certificate-4.0.0-alpha1/src/Routing/CertificateRoutes.php

<?php

namespace Drupal\certificate\Routing;

use Symfony\Component\Routing\Route;
use function certificate_get_entity_types;

/**
 * Defines dynamic routes.
 */
class CertificateRoutes {

  /**
   * {@inheritdoc}
   */
  public function routes() {
    $routes = [];
    $etm = \Drupal::entityTypeManager();
    foreach (certificate_get_entity_types()  as $entity_type) {
      // Add a certificate route based on the canonical URL.
      $template = $etm->getStorage($entity_type)->getEntityType()->getLinkTemplate('canonical');

      $tab_route = new Route($template . '/certificate');
      $tab_route->setDefault('_controller', '\Drupal\certificate\Controller\CertificateController::certificatePage');
      $tab_route->setDefault('_title', 'Certificate');
      $tab_route->setOption('parameters', [
        $entity_type => [
          'type' => "entity:$entity_type",
        ],
      ]);
      $tab_route->setRequirements(['_custom_access' => '\Drupal\certificate\Controller\CertificateController::accessTab']);
      $routes["certificate.$entity_type"] = $tab_route;

      $user_tab_route = clone $tab_route;
      $user_tab_route->setPath($template . '/certificate/{user}');
      $user_tab_route->setOption('parameters', [
        $entity_type => [
          'type' => "entity:$entity_type",
        ],
        'user' => [
          'type' => 'entity:user',
        ],
      ]);
      $routes["certificate.$entity_type.user"] = $user_tab_route;

      $pdf_route = new Route("$entity_type/{{$entity_type}}/certificate/{user}/{certificate_template}/pdf");
      $pdf_route->setDefault('_controller', '\Drupal\certificate\Controller\CertificateController::certificateDownload');
      $pdf_route->setDefault('_title', 'Download');
      $pdf_route->setOption('params', [
        'user' => 'type: entity:user',
        'certificate_template' => 'type: entity:certificate_template',
      ]);
      $pdf_route->setRequirements(['_custom_access' => '\Drupal\certificate\Controller\CertificateController::accessPdf']);
      $routes["certificate.$entity_type.pdf"] = $pdf_route;
    }

    return $routes;
  }

}