add option to forget archived room

src/domain/session/room/RoomViewModel.js

@@ -140,6 +140,14 @@ export class RoomViewModel extends ViewModel {
         this._room.leave();
     }
 
+    get canForget() {
+        return this._room.isArchived;
+    }
+
+    forgetRoom() {
+        this._room.forget();
+    }
+    
     async _sendMessage(message) {
         if (!this._room.isArchived && message) {
             try {
@@ -270,7 +278,6 @@ export class RoomViewModel extends ViewModel {
         }
     }
     
-
     get composerViewModel() {
         return this._composerVM;
     }

src/matrix/Session.js

@@ -85,6 +85,7 @@ export class Session {
             });
         }
         this._createRoomEncryption = this._createRoomEncryption.bind(this);
+        this._forgetArchivedRoom = this._forgetArchivedRoom.bind(this);
         this.needsSessionBackup = new ObservableValue(false);
     }
 
@@ -407,6 +408,7 @@ export class Session {
             storage: this._storage,
             emitCollectionChange: () => {},
             releaseCallback: () => this._activeArchivedRooms.delete(roomId),
+            forgetCallback: this._forgetArchivedRoom,
             hsApi: this._hsApi,
             mediaRepository: this._mediaRepository,
             user: this._user,
@@ -555,6 +557,13 @@ export class Session {
         }
     }
 
+    _forgetArchivedRoom(roomId) {
+        const statusObservable = this._observedRoomStatus.get(roomId);
+        if (statusObservable) {
+            statusObservable.set(statusObservable.get().withoutArchived());
+        }
+    }
+
     /** @internal */
     get syncToken() {
         return this._syncInfo?.token;

src/matrix/net/HomeServerApi.js

@@ -193,6 +193,10 @@ export class HomeServerApi {
     leave(roomId, options = null) {
         return this._post(`/rooms/${encodeURIComponent(roomId)}/leave`, null, null, options);
     }
+
+    forget(roomId, options = null) {
+        return this._post(`/rooms/${encodeURIComponent(roomId)}/forget`, null, null, options);
+    }
 }
 
 import {Request as MockRequest} from "../../mocks/Request.js";

src/matrix/room/ArchivedRoom.js

@@ -24,6 +24,7 @@ export class ArchivedRoom extends BaseRoom {
         // archived rooms are reference counted,
         // as they are not kept in memory when not needed
         this._releaseCallback = options.releaseCallback;
+        this._forgetCallback = options.forgetCallback;
         this._retentionCount = 1;
         /**
         Some details from our own member event when being kicked or banned.
@@ -126,8 +127,40 @@ export class ArchivedRoom extends BaseRoom {
         return true;
     }
 
-    forget() {
+    forget(log = null) {
+        return this._platform.logger.wrapOrRun(log, "forget room", async log => {
+            log.set("id", this.id);
+            await this._hsApi.forget(this.id, {log}).response();
+            const storeNames = this._storage.storeNames;
+            const txn = await this._storage.readWriteTxn([
+                storeNames.roomState,
+                storeNames.archivedRoomSummary,
+                storeNames.roomMembers,
+                storeNames.timelineEvents,
+                storeNames.timelineFragments,
+                storeNames.pendingEvents,
+                storeNames.inboundGroupSessions,
+                storeNames.groupSessionDecryptions,
+                storeNames.operations,
+            ]);
 
+            txn.roomState.removeAllForRoom(this.id);
+            txn.archivedRoomSummary.remove(this.id);
+            txn.roomMembers.removeAllForRoom(this.id);
+            txn.timelineEvents.removeAllForRoom(this.id);
+            txn.timelineFragments.removeAllForRoom(this.id);
+            txn.pendingEvents.removeAllForRoom(this.id);
+            txn.inboundGroupSessions.removeAllForRoom(this.id);
+            txn.groupSessionDecryptions.removeAllForRoom(this.id);
+            await txn.operations.removeAllForScope(this.id);
+
+            await txn.complete();
+
+            this._retentionCount = 0;
+            this._releaseCallback();
+            
+            this._forgetCallback(this.id);
+        });
     }
 }
 

src/matrix/room/RoomStatus.js

@@ -42,6 +42,16 @@ export class RoomStatus {
             return RoomStatus.none;
         }
     }
+
+    withoutArchived() {
+        if (!this.archived) {
+            return this;
+        } else if (this.invited) {
+            return RoomStatus.invited;
+        } else {
+            return RoomStatus.none;
+        }
+    }
 }
 
 RoomStatus.joined = new RoomStatus(true, false, false);

src/platform/web/ui/session/room/RoomView.js

@@ -70,6 +70,9 @@ export class RoomView extends TemplateView {
             if (vm.canLeave) {
                 options.push(Menu.option(vm.i18n`Leave room`, () => vm.leaveRoom()));
             }
+            if (vm.canForget) {
+                options.push(Menu.option(vm.i18n`Forget room`, () => vm.forgetRoom()));
+            }
             if (!options.length) {
                 return;
             }