julienj / twity

src/Security/FormAuthenticator.php

<?php

namespace App\Security;

use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\RouterInterface;
use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
use Symfony\Component\Security\Core\Encoder\UserPasswordEncoderInterface;
use Symfony\Component\Security\Core\Exception\AuthenticationException;
use Symfony\Component\Security\Core\Exception\CustomUserMessageAuthenticationException;
use Symfony\Component\Security\Core\Exception\InvalidCsrfTokenException;
use Symfony\Component\Security\Core\Security;
use Symfony\Component\Security\Core\User\UserInterface;
use Symfony\Component\Security\Core\User\UserProviderInterface;
use Symfony\Component\Security\Csrf\CsrfToken;
use Symfony\Component\Security\Csrf\CsrfTokenManagerInterface;
use Symfony\Component\Security\Guard\Authenticator\AbstractFormLoginAuthenticator;
use Symfony\Component\Security\Http\Util\TargetPathTrait;

class FormAuthenticator extends AbstractFormLoginAuthenticator
{
    use TargetPathTrait;

    private $router;
    private $csrfTokenManager;
    private $passwordEncoder;

    public function __construct(RouterInterface $router, CsrfTokenManagerInterface $csrfTokenManager, UserPasswordEncoderInterface $passwordEncoder)
    {
        $this->router = $router;
        $this->csrfTokenManager = $csrfTokenManager;
        $this->passwordEncoder = $passwordEncoder;
    }

    public function supports(Request $request)
    {
        return 'login' === $request->attributes->get('_route')
            && $request->isMethod('POST');
    }

    public function getCredentials(Request $request)
    {
        $credentials = [
            'username' => $request->request->get('username'),
            'password' => $request->request->get('password'),
            'csrf_token' => $request->request->get('_csrf_token'),
        ];
        $request->getSession()->set(
            Security::LAST_USERNAME,
            $credentials['username']
        );

        return $credentials;
    }

    public function getUser($credentials, UserProviderInterface $userProvider)
    {
        $token = new CsrfToken('authenticate', $credentials['csrf_token']);
        if (!$this->csrfTokenManager->isTokenValid($token)) {
            throw new InvalidCsrfTokenException();
        }

        // Load / create our user however you need.
        // You can do this by calling the user provider, or with custom logic here.
        $user = $userProvider->loadUserByUsername($credentials['username']);

        if (!$user) {

$user is of type Symfony\Component\Security\Core\User\UserInterface, thus it always evaluated to true.

            // fail authentication with a custom error
            throw new CustomUserMessageAuthenticationException('Username could not be found.');
        }

        return $user;
    }

    public function checkCredentials($credentials, UserInterface $user)
    {
        return $this->passwordEncoder->isPasswordValid($user, $credentials['password']);
    }

    public function onAuthenticationSuccess(Request $request, TokenInterface $token, $providerKey)
    {
        return new RedirectResponse($this->router->generate('home'));
    }

    public function start(Request $request, AuthenticationException $authException = null)
    {
        if ('json' === $request->getRequestFormat()) {
            return new JsonResponse(['error' => 401], Response::HTTP_UNAUTHORIZED);
        }

        return parent::start($request, $authException);
    }

    protected function getLoginUrl()
    {
        return $this->router->generate('login');
    }
}