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   1  <?php
   2  /**
   3   * Post Data source for Block Bindings.
   4   *
   5   * @since 6.9.0
   6   * @package WordPress
   7   * @subpackage Block Bindings
   8   */
   9  
  10  /**
  11   * Gets value for Post Data source.
  12   *
  13   * @since 6.9.0
  14   * @access private
  15   *
  16   * @param array    $source_args    Array containing arguments used to look up the source 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_data_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 data.
  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      if ( 'date' === $source_args['key'] ) {
  38          return esc_attr( get_the_date( 'c', $post_id ) );
  39      }
  40  
  41      if ( 'modified' === $source_args['key'] ) {
  42          // Only return the modified date if it is later than the publishing date.
  43          if ( get_the_modified_date( 'U', $post_id ) > get_the_date( 'U', $post_id ) ) {
  44              return esc_attr( get_the_modified_date( 'c', $post_id ) );
  45          } else {
  46              return '';
  47          }
  48      }
  49  }
  50  
  51  /**
  52   * Registers Post Data source in the block bindings registry.
  53   *
  54   * @since 6.9.0
  55   * @access private
  56   */
  57  function _register_block_bindings_post_data_source() {
  58      register_block_bindings_source(
  59          'core/post-data',
  60          array(
  61              'label'              => _x( 'Post Data', 'block bindings source' ),
  62              'get_value_callback' => '_block_bindings_post_data_get_value',
  63              'uses_context'       => array( 'postId', 'postType' ), // Both are needed on the client side.
  64          )
  65      );
  66  }
  67  
  68  add_action( 'init', '_register_block_bindings_post_data_source' );