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<?php

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/**

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* Server-side rendering of the `core/legacy-widget` block.

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* @package WordPress

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/**

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* Renders the 'core/legacy-widget' block.

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* @since 5.8.0

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* @global WP_Widget_Factory $wp_widget_factory.

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* @param array $attributes The block attributes.

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* @return string Rendered block.

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function render_block_core_legacy_widget( $attributes ) {

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global $wp_widget_factory;

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if ( isset( $attributes['id'] ) ) {

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$sidebar_id = wp_find_widgets_sidebar( $attributes['id'] );

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return wp_render_widget( $attributes['id'], $sidebar_id );

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}

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if ( ! isset( $attributes['idBase'] ) ) {

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return '';

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}

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$id_base = $attributes['idBase'];

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$widget_key = $wp_widget_factory->get_widget_key( $id_base );

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$widget_object = $wp_widget_factory->get_widget_object( $id_base );

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if ( ! $widget_key || ! $widget_object ) {

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return '';

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}

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if ( isset( $attributes['instance']['encoded'], $attributes['instance']['hash'] ) ) {

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$serialized_instance = base64_decode( $attributes['instance']['encoded'] );

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if ( ! hash_equals( wp_hash( $serialized_instance ), (string) $attributes['instance']['hash'] ) ) {

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return '';

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}

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$instance = unserialize( $serialized_instance );

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} else {

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$instance = array();

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}

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$args = array(

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'widget_id' => $widget_object->id,

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'widget_name' => $widget_object->name,

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);

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ob_start();

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the_widget( $widget_key, $instance, $args );

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return ob_get_clean();

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}

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/**

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* Registers the 'core/legacy-widget' block.

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* @since 5.8.0

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function register_block_core_legacy_widget() {

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register_block_type_from_metadata(

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__DIR__ . '/legacy-widget',

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array(

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'render_callback' => 'render_block_core_legacy_widget',

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)

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);

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}

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add_action( 'init', 'register_block_core_legacy_widget' );

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/**

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* Intercepts any request with legacy-widget-preview in the query param and, if

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* set, renders a page containing a preview of the requested Legacy Widget

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* block.

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* @since 5.8.0

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function handle_legacy_widget_preview_iframe() {

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if ( empty( $_GET['legacy-widget-preview'] ) ) {

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return;

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}

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if ( ! current_user_can( 'edit_theme_options' ) ) {

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return;

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}

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define( 'IFRAME_REQUEST', true );

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<!doctype html>

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<head>

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<?php wp_head(); ?>

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<style>

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/* Reset theme styles */

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html, body, #page, #content {

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padding: 0 !important;

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margin: 0 !important;

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}

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/* Hide root level text nodes */

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body {

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font-size: 0 !important;

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}

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/* Hide non-widget elements */

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body *:not(#page):not(#content):not(.widget):not(.widget *) {

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display: none !important;

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font-size: 0 !important;

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height: 0 !important;

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left: -9999px !important;

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max-height: 0 !important;

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max-width: 0 !important;

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opacity: 0 !important;

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pointer-events: none !important;

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position: absolute !important;

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top: -9999px !important;

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transform: translate(-9999px, -9999px) !important;

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visibility: hidden !important;

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z-index: -999 !important;

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}

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/* Restore widget font-size */

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.widget {

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font-size: var(--global--font-size-base);

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}

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</style>

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</head>

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<?php

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$registry = WP_Block_Type_Registry::get_instance();

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$block = $registry->get_registered( 'core/legacy-widget' );

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echo $block->render( $_GET['legacy-widget-preview'] );

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</div>

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</div>

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<?php wp_footer(); ?>

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</body>

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</html>

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<?php

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exit;

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}

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// Use admin_init instead of init to ensure get_current_screen function is already available.

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// This isn't strictly required, but enables better compatibility with existing plugins.

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// See: https://github.com/WordPress/gutenberg/issues/32624.

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add_action( 'admin_init', 'handle_legacy_widget_preview_iframe', 20 );

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