diff options
Diffstat (limited to 'synapse/handlers/message.py')
| -rw-r--r-- | synapse/handlers/message.py | 47 |
1 files changed, 44 insertions, 3 deletions
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py index a0103addd3..0c84c6cec4 100644 --- a/synapse/handlers/message.py +++ b/synapse/handlers/message.py @@ -888,19 +888,60 @@ class EventCreationHandler(object): yield self.base_handler.maybe_kick_guest_users(event, context) if event.type == EventTypes.CanonicalAlias: - # Check the alias is acually valid (at this time at least) + # Validate a newly added alias or newly added alt_aliases. + + original_alias = None + original_alt_aliases = set() + + original_event_id = event.unsigned.get("replaces_state") + if original_event_id: + original_event = yield self.store.get_event(original_event_id) + + if original_event: + original_alias = original_event.content.get("alias", None) + original_alt_aliases = original_event.content.get("alt_aliases", []) + + # Check the alias is currently valid (if it has changed). room_alias_str = event.content.get("alias", None) - if room_alias_str: + directory_handler = self.hs.get_handlers().directory_handler + if room_alias_str and room_alias_str != original_alias: room_alias = RoomAlias.from_string(room_alias_str) - directory_handler = self.hs.get_handlers().directory_handler mapping = yield directory_handler.get_association(room_alias) if mapping["room_id"] != event.room_id: raise SynapseError( 400, "Room alias %s does not point to the room" % (room_alias_str,), + Codes.BAD_ALIAS, ) + # Check that alt_aliases is the proper form. + alt_aliases = event.content.get("alt_aliases", []) + if not isinstance(alt_aliases, (list, tuple)): + raise SynapseError( + 400, "The alt_aliases property must be a list.", Codes.INVALID_PARAM + ) + + # If the old version of alt_aliases is of an unknown form, + # completely replace it. + if not isinstance(original_alt_aliases, (list, tuple)): + original_alt_aliases = [] + + # Check that each alias is currently valid. + new_alt_aliases = set(alt_aliases) - set(original_alt_aliases) + if new_alt_aliases: + for alias_str in new_alt_aliases: + room_alias = RoomAlias.from_string(alias_str) + mapping = yield directory_handler.get_association(room_alias) + + if mapping["room_id"] != event.room_id: + raise SynapseError( + 400, + "Room alias %s does not point to the room" + % (room_alias_str,), + Codes.BAD_ALIAS, + ) + federation_handler = self.hs.get_handlers().federation_handler if event.type == EventTypes.Member: |