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Federation API for Space summary (#9652)
Builds on the work done in #9643 to add a federation API for space summaries. There's a bit of refactoring of the existing client-server code first, to avoid too much duplication.
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changelog.d/9652.feature
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1
changelog.d/9652.feature
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@ -0,0 +1 @@
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Add initial experimental support for a "space summary" API.
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@ -18,7 +18,7 @@
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import functools
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import logging
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import re
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from typing import Optional, Tuple, Type
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from typing import Container, Mapping, Optional, Sequence, Tuple, Type
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import synapse
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from synapse.api.constants import MAX_GROUP_CATEGORYID_LENGTH, MAX_GROUP_ROLEID_LENGTH
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@ -29,7 +29,7 @@ from synapse.api.urls import (
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FEDERATION_V1_PREFIX,
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FEDERATION_V2_PREFIX,
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)
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from synapse.http.server import JsonResource
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from synapse.http.server import HttpServer, JsonResource
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from synapse.http.servlet import (
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parse_boolean_from_args,
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parse_integer_from_args,
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@ -44,7 +44,8 @@ from synapse.logging.opentracing import (
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whitelisted_homeserver,
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)
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from synapse.server import HomeServer
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from synapse.types import ThirdPartyInstanceID, get_domain_from_id
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from synapse.types import JsonDict, ThirdPartyInstanceID, get_domain_from_id
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from synapse.util.ratelimitutils import FederationRateLimiter
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from synapse.util.stringutils import parse_and_validate_server_name
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from synapse.util.versionstring import get_version_string
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@ -1376,6 +1377,40 @@ class FederationGroupsSettingJoinPolicyServlet(BaseFederationServlet):
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return 200, new_content
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class FederationSpaceSummaryServlet(BaseFederationServlet):
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PREFIX = FEDERATION_UNSTABLE_PREFIX + "/org.matrix.msc2946"
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PATH = "/spaces/(?P<room_id>[^/]*)"
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async def on_POST(
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self,
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origin: str,
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content: JsonDict,
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query: Mapping[bytes, Sequence[bytes]],
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room_id: str,
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) -> Tuple[int, JsonDict]:
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suggested_only = content.get("suggested_only", False)
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if not isinstance(suggested_only, bool):
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raise SynapseError(
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400, "'suggested_only' must be a boolean", Codes.BAD_JSON
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)
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exclude_rooms = content.get("exclude_rooms", [])
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if not isinstance(exclude_rooms, list) or any(
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not isinstance(x, str) for x in exclude_rooms
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):
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raise SynapseError(400, "bad value for 'exclude_rooms'", Codes.BAD_JSON)
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max_rooms_per_space = content.get("max_rooms_per_space")
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if max_rooms_per_space is not None and not isinstance(max_rooms_per_space, int):
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raise SynapseError(
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400, "bad value for 'max_rooms_per_space'", Codes.BAD_JSON
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)
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return 200, await self.handler.federation_space_summary(
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room_id, suggested_only, max_rooms_per_space, exclude_rooms
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)
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class RoomComplexityServlet(BaseFederationServlet):
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"""
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Indicates to other servers how complex (and therefore likely
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@ -1474,18 +1509,24 @@ DEFAULT_SERVLET_GROUPS = (
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)
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def register_servlets(hs, resource, authenticator, ratelimiter, servlet_groups=None):
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def register_servlets(
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hs: HomeServer,
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resource: HttpServer,
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authenticator: Authenticator,
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ratelimiter: FederationRateLimiter,
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servlet_groups: Optional[Container[str]] = None,
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):
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"""Initialize and register servlet classes.
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Will by default register all servlets. For custom behaviour, pass in
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a list of servlet_groups to register.
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Args:
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hs (synapse.server.HomeServer): homeserver
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resource (JsonResource): resource class to register to
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authenticator (Authenticator): authenticator to use
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ratelimiter (util.ratelimitutils.FederationRateLimiter): ratelimiter to use
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servlet_groups (list[str], optional): List of servlet groups to register.
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hs: homeserver
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resource: resource class to register to
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authenticator: authenticator to use
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ratelimiter: ratelimiter to use
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servlet_groups: List of servlet groups to register.
