video_embed_field-8.x-2.4/modules/video_embed_media/video_embed_media.install

<?php

/**
 * @file
 * Install file for video_embed_media.
 */

use Drupal\Core\File\FileExists;
use Drupal\Core\File\FileSystemInterface;

/**
 * Implements hook_install().
 */
function video_embed_media_install() {
  /** @var \Drupal\Core\File\FileSystemInterface $file_system */
  $file_system = \Drupal::service('file_system');
  // Copy the video icons into the right place.
  $icon_folder = \Drupal::service('extension.list.module')->getPath('video_embed_media') . '/images/icons';
  $destination = \Drupal::config('media.settings')->get('icon_base_uri');
  $file_system->prepareDirectory($destination, FileSystemInterface::CREATE_DIRECTORY | FileSystemInterface::MODIFY_PERMISSIONS);

  $files = $file_system->scanDirectory($icon_folder, '/.*\.(svg|png|jpg|jpeg|gif)$/');
  foreach ($files as $file) {
    // We don't want to copy the icons when they already exist. The icons could
    // be placed manually, so we don't want to replace the existing files.
    // Removing the files when we uninstall could also be a problem if the files
    // are referenced somewhere else. Since showing an error that it was not
    // possible to copy the files is also confusing, we silently do nothing.
    if (!file_exists($destination . DIRECTORY_SEPARATOR . $file->filename)) {
      $file_system->copy($file->uri, $destination, FileExists::Error);
    }
  }
}