1676 lines
67 KiB
Python
1676 lines
67 KiB
Python
# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2017-2018 New Vector Ltd
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# Copyright 2019-2020 The Matrix.org Foundation C.I.C.
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# Copyrignt 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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import logging
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import random
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from typing import TYPE_CHECKING, Any, Dict, List, Mapping, Optional, Tuple
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from canonicaljson import encode_canonical_json
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from twisted.internet import defer
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from twisted.internet.interfaces import IDelayedCall
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from synapse import event_auth
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from synapse.api.constants import (
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EventContentFields,
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EventTypes,
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GuestAccess,
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Membership,
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RelationTypes,
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UserTypes,
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)
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from synapse.api.errors import (
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AuthError,
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Codes,
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ConsentNotGivenError,
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NotFoundError,
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ShadowBanError,
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SynapseError,
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)
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from synapse.api.room_versions import KNOWN_ROOM_VERSIONS, RoomVersions
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from synapse.api.urls import ConsentURIBuilder
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from synapse.events import EventBase
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from synapse.events.builder import EventBuilder
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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.logging.context import make_deferred_yieldable, run_in_background
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.replication.http.send_event import ReplicationSendEventRestServlet
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from synapse.storage.databases.main.events_worker import EventRedactBehaviour
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from synapse.storage.state import StateFilter
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from synapse.types import Requester, RoomAlias, StreamToken, UserID, create_requester
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from synapse.util import json_decoder, json_encoder, log_failure
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from synapse.util.async_helpers import Linearizer, unwrapFirstError
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from synapse.util.caches.expiringcache import ExpiringCache
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from synapse.util.metrics import measure_func
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from synapse.visibility import filter_events_for_client
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from ._base import BaseHandler
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if TYPE_CHECKING:
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from synapse.events.third_party_rules import ThirdPartyEventRules
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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class MessageHandler:
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"""Contains some read only APIs to get state about a room"""
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def __init__(self, hs: "HomeServer"):
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self.auth = hs.get_auth()
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self.clock = hs.get_clock()
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self.state = hs.get_state_handler()
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self.store = hs.get_datastore()
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self.storage = hs.get_storage()
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self.state_store = self.storage.state
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self._event_serializer = hs.get_event_client_serializer()
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self._ephemeral_events_enabled = hs.config.enable_ephemeral_messages
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# The scheduled call to self._expire_event. None if no call is currently
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# scheduled.
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self._scheduled_expiry: Optional[IDelayedCall] = None
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if not hs.config.worker.worker_app:
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run_as_background_process(
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"_schedule_next_expiry", self._schedule_next_expiry
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)
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async def get_room_data(
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self,
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user_id: str,
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room_id: str,
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event_type: str,
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state_key: str,
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) -> Optional[EventBase]:
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"""Get data from a room.
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Args:
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user_id
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room_id
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event_type
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state_key
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Returns:
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The path data content.
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Raises:
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SynapseError or AuthError if the user is not in the room
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"""
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(
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membership,
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membership_event_id,
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) = await self.auth.check_user_in_room_or_world_readable(
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room_id, user_id, allow_departed_users=True
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)
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if membership == Membership.JOIN:
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data = await self.state.get_current_state(room_id, event_type, state_key)
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elif membership == Membership.LEAVE:
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key = (event_type, state_key)
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# If the membership is not JOIN, then the event ID should exist.
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assert (
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membership_event_id is not None
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), "check_user_in_room_or_world_readable returned invalid data"
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room_state = await self.state_store.get_state_for_events(
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[membership_event_id], StateFilter.from_types([key])
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)
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data = room_state[membership_event_id].get(key)
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else:
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# check_user_in_room_or_world_readable, if it doesn't raise an AuthError, should
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# only ever return a Membership.JOIN/LEAVE object
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#
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# Safeguard in case it returned something else
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logger.error(
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"Attempted to retrieve data from a room for a user that has never been in it. "
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"This should not have happened."
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)
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raise SynapseError(403, "User not in room", errcode=Codes.FORBIDDEN)
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return data
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async def get_state_events(
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self,
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user_id: str,
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room_id: str,
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state_filter: Optional[StateFilter] = None,
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at_token: Optional[StreamToken] = None,
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is_guest: bool = False,
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) -> List[dict]:
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"""Retrieve all state events for a given room. If the user is
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joined to the room then return the current state. If the user has
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left the room return the state events from when they left. If an explicit
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'at' parameter is passed, return the state events as of that event, if
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visible.
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Args:
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user_id: The user requesting state events.
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room_id: The room ID to get all state events from.
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state_filter: The state filter used to fetch state from the database.
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at_token: the stream token of the at which we are requesting
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the stats. If the user is not allowed to view the state as of that
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stream token, we raise a 403 SynapseError. If None, returns the current
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state based on the current_state_events table.
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is_guest: whether this user is a guest
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Returns:
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A list of dicts representing state events. [{}, {}, {}]
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Raises:
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NotFoundError (404) if the at token does not yield an event
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AuthError (403) if the user doesn't have permission to view
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members of this room.
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"""
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state_filter = state_filter or StateFilter.all()
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if at_token:
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# FIXME this claims to get the state at a stream position, but
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# get_recent_events_for_room operates by topo ordering. This therefore
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# does not reliably give you the state at the given stream position.
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# (https://github.com/matrix-org/synapse/issues/3305)
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last_events, _ = await self.store.get_recent_events_for_room(
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room_id, end_token=at_token.room_key, limit=1
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)
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if not last_events:
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raise NotFoundError("Can't find event for token %s" % (at_token,))
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last_event = last_events[0]
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# check whether the user is in the room at that time to determine
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# whether they should be treated as peeking.
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state_map = await self.state_store.get_state_for_event(
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last_event.event_id,
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StateFilter.from_types([(EventTypes.Member, user_id)]),
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)
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joined = False
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membership_event = state_map.get((EventTypes.Member, user_id))
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if membership_event:
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joined = membership_event.membership == Membership.JOIN
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is_peeking = not joined
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visible_events = await filter_events_for_client(
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self.storage,
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user_id,
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last_events,
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filter_send_to_client=False,
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is_peeking=is_peeking,
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)
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if visible_events:
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room_state_events = await self.state_store.get_state_for_events(
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[last_event.event_id], state_filter=state_filter
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)
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room_state: Mapping[Any, EventBase] = room_state_events[
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last_event.event_id
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]
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else:
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raise AuthError(
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403,
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"User %s not allowed to view events in room %s at token %s"
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% (user_id, room_id, at_token),
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)
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else:
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(
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membership,
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membership_event_id,
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) = await self.auth.check_user_in_room_or_world_readable(
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room_id, user_id, allow_departed_users=True
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)
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if membership == Membership.JOIN:
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state_ids = await self.store.get_filtered_current_state_ids(
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room_id, state_filter=state_filter
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)
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room_state = await self.store.get_events(state_ids.values())
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elif membership == Membership.LEAVE:
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# If the membership is not JOIN, then the event ID should exist.
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assert (
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membership_event_id is not None
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), "check_user_in_room_or_world_readable returned invalid data"
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room_state_events = await self.state_store.get_state_for_events(
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[membership_event_id], state_filter=state_filter
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)
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room_state = room_state_events[membership_event_id]
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now = self.clock.time_msec()
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events = await self._event_serializer.serialize_events(
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room_state.values(),
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now,
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# We don't bother bundling aggregations in when asked for state
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# events, as clients won't use them.
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bundle_aggregations=False,
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)
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return events
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async def get_joined_members(self, requester: Requester, room_id: str) -> dict:
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"""Get all the joined members in the room and their profile information.
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If the user has left the room return the state events from when they left.
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Args:
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requester: The user requesting state events.
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room_id: The room ID to get all state events from.
