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();
            }
        }
    }
}