gistfile1.txt

<?php

namespace Drupal\bullseye_api\Normalizer;

use Drupal\serialization\Normalizer\NormalizerBase;
use Drupal\serialization\Normalizer\ContentEntityNormalizer;
use Drupal\Core\Datetime\DrupalDateTime;
use Drupal\node\Entity\Node;

/**
* Custom Normalization for Benefit entities.
*/
class BenefitNormalizer extends ContentEntityNormalizer {

  protected $supportedInterfaceOrClass = 'Drupal\Core\TypedData\TypedDataInterface';

  public function supportsNormalization($data, $format = NULL) {
    // If we aren't dealing with an object or the format is not supported return now.
    if (!is_object($data) || !$this->checkFormat($format)) {
      return FALSE;
    }
    // This custom normalizer should be supported for Article bundle for the Node Entity.
    if ($data instanceof Node) {
      return ($data->bundle() == 'article');
    }

    // Otherwise, this normalizer does not support the $data object.
    return FALSE;
  }

  /**
  * {@inheritdoc}
  */
  public function normalize($entity, $format = NULL, array $context = array()) {
    $data = [];
    
    $data =  [
      'id' => $entity->id(),
      'type' => $entity->bundle(),
      'title' => $entity->title->value,
      'summary' => $entity->body->summary,
      ...
    ];
    
    return $data;
  }
}