public function checkAuthentication(UserInterface $user, UsernamePasswordToken $token)
{
$connector = new Connector($user->getUsername(), $token->getCredentials());
if (!$connector->isSignedIn()) {
throw new BadCredentialsException();
}
$student = $connector->getStudent();
$user->fromStudent($student);
$user->setLastConnectionAt(new \DateTime());
if ($user->getId() == null || $user->getAccount() == null) {
$user->setAccount(new Account());
}
$this->em->persist($user);
$this->em->flush();
}