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Returns:
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A dict of user_id to profile info
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"""
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user_id = requester.user.to_string()
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if not requester.app_service:
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# We check AS auth after fetching the room membership, as it
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# requires us to pull out all joined members anyway.
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membership, _ = await self.auth.check_user_in_room_or_world_readable(
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room_id, user_id, allow_departed_users=True
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)
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if membership != Membership.JOIN:
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raise NotImplementedError(
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"Getting joined members after leaving is not implemented"
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)
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users_with_profile = await self.store.get_users_in_room_with_profiles(room_id)
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# If this is an AS, double check that they are allowed to see the members.
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# This can either be because the AS user is in the room or because there
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# is a user in the room that the AS is "interested in"
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if requester.app_service and user_id not in users_with_profile:
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for uid in users_with_profile:
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if requester.app_service.is_interested_in_user(uid):
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break
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else:
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# Loop fell through, AS has no interested users in room
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raise AuthError(403, "Appservice not in room")
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return {
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user_id: {
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"avatar_url": profile.avatar_url,
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"display_name": profile.display_name,
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}
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for user_id, profile in users_with_profile.items()
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}
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def maybe_schedule_expiry(self, event: EventBase):
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"""Schedule the expiry of an event if there's not already one scheduled,
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or if the one running is for an event that will expire after the provided
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timestamp.
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This function needs to invalidate the event cache, which is only possible on
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the master process, and therefore needs to be run on there.
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Args:
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event: The event to schedule the expiry of.
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"""
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expiry_ts = event.content.get(EventContentFields.SELF_DESTRUCT_AFTER)
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if not isinstance(expiry_ts, int) or event.is_state():
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return
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# _schedule_expiry_for_event won't actually schedule anything if there's already
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# a task scheduled for a timestamp that's sooner than the provided one.
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self._schedule_expiry_for_event(event.event_id, expiry_ts)
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async def _schedule_next_expiry(self):
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"""Retrieve the ID and the expiry timestamp of the next event to be expired,
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and schedule an expiry task for it.
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If there's no event left to expire, set _expiry_scheduled to None so that a
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future call to save_expiry_ts can schedule a new expiry task.
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"""
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# Try to get the expiry timestamp of the next event to expire.
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res = await self.store.get_next_event_to_expire()
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if res:
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event_id, expiry_ts = res
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self._schedule_expiry_for_event(event_id, expiry_ts)
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def _schedule_expiry_for_event(self, event_id: str, expiry_ts: int):
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"""Schedule an expiry task for the provided event if there's not already one
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scheduled at a timestamp that's sooner than the provided one.
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Args:
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event_id: The ID of the event to expire.
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expiry_ts: The timestamp at which to expire the event.
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"""
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if self._scheduled_expiry:
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# If the provided timestamp refers to a time before the scheduled time of the
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# next expiry task, cancel that task and reschedule it for this timestamp.
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next_scheduled_expiry_ts = self._scheduled_expiry.getTime() * 1000
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if expiry_ts < next_scheduled_expiry_ts:
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self._scheduled_expiry.cancel()
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else:
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return
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# Figure out how many seconds we need to wait before expiring the event.
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now_ms = self.clock.time_msec()
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delay = (expiry_ts - now_ms) / 1000
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# callLater doesn't support negative delays, so trim the delay to 0 if we're
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# in that case.
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if delay < 0:
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delay = 0
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logger.info("Scheduling expiry for event %s in %.3fs", event_id, delay)
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self._scheduled_expiry = self.clock.call_later(
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delay,
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run_as_background_process,
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"_expire_event",
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self._expire_event,
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event_id,
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)
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async def _expire_event(self, event_id: str):
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"""Retrieve and expire an event that needs to be expired from the database.
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If the event doesn't exist in the database, log it and delete the expiry date
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from the database (so that we don't try to expire it again).
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"""
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assert self._ephemeral_events_enabled
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self._scheduled_expiry = None
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logger.info("Expiring event %s", event_id)
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try:
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# Expire the event if we know about it. This function also deletes the expiry
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# date from the database in the same database transaction.
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await self.store.expire_event(event_id)
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except Exception as e:
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logger.error("Could not expire event %s: %r", event_id, e)
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# Schedule the expiry of the next event to expire.
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await self._schedule_next_expiry()
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# The duration (in ms) after which rooms should be removed
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# `_rooms_to_exclude_from_dummy_event_insertion` (with the effect that we will try
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# to generate a dummy event for them once more)
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#
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_DUMMY_EVENT_ROOM_EXCLUSION_EXPIRY = 7 * 24 * 60 * 60 * 1000
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|
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class EventCreationHandler:
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def __init__(self, hs: "HomeServer"):
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self.hs = hs
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self.auth = hs.get_auth()
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self._event_auth_handler = hs.get_event_auth_handler()
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self.store = hs.get_datastore()
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self.storage = hs.get_storage()
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self.state = hs.get_state_handler()
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self.clock = hs.get_clock()
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self.validator = EventValidator()
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self.profile_handler = hs.get_profile_handler()
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self.event_builder_factory = hs.get_event_builder_factory()
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self.server_name = hs.hostname
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self.notifier = hs.get_notifier()
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self.config = hs.config
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self.require_membership_for_aliases = hs.config.require_membership_for_aliases
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self._events_shard_config = self.config.worker.events_shard_config
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self._instance_name = hs.get_instance_name()
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self.room_prejoin_state_types = self.hs.config.api.room_prejoin_state
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self.membership_types_to_include_profile_data_in = {
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Membership.JOIN,
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Membership.KNOCK,
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}
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if self.hs.config.include_profile_data_on_invite:
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self.membership_types_to_include_profile_data_in.add(Membership.INVITE)
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self.send_event = ReplicationSendEventRestServlet.make_client(hs)
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# This is only used to get at ratelimit function
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self.base_handler = BaseHandler(hs)
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# We arbitrarily limit concurrent event creation for a room to 5.
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# This is to stop us from diverging history *too* much.
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self.limiter = Linearizer(max_count=5, name="room_event_creation_limit")
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self.action_generator = hs.get_action_generator()
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self.spam_checker = hs.get_spam_checker()
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self.third_party_event_rules: "ThirdPartyEventRules" = (
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self.hs.get_third_party_event_rules()
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)
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self._block_events_without_consent_error = (
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self.config.block_events_without_consent_error
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)
|
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# we need to construct a ConsentURIBuilder here, as it checks that the necessary
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# config options, but *only* if we have a configuration for which we are
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# going to need it.
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if self._block_events_without_consent_error:
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self._consent_uri_builder = ConsentURIBuilder(self.config)
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# Rooms which should be excluded from dummy insertion. (For instance,
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# those without local users who can send events into the room).
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#
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# map from room id to time-of-last-attempt.
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#
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self._rooms_to_exclude_from_dummy_event_insertion: Dict[str, int] = {}
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# The number of forward extremeities before a dummy event is sent.
