<?php

namespace App\Security;

[.....]

/**
 * Class LoginFormAuthenticator
 */
class LoginFormAuthenticator extends AbstractFormLoginAuthenticator
{
    use TargetPathTrait;

    private $entityManager;
    private $urlGenerator;
    private $csrfTokenManager;
    private $passwordEncoder;
    /** @var Request $request */
    private $request
    public function __construct(EntityManagerInterface $entityManager, UrlGeneratorInterface $urlGenerator, CsrfTokenManagerInterface $csrfTokenManager, UserPasswordEncoderInterface $passwordEncoder, RequestStack $rs)
    {
        $this->entityManager = $entityManager;
        $this->urlGenerator = $urlGenerator;
        $this->csrfTokenManager = $csrfTokenManager;
        $this->passwordEncoder = $passwordEncoder;
        $this->request = $rs->getCurrentRequest();
    }

    [....]

    public function onAuthenticationSuccess(Request $request, TokenInterface $token, $providerKey)
    {
        if ($targetPath = $this->getTargetPath($request->getSession(), $providerKey)) {
            return new RedirectResponse($targetPath);
        }

        $url = $this->urlGenerator->generate('index');

        return new RedirectResponse($url);
    }

    protected function getLoginUrl()
    {
        return $this->urlGenerator->generate('app_login', [ array of parameters ]);
    }
}