Download the emoji database only once and make it available for other editors

packages/ckeditor5-emoji/src/emojiconfig.ts

@@ -80,7 +80,9 @@ export interface EmojiConfig {
 	 *
 	 * @default 16
 	 */
-	version?: 15 | 16;
+	version?: EmojiVersion;
 }
 
 export type SkinToneId = 'default' | 'light' | 'medium-light' | 'medium' | 'medium-dark' | 'dark';
+
+export type EmojiVersion = 15 | 16;

packages/ckeditor5-emoji/src/emojirepository.ts

@@ -11,40 +11,40 @@ import Fuse from 'fuse.js';
 import { groupBy } from 'lodash-es';
 
 import { type Editor, Plugin } from 'ckeditor5/src/core.js';
-import { logWarning } from 'ckeditor5/src/utils.js';
+import { logWarning, version } from 'ckeditor5/src/utils.js';
 import EmojiUtils from './emojiutils.js';
-import type { SkinToneId } from './emojiconfig.js';
+import type { EmojiVersion, SkinToneId } from './emojiconfig.js';
 
-// An endpoint from which the emoji database will be downloaded during plugin initialization.
+// An endpoint from which the emoji data will be downloaded during plugin initialization.
 // The `{version}` placeholder is replaced with the value from editor config.
 const EMOJI_DATABASE_URL = 'https://cdn.ckeditor.com/ckeditor5/data/emoji/{version}/en.json';
 
 /**
  * The emoji repository plugin.
  *
- * Loads the emoji database from URL during plugin initialization and provides utility methods to search it.
+ * Loads the emoji repository from URL during plugin initialization and provides utility methods to search it.
  */
 export default class EmojiRepository extends Plugin {
 	/**
-	 * A callback to resolve the {@link #_databasePromise} to control the return value of this promise.
+	 * A callback to resolve the {@link #_repositoryPromise} to control the return value of this promise.
 	 */
-	declare private _databasePromiseResolveCallback: ( value: boolean ) => void;
+	declare private _repositoryPromiseResolveCallback: ( value: boolean ) => void;
 
 	/**
 	 * An instance of the [Fuse.js](https://www.fusejs.io/) library.
 	 */
 	private _fuseSearch: Fuse<EmojiEntry> | null;
 
 	/**
-	 * Emoji database.
+	 * The emoji version that is used to prepare the emoji repository.
 	 */
-	private _database: Array<EmojiEntry>;
+	private readonly _version: EmojiVersion;
 
 	/**
-	 * A promise resolved after downloading the emoji database.
-	 * The promise resolves with `true` when the database is successfully downloaded or `false` otherwise.
+	 * A promise resolved after downloading the emoji collection.
+	 * The promise resolves with `true` when the repository is successfully downloaded or `false` otherwise.
 	 */
-	private readonly _databasePromise: Promise<boolean>;
+	private readonly _repositoryPromise: Promise<boolean>;
 
 	/**
 	 * @inheritDoc
@@ -73,14 +73,15 @@ export default class EmojiRepository extends Plugin {
 	constructor( editor: Editor ) {
 		super( editor );
 
-		this.editor.config.define( 'emoji', {
+		editor.config.define( 'emoji', {
 			version: 16,
 			skinTone: 'default'
 		} );
 
-		this._database = [];
-		this._databasePromise = new Promise<boolean>( resolve => {
-			this._databasePromiseResolveCallback = resolve;
+		this._version = editor.config.get( 'emoji.version' )!;
+
+		this._repositoryPromise = new Promise<boolean>( resolve => {
+			this._repositoryPromiseResolveCallback = resolve;
 		} );
 
 		this._fuseSearch = null;
@@ -90,32 +91,22 @@ export default class EmojiRepository extends Plugin {
 	 * @inheritDoc
 	 */
 	public async init(): Promise<void> {
-		const emojiUtils = this.editor.plugins.get( 'EmojiUtils' );
-		const emojiVersion = this.editor.config.get( 'emoji.version' )!;
-
-		const emojiDatabaseUrl = EMOJI_DATABASE_URL.replace( '{version}', `${ emojiVersion }` );
-		const emojiDatabase = await loadEmojiDatabase( emojiDatabaseUrl );
-		const emojiSupportedVersionByOs = emojiUtils.getEmojiSupportedVersionByOs();
+		if ( !( this._version in EmojiRepository._results ) ) {
+			const cdnResult = await this._loadItemsFromCdn();
 
-		// Skip the initialization if the emoji database download has failed.
-		// An empty database prevents the initialization of other dependent plugins, such as `EmojiMention` and `EmojiPicker`.
-		if ( !emojiDatabase.length ) {
-			return this._databasePromiseResolveCallback( false );
+			EmojiRepository._results[ this._version ] = this._normalizeEmoji( cdnResult );
 		}
 
-		const container = emojiUtils.createEmojiWidthTestingContainer();
-		document.body.appendChild( container );
-
-		// Store the emoji database after normalizing the raw data.
-		this._database = emojiDatabase
-			.filter( item => emojiUtils.isEmojiCategoryAllowed( item ) )
-			.filter( item => emojiUtils.isEmojiSupported( item, emojiSupportedVersionByOs, container ) )
-			.map( item => emojiUtils.normalizeEmojiSkinTone( item ) );
+		const items = this._getItems();
 
