http and https auth

class bd_http_https_auth {
    /**
     * @var bd_http_https_auth - Static property to hold our singleton instance
     */
    static $instance = false;

    private $_second_auth = false;

    private function __construct() {
        add_action( 'set_auth_cookie', array( $this, 'auth_again' ), null, 5 );
    }

    public function auth_again( $auth_cookie, $expire, $expiration, $user_id, $scheme ) {
        if ( !$this->_second_auth ) {
            $this->_second_auth = true;
            wp_set_auth_cookie( $user_id, (bool) $expire, (bool) ( $scheme == 'auth' ) );
            $this->_second_auth = false;
        }
    }

    /**
     * Function to instantiate our class and make it a singleton
     */
    public static function getInstance() {
        if ( !self::$instance ) {
            self::$instance = new self;
        }
        return self::$instance;
    }
}
$bd_http_https_auth = bd_http_https_auth::getInstance();