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/wp-includes/blocks/ -> legacy-widget.php (source)

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


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