EntityTypeOptions.php

<?php

namespace Drupal\rules\TypedData\Options;

use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
use Drupal\Core\Entity\ContentEntityTypeInterface;
use Drupal\Core\Entity\EntityTypeManagerInterface;
use Drupal\Core\Session\AccountInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Options provider to list all entity types.
 */
class EntityTypeOptions extends OptionsProviderBase implements ContainerInjectionInterface {
    
    /**
     * The entity type manager service.
     *
     * @var \Drupal\Core\Entity\EntityTypeManagerInterface
     */
    protected $entityTypeManager;
    
    /**
     * Constructs a EntityTypeOptions object.
     *
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
     *   The entity type manager service.
     */
    public function __construct(EntityTypeManagerInterface $entity_type_manager) {
        $this->entityTypeManager = $entity_type_manager;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('entity_type.manager'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function getPossibleOptions(AccountInterface $account = NULL) {
        $options = [];
        // Load all the entity types.
        $entity_types = $this->entityTypeManager
            ->getDefinitions();
        foreach ($entity_types as $entity_type) {
            if (!$entity_type instanceof ContentEntityTypeInterface) {
                continue;
            }
            $options[$entity_type->id()] = (string) $entity_type->getLabel();
            // If the id differs from the label add the id in brackets for clarity.
            if (strtolower(str_replace('_', ' ', $entity_type->id())) != strtolower($entity_type->getLabel())) {
                $options[$entity_type->id()] .= ' (' . $entity_type->id() . ')';
            }
        }
        // Sort the result by value for ease of locating and selecting.
        asort($options);
        return $options;
    }

}