php authentication cakephp jwt cakephp-3.x

How to use CakePHP3 "Authentication" Plugin with JWT

I have installed CakePhp 3.8 and i need use JWT authentication.

I have tryed installing and configuring CakePHP/Authentication (https://book.cakephp.org/authentication/1.1/en/index.html) but can not configure this.

My configuration:

PHP 7.2.19
MySQL 5.7.27
Apache 2.4.29
CakePHP 3.8
Authentication Plugin 1.1
firebase/php-jwt

I followed the guide configurations, and have add at AppController.php

// /src/Controller/Appcontroller.php
 public function initialize()
    {
        parent::initialize();
        $this->loadComponent('Authentication.Authentication', [
            'logoutRedirect' => '/administrators/login'  // Default is false
        ]);
....

In Application.php

// /src/application.php
class Application extends BaseApplication implements AuthenticationServiceProviderInterface

....

public function getAuthenticationService(ServerRequestInterface $request, ResponseInterface $response)
    {
        $service = new AuthenticationService();
        $service->loadIdentifier('Authentication.JwtSubject');
        $service->loadAuthenticator('Authentication.Jwt', [
            'returnPayload' => false
        ]);
        return $service;
    }

....

public function middleware($middlewareQueue)
    {
....

        // Add the authentication middleware
        $authentication = new AuthenticationMiddleware($this);

        // Add the middleware to the middleware queue
        $middlewareQueue->add($authentication);

        return $middlewareQueue;
    }

How i can login for first time and retrive JWT token?

-------------------EDIT-------------------

Thankyou, your solutions workly perfectly.

But now i have CORS problem with Angular FE GET request, befor GET this try one OPTIONS request whit CORS error.

I have this CORS policy in my AppController

        // Accepted all CORS
        $this->response = $this->response->cors($this->request)
            ->allowOrigin(['*'])
            ->allowMethods(['GET','POST','PUT','DELETE','OPTIONS','PATCH']) // edit this with more method
            ->allowHeaders(['X-CSRF-Token']) //csrf protection for cors
            ->allowCredentials()
            ->exposeHeaders(['Link'])
            ->maxAge(60)
            ->build();

Solution

You'd have to handle that on your own, ie create an endpoint that handles login requests, and upon successful authentication creates a JWT token containing the required identifier.

For username/password authentication for example you can use the Form authenticator and the Password identifier:

$service->loadIdentifier('Authentication.Password');
$service->loadIdentifier('Authentication.JwtSubject');

$service->loadAuthenticator('Authentication.Form', [
    'loginUrl' => '/users/login'
]);
$service->loadAuthenticator('Authentication.Jwt', [
    'returnPayload' => false
]);

With that example in UsersController create a login() action like this (that's just a very basic, hopefully self-explanatory example), check the authentication status, if valid generate a token, if invalid generate an error:

public function login()
{
    if ($this->Authentication->getResult()->isValid()) {
        $userId = $this->Authentication->getIdentityData('id');
        $token = \Firebase\JWT\JWT::encode(
            ['sub' => $userId],
            \Cake\Utility\Security::getSalt()
        );

        $status = 200;
        $response = [
            'token' => $token,
        ];
    } else {
        $status = 403;
        $response = [
            'error' => 'Authentication required',
        ];
    }

    return $this
        ->getResponse()
        ->withStatus($status)
        ->withType('json')
        ->withStringBody(json_encode($response));
}

It probably wouldn't hurt if the cookbook would have a complete example for token authentication.