Блок с контекстом

HooverMediaBlock.php

<?php

namespace Drupal\hoover\Plugin\Block;

use Drupal\Core\Block\BlockBase;
use Drupal\Core\Access\AccessResult;
use Drupal\Core\Session\AccountInterface;
use Drupal\Core\Field\FieldItemListInterface;
use Drupal\file\Entity\File;
use Drupal\image\Entity\ImageStyle;
use Drupal\Core\Entity\Query\QueryInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Template\Attribute;

/**
 * Provides a 'HooverMediaBlock' block.
 *
 * @Block(
 *  id = "hoover_media_block",
 *  admin_label = @Translation("Hoover media block"),
 *  context = {
 *     "hoover" = @ContextDefinition(
 *       "entity:node",
 *       label = @Translation("Hoover Node")
 *     )
 *   }
 * )
 */
class HooverMediaBlock extends BlockBase {

  /**
   * {@inheritdoc}
   */
  public function defaultConfiguration() {
    return [
      'large_style' => 'hoover_medium',
      'thumbnail' => 'thumbnail',
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function blockForm($form, FormStateInterface $form_state) {
    $image_styles = \Drupal::entityQuery('image_style')->execute();

   // dpm($image_styles);
    $form['large_style'] = [
      '#type' => 'select',
      '#title' => $this->t('Image style'),
      '#options' => $image_styles,
      '#description' => $this->t('Image style'),
      '#default_value' => $this->configuration['large_style'],
    ];
    $form['thumbnail'] = [
      '#type' => 'select',
      '#title' => $this->t('Thumbnail Image style'),
      '#options' => $image_styles,
      '#description' => $this->t('Thumbnail Image style'),
      '#default_value' => $this->configuration['thumbnail'],
    ];
    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function blockSubmit($form, FormStateInterface $form_state) {
    $this->configuration['large_style']
      = $form_state->getValue('large_style');
    $this->configuration['thumbnail']
      = $form_state->getValue('thumbnail');
  }

  /**
   * {@inheritdoc}
   */
  public function build() {
    $build = [];
    $hoover = $this->getContextValue('hoover');
    if($hoover->hasField('field_photos')) {
      $node = $hoover->toArray();
      $photos = $node['field_photos'];

      foreach ($photos as $key => $photo) {
        $file = File::load($photo['target_id']);
        $photos[$key]['large_img'] = ImageStyle::load($this->configuration['large_style'])->buildUrl($file->getFileUri());
        $photos[$key]['thumbnail'] = ImageStyle::load($this->configuration['thumbnail'])->buildUrl($file->getFileUri());
        $classes = array(
          'fid-' . $file->id(),
        );
        $photos[$key]['attributes'] = new Attribute($photos[$key]['attributes']);
        $photos[$key]['attributes']->addClass($classes);

      }

      $build['hoover_media_block'] = array(
        '#theme' => 'hoover_media_block',
        '#items' => $photos,
      );

    }

    return $build;
  }

}