public HttpResponseMessage GetFileInfo(FileInVm vm)
        {
            if (vm == null)
            {
                vm = new FileInVm();
            }

            var appName = GetAppNameByGuid(vm.AppGuid);
            var stream  = _sourceProvider.GetFileStream(appName);

            return(Request.CreateResponse(HttpStatusCode.OK, new FileOutVm(GetHash(stream), appName)));
        }