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https://mau.dev/maunium/synapse.git
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![Erik Johnston](/assets/img/avatar_default.png)
If a client didn't specify a from token when paginating backwards synapse would attempt to query the (global) maximum topological token. This a) doesn't make much sense since they're room specific and b) there are no indices that lets postgres do this efficiently.
610 lines
21 KiB
Python
610 lines
21 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 - 2016 OpenMarket Ltd
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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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from twisted.internet import defer
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from synapse.api.constants import EventTypes, Membership
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from synapse.api.errors import AuthError, Codes, SynapseError, LimitExceededError
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from synapse.crypto.event_signing import add_hashes_and_signatures
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from synapse.events.utils import serialize_event
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from synapse.events.validator import EventValidator
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from synapse.push.action_generator import ActionGenerator
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from synapse.types import (
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UserID, RoomAlias, RoomStreamToken, get_domain_from_id
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)
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from synapse.util.async import run_on_reactor, ReadWriteLock
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from synapse.util.logcontext import preserve_fn
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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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from canonicaljson import encode_canonical_json
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import logging
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logger = logging.getLogger(__name__)
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class MessageHandler(BaseHandler):
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def __init__(self, hs):
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super(MessageHandler, self).__init__(hs)
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self.hs = hs
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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.pagination_lock = ReadWriteLock()
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@defer.inlineCallbacks
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def purge_history(self, room_id, event_id):
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event = yield self.store.get_event(event_id)
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if event.room_id != room_id:
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raise SynapseError(400, "Event is for wrong room.")
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depth = event.depth
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with (yield self.pagination_lock.write(room_id)):
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yield self.store.delete_old_state(room_id, depth)
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@defer.inlineCallbacks
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def get_messages(self, requester, room_id=None, pagin_config=None,
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as_client_event=True, event_filter=None):
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"""Get messages in a room.
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Args:
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requester (Requester): The user requesting messages.
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room_id (str): The room they want messages from.
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pagin_config (synapse.api.streams.PaginationConfig): The pagination
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config rules to apply, if any.
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as_client_event (bool): True to get events in client-server format.
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event_filter (Filter): Filter to apply to results or None
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Returns:
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dict: Pagination API results
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"""
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user_id = requester.user.to_string()
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if pagin_config.from_token:
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room_token = pagin_config.from_token.room_key
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else:
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pagin_config.from_token = (
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yield self.hs.get_event_sources().get_current_token_for_room(
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room_id=room_id
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)
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)
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room_token = pagin_config.from_token.room_key
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room_token = RoomStreamToken.parse(room_token)
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pagin_config.from_token = pagin_config.from_token.copy_and_replace(
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"room_key", str(room_token)
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)
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source_config = pagin_config.get_source_config("room")
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with (yield self.pagination_lock.read(room_id)):
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membership, member_event_id = yield self._check_in_room_or_world_readable(
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room_id, user_id
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)
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if source_config.direction == 'b':
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# if we're going backwards, we might need to backfill. This
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# requires that we have a topo token.
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if room_token.topological:
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max_topo = room_token.topological
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else:
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max_topo = yield self.store.get_max_topological_token(
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room_id, room_token.stream
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)
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if membership == Membership.LEAVE:
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# If they have left the room then clamp the token to be before
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# they left the room, to save the effort of loading from the
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# database.
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leave_token = yield self.store.get_topological_token_for_event(
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member_event_id
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)
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leave_token = RoomStreamToken.parse(leave_token)
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if leave_token.topological < max_topo:
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source_config.from_key = str(leave_token)
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yield self.hs.get_handlers().federation_handler.maybe_backfill(
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room_id, max_topo
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)
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events, next_key = yield self.store.paginate_room_events(
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room_id=room_id,
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from_key=source_config.from_key,
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to_key=source_config.to_key,
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direction=source_config.direction,
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limit=source_config.limit,
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event_filter=event_filter,
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)
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next_token = pagin_config.from_token.copy_and_replace(
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"room_key", next_key
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)
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if not events:
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defer.returnValue({
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"chunk": [],
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"start": pagin_config.from_token.to_string(),
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"end": next_token.to_string(),
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})
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if event_filter:
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events = event_filter.filter(events)
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events = yield filter_events_for_client(
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self.store,
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user_id,
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events,
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is_peeking=(member_event_id is None),
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)
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time_now = self.clock.time_msec()
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chunk = {
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"chunk": [
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serialize_event(e, time_now, as_client_event)
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for e in events
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],
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"start": pagin_config.from_token.to_string(),
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"end": next_token.to_string(),
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}
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defer.returnValue(chunk)
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@defer.inlineCallbacks
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def create_event(self, event_dict, token_id=None, txn_id=None, prev_event_ids=None):
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"""
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Given a dict from a client, create a new event.