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self._dummy_events_threshold = hs.config.dummy_events_threshold
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|
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if (
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self.config.worker.run_background_tasks
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and self.config.cleanup_extremities_with_dummy_events
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):
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self.clock.looping_call(
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lambda: run_as_background_process(
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"send_dummy_events_to_fill_extremities",
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self._send_dummy_events_to_fill_extremities,
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),
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5 * 60 * 1000,
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)
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|
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self._message_handler = hs.get_message_handler()
|
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|
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self._ephemeral_events_enabled = hs.config.enable_ephemeral_messages
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|
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self._external_cache = hs.get_external_cache()
|
|
|
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# Stores the state groups we've recently added to the joined hosts
|
|
# external cache. Note that the timeout must be significantly less than
|
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# the TTL on the external cache.
|
|
self._external_cache_joined_hosts_updates: Optional[ExpiringCache] = None
|
|
if self._external_cache.is_enabled():
|
|
self._external_cache_joined_hosts_updates = ExpiringCache(
|
|
"_external_cache_joined_hosts_updates",
|
|
self.clock,
|
|
expiry_ms=30 * 60 * 1000,
|
|
)
|
|
|
|
async def create_event(
|
|
self,
|
|
requester: Requester,
|
|
event_dict: dict,
|
|
txn_id: Optional[str] = None,
|
|
prev_event_ids: Optional[List[str]] = None,
|
|
auth_event_ids: Optional[List[str]] = None,
|
|
require_consent: bool = True,
|
|
outlier: bool = False,
|
|
historical: bool = False,
|
|
depth: Optional[int] = None,
|
|
) -> Tuple[EventBase, EventContext]:
|
|
"""
|
|
Given a dict from a client, create a new event.
|
|
|
|
Creates an FrozenEvent object, filling out auth_events, prev_events,
|
|
etc.
|
|
|
|
Adds display names to Join membership events.
|
|
|
|
Args:
|
|
requester
|
|
event_dict: An entire event
|
|
txn_id
|
|
prev_event_ids:
|
|
the forward extremities to use as the prev_events for the
|
|
new event.
|
|
|
|
If None, they will be requested from the database.
|
|
|
|
auth_event_ids:
|
|
The event ids to use as the auth_events for the new event.
|
|
Should normally be left as None, which will cause them to be calculated
|
|
based on the room state at the prev_events.
|
|
|
|
If non-None, prev_event_ids must also be provided.
|
|
|
|
require_consent: Whether to check if the requester has
|
|
consented to the privacy policy.
|
|
|
|
outlier: Indicates whether the event is an `outlier`, i.e. if
|
|
it's from an arbitrary point and floating in the DAG as
|
|
opposed to being inline with the current DAG.
|
|
historical: Indicates whether the message is being inserted
|
|
back in time around some existing events. This is used to skip
|
|
a few checks and mark the event as backfilled.
|
|
depth: Override the depth used to order the event in the DAG.
|
|
Should normally be set to None, which will cause the depth to be calculated
|
|
based on the prev_events.
|
|
|
|
Raises:
|
|
ResourceLimitError if server is blocked to some resource being
|
|
exceeded
|
|
Returns:
|
|
Tuple of created event, Context
|
|
"""
|
|
await self.auth.check_auth_blocking(requester=requester)
|
|
|
|
if event_dict["type"] == EventTypes.Create and event_dict["state_key"] == "":
|
|
room_version = event_dict["content"]["room_version"]
|
|
else:
|
|
try:
|
|
room_version = await self.store.get_room_version_id(
|
|
event_dict["room_id"]
|
|
)
|
|
except NotFoundError:
|
|
raise AuthError(403, "Unknown room")
|
|
|
|
builder = self.event_builder_factory.new(room_version, event_dict)
|
|
|
|
self.validator.validate_builder(builder)
|
|
|
|
if builder.type == EventTypes.Member:
|
|
membership = builder.content.get("membership", None)
|
|
target = UserID.from_string(builder.state_key)
|
|
|
|
if membership in self.membership_types_to_include_profile_data_in:
|
|
# If event doesn't include a display name, add one.
|
|
profile = self.profile_handler
|
|
content = builder.content
|
|
|
|
try:
|
|
if "displayname" not in content:
|
|
displayname = await profile.get_displayname(target)
|
|
if displayname is not None:
|
|
content["displayname"] = displayname
|
|
if "avatar_url" not in content:
|
|
avatar_url = await profile.get_avatar_url(target)
|
|
if avatar_url is not None:
|
|
content["avatar_url"] = avatar_url
|
|
except Exception as e:
|
|
logger.info(
|
|
"Failed to get profile information for %r: %s", target, e
|
|
)
|
|
|
|
is_exempt = await self._is_exempt_from_privacy_policy(builder, requester)
|
|
if require_consent and not is_exempt:
|
|
await self.assert_accepted_privacy_policy(requester)
|
|
|
|
if requester.access_token_id is not None:
|
|
builder.internal_metadata.token_id = requester.access_token_id
|
|
|
|
if txn_id is not None:
|
|
builder.internal_metadata.txn_id = txn_id
|
|
|
|
builder.internal_metadata.outlier = outlier
|
|
|
|
builder.internal_metadata.historical = historical
|
|
|
|
# Strip down the auth_event_ids to only what we need to auth the event.
|
|
# For example, we don't need extra m.room.member that don't match event.sender
|
|
if auth_event_ids is not None:
|
|
# If auth events are provided, prev events must be also.
|
|
assert prev_event_ids is not None
|
|
|
|
temp_event = await builder.build(
|
|
prev_event_ids=prev_event_ids,
|
|
auth_event_ids=auth_event_ids,
|
|
depth=depth,
|
|
)
|
|
auth_events = await self.store.get_events_as_list(auth_event_ids)
|
|
# Create a StateMap[str]
|
|
auth_event_state_map = {
|
|
(e.type, e.state_key): e.event_id for e in auth_events
|
|
}
|
|
# Actually strip down and use the necessary auth events
|
|
auth_event_ids = self._event_auth_handler.compute_auth_events(
|
|
event=temp_event,
|
|
current_state_ids=auth_event_state_map,
|
|
for_verification=False,
|
|
)
|
|
|
|
event, context = await self.create_new_client_event(
|
|
builder=builder,
|
|
requester=requester,
|
|
prev_event_ids=prev_event_ids,
|
|
auth_event_ids=auth_event_ids,
|
|
depth=depth,
|
|
)
|
|
|
|
# In an ideal world we wouldn't need the second part of this condition. However,
|
|
# this behaviour isn't spec'd yet, meaning we should be able to deactivate this
|
|
# behaviour. Another reason is that this code is also evaluated each time a new
|
|
# m.room.aliases event is created, which includes hitting a /directory route.
|
|
# Therefore not including this condition here would render the similar one in
|
|
# synapse.handlers.directory pointless.
|
|
if builder.type == EventTypes.Aliases and self.require_membership_for_aliases:
|
|
# Ideally we'd do the membership check in event_auth.check(), which
|
|
# describes a spec'd algorithm for authenticating events received over
|
|
# federation as well as those created locally. As of room v3, aliases events
|
|
# can be created by users that are not in the room, therefore we have to
|
|
# tolerate them in event_auth.check().
|
|
prev_state_ids = await context.get_prev_state_ids()
|
|
prev_event_id = prev_state_ids.get((EventTypes.Member, event.sender))
|
|
prev_event = (
|
|
await self.store.get_event(prev_event_id, allow_none=True)
|
|
if prev_event_id
|
|
else None
|
|
)
|
|
if not prev_event or prev_event.membership != Membership.JOIN:
|
|
logger.warning(
|
|
(
|
|
"Attempt to send `m.room.aliases` in room %s by user %s but"
|
|
" membership is %s"
|
|
),
|
|
event.room_id,
|
|
event.sender,
|
|
prev_event.membership if prev_event else None,
|
|
)
|
|
|
|
raise AuthError(
|
|
403, "You must be in the room to create an alias for it"
|
|
)
|
|
|
|
self.validator.validate_new(event, self.config)
|
|
|
|
return (event, context)
|
|
|
|
async def _is_exempt_from_privacy_policy(
|
|
self, builder: EventBuilder, requester: Requester
|
|
) -> bool:
|
|
""" "Determine if an event to be sent is exempt from having to consent
|
|
to the privacy policy
|
|
|
|
Args:
|
|
builder: event being created
|
|
requester: user requesting this event
|
|
|
|
Returns:
|
|
true if the event can be sent without the user consenting
|
|
"""
|
|
# the only thing the user can do is join the server notices room.
|
|
if builder.type == EventTypes.Member:
|
|
membership = builder.content.get("membership", None)
|
|
if membership == Membership.JOIN:
|
|
return await self._is_server_notices_room(builder.room_id)
|
|
elif membership == Membership.LEAVE:
|
|
# the user is always allowed to leave (but not kick people)
|
|
return builder.state_key == requester.user.to_string()
|
|
return False
|
|
|
|
async def _is_server_notices_room(self, room_id: str) -> bool:
|
|
if self.config.server_notices_mxid is None:
|
|
return False
|
|
user_ids = await self.store.get_users_in_room(room_id)
|
|
return self.config.server_notices_mxid in user_ids
|
|
|
|
async def assert_accepted_privacy_policy(self, requester: Requester) -> None:
|
|
"""Check if a user has accepted the privacy policy
|
|
|
|
Called when the given user is about to do something that requires
|
|
privacy consent. We see if the user is exempt and otherwise check that
|
|
they have given consent. If they have not, a ConsentNotGiven error is
|
|
raised.
