epub_viewer-8.x-1.0/src/Controller/EpubController.php

<?php

namespace Drupal\epub_module\Controller;

use Drupal\Core\Config\ConfigFactory;
use Drupal\Core\Controller\ControllerBase;
use Drupal\Core\Extension\ModuleExtensionList;
use Drupal\Core\File\FileUrlGeneratorInterface;
use Drupal\Core\Render\RendererInterface;
use Drupal\Core\Url;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\HttpFoundation\Response;

/**
 * Controller for rendering epub file to the ebook viewer.
 */
class EpubController extends ControllerBase {

  /**
   * Returns the file_url_generator service.
   *
   * @var \Drupal\Core\File\FileUrlGeneratorInterface
   */
  protected $fileUrl;

  /**
   * Returns the extension.list.module service.
   *
   * @var \Drupal\Core\Extension\ModuleExtensionList
   */
  protected $listModule;

  /**
   * Returns the renderer service.
   *
   * @var \Drupal\Core\Render\RendererInterface
   */
  protected $renderer;

  /**
   * Returns the config.factory service.
   *
   * @var \Drupal\Core\Config\ConfigFactory
   */
  protected $config;

  /**
   * Constructs a EpubController object.
   *
   * @param \Drupal\Core\File\FileUrlGeneratorInterface $file_url
   *   Generates file URLs for a stream to an external or local file.
   * @param \Drupal\Core\Extension\ModuleExtensionList $list_module
   *   GProvides a list of available modules.
   * @param \Drupal\Core\Render\RendererInterface $renderer
   *   Defines an interface for turning a render array into a string.
   * @param \Drupal\Core\Config\ConfigFactory $config
   *   Defines the configuration object factory.
   */
  public function __construct(FileUrlGeneratorInterface $file_url, ModuleExtensionList $list_module, RendererInterface $renderer, ConfigFactory $config) {
    $this->fileUrl = $file_url;
    $this->listModule = $list_module;
    $this->renderer = $renderer;
    $this->config = $config;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static(
      $container->get('file_url_generator'),
      $container->get('extension.list.module'),
      $container->get('renderer'),
      $container->get('config.factory')
    );
  }

  /**
   * Function for rendering epub file to the ebook viewer.
   */
  public function viewEbook($fid = FALSE) {
    if ($fid) {
      global $base_url;
      $data = [];
      // Loading file from file ID.
      $file = $this->entityTypeManager()->getStorage('file')->load($fid);
      $file_uri = $file->getFileUri();
      $file_url = Url::fromUri($this->fileUrl->generateAbsoluteString($file_uri));
      $data['file_path'] = $file_url->getUri();
      $data['base_url'] = $base_url;
      $config = $this->config->get('epub_module.epubsettings');
      $options = [
        'background_color' => $config->get('background_color'),
        'icon_color' => $config->get('icon_color'),
        'font_color' => $config->get('font_color'),
        'show_download_icon' => $config->get('show_download_icon'),
      ];
      $module_path = $this->listModule->getPath('epub_module');
      $data['module_path'] = $base_url . '/' . $module_path;
      $build = [
        '#theme' => 'epub_view',
      // Sending file data to the viewer.
        '#data' => $data,
        '#options' => $options,
      ];
      $html = $this->renderer->renderRoot($build);
      $response = new Response();
      $response->setContent($html);
      return $response;
    }
  }

}