class ConfigEntityCloneBase

class ConfigEntityCloneBase implements EntityHandlerInterface, EntityCloneInterface {
    
    /**
     * The entity type manager.
     *
     * @var \Drupal\Core\Entity\EntityTypeManagerInterface
     */
    protected $entityTypeManager;
    
    /**
     * The entity type ID.
     *
     * @var string
     */
    protected $entityTypeId;
    
    /**
     * Constructs a new ConfigEntityCloneBase.
     *
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
     *   The entity type manager.
     * @param string $entity_type_id
     *   The entity type ID.
     */
    public function __construct(EntityTypeManagerInterface $entity_type_manager, $entity_type_id) {
        $this->entityTypeManager = $entity_type_manager;
        $this->entityTypeId = $entity_type_id;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function createInstance(ContainerInterface $container, EntityTypeInterface $entity_type) {
        return new static($container->get('entity_type.manager'), $entity_type->id());
    }
    
    /**
     * {@inheritdoc}
     */
    public function cloneEntity(EntityInterface $entity, EntityInterface $cloned_entity, array $properties = []) {
        
        /** @var \Drupal\core\Config\Entity\ConfigEntityInterface $cloned_entity */
        $id_key = $this->entityTypeManager
            ->getDefinition($this->entityTypeId)
            ->getKey('id');
        $label_key = $this->entityTypeManager
            ->getDefinition($this->entityTypeId)
            ->getKey('label');
        // Set new entity properties.
        if (isset($properties['id'])) {
            if ($id_key) {
                $cloned_entity->set($id_key, $properties['id']);
            }
            unset($properties['id']);
        }
        if (isset($properties['label'])) {
            if ($label_key) {
                $cloned_entity->set($label_key, $properties['label']);
            }
            unset($properties['label']);
        }
        foreach ($properties as $key => $property) {
            $cloned_entity->set($key, $property);
        }
        $cloned_entity->save();
        return $cloned_entity;
    }

}