diff options
| -rw-r--r-- | synapse/handlers/_base.py | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/synapse/handlers/_base.py b/synapse/handlers/_base.py index 2d56af5027..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.) |