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https://mau.dev/maunium/synapse.git
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c97251d5ba
This is being introduced as part of Sliding Sync but doesn't have any sliding window component. It's just a way to get E2EE events without having to sit through a big initial sync (`/sync` v2). And we can avoid encryption events being backed up by the main sync response or vice-versa. Part of some Sliding Sync simplification/experimentation. See [this discussion](https://github.com/element-hq/synapse/pull/17167#discussion_r1610495866) for why it may not be as useful as we thought. Based on: - https://github.com/matrix-org/matrix-spec-proposals/pull/3575 - https://github.com/matrix-org/matrix-spec-proposals/pull/3885 - https://github.com/matrix-org/matrix-spec-proposals/pull/3884
743 lines
28 KiB
Python
743 lines
28 KiB
Python
#
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# This file is licensed under the Affero General Public License (AGPL) version 3.
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#
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# Copyright 2015, 2016 OpenMarket Ltd
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# Copyright (C) 2023 New Vector, Ltd
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# See the GNU Affero General Public License for more details:
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# <https://www.gnu.org/licenses/agpl-3.0.html>.
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#
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# Originally licensed under the Apache License, Version 2.0:
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# <http://www.apache.org/licenses/LICENSE-2.0>.
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#
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# [This file includes modifications made by New Vector Limited]
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#
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#
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import itertools
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import logging
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from collections import defaultdict
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from typing import TYPE_CHECKING, Any, Dict, List, Optional, Tuple, Union
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from synapse.api.constants import AccountDataTypes, EduTypes, Membership, PresenceState
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from synapse.api.errors import Codes, StoreError, SynapseError
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from synapse.api.filtering import FilterCollection
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from synapse.api.presence import UserPresenceState
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from synapse.events.utils import (
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SerializeEventConfig,
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format_event_for_client_v2_without_room_id,
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format_event_raw,
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)
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from synapse.handlers.presence import format_user_presence_state
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from synapse.handlers.sync import (
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ArchivedSyncResult,
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InvitedSyncResult,
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JoinedSyncResult,
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KnockedSyncResult,
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SyncConfig,
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SyncResult,
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SyncVersion,
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)
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from synapse.http.server import HttpServer
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from synapse.http.servlet import RestServlet, parse_boolean, parse_integer, parse_string
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from synapse.http.site import SynapseRequest
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from synapse.logging.opentracing import trace_with_opname
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from synapse.types import JsonDict, Requester, StreamToken
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from synapse.util import json_decoder
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from synapse.util.caches.lrucache import LruCache
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from ._base import client_patterns, set_timeline_upper_limit
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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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class SyncRestServlet(RestServlet):
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"""
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GET parameters::
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timeout(int): How long to wait for new events in milliseconds.
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since(batch_token): Batch token when asking for incremental deltas.
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set_presence(str): What state the device presence should be set to.
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default is "online".
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filter(filter_id): A filter to apply to the events returned.
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Response JSON::
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{
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"next_batch": // batch token for the next /sync
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"presence": // presence data for the user.
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"rooms": {
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"join": { // Joined rooms being updated.
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"${room_id}": { // Id of the room being updated
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"event_map": // Map of EventID -> event JSON.
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"timeline": { // The recent events in the room if gap is "true"
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"limited": // Was the per-room event limit exceeded?
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// otherwise the next events in the room.
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"events": [] // list of EventIDs in the "event_map".
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"prev_batch": // back token for getting previous events.
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}
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"state": {"events": []} // list of EventIDs updating the
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// current state to be what it should
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// be at the end of the batch.
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"ephemeral": {"events": []} // list of event objects
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}
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},
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"invite": {}, // Invited rooms being updated.
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"leave": {} // Archived rooms being updated.
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}
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}
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"""
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PATTERNS = client_patterns("/sync$")
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ALLOWED_PRESENCE = {"online", "offline", "unavailable"}
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CATEGORY = "Sync requests"
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def __init__(self, hs: "HomeServer"):
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super().__init__()
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self.hs = hs
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self.auth = hs.get_auth()
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self.store = hs.get_datastores().main
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self.sync_handler = hs.get_sync_handler()
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self.clock = hs.get_clock()
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self.filtering = hs.get_filtering()
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self.presence_handler = hs.get_presence_handler()
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self._server_notices_sender = hs.get_server_notices_sender()
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self._event_serializer = hs.get_event_client_serializer()
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self._msc2654_enabled = hs.config.experimental.msc2654_enabled
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self._msc3773_enabled = hs.config.experimental.msc3773_enabled
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self._json_filter_cache: LruCache[str, bool] = LruCache(
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max_size=1000,
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cache_name="sync_valid_filter",
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)
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async def on_GET(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
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# This will always be set by the time Twisted calls us.
