function FileAccessControlHandler::checkFieldAccess

Overrides EntityAccessControlHandler::checkFieldAccess

File

core/modules/file/src/FileAccessControlHandler.php, line 97

Class

FileAccessControlHandler

Provides a File access control handler.

Namespace

Code

protected function checkFieldAccess($operation, FieldDefinitionInterface $field_definition, AccountInterface $account, FieldItemListInterface $items = NULL) {
    // Deny access to fields that should only be set on file creation, and
    // "status" which should only be changed based on a file's usage.
    $create_only_fields = [
        'uri',
        'filemime',
        'filesize',
    ];
    // The operation is 'edit' when the entity is being created or updated.
    // Determine if the entity is being updated by checking if it is new.
    $field_name = $field_definition->getName();
    if ($operation === 'edit' && $items && ($entity = $items->getEntity()) && !$entity->isNew() && in_array($field_name, $create_only_fields, TRUE)) {
        return AccessResult::forbidden();
    }
    // Regardless of whether the entity exists access should be denied to the
    // status field as this is managed via other APIs, for example:
    // - \Drupal\file\FileUsage\FileUsageBase::add()
    // - \Drupal\file\Plugin\EntityReferenceSelection\FileSelection::createNewEntity()
    if ($operation === 'edit' && $field_name === 'status') {
        return AccessResult::forbidden();
    }
    return parent::checkFieldAccess($operation, $field_definition, $account, $items);
}