Handle group call redaction

Redacted group call events should be interpreted as terminated calls.

Author: robintown

spec/test-utils/webrtc.ts

@@ -585,13 +585,15 @@ export function makeMockGroupCallStateEvent(
         "m.type": GroupCallType.Video,
         "m.intent": GroupCallIntent.Prompt,
     },
+    redacted?: boolean,
 ): MatrixEvent {
     return {
         getType: jest.fn().mockReturnValue(EventType.GroupCallPrefix),
         getRoomId: jest.fn().mockReturnValue(roomId),
         getTs: jest.fn().mockReturnValue(0),
         getContent: jest.fn().mockReturnValue(content),
         getStateKey: jest.fn().mockReturnValue(groupCallId),
+        isRedacted: jest.fn().mockReturnValue(redacted ?? false),
     } as unknown as MatrixEvent;
 }
 

spec/unit/webrtc/groupCallEventHandler.spec.ts

@@ -98,6 +98,23 @@ describe("Group Call Event Handler", function () {
 
             expect(groupCall.state).toBe(GroupCallState.Ended);
         });
+
+        it("terminates call when redacted", async () => {
+            await groupCallEventHandler.start();
+            mockClient.emitRoomState(makeMockGroupCallStateEvent(FAKE_ROOM_ID, FAKE_GROUP_CALL_ID), {
+                roomId: FAKE_ROOM_ID,
+            } as unknown as RoomState);
+
+            const groupCall = groupCallEventHandler.groupCalls.get(FAKE_ROOM_ID)!;
+
+            expect(groupCall.state).toBe(GroupCallState.LocalCallFeedUninitialized);
+
+            mockClient.emitRoomState(makeMockGroupCallStateEvent(FAKE_ROOM_ID, FAKE_GROUP_CALL_ID, undefined, true), {
+                roomId: FAKE_ROOM_ID,
+            } as unknown as RoomState);
+
+            expect(groupCall.state).toBe(GroupCallState.Ended);
+        });
     });
 
     it("waits until client starts syncing", async () => {
@@ -222,9 +239,9 @@ describe("Group Call Event Handler", function () {
             jest.clearAllMocks();
         });
 
-        const setupCallAndStart = async (content?: IContent) => {
+        const setupCallAndStart = async (content?: IContent, redacted?: boolean) => {
             mocked(mockRoom.currentState.getStateEvents).mockReturnValue([
-                makeMockGroupCallStateEvent(FAKE_ROOM_ID, FAKE_GROUP_CALL_ID, content),
+                makeMockGroupCallStateEvent(FAKE_ROOM_ID, FAKE_GROUP_CALL_ID, content, redacted),
             ] as unknown as MatrixEvent);
             mockClient.getRooms.mockReturnValue([mockRoom]);
             await groupCallEventHandler.start();
@@ -285,5 +302,24 @@ describe("Group Call Event Handler", function () {
                 }),
             );
         });
+
+        it("ignores redacted calls", async () => {
+            await setupCallAndStart(
+                {
+                    // Real event contents to make sure that it's specifically the
+                    // event being redacted that causes it to be ignored
+                    "m.type": GroupCallType.Video,
+                    "m.intent": GroupCallIntent.Prompt,
+                },
+                true,
+            );
+
+            expect(mockClientEmit).not.toHaveBeenCalledWith(
+                GroupCallEventHandlerEvent.Incoming,
+                expect.objectContaining({
+                    groupCallId: FAKE_GROUP_CALL_ID,
+                }),
+            );
+        });
     });
 });

src/webrtc/groupCallEventHandler.ts

@@ -118,7 +118,7 @@ export class GroupCallEventHandler {
         for (const callEvent of sortedCallEvents) {
             const content = callEvent.getContent();
 
-            if (content["m.terminated"]) {
+            if (content["m.terminated"] || callEvent.isRedacted()) {
                 continue;
             }
 
@@ -210,10 +210,10 @@ export class GroupCallEventHandler {
 
             const currentGroupCall = this.groupCalls.get(state.roomId);
 
-            if (!currentGroupCall && !content["m.terminated"]) {
+            if (!currentGroupCall && !content["m.terminated"] && !event.isRedacted()) {
                 this.createGroupCallFromRoomStateEvent(event);
             } else if (currentGroupCall && currentGroupCall.groupCallId === groupCallId) {
-                if (content["m.terminated"]) {
+                if (content["m.terminated"] || event.isRedacted()) {
                     currentGroupCall.terminate(false);
                 } else if (content["m.type"] !== currentGroupCall.type) {
                     // TODO: Handle the callType changing when the room state changes