metadata_field_report.module

<?php

/**
 * @file
 * Module file for the field_report module.
 */

/**
 * Implements hook_page_attachments().
 */
function metadata_field_report_page_attachments(array &$page) {
  // Add our custom CSS.
  if (\Drupal::routeMatch()->getRouteName() !== 'metadata_field_report.field_report_controller_getEntityBundles') {
    $page['#attached']['library'][] = 'metadata_field_report/metadata_field-report';
  }
}

/**
 * Implements hook_file_download().
 */
function metadata_field_report_file_download($uri){
  $stream_wrapper_manager = \Drupal::service('stream_wrapper_manager');
  $scheme = $stream_wrapper_manager->getScheme($uri);
  $target = $stream_wrapper_manager->getTarget($uri);

  if ($scheme == 'temporary' && $target) {
    $request = \Drupal::request();
    $route = $request->attributes->get('_route');
    // Check if we were called by Features download route.
    // No additional access checking needed here: route requires
    // "export configuration" permission, token is validated by the controller.
    // @see \Drupal\features\Controller\FeaturesController::downloadExport()
    if ($route == 'metadata_field_report.download_bundle_report') {
      return [
        'Content-disposition' => 'attachment; filename="' . $target . '"',
      ];
    }
  }
}