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<?php
/**
 * @file
 * Contains \Drupal\user\UserAuth.
 */
namespace Drupal\user;
use Drupal\Core\Entity\EntityManagerInterface;
use Drupal\Core\Password\PasswordInterface;
/**
 * Validates user authentication credentials.
 */
class UserAuth implements UserAuthInterface {
  /**
   * The entity manager.
   *
   * @var \Drupal\Core\Entity\EntityManagerInterface
   */
  protected $entityManager;
  /**
   * The password hashing service.
   *
   * @var \Drupal\Core\Password\PasswordInterface
   */
  protected $passwordChecker;
  /**
   * Constructs a UserAuth object.
   *
   * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
   *   The entity manager.
   * @param \Drupal\Core\Password\PasswordInterface $password_checker
   *   The password service.
   */
  public function __construct(EntityManagerInterface $entity_manager, PasswordInterface $password_checker) {
    $this->entityManager = $entity_manager;
    $this->passwordChecker = $password_checker;
  }
  /**
   * {@inheritdoc}
   */
  public function authenticate($username, $password) {
    $uid = FALSE;
    if (!empty($username) && strlen($password) > 0) {
      $account_search = $this->entityManager->getStorage('user')->loadByProperties(array('name' => $username));
      if ($account = reset($account_search)) {
        if ($this->passwordChecker->check($password, $account->getPassword())) {
          // Successful authentication.
          $uid = $account->id();
          // Update user to new password scheme if needed.
          if ($this->passwordChecker->needsRehash($account->getPassword())) {
            $account->setPassword($password);
            $account->save();
          }
        }
      }
    }
    return $uid;
  }
}