Allow navigating away from unknown room view

frontend/iframe/viewmodels/SessionViewModel.ts

@@ -1,5 +1,6 @@
 import { SessionViewModel as BaseSessionViewModel } from "hydrogen-web/src/domain/session/SessionViewModel";
 import { RoomViewModel } from "./RoomViewModel";
+import { UnknownRoomViewModel } from "./UnknownRoomVideoModel";
 import { SettingsViewModel } from "./SettingsViewModel";
 
 export class SessionViewModel extends BaseSessionViewModel {
@@ -110,4 +111,14 @@ export class SessionViewModel extends BaseSessionViewModel {
         }
         return null;
     }
+
+    async _createUnknownRoomViewModel(roomIdOrAlias, isWorldReadablePromise) {
+        return new UnknownRoomViewModel(super.childOptions({
+            roomIdOrAlias,
+            session: this.client.session,
+            isWorldReadablePromise: isWorldReadablePromise,
+            guestJoinAllowed: false,
+            singleRoomId: this._singleRoomId,
+        }));
+    }
 }

frontend/iframe/viewmodels/UnknownRoomVideoModel.ts

@@ -0,0 +1,29 @@
+import {UnknownRoomViewModel as BaseUnknownRoomViewModel} from "hydrogen-web/src/domain/session/room/UnknownRoomViewModel";
+import {SegmentType} from "hydrogen-web/src/domain/navigation";
+import {Segment} from "hydrogen-web/src/domain/navigation/Navigation";
+
+export class UnknownRoomViewModel extends BaseUnknownRoomViewModel {
+    private readonly _singleRoomId: any;
+
+    constructor(options) {
+        super(options);
+        this._singleRoomId = options.singleRoomId;
+    }
+
+    get navigation() {
+        return super.navigation;
+    }
+
+    get urlRouter() {
+        return super.urlRouter;
+    }
+
+    get closeUrl() {
+        if (this._singleRoomId) {
+            const path = this.navigation.path.with(new Segment<SegmentType>("session"));
+            return this.urlRouter.urlForPath(path);
+        }
+
+        return super.closeUrl;
+    }
+}