PartKeepr\AuthBundle\Security\User\LegacyUserProvider::loadUserByUsername PHP Method

    public function loadUserByUsername($username)
    {
        $repository = $this->entityManager->getRepository('PartKeepr\\AuthBundle\\Entity\\User');
        $user = $repository->findOneBy(['username' => $username, 'legacy' => true]);
        if ($user !== null) {
            return $user;
        }
        throw new UsernameNotFoundException(sprintf('Username "%s" does not exist.', $username));
    }