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e2e1d90a5e
When we get a partial_state response from send_join, store information in the database about it: * store a record about the room as a whole having partial state, and stash the list of member servers too. * flag the join event itself as having partial state * also, for any new events whose prev-events are partial-stated, note that they will *also* be partial-stated. We don't yet make any attempt to interpret this data, so API calls (and a bunch of other things) are just going to get incorrect data.
1446 lines
56 KiB
Python
1446 lines
56 KiB
Python
# Copyright 2014-2021 The Matrix.org Foundation C.I.C.
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# Copyright 2020 Sorunome
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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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"""Contains handlers for federation events."""
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import logging
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from http import HTTPStatus
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from typing import TYPE_CHECKING, Dict, Iterable, List, Optional, Tuple, Union
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from signedjson.key import decode_verify_key_bytes
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from signedjson.sign import verify_signed_json
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from unpaddedbase64 import decode_base64
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from twisted.internet import defer
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from synapse import event_auth
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from synapse.api.constants import EventContentFields, EventTypes, Membership
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from synapse.api.errors import (
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AuthError,
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CodeMessageException,
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Codes,
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FederationDeniedError,
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HttpResponseException,
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NotFoundError,
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RequestSendFailed,
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SynapseError,
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)
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from synapse.api.room_versions import KNOWN_ROOM_VERSIONS, RoomVersion
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from synapse.crypto.event_signing import compute_event_signature
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from synapse.event_auth import validate_event_for_room_version
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from synapse.events import EventBase
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from synapse.events.snapshot import EventContext
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from synapse.events.validator import EventValidator
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from synapse.federation.federation_client import InvalidResponseError
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from synapse.http.servlet import assert_params_in_dict
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from synapse.logging.context import (
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make_deferred_yieldable,
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nested_logging_context,
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preserve_fn,
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)
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.replication.http.federation import (
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ReplicationCleanRoomRestServlet,
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ReplicationStoreRoomOnOutlierMembershipRestServlet,
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)
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from synapse.storage.databases.main.events_worker import EventRedactBehaviour
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from synapse.types import JsonDict, StateMap, get_domain_from_id
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from synapse.util.async_helpers import Linearizer
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from synapse.util.retryutils import NotRetryingDestination
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from synapse.visibility import filter_events_for_server
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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def get_domains_from_state(state: StateMap[EventBase]) -> List[Tuple[str, int]]:
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"""Get joined domains from state
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Args:
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state: State map from type/state key to event.
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Returns:
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Returns a list of servers with the lowest depth of their joins.
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Sorted by lowest depth first.
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"""
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joined_users = [
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(state_key, int(event.depth))
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for (e_type, state_key), event in state.items()
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if e_type == EventTypes.Member and event.membership == Membership.JOIN
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]
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joined_domains: Dict[str, int] = {}
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for u, d in joined_users:
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try:
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dom = get_domain_from_id(u)
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old_d = joined_domains.get(dom)
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if old_d:
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joined_domains[dom] = min(d, old_d)
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else:
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joined_domains[dom] = d
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except Exception:
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pass
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return sorted(joined_domains.items(), key=lambda d: d[1])
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class FederationHandler:
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"""Handles general incoming federation requests
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Incoming events are *not* handled here, for which see FederationEventHandler.
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"""
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def __init__(self, hs: "HomeServer"):
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self.hs = hs
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self.store = hs.get_datastores().main
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self.storage = hs.get_storage()
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self.state_store = self.storage.state
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self.federation_client = hs.get_federation_client()
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self.state_handler = hs.get_state_handler()
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self.server_name = hs.hostname
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self.keyring = hs.get_keyring()
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self.is_mine_id = hs.is_mine_id
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self.spam_checker = hs.get_spam_checker()
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self.event_creation_handler = hs.get_event_creation_handler()
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self.event_builder_factory = hs.get_event_builder_factory()
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self._event_auth_handler = hs.get_event_auth_handler()
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self._server_notices_mxid = hs.config.servernotices.server_notices_mxid
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self.config = hs.config
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self.http_client = hs.get_proxied_blacklisted_http_client()
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self._replication = hs.get_replication_data_handler()
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self._federation_event_handler = hs.get_federation_event_handler()
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self._clean_room_for_join_client = ReplicationCleanRoomRestServlet.make_client(
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hs
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)
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if hs.config.worker.worker_app:
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self._maybe_store_room_on_outlier_membership = (
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ReplicationStoreRoomOnOutlierMembershipRestServlet.make_client(hs)
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)
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else:
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self._maybe_store_room_on_outlier_membership = (
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self.store.maybe_store_room_on_outlier_membership
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)
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self._room_backfill = Linearizer("room_backfill")
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self.third_party_event_rules = hs.get_third_party_event_rules()
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async def maybe_backfill(
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self, room_id: str, current_depth: int, limit: int
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) -> bool:
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"""Checks the database to see if we should backfill before paginating,
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and if so do.
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Args:
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room_id
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current_depth: The depth from which we're paginating from. This is
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used to decide if we should backfill and what extremities to
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use.
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limit: The number of events that the pagination request will
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return. This is used as part of the heuristic to decide if we
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should back paginate.
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"""
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with (await self._room_backfill.queue(room_id)):
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return await self._maybe_backfill_inner(room_id, current_depth, limit)
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async def _maybe_backfill_inner(
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self, room_id: str, current_depth: int, limit: int
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) -> bool:
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oldest_events_with_depth = (
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await self.store.get_oldest_event_ids_with_depth_in_room(room_id)
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)
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insertion_events_to_be_backfilled: Dict[str, int] = {}
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if self.hs.config.experimental.msc2716_enabled:
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insertion_events_to_be_backfilled = (
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await self.store.get_insertion_event_backward_extremities_in_room(
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room_id
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)
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)
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logger.debug(
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"_maybe_backfill_inner: extremities oldest_events_with_depth=%s insertion_events_to_be_backfilled=%s",
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oldest_events_with_depth,
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insertion_events_to_be_backfilled,
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)
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if not oldest_events_with_depth and not insertion_events_to_be_backfilled:
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logger.debug("Not backfilling as no extremeties found.")
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return False
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# We only want to paginate if we can actually see the events we'll get,
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# as otherwise we'll just spend a lot of resources to get redacted
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# events.
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#
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# We do this by filtering all the backwards extremities and seeing if
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# any remain. Given we don't have the extremity events themselves, we
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# need to actually check the events that reference them.