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Creates an FrozenEvent object, filling out auth_events, prev_events,
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etc.
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Adds display names to Join membership events.
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Args:
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event_dict (dict): An entire event
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token_id (str)
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txn_id (str)
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prev_event_ids (list): The prev event ids to use when creating the event
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Returns:
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Tuple of created event (FrozenEvent), Context
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"""
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builder = self.event_builder_factory.new(event_dict)
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self.validator.validate_new(builder)
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if builder.type == EventTypes.Member:
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membership = builder.content.get("membership", None)
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target = UserID.from_string(builder.state_key)
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if membership in {Membership.JOIN, Membership.INVITE}:
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# If event doesn't include a display name, add one.
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profile = self.hs.get_handlers().profile_handler
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content = builder.content
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try:
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content["displayname"] = yield profile.get_displayname(target)
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content["avatar_url"] = yield profile.get_avatar_url(target)
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except Exception as e:
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logger.info(
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"Failed to get profile information for %r: %s",
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target, e
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)
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if token_id is not None:
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builder.internal_metadata.token_id = token_id
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if txn_id is not None:
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builder.internal_metadata.txn_id = txn_id
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event, context = yield self._create_new_client_event(
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builder=builder,
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prev_event_ids=prev_event_ids,
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)
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defer.returnValue((event, context))
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@defer.inlineCallbacks
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def send_nonmember_event(self, requester, event, context, ratelimit=True):
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"""
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Persists and notifies local clients and federation of an event.
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Args:
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event (FrozenEvent) the event to send.
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context (Context) the context of the event.
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ratelimit (bool): Whether to rate limit this send.
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is_guest (bool): Whether the sender is a guest.
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"""
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if event.type == EventTypes.Member:
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raise SynapseError(
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500,
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"Tried to send member event through non-member codepath"
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)
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# We check here if we are currently being rate limited, so that we
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# don't do unnecessary work. We check again just before we actually
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# send the event.
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time_now = self.clock.time()
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allowed, time_allowed = self.ratelimiter.send_message(
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event.sender, time_now,
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msg_rate_hz=self.hs.config.rc_messages_per_second,
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burst_count=self.hs.config.rc_message_burst_count,
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update=False,
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)
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if not allowed:
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raise LimitExceededError(
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retry_after_ms=int(1000 * (time_allowed - time_now)),
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)
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user = UserID.from_string(event.sender)
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assert self.hs.is_mine(user), "User must be our own: %s" % (user,)
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if event.is_state():
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prev_state = yield self.deduplicate_state_event(event, context)
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if prev_state is not None:
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defer.returnValue(prev_state)
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yield self.handle_new_client_event(
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requester=requester,
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event=event,
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context=context,
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ratelimit=ratelimit,
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)
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if event.type == EventTypes.Message:
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presence = self.hs.get_presence_handler()
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yield presence.bump_presence_active_time(user)
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@defer.inlineCallbacks
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def deduplicate_state_event(self, event, context):
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"""
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Checks whether event is in the latest resolved state in context.
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If so, returns the version of the event in context.
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Otherwise, returns None.
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"""
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prev_event_id = context.prev_state_ids.get((event.type, event.state_key))
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prev_event = yield self.store.get_event(prev_event_id, allow_none=True)
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if not prev_event:
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return
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if prev_event and event.user_id == prev_event.user_id:
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prev_content = encode_canonical_json(prev_event.content)
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next_content = encode_canonical_json(event.content)
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if prev_content == next_content:
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defer.returnValue(prev_event)
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return
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@defer.inlineCallbacks
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def create_and_send_nonmember_event(
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self,
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requester,
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event_dict,
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ratelimit=True,
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txn_id=None
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):
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"""
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Creates an event, then sends it.