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assert request.args is not None
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if b"from" in request.args:
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# /events used to use 'from', but /sync uses 'since'.
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# Lets be helpful and whine if we see a 'from'.
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raise SynapseError(
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400, "'from' is not a valid query parameter. Did you mean 'since'?"
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)
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requester = await self.auth.get_user_by_req(request, allow_guest=True)
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user = requester.user
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device_id = requester.device_id
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timeout = parse_integer(request, "timeout", default=0)
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since = parse_string(request, "since")
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set_presence = parse_string(
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request,
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"set_presence",
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default="online",
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allowed_values=self.ALLOWED_PRESENCE,
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)
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filter_id = parse_string(request, "filter")
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full_state = parse_boolean(request, "full_state", default=False)
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logger.debug(
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"/sync: user=%r, timeout=%r, since=%r, "
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"set_presence=%r, filter_id=%r, device_id=%r",
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user,
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timeout,
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since,
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set_presence,
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filter_id,
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device_id,
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)
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# Stream position of the last ignored users account data event for this user,
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# if we're initial syncing.
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# We include this in the request key to invalidate an initial sync
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# in the response cache once the set of ignored users has changed.
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# (We filter out ignored users from timeline events, so our sync response
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# is invalid once the set of ignored users changes.)
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last_ignore_accdata_streampos: Optional[int] = None
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if not since:
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# No `since`, so this is an initial sync.
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last_ignore_accdata_streampos = await self.store.get_latest_stream_id_for_global_account_data_by_type_for_user(
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user.to_string(), AccountDataTypes.IGNORED_USER_LIST
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)
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request_key = (
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user,
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timeout,
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since,
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filter_id,
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full_state,
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device_id,
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last_ignore_accdata_streampos,
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)
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if filter_id is None:
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filter_collection = self.filtering.DEFAULT_FILTER_COLLECTION
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elif filter_id.startswith("{"):
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try:
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filter_object = json_decoder.decode(filter_id)
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except Exception:
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raise SynapseError(400, "Invalid filter JSON", errcode=Codes.NOT_JSON)
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# We cache the validation, as this can get quite expensive if people use
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# a literal json blob as a query param.
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if not self._json_filter_cache.get(filter_id):
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self.filtering.check_valid_filter(filter_object)
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self._json_filter_cache[filter_id] = True
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set_timeline_upper_limit(
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filter_object, self.hs.config.server.filter_timeline_limit
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)
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filter_collection = FilterCollection(self.hs, filter_object)
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else:
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try:
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filter_collection = await self.filtering.get_user_filter(
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user, filter_id
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)
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except StoreError as err:
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if err.code != 404:
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raise
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# fix up the description and errcode to be more useful
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raise SynapseError(400, "No such filter", errcode=Codes.INVALID_PARAM)
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sync_config = SyncConfig(
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user=user,
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filter_collection=filter_collection,
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is_guest=requester.is_guest,
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device_id=device_id,
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)
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since_token = None
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if since is not None:
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since_token = await StreamToken.from_string(self.store, since)
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# send any outstanding server notices to the user.
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await self._server_notices_sender.on_user_syncing(user.to_string())
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affect_presence = set_presence != PresenceState.OFFLINE
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context = await self.presence_handler.user_syncing(
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user.to_string(),
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requester.device_id,
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affect_presence=affect_presence,
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presence_state=set_presence,
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)
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with context:
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sync_result = await self.sync_handler.wait_for_sync_for_user(
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requester,
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sync_config,
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SyncVersion.SYNC_V2,
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request_key,
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since_token=since_token,
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timeout=timeout,
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full_state=full_state,
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)
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# the client may have disconnected by now; don't bother to serialize the
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# response if so.
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if request._disconnected:
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logger.info("Client has disconnected; not serializing response.")
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return 200, {}
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time_now = self.clock.time_msec()
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# We know that the the requester has an access token since appservices
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# cannot use sync.
