Support delayed events (MSC4140) for call widget

The Widget API spec for delayed events is defined by MSC4157.

Also support "parent" delayed events, which were in a previous version
of MSC4140 and may be reintroduced or be part of a new MSC later.

package.json

@@ -119,7 +119,7 @@
         "matrix-encrypt-attachment": "^1.0.3",
         "matrix-events-sdk": "0.0.1",
         "matrix-js-sdk": "github:matrix-org/matrix-js-sdk#develop",
-        "matrix-widget-api": "^1.5.0",
+        "matrix-widget-api": "^1.8.2",
         "memoize-one": "^6.0.0",
         "minimist": "^1.2.5",
         "oidc-client-ts": "^3.0.1",

src/stores/widgets/StopGapWidgetDriver.ts

@@ -19,6 +19,7 @@ import {
     EventDirection,
     IOpenIDCredentials,
     IOpenIDUpdate,
+    ISendDelayedEventDetails,
     ISendEventDetails,
     ITurnServer,
     IReadEventRelationsResult,
@@ -33,6 +34,7 @@ import {
     WidgetKind,
     ISearchUserDirectoryResult,
     IGetMediaConfigResult,
+    UpdateDelayedEventAction,
 } from "matrix-widget-api";
 import {
     ClientEvent,
@@ -43,6 +45,7 @@ import {
     Room,
     Direction,
     THREAD_RELATION_TYPE,
+    SendDelayedEventResponse,
     StateEvents,
     TimelineEvents,
 } from "matrix-js-sdk/src/matrix";
@@ -128,6 +131,8 @@ export class StopGapWidgetDriver extends WidgetDriver {
             this.allowedCapabilities.add(MatrixCapabilities.AlwaysOnScreen);
             this.allowedCapabilities.add(MatrixCapabilities.MSC3846TurnServers);
             this.allowedCapabilities.add(`org.matrix.msc2762.timeline:${inRoomId}`);
+            this.allowedCapabilities.add(MatrixCapabilities.MSC4157SendDelayedEvent);
+            this.allowedCapabilities.add(MatrixCapabilities.MSC4157UpdateDelayedEvent);
 
             this.allowedCapabilities.add(
                 WidgetEventCapability.forRoomEvent(EventDirection.Send, "org.matrix.rageshake_request").raw,
@@ -160,7 +165,7 @@ export class StopGapWidgetDriver extends WidgetDriver {
                         `_${clientUserId}_${clientDeviceId}`,
                     ).raw,
                 );
-                // MSC3779 version, with no leading underscore
+                // Version with no leading underscore, for room versions whose auth rules allow it
                 this.allowedCapabilities.add(
                     WidgetEventCapability.forStateEvent(
                         EventDirection.Send,
@@ -271,20 +276,20 @@ export class StopGapWidgetDriver extends WidgetDriver {
     public async sendEvent<K extends keyof StateEvents>(
         eventType: K,
         content: StateEvents[K],
-        stateKey?: string,
-        targetRoomId?: string,
+        stateKey: string | null,
+        targetRoomId: string | null,
     ): Promise<ISendEventDetails>;
     public async sendEvent<K extends keyof TimelineEvents>(
         eventType: K,
         content: TimelineEvents[K],
         stateKey: null,
-        targetRoomId?: string,
+        targetRoomId: string | null,
     ): Promise<ISendEventDetails>;
     public async sendEvent(
         eventType: string,
         content: IContent,
-        stateKey?: string | null,
-        targetRoomId?: string,
+        stateKey: string | null = null,
+        targetRoomId: string | null = null,
     ): Promise<ISendEventDetails> {
         const client = MatrixClientPeg.get();
         const roomId = targetRoomId || SdkContextClass.instance.roomViewStore.getRoomId();
@@ -328,6 +333,94 @@ export class StopGapWidgetDriver extends WidgetDriver {
         return { roomId, eventId: r.event_id };
     }
 