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Defaults to ``DEFAULT_SERVLET_GROUPS``.
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"""
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if not servlet_groups:
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@ -1500,6 +1541,14 @@ def register_servlets(hs, resource, authenticator, ratelimiter, servlet_groups=N
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server_name=hs.hostname,
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).register(resource)
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if hs.config.experimental.spaces_enabled:
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FederationSpaceSummaryServlet(
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handler=hs.get_space_summary_handler(),
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authenticator=authenticator,
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ratelimiter=ratelimiter,
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server_name=hs.hostname,
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).register(resource)
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if "openid" in servlet_groups:
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for servletclass in OPENID_SERVLET_CLASSES:
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servletclass(
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@ -16,7 +16,9 @@
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import itertools
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import logging
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from collections import deque
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from typing import TYPE_CHECKING, Iterable, List, Optional, Set
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from typing import TYPE_CHECKING, Iterable, List, Optional, Sequence, Set, Tuple
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import attr
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from synapse.api.constants import EventContentFields, EventTypes, HistoryVisibility
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from synapse.api.errors import AuthError
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@ -54,7 +56,7 @@ class SpaceSummaryHandler:
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max_rooms_per_space: Optional[int] = None,
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) -> JsonDict:
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"""
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Implementation of the space summary API
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Implementation of the space summary C-S API
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Args:
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requester: user id of the user making this request
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@ -66,7 +68,7 @@ class SpaceSummaryHandler:
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max_rooms_per_space: an optional limit on the number of child rooms we will
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return. This does not apply to the root room (ie, room_id), and
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is overridden by ROOMS_PER_SPACE_LIMIT.
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is overridden by MAX_ROOMS_PER_SPACE.
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Returns:
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summary dict to return
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@ -76,34 +78,105 @@ class SpaceSummaryHandler:
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await self._auth.check_user_in_room_or_world_readable(room_id, requester)
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# the queue of rooms to process
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room_queue = deque((room_id,))
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room_queue = deque((_RoomQueueEntry(room_id),))
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processed_rooms = set() # type: Set[str]
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rooms_result = [] # type: List[JsonDict]
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events_result = [] # type: List[JsonDict]
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now = self._clock.time_msec()
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while room_queue and len(rooms_result) < MAX_ROOMS:
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queue_entry = room_queue.popleft()
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room_id = queue_entry.room_id
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logger.debug("Processing room %s", room_id)
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processed_rooms.add(room_id)
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# The client-specified max_rooms_per_space limit doesn't apply to the
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# room_id specified in the request, so we ignore it if this is the
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# first room we are processing.
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max_children = max_rooms_per_space if processed_rooms else None
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rooms, events = await self._summarize_local_room(
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requester, room_id, suggested_only, max_children
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)
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rooms_result.extend(rooms)
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events_result.extend(events)
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# add any children that we haven't already processed to the queue
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for edge_event in events:
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if edge_event["state_key"] not in processed_rooms:
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room_queue.append(_RoomQueueEntry(edge_event["state_key"]))
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return {"rooms": rooms_result, "events": events_result}
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async def federation_space_summary(
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self,
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room_id: str,
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suggested_only: bool,
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max_rooms_per_space: Optional[int],
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exclude_rooms: Iterable[str],
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) -> JsonDict:
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"""
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Implementation of the space summary Federation API
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Args:
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room_id: room id to start the summary at
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suggested_only: whether we should only return children with the "suggested"
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flag set.
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max_rooms_per_space: an optional limit on the number of child rooms we will
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return. Unlike the C-S API, this applies to the root room (room_id).
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It is clipped to MAX_ROOMS_PER_SPACE.
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exclude_rooms: a list of rooms to skip over (presumably because the
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calling server has already seen them).
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Returns:
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summary dict to return
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"""
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# the queue of rooms to process
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room_queue = deque((room_id,))
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# the set of rooms that we should not walk further. Initialise it with the
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# excluded-rooms list; we will add other rooms as we process them so that
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# we do not loop.
