class EntityCreateDeriver

class EntityCreateDeriver extends DeriverBase implements ContainerDeriverInterface {
    use StringTranslationTrait;
    
    /**
     * The entity type manager service.
     *
     * @var \Drupal\Core\Entity\EntityTypeManagerInterface
     */
    protected $entityTypeManager;
    
    /**
     * The entity field manager service.
     *
     * @var \Drupal\Core\Entity\EntityFieldManagerInterface
     */
    protected $entityFieldManager;
    
    /**
     * Creates a new EntityCreateDeriver object.
     *
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
     *   The entity type manager service.
     * @param \Drupal\Core\Entity\EntityFieldManagerInterface $entity_field_manager
     *   The entity field manager service.
     * @param \Drupal\Core\StringTranslation\TranslationInterface $string_translation
     *   The string translation service.
     */
    public function __construct(EntityTypeManagerInterface $entity_type_manager, EntityFieldManagerInterface $entity_field_manager, TranslationInterface $string_translation) {
        $this->entityTypeManager = $entity_type_manager;
        $this->entityFieldManager = $entity_field_manager;
        $this->stringTranslation = $string_translation;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, $base_plugin_id) {
        return new static($container->get('entity_type.manager'), $container->get('entity_field.manager'), $container->get('string_translation'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDerivativeDefinitions($base_plugin_definition) {
        foreach ($this->entityTypeManager
            ->getDefinitions() as $entity_type_id => $entity_type) {
            // Only allow content entities and ignore configuration entities.
            if (!$entity_type instanceof ContentEntityTypeInterface) {
                continue;
            }
            $this->derivatives[$entity_type_id] = [
                'label' => $this->t('Create a new @entity_type entity', [
                    '@entity_type' => $entity_type->getSingularLabel(),
                ]),
                'category' => $entity_type->getLabel(),
                'entity_type_id' => $entity_type_id,
                'context_definitions' => [],
                'provides' => [
                    $entity_type->id() . '_created' => ContextDefinition::create("entity:{$entity_type_id}")->setLabel($this->t('Created @entity_type entity', [
                        '@entity_type' => $entity_type->getSingularLabel(),
                    ]))
                        ->setRequired(TRUE),
                ],
            ] + $base_plugin_definition;
            // Add a required context for the bundle key, and optional contexts for
            // other required base fields. This matches the storage create() behavior,
            // where only the bundle requirement is enforced.
            $bundle_key = $entity_type->getKey('bundle');
            $this->derivatives[$entity_type_id]['bundle_key'] = $bundle_key;
            $base_field_definitions = $this->entityFieldManager
                ->getBaseFieldDefinitions($entity_type_id);
            foreach ($base_field_definitions as $field_name => $definition) {
                if ($field_name != $bundle_key && !$definition->isRequired()) {
                    continue;
                }
                $item_definition = $definition->getItemDefinition();
                // @todo Add support for multi-property fields for entity creation.
                // @see https://www.drupal.org/node/2748791.
                $main_property_name = $item_definition->getMainPropertyName();
                if (is_null($main_property_name)) {
                    continue;
                }
                $type_definition = $item_definition->getPropertyDefinition($main_property_name);
                // Get around types which don't properly define their main property
                // or lack a main property entirely.
                if (is_null($type_definition)) {
                    continue;
                }
                // If this is an entity reference then we expect the target type as
                // context.
                if ($type_definition instanceof DataReferenceDefinitionInterface) {
                    $type_definition->getTargetDefinition();
                }
                $type = $type_definition->getDataType();
                $is_bundle = $field_name == $bundle_key;
                $multiple = $definition->getCardinality() === 1 ? FALSE : TRUE;
                $context_definition = ContextDefinition::create($type)->setLabel($definition->getLabel())
                    ->setRequired($is_bundle)
                    ->setMultiple($multiple)
                    ->setDescription($definition->getDescription());
                if ($is_bundle) {
                    $context_definition->setAssignmentRestriction(ContextDefinition::ASSIGNMENT_RESTRICTION_INPUT);
                }
                $this->derivatives[$entity_type_id]['context_definitions'][$field_name] = $context_definition;
            }
        }
        return $this->derivatives;
    }

}