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1 <?php 2 /** 3 * Server-side rendering of the `core/legacy-widget` block. 4 * 5 * @package WordPress 6 */ 7 8 /** 9 * Renders the 'core/legacy-widget' block. 10 * 11 * @since 5.8.0 12 * 13 * @global int $wp_widget_factory. 14 * 15 * @param array $attributes The block attributes. 16 * 17 * @return string Rendered block. 18 */ 19 function render_block_core_legacy_widget( $attributes ) { 20 global $wp_widget_factory; 21 22 if ( isset( $attributes['id'] ) ) { 23 $sidebar_id = wp_find_widgets_sidebar( $attributes['id'] ); 24 return wp_render_widget( $attributes['id'], $sidebar_id ); 25 } 26 27 if ( ! isset( $attributes['idBase'] ) ) { 28 return ''; 29 } 30 31 $id_base = $attributes['idBase']; 32 $widget_key = $wp_widget_factory->get_widget_key( $id_base ); 33 $widget_object = $wp_widget_factory->get_widget_object( $id_base ); 34 35 if ( ! $widget_key || ! $widget_object ) { 36 return ''; 37 } 38 39 if ( isset( $attributes['instance']['encoded'], $attributes['instance']['hash'] ) ) { 40 $serialized_instance = base64_decode( $attributes['instance']['encoded'] ); 41 if ( ! hash_equals( wp_hash( $serialized_instance ), (string) $attributes['instance']['hash'] ) ) { 42 return ''; 43 } 44 $instance = unserialize( $serialized_instance ); 45 } else { 46 $instance = array(); 47 } 48 49 $args = array( 50 'widget_id' => $widget_object->id, 51 'widget_name' => $widget_object->name, 52 ); 53 54 ob_start(); 55 the_widget( $widget_key, $instance, $args ); 56 return ob_get_clean(); 57 } 58 59 /** 60 * Registers the 'core/legacy-widget' block. 61 * 62 * @since 5.8.0 63 */ 64 function register_block_core_legacy_widget() { 65 register_block_type_from_metadata( 66 __DIR__ . '/legacy-widget', 67 array( 68 'render_callback' => 'render_block_core_legacy_widget', 69 ) 70 ); 71 } 72 73 add_action( 'init', 'register_block_core_legacy_widget' ); 74 75 /** 76 * Intercepts any request with legacy-widget-preview in the query param and, if 77 * set, renders a page containing a preview of the requested Legacy Widget 78 * block. 79 * 80 * @since 5.8.0 81 */ 82 function handle_legacy_widget_preview_iframe() { 83 if ( empty( $_GET['legacy-widget-preview'] ) ) { 84 return; 85 } 86 87 if ( ! current_user_can( 'edit_theme_options' ) ) { 88 return; 89 } 90 91 define( 'IFRAME_REQUEST', true ); 92 93 ?> 94 <!doctype html> 95 <html <?php language_attributes(); ?>> 96 <head> 97 <meta charset="<?php bloginfo( 'charset' ); ?>" /> 98 <meta name="viewport" content="width=device-width, initial-scale=1" /> 99 <link rel="profile" href="https://gmpg.org/xfn/11" /> 100 <?php wp_head(); ?> 101 <style> 102 /* Reset theme styles */ 103 html, body, #page, #content { 104 padding: 0 !important; 105 margin: 0 !important; 106 } 107 108 /* Hide root level text nodes */ 109 body { 110 font-size: 0 !important; 111 } 112 113 /* Hide non-widget elements */ 114 body *:not(#page):not(#content):not(.widget):not(.widget *) { 115 display: none !important; 116 font-size: 0 !important; 117 height: 0 !important; 118 left: -9999px !important; 119 max-height: 0 !important; 120 max-width: 0 !important; 121 opacity: 0 !important; 122 pointer-events: none !important; 123 position: absolute !important; 124 top: -9999px !important; 125 transform: translate(-9999px, -9999px) !important; 126 visibility: hidden !important; 127 z-index: -999 !important; 128 } 129 130 /* Restore widget font-size */ 131 .widget { 132 font-size: var(--global--font-size-base); 133 } 134 </style> 135 </head> 136 <body <?php body_class(); ?>> 137 <div id="page" class="site"> 138 <div id="content" class="site-content"> 139 <?php 140 $registry = WP_Block_Type_Registry::get_instance(); 141 $block = $registry->get_registered( 'core/legacy-widget' ); 142 echo $block->render( $_GET['legacy-widget-preview'] ); 143 ?> 144 </div><!-- #content --> 145 </div><!-- #page --> 146 <?php wp_footer(); ?> 147 </body> 148 </html> 149 <?php 150 151 exit; 152 } 153 154 // Use admin_init instead of init to ensure get_current_screen function is already available. 155 // This isn't strictly required, but enables better compatibility with existing plugins. 156 // See: https://github.com/WordPress/gutenberg/issues/32624. 157 add_action( 'admin_init', 'handle_legacy_widget_preview_iframe', 20 );
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