Categories.php

<?php
/**
 * @file
 * Drupal\knowledge_center\Plugin\rest\resource\Categories__1_0
 */

namespace Drupal\knowledge_center\Plugin\rest\resource;

use Drupal\knowledge_center\utility\RMRestResponse;
use Drupal\openapi\OpenApiGenerator\RestInspectionTrait;
use Drupal\rest\Plugin\ResourceBase;
use Drupal\knowledge_center\PublicFieldMappers\RMNodeListFieldMapper;
use Drupal\knowledge_center\ListBuilders\RMSubqueueListBuilder;
/**
 * Exported content type TEAM MEMBER.
 *
 * @class Article
 *
 * @RestResource(
 *   id = "Categories",
 *   label = @Translation("Categories"),
 *   uri_paths = {
 *     "canonical" = "/api/v1.0/categories/{taxonomy_term}"
 *   }
 * )
 */

class Categories__1_0 extends RMResourceBase {

  public function get($term) {
    $tax_machine_name = str_replace('-', "_", $term);
    $list = new RMSubqueueListBuilder($tax_machine_name);
    $list->limitCategory($tax_machine_name, "blog_categories");
    $mapper = new RMNodeListFieldMapper($list->getItems(), $this->getVersion());
    return new RMRestResponse($mapper->toArray());
  }


  public function options() {
    return new RMRestResponse($this->getResourceConfigs());
  }

}

RMResourceBase.php

<?php
/**
 * @file
 * Drupal\knowledge_center\Plugin\rest\resource\RMResourceBase
 */


namespace Drupal\knowledge_center\Plugin\rest\resource;



use Drupal\rest\Plugin\ResourceBase;

abstract class RMResourceBase extends ResourceBase {

  static $MAJOR_VERSION = "1";
  static $MINOR_VERSION = "0";

  function getVersion() {
    return sprintf("v%d.%d", self::$MAJOR_VERSION, self::$MINOR_VERSION);
  }



}