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processed_rooms = set(exclude_rooms) # type: Set[str]
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rooms_result = [] # type: List[JsonDict]
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events_result = [] # type: List[JsonDict]
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while room_queue and len(rooms_result) < MAX_ROOMS:
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room_id = room_queue.popleft()
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logger.debug("Processing room %s", room_id)
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processed_rooms.add(room_id)
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try:
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await self._auth.check_user_in_room_or_world_readable(
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room_id, requester
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rooms, events = await self._summarize_local_room(
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None, room_id, suggested_only, max_rooms_per_space
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)
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except AuthError:
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logger.info(
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"user %s cannot view room %s, omitting from summary",
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requester,
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room_id,
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)
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continue
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rooms_result.extend(rooms)
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events_result.extend(events)
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# add any children that we haven't already processed to the queue
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for edge_event in events:
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if edge_event["state_key"] not in processed_rooms:
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room_queue.append(edge_event["state_key"])
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return {"rooms": rooms_result, "events": events_result}
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async def _summarize_local_room(
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self,
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requester: Optional[str],
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room_id: str,
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suggested_only: bool,
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max_children: Optional[int],
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) -> Tuple[Sequence[JsonDict], Sequence[JsonDict]]:
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if not await self._is_room_accessible(room_id, requester):
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return (), ()
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room_entry = await self._build_room_entry(room_id)
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rooms_result.append(room_entry)
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# look for child rooms/spaces.
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child_events = await self._get_child_events(room_id)
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@ -112,18 +185,12 @@ class SpaceSummaryHandler:
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# we only care about suggested children
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child_events = filter(_is_suggested_child_event, child_events)
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# The client-specified max_rooms_per_space limit doesn't apply to the
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# room_id specified in the request, so we ignore it if this is the
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# first room we are processing. Otherwise, apply any client-specified
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# limit, capping to our built-in limit.
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if max_rooms_per_space is not None and len(processed_rooms) > 1:
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max_rooms = min(MAX_ROOMS_PER_SPACE, max_rooms_per_space)
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else:
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max_rooms = MAX_ROOMS_PER_SPACE
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for edge_event in itertools.islice(child_events, max_rooms):
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edge_room_id = edge_event.state_key
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if max_children is None or max_children > MAX_ROOMS_PER_SPACE:
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max_children = MAX_ROOMS_PER_SPACE
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now = self._clock.time_msec()
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events_result = [] # type: List[JsonDict]
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for edge_event in itertools.islice(child_events, max_children):
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events_result.append(
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await self._event_serializer.serialize_event(
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edge_event,
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@ -131,12 +198,33 @@ class SpaceSummaryHandler:
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event_format=format_event_for_client_v2,
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)
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)
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return (room_entry,), events_result
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# if we haven't yet visited the target of this link, add it to the queue
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if edge_room_id not in processed_rooms:
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room_queue.append(edge_room_id)
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async def _is_room_accessible(self, room_id: str, requester: Optional[str]) -> bool:
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# if we have an authenticated requesting user, first check if they are in the
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# room
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if requester:
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try:
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await self._auth.check_user_in_room(room_id, requester)
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return True
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except AuthError:
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pass
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return {"rooms": rooms_result, "events": events_result}
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# otherwise, check if the room is peekable
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hist_vis_ev = await self._state_handler.get_current_state(
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room_id, EventTypes.RoomHistoryVisibility, ""
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)
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if hist_vis_ev:
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hist_vis = hist_vis_ev.content.get("history_visibility")
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if hist_vis == HistoryVisibility.WORLD_READABLE:
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return True
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logger.info(
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"room %s is unpeekable and user %s is not a member, omitting from summary",
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room_id,
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requester,
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)
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return False
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async def _build_room_entry(self, room_id: str) -> JsonDict:
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"""Generate en entry suitable for the 'rooms' list in the summary response"""
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@ -191,6 +279,11 @@ class SpaceSummaryHandler:
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return (e for e in events if e.content.get("via"))
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@attr.s(frozen=True, slots=True)
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class _RoomQueueEntry:
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room_id = attr.ib(type=str)
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def _is_suggested_child_event(edge_event: EventBase) -> bool:
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suggested = edge_event.content.get("suggested")
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if isinstance(suggested, bool) and suggested:
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