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Initial spaces summary API (#9643)

This is very bare-bones for now: federation will come soon, while pagination is descoped for now but will come later.
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Richard van der Hoff 2021-03-18 18:24:16 +00:00 committed by GitHub
parent 8dd2ea65a9
commit 004234f03a
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6 changed files with 277 additions and 3 deletions

1
changelog.d/9643.feature Normal file
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@ -0,0 +1 @@
Add initial experimental support for a "space summary" API.

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@ -100,6 +100,9 @@ class EventTypes:
Dummy = "org.matrix.dummy_event"
MSC1772_SPACE_CHILD = "org.matrix.msc1772.space.child"
MSC1772_SPACE_PARENT = "org.matrix.msc1772.space.parent"
class EduTypes:
Presence = "m.presence"
@ -160,6 +163,9 @@ class EventContentFields:
# cf https://github.com/matrix-org/matrix-doc/pull/2228
SELF_DESTRUCT_AFTER = "org.matrix.self_destruct_after"
# cf https://github.com/matrix-org/matrix-doc/pull/1772
MSC1772_ROOM_TYPE = "org.matrix.msc1772.type"
class RoomEncryptionAlgorithms:
MEGOLM_V1_AES_SHA2 = "m.megolm.v1.aes-sha2"

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@ -27,3 +27,6 @@ class ExperimentalConfig(Config):
# MSC2858 (multiple SSO identity providers)
self.msc2858_enabled = experimental.get("msc2858_enabled", False) # type: bool
# Spaces (MSC1772, MSC2946, etc)
self.spaces_enabled = experimental.get("spaces_enabled", False) # type: bool

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@ -0,0 +1,199 @@
# -*- 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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@ -18,9 +18,11 @@
import logging
import re
from typing import TYPE_CHECKING, List, Optional
from typing import TYPE_CHECKING, List, Optional, Tuple
from urllib import parse as urlparse
from twisted.web.server import Request
from synapse.api.constants import EventTypes, Membership
from synapse.api.errors import (
AuthError,
@ -35,6 +37,7 @@ from synapse.events.utils import format_event_for_client_v2
from synapse.http.servlet import (
RestServlet,
assert_params_in_dict,
parse_boolean,
parse_integer,
parse_json_object_from_request,
parse_string,
@ -44,7 +47,14 @@ from synapse.rest.client.transactions import HttpTransactionCache
from synapse.rest.client.v2_alpha._base import client_patterns
from synapse.storage.state import StateFilter
from synapse.streams.config import PaginationConfig
from synapse.types import RoomAlias, RoomID, StreamToken, ThirdPartyInstanceID, UserID
from synapse.types import (
JsonDict,
RoomAlias,
RoomID,
StreamToken,
ThirdPartyInstanceID,
UserID,
)
from synapse.util import json_decoder
from synapse.util.stringutils import parse_and_validate_server_name, random_string
@ -987,7 +997,54 @@ def register_txn_path(servlet, regex_string, http_server, with_get=False):
)
def register_servlets(hs, http_server, is_worker=False):
class RoomSpaceSummaryRestServlet(RestServlet):
PATTERNS = (
re.compile(
"^/_matrix/client/unstable/org.matrix.msc2946"
"/rooms/(?P<room_id>[^/]*)/spaces$"
),
)
def __init__(self, hs: "synapse.server.HomeServer"):
super().__init__()
self._auth = hs.get_auth()
self._space_summary_handler = hs.get_space_summary_handler()
async def on_GET(self, request: Request, room_id: str) -> Tuple[int, JsonDict]:
requester = await self._auth.get_user_by_req(request, allow_guest=True)
return 200, await self._space_summary_handler.get_space_summary(
requester.user.to_string(),
room_id,
suggested_only=parse_boolean(request, "suggested_only", default=False),
max_rooms_per_space=parse_integer(request, "max_rooms_per_space"),
)
async def on_POST(self, request: Request, room_id: str) -> Tuple[int, JsonDict]:
requester = await self._auth.get_user_by_req(request, allow_guest=True)
content = parse_json_object_from_request(request)
suggested_only = content.get("suggested_only", False)
if not isinstance(suggested_only, bool):
raise SynapseError(
400, "'suggested_only' must be a boolean", Codes.BAD_JSON
)
max_rooms_per_space = content.get("max_rooms_per_space")
if max_rooms_per_space is not None and not isinstance(max_rooms_per_space, int):
raise SynapseError(
400, "'max_rooms_per_space' must be an integer", Codes.BAD_JSON
)
return 200, await self._space_summary_handler.get_space_summary(
requester.user.to_string(),
room_id,
suggested_only=suggested_only,
max_rooms_per_space=max_rooms_per_space,
)
def register_servlets(hs: "synapse.server.HomeServer", http_server, is_worker=False):
RoomStateEventRestServlet(hs).register(http_server)
RoomMemberListRestServlet(hs).register(http_server)
JoinedRoomMemberListRestServlet(hs).register(http_server)
@ -1001,6 +1058,9 @@ def register_servlets(hs, http_server, is_worker=False):
RoomTypingRestServlet(hs).register(http_server)
RoomEventContextServlet(hs).register(http_server)
if hs.config.experimental.spaces_enabled:
RoomSpaceSummaryRestServlet(hs).register(http_server)
# Some servlets only get registered for the main process.
if not is_worker:
RoomCreateRestServlet(hs).register(http_server)

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@ -100,6 +100,7 @@ from synapse.handlers.room_member import RoomMemberHandler, RoomMemberMasterHand
from synapse.handlers.room_member_worker import RoomMemberWorkerHandler
from synapse.handlers.search import SearchHandler
from synapse.handlers.set_password import SetPasswordHandler
from synapse.handlers.space_summary import SpaceSummaryHandler
from synapse.handlers.sso import SsoHandler
from synapse.handlers.stats import StatsHandler
from synapse.handlers.sync import SyncHandler
@ -732,6 +733,10 @@ class HomeServer(metaclass=abc.ABCMeta):
def get_account_data_handler(self) -> AccountDataHandler:
return AccountDataHandler(self)
@cache_in_self
def get_space_summary_handler(self) -> SpaceSummaryHandler:
return SpaceSummaryHandler(self)
@cache_in_self
def get_external_cache(self) -> ExternalCache:
return ExternalCache(self)