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response_content = await self.encode_response(
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time_now, sync_result, requester, filter_collection
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)
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logger.debug("Event formatting complete")
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return 200, response_content
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@trace_with_opname("sync.encode_response")
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async def encode_response(
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self,
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time_now: int,
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sync_result: SyncResult,
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requester: Requester,
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filter: FilterCollection,
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) -> JsonDict:
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logger.debug("Formatting events in sync response")
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if filter.event_format == "client":
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event_formatter = format_event_for_client_v2_without_room_id
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elif filter.event_format == "federation":
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event_formatter = format_event_raw
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else:
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raise Exception("Unknown event format %s" % (filter.event_format,))
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serialize_options = SerializeEventConfig(
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event_format=event_formatter,
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requester=requester,
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only_event_fields=filter.event_fields,
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)
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stripped_serialize_options = SerializeEventConfig(
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event_format=event_formatter,
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requester=requester,
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include_stripped_room_state=True,
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)
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joined = await self.encode_joined(
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sync_result.joined, time_now, serialize_options
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)
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invited = await self.encode_invited(
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sync_result.invited, time_now, stripped_serialize_options
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)
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knocked = await self.encode_knocked(
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sync_result.knocked, time_now, stripped_serialize_options
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)
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archived = await self.encode_archived(
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sync_result.archived, time_now, serialize_options
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)
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logger.debug("building sync response dict")
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response: JsonDict = defaultdict(dict)
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response["next_batch"] = await sync_result.next_batch.to_string(self.store)
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if sync_result.account_data:
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response["account_data"] = {"events": sync_result.account_data}
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if sync_result.presence:
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response["presence"] = SyncRestServlet.encode_presence(
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sync_result.presence, time_now
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)
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if sync_result.to_device:
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response["to_device"] = {"events": sync_result.to_device}
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if sync_result.device_lists.changed:
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response["device_lists"]["changed"] = list(sync_result.device_lists.changed)
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if sync_result.device_lists.left:
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response["device_lists"]["left"] = list(sync_result.device_lists.left)
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# We always include this because https://github.com/vector-im/element-android/issues/3725
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# The spec isn't terribly clear on when this can be omitted and how a client would tell
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# the difference between "no keys present" and "nothing changed" in terms of whole field
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# absent / individual key type entry absent
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# Corresponding synapse issue: https://github.com/matrix-org/synapse/issues/10456
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response["device_one_time_keys_count"] = sync_result.device_one_time_keys_count
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# https://github.com/matrix-org/matrix-doc/blob/54255851f642f84a4f1aaf7bc063eebe3d76752b/proposals/2732-olm-fallback-keys.md
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# states that this field should always be included, as long as the server supports the feature.
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response["org.matrix.msc2732.device_unused_fallback_key_types"] = (
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sync_result.device_unused_fallback_key_types
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)
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response["device_unused_fallback_key_types"] = (
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sync_result.device_unused_fallback_key_types
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)
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if joined:
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response["rooms"][Membership.JOIN] = joined
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if invited:
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response["rooms"][Membership.INVITE] = invited
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if knocked:
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response["rooms"][Membership.KNOCK] = knocked
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if archived:
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response["rooms"][Membership.LEAVE] = archived
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return response
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@staticmethod
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def encode_presence(events: List[UserPresenceState], time_now: int) -> JsonDict:
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return {
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"events": [
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{
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"type": EduTypes.PRESENCE,
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"sender": event.user_id,
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"content": format_user_presence_state(
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event, time_now, include_user_id=False
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),
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}
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for event in events
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]
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}
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@trace_with_opname("sync.encode_joined")
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async def encode_joined(
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self,
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rooms: List[JoinedSyncResult],
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time_now: int,
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serialize_options: SerializeEventConfig,
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) -> JsonDict:
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"""
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Encode the joined rooms in a sync result
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Args:
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rooms: list of sync results for rooms this user is joined to
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time_now: current time - used as a baseline for age calculations
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serialize_options: Event serializer options
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Returns:
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The joined rooms list, in our response format
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"""
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joined = {}
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for room in rooms:
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joined[room.room_id] = await self.encode_room(
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room, time_now, joined=True, serialize_options=serialize_options
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)
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return joined
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@trace_with_opname("sync.encode_invited")
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async def encode_invited(
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self,
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rooms: List[InvitedSyncResult],
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time_now: int,
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serialize_options: SerializeEventConfig,
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) -> JsonDict:
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"""
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Encode the invited rooms in a sync result
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Args:
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rooms: list of sync results for rooms this user is invited to
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time_now: current time - used as a baseline for age calculations
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serialize_options: Event serializer options
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Returns:
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The invited rooms list, in our response format
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"""
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invited = {}
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for room in rooms:
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invite = await self._event_serializer.serialize_event(
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room.invite, time_now, config=serialize_options
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)
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unsigned = dict(invite.get("unsigned", {}))
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invite["unsigned"] = unsigned
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invited_state = list(unsigned.pop("invite_room_state", []))
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invited_state.append(invite)
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invited[room.room_id] = {"invite_state": {"events": invited_state}}
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return invited
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@trace_with_opname("sync.encode_knocked")
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async def encode_knocked(
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self,
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rooms: List[KnockedSyncResult],
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time_now: int,
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serialize_options: SerializeEventConfig,
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) -> Dict[str, Dict[str, Any]]:
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"""
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Encode the rooms we've knocked on in a sync result.
