How to Automate User Login After Registration in Symfony?

Programmatic User Authentication

Problem:

For streamlined user onboarding, it is desired to automate user login after registration, bypassing the login form.

Solution:

This is feasible through programmatic authentication.

Implementation:

To accomplish this within Symfony, the following steps can be implemented:

1. Initialize a new UsernamePasswordToken, providing the user, their password, the firewall name (e.g., "public" in your security.yml), and the user's roles.
2. Store the token in the security token storage.
3. Dispatch the "security.interactive_login" event to complete the login process.

Code Example:

<code class="php">use Symfony\Component\EventDispatcher\EventDispatcher,
    Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken,
    Symfony\Component\Security\Http\Event\InteractiveLoginEvent;

public function registerAction()
{
    // ...
    if ($this->get("request")->getMethod() == "POST") {
        // ... Password setting, etc.

        $em->persist($user);
        $em->flush();

        $token = new UsernamePasswordToken($user, $user->getPassword(), "public", $user->getRoles());

        $this->get("security.token_storage")->setToken($token);

        $event = new InteractiveLoginEvent($request, $token);
        $this->get("event_dispatcher")->dispatch("security.interactive_login", $event);

        // Redirect out if necessary
    }
}</code>

Note:

Remember to adjust the token type and role settings as needed to suit your specific use case.

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