silverstripe / silverstripe-asset-admin

        $file = Injector::inst()->create($fileClass);

        // check canCreate permissions

        if (!$file->canCreate(null, $data)) {

            $result = ['message' => [

                'type' => 'error',

                'value' => _t(

                    'SilverStripe\\AssetAdmin\\Controller\\AssetAdmin.CreatePermissionDenied',

                    'You do not have permission to add files'

                )

            ]];

            return (new HTTPResponse(json_encode($result), 403))

                ->addHeader('Content-Type', 'application/json');

        }

        $uploadResult = $upload->loadIntoFile($tmpFile, $file, $parentRecord ? $parentRecord->getFilename() : '/');

        if(!$uploadResult) {

        }

        $uploadResult = $upload->loadIntoFile($tmpFile, $file, $parentRecord ? $parentRecord->getFilename() : '/');

        if(!$uploadResult) {

            $result = ['message' => [

                'type' => 'error',

                'value' => _t(

                    'SilverStripe\\AssetAdmin\\Controller\\AssetAdmin.LoadIntoFileFailed',

                    'Failed to load file'

                )

            ]];

            return (new HTTPResponse(json_encode($result), 400))

                ->addHeader('Content-Type', 'application/json');

        }

        $file->ParentID = $parentRecord ? $parentRecord->ID : 0;

        $file->write();