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https://git.anonymousland.org/anonymousland/synapse.git
synced 2024-09-09 13:41:55 +00:00
Allow room initialSync for users that have left the room, returning a snapshot of how the room was when they left it
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dd42bb78d0
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@ -104,6 +104,20 @@ class Auth(object):
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@defer.inlineCallbacks
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def check_joined_room(self, room_id, user_id, current_state=None):
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"""Check if the user is currently joined in the room
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Args:
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room_id(str): The room to check.
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user_id(str): The user to check.
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current_state(dict): Optional map of the current state of the room.
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If provided then that map is used to check whether they are a
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member of the room. Otherwise the current membership is
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loaded from the database.
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Raises:
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AuthError if the user is not in the room.
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Returns:
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A deferred membership event for the user if the user is in
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the room.
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"""
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if current_state:
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member = current_state.get(
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(EventTypes.Member, user_id),
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@ -119,6 +133,41 @@ class Auth(object):
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self._check_joined_room(member, user_id, room_id)
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defer.returnValue(member)
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@defer.inlineCallbacks
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def check_user_was_in_room(self, room_id, user_id, current_state=None):
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"""Check if the user was in the room at some point.
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Args:
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room_id(str): The room to check.
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user_id(str): The user to check.
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current_state(dict): Optional map of the current state of the room.
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If provided then that map is used to check whether they are a
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member of the room. Otherwise the current membership is
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loaded from the database.
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Raises:
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AuthError if the user was never in the room.
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Returns:
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A deferred membership event for the user if the user was in
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the room.
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"""
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if current_state:
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member = current_state.get(
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(EventTypes.Member, user_id),
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None
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)
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else:
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member = yield self.state.get_current_state(
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room_id=room_id,
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event_type=EventTypes.Member,
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state_key=user_id
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)
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if not member:
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raise AuthError(403, "User %s not in room %s" % (
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user_id, room_id
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))
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defer.returnValue(member)
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@defer.inlineCallbacks
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def check_host_in_room(self, room_id, host):
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curr_state = yield self.state.get_current_state(room_id)
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@ -22,7 +22,7 @@ from synapse.events.utils import serialize_event
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from synapse.events.validator import EventValidator
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from synapse.util import unwrapFirstError
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from synapse.util.logcontext import PreserveLoggingContext
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from synapse.types import UserID, RoomStreamToken
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from synapse.types import UserID, RoomStreamToken, StreamToken
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from ._base import BaseHandler
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@ -377,7 +377,6 @@ class MessageHandler(BaseHandler):
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lambda states: states[event.event_id]
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)
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(messages, token), current_state = yield defer.gatherResults(
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[
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self.store.get_recent_events_for_room(
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@ -434,13 +433,83 @@ class MessageHandler(BaseHandler):
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@defer.inlineCallbacks
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def room_initial_sync(self, user_id, room_id, pagin_config=None,
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feedback=False):
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current_state = yield self.state.get_current_state(
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room_id=room_id,
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"""Capture the a snapshot of a room. If user is currently a member of
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the room this will be what is currently in the room. If the user left
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the room this will be what was in the room when they left.
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Args:
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user_id(str): The user to get a snapshot for.
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room_id(str): The room to get a snapshot of.
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pagin_config(synapse.api.streams.PaginationConfig): The pagination
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config used to determine how many messages to return.
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Raises:
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AuthError if the user wasn't in the room.
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Returns:
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A JSON object with the snapshot of the room.
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"""
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member_event = yield self.auth.check_user_was_in_room(room_id, user_id)
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if member_event.membership == Membership.JOIN:
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result = yield self._room_initial_sync_joined(
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user_id, room_id, pagin_config, member_event
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)
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elif member_event.membership == Membership.LEAVE:
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result = yield self._room_initial_sync_parted(
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user_id, room_id, pagin_config, member_event
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)
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defer.returnValue(result)
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@defer.inlineCallbacks
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def _room_initial_sync_parted(self, user_id, room_id, pagin_config,
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member_event):
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room_state = yield self.store.get_state_for_events(
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member_event.room_id, [member_event.event_id], None
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)
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yield self.auth.check_joined_room(
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room_id, user_id,
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current_state=current_state
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room_state = room_state[member_event.event_id]
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limit = pagin_config.limit if pagin_config else None
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if limit is None:
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limit = 10
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stream_token = yield self.store.get_stream_token_for_event(
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member_event.event_id
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)
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messages, token = yield self.store.get_recent_events_for_room(
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room_id,
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limit=limit,
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end_token=stream_token
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)
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messages = yield self._filter_events_for_client(
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user_id, room_id, messages
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)
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start_token = StreamToken(token[0], 0, 0, 0)
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end_token = StreamToken(token[1], 0, 0, 0)
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time_now = self.clock.time_msec()
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defer.returnValue({
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"membership": member_event.membership,
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"room_id": room_id,
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"messages": {
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"chunk": [serialize_event(m, time_now) for m in messages],
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"start": start_token.to_string(),
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"end": end_token.to_string(),
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},
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"state": [serialize_event(s, time_now) for s in room_state.values()],
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"presence": [],
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"receipts": [],
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})
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@defer.inlineCallbacks
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def _room_initial_sync_joined(self, user_id, room_id, pagin_config,
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member_event):
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current_state = yield self.state.get_current_state(
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room_id=room_id,
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)
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# TODO(paul): I wish I was called with user objects not user_id
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@ -454,8 +523,6 @@ class MessageHandler(BaseHandler):
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for x in current_state.values()
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]
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member_event = current_state.get((EventTypes.Member, user_id,))
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now_token = yield self.hs.get_event_sources().get_current_token()
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limit = pagin_config.limit if pagin_config else None
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@ -379,6 +379,21 @@ class StreamStore(SQLBaseStore):
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)
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defer.returnValue("t%d-%d" % (topo, token))
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def get_stream_token_for_event(self, event_id):
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"""The stream token for an event
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Args:
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event_id(str): The id of the event to look up a stream token for.
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Raises:
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StoreError if the event wasn't in the database.
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Returns:
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A deferred "s%d" stream token.
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"""
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return self._simple_select_one_onecol(
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table="events",
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keyvalues={"event_id": event_id},
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retcol="stream_ordering",
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).addCallback(lambda stream_ordering: "s%d" % (stream_ordering,))
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def _get_max_topological_txn(self, txn):
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txn.execute(
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"SELECT MAX(topological_ordering) FROM events"
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