+    /**
+     * @experimental Part of MSC4140 & MSC4157
+     * @see {@link WidgetDriver#sendDelayedEvent}
+     */
+    public async sendDelayedEvent<K extends keyof StateEvents>(
+        delay: number | null,
+        parentDelayId: string | null,
+        eventType: K,
+        content: StateEvents[K],
+        stateKey: string | null,
+        targetRoomId: string | null,
+    ): Promise<ISendDelayedEventDetails>;
+    /**
+     * @experimental Part of MSC4140 & MSC4157
+     */
+    public async sendDelayedEvent<K extends keyof TimelineEvents>(
+        delay: number | null,
+        parentDelayId: string | null,
+        eventType: K,
+        content: TimelineEvents[K],
+        stateKey: null,
+        targetRoomId: string | null,
+    ): Promise<ISendDelayedEventDetails>;
+    public async sendDelayedEvent(
+        delay: number | null,
+        parentDelayId: string | null,
+        eventType: string,
+        content: IContent,
+        stateKey: string | null = null,
+        targetRoomId: string | null = null,
+    ): Promise<ISendDelayedEventDetails> {
+        const client = MatrixClientPeg.get();
+        const roomId = targetRoomId || SdkContextClass.instance.roomViewStore.getRoomId();
+
+        if (!client || !roomId) throw new Error("Not in a room or not attached to a client");
+
+        let delayOpts;
+        if (delay !== null) {
+            delayOpts = {
+                delay,
+                ...(parentDelayId !== null && { parent_delay_id: parentDelayId }),
+            };
+        } else if (parentDelayId !== null) {
+            delayOpts = {
+                parent_delay_id: parentDelayId,
+            };
+        } else {
+            throw new Error("Must provide at least one of delay or parentDelayId");
+        }
+
+        let r: SendDelayedEventResponse | null;
+        if (stateKey !== null) {
+            // state event
+            r = await client._unstable_sendDelayedStateEvent(
+                roomId,
+                delayOpts,
+                eventType as keyof StateEvents,
+                content as StateEvents[keyof StateEvents],
+                stateKey,
+            );
+        } else {
+            // message event
+            r = await client._unstable_sendDelayedEvent(
+                roomId,
+                delayOpts,
+                null,
+                eventType as keyof TimelineEvents,
+                content as TimelineEvents[keyof TimelineEvents],
+            );
+        }
+
+        return {
+            roomId,
+            delayId: r.delay_id,
+        };
+    }
+
+    /**
+     * @experimental Part of MSC4140 & MSC4157
+     */
+    public async updateDelayedEvent(delayId: string, action: UpdateDelayedEventAction): Promise<void> {
+        const client = MatrixClientPeg.get();
+
+        if (!client) throw new Error("Not in a room or not attached to a client");
+
+        await client._unstable_updateDelayedEvent(delayId, action);
+    }
+
     public async sendToDevice(
         eventType: string,
         encrypted: boolean,

test/stores/widgets/StopGapWidgetDriver-test.ts

@@ -35,6 +35,7 @@ import {
     SimpleObservable,
     OpenIDRequestState,
     IOpenIDUpdate,
+    UpdateDelayedEventAction,
 } from "matrix-widget-api";
 import {
     ApprovalOpts,
@@ -122,6 +123,8 @@ describe("StopGapWidgetDriver", () => {
             "org.matrix.msc3819.receive.to_device:org.matrix.call.sdp_stream_metadata_changed",
             "org.matrix.msc3819.send.to_device:m.call.replaces",
             "org.matrix.msc3819.receive.to_device:m.call.replaces",
+            "org.matrix.msc4157.send.delayed_event",
+            "org.matrix.msc4157.update_delayed_event",
         ]);
 
         // As long as this resolves, we'll know that it didn't try to pop up a modal
@@ -388,6 +391,125 @@ describe("StopGapWidgetDriver", () => {
         });
     });
 
