Base64UploadAdapter CKEditor5

uploadadapter.js

/**
 * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md.
 */

/* globals window */

/**
 * @module adapter-base64/uploadadapter
 */

import Plugin from '@ckeditor/ckeditor5-core/src/plugin';
import FileRepository from '@ckeditor/ckeditor5-upload/src/filerepository';

/**
 * @extends module:core/plugin~Plugin
 */
export default class Base64UploadAdapter extends Plugin {
	/**
	 * @inheritDoc
	 */
	static get requires() {
		return [ FileRepository ];
	}

	/**
	 * @inheritDoc
	 */
	static get pluginName() {
		return 'Base64UploadAdapter';
	}

	/**
	 * @inheritDoc
	 */
	init() {
		// Register Base64UploadAdapter
		this.editor.plugins.get( FileRepository ).createUploadAdapter = loader => new UploadAdapter( loader, this.editor.t );
	}
}

/**
 * Upload adapter for Base64.
 *
 * @private
 * @implements module:upload/filerepository~UploadAdapter
 */
class UploadAdapter {
	/**
	 * Creates a new adapter instance.
	 *
	 * @param {module:upload/filerepository~FileLoader} loader
	 * @param {module:utils/locale~Locale#t} t
	 */
	constructor( loader, t ) {
		/**
		 * FileLoader instance to use during the upload.
		 *
		 * @member {module:upload/filerepository~FileLoader} #loader
		 */
		this.loader = loader;

		/**
		 * Locale translation method.
		 *
		 * @member {module:utils/locale~Locale#t} #t
		 */
		this.t = t;
	}

	/**
	 * Starts the upload process.
	 *
	 * @see module:upload/filerepository~UploadAdapter#upload
	 * @returns {Promise}
	 */
	upload() {
		return new Promise( ( resolve, reject ) => {
			const reader = this.reader = new window.FileReader();

			reader.onload = function() {
				resolve( { default: reader.result } );
			};

			reader.onerror = function( error ) {
				reject( error );
			};

			reader.onabort = function() {
				reject();
			};

			reader.readAsDataURL( this.loader.file );
		} );
	}

	/**
	 * Aborts the upload process.
	 *
	 * @see module:upload/filerepository~UploadAdapter#abort
	 * @returns {Promise}
	 */
	abort() {
		if ( this.reader ) {
			this.reader.abort();
		}
	}
}