diff options
Diffstat (limited to 'synapse/handlers/_base.py')
| -rw-r--r-- | synapse/handlers/_base.py | 80 |
1 files changed, 67 insertions, 13 deletions
diff --git a/synapse/handlers/_base.py b/synapse/handlers/_base.py index bdade98bf7..90eabb6eb7 100644 --- a/synapse/handlers/_base.py +++ b/synapse/handlers/_base.py @@ -29,6 +29,14 @@ import logging logger = logging.getLogger(__name__) +VISIBILITY_PRIORITY = ( + "world_readable", + "shared", + "invited", + "joined", +) + + class BaseHandler(object): """ Common base class for the event handlers. @@ -85,10 +93,28 @@ class BaseHandler(object): else: visibility = "shared" + if visibility not in VISIBILITY_PRIORITY: + visibility = "shared" + # if it was world_readable, it's easy: everyone can read it if visibility == "world_readable": return True + # Always allow history visibility events on boundaries. This is done + # by setting the effective visibility to the least restrictive + # of the old vs new. + if event.type == EventTypes.RoomHistoryVisibility: + prev_content = event.unsigned.get("prev_content", {}) + prev_visibility = prev_content.get("history_visibility", None) + + if prev_visibility not in VISIBILITY_PRIORITY: + prev_visibility = "shared" + + new_priority = VISIBILITY_PRIORITY.index(visibility) + old_priority = VISIBILITY_PRIORITY.index(prev_visibility) + if old_priority < new_priority: + visibility = prev_visibility + # get the user's membership at the time of the event. (or rather, # just *after* the event. Which means that people can see their # own join events, but not (currently) their own leave events.) @@ -160,10 +186,10 @@ class BaseHandler(object): ) defer.returnValue(res.get(user_id, [])) - def ratelimit(self, user_id): + def ratelimit(self, requester): time_now = self.clock.time() allowed, time_allowed = self.ratelimiter.send_message( - user_id, time_now, + requester.user.to_string(), time_now, msg_rate_hz=self.hs.config.rc_messages_per_second, burst_count=self.hs.config.rc_message_burst_count, ) @@ -199,8 +225,7 @@ class BaseHandler(object): # events in the room, because we don't know enough about the graph # fragment we received to treat it like a graph, so the above returned # no relevant events. It may have returned some events (if we have - # joined and left the room), but not useful ones, like the invite. So we - # forcibly set our context to the invite we received over federation. + # joined and left the room), but not useful ones, like the invite. if ( not self.is_host_in_room(context.current_state) and builder.type == EventTypes.Member @@ -208,7 +233,27 @@ class BaseHandler(object): prev_member_event = yield self.store.get_room_member( builder.sender, builder.room_id ) - if prev_member_event: + + # The prev_member_event may already be in context.current_state, + # despite us not being present in the room; in particular, if + # inviting user, and all other local users, have already left. + # + # In that case, we have all the information we need, and we don't + # want to drop "context" - not least because we may need to handle + # the invite locally, which will require us to have the whole + # context (not just prev_member_event) to auth it. + # + context_event_ids = ( + e.event_id for e in context.current_state.values() + ) + + if ( + prev_member_event and + prev_member_event.event_id not in context_event_ids + ): + # The prev_member_event is missing from context, so it must + # have arrived over federation and is an outlier. We forcibly + # set our context to the invite we received over federation builder.prev_events = ( prev_member_event.event_id, prev_member_event.prev_events @@ -263,11 +308,18 @@ class BaseHandler(object): return False @defer.inlineCallbacks - def handle_new_client_event(self, event, context, ratelimit=True, extra_users=[]): + def handle_new_client_event( + self, + requester, + event, + context, + ratelimit=True, + extra_users=[] + ): # We now need to go and hit out to wherever we need to hit out to. if ratelimit: - self.ratelimit(event.sender) + self.ratelimit(requester) self.auth.check(event, auth_events=context.current_state) @@ -307,12 +359,8 @@ class BaseHandler(object): "sender": e.sender, } for k, e in context.current_state.items() - if e.type in ( - EventTypes.JoinRules, - EventTypes.CanonicalAlias, - EventTypes.RoomAvatar, - EventTypes.Name, - ) or is_inviter_member_event(e) + if e.type in self.hs.config.room_invite_state_types + or is_inviter_member_event(e) ] invitee = UserID.from_string(event.state_key) @@ -348,6 +396,12 @@ class BaseHandler(object): "You don't have permission to redact events" ) + if event.type == EventTypes.Create and context.current_state: + 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, self |