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<?php

/**
   * Responds to POST requests.
   *
   * Returns a list of bundles for specified entity.
   *
   * @param $node_type
   * @param $data
   * @return \Drupal\rest\ResourceResponse Throws exception expected.
   * Throws exception expected.
   */
  public function post($node_type, $data) {

    // You must to implement the logic of your REST Resource here.
    // Use current user after pass authentication to validate access.
    if (!$this->currentUser->hasPermission('access content')) {
      throw new AccessDeniedHttpException();
    }

    $node = Node::create(
      array(
        'type' => $node_type,
        'title' => $data->title->value,
        'body' => [
          'summary' => '',
          'value' => $data->body->value,
          'format' => 'full_html',
        ],
      )
    );
    $node->save();
    return new ResourceResponse($node);
  }