ntwb / wordpress

		 * In this way, the UUID serves as a secret key. If the messenger channel is present,

		 * then send unauthenticated code to prompt re-auth.

		 */

		if ( ! current_user_can( 'customize' ) && ! $this->changeset_post_id() ) {

			$this->wp_die( $this->messenger_channel ? 0 : -1, __( 'Non-existent changeset UUID.' ) );

		}

		if ( ! headers_sent() ) {

			send_origin_headers();

		 * if the user doesn't have customize capability, then it is assumed

		 * that the user's session has expired and they need to re-authenticate.

		 */

		if ( $this->messenger_channel && ! current_user_can( 'customize' ) ) {

			$this->wp_die( -1, __( 'Unauthorized. You may remove the customize_messenger_channel param to preview as frontend.' ) );

			return;

		}

		$this->prepare_controls();