function ValidReferenceConstraintValidator::validate

File

core/lib/Drupal/Core/Entity/Plugin/Validation/Constraint/ValidReferenceConstraintValidator.php, line 58

Class

ValidReferenceConstraintValidator

Checks if referenced entities are valid.

Namespace

Code

public function validate($value, Constraint $constraint) {
  /** @var \Drupal\Core\Field\FieldItemListInterface $value */
  /** @var ValidReferenceConstraint $constraint */
  if (!isset($value)) {
    return;
  }
  // Collect new entities and IDs of existing entities across the field items.
  $new_entities = [];
  $target_ids = [];
  foreach ($value as $delta => $item) {
    $target_id = $item->target_id;
    // We don't use a regular NotNull constraint for the target_id property as
    // NULL is allowed if the entity property contains an unsaved entity.
    // @see \Drupal\Core\TypedData\DataReferenceTargetDefinition::getConstraints()
    if (!$item->isEmpty() && $target_id === NULL) {
      if (!$item->entity
        ->isNew()) {
        $this->context
          ->buildViolation($constraint->nullMessage)
          ->atPath((string) $delta)
          ->addViolation();
        return;
      }
      $new_entities[$delta] = $item->entity;
    }
    // '0' or NULL are considered valid empty references.
    if (!empty($target_id)) {
      $target_ids[$delta] = $target_id;
    }
  }
  // Early opt-out if nothing to validate.
  if (!$new_entities && !$target_ids) {
    return;
  }
  $entity = !empty($value->getParent()) ? $value->getEntity() : NULL;
  /** @var \Drupal\Core\Entity\EntityReferenceSelection\SelectionInterface $handler * */
  $handler = $this->selectionManager
    ->getSelectionHandler($value->getFieldDefinition(), $entity);
  $target_type_id = $value->getFieldDefinition()
    ->getSetting('target_type');
  // Add violations on deltas with a new entity that is not valid.
  if ($new_entities) {
    if ($handler instanceof SelectionWithAutocreateInterface) {
      $valid_new_entities = $handler->validateReferenceableNewEntities($new_entities);
      $invalid_new_entities = array_diff_key($new_entities, $valid_new_entities);
    }
    else {
      // If the selection handler does not support referencing newly created
      // entities, all of them should be invalidated.
      $invalid_new_entities = $new_entities;
    }
    foreach ($invalid_new_entities as $delta => $entity) {
      $this->context
        ->buildViolation($constraint->invalidAutocreateMessage)
        ->setParameter('%type', $target_type_id)
        ->setParameter('%label', $entity->label())
        ->atPath((string) $delta . '.entity')
        ->setInvalidValue($entity)
        ->addViolation();
    }
  }
  // Add violations on deltas with a target_id that is not valid.
  if ($target_ids) {
    // Get a list of pre-existing references.
    $previously_referenced_ids = [];
    if ($entity && !$entity->isNew()) {
      $existing_entity = $this->entityTypeManager
        ->getStorage($entity->getEntityTypeId())
        ->loadUnchanged($entity->id());
      foreach ($existing_entity->{$value->getFieldDefinition()
        ->getName()}
        ->getValue() as $item) {
        $previously_referenced_ids[$item['target_id']] = $item['target_id'];
      }
    }
    $valid_target_ids = $handler->validateReferenceableEntities($target_ids);
    if ($invalid_target_ids = array_diff($target_ids, $valid_target_ids)) {
      // For accuracy of the error message, differentiate non-referenceable
      // and non-existent entities.
      $existing_entities = $this->entityTypeManager
        ->getStorage($target_type_id)
        ->loadMultiple($invalid_target_ids);
      foreach ($invalid_target_ids as $delta => $target_id) {
        // Check if any of the invalid existing references are simply not
        // accessible by the user, in which case they need to be excluded from
        // validation
        if (isset($previously_referenced_ids[$target_id]) && isset($existing_entities[$target_id]) && !$existing_entities[$target_id]->access('view')) {
          continue;
        }
        $message = isset($existing_entities[$target_id]) ? $constraint->message : $constraint->nonExistingMessage;
        $this->context
          ->buildViolation($message)
          ->setParameter('%type', $target_type_id)
          ->setParameter('%id', $target_id)
          ->atPath((string) $delta . '.target_id')
          ->setInvalidValue($target_id)
          ->addViolation();
      }
    }
  }
}