<?php
/**
 * CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
 * Copyright (c) Cake Software Foundation, Inc. (https://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. (https://cakefoundation.org)
 * @link      https://cakephp.org CakePHP(tm) Project
 * @since     0.2.9
 * @license   https://opensource.org/licenses/mit-license.php MIT License
 */
namespace App\Controller;

use Cake\Controller\Controller;
use Cake\Event\Event;

/**
 * Application Controller
 *
 * Add your application-wide methods in the class below, your controllers
 * will inherit them.
 *
 * @link https://book.cakephp.org/3.0/en/controllers.html#the-app-controller
 */
class AppController extends Controller
{

    /**
     * Initialization hook method.
     *
     * Use this method to add common initialization code like loading components.
     *
     * e.g. `$this->loadComponent('Security');`
     *
     * @return void
     */
    public function initialize()
    {
        parent::initialize();

        $this->loadComponent('RequestHandler');
        $this->loadComponent('Flash');


        //ここから追加
        $this->loadComponent('Auth', [
            'authenticate' => [
                'Form' => [
                    'fields' => [
                        'username' => 'email',
                        'password' => 'password'
                    ],
                    'userModel' => 'Users'
                ]
            ],
            'authError' => 'You are not authorized to access that location.',
            'unauthorizedRedirect' => $this->referer(),
        ]);
        //ここまで追加
        

        /*
         * Enable the following components for recommended CakePHP security settings.
         * see https://book.cakephp.org/3.0/en/controllers/components/security.html
         */
        //$this->loadComponent('Security');
        //$this->loadComponent('Csrf');
    }


    //ここから追加
    public function beforeFilter(Event $event)
    {
        parent::beforeFilter($event);

        $controller = $this->request->getParam('controller');

        if ($controller == 'Companies') {
            $this->Auth->setConfig('authenticate', [
                'Form' => [
                    'userModel' => 'Companies',
                    'fields' => [
                        'username' => 'email',
                        'password' => 'password'
                    ]
                ]
            ]);

            $this->Auth->setConfig('loginAction', ['controller' => 'Companies', 'action' => 'login']);
        } elseif ($controller == 'Users') {
            $this->Auth->setConfig('authenticate', [
                'Form' => [
                    'userModel' => 'Users',
                    'fields' => [
                        'username' => 'email',
                        'password' => 'password'
                    ]
                ]
            ]);

            $this->Auth->setConfig('loginAction', ['controller' => 'Users', 'action' => 'login']);
        }
    }
    //ここまで追加
    
    
}

<?php
namespace App\Model\Entity;

use Cake\ORM\Entity;
use Cake\Auth\DefaultPasswordHasher;       //この行を追加

/**
 * Company Entity
 *
 * @property int $id
 * @property string $name
 * @property string $email
 * @property string $password
 * @property \Cake\I18n\FrozenTime $created
 * @property \Cake\I18n\FrozenTime $modified
 */
class Company extends Entity
{


    //ここから追加
    protected function _setPassword($password)
    {
        return (new DefaultPasswordHasher)->hash($password);
    }
    //ここまで追加

//コントローラー
public function login()
{
  if ($this->request->is('post')) {
    $user = $this->Auth->identify();
    if ($user) {
      $this->Auth->setUser($user);
      return $this->redirect(['action' => 'index']);
    }
    $this->Flash->error(__('Invalid username or password, try again'));
  }
}

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


//ビュー
<div class="form">
  <?= $this->Flash->render() ?>
  <h3>Login</h3>
  <?= $this->Form->create() ?>
  <fieldset>
    <legend><?= __('Please enter your username and password') ?></legend>
    <?= $this->Form->control('email', ['required' => true]) ?>
    <?= $this->Form->control('password', ['required' => true]) ?>
  </fieldset>
  <?= $this->Form->submit(__('Login')); ?>
  <?= $this->Form->end() ?>
</div>