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See self.create_event and self.send_nonmember_event.
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"""
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event, context = yield self.create_event(
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event_dict,
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token_id=requester.access_token_id,
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txn_id=txn_id
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)
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yield self.send_nonmember_event(
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requester,
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event,
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context,
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ratelimit=ratelimit,
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)
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defer.returnValue(event)
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@defer.inlineCallbacks
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def get_room_data(self, user_id=None, room_id=None,
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event_type=None, state_key="", is_guest=False):
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""" Get data from a room.
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Args:
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event : The room path event
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Returns:
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The path data content.
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Raises:
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SynapseError if something went wrong.
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"""
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membership, membership_event_id = yield self._check_in_room_or_world_readable(
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room_id, user_id
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)
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if membership == Membership.JOIN:
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data = yield self.state_handler.get_current_state(
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room_id, event_type, state_key
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)
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elif membership == Membership.LEAVE:
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key = (event_type, state_key)
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room_state = yield self.store.get_state_for_events(
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[membership_event_id], [key]
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)
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data = room_state[membership_event_id].get(key)
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defer.returnValue(data)
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@defer.inlineCallbacks
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def _check_in_room_or_world_readable(self, room_id, user_id):
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try:
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# check_user_was_in_room will return the most recent membership
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# event for the user if:
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# * The user is a non-guest user, and was ever in the room
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# * The user is a guest user, and has joined the room
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# else it will throw.
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member_event = yield self.auth.check_user_was_in_room(room_id, user_id)
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defer.returnValue((member_event.membership, member_event.event_id))
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return
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except AuthError:
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visibility = yield self.state_handler.get_current_state(
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room_id, EventTypes.RoomHistoryVisibility, ""
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)
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if (
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visibility and
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visibility.content["history_visibility"] == "world_readable"
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):
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defer.returnValue((Membership.JOIN, None))
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return
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raise AuthError(
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403, "Guest access not allowed", errcode=Codes.GUEST_ACCESS_FORBIDDEN
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)
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@defer.inlineCallbacks
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def get_state_events(self, user_id, room_id, is_guest=False):
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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.
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Args:
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user_id(str): The user requesting state events.
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room_id(str): The room ID to get all state events from.
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Returns:
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A list of dicts representing state events. [{}, {}, {}]
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"""
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membership, membership_event_id = yield self._check_in_room_or_world_readable(
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room_id, user_id
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)
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if membership == Membership.JOIN:
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room_state = yield self.state_handler.get_current_state(room_id)
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elif membership == Membership.LEAVE:
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room_state = yield self.store.get_state_for_events(
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[membership_event_id], None
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)
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room_state = room_state[membership_event_id]
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now = self.clock.time_msec()
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defer.returnValue(
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[serialize_event(c, now) for c in room_state.values()]
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)
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@measure_func("_create_new_client_event")
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@defer.inlineCallbacks
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def _create_new_client_event(self, builder, prev_event_ids=None):
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if prev_event_ids:
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prev_events = yield self.store.add_event_hashes(prev_event_ids)
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prev_max_depth = yield self.store.get_max_depth_of_events(prev_event_ids)
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depth = prev_max_depth + 1
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else:
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latest_ret = yield self.store.get_latest_event_ids_and_hashes_in_room(
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builder.room_id,
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)
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if latest_ret:
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depth = max([d for _, _, d in latest_ret]) + 1
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else:
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depth = 1
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prev_events = [
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(event_id, prev_hashes)
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for event_id, prev_hashes, _ in latest_ret
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]
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builder.prev_events = prev_events
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builder.depth = depth
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state_handler = self.state_handler
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context = yield state_handler.compute_event_context(builder)
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if builder.is_state():
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builder.prev_state = yield self.store.add_event_hashes(
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context.prev_state_events
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)
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yield self.auth.add_auth_events(builder, context)
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signing_key = self.hs.config.signing_key[0]
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add_hashes_and_signatures(
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builder, self.server_name, signing_key
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)
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event = builder.build()
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logger.debug(
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"Created event %s with state: %s",
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event.event_id, context.prev_state_ids,
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)
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defer.returnValue(
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(event, context,)
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)
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@measure_func("handle_new_client_event")
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@defer.inlineCallbacks
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def handle_new_client_event(
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self,
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requester,
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event,
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context,
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ratelimit=True,
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extra_users=[]
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):
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# We now need to go and hit out to wherever we need to hit out to.
