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   1  <?php
   2  /**
   3   * Server-side rendering of the `core/file` block.
   4   *
   5   * @package WordPress
   6   */
   7  
   8  /**
   9   * When the `core/file` block is rendering, check if we need to enqueue the `'wp-block-file-view` script.
  10   *
  11   * @param array  $attributes The block attributes.
  12   * @param string $content    The block content.
  13   *
  14   * @return string Returns the block content.
  15   */
  16  function render_block_core_file( $attributes, $content ) {
  17      $should_load_view_script = ! empty( $attributes['displayPreview'] ) && ! wp_script_is( 'wp-block-file-view' );
  18      if ( $should_load_view_script ) {
  19          wp_enqueue_script( 'wp-block-file-view' );
  20      }
  21  
  22      // Update object's aria-label attribute if present in block HTML.
  23  
  24      // Match an aria-label attribute from an object tag.
  25      $pattern = '@<object.+(?<attribute>aria-label="(?<filename>[^"]+)?")@i';
  26      $content = preg_replace_callback(
  27          $pattern,
  28          function ( $matches ) {
  29              $filename     = ! empty( $matches['filename'] ) ? $matches['filename'] : '';
  30              $has_filename = ! empty( $filename ) && 'PDF embed' !== $filename;
  31              $label        = $has_filename ?
  32                  sprintf(
  33                      /* translators: %s: filename. */
  34                      __( 'Embed of %s.' ),
  35                      $filename
  36                  )
  37                  : __( 'PDF embed' );
  38  
  39              return str_replace( $matches['attribute'], sprintf( 'aria-label="%s"', $label ), $matches[0] );
  40          },
  41          $content
  42      );
  43  
  44      return $content;
  45  }
  46  
  47  /**
  48   * Registers the `core/file` block on server.
  49   */
  50  function register_block_core_file() {
  51      register_block_type_from_metadata(
  52          __DIR__ . '/file',
  53          array(
  54              'render_callback' => 'render_block_core_file',
  55          )
  56      );
  57  }
  58  add_action( 'init', 'register_block_core_file' );