/**
  * {@inheritdoc}
  */
 protected function checkAuthentication(UserInterface $user, UsernamePasswordToken $token)
 {
     $currentUser = $token->getUser();
     $presentedPassword = $token->getCredentials();
     if ($currentUser instanceof UserInterface) {
         if ('' === $presentedPassword) {
             throw new BadCredentialsException('The password in the token is empty. You may forgive turn off `erase_credentials` in your `security.yml`');
         }
         if (!$this->ldapManager->bind($currentUser, $presentedPassword)) {
             throw new BadCredentialsException('The credentials were changed from another session.');
         }
     } else {
         if ('' === $presentedPassword) {
             throw new BadCredentialsException('The presented password cannot be empty.');
         }
         if (!$this->ldapManager->bind($user, $presentedPassword)) {
             throw new BadCredentialsException('The presented password is invalid.');
         }
     }
 }
 /**
  * {@inheritdoc}
  */
 protected function checkAuthentication(UserInterface $user, UsernamePasswordToken $token)
 {
     $currentUser = $token->getUser();
     if ($currentUser instanceof LdapUserInterface) {
         if (!$this->ldapManager->bind($currentUser, $currentUser->getPassword())) {
             throw new BadCredentialsException('The credentials were changed from another session.');
         }
     } else {
         if (!$user->getDn()) {
             $userLdap = $this->ldapManager->findUserByUsername($user->getUsername());
             if (!$userLdap) {
                 throw new BadCredentialsException(sprintf('User "%s" not found', $user->getUsername()));
             }
             $user->setDn($userLdap->getDn());
         }
         if (!($presentedPassword = $token->getCredentials())) {
             throw new BadCredentialsException('The presented password cannot be empty.');
         }
         if (!$this->ldapManager->bind($user, $presentedPassword)) {
             throw new BadCredentialsException('The presented password is invalid.');
         }
     }
 }