Existing App Controller

new_gist_file.php

<?php
/**
 * Application level Controller
 *
 * This file is application-wide controller file. You can put all
 * application-wide controller-related methods here.
 *
 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 *
 * Licensed under The MIT License
 * For full copyright and license information, please see the LICENSE.txt
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 * @link          http://cakephp.org CakePHP(tm) Project
 * @package       app.Controller
 * @since         CakePHP(tm) v 0.2.9
 * @license       http://www.opensource.org/licenses/mit-license.php MIT License
 */

App::uses('Controller', 'Controller');

/**
 * Application Controller
 *
 * Add your application-wide methods in the class below, your controllers
 * will inherit them.
 *
 * @package		app.Controller
 * @link		http://book.cakephp.org/2.0/en/controllers.html#the-app-controller
 */
class AppController extends Controller {
	public $components = array(
		'Auth',
		'Session',
		'RequestHandler',
		'Paginator',
		'Auth' => array(
            'authenticate' => array(
                'Form' => array(
					'fields' => array(
						'username' => 'username',
						'password' => 'password'
					),
					'userModel' => 'User',
                    'passwordHasher' => array(
						'className' => 'Simple',
						'hashType' => 'sha256'
					)
                )
            )
		)
	);

    public function beforeFilter()
    {
        $this->Auth->allow(['index', 'view', 'display']);
    }
}