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#
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# *Note*: the spec wants us to keep backfilling until we reach the start
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# of the room in case we are allowed to see some of the history. However
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# in practice that causes more issues than its worth, as a) its
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# relatively rare for there to be any visible history and b) even when
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# there is its often sufficiently long ago that clients would stop
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# attempting to paginate before backfill reached the visible history.
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#
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# TODO: If we do do a backfill then we should filter the backwards
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# extremities to only include those that point to visible portions of
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# history.
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#
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# TODO: Correctly handle the case where we are allowed to see the
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# forward event but not the backward extremity, e.g. in the case of
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# initial join of the server where we are allowed to see the join
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# event but not anything before it. This would require looking at the
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# state *before* the event, ignoring the special casing certain event
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# types have.
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forward_event_ids = await self.store.get_successor_events(
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list(oldest_events_with_depth)
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)
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extremities_events = await self.store.get_events(
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forward_event_ids,
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redact_behaviour=EventRedactBehaviour.AS_IS,
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get_prev_content=False,
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)
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# We set `check_history_visibility_only` as we might otherwise get false
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# positives from users having been erased.
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filtered_extremities = await filter_events_for_server(
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self.storage,
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self.server_name,
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list(extremities_events.values()),
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redact=False,
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check_history_visibility_only=True,
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)
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logger.debug(
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"_maybe_backfill_inner: filtered_extremities %s", filtered_extremities
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)
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if not filtered_extremities and not insertion_events_to_be_backfilled:
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return False
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extremities = {
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**oldest_events_with_depth,
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# TODO: insertion_events_to_be_backfilled is currently skipping the filtered_extremities checks
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**insertion_events_to_be_backfilled,
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}
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# Check if we reached a point where we should start backfilling.
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sorted_extremeties_tuple = sorted(extremities.items(), key=lambda e: -int(e[1]))
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max_depth = sorted_extremeties_tuple[0][1]
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# If we're approaching an extremity we trigger a backfill, otherwise we
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# no-op.
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#
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# We chose twice the limit here as then clients paginating backwards
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# will send pagination requests that trigger backfill at least twice
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# using the most recent extremity before it gets removed (see below). We
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# chose more than one times the limit in case of failure, but choosing a
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# much larger factor will result in triggering a backfill request much
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# earlier than necessary.
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if current_depth - 2 * limit > max_depth:
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logger.debug(
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"Not backfilling as we don't need to. %d < %d - 2 * %d",
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max_depth,
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current_depth,
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limit,
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)
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return False
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# We ignore extremities that have a greater depth than our current depth
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# as:
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# 1. we don't really care about getting events that have happened
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# after our current position; and
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# 2. we have likely previously tried and failed to backfill from that
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# extremity, so to avoid getting "stuck" requesting the same
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# backfill repeatedly we drop those extremities.
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filtered_sorted_extremeties_tuple = [
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t for t in sorted_extremeties_tuple if int(t[1]) <= current_depth
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]
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logger.debug(
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"room_id: %s, backfill: current_depth: %s, limit: %s, max_depth: %s, extrems (%d): %s filtered_sorted_extremeties_tuple: %s",
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room_id,
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current_depth,
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limit,
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max_depth,
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len(sorted_extremeties_tuple),
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sorted_extremeties_tuple,
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filtered_sorted_extremeties_tuple,
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)
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# However, we need to check that the filtered extremities are non-empty.
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# If they are empty then either we can a) bail or b) still attempt to
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# backfill. We opt to try backfilling anyway just in case we do get
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# relevant events.
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if filtered_sorted_extremeties_tuple:
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sorted_extremeties_tuple = filtered_sorted_extremeties_tuple
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# We don't want to specify too many extremities as it causes the backfill
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# request URI to be too long.
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extremities = dict(sorted_extremeties_tuple[:5])
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# Now we need to decide which hosts to hit first.
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# First we try hosts that are already in the room
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# TODO: HEURISTIC ALERT.
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curr_state = await self.state_handler.get_current_state(room_id)
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curr_domains = get_domains_from_state(curr_state)
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likely_domains = [
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domain for domain, depth in curr_domains if domain != self.server_name
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]
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async def try_backfill(domains: List[str]) -> bool:
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# TODO: Should we try multiple of these at a time?
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for dom in domains:
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try:
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await self._federation_event_handler.backfill(
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dom, room_id, limit=100, extremities=extremities
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)
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# If this succeeded then we probably already have the
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# appropriate stuff.
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# TODO: We can probably do something more intelligent here.
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return True
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except (SynapseError, InvalidResponseError) as e:
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logger.info("Failed to backfill from %s because %s", dom, e)
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continue
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except HttpResponseException as e:
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if 400 <= e.code < 500:
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raise e.to_synapse_error()
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logger.info("Failed to backfill from %s because %s", dom, e)
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continue
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except CodeMessageException as e:
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if 400 <= e.code < 500:
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raise
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logger.info("Failed to backfill from %s because %s", dom, e)
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continue
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except NotRetryingDestination as e:
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logger.info(str(e))
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continue
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except RequestSendFailed as e:
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logger.info("Failed to get backfill from %s because %s", dom, e)
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continue
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except FederationDeniedError as e:
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logger.info(e)
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continue
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except Exception as e:
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logger.exception("Failed to backfill from %s because %s", dom, e)
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continue
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return False
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success = await try_backfill(likely_domains)
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if success:
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return True
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# Huh, well *those* domains didn't work out. Lets try some domains
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# from the time.
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tried_domains = set(likely_domains)
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tried_domains.add(self.server_name)
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event_ids = list(extremities.keys())
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logger.debug("calling resolve_state_groups in _maybe_backfill")
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resolve = preserve_fn(self.state_handler.resolve_state_groups_for_events)
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states_list = await make_deferred_yieldable(
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defer.gatherResults(
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[resolve(room_id, [e]) for e in event_ids], consumeErrors=True
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)
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)
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# A map from event_id to state map of event_ids.
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state_ids: Dict[str, StateMap[str]] = dict(
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zip(event_ids, [s.state for s in states_list])
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)
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state_map = await self.store.get_events(
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[e_id for ids in state_ids.values() for e_id in ids.values()],
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get_prev_content=False,
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)
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# A map from event_id to state map of events.
