CakePHP-3 Authentication

add.ctp

<!-- app/View/Users/add.ctp -->
<div class="users form">
<?= $this->Form->create($user) ?>
    <fieldset>
        <legend><?= __('Add User') ?></legend>
        <?= $this->Form->input('email') ?>
        <?= $this->Form->input('password') ?>
    </fieldset>
<?= $this->Form->button(__('Submit')); ?>
<?= $this->Form->end() ?>
</div>

AppController.php

<?php
/**
 * 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
 * @since         0.2.9
 * @license       http://www.opensource.org/licenses/mit-license.php MIT License
 */
namespace App\Controller;

use Cake\Controller\Controller;

/**
 * Application Controller
 *
 * Add your application-wide methods in the class below, your controllers
 * will inherit them.
 *
 * @link http://book.cakephp.org/3.0/en/controllers.html#the-app-controller
 */
class AppController extends Controller {
	public $components = [
        'Session',
        'Auth' => [
            'loginRedirect' => [
                'controller' => 'Articles',
                'action' => 'index'
            ],
            'logoutRedirect' => [
                'controller' => 'Pages',
                'action' => 'display',
                'home'
            ],
			'authenticate' => [
            'Form' => [
                'fields' => ['username' => 'email'],
				'passwordHasher' => [
                    'className' => 'Simple',
                ]
            ]
        ]
        ]
    ];

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

login.ctp

<div class="users form">
<?= $this->Session->flash('auth') ?>
<?= $this->Form->create() ?>
    <fieldset>
        <legend><?= __('Please enter your username and password') ?></legend>
        <?= $this->Form->input('email') ?>
        <?= $this->Form->input('password') ?>
    </fieldset>
<?= $this->Form->button(__('Login')); ?>
<?= $this->Form->end() ?>
</div>

User.php

<?php 
namespace App\Model\Entity;

use Cake\ORM\Entity;
use Cake\Auth\SimplePasswordHasher;

class User extends Entity {
    protected function _setPassword($password) {
        return (new SimplePasswordHasher)->hash($password);
    }

}
?>

UsersController.php

<?php 
// App/Controller/UsersController.php

namespace App\Controller;

use App\Controller\AppController;
use Cake\Error\NotFoundException;

class UsersController extends AppController {

    public function beforeFilter() {
		parent::beforeFilter();
		// Allow users to register and logout.
		$this->Auth->allow(['add', 'logout']);
	}

	public function login() {
		if ($this->request->is('post')) {
			if ($this->Auth->login()) {
				return $this->redirect($this->Auth->redirect());
			}
			$this->Session->setFlash(__('Invalid username or password, try again'));
		}
	}

	public function logout() {
		return $this->redirect($this->Auth->logout());
	}

     public function index() {
        $this->set('users', $this->Users->find('all'));
    }

    public function view($id) {
        if (!$id) {
            throw new NotFoundException(__('Invalid user'));
        }

        $user = $this->Users->get($id);
        $this->set(compact('user'));
    }

    public function add() {
        $user = $this->Users->newEntity($this->request->data);
        if ($this->request->is('post')) {
            if ($this->Users->save($user)) {
                $this->Session->setFlash(__('The user has been saved.'));
                return $this->redirect(['action' => 'index']);
            }
            $this->Session->setFlash(__('Unable to add the user.'));
        }
        $this->set('user', $user);
    }

}
?>

UsersTable.php

<?php
// App/Model/Table/UsersTable.php
namespace App\Model\Table;

use Cake\ORM\Table;

class UsersTable extends Table {

    public function validationDefault(Validator $validator) {
        return $validator
            ->notEmpty('email', 'A email is required')
            ->notEmpty('password', 'A password is required');
    }

}
?>