feat(ffi): Add FFI bindings for Room::forget.

Also make sure rooms the user has been banned from can also be forgotten, not only left ones.

bindings/matrix-sdk-ffi/src/room.rs

@@ -1033,6 +1033,16 @@ impl Room {
             }
         })))
     }
+
+    /// Forget this room.
+    ///
+    /// This communicates to the homeserver that it should forget the room.
+    ///
+    /// Only left or banned-from rooms can be forgotten.
+    pub async fn forget(&self) -> Result<(), ClientError> {
+        self.inner.forget().await?;
+        Ok(())
+    }
 }
 
 /// A listener for receiving new live location shares in a room.

crates/matrix-sdk/src/room/mod.rs

@@ -2896,11 +2896,14 @@ impl Room {
     ///
     /// This communicates to the homeserver that it should forget the room.
     ///
-    /// Only left rooms can be forgotten.
+    /// Only left or banned-from rooms can be forgotten.
     pub async fn forget(&self) -> Result<()> {
         let state = self.state();
-        if state != RoomState::Left {
-            return Err(Error::WrongRoomState(WrongRoomState::new("Left", state)));
+        match state {
+            RoomState::Joined | RoomState::Invited | RoomState::Knocked => {
+                return Err(Error::WrongRoomState(WrongRoomState::new("Left / Banned", state)));
+            }
+            RoomState::Left | RoomState::Banned => {}
         }
 
         let request = forget_room::v3::Request::new(self.inner.room_id().to_owned());

crates/matrix-sdk/tests/integration/room/left.rs

@@ -2,7 +2,7 @@ use std::time::Duration;
 
 use assert_matches2::assert_matches;
 use matrix_sdk::config::SyncSettings;
-use matrix_sdk_base::RoomState;
+use matrix_sdk_base::{RoomInfoNotableUpdateReasons, RoomState};
 use matrix_sdk_test::{
     async_test, test_json, GlobalAccountDataTestEvent, LeftRoomBuilder, SyncResponseBuilder,
     DEFAULT_TEST_ROOM_ID,
@@ -77,6 +77,67 @@ async fn test_forget_non_direct_room() {
     }
 }
 
+#[async_test]
+async fn test_forget_banned_room() {
+    let (client, server) = logged_in_client_with_server().await;
+    let user_id = client.user_id().unwrap();
+
+    let event_cache = client.event_cache();
+    event_cache.subscribe().unwrap();
+    event_cache.enable_storage().unwrap();
+
+    Mock::given(method("POST"))
+        .and(path_regex(r"^/_matrix/client/r0/rooms/.*/forget$"))
+        .and(header("authorization", "Bearer 1234"))
+        .respond_with(ResponseTemplate::new(200).set_body_json(&*test_json::EMPTY))
+        .named("forget")
+        .expect(1)
+        .mount(&server)
+        .await;
+
+    Mock::given(method("PUT"))
+        .and(path(format!("/_matrix/client/r0/user/{user_id}/account_data/m.direct")))
+        .and(header("authorization", "Bearer 1234"))
+        .respond_with(ResponseTemplate::new(200).set_body_json(&*test_json::EMPTY))
+        .named("set_mdirect")
+        .expect(0)
+        .mount(&server)
+        .await;
+
+    mock_sync(&server, &*test_json::LEAVE_SYNC, None).await;
+
+    let sync_settings = SyncSettings::new().timeout(Duration::from_millis(3000));
+    let _response = client.sync_once(sync_settings).await.unwrap();
+
+    // Let the event cache process updates.
+    yield_now().await;
+
+    {
+        // There is some data in the cache store.
+        let event_cache_store = client.event_cache_store().lock().await.unwrap();
+        let room_data = event_cache_store.reload_linked_chunk(&DEFAULT_TEST_ROOM_ID).await.unwrap();
+        assert!(!room_data.is_empty());
+    }
+
+    // Make the room banned
+    let room = client.get_room(&DEFAULT_TEST_ROOM_ID).unwrap();
+    let mut room_info = room.clone_info();
+    room_info.mark_as_banned();
+    room.set_room_info(room_info, RoomInfoNotableUpdateReasons::MEMBERSHIP);
+    assert_eq!(room.state(), RoomState::Banned);
+
+    room.forget().await.unwrap();
+
+    assert!(client.get_room(&DEFAULT_TEST_ROOM_ID).is_none());
+
+    {
+        // Data in the event cache store has been removed.
+        let event_cache_store = client.event_cache_store().lock().await.unwrap();
+        let room_data = event_cache_store.reload_linked_chunk(&DEFAULT_TEST_ROOM_ID).await.unwrap();
+        assert!(room_data.is_empty());
+    }
+}
+
 #[async_test]
 async fn test_forget_direct_room() {
     let (client, server) = logged_in_client_with_server().await;