Implement the download_file widget action

Signed-off-by: Michael Weimann <michael.weimann@nordeck.net>

.changeset/sweet-jeans-smile.md

@@ -0,0 +1,5 @@
+---
+'@matrix-widget-toolkit/api': minor
+---
+
+Add support for the download_file widget action

example-widget-mui/README.md

@@ -17,7 +17,7 @@ The widget demonstrates:
 - How to read related events ([`Event Relations`](./src/RelationsPage/RelationsPage.tsx)).
 - How to search the User Directory ([`User Directory and Invitations`](./src/InvitationsPage/InvitationsPage.tsx)).
 - How to use the UI components to match the style of Element ([`Theme`](./src/ThemePage/ThemePage.tsx)).
-- How to upload files to the media repository ([`Upload File`](./src/UploadImagePage/UploadImagePage.tsx)).
+- How to upload and download files to the media repository ([`Up- and download image`](./src/ImagePage/ImagePage.tsx)).
 
 ## Demo
 

example-widget-mui/src/App/App.tsx

@@ -24,14 +24,14 @@ import { BrowserRouter, Route, Routes } from 'react-router-dom';
 import { AllRoomsPage } from '../AllRoomsPage';
 import { DicePage } from '../DicePage';
 import { IdentityPage } from '../IdentityPage';
+import { ImagePage } from '../ImagePage';
 import { InvitationsPage } from '../InvitationsPage';
 import { ModalDialog, ModalPage } from '../ModalPage';
 import { NavigationPage } from '../NavigationPage';
 import { PowerLevelsPage } from '../PowerLevelsPage';
 import { RelationsPage } from '../RelationsPage';
 import { RoomPage } from '../RoomPage';
 import { ThemePage } from '../ThemePage';
-import { UploadImagePage } from '../UploadImagePage';
 import { WelcomePage } from '../WelcomePage';
 
 export function App({
@@ -65,7 +65,7 @@ export function App({
               <Route path="/relations" element={<RelationsPage />} />
               <Route path="/invitations" element={<InvitationsPage />} />
               <Route path="/theme" element={<ThemePage />} />
-              <Route path="/uploadImage" element={<UploadImagePage />} />
+              <Route path="/image" element={<ImagePage />} />
             </Routes>
           </MuiWidgetApiProvider>
         </Suspense>

example-widget-mui/src/ImagePage/Image.tsx

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2024 Nordeck IT + Consulting GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { useWidgetApi } from '@matrix-widget-toolkit/react';
+import React, { useCallback, useEffect, useState } from 'react';
+
+type ImageProps = {
+  alt?: string;
+  /**
+   * MXC URI of the image that should be shown
+   */
+  contentUrl: string;
+};
+
+/**
+ * Component that loads the image from the content repository and displays it.
+ */
+export const Image: React.FC<ImageProps> = function ({
+  contentUrl,
+  ...imageProps
+}) {
+  const [dataUrl, setDataUrl] = useState<string>();
+  const widgetApi = useWidgetApi();
+
+  const handleLoad = useCallback(() => {
+    if (dataUrl) {
+      URL.revokeObjectURL(dataUrl);
+    }
+  }, [dataUrl]);
+
+  useEffect(() => {
+    (async () => {
+      try {
+        const result = await widgetApi.downloadFile(contentUrl);
+
+        if (!(result.file instanceof Blob)) {
+          throw new Error('Got non Blob file response');
+        }
+
+        const downloadedFileDataUrl = URL.createObjectURL(result.file);
+        setDataUrl(downloadedFileDataUrl);
+      } catch (error) {
+        console.log('Error downloading file', error);
+      }
+    })();
+  }, [contentUrl]);
+
+  if (dataUrl === undefined) {
+    return null;
+  }
+
+  return <img {...imageProps} src={dataUrl} onLoad={handleLoad} />;
+};

example-widget-mui/src/UploadImagePage/ImageListView.tsx → example-widget-mui/src/ImagePage/ImageListView.tsx

