Services - CakePHP

Authentication

Authentication is the process of identifying the correct user. CakePHP supports three types of authentication.

• FormAuthenticate - It allows you to authenticate users based on form POST data. Usually this is a login form that users enter information into. This is default authentication method.

• BasicAuthenticate - It allows you to authenticate users using Basic HTTP authentication.

• DigestAuthenticate - It allows you to authenticate users using Digest HTTP authentication.

Example for FormAuthentication

Make changes in the config/routes.php file as shown in the following code.

config/routes.php

<?php
   use Cake\Core\Plugin;
   use Cake\Routing\RouteBuilder;
   use Cake\Routing\Router;

   Router::defaultRouteClass('DashedRoute');
   Router::scope('/', function (RouteBuilder $routes) {
      $routes->connect('/auth',['controller'=>'Authexs','action'=>'index']);
      $routes->connect('/login',['controller'=>'Authexs','action'=>'login']);
      $routes->connect('/logout',['controller'=>'Authexs','action'=>'logout']);
      $routes->fallbacks('DashedRoute');
   });
   Plugin::routes();

Change the code of AppController.php file as shown in the following program.

src/Controller/AppController.php

<?php
   namespace App\Controller;
   use Cake\Controller\Controller;
   use Cake\Event\Event;
   use Cake\Controller\Component\AuthComponent;

   class AppController extends Controller{
      public function initialize(){
         parent::initialize();
         
         $this->loadComponent('RequestHandler');
         $this->loadComponent('Flash');
         $this->loadComponent('Auth', [
            'authenticate' => [
               'Form' => [
                  'fields' => ['username' => 'username', 'password' => 'password']
               ]
            ],
            'loginAction' => ['controller' => 'Authexs', 'action' => 'login'],
            'loginRedirect' => ['controller' => 'Authexs', 'action' => 'index'],
            'logoutRedirect' => ['controller' => 'Authexs', 'action' => 'login']
         ]);
      
         $this->Auth->config('authenticate', [
            AuthComponent::ALL => ['userModel' => 'users'], 'Form']);
      }
   
      public function beforeRender(Event $event){
         if (!array_key_exists('_serialize', $this=>viewVars) &&
         in_array($this->response=>type(), ['application/json', 'application/xml'])) {
            $this->set('_serialize', true);
         }
      }
   }

Create AuthexsController.php file at src/Controller/AuthexsController.php. Copy the following code in the controller file.

src/Controller/AuthexsController.php

<?php
   namespace App\Controller;
   use App\Controller\AppController;
   use Cake\ORM\TableRegistry;
   use Cake\Datasource\ConnectionManager;
   use Cake\Event\Event;
   use Cake\Auth\DefaultPasswordHasher;

   class AuthexsController extends AppController{
      var $components = array('Auth');
      public function index(){
      }
      public function login(){
         if($this->request->is('post')){
            $user = $this->Auth->identify();
            
            if($user){
               $this->Auth->setUser($user);
               return $this->redirect($this->Auth->redirectUrl());
            } else
            $this->Flash->error('Your username or password is incorrect.');
         }
      }
      public function logout(){
         return $this->redirect($this->Auth->logout());
      }
   }
?>

Create a directory Authexs at src/Template and under that directory create a View file called login.ctp. Copy the following code in that file.

src/Template/Authexs/login.ctp

<?php
   echo $this->Form->create();
   echo $this->Form->input('username');
   echo $this->Form->input('password');
   echo $this->Form->button('Submit');
   echo $this->Form->end();
?>

Create another View file called logout.ctp. Copy the following code in that file.

src/Template/Authexs/logout.ctp

You are successfully loggedout.

Create another View file called index.ctp. Copy the following code in that file.

src/Template/Authexs/index.ctp

You are successfully logged in. 
<?php echo 
   $this->Html->link('logout',["controller" => "Authexs","action" => "logout"]); 
?>

Execute the above example by visiting the following URL.

http://localhost:85/CakePHP/auth

Output

As the authentication has been implemented so once you try to visit the above URL, you will be redirected to the login page as shown below.