How to Implement Automatic Post-Registration Login in Symfony Applications?

Automatic Post-Registration User Authentication in Symfony Applications

In Symfony applications, it's common to have a registration process where users create an account. To enhance the user experience, it's desirable to automatically log in the user after successful registration, eliminating the need for them to provide their credentials again.

Solution Methods

Depending on the version of Symfony used, the methods for achieving automatic login vary:

Symfony 4.0 and Later

use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use YourNameSpace\UserBundle\Entity\User;

class LoginController extends AbstractController
{
    public function registerAction()
    {
        $user = //Handle getting or creating the user entity likely with a posted form
        $token = new UsernamePasswordToken($user, null, 'main', $user->getRoles());
        $this->container->get('security.token_storage')->setToken($token);
        $this->container->get('session')->set('_security_main', serialize($token));
    }
}

Symfony 2.6.x - 3.0.x

use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use YourNameSpace\UserBundle\Entity\User;

class LoginController extends Controller
{
    public function registerAction()
    {
        $user = //Handle getting or creating the user entity likely with a posted form
        $token = new UsernamePasswordToken($user, null, 'main', $user->getRoles());
        $this->get('security.token_storage')->setToken($token);
        $this->get('session')->set('_security_main', serialize($token));
    }
}

Symfony 2.3.x

use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use YourNameSpace\UserBundle\Entity\User;

class LoginController extends Controller
{
    public function registerAction()
    {
        $user = //Handle getting or creating the user entity likely with a posted form
        $token = new UsernamePasswordToken($user, null, 'main', $user->getRoles());
        $this->get('security.context')->setToken($token);
        $this->get('session')->set('_security_main',serialize($token));
    }
}

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