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   1  <?php
   2  /**
   3   * Post Meta source for the block bindings.
   4   *
   5   * @since 6.5.0
   6   * @package WordPress
   7   * @subpackage Block Bindings
   8   */
   9  
  10  /**
  11   * Gets value for Post Meta source.
  12   *
  13   * @since 6.5.0
  14   * @access private
  15   *
  16   * @param array    $source_args    Array containing source arguments used to look up the override value.
  17   *                                 Example: array( "key" => "foo" ).
  18   * @param WP_Block $block_instance The block instance.
  19   * @return mixed The value computed for the source.
  20   */
  21  function _block_bindings_post_meta_get_value( array $source_args, $block_instance ) {
  22      if ( empty( $source_args['key'] ) ) {
  23          return null;
  24      }
  25  
  26      if ( empty( $block_instance->context['postId'] ) ) {
  27          return null;
  28      }
  29      $post_id = $block_instance->context['postId'];
  30  
  31      // If a post isn't public, we need to prevent unauthorized users from accessing the post meta.
  32      $post = get_post( $post_id );
  33      if ( ( ! is_post_publicly_viewable( $post ) && ! current_user_can( 'read_post', $post_id ) ) || post_password_required( $post ) ) {
  34          return null;
  35      }
  36  
  37      // Check if the meta field is protected.
  38      if ( is_protected_meta( $source_args['key'], 'post' ) ) {
  39          return null;
  40      }
  41  
  42      // Check if the meta field is registered to be shown in REST.
  43      $meta_keys = get_registered_meta_keys( 'post', $block_instance->context['postType'] );
  44      // Add fields registered for all subtypes.
  45      $meta_keys = array_merge( $meta_keys, get_registered_meta_keys( 'post', '' ) );
  46      if ( empty( $meta_keys[ $source_args['key'] ]['show_in_rest'] ) ) {
  47          return null;
  48      }
  49  
  50      return get_post_meta( $post_id, $source_args['key'], true );
  51  }
  52  
  53  /**
  54   * Registers Post Meta source in the block bindings registry.
  55   *
  56   * @since 6.5.0
  57   * @access private
  58   */
  59  function _register_block_bindings_post_meta_source() {
  60      register_block_bindings_source(
  61          'core/post-meta',
  62          array(
  63              'label'              => _x( 'Post Meta', 'block bindings source' ),
  64              'get_value_callback' => '_block_bindings_post_meta_get_value',
  65              'uses_context'       => array( 'postId', 'postType' ),
  66          )
  67      );
  68  }
  69  
  70  add_action( 'init', '_register_block_bindings_post_meta_source' );