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state_events: Dict[str, StateMap[EventBase]] = {
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key: {
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k: state_map[e_id]
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for k, e_id in state_dict.items()
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if e_id in state_map
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}
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for key, state_dict in state_ids.items()
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}
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for e_id in event_ids:
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likely_extremeties_domains = get_domains_from_state(state_events[e_id])
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success = await try_backfill(
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[
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dom
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for dom, _ in likely_extremeties_domains
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if dom not in tried_domains
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]
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)
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if success:
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return True
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tried_domains.update(dom for dom, _ in likely_extremeties_domains)
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return False
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async def send_invite(self, target_host: str, event: EventBase) -> EventBase:
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"""Sends the invite to the remote server for signing.
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Invites must be signed by the invitee's server before distribution.
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"""
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try:
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pdu = await self.federation_client.send_invite(
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destination=target_host,
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room_id=event.room_id,
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event_id=event.event_id,
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pdu=event,
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)
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except RequestSendFailed:
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raise SynapseError(502, f"Can't connect to server {target_host}")
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return pdu
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async def on_event_auth(self, event_id: str) -> List[EventBase]:
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event = await self.store.get_event(event_id)
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auth = await self.store.get_auth_chain(
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event.room_id, list(event.auth_event_ids()), include_given=True
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)
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return list(auth)
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async def do_invite_join(
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self, target_hosts: Iterable[str], room_id: str, joinee: str, content: JsonDict
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) -> Tuple[str, int]:
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"""Attempts to join the `joinee` to the room `room_id` via the
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servers contained in `target_hosts`.
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This first triggers a /make_join/ request that returns a partial
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event that we can fill out and sign. This is then sent to the
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remote server via /send_join/ which responds with the state at that
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event and the auth_chains.
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|
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We suspend processing of any received events from this room until we
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have finished processing the join.
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|
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Args:
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target_hosts: List of servers to attempt to join the room with.
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|
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room_id: The ID of the room to join.
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joinee: The User ID of the joining user.
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content: The event content to use for the join event.
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"""
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|
# TODO: We should be able to call this on workers, but the upgrading of
|
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# room stuff after join currently doesn't work on workers.
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assert self.config.worker.worker_app is None
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logger.debug("Joining %s to %s", joinee, room_id)
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origin, event, room_version_obj = await self._make_and_verify_event(
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target_hosts,
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room_id,
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joinee,
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"join",
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content,
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params={"ver": KNOWN_ROOM_VERSIONS},
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)
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|
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# This shouldn't happen, because the RoomMemberHandler has a
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# linearizer lock which only allows one operation per user per room
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# at a time - so this is just paranoia.
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assert room_id not in self._federation_event_handler.room_queues
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self._federation_event_handler.room_queues[room_id] = []
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await self._clean_room_for_join(room_id)
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try:
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# Try the host we successfully got a response to /make_join/
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# request first.
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|
host_list = list(target_hosts)
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|
try:
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host_list.remove(origin)
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host_list.insert(0, origin)
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except ValueError:
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pass
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|
|
ret = await self.federation_client.send_join(
|
|
host_list, event, room_version_obj
|
|
)
|
|
|
|
event = ret.event
|
|
origin = ret.origin
|
|
state = ret.state
|
|
auth_chain = ret.auth_chain
|
|
auth_chain.sort(key=lambda e: e.depth)
|
|
|
|
logger.debug("do_invite_join auth_chain: %s", auth_chain)
|
|
logger.debug("do_invite_join state: %s", state)
|
|
|
|
logger.debug("do_invite_join event: %s", event)
|
|
|
|
# if this is the first time we've joined this room, it's time to add
|
|
# a row to `rooms` with the correct room version. If there's already a
|
|
# row there, we should override it, since it may have been populated
|
|
# based on an invite request which lied about the room version.
|
|
#
|
|
# federation_client.send_join has already checked that the room
|
|
# version in the received create event is the same as room_version_obj,
|
|
# so we can rely on it now.
|
|
#
|
|
await self.store.upsert_room_on_join(
|
|
room_id=room_id,
|
|
room_version=room_version_obj,
|
|
state_events=state,
|
|
)
|
|
|
|
if ret.partial_state:
|
|
await self.store.store_partial_state_room(room_id, ret.servers_in_room)
|
|
|
|
max_stream_id = await self._federation_event_handler.process_remote_join(
|
|
origin,
|
|
room_id,
|
|
auth_chain,
|
|
state,
|
|
event,
|
|
room_version_obj,
|
|
partial_state=ret.partial_state,
|
|
)
|
|
|
|
# We wait here until this instance has seen the events come down
|
|
# replication (if we're using replication) as the below uses caches.
|
|
await self._replication.wait_for_stream_position(
|
|
self.config.worker.events_shard_config.get_instance(room_id),
|
|
"events",
|
|
max_stream_id,
|
|
)
|
|
|
|
# Check whether this room is the result of an upgrade of a room we already know
|
|
# about. If so, migrate over user information
|
|
predecessor = await self.store.get_room_predecessor(room_id)
|
|
if not predecessor or not isinstance(predecessor.get("room_id"), str):
|
|
return event.event_id, max_stream_id
|
|
old_room_id = predecessor["room_id"]
|
|
logger.debug(
|
|
"Found predecessor for %s during remote join: %s", room_id, old_room_id
|
|
)
|
|
|
|
# We retrieve the room member handler here as to not cause a cyclic dependency
|
|
member_handler = self.hs.get_room_member_handler()
|
|
await member_handler.transfer_room_state_on_room_upgrade(
|
|
old_room_id, room_id
|
|
)
|
|
|
|
logger.debug("Finished joining %s to %s", joinee, room_id)
|
|
return event.event_id, max_stream_id
|
|
finally:
|
|
room_queue = self._federation_event_handler.room_queues[room_id]
|
|
del self._federation_event_handler.room_queues[room_id]
|
|
|
|
# we don't need to wait for the queued events to be processed -
|
|
# it's just a best-effort thing at this point. We do want to do
|
|
# them roughly in order, though, otherwise we'll end up making
|
|
# lots of requests for missing prev_events which we do actually
|
|
# have. Hence we fire off the background task, but don't wait for it.
|
|
|
|
run_as_background_process(
|
|
"handle_queued_pdus", self._handle_queued_pdus, room_queue
|
|
)
|
|
|
|
async def do_knock(
|
|
self,
|
|
target_hosts: List[str],
|
|
room_id: str,
|
|
knockee: str,
|
|
content: JsonDict,
|
|
) -> Tuple[str, int]:
|
|
"""Sends the knock to the remote server.
|
|
|
|
This first triggers a make_knock request that returns a partial
|
|
event that we can fill out and sign. This is then sent to the
|
|
remote server via send_knock.
