app/bundles/UserBundle/Model/UserToken/UserTokenService.php

<?php

namespace Mautic\UserBundle\Model\UserToken;

use Mautic\CoreBundle\Helper\RandomHelper\RandomHelperInterface;
use Mautic\UserBundle\Entity\UserToken;
use Mautic\UserBundle\Entity\UserTokenRepositoryInterface;

final class UserTokenService implements UserTokenServiceInterface
{
    public function __construct(
        private RandomHelperInterface $randomHelper,
        private UserTokenRepositoryInterface $userTokenRepository
    ) {
    }

    /**
     * @param int $secretLength
     *
     * @return UserToken
     */
    public function generateSecret(UserToken $token, $secretLength = 32)
    {
        do {
            $randomSecret   = $this->randomHelper->generate($secretLength);
            $isSecretUnique = $this->userTokenRepository->isSecretUnique($randomSecret);
        } while (false === $isSecretUnique);

        return $token->setSecret($randomSecret);
    }

    /**
     * @return bool
     */
    public function verify(UserToken $token)
    {
        return $this->userTokenRepository->verify($token);
    }
}