<?php
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Url;
/**
 * Implements hook_entity_type_alter().
 *
 * Adds the Metadata Profile tab to the entity configuration page.
 */
function metadata_profile_entity_type_alter(array &$entity_types) {
  /** @var \Drupal\Core\Entity\EntityTypeInterface $entity_type */
  foreach ($entity_types as $entity_type) {
    if ($entity_type->getBundleOf() && $entity_type->hasLinkTemplate('edit-form')) {
      $entity_type->setLinkTemplate('metadata-profile', $entity_type->getLinkTemplate('edit-form') . "/metadata-profile");
      $entity_type->setLinkTemplate('metadata-download', $entity_type->getLinkTemplate('edit-form') . "/metadata-profile/download");
    }
  }
}

/**
 * Implements hook_file_download().
 */
function metadata_profile_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 = $request->attributes->get('_route');
    // Check if we were called by Profile download route.
    // No additional access checking needed here: route requires
    // "export configuration" permission, token is validated by the controller.
    // @see \Drupal\features\Controller\FeaturesController::downloadExport()
    if (str_ends_with($route, 'metadata_profile.download')) {
      return [
        'Content-disposition' => 'attachment; filename="' . $target . '"',
      ];
    }
  }
  return NULL;
}

/**
 * Implements hook_entity_operation_alter().
 */
function metadata_profile_entity_operation_alter(array &$operations, EntityInterface $entity) {
  if ($entity->getEntityTypeId() === 'node_type') {

    $operations['metadata_profile'] = [
      'title' => t('Metadata profile'),
      'weight' => 50,
      'url' => Url::fromRoute('entity.node_type.metadata_profile', [
        'node_type' => $entity->id(),
      ]),
    ];
  }
}