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Args:
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rooms: list of sync results for rooms this user is knocking on
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time_now: current time - used as a baseline for age calculations
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serialize_options: Event serializer options
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Returns:
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The list of rooms the user has knocked on, in our response format.
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"""
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knocked = {}
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for room in rooms:
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knock = await self._event_serializer.serialize_event(
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room.knock, time_now, config=serialize_options
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)
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# Extract the `unsigned` key from the knock event.
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# This is where we (cheekily) store the knock state events
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unsigned = knock.setdefault("unsigned", {})
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# Duplicate the dictionary in order to avoid modifying the original
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unsigned = dict(unsigned)
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# Extract the stripped room state from the unsigned dict
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# This is for clients to get a little bit of information about
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# the room they've knocked on, without revealing any sensitive information
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knocked_state = list(unsigned.pop("knock_room_state", []))
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# Append the actual knock membership event itself as well. This provides
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# the client with:
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#
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# * A knock state event that they can use for easier internal tracking
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# * The rough timestamp of when the knock occurred contained within the event
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knocked_state.append(knock)
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# Build the `knock_state` dictionary, which will contain the state of the
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# room that the client has knocked on
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knocked[room.room_id] = {"knock_state": {"events": knocked_state}}
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return knocked
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|
|
@trace_with_opname("sync.encode_archived")
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|
async def encode_archived(
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self,
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rooms: List[ArchivedSyncResult],
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time_now: int,
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serialize_options: SerializeEventConfig,
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) -> JsonDict:
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"""
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Encode the archived rooms in a sync result
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Args:
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rooms: list of sync results for rooms this user is joined to
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time_now: current time - used as a baseline for age calculations
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serialize_options: Event serializer options
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Returns:
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The archived rooms list, in our response format
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"""
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joined = {}
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for room in rooms:
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joined[room.room_id] = await self.encode_room(
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room, time_now, joined=False, serialize_options=serialize_options
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)
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return joined
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async def encode_room(
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self,
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room: Union[JoinedSyncResult, ArchivedSyncResult],
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|
time_now: int,
|
|
joined: bool,
|
|
serialize_options: SerializeEventConfig,
|
|
) -> JsonDict:
|
|
"""
|
|
Args:
|
|
room: sync result for a single room
|
|
time_now: current time - used as a baseline for age calculations
|
|
token_id: ID of the user's auth token - used for namespacing
|
|
of transaction IDs
|
|
joined: True if the user is joined to this room - will mean
|
|
we handle ephemeral events
|
|
only_fields: Optional. The list of event fields to include.
|
|
event_formatter: function to convert from federation format
|
|
to client format
|
|
Returns:
|
|
The room, encoded in our response format
|
|
"""
|
|
state_dict = room.state
|
|
timeline_events = room.timeline.events
|
|
|
|
state_events = state_dict.values()
|
|
|
|
for event in itertools.chain(state_events, timeline_events):