|
|
|
|
Args:
|
|
requester: The user making the request
|
|
|
|
Returns:
|
|
Returns normally if the user has consented or is exempt
|
|
|
|
Raises:
|
|
ConsentNotGivenError: if the user has not given consent yet
|
|
"""
|
|
if self._block_events_without_consent_error is None:
|
|
return
|
|
|
|
# exempt AS users from needing consent
|
|
if requester.app_service is not None:
|
|
return
|
|
|
|
user_id = requester.authenticated_entity
|
|
if not user_id.startswith("@"):
|
|
# The authenticated entity might not be a user, e.g. if it's the
|
|
# server puppetting the user.
|
|
return
|
|
|
|
user = UserID.from_string(user_id)
|
|
|
|
# exempt the system notices user
|
|
if (
|
|
self.config.server_notices_mxid is not None
|
|
and user_id == self.config.server_notices_mxid
|
|
):
|
|
return
|
|
|
|
u = await self.store.get_user_by_id(user_id)
|
|
assert u is not None
|
|
if u["user_type"] in (UserTypes.SUPPORT, UserTypes.BOT):
|
|
# support and bot users are not required to consent
|
|
return
|
|
if u["appservice_id"] is not None:
|
|
# users registered by an appservice are exempt
|
|
return
|
|
if u["consent_version"] == self.config.user_consent_version:
|
|
return
|
|
|
|
consent_uri = self._consent_uri_builder.build_user_consent_uri(user.localpart)
|
|
msg = self._block_events_without_consent_error % {"consent_uri": consent_uri}
|
|
raise ConsentNotGivenError(msg=msg, consent_uri=consent_uri)
|
|
|
|
async def deduplicate_state_event(
|
|
self, event: EventBase, context: EventContext
|
|
) -> Optional[EventBase]:
|
|
"""
|
|
Checks whether event is in the latest resolved state in context.
|
|
|
|
Args:
|
|
event: The event to check for duplication.
|
|
context: The event context.
|
|
|
|
Returns:
|
|
The previous version of the event is returned, if it is found in the
|
|
event context. Otherwise, None is returned.
|
|
"""
|
|
prev_state_ids = await context.get_prev_state_ids()
|
|
prev_event_id = prev_state_ids.get((event.type, event.state_key))
|
|
if not prev_event_id:
|
|
return None
|
|
prev_event = await self.store.get_event(prev_event_id, allow_none=True)
|
|
if not prev_event:
|
|
return None
|
|
|
|
if prev_event and event.user_id == prev_event.user_id:
|
|
prev_content = encode_canonical_json(prev_event.content)
|
|
next_content = encode_canonical_json(event.content)
|
|
if prev_content == next_content:
|
|
return prev_event
|
|
return None
|
|
|
|
async def create_and_send_nonmember_event(
|
|
self,
|
|
requester: Requester,
|
|
event_dict: dict,
|
|
prev_event_ids: Optional[List[str]] = None,
|
|
auth_event_ids: Optional[List[str]] = None,
|
|
ratelimit: bool = True,
|
|
txn_id: Optional[str] = None,
|
|
ignore_shadow_ban: bool = False,
|
|
outlier: bool = False,
|
|
historical: bool = False,
|
|
depth: Optional[int] = None,
|
|
) -> Tuple[EventBase, int]:
|
|
"""
|
|
Creates an event, then sends it.
|
|
|
|
See self.create_event and self.handle_new_client_event.
|
|
|
|
Args:
|
|
requester: The requester sending the event.
|
|
event_dict: An entire event.
|
|
prev_event_ids:
|
|
The event IDs to use as the prev events.
|
|
Should normally be left as None to automatically request them
|
|
from the database.
|
|
auth_event_ids:
|
|
The event ids to use as the auth_events for the new event.
|
|
Should normally be left as None, which will cause them to be calculated
|
|
based on the room state at the prev_events.
|
|
|
|
If non-None, prev_event_ids must also be provided.
|
|
ratelimit: Whether to rate limit this send.
|
|
txn_id: The transaction ID.
|
|
ignore_shadow_ban: True if shadow-banned users should be allowed to
|
|
send this event.
|
|
outlier: Indicates whether the event is an `outlier`, i.e. if
|
|
it's from an arbitrary point and floating in the DAG as
|
|
opposed to being inline with the current DAG.
|
|
historical: Indicates whether the message is being inserted
|
|
back in time around some existing events. This is used to skip
|
|
a few checks and mark the event as backfilled.
|
|
depth: Override the depth used to order the event in the DAG.
|
|
Should normally be set to None, which will cause the depth to be calculated
|
|
based on the prev_events.
|
|
|
|
Returns:
|
|
The event, and its stream ordering (if deduplication happened,
|
|
the previous, duplicate event).
|
|
|
|
Raises:
|
|
ShadowBanError if the requester has been shadow-banned.
|
|
"""
|
|
|
|
if event_dict["type"] == EventTypes.Member:
|
|
raise SynapseError(
|
|
500, "Tried to send member event through non-member codepath"
|
|
)
|
|
|
|
if not ignore_shadow_ban and requester.shadow_banned:
|
|
# We randomly sleep a bit just to annoy the requester.
|
|
await self.clock.sleep(random.randint(1, 10))
|
|
raise ShadowBanError()