|
|
|
|
Knock events must be signed by the knockee's server before distributing.
|
|
|
|
Args:
|
|
target_hosts: A list of hosts that we want to try knocking through.
|
|
room_id: The ID of the room to knock on.
|
|
knockee: The ID of the user who is knocking.
|
|
content: The content of the knock event.
|
|
|
|
Returns:
|
|
A tuple of (event ID, stream ID).
|
|
|
|
Raises:
|
|
SynapseError: If the chosen remote server returns a 3xx/4xx code.
|
|
RuntimeError: If no servers were reachable.
|
|
"""
|
|
logger.debug("Knocking on room %s on behalf of user %s", room_id, knockee)
|
|
|
|
# Inform the remote server of the room versions we support
|
|
supported_room_versions = list(KNOWN_ROOM_VERSIONS.keys())
|
|
|
|
# Ask the remote server to create a valid knock event for us. Once received,
|
|
# we sign the event
|
|
params: Dict[str, Iterable[str]] = {"ver": supported_room_versions}
|
|
origin, event, event_format_version = await self._make_and_verify_event(
|
|
target_hosts, room_id, knockee, Membership.KNOCK, content, params=params
|
|
)
|
|
|
|
# Mark the knock as an outlier as we don't yet have the state at this point in
|
|
# the DAG.
|
|
event.internal_metadata.outlier = True
|
|
|
|
# ... but tell /sync to send it to clients anyway.
|
|
event.internal_metadata.out_of_band_membership = True
|
|
|
|
# Record the room ID and its version so that we have a record of the room
|
|
await self._maybe_store_room_on_outlier_membership(
|
|
room_id=event.room_id, room_version=event_format_version
|
|
)
|
|
|
|
# Initially try the host that we successfully called /make_knock on
|
|
try:
|
|
target_hosts.remove(origin)
|
|
target_hosts.insert(0, origin)
|
|
except ValueError:
|
|
pass
|
|
|
|
# Send the signed event back to the room, and potentially receive some
|
|
# further information about the room in the form of partial state events
|
|
stripped_room_state = await self.federation_client.send_knock(
|
|
target_hosts, event
|
|
)
|
|
|
|
# Store any stripped room state events in the "unsigned" key of the event.
|
|
# This is a bit of a hack and is cribbing off of invites. Basically we
|
|
# store the room state here and retrieve it again when this event appears
|
|
# in the invitee's sync stream. It is stripped out for all other local users.
|
|
event.unsigned["knock_room_state"] = stripped_room_state["knock_state_events"]
|
|
|
|
context = EventContext.for_outlier()
|
|
stream_id = await self._federation_event_handler.persist_events_and_notify(
|
|
event.room_id, [(event, context)]
|
|
)
|
|
return event.event_id, stream_id
|
|
|
|
async def _handle_queued_pdus(
|
|
self, room_queue: List[Tuple[EventBase, str]]
|
|
) -> None:
|
|
"""Process PDUs which got queued up while we were busy send_joining.
|
|
|
|
Args:
|
|
room_queue: list of PDUs to be processed and the servers that sent them
|
|
"""
|
|
for p, origin in room_queue:
|
|
try:
|
|
logger.info(
|
|
"Processing queued PDU %s which was received while we were joining",
|
|
p,
|
|
)
|
|
with nested_logging_context(p.event_id):
|
|
await self._federation_event_handler.on_receive_pdu(origin, p)
|
|
except Exception as e:
|
|
logger.warning(
|
|
"Error handling queued PDU %s from %s: %s", p.event_id, origin, e
|
|
)
|
|
|
|
async def on_make_join_request(
|
|
self, origin: str, room_id: str, user_id: str
|
|
) -> EventBase:
|
|
"""We've received a /make_join/ request, so we create a partial
|
|
join event for the room and return that. We do *not* persist or
|
|
process it until the other server has signed it and sent it back.
|
|
|
|
Args:
|
|
origin: The (verified) server name of the requesting server.
|
|
room_id: Room to create join event in
|
|
user_id: The user to create the join for
|
|
"""
|
|
if get_domain_from_id(user_id) != origin:
|
|
logger.info(
|
|
"Got /make_join request for user %r from different origin %s, ignoring",
|
|
user_id,
|
|
origin,
|
|
)
|
|
raise SynapseError(403, "User not from origin", Codes.FORBIDDEN)
|
|
|
|
# checking the room version will check that we've actually heard of the room
|
|
# (and return a 404 otherwise)
|
|
room_version = await self.store.get_room_version(room_id)
|
|
|
|
# now check that we are *still* in the room
|
|
is_in_room = await self._event_auth_handler.check_host_in_room(
|
|
room_id, self.server_name
|
|
)
|
|
if not is_in_room:
|
|
logger.info(
|
|
"Got /make_join request for room %s we are no longer in",
|
|
room_id,
|
|
)
|
|
raise NotFoundError("Not an active room on this server")
|
|
|
|
event_content = {"membership": Membership.JOIN}
|
|
|
|
# If the current room is using restricted join rules, additional information
|
|
# may need to be included in the event content in order to efficiently
|
|
# validate the event.
|
|
#
|
|
# Note that this requires the /send_join request to come back to the
|
|
# same server.
|
|
if room_version.msc3083_join_rules:
|
|
state_ids = await self.store.get_current_state_ids(room_id)
|
|
if await self._event_auth_handler.has_restricted_join_rules(
|
|
state_ids, room_version
|
|
):
|
|
prev_member_event_id = state_ids.get((EventTypes.Member, user_id), None)
|
|
# If the user is invited or joined to the room already, then
|
|
# no additional info is needed.
|
|
include_auth_user_id = True
|
|
if prev_member_event_id:
|
|
prev_member_event = await self.store.get_event(prev_member_event_id)
|
|
include_auth_user_id = prev_member_event.membership not in (
|
|
Membership.JOIN,
|
|
Membership.INVITE,
|
|
)
|
|
|
|
if include_auth_user_id:
|
|
event_content[
|
|
EventContentFields.AUTHORISING_USER
|
|
] = await self._event_auth_handler.get_user_which_could_invite(
|
|
room_id,
|
|
state_ids,
|
|
)
|
|
|
|
builder = self.event_builder_factory.for_room_version(
|
|
room_version,
|
|
{
|
|
"type": EventTypes.Member,
|
|
"content": event_content,
|
|
"room_id": room_id,
|
|
"sender": user_id,
|
|
"state_key": user_id,
|
|
},
|
|
)
|
|
|
|
try:
|
|
event, context = await self.event_creation_handler.create_new_client_event(
|
|
builder=builder
|
|
)
|
|
except SynapseError as e:
|
|
logger.warning("Failed to create join to %s because %s", room_id, e)
|
|
raise
|
|
|
|
# Ensure the user can even join the room.
|
|
await self._federation_event_handler.check_join_restrictions(context, event)
|
|
|
|
# The remote hasn't signed it yet, obviously. We'll do the full checks
|
|
# when we get the event back in `on_send_join_request`
|
|
await self._event_auth_handler.check_auth_rules_from_context(
|
|
room_version, event, context
|
|
)
|
|
return event
|
|
|
|
async def on_invite_request(
|
|
self, origin: str, event: EventBase, room_version: RoomVersion
|
|
) -> EventBase:
|
|
"""We've got an invite event. Process and persist it. Sign it.
