Support browser image transformations

packages/decap-cms-core/index.d.ts

@@ -60,6 +60,7 @@ declare module 'decap-cms-core' {
     i18n?: boolean | 'translate' | 'duplicate' | 'none';
     media_folder?: string;
     public_folder?: string;
+    media_processing?: CmsMediaProcessing;
     comment?: string;
   }
 
@@ -408,6 +409,21 @@ declare module 'decap-cms-core' {
     url?: string;
   }
 
+  export type CmsMediaProcessingFormat = 'jpeg' | 'webp';
+
+  export interface CmsMediaProcessing {
+    enabled: boolean;
+    format?: {
+      enabled: boolean;
+      default: CmsMediaProcessingFormat;
+    };
+    quality?: number;
+    strip_metadata?: boolean;
+    width?: number | null;
+    height?: number | null;
+    aspect_ratio?: number | string | null;
+  }
+
   export interface CmsConfig {
     backend: CmsBackend;
     collections: CmsCollection[];
@@ -423,6 +439,7 @@ declare module 'decap-cms-core' {
     media_folder?: string;
     public_folder?: string;
     media_folder_relative?: boolean;
+    media_processing?: CmsMediaProcessing;
     media_library?: CmsMediaLibrary;
     publish_mode?: CmsPublishMode;
     issue_reports?: CmsIssueReports;

packages/decap-cms-core/package.json

@@ -25,6 +25,7 @@
   "license": "MIT",
   "dependencies": {
     "@iarna/toml": "2.2.5",
+    "@jsquash/webp": "1.5.0",
     "@vercel/stega": "^0.1.2",
     "ajv": "^8.17.1",
     "ajv-errors": "^3.0.0",

packages/decap-cms-core/src/actions/__tests__/mediaLibrary.spec.js

@@ -6,6 +6,13 @@ import { insertMedia, persistMedia, deleteMedia } from '../mediaLibrary';
 
 jest.mock('../../backend');
 jest.mock('../waitUntil');
+jest.mock('../../lib/imageTransformations', () => {
+  const actual = jest.requireActual('../../lib/imageTransformations');
+  return {
+    ...actual,
+    transformImage: jest.fn(),
+  };
+});
 jest.mock('decap-cms-lib-util', () => {
   const lib = jest.requireActual('decap-cms-lib-util');
   return {
@@ -74,6 +81,7 @@ describe('mediaLibrary', () => {
 
     beforeEach(() => {
       jest.clearAllMocks();
+      window.confirm = jest.fn(() => true);
     });
 
     it('should not persist media when editing draft', () => {
@@ -146,7 +154,7 @@ describe('mediaLibrary', () => {
         }),
         integrations: Map(),
         mediaLibrary: Map({
-          files: List(),
+          files: List([{ name: 'kittens.jpg' }]),
         }),
         entryDraft: Map({
           entry: Map(),
@@ -239,6 +247,126 @@ describe('mediaLibrary', () => {
         );
       });
     });
+
+    it('should persist a processed image as the selected media', () => {
+      const { transformImage } = require('../../lib/imageTransformations');
+      backend.persistMedia.mockImplementation((_config, assetProxy) => ({
+        id: assetProxy.path,
+        path: assetProxy.path,
+      }));
+
+      const store = mockStore({
+        config: {
+          media_folder: 'static/media',
+          media_processing: {
+            enabled: true,
+            format: { enabled: true, default: 'webp' },
+            quality: 80,
+            strip_metadata: true,
+            width: 400,
+            height: null,
+            aspect_ratio: '16_9',
+          },
+          slug: {
+            encoding: 'unicode',
+            clean_accents: false,
+            sanitize_replacement: '-',
+          },
+        },
+        collections: Map({
+          posts: Map({ name: 'posts' }),
+        }),
+        integrations: Map(),
+        mediaLibrary: Map({
+          files: List(),
+        }),
+        entryDraft: Map({
+          entry: Map(),
+        }),
+      });
+
+      const file = new File(['original'], 'kittens.jpg', { type: 'image/jpeg' });
+      const processed = new File(['processed'], 'kittens.webp', { type: 'image/webp' });
+
+      transformImage.mockResolvedValue([{ file: processed, path: 'static/media/kittens.webp' }]);
+
+      return store.dispatch(persistMedia(file)).then(() => {
+        const actions = store.getActions();
+        const addAssetActions = actions.filter(action => action.type === 'ADD_ASSET');
+        const persistedActions = actions.filter(action => action.type === 'MEDIA_PERSIST_SUCCESS');
+
+        expect(transformImage).toHaveBeenCalledWith(file, 'static/media/kittens.jpg', {
+          format: 'webp',
+          quality: 0.8,
+          width: 400,
+          height: null,
+          aspectRatio: 16 / 9,
+        });
+        expect(addAssetActions.map(action => action.payload.path)).toEqual([
+          'static/media/kittens.webp',
+        ]);
+        expect(persistedActions.map(action => action.payload.file.path)).toEqual([
+          'static/media/kittens.webp',
+        ]);
+      });
+    });
+
+    it('should confirm before replacing the original output file when format conversion is disabled', () => {
+      const { transformImage } = require('../../lib/imageTransformations');
+      backend.persistMedia.mockImplementation((_config, assetProxy) => ({
+        id: assetProxy.path,
+        path: assetProxy.path,
+      }));
+
+      const store = mockStore({
+        config: {
+          media_folder: 'static/media',
+          media_processing: {
+            enabled: true,
+            format: { enabled: false, default: 'webp' },
+          },
+          slug: {
+            encoding: 'unicode',
+            clean_accents: false,
+            sanitize_replacement: '-',
+          },
+        },
+        collections: Map({
+          posts: Map({ name: 'posts' }),
+        }),
+        integrations: Map(),
+        mediaLibrary: Map({
+          files: List([{ name: 'kittens.jpg', path: 'static/media/kittens.jpg' }]),
+        }),
+        entryDraft: Map({
+          entry: Map(),
+        }),
+      });
+
+      const file = new File(['original'], 'kittens.jpg', { type: 'image/jpeg' });
+      const processed = new File(['processed'], 'kittens.jpg', { type: 'image/jpeg' });
+
+      transformImage.mockResolvedValue([{ file: processed, path: 'static/media/kittens.jpg' }]);
+
+      return store.dispatch(persistMedia(file)).then(() => {
+        const addAssetActions = store.getActions().filter(action => action.type === 'ADD_ASSET');
+
+        expect(transformImage).toHaveBeenCalledWith(file, 'static/media/kittens.jpg', {
+          format: undefined,
+          quality: undefined,
+          width: null,
+          height: null,
+          aspectRatio: null,
+        });
+        expect(addAssetActions.map(action => action.payload.path)).toEqual([
+          'static/media/kittens.jpg',
+        ]);
+        expect(window.confirm).toHaveBeenCalledWith(
+          'kittens.jpg already exists. Do you want to replace it?',
+        );
+        expect(backend.persistMedia).toHaveBeenCalledTimes(1);
+      });
+    });
   });
 
   describe('deleteMedia', () => {