Add UPDATE_STATE widget api version

.gitignore

@@ -3,6 +3,7 @@ lib/
 dist/
 .npmrc
 .idea
+.vscode
 
 # Logs
 logs

src/ClientWidgetApi.ts

@@ -40,7 +40,7 @@ import {
     ISupportedVersionsActionRequest,
     ISupportedVersionsActionResponseData,
 } from "./interfaces/SupportedVersionsAction";
-import { CurrentApiVersions } from "./interfaces/ApiVersion";
+import { ApiVersion, CurrentApiVersions, UnstableApiVersion } from "./interfaces/ApiVersion";
 import { IScreenshotActionResponseData } from "./interfaces/ScreenshotAction";
 import { IVisibilityActionRequestData } from "./interfaces/VisibilityAction";
 import { IWidgetApiAcknowledgeResponseData, IWidgetApiResponseData } from "./interfaces/IWidgetApiResponse";
@@ -138,6 +138,7 @@ import { IUpdateStateToWidgetRequestData } from "./interfaces/UpdateStateAction"
 export class ClientWidgetApi extends EventEmitter {
     public readonly transport: ITransport;
 
+    private cachedWidgetVersions: ApiVersion[] | null = null;
     // contentLoadedActionSent is used to check that only one ContentLoaded request is send.
     private contentLoadedActionSent = false;
     private allowedCapabilities = new Set<Capability>();
@@ -230,6 +231,24 @@ export class ClientWidgetApi extends EventEmitter {
         this.transport.stop();
     }
 
+    public async getWidgetVersions(): Promise<ApiVersion[]> {
+        if (Array.isArray(this.cachedWidgetVersions)) {
+            return Promise.resolve(this.cachedWidgetVersions);
+        }
+
+        try {
+            const r = await this.transport.send<IWidgetApiRequestEmptyData, ISupportedVersionsActionResponseData>(
+                WidgetApiToWidgetAction.SupportedApiVersions,
+                {},
+            );
+            this.cachedWidgetVersions = r.supported_versions;
+            return r.supported_versions;
+        } catch (e) {
+            console.warn("non-fatal error getting supported widget versions: ", e);
+            return [];
+        }
+    }
+
     private beginCapabilities(): void {
         // widget has loaded - tell all the listeners that
         this.emit("preparing");
@@ -285,7 +304,7 @@ export class ClientWidgetApi extends EventEmitter {
 
     private onIframeLoad(ev: Event): void {
         if (this.widget.waitForIframeLoad) {
-            // If the widget is set to waitForIframeLoad the capabilities immediatly get setup after load.
+            // If the widget is set to waitForIframeLoad the capabilities immediately get setup after load.
             // The client does not wait for the ContentLoaded action.
             this.beginCapabilities();
         } else {
@@ -1007,7 +1026,7 @@ export class ClientWidgetApi extends EventEmitter {
     public async feedEvent(rawEvent: IRoomEvent, currentViewedRoomId: string): Promise<void>;
     /**
      * Feeds an event to the widget. As a client you are expected to call this
-     * for every new event in every room to which you are joined or invited.
+     * for every new event (including state events) in every room to which you are joined or invited.
      * @param {IRoomEvent} rawEvent The event to (try to) send to the widget.
      * @returns {Promise<void>} Resolves when delivered or if the widget is not
      *   able to read the event due to permissions, rejects if the widget failed
@@ -1087,10 +1106,12 @@ export class ClientWidgetApi extends EventEmitter {
                     events.push(...stateKeyMap.values());
                 }
             }
-            await this.transport.send<IUpdateStateToWidgetRequestData>(
-                WidgetApiToWidgetAction.UpdateState,
-                { state: events },
-            );
+            if ((await this.getWidgetVersions()).includes(UnstableApiVersion.MSC2762_UPDATE_STATE)) {
+                // Only send state updates when using UpdateState. Otherwise the SendEvent action will be responsible for state updates.
+                await this.transport.send<IUpdateStateToWidgetRequestData>(WidgetApiToWidgetAction.UpdateState, {
+                    state: events,
+                });
+            }
         } finally {
             this.flushRoomStateTask = null;
         }
@@ -1149,21 +1170,23 @@ export class ClientWidgetApi extends EventEmitter {
      *   room state entry.
      * @returns {Promise<void>} Resolves when delivered or if the widget is not
      *   able to receive the room state due to permissions, rejects if the
-         widget failed to handle the update.
+     *   widget failed to handle the update.
      */
     public async feedStateUpdate(rawEvent: IRoomEvent): Promise<void> {
-        if (rawEvent.state_key === undefined) throw new Error('Not a state event');
+        if (rawEvent.state_key === undefined) throw new Error("Not a state event");
         if (
             (rawEvent.room_id === this.viewedRoomId || this.canUseRoomTimeline(rawEvent.room_id))
             && this.canReceiveStateEvent(rawEvent.type, rawEvent.state_key)
         ) {
             // Updates could race with the initial push of the room's state
             if (this.pushRoomStateTasks.size === 0) {
                 // No initial push tasks are pending; safe to send immediately
-                await this.transport.send<IUpdateStateToWidgetRequestData>(
-                    WidgetApiToWidgetAction.UpdateState,
-                    { state: [rawEvent] },
-                );
+                if ((await this.getWidgetVersions()).includes(UnstableApiVersion.MSC2762_UPDATE_STATE)) {
+                    // Only send state updates when using UpdateState. Otherwise the SendEvent action will be responsible for state updates.
+                    await this.transport.send<IUpdateStateToWidgetRequestData>(WidgetApiToWidgetAction.UpdateState, {
+                        state: [rawEvent],
+                    });
+                }
             } else {
                 // Lump the update in with whatever data will be sent in the
                 // initial push later. Even if we set it to an "outdated" entry

