public IActionResult DownloadFile(string q)
{
var fullPath = GetSafePath(q);
var rangeStart = GetByteOffset();
long fileLength = new FileInfo(fullPath).Length;
var fileStream = new EncryptStream(() => new FileStream(fullPath, FileMode.Open), this.coreEncryption, (rangeStart ?? 0) % 512);
if (rangeStart == null)
{
Response.Headers.Add("Content-Length", fileLength.ToString());
}
else
{
long startbyte = rangeStart.Value;
fileStream.Position = startbyte;
Response.StatusCode = 206;
Response.Headers.Add("Content-Length", (fileLength - startbyte).ToString());
string contentRange = string.Format("bytes {0}-{1}/{2}", startbyte, fileLength - 1, fileLength);
Response.Headers.Add("Content-Range", contentRange);
}
Response.Headers.Add("Accept-Ranges", "bytes");
return(File(fileStream, "application/unknown", fileNameHelper.CreateAlternativeFileName(q) + extension));
}