public async Task <ActionResult> DrawingPdf(string projectName, string hash, int index, string token = null)
{
string localFileName = await _userResolver.EnsureLocalFile(projectName, LocalName.DrawingPdf(index), hash);
return(new PhysicalFileResult(localFileName, "application/pdf")
{
FileDownloadName = LocalName.DrawingPdf(index)
});
}