-		container.remove();
+		// Skip plugin initialization if the emoji repository is not available.
+		// The initialization of other dependent plugins, such as `EmojiMention` and `EmojiPicker`, is prevented as well.
+		if ( !items ) {
+			return this._repositoryPromiseResolveCallback( false );
+		}
 
 		// Create instance of the Fuse.js library with configured weighted search keys and disabled fuzzy search.
-		this._fuseSearch = new Fuse( this._database, {
+		this._fuseSearch = new Fuse( items, {
 			keys: [
 				{ name: 'emoticon', weight: 5 },
 				{ name: 'annotation', weight: 3 },
@@ -126,12 +117,12 @@ export default class EmojiRepository extends Plugin {
 			ignoreLocation: true
 		} );
 
-		return this._databasePromiseResolveCallback( true );
+		return this._repositoryPromiseResolveCallback( true );
 	}
 
 	/**
 	 * Returns an array of emoji entries that match the search query.
-	 * If the emoji database is not loaded, the [Fuse.js](https://www.fusejs.io/) instance is not created,
+	 * If the emoji repository is not loaded, the [Fuse.js](https://www.fusejs.io/) instance is not created,
 	 * hence this method returns an empty array.
 	 *
 	 * @param searchQuery A search query to match emoji.
@@ -170,12 +161,14 @@ export default class EmojiRepository extends Plugin {
 
 	/**
 	 * Groups all emojis by categories.
-	 * If the emoji database is not loaded, it returns an empty array.
+	 * If the emoji repository is not loaded, it returns an empty array.
 	 *
 	 * @returns An array of emoji entries grouped by categories.
 	 */
 	public getEmojiCategories(): Array<EmojiCategory> {
-		if ( !this._database.length ) {
+		const repository = this._getItems();
+
+		if ( !repository ) {
 			return [];
 		}
 
@@ -193,7 +186,7 @@ export default class EmojiRepository extends Plugin {
 			{ title: t( 'Flags' ), icon: '🏁', groupId: 9 }
 		];
 
-		const groups = groupBy( this._database, 'group' );
+		const groups = groupBy( repository, 'group' );
 
 		return categories.map( category => {
 			return {
@@ -220,43 +213,86 @@ export default class EmojiRepository extends Plugin {
 	}
 
 	/**
-	 * Indicates whether the emoji database has been successfully downloaded and the plugin is operational.
+	 * Indicates whether the emoji repository has been successfully downloaded and the plugin is operational.
 	 */
 	public isReady(): Promise<boolean> {
-		return this._databasePromise;
+		return this._repositoryPromise;
 	}
-}
 
-/**
- * Makes the HTTP request to download the emoji database.
- */
-async function loadEmojiDatabase( emojiDatabaseUrl: string ): Promise<Array<EmojiCdnResource>> {
-	const result = await fetch( emojiDatabaseUrl )
-		.then( response => {
-			if ( !response.ok ) {
+	/**
+	 * Returns the emoji repository in a configured version if it is a non-empty array. Returns `null` otherwise.
+	 */
+	private _getItems(): Array<EmojiEntry> | null {
+		const repository = EmojiRepository._results[ this._version ];
+
+		return repository && repository.length ? repository : null;
+	}
+
+	/**
+	 * Makes the HTTP request to download the emoji repository in a configured version.
+	 */
+	private async _loadItemsFromCdn(): Promise<Array<EmojiCdnResource>> {
+		const repositoryUrl = new URL( EMOJI_DATABASE_URL.replace( '{version}', `${ this._version }` ) );
+
+		repositoryUrl.searchParams.set( 'editorVersion', version );
+
+		const result: Array<EmojiCdnResource> = await fetch( repositoryUrl )
+			.then( response => {
+				if ( !response.ok ) {
+					return [];
+				}
+
+				return response.json();
+			} )
+			.catch( () => {
 				return [];
-			}
+			} );
+
+		if ( !result.length ) {
+			/**
+			 * Unable to load the emoji repository from CDN.
+			 *
+			 * If the CDN works properly and there is no disruption of communication, please check your
+			 * {@glink getting-started/setup/csp Content Security Policy (CSP)} setting and make sure
+			 * the CDN connection is allowed by the editor.
+			 *
+			 * @error emoji-repository-load-failed
+			 */
+			logWarning( 'emoji-repository-load-failed' );
+		}
 
