materio-d8/web/modules/custom/materio_user/src/Controller/AjaxLoginBlock.php

<?php

namespace Drupal\materio_user\Controller;

use Drupal\Core\Controller\ControllerBase;
use Symfony\Component\HttpFoundation\Request;
use Drupal\block\Entity\Block;
use Symfony\Component\HttpFoundation\JsonResponse;
// use Drupal\Core\Cache\CacheableJsonResponse;
// use Drupal\Core\Cache\CacheableMetadata;
// use Drupal\core\render\RenderContext;


/**
 * Defines a route controller.
 */
class AjaxLoginBlock extends ControllerBase {

  private function getBlockDefinition(){
    // $language = \Drupal::languageManager()->getCurrentLanguage()->getId();
    // \Drupal::logger('materio_user')->notice($language);
    $this->bid = "userlogin";
    $this->block = Block::load($this->bid);
    $this->block_builded = \Drupal::entityTypeManager()->getViewBuilder('block')->view($this->block);
  }

  /**
   * Handler for getBlock request.
   */
  public function getBlock(Request $request) {

    $this->getBlockDefinition();

    $rendered = \Drupal::service('renderer')->renderRoot($this->block_builded);
    $data = [
      'rendered' => $rendered,
      // '#cache' => [
      //   'max-age' => \Drupal\Core\Cache\Cache::PERMANENT,
      //   'tags' => [
      //     'materio_sapi-search_form-cache',
      //   ]
      // ]
    ];

    $response = new JsonResponse();
    $response->setData($data);
    // $response = new CacheableJsonResponse($data);
    // $response->addCacheableDependency(CacheableMetadata::createFromRenderArray($data));

    return $response;
  }


}