WP_Customize_Manager::customize_preview_init()

Source

public function customize_preview_init() {

	/*
	 * Now that Customizer previews are loaded into iframes via GET requests
	 * and natural URLs with transaction UUIDs added, we need to ensure that
	 * the responses are never cached by proxies. In practice, this will not
	 * be needed if the user is logged-in anyway. But if anonymous access is
	 * allowed then the auth cookies would not be sent and WordPress would
	 * not send no-cache headers by default.
	 */
	if ( ! headers_sent() ) {
		nocache_headers();
		header( 'X-Robots: noindex, nofollow, noarchive' );
		header( 'X-Robots-Tag: noindex, nofollow, noarchive' );
	}
	add_filter( 'wp_robots', 'wp_robots_no_robots' );
	add_filter( 'wp_headers', array( $this, 'filter_iframe_security_headers' ) );

	/*
	 * If preview is being served inside the customizer preview iframe, and
	 * 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,
			sprintf(
				/* translators: %s: customize_messenger_channel */
				__( 'Unauthorized. You may remove the %s param to preview as frontend.' ),
				'<code>customize_messenger_channel<code>'
			)
		);
		return;
	}

	$this->prepare_controls();

	add_filter( 'wp_redirect', array( $this, 'add_state_query_params' ) );

	wp_enqueue_script( 'customize-preview' );
	wp_enqueue_style( 'customize-preview' );
	add_action( 'wp_head', array( $this, 'customize_preview_loading_style' ) );
	add_action( 'wp_head', array( $this, 'remove_frameless_preview_messenger_channel' ) );
	add_action( 'wp_footer', array( $this, 'customize_preview_settings' ), 20 );
	add_filter( 'get_edit_post_link', '__return_empty_string' );

	/**
	 * Fires once the Customizer preview has initialized and JavaScript
	 * settings have been printed.
	 *
	 * @since 3.4.0
	 *
	 * @param WP_Customize_Manager $manager WP_Customize_Manager instance.
	 */
	do_action( 'customize_preview_init', $this );
}

View all references View on Trac View on GitHub