|
|
|
|
Respond with the now signed event.
|
|
"""
|
|
if event.state_key is None:
|
|
raise SynapseError(400, "The invite event did not have a state key")
|
|
|
|
is_blocked = await self.store.is_room_blocked(event.room_id)
|
|
if is_blocked:
|
|
raise SynapseError(403, "This room has been blocked on this server")
|
|
|
|
if self.hs.config.server.block_non_admin_invites:
|
|
raise SynapseError(403, "This server does not accept room invites")
|
|
|
|
if not await self.spam_checker.user_may_invite(
|
|
event.sender, event.state_key, event.room_id
|
|
):
|
|
raise SynapseError(
|
|
403, "This user is not permitted to send invites to this server/user"
|
|
)
|
|
|
|
membership = event.content.get("membership")
|
|
if event.type != EventTypes.Member or membership != Membership.INVITE:
|
|
raise SynapseError(400, "The event was not an m.room.member invite event")
|
|
|
|
sender_domain = get_domain_from_id(event.sender)
|
|
if sender_domain != origin:
|
|
raise SynapseError(
|
|
400, "The invite event was not from the server sending it"
|
|
)
|
|
|
|
if not self.is_mine_id(event.state_key):
|
|
raise SynapseError(400, "The invite event must be for this server")
|
|
|
|
# block any attempts to invite the server notices mxid
|
|
if event.state_key == self._server_notices_mxid:
|
|
raise SynapseError(HTTPStatus.FORBIDDEN, "Cannot invite this user")
|
|
|
|
# We retrieve the room member handler here as to not cause a cyclic dependency
|
|
member_handler = self.hs.get_room_member_handler()
|
|
# We don't rate limit based on room ID, as that should be done by
|
|
# sending server.
|
|
await member_handler.ratelimit_invite(None, None, event.state_key)
|
|
|
|
# keep a record of the room version, if we don't yet know it.
|
|
# (this may get overwritten if we later get a different room version in a
|
|
# join dance).
|
|
await self._maybe_store_room_on_outlier_membership(
|
|
room_id=event.room_id, room_version=room_version
|
|
)
|
|
|
|
event.internal_metadata.outlier = True
|
|
event.internal_metadata.out_of_band_membership = True
|
|
|
|
event.signatures.update(
|
|
compute_event_signature(
|
|
room_version,
|
|
event.get_pdu_json(),
|
|
self.hs.hostname,
|
|
self.hs.signing_key,
|
|
)
|
|
)
|
|
|
|
context = EventContext.for_outlier()
|
|
await self._federation_event_handler.persist_events_and_notify(
|
|
event.room_id, [(event, context)]
|
|
)
|
|
|
|
return event
|
|
|
|
async def do_remotely_reject_invite(
|
|
self, target_hosts: Iterable[str], room_id: str, user_id: str, content: JsonDict
|
|
) -> Tuple[EventBase, int]:
|
|
origin, event, room_version = await self._make_and_verify_event(
|
|
target_hosts, room_id, user_id, "leave", content=content
|
|
)
|
|
# Mark as outlier as we don't have any state for this event; we're not
|
|
# even in the room.
|
|
event.internal_metadata.outlier = True
|
|
event.internal_metadata.out_of_band_membership = True
|
|
|
|
# Try the host that we successfully called /make_leave/ on first for
|
|
# the /send_leave/ request.
|
|
host_list = list(target_hosts)
|
|
try:
|
|
host_list.remove(origin)
|
|
host_list.insert(0, origin)
|
|
except ValueError:
|
|
pass
|
|
|
|
await self.federation_client.send_leave(host_list, event)
|
|
|
|
context = EventContext.for_outlier()
|
|
stream_id = await self._federation_event_handler.persist_events_and_notify(
|
|
event.room_id, [(event, context)]
|
|
)
|
|
|
|
return event, stream_id
|
|
|
|
async def _make_and_verify_event(
|
|
self,
|
|
target_hosts: Iterable[str],
|
|
room_id: str,
|
|
user_id: str,
|
|
membership: str,
|
|
content: JsonDict,
|
|
params: Optional[Dict[str, Union[str, Iterable[str]]]] = None,
|
|
) -> Tuple[str, EventBase, RoomVersion]:
|
|
(
|
|
origin,
|
|
event,
|
|
room_version,
|
|
) = await self.federation_client.make_membership_event(
|
|
target_hosts, room_id, user_id, membership, content, params=params
|
|
)
|
|
|
|
logger.debug("Got response to make_%s: %s", membership, event)
|
|
|
|
# We should assert some things.
|
|
# FIXME: Do this in a nicer way
|
|
assert event.type == EventTypes.Member
|
|
assert event.user_id == user_id
|
|
assert event.state_key == user_id
|
|
assert event.room_id == room_id
|
|
return origin, event, room_version
|
|
|
|
async def on_make_leave_request(
|
|
self, origin: str, room_id: str, user_id: str
|
|
) -> EventBase:
|
|
"""We've received a /make_leave/ request, so we create a partial
|
|
leave event for the room and return that. We do *not* persist or
|
|
process it until the other server has signed it and sent it back.
|
|
|
|
Args:
|
|
origin: The (verified) server name of the requesting server.
