public IActionResult DownloadData(string file, bool decrypt)
{
if (_config.UploadConfig.DownloadEnabled)
{
Models.Upload upload = _dbContext.Uploads.Where(up => up.Url == file).FirstOrDefault();
if (upload != null)
{
// Check Expiration
if (UploadHelper.CheckExpiration(upload))
{
DeleteFile(upload);
return(Json(new { error = new { message = "File Does Not Exist" } }));
}
string subDir = upload.FileName[0].ToString();
string filePath = Path.Combine(_config.UploadConfig.UploadDirectory, subDir, upload.FileName);
if (System.IO.File.Exists(filePath))
{
// Notify the client the content length we'll be outputting
Response.Headers.Add("Content-Length", upload.ContentLength.ToString());
// Create content disposition
var cd = new System.Net.Mime.ContentDisposition
{
FileName = upload.Url,
Inline = true
};
// Set the content type of this response
Response.Headers.Add("Content-Type", upload.ContentType);
Response.Headers.Add("Content-Disposition", cd.ToString());
// Read in the file
FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);
// If the IV is set, and Key is set, then decrypt it while sending
if (decrypt && !string.IsNullOrEmpty(upload.Key) && !string.IsNullOrEmpty(upload.IV))
{
byte[] keyBytes = Encoding.UTF8.GetBytes(upload.Key);
byte[] ivBytes = Encoding.UTF8.GetBytes(upload.IV);
return(new BufferedFileStreamResult(upload.ContentType, (response) => ResponseHelper.StreamToOutput(response, true, new AesCounterStream(fs, false, keyBytes, ivBytes), (int)upload.ContentLength, _config.UploadConfig.ChunkSize), false));
}
else // Otherwise just send it
{
// Send the file
return(new BufferedFileStreamResult(upload.ContentType, (response) => ResponseHelper.StreamToOutput(response, true, fs, (int)upload.ContentLength, _config.UploadConfig.ChunkSize), false));
}
}
}
return(Json(new { error = new { message = "File Does Not Exist" } }));
}
return(Json(new { error = new { message = "Downloads are disabled" } }));
}
public async Task <IActionResult> Download(string file)
{
if (_config.UploadConfig.DownloadEnabled)
{
ViewBag.Title = "Download " + file;
string fileName = string.Empty;
string url = string.Empty;
string key = string.Empty;
string iv = string.Empty;
string contentType = string.Empty;
long contentLength = 0;
bool premiumAccount = false;
DateTime dateUploaded = new DateTime();
Models.Upload upload = _dbContext.Uploads.Where(up => up.Url == file).FirstOrDefault();
if (upload != null)
{
// Check Expiration
if (UploadHelper.CheckExpiration(upload))
{
DeleteFile(upload);
return(new StatusCodeResult(StatusCodes.Status404NotFound));
}
upload.Downloads += 1;
_dbContext.Entry(upload).State = EntityState.Modified;
_dbContext.SaveChanges();
fileName = upload.FileName;
url = upload.Url;
key = upload.Key;
iv = upload.IV;
contentType = upload.ContentType;
contentLength = upload.ContentLength;
dateUploaded = upload.DateUploaded;
if (User.Identity.IsAuthenticated)
{
IdentityUserInfo userInfo = await IdentityHelper.GetIdentityUserInfo(_config, User.Identity.Name);
premiumAccount = userInfo.AccountType == AccountType.Premium;
}
if (!premiumAccount && upload.User != null)
{
IdentityUserInfo userInfo = await IdentityHelper.GetIdentityUserInfo(_config, upload.User.Username);
premiumAccount = userInfo.AccountType == AccountType.Premium;
}
}
else
{
return(new StatusCodeResult(StatusCodes.Status404NotFound));
}
// We don't have the key, so we need to decrypt it client side
if (string.IsNullOrEmpty(key) && !string.IsNullOrEmpty(iv))
{
DownloadViewModel model = new DownloadViewModel();
model.CurrentSub = Subdomain;
model.FileName = file;
model.ContentType = contentType;
model.ContentLength = contentLength;
model.IV = iv;
model.Decrypt = true;
return(View(model));
}
else if (!premiumAccount && _config.UploadConfig.MaxDownloadSize < contentLength)
{
// We want to force them to the dl page due to them being over the max download size for embedded content
DownloadViewModel model = new DownloadViewModel();
model.CurrentSub = Subdomain;
model.FileName = file;
model.ContentType = contentType;
model.ContentLength = contentLength;
model.Decrypt = false;
return(View(model));
}
else // We have the key, so that means server side decryption
{
// Check for the cache
bool isCached = false;
string modifiedSince = Request.Headers["If-Modified-Since"];
if (!string.IsNullOrEmpty(modifiedSince))
{
DateTime modTime = new DateTime();
bool parsed = DateTime.TryParse(modifiedSince, out modTime);
if (parsed)
{
if ((modTime - dateUploaded).TotalSeconds <= 1)
{
isCached = true;
}
}
}
if (isCached)
{
return(new StatusCodeResult(StatusCodes.Status304NotModified));
}
else
{
string subDir = fileName[0].ToString();
string filePath = Path.Combine(_config.UploadConfig.UploadDirectory, subDir, fileName);
long startByte = 0;
long endByte = contentLength - 1;
long length = contentLength;
if (System.IO.File.Exists(filePath))
{
#region Range Calculation
// Are they downloading it by range?
