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- <?php
- /**
- * Server-side rendering of the `core/legacy-widget` block.
- *
- * @package WordPress
- */
- /**
- * Renders the 'core/legacy-widget' block.
- *
- * @param array $attributes The block attributes.
- *
- * @return string Rendered block.
- */
- function render_block_core_legacy_widget( $attributes ) {
- global $wp_widget_factory;
- if ( isset( $attributes['id'] ) ) {
- $sidebar_id = wp_find_widgets_sidebar( $attributes['id'] );
- return wp_render_widget( $attributes['id'], $sidebar_id );
- }
- if ( ! isset( $attributes['idBase'] ) ) {
- return '';
- }
- $id_base = $attributes['idBase'];
- $widget_key = $wp_widget_factory->get_widget_key( $id_base );
- $widget_object = $wp_widget_factory->get_widget_object( $id_base );
- if ( ! $widget_key || ! $widget_object ) {
- return '';
- }
- if ( isset( $attributes['instance']['encoded'], $attributes['instance']['hash'] ) ) {
- $serialized_instance = base64_decode( $attributes['instance']['encoded'] );
- if ( ! hash_equals( wp_hash( $serialized_instance ), (string) $attributes['instance']['hash'] ) ) {
- return '';
- }
- $instance = unserialize( $serialized_instance );
- } else {
- $instance = array();
- }
- $args = array(
- 'widget_id' => $widget_object->id,
- 'widget_name' => $widget_object->name,
- );
- ob_start();
- the_widget( $widget_key, $instance, $args );
- return ob_get_clean();
- }
- /**
- * Registers the 'core/legacy-widget' block.
- */
- function register_block_core_legacy_widget() {
- register_block_type_from_metadata(
- __DIR__ . '/legacy-widget',
- array(
- 'render_callback' => 'render_block_core_legacy_widget',
- )
- );
- }
- add_action( 'init', 'register_block_core_legacy_widget' );
- /**
- * Intercepts any request with legacy-widget-preview in the query param and, if
- * set, renders a page containing a preview of the requested Legacy Widget
- * block.
- */
- function handle_legacy_widget_preview_iframe() {
- if ( empty( $_GET['legacy-widget-preview'] ) ) {
- return;
- }
- if ( ! current_user_can( 'edit_theme_options' ) ) {
- return;
- }
- define( 'IFRAME_REQUEST', true );
- ?>
- <!doctype html>
- <html <?php language_attributes(); ?>>
- <head>
- <meta charset="<?php bloginfo( 'charset' ); ?>" />
- <meta name="viewport" content="width=device-width, initial-scale=1" />
- <link rel="profile" href="https://gmpg.org/xfn/11" />
- <?php wp_head(); ?>
- <style>
- /* Reset theme styles */
- html, body, #page, #content {
- padding: 0 !important;
- margin: 0 !important;
- }
- /* Hide root level text nodes */
- body {
- font-size: 0 !important;
- }
- /* Hide non-widget elements */
- body *:not(#page):not(#content):not(.widget):not(.widget *) {
- display: none !important;
- font-size: 0 !important;
- height: 0 !important;
- left: -9999px !important;
- max-height: 0 !important;
- max-width: 0 !important;
- opacity: 0 !important;
- pointer-events: none !important;
- position: absolute !important;
- top: -9999px !important;
- transform: translate(-9999px, -9999px) !important;
- visibility: hidden !important;
- z-index: -999 !important;
- }
- /* Restore widget font-size */
- .widget {
- font-size: var(--global--font-size-base);
- }
- </style>
- </head>
- <body <?php body_class(); ?>>
- <div id="page" class="site">
- <div id="content" class="site-content">
- <?php
- $registry = WP_Block_Type_Registry::get_instance();
- $block = $registry->get_registered( 'core/legacy-widget' );
- echo $block->render( $_GET['legacy-widget-preview'] );
- ?>
- </div><!-- #content -->
- </div><!-- #page -->
- <?php wp_footer(); ?>
- </body>
- </html>
- <?php
- exit;
- }
- // Use admin_init instead of init to ensure get_current_screen function is already available.
- // This isn't strictly required, but enables better compatibility with existing plugins.
- // See: https://github.com/WordPress/gutenberg/issues/32624.
- add_action( 'admin_init', 'handle_legacy_widget_preview_iframe', 20 );
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