|
|
room_id: Room to create leave event in
|
|
user_id: The user to create the leave for
|
|
"""
|
|
if get_domain_from_id(user_id) != origin:
|
|
logger.info(
|
|
"Got /make_leave request for user %r from different origin %s, ignoring",
|
|
user_id,
|
|
origin,
|
|
)
|
|
raise SynapseError(403, "User not from origin", Codes.FORBIDDEN)
|
|
|
|
room_version_obj = await self.store.get_room_version(room_id)
|
|
builder = self.event_builder_factory.for_room_version(
|
|
room_version_obj,
|
|
{
|
|
"type": EventTypes.Member,
|
|
"content": {"membership": Membership.LEAVE},
|
|
"room_id": room_id,
|
|
"sender": user_id,
|
|
"state_key": user_id,
|
|
},
|
|
)
|
|
|
|
event, context = await self.event_creation_handler.create_new_client_event(
|
|
builder=builder
|
|
)
|
|
|
|
try:
|
|
# The remote hasn't signed it yet, obviously. We'll do the full checks
|
|
# when we get the event back in `on_send_leave_request`
|
|
await self._event_auth_handler.check_auth_rules_from_context(
|
|
room_version_obj, event, context
|
|
)
|
|
except AuthError as e:
|
|
logger.warning("Failed to create new leave %r because %s", event, e)
|
|
raise e
|
|
|
|
return event
|
|
|
|
async def on_make_knock_request(
|
|
self, origin: str, room_id: str, user_id: str
|
|
) -> EventBase:
|
|
"""We've received a make_knock request, so we create a partial
|
|
knock event for the room and return that. We do *not* persist or
|
|
process it until the other server has signed it and sent it back.
|
|
|
|
Args:
|
|
origin: The (verified) server name of the requesting server.
|
|
room_id: The room to create the knock event in.
|
|
user_id: The user to create the knock for.
|
|
|
|
Returns:
|
|
The partial knock event.
|
|
"""
|
|
if get_domain_from_id(user_id) != origin:
|
|
logger.info(
|
|
"Get /make_knock request for user %r from different origin %s, ignoring",
|
|
user_id,
|
|
origin,
|
|
)
|
|
raise SynapseError(403, "User not from origin", Codes.FORBIDDEN)
|
|
|
|
room_version_obj = await self.store.get_room_version(room_id)
|
|
|
|
builder = self.event_builder_factory.for_room_version(
|
|
room_version_obj,
|
|
{
|
|
"type": EventTypes.Member,
|
|
"content": {"membership": Membership.KNOCK},
|
|
"room_id": room_id,
|
|
"sender": user_id,
|
|
"state_key": user_id,
|
|
},
|
|
)
|
|
|
|
event, context = await self.event_creation_handler.create_new_client_event(
|
|
builder=builder
|
|
)
|
|
|
|
event_allowed, _ = await self.third_party_event_rules.check_event_allowed(
|
|
event, context
|
|
)
|
|
if not event_allowed:
|
|
logger.warning("Creation of knock %s forbidden by third-party rules", event)
|
|
raise SynapseError(
|
|
403, "This event is not allowed in this context", Codes.FORBIDDEN
|
|
)
|
|
|
|
try:
|
|
# The remote hasn't signed it yet, obviously. We'll do the full checks
|
|
# when we get the event back in `on_send_knock_request`
|
|
await self._event_auth_handler.check_auth_rules_from_context(
|
|
room_version_obj, event, context
|
|
)
|
|
except AuthError as e:
|
|
logger.warning("Failed to create new knock %r because %s", event, e)
|
|
raise e
|
|
|
|
return event
|
|
|
|
async def get_state_for_pdu(self, room_id: str, event_id: str) -> List[EventBase]:
|
|
"""Returns the state at the event. i.e. not including said event."""
|
|
|
|
event = await self.store.get_event(event_id, check_room_id=room_id)
|
|
|
|
state_groups = await self.state_store.get_state_groups(room_id, [event_id])
|
|
|
|
if state_groups:
|
|
_, state = list(state_groups.items()).pop()
|
|
results = {(e.type, e.state_key): e for e in state}
|
|
|
|
if event.is_state():
|
|
# Get previous state
|
|
if "replaces_state" in event.unsigned:
|
|
prev_id = event.unsigned["replaces_state"]
|
|
if prev_id != event.event_id:
|
|
prev_event = await self.store.get_event(prev_id)
|
|
results[(event.type, event.state_key)] = prev_event
|
|
else:
|
|
del results[(event.type, event.state_key)]
|
|
|
|
res = list(results.values())
|
|
return res
|
|
else:
|
|
return []
|
|
|
|
async def get_state_ids_for_pdu(self, room_id: str, event_id: str) -> List[str]:
|
|
"""Returns the state at the event. i.e. not including said event."""
|
|
event = await self.store.get_event(event_id, check_room_id=room_id)
|
|
|
|
state_groups = await self.state_store.get_state_groups_ids(room_id, [event_id])
|
|
|
|
if state_groups:
|
|
_, state = list(state_groups.items()).pop()
|
|
results = state
|
|
|
|
if event.is_state():
|
|
# Get previous state
|
|
if "replaces_state" in event.unsigned:
|
|
prev_id = event.unsigned["replaces_state"]
|
|
if prev_id != event.event_id:
|
|
results[(event.type, event.state_key)] = prev_id
|
|
else:
|
|
results.pop((event.type, event.state_key), None)
|
|
|
|
return list(results.values())
|
|
else:
|
|
return []
|
|
|
|
async def on_backfill_request(
|
|
self, origin: str, room_id: str, pdu_list: List[str], limit: int
|
|
) -> List[EventBase]:
|
|
in_room = await self._event_auth_handler.check_host_in_room(room_id, origin)
|
|
if not in_room:
|
|
raise AuthError(403, "Host not in room.")
|
|
|
|
# Synapse asks for 100 events per backfill request. Do not allow more.
|
|
limit = min(limit, 100)
|
|
|
|
events = await self.store.get_backfill_events(room_id, pdu_list, limit)
|
|
logger.debug(
|
|
"on_backfill_request: backfill events=%s",
|
|
[
|
|
"event_id=%s,depth=%d,body=%s,prevs=%s\n"
|
|
% (
|
|
event.event_id,
|
|
event.depth,
|
|
event.content.get("body", event.type),
|
|
event.prev_event_ids(),
|
|
)
|
|
for event in events
|
|
],
|
|
)
|
|
|
|
events = await filter_events_for_server(self.storage, origin, events)
|
|
|
|
return events
|
|
|
|
async def get_persisted_pdu(
|
|
self, origin: str, event_id: str
|
|
) -> Optional[EventBase]:
|
|
"""Get an event from the database for the given server.
|
|
|
|
Args:
|
|
origin: hostname of server which is requesting the event; we
|
|
will check that the server is allowed to see it.