|
|
|
|
# We limit the number of concurrent event sends in a room so that we
|
|
# don't fork the DAG too much. If we don't limit then we can end up in
|
|
# a situation where event persistence can't keep up, causing
|
|
# extremities to pile up, which in turn leads to state resolution
|
|
# taking longer.
|
|
with (await self.limiter.queue(event_dict["room_id"])):
|
|
if txn_id and requester.access_token_id:
|
|
existing_event_id = await self.store.get_event_id_from_transaction_id(
|
|
event_dict["room_id"],
|
|
requester.user.to_string(),
|
|
requester.access_token_id,
|
|
txn_id,
|
|
)
|
|
if existing_event_id:
|
|
event = await self.store.get_event(existing_event_id)
|
|
# we know it was persisted, so must have a stream ordering
|
|
assert event.internal_metadata.stream_ordering
|
|
return event, event.internal_metadata.stream_ordering
|
|
|
|
event, context = await self.create_event(
|
|
requester,
|
|
event_dict,
|
|
txn_id=txn_id,
|
|
prev_event_ids=prev_event_ids,
|
|
auth_event_ids=auth_event_ids,
|
|
outlier=outlier,
|
|
historical=historical,
|
|
depth=depth,
|
|
)
|
|
|
|
assert self.hs.is_mine_id(event.sender), "User must be our own: %s" % (
|
|
event.sender,
|
|
)
|
|
|
|
spam_error = await self.spam_checker.check_event_for_spam(event)
|
|
if spam_error:
|
|
if not isinstance(spam_error, str):
|
|
spam_error = "Spam is not permitted here"
|
|
raise SynapseError(403, spam_error, Codes.FORBIDDEN)
|
|
|
|
ev = await self.handle_new_client_event(
|
|
requester=requester,
|
|
event=event,
|
|
context=context,
|
|
ratelimit=ratelimit,
|
|
ignore_shadow_ban=ignore_shadow_ban,
|
|
)
|
|
|
|
# we know it was persisted, so must have a stream ordering
|
|
assert ev.internal_metadata.stream_ordering
|
|
return ev, ev.internal_metadata.stream_ordering
|
|
|
|
@measure_func("create_new_client_event")
|
|
async def create_new_client_event(
|
|
self,
|
|
builder: EventBuilder,
|
|
requester: Optional[Requester] = None,
|
|
prev_event_ids: Optional[List[str]] = None,
|
|
auth_event_ids: Optional[List[str]] = None,
|
|
depth: Optional[int] = None,
|
|
) -> Tuple[EventBase, EventContext]:
|
|
"""Create a new event for a local client
|
|
|
|
Args:
|
|
builder:
|
|
requester:
|
|
prev_event_ids:
|
|
the forward extremities to use as the prev_events for the
|
|
new event.
|
|
|
|
If None, they will be requested from the database.
|
|
|
|
auth_event_ids:
|
|
The event ids to use as the auth_events for the new event.
|
|
Should normally be left as None, which will cause them to be calculated
|
|
based on the room state at the prev_events.
|
|
|
|
depth: Override the depth used to order the event in the DAG.
|
|
Should normally be set to None, which will cause the depth to be calculated
|
|
based on the prev_events.
|
|
|
|
Returns:
|
|
Tuple of created event, context
|
|
"""
|
|
|
|
if prev_event_ids is not None:
|
|
assert (
|
|
len(prev_event_ids) <= 10
|
|
), "Attempting to create an event with %i prev_events" % (
|
|
len(prev_event_ids),
|
|
)
|
|
else:
|
|
prev_event_ids = await self.store.get_prev_events_for_room(builder.room_id)
|
|
|
|
# we now ought to have some prev_events (unless it's a create event).
|
|
#
|
|
# do a quick sanity check here, rather than waiting until we've created the
|
|
# event and then try to auth it (which fails with a somewhat confusing "No
|
|
# create event in auth events")
|
|
assert (
|
|
builder.type == EventTypes.Create or len(prev_event_ids) > 0
|
|
), "Attempting to create an event with no prev_events"
|
|
|
|
event = await builder.build(
|
|
prev_event_ids=prev_event_ids,
|
|
auth_event_ids=auth_event_ids,
|
|
depth=depth,
|
|
)
|
|
|
|
old_state = None
|
|
|
|
# Pass on the outlier property from the builder to the event
|
|
# after it is created
|
|
if builder.internal_metadata.outlier:
|
|
event.internal_metadata.outlier = builder.internal_metadata.outlier
|
|
|
|
# Calculate the state for outliers that pass in their own `auth_event_ids`
|
|
if auth_event_ids:
|
|
old_state = await self.store.get_events_as_list(auth_event_ids)
|
|
|
|
context = await self.state.compute_event_context(event, old_state=old_state)
|
|
|
|
if requester:
|
|
context.app_service = requester.app_service
|
|
|
|
res, new_content = await self.third_party_event_rules.check_event_allowed(
|
|
event, context
|
|
)
|
|
if res is False:
|
|
logger.info(
|
|
"Event %s forbidden by third-party rules",
|
|
event,
|
|
)
|
|
raise SynapseError(
|
|
403, "This event is not allowed in this context", Codes.FORBIDDEN
|
|
)
|
|
elif new_content is not None:
|
|
# the third-party rules want to replace the event. We'll need to build a new
|
|
# event.
|
|
event, context = await self._rebuild_event_after_third_party_rules(
|
|
new_content, event
|
|
)
|
|
|
|
self.validator.validate_new(event, self.config)
|
|
|
|
# If this event is an annotation then we check that that the sender
|
|
# can't annotate the same way twice (e.g. stops users from liking an
|
|
# event multiple times).
|
|
relation = event.content.get("m.relates_to", {})
|
|
if relation.get("rel_type") == RelationTypes.ANNOTATION:
|
|
relates_to = relation["event_id"]
|
|
aggregation_key = relation["key"]
|
|
|
|
already_exists = await self.store.has_user_annotated_event(
|
|
relates_to, event.type, aggregation_key, event.sender
|
|
)
|
|
if already_exists:
|
|
raise SynapseError(400, "Can't send same reaction twice")
|
|
|
|
logger.debug("Created event %s", event.event_id)
|
|
|
|
return (event, context)
|
|
|
|
@measure_func("handle_new_client_event")
|
|
async def handle_new_client_event(
|
|
self,
|
|
requester: Requester,
|
|
event: EventBase,
|
|
context: EventContext,
|
|
ratelimit: bool = True,
|
|
extra_users: Optional[List[UserID]] = None,
|
|
ignore_shadow_ban: bool = False,
|
|
) -> EventBase:
|
|
"""Processes a new event.
|
|
|
|
This includes deduplicating, checking auth, persisting,
|
|
notifying users, sending to remote servers, etc.
|
|
|
|
If called from a worker will hit out to the master process for final
|
|
processing.
|
|
|
|
Args:
|
|
requester
|
|
event
|
|
context
|
|
ratelimit
|
|
extra_users: Any extra users to notify about event
|
|
|
|
ignore_shadow_ban: True if shadow-banned users should be allowed to
|
|
send this event.
|
|
|
|
Return:
|
|
If the event was deduplicated, the previous, duplicate, event. Otherwise,
|
|
`event`.
|
|
|
|
Raises:
|
|
ShadowBanError if the requester has been shadow-banned.
|
|
"""
|
|
extra_users = extra_users or []
|
|
|
|
# we don't apply shadow-banning to membership events here. Invites are blocked
|
|
# higher up the stack, and we allow shadow-banned users to send join and leave
|
|
# events as normal.
|
|
if (
|
|
event.type != EventTypes.Member
|
|
and not ignore_shadow_ban
|
|
and requester.shadow_banned
|
|
):
|
|
# We randomly sleep a bit just to annoy the requester.
|
|
await self.clock.sleep(random.randint(1, 10))
|
|
raise ShadowBanError()
|
|
|
|
if event.is_state():
|
|
prev_event = await self.deduplicate_state_event(event, context)
|
|
if prev_event is not None:
|
|
logger.info(
|
|
"Not bothering to persist state event %s duplicated by %s",
|
|
event.event_id,
|
|
prev_event.event_id,
|
|
)
|
|
return prev_event
|
|
|
|
if event.is_state() and (event.type, event.state_key) == (
|
|
EventTypes.Create,
|
|
"",
|
|
):
|
|
room_version = event.content.get("room_version", RoomVersions.V1.identifier)
|
|
else:
|
|
room_version = await self.store.get_room_version_id(event.room_id)
|
|
|
|
if event.internal_metadata.is_out_of_band_membership():
|
|
# the only sort of out-of-band-membership events we expect to see here are
|
|
# invite rejections and rescinded knocks that we have generated ourselves.
|
|
assert event.type == EventTypes.Member
|
|
assert event.content["membership"] == Membership.LEAVE
|
|
else:
|
|
try:
|
|
await self._event_auth_handler.check_from_context(
|
|
room_version, event, context
|
|
)
|
|
except AuthError as err:
|
|
logger.warning("Denying new event %r because %s", event, err)
|
|
raise err
|
|
|
|
# Ensure that we can round trip before trying to persist in db
|
|
try:
|
|
dump = json_encoder.encode(event.content)
|
|
json_decoder.decode(dump)
|
|
except Exception:
|
|
logger.exception("Failed to encode content: %r", event.content)
