From f4f3be8c30c0f0942f71866cdb9208b2a7c12cdd Mon Sep 17 00:00:00 2001
From: Benjamin Lee <benjamin@computer.surgery>
Date: Fri, 10 May 2024 19:01:50 -0700
Subject: [PATCH] implement per-event state filtering for left rooms in /sync

---
 src/api/client_server/sync.rs | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/api/client_server/sync.rs b/src/api/client_server/sync.rs
index 5ff886fe..718519ca 100644
--- a/src/api/client_server/sync.rs
+++ b/src/api/client_server/sync.rs
@@ -1097,7 +1097,11 @@ async fn handle_left_room(
         };
 
         State {
-            events: vec![event.to_sync_state_event()],
+            events: if filter.room.state.pdu_event_allowed(&event) {
+                vec![event.to_sync_state_event()]
+            } else {
+                vec![]
+            },
         }
     } else {
         let mut left_state_events = Vec::new();
@@ -1164,7 +1168,9 @@ async fn handle_left_room(
                         continue;
                     };
 
-                    left_state_events.push(pdu.to_sync_state_event());
+                    if filter.room.state.pdu_event_allowed(&pdu) {
+                        left_state_events.push(pdu.to_sync_state_event());
+                    }
 
                     i += 1;
                     if i % 100 == 0 {