Flashcard step 8 (Event system)

App\EventSubscriber\UserSubscriber.php

<?php

namespace App\EventSubscriber;

use ApiPlatform\Core\EventListener\EventPriorities;
use App\Entity\User;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\Security\Core\Encoder\UserPasswordEncoderInterface;

class UserSubscriber implements EventSubscriberInterface
{
    private $passwordEncoder;

    public function __construct(UserPasswordEncoderInterface $passwordEncoder)
    {
        $this->passwordEncoder = $passwordEncoder;
    }

    public static function getSubscribedEvents()
    {
        return [
            KernelEvents::VIEW => ['encodePassword', EventPriorities::PRE_WRITE],
        ];
    }

    public function encodePassword(GetResponseForControllerResultEvent $event)
    {
        $user = $event->getControllerResult();

        if (!$user instanceof User || ($user instanceof User && $user->plainPassword === null)) {
            return;
        }

        $user->password = $this->passwordEncoder->encodePassword($user, $user->plainPassword);
        $user->eraseCredentials();
    }
}