|
|
raise
|
|
|
|
# We now persist the event (and update the cache in parallel, since we
|
|
# don't want to block on it).
|
|
result = await make_deferred_yieldable(
|
|
defer.gatherResults(
|
|
[
|
|
run_in_background(
|
|
self._persist_event,
|
|
requester=requester,
|
|
event=event,
|
|
context=context,
|
|
ratelimit=ratelimit,
|
|
extra_users=extra_users,
|
|
),
|
|
run_in_background(
|
|
self.cache_joined_hosts_for_event, event, context
|
|
).addErrback(log_failure, "cache_joined_hosts_for_event failed"),
|
|
],
|
|
consumeErrors=True,
|
|
)
|
|
).addErrback(unwrapFirstError)
|
|
|
|
return result[0]
|
|
|
|
async def _persist_event(
|
|
self,
|
|
requester: Requester,
|
|
event: EventBase,
|
|
context: EventContext,
|
|
ratelimit: bool = True,
|
|
extra_users: Optional[List[UserID]] = None,
|
|
) -> EventBase:
|
|
"""Actually persists the event. Should only be called by
|
|
`handle_new_client_event`, and see its docstring for documentation of
|
|
the arguments.
|
|
"""
|
|
|
|
# Skip push notification actions for historical messages
|
|
# because we don't want to notify people about old history back in time.
|
|
# The historical messages also do not have the proper `context.current_state_ids`
|
|
# and `state_groups` because they have `prev_events` that aren't persisted yet
|
|
# (historical messages persisted in reverse-chronological order).
|
|
if not event.internal_metadata.is_historical():
|
|
await self.action_generator.handle_push_actions_for_event(event, context)
|
|
|
|
try:
|
|
# If we're a worker we need to hit out to the master.
|
|
writer_instance = self._events_shard_config.get_instance(event.room_id)
|
|
if writer_instance != self._instance_name:
|
|
result = await self.send_event(
|
|
instance_name=writer_instance,
|
|
event_id=event.event_id,
|
|
store=self.store,
|
|
requester=requester,
|
|
event=event,
|
|
context=context,
|
|
ratelimit=ratelimit,
|
|
extra_users=extra_users,
|
|
)
|
|
stream_id = result["stream_id"]
|
|
event_id = result["event_id"]
|
|
if event_id != event.event_id:
|
|
# If we get a different event back then it means that its
|
|
# been de-duplicated, so we replace the given event with the
|
|
# one already persisted.
|
|
event = await self.store.get_event(event_id)
|
|
else:
|
|
# If we newly persisted the event then we need to update its
|
|
# stream_ordering entry manually (as it was persisted on
|
|
# another worker).
|
|
event.internal_metadata.stream_ordering = stream_id
|
|
return event
|
|
|
|
event = await self.persist_and_notify_client_event(
|
|
requester, event, context, ratelimit=ratelimit, extra_users=extra_users
|
|
)
|
|
|
|
return event
|
|
except Exception:
|
|
# Ensure that we actually remove the entries in the push actions
|
|
# staging area, if we calculated them.
|
|
await self.store.remove_push_actions_from_staging(event.event_id)
|
|
raise
|
|
|
|
async def cache_joined_hosts_for_event(
|
|
self, event: EventBase, context: EventContext
|
|
) -> None:
|
|
"""Precalculate the joined hosts at the event, when using Redis, so that
|
|
external federation senders don't have to recalculate it themselves.
|
|
"""
|
|
|
|
if not self._external_cache.is_enabled():
|
|
return
|
|
|
|
# If external cache is enabled we should always have this.
|
|
assert self._external_cache_joined_hosts_updates is not None
|
|
|
|
# We actually store two mappings, event ID -> prev state group,
|
|
# state group -> joined hosts, which is much more space efficient
|
|
# than event ID -> joined hosts.
|
|
#
|
|
# Note: We have to cache event ID -> prev state group, as we don't
|
|
# store that in the DB.
|
|
#
|
|
# Note: We set the state group -> joined hosts cache if it hasn't been
|
|
# set for a while, so that the expiry time is reset.
|
|
|
|
state_entry = await self.state.resolve_state_groups_for_events(
|
|
event.room_id, event_ids=event.prev_event_ids()
|
|
)
|
|
|
|
if state_entry.state_group:
|
|
await self._external_cache.set(
|
|
"event_to_prev_state_group",
|
|
event.event_id,
|
|
state_entry.state_group,
|
|
expiry_ms=60 * 60 * 1000,
|
|
)
|
|
|
|
if state_entry.state_group in self._external_cache_joined_hosts_updates:
|
|
return
|
|
|
|
joined_hosts = await self.store.get_joined_hosts(event.room_id, state_entry)
|
|
|
|
# Note that the expiry times must be larger than the expiry time in
|
|
# _external_cache_joined_hosts_updates.
|
|
await self._external_cache.set(
|
|
"get_joined_hosts",
|
|
str(state_entry.state_group),
|
|
list(joined_hosts),
|
|
expiry_ms=60 * 60 * 1000,
|
|
)
|
|
|
|
self._external_cache_joined_hosts_updates[state_entry.state_group] = None
|
|
|
|
async def _validate_canonical_alias(
|
|
self, directory_handler, room_alias_str: str, expected_room_id: str
|
|
) -> None:
|
|
"""
|
|
Ensure that the given room alias points to the expected room ID.
|
|
|
|
Args:
|
|
directory_handler: The directory handler object.
|
|
room_alias_str: The room alias to check.
|
|
expected_room_id: The room ID that the alias should point to.
|
|
"""
|
|
room_alias = RoomAlias.from_string(room_alias_str)
|
|
try:
|
|
mapping = await directory_handler.get_association(room_alias)
|
|
except SynapseError as e:
|
|
# Turn M_NOT_FOUND errors into M_BAD_ALIAS errors.
|
|
if e.errcode == Codes.NOT_FOUND:
|
|
raise SynapseError(
|
|
400,
|
|
"Room alias %s does not point to the room" % (room_alias_str,),
|
|
Codes.BAD_ALIAS,
|
|
)
|
|
raise
|
|
|
|
if mapping["room_id"] != expected_room_id:
|
|
raise SynapseError(
|
|
400,
|
|
"Room alias %s does not point to the room" % (room_alias_str,),
|
|
Codes.BAD_ALIAS,
|
|
)
|
|
|
|
async def persist_and_notify_client_event(
|
|
self,
|
|
requester: Requester,
|
|
event: EventBase,
|
|
context: EventContext,
|
|
ratelimit: bool = True,
|
|
extra_users: Optional[List[UserID]] = None,
|
|
) -> EventBase:
|
|
"""Called when we have fully built the event, have already
|
|
calculated the push actions for the event, and checked auth.
|
|
|
|
This should only be run on the instance in charge of persisting events.
|
|
|
|
Returns:
|
|
The persisted event. This may be different than the given event if
|
|
it was de-duplicated (e.g. because we had already persisted an
|
|
event with the same transaction ID.)