|
|
event_id: id of the event being requested
|
|
|
|
Returns:
|
|
None if we know nothing about the event; otherwise the (possibly-redacted) event.
|
|
|
|
Raises:
|
|
AuthError if the server is not currently in the room
|
|
"""
|
|
event = await self.store.get_event(
|
|
event_id, allow_none=True, allow_rejected=True
|
|
)
|
|
|
|
if event:
|
|
in_room = await self._event_auth_handler.check_host_in_room(
|
|
event.room_id, origin
|
|
)
|
|
if not in_room:
|
|
raise AuthError(403, "Host not in room.")
|
|
|
|
events = await filter_events_for_server(self.storage, origin, [event])
|
|
event = events[0]
|
|
return event
|
|
else:
|
|
return None
|
|
|
|
async def on_get_missing_events(
|
|
self,
|
|
origin: str,
|
|
room_id: str,
|
|
earliest_events: List[str],
|
|
latest_events: List[str],
|
|
limit: int,
|
|
) -> List[EventBase]:
|
|
in_room = await self._event_auth_handler.check_host_in_room(room_id, origin)
|
|
if not in_room:
|
|
raise AuthError(403, "Host not in room.")
|
|
|
|
# Only allow up to 20 events to be retrieved per request.
|
|
limit = min(limit, 20)
|
|
|
|
missing_events = await self.store.get_missing_events(
|
|
room_id=room_id,
|
|
earliest_events=earliest_events,
|
|
latest_events=latest_events,
|
|
limit=limit,
|
|
)
|
|
|
|
missing_events = await filter_events_for_server(
|
|
self.storage, origin, missing_events
|
|
)
|
|
|
|
return missing_events
|
|
|
|
async def exchange_third_party_invite(
|
|
self, sender_user_id: str, target_user_id: str, room_id: str, signed: JsonDict
|
|
) -> None:
|
|
third_party_invite = {"signed": signed}
|
|
|
|
event_dict = {
|
|
"type": EventTypes.Member,
|
|
"content": {
|
|
"membership": Membership.INVITE,
|
|
"third_party_invite": third_party_invite,
|
|
},
|
|
"room_id": room_id,
|
|
"sender": sender_user_id,
|
|
"state_key": target_user_id,
|
|
}
|
|
|
|
if await self._event_auth_handler.check_host_in_room(room_id, self.hs.hostname):
|
|
room_version_obj = await self.store.get_room_version(room_id)
|
|
builder = self.event_builder_factory.for_room_version(
|
|
room_version_obj, event_dict
|
|
)
|
|
|
|
EventValidator().validate_builder(builder)
|
|
event, context = await self.event_creation_handler.create_new_client_event(
|
|
builder=builder
|
|
)
|
|
|
|
event, context = await self.add_display_name_to_third_party_invite(
|
|
room_version_obj, event_dict, event, context
|
|
)
|
|
|
|
EventValidator().validate_new(event, self.config)
|
|
|
|
# We need to tell the transaction queue to send this out, even
|
|
# though the sender isn't a local user.
|
|
event.internal_metadata.send_on_behalf_of = self.hs.hostname
|
|
|
|
try:
|
|
validate_event_for_room_version(room_version_obj, event)
|
|
await self._event_auth_handler.check_auth_rules_from_context(
|
|
room_version_obj, event, context
|
|
)
|
|
except AuthError as e:
|
|
logger.warning("Denying new third party invite %r because %s", event, e)
|
|
raise e
|
|
|
|
await self._check_signature(event, context)
|
|
|
|
# We retrieve the room member handler here as to not cause a cyclic dependency
|
|
member_handler = self.hs.get_room_member_handler()
|
|
await member_handler.send_membership_event(None, event, context)
|
|
else:
|
|
destinations = {x.split(":", 1)[-1] for x in (sender_user_id, room_id)}
|
|
|
|
try:
|
|
await self.federation_client.forward_third_party_invite(
|
|
destinations, room_id, event_dict
|
|
)
|
|
except (RequestSendFailed, HttpResponseException):
|
|
raise SynapseError(502, "Failed to forward third party invite")
|
|
|
|
async def on_exchange_third_party_invite_request(
|
|
self, event_dict: JsonDict
|
|
) -> None:
|
|
"""Handle an exchange_third_party_invite request from a remote server
|
|
|
|
The remote server will call this when it wants to turn a 3pid invite
|
|
into a normal m.room.member invite.
|
|
|
|
Args:
|
|
event_dict: Dictionary containing the event body.
|
|
|
|
"""
|
|
assert_params_in_dict(event_dict, ["room_id"])
|
|
room_version_obj = await self.store.get_room_version(event_dict["room_id"])
|
|
|
|
# NB: event_dict has a particular specced format we might need to fudge
|
|
# if we change event formats too much.
|
|
builder = self.event_builder_factory.for_room_version(
|
|
room_version_obj, event_dict
|
|
)
|
|
|
|
event, context = await self.event_creation_handler.create_new_client_event(
|
|
builder=builder
|
|
)
|
|
event, context = await self.add_display_name_to_third_party_invite(
|
|
room_version_obj, event_dict, event, context
|
|
)
|
|
|
|
try:
|
|
validate_event_for_room_version(room_version_obj, event)
|
|
await self._event_auth_handler.check_auth_rules_from_context(
|
|
room_version_obj, event, context
|
|
)
|
|
except AuthError as e:
|
|
logger.warning("Denying third party invite %r because %s", event, e)
|
|
raise e
|
|
await self._check_signature(event, context)
|
|
|
|
# We need to tell the transaction queue to send this out, even
|
|
# though the sender isn't a local user.
|
|
event.internal_metadata.send_on_behalf_of = get_domain_from_id(event.sender)
|
|
|
|
# We retrieve the room member handler here as to not cause a cyclic dependency
|
|
member_handler = self.hs.get_room_member_handler()
|
|
await member_handler.send_membership_event(None, event, context)
|
|
|
|
async def add_display_name_to_third_party_invite(
|
|
self,
|
|
room_version_obj: RoomVersion,
|
|
event_dict: JsonDict,
|
|
event: EventBase,
|
|
context: EventContext,
|
|
) -> Tuple[EventBase, EventContext]:
|
|
key = (
|
|
EventTypes.ThirdPartyInvite,
|
|
event.content["third_party_invite"]["signed"]["token"],
|
|
)
|
|
original_invite = None
|
|
prev_state_ids = await context.get_prev_state_ids()
|
|
original_invite_id = prev_state_ids.get(key)
|
|
if original_invite_id:
|
|
original_invite = await self.store.get_event(
|
|
original_invite_id, allow_none=True
|
|
)
|
|
if original_invite:
|
|
# If the m.room.third_party_invite event's content is empty, it means the
|
|
# invite has been revoked. In this case, we don't have to raise an error here
|
|
# because the auth check will fail on the invite (because it's not able to
|
|
# fetch public keys from the m.room.third_party_invite event's content, which
|
|
# is empty).
|
|
display_name = original_invite.content.get("display_name")
|
|
event_dict["content"]["third_party_invite"]["display_name"] = display_name
|
|
else:
|
|
logger.info(
|
|
"Could not find invite event for third_party_invite: %r", event_dict
|
|
)
|
|
# We don't discard here as this is not the appropriate place to do
|
|
# auth checks. If we need the invite and don't have it then the
|
|
# auth check code will explode appropriately.
|
|
|
|
builder = self.event_builder_factory.for_room_version(
|
|
room_version_obj, event_dict
|
|
)
|
|
EventValidator().validate_builder(builder)
|
|
event, context = await self.event_creation_handler.create_new_client_event(
|
|
builder=builder
|
|
)
|
|
EventValidator().validate_new(event, self.config)
|
|
return event, context
|
|
|
|
async def _check_signature(self, event: EventBase, context: EventContext) -> None:
|
|
"""
|
|
Checks that the signature in the event is consistent with its invite.
|
|
|
|
Args:
|
|
event: The m.room.member event to check
|
|
context:
|
|
|
|
Raises:
|
|
AuthError: if signature didn't match any keys, or key has been
|
|
revoked,
|
|
SynapseError: if a transient error meant a key couldn't be checked
|
|
for revocation.
|
|
"""
|
|
signed = event.content["third_party_invite"]["signed"]
|
|
token = signed["token"]
|
|
|
|
prev_state_ids = await context.get_prev_state_ids()
|
|
invite_event_id = prev_state_ids.get((EventTypes.ThirdPartyInvite, token))
|
|
|
|
invite_event = None
|
|
if invite_event_id:
|
|
invite_event = await self.store.get_event(invite_event_id, allow_none=True)
|
|
|
|
if not invite_event:
|
|
raise AuthError(403, "Could not find invite")
|
|
|
|
logger.debug("Checking auth on event %r", event.content)
|
|
|
|
last_exception: Optional[Exception] = None
|
|
|
|
# for each public key in the 3pid invite event
|
|
for public_key_object in event_auth.get_public_keys(invite_event):
|
|
try:
|
|
# for each sig on the third_party_invite block of the actual invite
|
|
for server, signature_block in signed["signatures"].items():
|
|
for key_name in signature_block.keys():
|
|
if not key_name.startswith("ed25519:"):
|
|
continue
|
|
|
|
logger.debug(
|
|
"Attempting to verify sig with key %s from %r "
|
|
"against pubkey %r",
|
|
key_name,
|
|
server,
|
|
public_key_object,
|
|
)
|
|
|
|
try:
|
|
public_key = public_key_object["public_key"]
|
|
verify_key = decode_verify_key_bytes(
|
|
key_name, decode_base64(public_key)
|
|
)
|
|
verify_signed_json(signed, server, verify_key)
|
|
logger.debug(
|
|
"Successfully verified sig with key %s from %r "
|
|
"against pubkey %r",
|
|
key_name,
|
|
server,
|
|
public_key_object,
|
|
)
|
|
except Exception:
|
|
logger.info(
|
|
"Failed to verify sig with key %s from %r "
|
|
"against pubkey %r",
|
|
key_name,
|
|
server,
|
|
public_key_object,
|
|
)
|
|
raise
|
|
try:
|
|
if "key_validity_url" in public_key_object:
|
|
await self._check_key_revocation(
|
|
public_key, public_key_object["key_validity_url"]
|
|
)
|
|
except Exception:
|
|
logger.info(
|
|
"Failed to query key_validity_url %s",
|
|
public_key_object["key_validity_url"],
|
|
)
|
|
raise
|
|
return
|
|
except Exception as e:
|
|
last_exception = e
|
|
|
|
if last_exception is None:
|
|
# we can only get here if get_public_keys() returned an empty list
|
|
# TODO: make this better
|
|
raise RuntimeError("no public key in invite event")
|
|
|
|
raise last_exception
|
|
|
|
async def _check_key_revocation(self, public_key: str, url: str) -> None:
|
|
"""
|
|
Checks whether public_key has been revoked.
|
|
|
|
Args:
|
|
public_key: base-64 encoded public key.
|
|
url: Key revocation URL.
|
|
|
|
Raises:
|
|
AuthError: if they key has been revoked.
|
|
SynapseError: if a transient error meant a key couldn't be checked
|
|
for revocation.
|
|
"""
|
|
try:
|
|
response = await self.http_client.get_json(url, {"public_key": public_key})
|
|
except Exception:
|
|
raise SynapseError(502, "Third party certificate could not be checked")
|
|
if "valid" not in response or not response["valid"]:
|
|
raise AuthError(403, "Third party certificate was invalid")
|
|
|
|
async def _clean_room_for_join(self, room_id: str) -> None:
|
|
"""Called to clean up any data in DB for a given room, ready for the
|
|
server to join the room.
|
|
|
|
Args:
|
|
room_id
|
|
"""
|
|
if self.config.worker.worker_app:
|
|
await self._clean_room_for_join_client(room_id)
|
|
else:
|
|
await self.store.clean_room_for_join(room_id)
|
|
|
|
async def get_room_complexity(
|
|
self, remote_room_hosts: List[str], room_id: str
|
|
) -> Optional[dict]:
|
|
"""
|
|
Fetch the complexity of a remote room over federation.
|
|
|
|
Args:
|
|
remote_room_hosts (list[str]): The remote servers to ask.
|
|
room_id (str): The room ID to ask about.
|
|
|
|
Returns:
|
|
Dict contains the complexity
|
|
metric versions, while None means we could not fetch the complexity.
|
|
"""
|
|
|
|
for host in remote_room_hosts:
|
|
res = await self.federation_client.get_room_complexity(host, room_id)
|
|
|
|
# We got a result, return it.
|
|
if res:
|
|
return res
|
|
|
|
# We fell off the bottom, couldn't get the complexity from anyone. Oh
|
|
# well.
|
|
return None
|