The next generation of the Teknik Services. Written in ASP.NET. https://www.teknik.io/
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20 KiB

using nClam;
using Piwik.Tracker;
using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Teknik.Areas.Error.ViewModels;
using Teknik.Areas.Upload.Models;
using Teknik.Areas.Upload.ViewModels;
using Teknik.Areas.Users.Utility;
using Teknik.Controllers;
using Teknik.Filters;
using Teknik.Utilities;
using Teknik.Models;
using Teknik.Attributes;
using System.Text;
using Org.BouncyCastle.Crypto;
namespace Teknik.Areas.Upload.Controllers
{
[TeknikAuthorize]
public class UploadController : DefaultController
{
// GET: Upload/Upload
[HttpGet]
[TrackPageView]
[AllowAnonymous]
public ActionResult Index()
{
ViewBag.Title = "Teknik Upload - End to End Encryption";
UploadViewModel model = new UploadViewModel();
model.CurrentSub = Subdomain;
using (TeknikEntities db = new TeknikEntities())
{
Users.Models.User user = UserHelper.GetUser(db, User.Identity.Name);
if (user != null)
{
model.Encrypt = user.UploadSettings.Encrypt;
model.Vaults = user.Vaults.ToList();
}
else
{
model.Encrypt = false;
}
}
return View(model);
}
[HttpPost]
[AllowAnonymous]
public ActionResult Upload(string fileType, string fileExt, string iv, int keySize, int blockSize, bool encrypt, HttpPostedFileWrapper data)
{
try
{
if (Config.UploadConfig.UploadEnabled)
{
if (data.ContentLength <= Config.UploadConfig.MaxUploadSize)
{
// convert file to bytes
int contentLength = data.ContentLength;
// Scan the file to detect a virus
if (Config.UploadConfig.VirusScanEnable)
{
ClamClient clam = new ClamClient(Config.UploadConfig.ClamServer, Config.UploadConfig.ClamPort);
clam.MaxStreamSize = Config.UploadConfig.MaxUploadSize;
ClamScanResult scanResult = clam.SendAndScanFile(data.InputStream);
switch (scanResult.Result)
{
case ClamScanResults.Clean:
break;
case ClamScanResults.VirusDetected:
return Json(new { error = new { message = string.Format("Virus Detected: {0}. As per our <a href=\"{1}\">Terms of Service</a>, Viruses are not permited.", scanResult.InfectedFiles.First().VirusName, Url.SubRouteUrl("tos", "TOS.Index")) } });
case ClamScanResults.Error:
return Json(new { error = new { message = string.Format("Error scanning the file upload for viruses. {0}", scanResult.RawResult) } });
case ClamScanResults.Unknown:
return Json(new { error = new { message = string.Format("Unknown result while scanning the file upload for viruses. {0}", scanResult.RawResult) } });
}
}
using (TeknikEntities db = new TeknikEntities())
{
Models.Upload upload = Uploader.SaveFile(db, Config, data.InputStream, fileType, contentLength, encrypt, fileExt, iv, null, keySize, blockSize);
if (upload != null)
{
if (User.Identity.IsAuthenticated)
{
Users.Models.User user = UserHelper.GetUser(db, User.Identity.Name);
if (user != null)
{
upload.UserId = user.UserId;
db.Entry(upload).State = EntityState.Modified;
db.SaveChanges();
}
}
return Json(new { result = new { name = upload.Url, url = Url.SubRouteUrl("u", "Upload.Download", new { file = upload.Url }), contentType = upload.ContentType, contentLength = StringHelper.GetBytesReadable(upload.ContentLength), deleteUrl = Url.SubRouteUrl("u", "Upload.Delete", new { file = upload.Url, key = upload.DeleteKey }) } }, "text/plain");
}
return Json(new { error = new { message = "Unable to upload file" } });
}
}
else
{
return Json(new { error = new { message = "File Too Large" } });
}
}
return Json(new { error = new { message = "Uploads are disabled" } });
}
catch (Exception ex)
{
return Json(new { error = new { message = "Exception while uploading file: " + ex.GetFullMessage(true) } });
}
}
// User did not supply key
[HttpGet]
[TrackDownload]
[AllowAnonymous]
public ActionResult Download(string file)
{
if (Config.UploadConfig.DownloadEnabled)
{
ViewBag.Title = "Teknik 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;
DateTime dateUploaded = new DateTime();
using (TeknikEntities db = new TeknikEntities())
{
Models.Upload uploads = db.Uploads.Where(up => up.Url == file).FirstOrDefault();
if (uploads != null)
{
uploads.Downloads += 1;
db.Entry(uploads).State = EntityState.Modified;
db.SaveChanges();
fileName = uploads.FileName;
url = uploads.Url;
key = uploads.Key;
iv = uploads.IV;
contentType = uploads.ContentType;
contentLength = uploads.ContentLength;
dateUploaded = uploads.DateUploaded;
}
else
{
return Redirect(Url.SubRouteUrl("error", "Error.Http404"));
}
}
// 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.FileName = file;
model.ContentType = contentType;
model.ContentLength = contentLength;
model.IV = iv;
return View(model);
}
else // We have the key, so that means server side decryption
{
// Are they downloading it by range?