|
|
# We've had bug reports that events were coming down under the
|
|
# wrong room.
|
|
if event.room_id != room.room_id:
|
|
logger.warning(
|
|
"Event %r is under room %r instead of %r",
|
|
event.event_id,
|
|
room.room_id,
|
|
event.room_id,
|
|
)
|
|
|
|
serialized_state = await self._event_serializer.serialize_events(
|
|
state_events, time_now, config=serialize_options
|
|
)
|
|
serialized_timeline = await self._event_serializer.serialize_events(
|
|
timeline_events,
|
|
time_now,
|
|
config=serialize_options,
|
|
bundle_aggregations=room.timeline.bundled_aggregations,
|
|
)
|
|
|
|
account_data = room.account_data
|
|
|
|
result: JsonDict = {
|
|
"timeline": {
|
|
"events": serialized_timeline,
|
|
"prev_batch": await room.timeline.prev_batch.to_string(self.store),
|
|
"limited": room.timeline.limited,
|
|
},
|
|
"state": {"events": serialized_state},
|
|
"account_data": {"events": account_data},
|
|
}
|
|
|
|
if joined:
|
|
assert isinstance(room, JoinedSyncResult)
|
|
ephemeral_events = room.ephemeral
|
|
result["ephemeral"] = {"events": ephemeral_events}
|
|
result["unread_notifications"] = room.unread_notifications
|
|
if room.unread_thread_notifications:
|
|
result["unread_thread_notifications"] = room.unread_thread_notifications
|
|
if self._msc3773_enabled:
|
|
result["org.matrix.msc3773.unread_thread_notifications"] = (
|
|
room.unread_thread_notifications
|
|
)
|
|
result["summary"] = room.summary
|
|
if self._msc2654_enabled:
|
|
result["org.matrix.msc2654.unread_count"] = room.unread_count
|
|
|
|
return result
|
|
|
|
|
|
class SlidingSyncE2eeRestServlet(RestServlet):
|
|
"""
|
|
API endpoint for MSC3575 Sliding Sync `/sync/e2ee`. This is being introduced as part
|
|
of Sliding Sync but doesn't have any sliding window component. It's just a way to
|
|
get E2EE events without having to sit through a big initial sync (`/sync` v2). And
|
|
we can avoid encryption events being backed up by the main sync response.
|
|
|
|
Having To-Device messages split out to this sync endpoint also helps when clients
|
|
need to have 2 or more sync streams open at a time, e.g a push notification process
|
|
and a main process. This can cause the two processes to race to fetch the To-Device
|
|
events, resulting in the need for complex synchronisation rules to ensure the token
|
|
is correctly and atomically exchanged between processes.
|
|
|
|
GET parameters::
|
|
timeout(int): How long to wait for new events in milliseconds.
|
|
since(batch_token): Batch token when asking for incremental deltas.
|
|
|
|
Response JSON::
|
|
{
|
|
"next_batch": // batch token for the next /sync
|
|
"to_device": {
|
|
// list of to-device events
|
|
"events": [
|
|
{
|
|
"content: { "algorithm": "m.olm.v1.curve25519-aes-sha2", "ciphertext": { ... }, "org.matrix.msgid": "abcd", "session_id": "abcd" },
|
|
"type": "m.room.encrypted",
|
|
"sender": "@alice:example.com",
|
|
}
|
|
// ...
|
|
]
|
|
},
|
|
"device_lists": {
|
|
"changed": ["@alice:example.com"],
|
|
"left": ["@bob:example.com"]
|
|
},
|
|
"device_one_time_keys_count": {
|
|
"signed_curve25519": 50
|
|
},
|
|
"device_unused_fallback_key_types": [
|
|
"signed_curve25519"
|
|
]
|
|
}
|
|
"""
|
|
|
|
PATTERNS = client_patterns(
|
|
"/org.matrix.msc3575/sync/e2ee$", releases=[], v1=False, unstable=True
|
|
)
|
|
|
|
def __init__(self, hs: "HomeServer"):
|
|
super().__init__()
|
|
self.hs = hs
|
|
self.auth = hs.get_auth()
|
|
self.store = hs.get_datastores().main
|
|
self.sync_handler = hs.get_sync_handler()
