Fix stringified promises in HTML exports

Fixes element-hq/element-web#24272

HtmlExporter was coercing Promises into strings. This removes the unecessary
async labels on the offending methods.

Signed-off-by: Clark Fischer <clark.fischer@gmail.com>

src/utils/exportUtils/HtmlExport.tsx

@@ -238,7 +238,7 @@ export default class HTMLExporter extends Exporter {
         }
     }
 
-    protected async getDateSeparator(event: MatrixEvent): Promise<string> {
+    protected getDateSeparator(event: MatrixEvent): string {
         const ts = event.getTs();
         const dateSeparator = (
             <li key={ts}>
@@ -248,7 +248,7 @@ export default class HTMLExporter extends Exporter {
         return renderToStaticMarkup(dateSeparator);
     }
 
-    protected async needsDateSeparator(event: MatrixEvent, prevEvent: MatrixEvent | null): Promise<boolean> {
+    protected needsDateSeparator(event: MatrixEvent, prevEvent: MatrixEvent | null): boolean {
         if (prevEvent == null) return true;
         return wantsDateSeparator(prevEvent.getDate() || undefined, event.getDate() || undefined);
     }
@@ -400,7 +400,7 @@ export default class HTMLExporter extends Exporter {
             if (this.cancelled) return this.cleanUp();
             if (!haveRendererForEvent(event, false)) continue;
 
-            content += (await this.needsDateSeparator(event, prevEvent)) ? this.getDateSeparator(event) : "";
+            content += this.needsDateSeparator(event, prevEvent) ? this.getDateSeparator(event) : "";
             const shouldBeJoined =
                 !this.needsDateSeparator(event, prevEvent) &&
                 shouldFormContinuation(prevEvent, event, false, this.threadsEnabled);

src/utils/exportUtils/exportCSS.ts

@@ -58,8 +58,8 @@ const getExportCSS = async (usedClasses: Set<string>): Promise<string> => {
 
     // If the light theme isn't loaded we will have to fetch & parse it manually
     if (!stylesheets.some(isLightTheme)) {
-        const href = document.querySelector<HTMLLinkElement>('link[rel="stylesheet"][href$="theme-light.css"]').href;
-        stylesheets.push(await getRulesFromCssFile(href));
+        const href = document.querySelector<HTMLLinkElement>('link[rel="stylesheet"][href$="theme-light.css"]')?.href;
+        if (href) stylesheets.push(await getRulesFromCssFile(href));
     }
 
     let css = "";

test/test-utils/test-utils.ts

@@ -207,6 +207,10 @@ export function createTestClient(): MatrixClient {
         setPassword: jest.fn().mockRejectedValue({}),
         groupCallEventHandler: { groupCalls: new Map<string, GroupCall>() },
         redactEvent: jest.fn(),
+
+        createMessagesRequest: jest.fn().mockResolvedValue({
+            chunk: [],
+        }),
     } as unknown as MatrixClient;
 
     client.reEmitter = new ReEmitter(client);

test/utils/exportUtils/HTMLExport-test.ts

@@ -1,5 +1,5 @@
 /*
-Copyright 2022 The Matrix.org Foundation C.I.C.
+Copyright 2022 - 2023 The Matrix.org Foundation C.I.C.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -14,26 +14,36 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import { mocked } from "jest-mock";
+import { EventType, IRoomEvent, MatrixClient, Room } from "matrix-js-sdk/src/matrix";
 
-import { createTestClient, mkStubRoom, REPEATABLE_DATE } from "../../test-utils";
+import { mkStubRoom, REPEATABLE_DATE, stubClient } from "../../test-utils";
 import { ExportType, IExportOptions } from "../../../src/utils/exportUtils/exportUtils";
 import SdkConfig from "../../../src/SdkConfig";
 import HTMLExporter from "../../../src/utils/exportUtils/HtmlExport";
+import DMRoomMap from "../../../src/utils/DMRoomMap";
+
+jest.mock("jszip");
 
 describe("HTMLExport", () => {
+    let client: jest.Mocked<MatrixClient>;
+
     beforeEach(() => {
         jest.useFakeTimers();
         jest.setSystemTime(REPEATABLE_DATE);
-    });
 
-    afterEach(() => {
-        mocked(SdkConfig.get).mockRestore();
+        client = stubClient() as jest.Mocked<MatrixClient>;
+        DMRoomMap.makeShared();
     });
 
+    function getMessageFile(exporter: HTMLExporter): Blob {
+        //@ts-ignore private access
+        const files = exporter.files;
+        const file = files.find((f) => f.name == "messages.html")!;
+        return file.blob;
+    }
+
     it("should have an SDK-branded destination file name", () => {
         const roomName = "My / Test / Room: Welcome";
-        const client = createTestClient();
         const stubOptions: IExportOptions = {
             attachmentsIncluded: false,
             maxSize: 50000000,
@@ -43,10 +53,42 @@ describe("HTMLExport", () => {
 
         expect(exporter.destinationFileName).toMatchSnapshot();
 
-        jest.spyOn(SdkConfig, "get").mockImplementation(() => {
-            return { brand: "BrandedChat/WithSlashes/ForFun" };
-        });
+        SdkConfig.put({ brand: "BrandedChat/WithSlashes/ForFun" });
 
         expect(exporter.destinationFileName).toMatchSnapshot();
     });
+
+    it("should export", async () => {
+        const room = new Room("!myroom:example.org", client, "@me:example.org");
+
+        const events = [...Array(50)].map<IRoomEvent>((_, i) => ({
+            event_id: "$1",
+            type: EventType.RoomMessage,
+            sender: `@user${i}:example.com`,
+            origin_server_ts: 5_000 + i * 1000,
+            content: {
+                msgtype: "m.text",
+                body: `Message #${i}`,
+            },
+        }));
+
+        client.getRoom.mockReturnValue(room);
+        client.createMessagesRequest.mockResolvedValue({ chunk: events });
+
+        const exporter = new HTMLExporter(
+            room,
+            ExportType.LastNMessages,
+            {
+                attachmentsIncluded: false,
+                maxSize: 1_024 * 1_024,
+                numberOfMessages: events.length,
+            },
+            () => {},
+        );
+
+        await exporter.export();
+
+        const file = getMessageFile(exporter);
+        expect(await file.text()).toMatchSnapshot();
+    });
 });