bool byRange = !string.IsNullOrEmpty(Request.ServerVariables["HTTP_RANGE"]); // We do not support ranges
// Check to see if they have a cache
bool isCached = !string.IsNullOrEmpty(Request.Headers["If-Modified-Since"]);
if (isCached)
{
// The file is cached, let's just 304 this
Response.StatusCode = 304;
Response.StatusDescription = "Not Modified";
Response.AddHeader("Content-Length", "0");
return Content(string.Empty);
}
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
// check to see if we need to pass a specified range
if (byRange)
{
long anotherStart = startByte;
long anotherEnd = endByte;
string[] arr_split = Request.ServerVariables["HTTP_RANGE"].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.AddHeader("Content-Range", "bytes " + startByte + "-" + endByte + "/" + contentLength);
throw new HttpException(416, "Requested Range Not Satisfiable");
}
// 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.AddHeader("Content-Range", "bytes " + startByte + "-" + endByte + "/" + contentLength);
throw new HttpException(416, "Requested Range Not Satisfiable");
}
startByte = anotherStart;
endByte = anotherEnd;
length = endByte - startByte + 1; // Calculate new content length
// Ranges are response of 206
Response.StatusCode = 206;
}
#endregion
// Add cache parameters
Response.Cache.SetCacheability(HttpCacheability.Public);
Response.Cache.SetMaxAge(new TimeSpan(365, 0, 0, 0));
Response.Cache.SetLastModified(dateUploaded);
// We accept ranges
Response.AddHeader("Accept-Ranges", "0-" + contentLength);
// Notify the client the byte range we'll be outputting
Response.AddHeader("Content-Range", "bytes " + startByte + "-" + endByte + "/" + contentLength);
// Notify the client the content length we'll be outputting
Response.AddHeader("Content-Length", length.ToString());
// Create content disposition
var cd = new System.Net.Mime.ContentDisposition
{
FileName = url,
Inline = true
};
Response.AddHeader("Content-Disposition", cd.ToString());
// We need to prevent html (make cleaner later)
if (contentType == "text/html")
{
contentType = "text/plain";
}
// 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 FileGenerateResult(url,
contentType,
(response) => ResponseHelper.StreamToOutput(response, true, new AESCryptoStream(fs, false, keyBytes, ivBytes), (int)length, Config.UploadConfig.ChunkSize),
false);
}
else // Otherwise just send it
{
// Send the file
return new FileGenerateResult(url,
contentType,
(response) => ResponseHelper.StreamToOutput(response, true, fs, (int)length, Config.UploadConfig.ChunkSize),
false);
}
}
catch (Exception ex)
{
Logging.Logger.WriteEntry(Logging.LogLevel.Warning, "Error in Download", ex);
}
}
}
return Redirect(Url.SubRouteUrl("error", "Error.Http404"));
}
}
return Redirect(Url.SubRouteUrl("error", "Error.Http403"));
}
[HttpPost]
[AllowAnonymous]
public FileResult DownloadData(string file)
{
if (Config.UploadConfig.DownloadEnabled)
{
using (TeknikEntities db = new TeknikEntities())
{
Models.Upload upload = db.Uploads.Where(up => up.Url == file).FirstOrDefault();
if (upload != null)
{
string subDir = upload.FileName[0].ToString();
string filePath = Path.Combine(Config.UploadConfig.UploadDirectory, subDir, upload.FileName);
if (System.IO.File.Exists(filePath))
{
FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
return File(fileStream, System.Net.Mime.MediaTypeNames.Application.Octet, file);
}
}
Redirect(Url.SubRouteUrl("error", "Error.Http404"));
return null;
}
}
Redirect(Url.SubRouteUrl("error", "Error.Http403"));
return null;
}
[HttpGet]
[AllowAnonymous]
public ActionResult Delete(string file, string key)
{
using (TeknikEntities db = new TeknikEntities())
{
ViewBag.Title = "File Delete - " + file + " - " + Config.Title;
Models.Upload upload = db.Uploads.Where(up => up.Url == file).FirstOrDefault();
if (upload != null)
{
DeleteViewModel model = new DeleteViewModel();
model.File = file;
if (!string.IsNullOrEmpty(upload.DeleteKey) && upload.DeleteKey == key)
{
string filePath = upload.FileName;
// Delete from the DB
db.Uploads.Remove(upload);
db.SaveChanges();
// Delete the File
if (System.IO.File.Exists(filePath))
{
System.IO.File.Delete(filePath);
}
model.Deleted = true;
}
else
{
model.Deleted = false;
}
return View(model);
}
return RedirectToRoute("Error.Http404");
}
}
[HttpPost]
public ActionResult GenerateDeleteKey(string file)
{
using (TeknikEntities db = new TeknikEntities())
{
Models.Upload upload = db.Uploads.Where(up => up.Url == file).FirstOrDefault();
if (upload != null)
{
if (upload.User.Username == User.Identity.Name)
{
string delKey = StringHelper.RandomString(Config.UploadConfig.DeleteKeyLength);
upload.DeleteKey = delKey;
db.Entry(upload).State = EntityState.Modified;
db.SaveChanges();
return Json(new { result = new { url = Url.SubRouteUrl("u", "Upload.Delete", new { file = file, key = delKey }) } });
}
return Json(new { error = new { message = "You do not own this upload" } });
}
return Json(new { error = new { message = "Invalid URL" } });
}
}
}
}