -*-
# Copyright 2021 The Matrix.org Foundation C.I.C.
#
# 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 itertools
import logging
from collections import deque
from typing import TYPE_CHECKING, Iterable, List, Optional, Set
from synapse.api.constants import EventContentFields, EventTypes, HistoryVisibility
from synapse.api.errors import AuthError
from synapse.events import EventBase
from synapse.events.utils import format_event_for_client_v2
from synapse.types import JsonDict
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
# number of rooms to return. We'll stop once we hit this limit.
# TODO: allow clients to reduce this with a request param.
MAX_ROOMS = 50
# max number of events to return per room.
MAX_ROOMS_PER_SPACE = 50
class SpaceSummaryHandler:
def __init__(self, hs: "HomeServer"):
self._clock = hs.get_clock()
self._auth = hs.get_auth()
self._room_list_handler = hs.get_room_list_handler()
self._state_handler = hs.get_state_handler()
self._store = hs.get_datastore()
self._event_serializer = hs.get_event_client_serializer()
async def get_space_summary(
self,
requester: str,
room_id: str,
suggested_only: bool = False,
max_rooms_per_space: Optional[int] = None,
) -> JsonDict:
"""
Implementation of the space summary API
Args:
requester: user id of the user making this request
room_id: room id to start the summary at
suggested_only: whether we should only return children with the "suggested"
flag set.
max_rooms_per_space: an optional limit on the number of child rooms we will
return. This does not apply to the root room (ie, room_id), and
is overridden by ROOMS_PER_SPACE_LIMIT.
Returns:
summary dict to return
"""
# first of all, check that the user is in the room in question (or it's
# world-readable)
await self._auth.check_user_in_room_or_world_readable(room_id, requester)
# the queue of rooms to process
room_queue = deque((room_id,))
processed_rooms = set() # type: Set[str]
rooms_result = [] # type: List[JsonDict]
events_result = [] # type: List[JsonDict]
now = self._clock.time_msec()
while room_queue and len(rooms_result) < MAX_ROOMS:
room_id = room_queue.popleft()
logger.debug("Processing room %s", room_id)
processed_rooms.add(room_id)
try:
await self._auth.check_user_in_room_or_world_readable(
room_id, requester
)
except AuthError:
logger.info(
"user %s cannot view room %s, omitting from summary",
requester,
room_id,
)
continue
room_entry = await self._build_room_entry(room_id)
rooms_result.append(room_entry)
# look for child rooms/spaces.
child_events = await self._get_child_events(room_id)
if suggested_only:
# we only care about suggested children
child_events = filter(_is_suggested_child_event, child_events)
# The client-specified max_rooms_per_space limit doesn't apply to the
# room_id specified in the request, so we ignore it if this is the
# first room we are processing. Otherwise, apply any client-specified
# limit, capping to our built-in limit.
if max_rooms_per_space is not None and len(processed_rooms) > 1:
max_rooms = min(MAX_ROOMS_PER_SPACE, max_rooms_per_space)
else:
max_rooms = MAX_ROOMS_PER_SPACE
for edge_event in itertools.islice(child_events, max_rooms):
edge_room_id = edge_event.state_key
events_result.append(
await self._event_serializer.serialize_event(
edge_event,
time_now=now,
event_format=format_event_for_client_v2,
)
)
# if we haven't yet visited the target of this link, add it to the queue
if edge_room_id not in processed_rooms:
room_queue.append(edge_room_id)
return {"rooms": rooms_result, "events": events_result}
async def _build_room_entry(self, room_id: str) -> JsonDict:
"""Generate en entry suitable for the 'rooms' list in the summary response"""
stats = await self._store.get_room_with_stats(room_id)
# currently this should be impossible because we call
# check_user_in_room_or_world_readable on the room before we get here, so
# there should always be an entry
assert stats is not None, "unable to retrieve stats for %s" % (room_id,)
current_state_ids = await self._store.get_current_state_ids(room_id)
create_event = await self._store.get_event(
current_state_ids[(EventTypes.Create, "")]
)
# TODO: update once MSC1772 lands
room_type = create_event.content.get(EventContentFields.MSC1772_ROOM_TYPE)
entry = {
"room_id": stats["room_id"],
"name": stats["name"],
"topic": stats["topic"],
"canonical_alias": stats["canonical_alias"],
"num_joined_members": stats["joined_members"],
"avatar_url": stats["avatar"],
"world_readable": (
stats["history_visibility"] == HistoryVisibility.WORLD_READABLE
),
"guest_can_join": stats["guest_access"] == "can_join",
"room_type": room_type,
}
# Filter out Nones – rather omit the field altogether
room_entry = {k: v for k, v in entry.items() if v is not None}
return room_entry
async def _get_child_events(self, room_id: str) -> Iterable[EventBase]:
# look for child rooms/spaces.
current_state_ids = await self._store.get_current_state_ids(room_id)
events = await self._store.get_events_as_list(
[
event_id
for key, event_id in current_state_ids.items()
# TODO: update once MSC1772 lands
if key[0] == EventTypes.MSC1772_SPACE_CHILD
]
)
# filter out any events without a "via" (which implies it has been redacted)
return (e for e in events if e.content.get("via"))
def _is_suggested_child_event(edge_event: EventBase) -> bool:
suggested = edge_event.content.get("suggested")
if isinstance(suggested, bool) and suggested:
return True
logger.debug("Ignorning not-suggested child %s", edge_event.state_key)
return False
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