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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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* |
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* @package WordPress |
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*/ |
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/** |
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* Renders the 'core/legacy-widget' block. |
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* |
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* @param array $attributes The block attributes. |
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* |
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* @return string Rendered block. |
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*/ |
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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 ( wp_hash( $serialized_instance ) !== $attributes['instance']['hash'] ) { |
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return ''; |
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} |
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$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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*/ |
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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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*/ |
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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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?> |
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<!doctype html> |
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<html <?php language_attributes(); ?>> |
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<head> |
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<meta charset="<?php bloginfo( 'charset' ); ?>" /> |
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<meta name="viewport" content="width=device-width, initial-scale=1" /> |
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<link rel="profile" href="https://gmpg.org/xfn/11" /> |
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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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<body <?php body_class(); ?>> |
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<div id="page" class="site"> |
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<div id="content" class="site-content"> |
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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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?> |
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</div><!-- #content --> |
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</div><!-- #page --> |
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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 ); |