@@ -33,6 +33,7 @@ import {
   UploadedImageEvent,
   isValidUploadedImage,
 } from '../events';
+import { Image } from './Image';
 
 export const ImageListView = (): ReactElement => {
   const widgetApi = useWidgetApi();
@@ -75,13 +76,9 @@ export const ImageListView = (): ReactElement => {
             {imageNames.length > 0 &&
               imageNames.map((image) => (
                 <ImageListItem key={image.event_id}>
-                  <img
-                    src={`${getHttpUriForMxc(
-                      image.content.url,
-                      widgetApi.widgetParameters.baseUrl,
-                    )}?w=164&h=164&fit=crop&auto=format`}
+                  <Image
                     alt={image.content.name}
-                    loading="lazy"
+                    contentUrl={image.content.url}
                   />
                   <ImageListItemBar
                     title={image.content.name}

example-widget-mui/src/UploadImagePage/UploadImagePage.test.tsx → example-widget-mui/src/ImagePage/ImagePage.test.tsx

@@ -27,7 +27,7 @@ import { ComponentType, PropsWithChildren, act } from 'react';
 import { MemoryRouter } from 'react-router-dom';
 import { ROOM_EVENT_UPLOADED_IMAGE } from '../events';
 import { StoreProvider } from '../store';
-import { UploadImagePage } from './UploadImagePage';
+import { ImagePage } from './ImagePage';
 
 let widgetApi: MockedWidgetApi;
 let wrapper: ComponentType<PropsWithChildren<{}>>;
@@ -46,9 +46,9 @@ beforeEach(() => {
   );
 });
 
-describe('<UploadImagePage>', () => {
+describe('<ImagePage>', () => {
   it('should render without exploding', async () => {
-    render(<UploadImagePage />, { wrapper });
+    render(<ImagePage />, { wrapper });
 
     expect(
       screen.getByRole('link', { name: /back to navigation/i }),
@@ -66,7 +66,7 @@ describe('<UploadImagePage>', () => {
   });
 
   it('should have no accessibility violations', async () => {
-    const { container } = render(<UploadImagePage />, { wrapper });
+    const { container } = render(<ImagePage />, { wrapper });
 
     expect(
       screen.getByRole('heading', { name: /upload file/i }),
@@ -83,7 +83,7 @@ describe('<UploadImagePage>', () => {
   });
 
   it('should request the capabilities', async () => {
-    render(<UploadImagePage />, { wrapper });
+    render(<ImagePage />, { wrapper });
 
     expect(widgetApi.requestCapabilities).toHaveBeenCalledWith([
       WidgetEventCapability.forRoomEvent(
@@ -104,7 +104,7 @@ describe('<UploadImagePage>', () => {
   });
 
   it('should say that no images are loaded yet', async () => {
-    render(<UploadImagePage />, { wrapper });
+    render(<ImagePage />, { wrapper });
 
     await expect(
       screen.findByText(/no images uploaded to this room yet/i),
@@ -118,7 +118,7 @@ describe('<UploadImagePage>', () => {
       url: 'http://example.com/image.png',
     });
 
-    render(<UploadImagePage />, { wrapper });
+    render(<ImagePage />, { wrapper });
 
     await expect(
       screen.findByRole('img', { name: /image.png/i }),

example-widget-mui/src/UploadImagePage/UploadImagePage.tsx → example-widget-mui/src/ImagePage/ImagePage.tsx

@@ -49,7 +49,7 @@ import { ROOM_EVENT_UPLOADED_IMAGE, UploadedImageEvent } from '../events';
 /**
  * A component that showcases how to upload image files and render them in a widget.
  */
-export const UploadImagePage = (): ReactElement => {
+export const ImagePage = (): ReactElement => {
   const widgetApi = useWidgetApi();
   const [errorDialogOpen, setErrorDialogOpen] = useState<boolean>(false);
   const [selectedFile, setSelectedFile] = useState<File | null>(null);
@@ -137,10 +137,11 @@ export const UploadImagePage = (): ReactElement => {
               ROOM_EVENT_UPLOADED_IMAGE,
             ),
             WidgetApiFromWidgetAction.MSC4039UploadFileAction,
+            WidgetApiFromWidgetAction.MSC4039DownloadFileAction,
             WidgetApiFromWidgetAction.MSC4039GetMediaConfigAction,
           ]}
         >
-          {/* 
+          {/*
           The StoreProvider is located here to keep the example small. Normal
           applications would locate it outside of the router to establish a
           single, global store.

example-widget-mui/src/UploadImagePage/index.ts → example-widget-mui/src/ImagePage/index.ts