bool byRange = !string.IsNullOrEmpty(Request.Headers["Range"]); // We do not support ranges
// check to see if we need to pass a specified range
if (byRange)
{
long anotherStart = startByte;
long anotherEnd = endByte;
string[] arr_split = Request.Headers["Range"].ToString().Split(new char[] { '=' });
string range = arr_split[1];
// Make sure the client hasn't sent us a multibyte range
if (range.IndexOf(",") > -1)
{
// (?) Shoud this be issued here, or should the first
// range be used? Or should the header be ignored and
// we output the whole content?
Response.Headers.Add("Content-Range", "bytes " + startByte + "-" + endByte + "/" + contentLength);
return(new StatusCodeResult(StatusCodes.Status416RequestedRangeNotSatisfiable));
}
// If the range starts with an '-' we start from the beginning
// If not, we forward the file pointer
// And make sure to get the end byte if spesified
if (range.StartsWith("-"))
{
// The n-number of the last bytes is requested
anotherStart = startByte - Convert.ToInt64(range.Substring(1));
}
else
{
arr_split = range.Split(new char[] { '-' });
anotherStart = Convert.ToInt64(arr_split[0]);
long temp = 0;
anotherEnd = (arr_split.Length > 1 && Int64.TryParse(arr_split[1].ToString(), out temp)) ? Convert.ToInt64(arr_split[1]) : contentLength;
}
/* Check the range and make sure it's treated according to the specs.
* http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
*/
// End bytes can not be larger than $end.
anotherEnd = (anotherEnd > endByte) ? endByte : anotherEnd;
// Validate the requested range and return an error if it's not correct.
if (anotherStart > anotherEnd || anotherStart > contentLength - 1 || anotherEnd >= contentLength)
{
Response.Headers.Add("Content-Range", "bytes " + startByte + "-" + endByte + "/" + contentLength);
return(new StatusCodeResult(StatusCodes.Status416RequestedRangeNotSatisfiable));
}
startByte = anotherStart;
endByte = anotherEnd;
length = endByte - startByte + 1; // Calculate new content length
// Ranges are response of 206
Response.StatusCode = 206;
}
#endregion
// Set Last Modified
Response.GetTypedHeaders().LastModified = dateUploaded;
// We accept ranges
Response.Headers.Add("Accept-Ranges", "0-" + contentLength);
// Notify the client the byte range we'll be outputting
Response.Headers.Add("Content-Range", "bytes " + startByte + "-" + endByte + "/" + contentLength);
// Notify the client the content length we'll be outputting
Response.Headers.Add("Content-Length", length.ToString());
// Set the content type of this response
Response.Headers.Add("Content-Type", contentType);
// Create content disposition
var cd = new System.Net.Mime.ContentDisposition
{
FileName = url,
Inline = true
};
Response.Headers.Add("Content-Disposition", cd.ToString());
// Read in the file
FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);
// Reset file stream to starting position (or start of range)
fs.Seek(startByte, SeekOrigin.Begin);
try
{
// If the IV is set, and Key is set, then decrypt it while sending
if (!string.IsNullOrEmpty(key) && !string.IsNullOrEmpty(iv))
{
byte[] keyBytes = Encoding.UTF8.GetBytes(key);
byte[] ivBytes = Encoding.UTF8.GetBytes(iv);
return(new BufferedFileStreamResult(contentType, async(response) => await ResponseHelper.StreamToOutput(response, true, new AesCounterStream(fs, false, keyBytes, ivBytes), (int)length, _config.UploadConfig.ChunkSize), false));
}
else // Otherwise just send it
{
// Send the file
return(new BufferedFileStreamResult(contentType, async(response) => await ResponseHelper.StreamToOutput(response, true, fs, (int)length, _config.UploadConfig.ChunkSize), false));
}
}
catch (Exception ex)
{
_logger.LogWarning(ex, "Error in Download: {url}", new { url });
}
}
}
return(new StatusCodeResult(StatusCodes.Status404NotFound));
}
}
return(new StatusCodeResult(StatusCodes.Status403Forbidden));
}