src/interfaces/ApiVersion.ts

@@ -22,6 +22,7 @@ export enum MatrixApiVersion {
 
 export enum UnstableApiVersion {
     MSC2762 = "org.matrix.msc2762",
+    MSC2762_UPDATE_STATE = "org.matrix.msc2762_update_state",
     MSC2871 = "org.matrix.msc2871",
     MSC2873 = "org.matrix.msc2873",
     MSC2931 = "org.matrix.msc2931",
@@ -41,6 +42,7 @@ export const CurrentApiVersions: ApiVersion[] = [
     MatrixApiVersion.Prerelease2,
     //MatrixApiVersion.V010,
     UnstableApiVersion.MSC2762,
+    UnstableApiVersion.MSC2762_UPDATE_STATE,
     UnstableApiVersion.MSC2871,
     UnstableApiVersion.MSC2873,
     UnstableApiVersion.MSC2931,

test/ClientWidgetApi-test.ts

@@ -19,17 +19,17 @@ import { waitFor } from '@testing-library/dom';
 
 import { ClientWidgetApi } from "../src/ClientWidgetApi";
 import { WidgetDriver } from "../src/driver/WidgetDriver";
-import { UnstableApiVersion } from '../src/interfaces/ApiVersion';
-import { Capability } from '../src/interfaces/Capabilities';
-import { IRoomEvent } from '../src/interfaces/IRoomEvent';
-import { IWidgetApiRequest } from '../src/interfaces/IWidgetApiRequest';
-import { IReadRelationsFromWidgetActionRequest } from '../src/interfaces/ReadRelationsAction';
-import { ISupportedVersionsActionRequest } from '../src/interfaces/SupportedVersionsAction';
-import { IUserDirectorySearchFromWidgetActionRequest } from '../src/interfaces/UserDirectorySearchAction';
-import { WidgetApiFromWidgetAction, WidgetApiToWidgetAction } from '../src/interfaces/WidgetApiAction';
-import { WidgetApiDirection } from '../src/interfaces/WidgetApiDirection';
-import { Widget } from '../src/models/Widget';
-import { PostmessageTransport } from '../src/transport/PostmessageTransport';
+import { CurrentApiVersions, UnstableApiVersion } from "../src/interfaces/ApiVersion";
+import { Capability } from "../src/interfaces/Capabilities";
+import { IRoomEvent } from "../src/interfaces/IRoomEvent";
+import { IWidgetApiRequest } from "../src/interfaces/IWidgetApiRequest";
+import { IReadRelationsFromWidgetActionRequest } from "../src/interfaces/ReadRelationsAction";
+import { ISupportedVersionsActionRequest } from "../src/interfaces/SupportedVersionsAction";
+import { IUserDirectorySearchFromWidgetActionRequest } from "../src/interfaces/UserDirectorySearchAction";
+import { WidgetApiFromWidgetAction, WidgetApiToWidgetAction } from "../src/interfaces/WidgetApiAction";
+import { WidgetApiDirection } from "../src/interfaces/WidgetApiDirection";
+import { Widget } from "../src/models/Widget";
+import { PostmessageTransport } from "../src/transport/PostmessageTransport";
 import {
     IDownloadFileActionFromWidgetActionRequest,
     IGetOpenIDActionRequest,
@@ -792,6 +792,14 @@ describe('ClientWidgetApi', () => {
             const roomId = '!room:example.org';
             const otherRoomId = '!other-room:example.org';
             clientWidgetApi.setViewedRoomId(roomId);
+
+            jest.spyOn(transport, "send").mockImplementation((action, data) => {
+                if (action === WidgetApiToWidgetAction.SupportedApiVersions) {
+                    return Promise.resolve({ supported_versions: CurrentApiVersions });
+                }
+                return Promise.resolve({});
+            });
+
             const topicEvent = createRoomEvent({
                 room_id: roomId,
                 type: 'm.room.topic',
@@ -904,6 +912,37 @@ describe('ClientWidgetApi', () => {
         });
     });
 
+    describe('dont receive UpdateState if version not supported', () => {
+        it('syncs initial state and feeds updates', async () => {
+            const roomId = '!room:example.org';
+            clientWidgetApi.setViewedRoomId(roomId);
+            jest.spyOn(transport, "send").mockImplementation((action, data) => {
+                if (action === WidgetApiToWidgetAction.SupportedApiVersions) {
+                    return Promise.resolve({ supported_versions: [] });
+                }
+                return Promise.resolve({});
+            });
+
+            await loadIframe([
+                'org.matrix.msc2762.receive.state_event:m.room.join_rules#',
+            ]);
+
+            const newJoinRulesEvent = createRoomEvent({
+                room_id: roomId,
+                type: 'm.room.join_rules',
+                state_key: '',
+                content: { join_rule: 'invite' },
+            });
+            clientWidgetApi.feedStateUpdate(newJoinRulesEvent);
+
+            await waitFor(() => {
+
+                // Only the updated join rules should have been delivered
+                expect(transport.send).not.toHaveBeenCalledWith(WidgetApiToWidgetAction.UpdateState);
+            });
+        });
+    });
+
     describe('update_delayed_event action', () => {
         it('fails to update delayed events', async () => {
             const event: IUpdateDelayedEventFromWidgetActionRequest = {