Annotations :


use Symfony\Component\HttpFoundation\JsonResponse;
use FOS\UserBundle\Event\GetResponseUserEvent;
use FOS\UserBundle\FOSUserEvents;
use FOS\UserBundle\Event\FormEvent;
use Symfony\Component\Security\Core\Security;
use Symfony\Component\Security\Core\SecurityContextInterface;
use Symfony\Component\Security\Core\Exception\AuthenticationException;


Action :

public function loginAction(Request $request)
{
    $manager = $this->get('fos_user.user_manager');
    $factory = $this->get('security.encoder_factory');

    $email = $request->request->get('email');
    $password = $request->request->get('password');

    $em = $this->getDoctrine()->getManager();

    $bool = false;

    $response = [
        'status' => false
    ];

    $user = $manager->findUserByUsername($email);
    $encoder = $factory->getEncoder($user);
    $bool = ($encoder->isPasswordValid($user->getPassword(), $password, $user->getSalt())) ? true : false;

    if($bool) {
        $response = [
            'status' => true,
            'session' => [
                'id' => $user->getId(),
                'firstName' => $user->getFirstName(),
                'lastName' => $user->getLastName(),
            ],
        ];
    }

    return $response;
}