@@ -14,4 +14,4 @@
  * limitations under the License.
  */
 
-export { UploadImagePage } from './UploadImagePage';
+export { ImagePage } from './ImagePage';

example-widget-mui/src/NavigationPage/NavigationPage.tsx

@@ -110,9 +110,9 @@ export const NavigationPage = (): ReactElement => {
           design of Element"
         />
         <NavigationItem
-          to="/uploadImage"
-          title="Upload File"
-          description="Example for uploading an image file"
+          to="/image"
+          title="Up- and download image"
+          description="Example for up- and downloading an image file"
         />
       </List>
     </Box>

packages/api/api-report.api.md

@@ -5,6 +5,7 @@
 ```ts
 
 import { Capability } from 'matrix-widget-api';
+import { IDownloadFileActionFromWidgetResponseData } from 'matrix-widget-api';
 import { IGetMediaConfigActionFromWidgetResponseData } from 'matrix-widget-api';
 import { IModalWidgetCreateData } from 'matrix-widget-api';
 import { IModalWidgetOpenRequestDataButton } from 'matrix-widget-api';
@@ -271,6 +272,7 @@ export type WidgetApi = {
     }>;
     getMediaConfig(): Promise<IGetMediaConfigActionFromWidgetResponseData>;
     uploadFile(file: XMLHttpRequestBodyInit): Promise<IUploadFileActionFromWidgetResponseData>;
+    downloadFile(contentUrl: string): Promise<IDownloadFileActionFromWidgetResponseData>;
 };
 
 // @public
@@ -281,6 +283,7 @@ export class WidgetApiImpl implements WidgetApi {
     widgetParameters: WidgetParameters, { capabilities, supportStandalone }?: WidgetApiOptions);
     closeModal<T extends IModalWidgetReturnData>(data?: T): Promise<void>;
     static create({ capabilities, supportStandalone, }?: WidgetApiOptions): Promise<WidgetApi>;
+    downloadFile(contentUrl: string): Promise<IDownloadFileActionFromWidgetResponseData>;
     getMediaConfig(): Promise<IGetMediaConfigActionFromWidgetResponseData>;
     getWidgetConfig<T extends IWidgetApiRequestData>(): Readonly<WidgetConfig<T> | undefined>;
     hasCapabilities(capabilities: Array<WidgetEventCapability | Capability>): boolean;

packages/api/src/api/WidgetApiImpl.ts

@@ -16,6 +16,7 @@
 
 import {
   Capability,
+  IDownloadFileActionFromWidgetResponseData,
   IGetMediaConfigActionFromWidgetResponseData,
   IModalWidgetCreateData,
   IModalWidgetOpenRequestDataButton,
@@ -799,4 +800,11 @@ export class WidgetApiImpl implements WidgetApi {
   ): Promise<IUploadFileActionFromWidgetResponseData> {
     return await this.matrixWidgetApi.uploadFile(file);
   }
+
+  /** {@inheritdoc WidgetApi.downloadFile}  */
+  async downloadFile(
+    contentUrl: string,
+  ): Promise<IDownloadFileActionFromWidgetResponseData> {
+    return await this.matrixWidgetApi.downloadFile(contentUrl);
+  }
 }

packages/api/src/api/types.ts

@@ -16,6 +16,7 @@
 
 import {
   Capability,
+  IDownloadFileActionFromWidgetResponseData,
   IGetMediaConfigActionFromWidgetResponseData,
   IModalWidgetCreateData,
   IModalWidgetOpenRequestDataButton,
@@ -561,5 +562,14 @@ export type WidgetApi = {
     file: XMLHttpRequestBodyInit,
   ): Promise<IUploadFileActionFromWidgetResponseData>;
 
+  /**
+   * Download a file to the media repository on the homeserver.
+   * @param contentUrl - MXC URI of the file to download
+   * @returns resolves to an object with: file - the file contents
+   */
+  downloadFile(
+    contentUrl: string,
+  ): Promise<IDownloadFileActionFromWidgetResponseData>;
+
   // TODO: sendSticker, setAlwaysOnScreen
 };

packages/testing/src/api/mockWidgetApi.ts

@@ -235,6 +235,7 @@ export function mockWidgetApi(opts?: {
     uploadFile: jest.fn().mockResolvedValue({
       content_uri: 'mxc://...',
     }),
+    downloadFile: jest.fn(),
   };
 
   widgetApi.receiveRoomEvents.mockImplementation(async (type, options) => {