class Cookie

class Cookie implements AuthenticationProviderInterface {
    
    /**
     * The session configuration.
     *
     * @var \Drupal\Core\Session\SessionConfigurationInterface
     */
    protected $sessionConfiguration;
    
    /**
     * The database connection.
     *
     * @var \Drupal\Core\Database\Connection
     */
    protected $connection;
    
    /**
     * Constructs a new cookie authentication provider.
     *
     * @param \Drupal\Core\Session\SessionConfigurationInterface $session_configuration
     *   The session configuration.
     * @param \Drupal\Core\Database\Connection $connection
     *   The database connection.
     */
    public function __construct(SessionConfigurationInterface $session_configuration, Connection $connection) {
        $this->sessionConfiguration = $session_configuration;
        $this->connection = $connection;
    }
    
    /**
     * {@inheritdoc}
     */
    public function applies(Request $request) {
        return $request->hasSession() && $this->sessionConfiguration
            ->hasSession($request);
    }
    
    /**
     * {@inheritdoc}
     */
    public function authenticate(Request $request) {
        return $this->getUserFromSession($request->getSession());
    }
    
    /**
     * Returns the UserSession object for the given session.
     *
     * @param \Symfony\Component\HttpFoundation\Session\SessionInterface $session
     *   The session.
     *
     * @return \Drupal\Core\Session\AccountInterface|null
     *   The UserSession object for the current user, or NULL if this is an
     *   anonymous session.
     */
    protected function getUserFromSession(SessionInterface $session) {
        if ($uid = $session->get('uid')) {
            // @todo Load the User entity in SessionHandler so we don't need queries.
            // @see https://www.drupal.org/node/2345611
            $values = $this->connection
                ->query('SELECT * FROM {users_field_data} u WHERE u.uid = :uid AND u.default_langcode = 1', [
                ':uid' => $uid,
            ])
                ->fetchAssoc();
            // Check if the user data was found and the user is active.
            if (!empty($values) && $values['status'] == 1) {
                // Add the user's roles.
                $rids = $this->connection
                    ->query('SELECT roles_target_id FROM {user__roles} WHERE entity_id = :uid', [
                    ':uid' => $values['uid'],
                ])
                    ->fetchCol();
                $values['roles'] = array_merge([
                    AccountInterface::AUTHENTICATED_ROLE,
                ], $rids);
                return new UserSession($values);
            }
        }
        // This is an anonymous session.
        return NULL;
    }

}