|
|
|
|
# Filtering only matters for the `device_lists` because it requires a bunch of
|
|
# derived information from rooms (see how `_generate_sync_entry_for_rooms()`
|
|
# prepares a bunch of data for `_generate_sync_entry_for_device_list()`).
|
|
self.only_member_events_filter_collection = FilterCollection(
|
|
self.hs,
|
|
{
|
|
"room": {
|
|
# We only care about membership events for the `device_lists`.
|
|
# Membership will tell us whether a user has joined/left a room and
|
|
# if there are new devices to encrypt for.
|
|
"timeline": {
|
|
"types": ["m.room.member"],
|
|
},
|
|
"state": {
|
|
"types": ["m.room.member"],
|
|
},
|
|
# We don't want any extra account_data generated because it's not
|
|
# returned by this endpoint. This helps us avoid work in
|
|
# `_generate_sync_entry_for_rooms()`
|
|
"account_data": {
|
|
"not_types": ["*"],
|
|
},
|
|
# We don't want any extra ephemeral data generated because it's not
|
|
# returned by this endpoint. This helps us avoid work in
|
|
# `_generate_sync_entry_for_rooms()`
|
|
"ephemeral": {
|
|
"not_types": ["*"],
|
|
},
|
|
},
|
|
# We don't want any extra account_data generated because it's not
|
|
# returned by this endpoint. (This is just here for good measure)
|
|
"account_data": {
|
|
"not_types": ["*"],
|
|
},
|
|
# We don't want any extra presence data generated because it's not
|
|
# returned by this endpoint. (This is just here for good measure)
|
|
"presence": {
|
|
"not_types": ["*"],
|
|
},
|
|
},
|
|
)
|
|
|
|
async def on_GET(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
|
|
requester = await self.auth.get_user_by_req(request, allow_guest=True)
|
|
user = requester.user
|
|
device_id = requester.device_id
|
|
|
|
timeout = parse_integer(request, "timeout", default=0)
|
|
since = parse_string(request, "since")
|
|
|
|
sync_config = SyncConfig(
|
|
user=user,
|
|
filter_collection=self.only_member_events_filter_collection,
|
|
is_guest=requester.is_guest,
|
|
device_id=device_id,
|
|
)
|
|
|
|
since_token = None
|
|
if since is not None:
|
|
since_token = await StreamToken.from_string(self.store, since)
|
|
|
|
# Request cache key
|
|
request_key = (
|
|
SyncVersion.E2EE_SYNC,
|
|
user,
|
|
timeout,
|
|
since,
|
|
)
|
|
|
|
# Gather data for the response
|
|
sync_result = await self.sync_handler.wait_for_sync_for_user(
|
|
requester,
|
|
sync_config,
|
|
SyncVersion.E2EE_SYNC,
|
|
request_key,
|
|
since_token=since_token,
|
|
timeout=timeout,
|
|
full_state=False,
|
|
)
|
|
|
|
# The client may have disconnected by now; don't bother to serialize the
|
|
# response if so.
|
|
if request._disconnected:
|
|
logger.info("Client has disconnected; not serializing response.")
|
|
return 200, {}
|
|
|
|
response: JsonDict = defaultdict(dict)
|
|
response["next_batch"] = await sync_result.next_batch.to_string(self.store)
|
|
|
|
if sync_result.to_device:
|
|
response["to_device"] = {"events": sync_result.to_device}
|
|
|
|
if sync_result.device_lists.changed:
|
|
response["device_lists"]["changed"] = list(sync_result.device_lists.changed)
|
|
if sync_result.device_lists.left:
|
|
response["device_lists"]["left"] = list(sync_result.device_lists.left)
|
|
|
|
# We always include this because https://github.com/vector-im/element-android/issues/3725
|
|
# The spec isn't terribly clear on when this can be omitted and how a client would tell
|
|
# the difference between "no keys present" and "nothing changed" in terms of whole field
|
|
# absent / individual key type entry absent
|
|
# Corresponding synapse issue: https://github.com/matrix-org/synapse/issues/10456
|
|
response["device_one_time_keys_count"] = sync_result.device_one_time_keys_count
|
|
|
|
# https://github.com/matrix-org/matrix-doc/blob/54255851f642f84a4f1aaf7bc063eebe3d76752b/proposals/2732-olm-fallback-keys.md
|
|
# states that this field should always be included, as long as the server supports the feature.
|
|
response["device_unused_fallback_key_types"] = (
|
|
sync_result.device_unused_fallback_key_types
|
|
)
|
|
|
|
return 200, response
|
|
|
|
|
|
def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
|
|
SyncRestServlet(hs).register(http_server)
|
|
|
|
if hs.config.experimental.msc3575_enabled:
|
|
SlidingSyncE2eeRestServlet(hs).register(http_server)
|