|
|
"""
|
|
extra_users = extra_users or []
|
|
|
|
assert self.storage.persistence is not None
|
|
assert self._events_shard_config.should_handle(
|
|
self._instance_name, event.room_id
|
|
)
|
|
|
|
if ratelimit:
|
|
# We check if this is a room admin redacting an event so that we
|
|
# can apply different ratelimiting. We do this by simply checking
|
|
# it's not a self-redaction (to avoid having to look up whether the
|
|
# user is actually admin or not).
|
|
is_admin_redaction = False
|
|
if event.type == EventTypes.Redaction:
|
|
original_event = await self.store.get_event(
|
|
event.redacts,
|
|
redact_behaviour=EventRedactBehaviour.AS_IS,
|
|
get_prev_content=False,
|
|
allow_rejected=False,
|
|
allow_none=True,
|
|
)
|
|
|
|
is_admin_redaction = bool(
|
|
original_event and event.sender != original_event.sender
|
|
)
|
|
|
|
await self.base_handler.ratelimit(
|
|
requester, is_admin_redaction=is_admin_redaction
|
|
)
|
|
|
|
await self._maybe_kick_guest_users(event, context)
|
|
|
|
if event.type == EventTypes.CanonicalAlias:
|
|
# Validate a newly added alias or newly added alt_aliases.
|
|
|
|
original_alias = None
|
|
original_alt_aliases: List[str] = []
|
|
|
|
original_event_id = event.unsigned.get("replaces_state")
|
|
if original_event_id:
|
|
original_event = await self.store.get_event(original_event_id)
|
|
|
|
if original_event:
|
|
original_alias = original_event.content.get("alias", None)
|
|
original_alt_aliases = original_event.content.get("alt_aliases", [])
|
|
|
|
# Check the alias is currently valid (if it has changed).
|
|
room_alias_str = event.content.get("alias", None)
|
|
directory_handler = self.hs.get_directory_handler()
|
|
if room_alias_str and room_alias_str != original_alias:
|
|
await self._validate_canonical_alias(
|
|
directory_handler, room_alias_str, event.room_id
|
|
)
|
|
|
|
# Check that alt_aliases is the proper form.
|
|
alt_aliases = event.content.get("alt_aliases", [])
|
|
if not isinstance(alt_aliases, (list, tuple)):
|
|
raise SynapseError(
|
|
400, "The alt_aliases property must be a list.", Codes.INVALID_PARAM
|
|
)
|
|
|
|
# If the old version of alt_aliases is of an unknown form,
|
|
# completely replace it.
|
|
if not isinstance(original_alt_aliases, (list, tuple)):
|
|
original_alt_aliases = []
|
|
|
|
# Check that each alias is currently valid.
|
|
new_alt_aliases = set(alt_aliases) - set(original_alt_aliases)
|
|
if new_alt_aliases:
|
|
for alias_str in new_alt_aliases:
|
|
await self._validate_canonical_alias(
|
|
directory_handler, alias_str, event.room_id
|
|
)
|
|
|
|
federation_handler = self.hs.get_federation_handler()
|
|
|
|
if event.type == EventTypes.Member:
|
|
if event.content["membership"] == Membership.INVITE:
|
|
event.unsigned[
|
|
"invite_room_state"
|
|
] = await self.store.get_stripped_room_state_from_event_context(
|
|
context,
|
|
self.room_prejoin_state_types,
|
|
membership_user_id=event.sender,
|
|
)
|
|
|
|
invitee = UserID.from_string(event.state_key)
|
|
if not self.hs.is_mine(invitee):
|
|
# TODO: Can we add signature from remote server in a nicer
|
|
# way? If we have been invited by a remote server, we need
|
|
# to get them to sign the event.
|
|
|
|
returned_invite = await federation_handler.send_invite(
|
|
invitee.domain, event
|
|
)
|
|
event.unsigned.pop("room_state", None)
|
|
|
|
# TODO: Make sure the signatures actually are correct.
|
|
event.signatures.update(returned_invite.signatures)
|
|
|
|
if event.content["membership"] == Membership.KNOCK:
|
|
event.unsigned[
|
|
"knock_room_state"
|
|
] = await self.store.get_stripped_room_state_from_event_context(
|
|
context,
|
|
self.room_prejoin_state_types,
|
|
)
|
|
|
|
if event.type == EventTypes.Redaction:
|
|
original_event = await self.store.get_event(
|
|
event.redacts,
|
|
redact_behaviour=EventRedactBehaviour.AS_IS,
|
|
get_prev_content=False,
|
|
allow_rejected=False,
|
|
allow_none=True,
|
|
)
|
|
|
|
room_version = await self.store.get_room_version_id(event.room_id)
|
|
room_version_obj = KNOWN_ROOM_VERSIONS[room_version]
|
|
|
|
# we can make some additional checks now if we have the original event.
|
|
if original_event:
|
|
if original_event.type == EventTypes.Create:
|
|
raise AuthError(403, "Redacting create events is not permitted")
|
|
|
|
if original_event.room_id != event.room_id:
|
|
raise SynapseError(400, "Cannot redact event from a different room")
|
|
|
|
if original_event.type == EventTypes.ServerACL:
|
|
raise AuthError(403, "Redacting server ACL events is not permitted")
|
|
|
|
# Add a little safety stop-gap to prevent people from trying to
|
|
# redact MSC2716 related events when they're in a room version
|
|
# which does not support it yet. We allow people to use MSC2716
|
|
# events in existing room versions but only from the room
|
|
# creator since it does not require any changes to the auth
|
|
# rules and in effect, the redaction algorithm . In the
|
|
# supported room version, we add the `historical` power level to
|
|
# auth the MSC2716 related events and adjust the redaction
|
|
# algorthim to keep the `historical` field around (redacting an
|
|
# event should only strip fields which don't affect the
|
|
# structural protocol level).
|
|
is_msc2716_event = (
|
|
original_event.type == EventTypes.MSC2716_INSERTION
|
|
or original_event.type == EventTypes.MSC2716_CHUNK
|
|
or original_event.type == EventTypes.MSC2716_MARKER
|
|
)
|
|
if not room_version_obj.msc2716_historical and is_msc2716_event:
|
|
raise AuthError(
|
|
403,
|
|
"Redacting MSC2716 events is not supported in this room version",
|
|
)
|
|
|
|
prev_state_ids = await context.get_prev_state_ids()
|
|
auth_events_ids = self._event_auth_handler.compute_auth_events(
|
|
event, prev_state_ids, for_verification=True
|
|
)
|
|
auth_events_map = await self.store.get_events(auth_events_ids)
|
|
auth_events = {(e.type, e.state_key): e for e in auth_events_map.values()}
|
|
|
|
if event_auth.check_redaction(
|
|
room_version_obj, event, auth_events=auth_events
|
|
):
|
|
# this user doesn't have 'redact' rights, so we need to do some more
|
|
# checks on the original event. Let's start by checking the original
|
|
# event exists.
|
|
if not original_event:
|
|
raise NotFoundError("Could not find event %s" % (event.redacts,))
|
|
|
|
if event.user_id != original_event.user_id:
|
|
raise AuthError(403, "You don't have permission to redact events")
|
|
|
|
# all the checks are done.
|
|
event.internal_metadata.recheck_redaction = False
|
|
|
|
if event.type == EventTypes.Create:
|
|
prev_state_ids = await context.get_prev_state_ids()
|
|
if prev_state_ids:
|
|
raise AuthError(403, "Changing the room create event is forbidden")
|
|
|
|
# Mark any `m.historical` messages as backfilled so they don't appear
|
|
# in `/sync` and have the proper decrementing `stream_ordering` as we import
|
|
backfilled = False
|
|
if event.internal_metadata.is_historical():
|
|
backfilled = True
|
|
|
|
# Note that this returns the event that was persisted, which may not be
|
|
# the same as we passed in if it was deduplicated due transaction IDs.
|
|
(
|
|
event,
|
|
event_pos,
|
|
max_stream_token,
|
|
) = await self.storage.persistence.persist_event(
|
|
event, context=context, backfilled=backfilled
|
|
)
|
|
|
|
if self._ephemeral_events_enabled:
|
|
# If there's an expiry timestamp on the event, schedule its expiry.
|
|
self._message_handler.maybe_schedule_expiry(event)
|
|
|
|
def _notify():
|
|
try:
|
|
self.notifier.on_new_room_event(
|
|
event, event_pos, max_stream_token, extra_users=extra_users
|
|
)
|
|
except Exception:
|
|
logger.exception("Error notifying about new room event")
|
|
|
|
run_in_background(_notify)
|
|
|
|
if event.type == EventTypes.Message:
|
|
# We don't want to block sending messages on any presence code. This
|
|
# matters as sometimes presence code can take a while.
|
|
run_in_background(self._bump_active_time, requester.user)
|
|
|
|
return event
|
|
|
|
async def _maybe_kick_guest_users(
|
|
self, event: EventBase, context: EventContext
|
|
) -> None:
|
|
if event.type != EventTypes.GuestAccess:
|
|
return
|
|
|
|
guest_access = event.content.get(EventContentFields.GUEST_ACCESS)
|
|
if guest_access == GuestAccess.CAN_JOIN:
|
|
return
|
|
|
|
current_state_ids = await context.get_current_state_ids()
|
|
|
|
# since this is a client-generated event, it cannot be an outlier and we must
|
|
# therefore have the state ids.
|
|
assert current_state_ids is not None
|
|
current_state_dict = await self.store.get_events(
|
|
list(current_state_ids.values())
|
|
)
|
|
current_state = list(current_state_dict.values())
|
|
logger.info("maybe_kick_guest_users %r", current_state)
|
|
await self.hs.get_room_member_handler().kick_guest_users(current_state)
|
|
|
|
async def _bump_active_time(self, user: UserID) -> None:
|
|
try:
|
|
presence = self.hs.get_presence_handler()
|
|
await presence.bump_presence_active_time(user)
|
|
except Exception:
|
|
logger.exception("Error bumping presence active time")
|
|
|
|
async def _send_dummy_events_to_fill_extremities(self):
|
|
"""Background task to send dummy events into rooms that have a large
|
|
number of extremities
|
|
"""
|
|
self._expire_rooms_to_exclude_from_dummy_event_insertion()
|
|
room_ids = await self.store.get_rooms_with_many_extremities(
|
|
min_count=self._dummy_events_threshold,
|
|
limit=5,
|
|
room_id_filter=self._rooms_to_exclude_from_dummy_event_insertion.keys(),
|
|
)
|
|
|
|
for room_id in room_ids:
|
|
dummy_event_sent = await self._send_dummy_event_for_room(room_id)
|
|
|
|
if not dummy_event_sent:
|
|
# Did not find a valid user in the room, so remove from future attempts
|
|
# Exclusion is time limited, so the room will be rechecked in the future
|
|
# dependent on _DUMMY_EVENT_ROOM_EXCLUSION_EXPIRY
|
|
logger.info(
|
|
"Failed to send dummy event into room %s. Will exclude it from "
|
|
"future attempts until cache expires" % (room_id,)
|
|
)
|
|
now = self.clock.time_msec()
|
|
self._rooms_to_exclude_from_dummy_event_insertion[room_id] = now
|
|
|
|
async def _send_dummy_event_for_room(self, room_id: str) -> bool:
|
|
"""Attempt to send a dummy event for the given room.
|
|
|
|
Args:
|
|
room_id: room to try to send an event from
|
|
|
|
Returns:
|
|
True if a dummy event was successfully sent. False if no user was able
|
|
to send an event.
|
|
"""
|
|
|
|
# For each room we need to find a joined member we can use to send
|
|
# the dummy event with.
|
|
latest_event_ids = await self.store.get_prev_events_for_room(room_id)
|
|
members = await self.state.get_current_users_in_room(
|
|
room_id, latest_event_ids=latest_event_ids
|
|
)
|
|
for user_id in members:
|
|
if not self.hs.is_mine_id(user_id):
|
|
continue
|
|
requester = create_requester(user_id, authenticated_entity=self.server_name)
|
|
try:
|
|
event, context = await self.create_event(
|
|
requester,
|
|
{
|
|
"type": EventTypes.Dummy,
|
|
"content": {},
|
|
"room_id": room_id,
|
|
"sender": user_id,
|
|
},
|
|
prev_event_ids=latest_event_ids,
|
|
)
|
|
|
|
event.internal_metadata.proactively_send = False
|
|
|
|
# Since this is a dummy-event it is OK if it is sent by a
|
|
# shadow-banned user.
|
|
await self.handle_new_client_event(
|
|
requester,
|
|
event,
|
|
context,
|
|
ratelimit=False,
|
|
ignore_shadow_ban=True,
|
|
)
|
|
return True
|
|
except AuthError:
|
|
logger.info(
|
|
"Failed to send dummy event into room %s for user %s due to "
|
|
"lack of power. Will try another user" % (room_id, user_id)
|
|
)
|
|
return False
|
|
|
|
def _expire_rooms_to_exclude_from_dummy_event_insertion(self):
|
|
expire_before = self.clock.time_msec() - _DUMMY_EVENT_ROOM_EXCLUSION_EXPIRY
|
|
to_expire = set()
|
|
for room_id, time in self._rooms_to_exclude_from_dummy_event_insertion.items():
|
|
if time < expire_before:
|
|
to_expire.add(room_id)
|
|
for room_id in to_expire:
|
|
logger.debug(
|
|
"Expiring room id %s from dummy event insertion exclusion cache",
|
|
room_id,
|
|
)
|
|
del self._rooms_to_exclude_from_dummy_event_insertion[room_id]
|
|
|
|
async def _rebuild_event_after_third_party_rules(
|
|
self, third_party_result: dict, original_event: EventBase
|
|
) -> Tuple[EventBase, EventContext]:
|
|
# the third_party_event_rules want to replace the event.
|
|
# we do some basic checks, and then return the replacement event and context.
|
|
|
|
# Construct a new EventBuilder and validate it, which helps with the
|
|
# rest of these checks.
|
|
try:
|
|
builder = self.event_builder_factory.for_room_version(
|
|
original_event.room_version, third_party_result
|
|
)
|
|
self.validator.validate_builder(builder)
|
|
except SynapseError as e:
|
|
raise Exception(
|
|
"Third party rules module created an invalid event: " + e.msg,
|
|
)
|
|
|
|
immutable_fields = [
|
|
# changing the room is going to break things: we've already checked that the
|
|
# room exists, and are holding a concurrency limiter token for that room.
|
|
# Also, we might need to use a different room version.
|
|
"room_id",
|
|
# changing the type or state key might work, but we'd need to check that the
|
|
# calling functions aren't making assumptions about them.
|
|
"type",
|
|
"state_key",
|
|
]
|
|
|
|
for k in immutable_fields:
|
|
if getattr(builder, k, None) != original_event.get(k):
|
|
raise Exception(
|
|
"Third party rules module created an invalid event: "
|
|
"cannot change field " + k
|
|
)
|
|
|
|
# check that the new sender belongs to this HS
|
|
if not self.hs.is_mine_id(builder.sender):
|
|
raise Exception(
|
|
"Third party rules module created an invalid event: "
|
|
"invalid sender " + builder.sender
|
|
)
|
|
|
|
# copy over the original internal metadata
|
|
for k, v in original_event.internal_metadata.get_dict().items():
|
|
setattr(builder.internal_metadata, k, v)
|
|
|
|
# modules can send new state events, so we re-calculate the auth events just in
|
|
# case.
|
|
prev_event_ids = await self.store.get_prev_events_for_room(builder.room_id)
|
|
|
|
event = await builder.build(
|
|
prev_event_ids=prev_event_ids,
|
|
auth_event_ids=None,
|
|
)
|
|
|
|
# we rebuild the event context, to be on the safe side. If nothing else,
|
|
# delta_ids might need an update.
|
|
context = await self.state.compute_event_context(event)
|
|
return event, context
|