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if ratelimit:
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self.ratelimit(requester)
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try:
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yield self.auth.check_from_context(event, context)
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except AuthError as err:
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logger.warn("Denying new event %r because %s", event, err)
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raise err
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yield self.maybe_kick_guest_users(event, context)
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if event.type == EventTypes.CanonicalAlias:
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# Check the alias is acually valid (at this time at least)
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room_alias_str = event.content.get("alias", None)
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if room_alias_str:
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room_alias = RoomAlias.from_string(room_alias_str)
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directory_handler = self.hs.get_handlers().directory_handler
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mapping = yield directory_handler.get_association(room_alias)
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if mapping["room_id"] != event.room_id:
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raise SynapseError(
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400,
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"Room alias %s does not point to the room" % (
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room_alias_str,
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)
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)
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federation_handler = self.hs.get_handlers().federation_handler
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if event.type == EventTypes.Member:
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if event.content["membership"] == Membership.INVITE:
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def is_inviter_member_event(e):
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return (
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e.type == EventTypes.Member and
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e.sender == event.sender
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)
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state_to_include_ids = [
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e_id
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for k, e_id in context.current_state_ids.items()
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if k[0] in self.hs.config.room_invite_state_types
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or k[0] == EventTypes.Member and k[1] == event.sender
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]
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state_to_include = yield self.store.get_events(state_to_include_ids)
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event.unsigned["invite_room_state"] = [
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{
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"type": e.type,
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|
"state_key": e.state_key,
|
|
"content": e.content,
|
|
"sender": e.sender,
|
|
}
|
|
for e in state_to_include.values()
|
|
]
|
|
|
|
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 = yield 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.type == EventTypes.Redaction:
|
|
auth_events_ids = yield self.auth.compute_auth_events(
|
|
event, context.prev_state_ids, for_verification=True,
|
|
)
|
|
auth_events = yield self.store.get_events(auth_events_ids)
|
|
auth_events = {
|
|
(e.type, e.state_key): e for e in auth_events.values()
|
|
}
|
|
if self.auth.check_redaction(event, auth_events=auth_events):
|
|
original_event = yield self.store.get_event(
|
|
event.redacts,
|
|
check_redacted=False,
|
|
get_prev_content=False,
|
|
allow_rejected=False,
|
|
allow_none=False
|
|
)
|
|
if event.user_id != original_event.user_id:
|
|
raise AuthError(
|
|
403,
|
|
"You don't have permission to redact events"
|
|
)
|
|
|
|
if event.type == EventTypes.Create and context.prev_state_ids:
|
|
raise AuthError(
|
|
403,
|
|
"Changing the room create event is forbidden",
|
|
)
|
|
|
|
action_generator = ActionGenerator(self.hs)
|
|
yield action_generator.handle_push_actions_for_event(
|
|
event, context
|
|
)
|
|
|
|
(event_stream_id, max_stream_id) = yield self.store.persist_event(
|
|
event, context=context
|
|
)
|
|
|
|
# this intentionally does not yield: we don't care about the result
|
|
# and don't need to wait for it.
|
|
preserve_fn(self.hs.get_pusherpool().on_new_notifications)(
|
|
event_stream_id, max_stream_id
|
|
)
|
|
|
|
users_in_room = yield self.store.get_joined_users_from_context(event, context)
|
|
|
|
destinations = [
|
|
get_domain_from_id(user_id) for user_id in users_in_room
|
|
if not self.hs.is_mine_id(user_id)
|
|
]
|
|
|
|
@defer.inlineCallbacks
|
|
def _notify():
|
|
yield run_on_reactor()
|
|
yield self.notifier.on_new_room_event(
|
|
event, event_stream_id, max_stream_id,
|
|
extra_users=extra_users
|
|
)
|
|
|
|
preserve_fn(_notify)()
|
|
|
|
# If invite, remove room_state from unsigned before sending.
|
|
event.unsigned.pop("invite_room_state", None)
|
|
|
|
preserve_fn(federation_handler.handle_new_event)(
|
|
event, destinations=destinations,
|
|
)
|