+    describe("sendDelayedEvent", () => {
+        let driver: WidgetDriver;
+        const roomId = "!this-room-id";
+
+        beforeEach(() => {
+            driver = mkDefaultDriver();
+        });
+
+        it("cannot send delayed events with missing arguments", async () => {
+            await expect(driver.sendDelayedEvent(null, null, EventType.RoomMessage, {})).rejects.toThrow(
+                "Must provide at least one of",
+            );
+        });
+
+        it("sends delayed message events", async () => {
+            client._unstable_sendDelayedEvent.mockResolvedValue({
+                delay_id: "id",
+            });
+
+            await expect(driver.sendDelayedEvent(2000, null, EventType.RoomMessage, {})).resolves.toEqual({
+                roomId,
+                delayId: "id",
+            });
+
+            expect(client._unstable_sendDelayedEvent).toHaveBeenCalledWith(
+                roomId,
+                { delay: 2000 },
+                null,
+                EventType.RoomMessage,
+                {},
+            );
+        });
+
+        it("sends child action delayed message events", async () => {
+            client._unstable_sendDelayedEvent.mockResolvedValue({
+                delay_id: "id-child",
+            });
+
+            await expect(driver.sendDelayedEvent(null, "id-parent", EventType.RoomMessage, {})).resolves.toEqual({
+                roomId,
+                delayId: "id-child",
+            });
+
+            expect(client._unstable_sendDelayedEvent).toHaveBeenCalledWith(
+                roomId,
+                { parent_delay_id: "id-parent" },
+                null,
+                EventType.RoomMessage,
+                {},
+            );
+        });
+
+        it("sends delayed state events", async () => {
+            client._unstable_sendDelayedStateEvent.mockResolvedValue({
+                delay_id: "id",
+            });
+
+            await expect(driver.sendDelayedEvent(2000, null, EventType.RoomTopic, {}, "")).resolves.toEqual({
+                roomId,
+                delayId: "id",
+            });
+
+            expect(client._unstable_sendDelayedStateEvent).toHaveBeenCalledWith(
+                roomId,
+                { delay: 2000 },
+                EventType.RoomTopic,
+                {},
+                "",
+            );
+        });
+
+        it("sends child action delayed state events", async () => {
+            client._unstable_sendDelayedStateEvent.mockResolvedValue({
+                delay_id: "id-child",
+            });
+
+            await expect(driver.sendDelayedEvent(null, "id-parent", EventType.RoomTopic, {}, "")).resolves.toEqual({
+                roomId,
+                delayId: "id-child",
+            });
+
+            expect(client._unstable_sendDelayedStateEvent).toHaveBeenCalledWith(
+                roomId,
+                { parent_delay_id: "id-parent" },
+                EventType.RoomTopic,
+                {},
+                "",
+            );
+        });
+    });
+
+    describe("updateDelayedEvent", () => {
+        let driver: WidgetDriver;
+
+        beforeEach(() => {
+            driver = mkDefaultDriver();
+        });
+
+        it("updates delayed events", async () => {
+            client._unstable_updateDelayedEvent.mockResolvedValue({});
+            for (const action of [
+                UpdateDelayedEventAction.Cancel,
+                UpdateDelayedEventAction.Restart,
+                UpdateDelayedEventAction.Send,
+            ]) {
+                await expect(driver.updateDelayedEvent("id", action)).resolves.toBeUndefined();
+                expect(client._unstable_updateDelayedEvent).toHaveBeenCalledWith("id", action);
+            }
+        });
+
+        it("fails to update delayed events", async () => {
+            const errorMessage = "Cannot restart this delayed event";
+            client._unstable_updateDelayedEvent.mockRejectedValue(new Error(errorMessage));
+            await expect(driver.updateDelayedEvent("id", UpdateDelayedEventAction.Restart)).rejects.toThrow(
+                errorMessage,
+            );
+        });
+    });
+
     describe("If the feature_dynamic_room_predecessors feature is not enabled", () => {
         beforeEach(() => {
             jest.spyOn(SettingsStore, "getValue").mockReturnValue(false);

test/test-utils/test-utils.ts

@@ -252,6 +252,10 @@ export function createTestClient(): MatrixClient {
             });
         }),
 
+        _unstable_sendDelayedEvent: jest.fn(),
+        _unstable_sendDelayedStateEvent: jest.fn(),
+        _unstable_updateDelayedEvent: jest.fn(),
+
         searchUserDirectory: jest.fn().mockResolvedValue({ limited: false, results: [] }),
         setDeviceVerified: jest.fn(),
         joinRoom: jest.fn(),

yarn.lock

@@ -6938,10 +6938,10 @@ matrix-web-i18n@^3.2.1:
     minimist "^1.2.8"
     walk "^2.3.15"
 
-matrix-widget-api@^1.5.0:
-  version "1.7.0"
-  resolved "https://registry.yarnpkg.com/matrix-widget-api/-/matrix-widget-api-1.7.0.tgz#ae3b44380f11bb03519d0bf0373dfc3341634667"
-  integrity sha512-dzSnA5Va6CeIkyWs89xZty/uv38HLyfjOrHGbbEikCa2ZV0HTkUNtrBMKlrn4CRYyDJ6yoO/3ssRwiR0jJvOkQ==
+matrix-widget-api@^1.8.2:
+  version "1.8.2"
+  resolved "https://registry.yarnpkg.com/matrix-widget-api/-/matrix-widget-api-1.8.2.tgz#28d344502a85593740f560b0f8120e474a054505"
+  integrity sha512-kdmks3CvFNPIYN669Y4rO13KrazDvX8KHC7i6jOzJs8uZ8s54FNkuRVVyiQHeVCSZG5ixUqW9UuCj9lf03qxTQ==
   dependencies:
     "@types/events" "^3.0.0"
     events "^3.2.0"