-			return response.json();
-		} )
-		.catch( () => {
-			return [];
-		} );
+		return result;
+	}
+
+	/**
+	 * Normalizes the raw data fetched from CDN. By normalization, we meant:
+	 *
+	 *  * Filter out unsupported emoji (these that will not render correctly),
+	 *  * Prepare skin tone variants if an emoji defines them.
+	 */
+	private _normalizeEmoji( data: Array<EmojiCdnResource> ): Array<EmojiEntry> {
+		const emojiUtils = this.editor.plugins.get( 'EmojiUtils' );
+		const emojiSupportedVersionByOs = emojiUtils.getEmojiSupportedVersionByOs();
+
+		const container = emojiUtils.createEmojiWidthTestingContainer();
+		document.body.appendChild( container );
+
+		const results = data
+			.filter( item => emojiUtils.isEmojiCategoryAllowed( item ) )
+			.filter( item => emojiUtils.isEmojiSupported( item, emojiSupportedVersionByOs, container ) )
+			.map( item => emojiUtils.normalizeEmojiSkinTone( item ) );
+
+		container.remove();
 
-	if ( !result.length ) {
-		/**
-		 * Unable to load the emoji database from CDN.
-		 *
-		 * If the CDN works properly and there is no disruption of communication, please check your
-		 * {@glink getting-started/setup/csp Content Security Policy (CSP)} setting and make sure
-		 * the CDN connection is allowed by the editor.
-		 *
-		 * @error emoji-database-load-failed
-		 */
-		logWarning( 'emoji-database-load-failed' );
+		return results;
 	}
 
-	return result;
+	/**
+	 * Versioned emoji repository.
+	 */
+	private static _results: {
+		[ key in EmojiVersion ]?: Array<EmojiEntry>
+	} = {};
 }
 
 /**

packages/ckeditor5-emoji/src/utils/isemojisupported.ts

@@ -73,7 +73,7 @@ export default function isEmojiSupported( unicode: string ): boolean {
 
 function getCanvas(): CanvasRenderingContext2D | null {
 	try {
-		return document.createElement( 'canvas' ).getContext( '2d' );
+		return document.createElement( 'canvas' ).getContext( '2d', { willReadFrequently: true } );
 	} catch {
 		/* istanbul ignore next -- @preserve */
 		return null;

packages/ckeditor5-emoji/tests/emojimention.js

@@ -615,7 +615,7 @@ describe( 'EmojiMention', () => {
 			expect( queryEmoji( ' see' ) ).to.deep.equal( [] );
 		} );
 
-		it( 'should return an empty array when the repository plugin is not loaded correctly', async () => {
+		it( 'should return an empty array when the repository plugin is not available', async () => {
 			testUtils.sinon.stub( console, 'warn' );
 			fetchStub.rejects( 'Failed to load CDN.' );
 
@@ -626,6 +626,8 @@ describe( 'EmojiMention', () => {
 				plugins: [ EmojiMention, Paragraph, Essentials, Mention ]
 			} );
 
+			editor.plugins.get( 'EmojiMention' )._isEmojiRepositoryAvailable = false;
+
 			const queryEmoji = editor.plugins.get( 'EmojiMention' )._queryEmojiCallbackFactory();
 
 			expect( queryEmoji( '' ) ).to.deep.equal( [] );

packages/ckeditor5-emoji/tests/emojipicker.js

@@ -53,6 +53,8 @@ describe( 'EmojiPicker', () => {
 	let editor, editorElement, emojiPicker, fetchStub;
 
 	beforeEach( async () => {
+		EmojiRepository._results = {};
+
 		editorElement = document.createElement( 'div' );
 		document.body.appendChild( editorElement );
 
@@ -129,6 +131,9 @@ describe( 'EmojiPicker', () => {
 			const editorElement = document.createElement( 'div' );
 			document.body.appendChild( editorElement );
 
+			// As the data are shored between editors creation, let's manually clear it before creating a new editor.
+			EmojiRepository._results = {};
+
 			const editor = await ClassicTestEditor.create( editorElement, {
 				plugins: [ EmojiPicker, Essentials, Paragraph ],
 				emoji: {
@@ -148,6 +153,9 @@ describe( 'EmojiPicker', () => {
 			const editorElement = document.createElement( 'div' );
 			document.body.appendChild( editorElement );
 
+			// As the data are shored between editors creation, let's manually clear it before creating a new editor.
+			EmojiRepository._results = {};
+
 			const editor = await ClassicTestEditor.create( editorElement, {
 				plugins: [ EmojiPicker, Essentials, Paragraph ],
 				emoji: {
@@ -197,6 +205,9 @@ describe( 'EmojiPicker', () => {
 				testUtils.sinon.stub( console, 'warn' );
 				fetchStub.rejects( 'Failed to load CDN.' );
 
+				// As the data are shored between editors creation, let's manually clear it before creating a new editor.
+				EmojiRepository._results = {};
+
 				const editor = await ClassicTestEditor.create( editorElement, {
 					plugins: [ EmojiPicker, Paragraph, Essentials ]
 				} );
@@ -234,6 +245,9 @@ describe( 'EmojiPicker', () => {
 				testUtils.sinon.stub( console, 'warn' );
 				fetchStub.rejects( 'Failed to load CDN.' );
 
+				// As the data are shored between editors creation, let's manually clear it before creating a new editor.
+				EmojiRepository._results = {};
+
 				const editor = await ClassicTestEditor.create( editorElement, {
 					plugins: [ EmojiPicker, Paragraph, Essentials ]
 				} );