The next generation of the Teknik Services. Written in ASP.NET. https://www.teknik.io/
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using nClam;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
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 Teknik.Utilities.Cryptography;
using Teknik.Data;
using Teknik.Configuration;
using Microsoft.Extensions.Logging;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Authorization;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;
using Microsoft.AspNetCore.Http;
using Teknik.Logging;
using Teknik.Areas.Users.Models;
namespace Teknik.Areas.Upload.Controllers
{
[Authorize]
[Area("Upload")]
public class UploadController : DefaultController
{
public UploadController(ILogger<Logger> logger, Config config, TeknikEntities dbContext) : base(logger, config, dbContext) { }
[HttpGet]
[AllowAnonymous]
[TrackPageView]
public async Task<IActionResult> Index()
{
ViewBag.Title = "Upload Files";
UploadViewModel model = new UploadViewModel();
model.CurrentSub = Subdomain;
model.Encrypt = false;
model.ExpirationLength = 1;
model.ExpirationUnit = ExpirationUnit.Days;
model.MaxUploadSize = _config.UploadConfig.MaxUploadSize;
if (User.Identity.IsAuthenticated)
{
User user = UserHelper.GetUser(_dbContext, User.Identity.Name);
if (user != null)
{
model.Encrypt = user.UploadSettings.Encrypt;
model.ExpirationLength = user.UploadSettings.ExpirationLength;
model.ExpirationUnit = user.UploadSettings.ExpirationUnit;
model.Vaults = user.Vaults.ToList();
model.MaxUploadSize = _config.UploadConfig.MaxUploadSizeBasic;
IdentityUserInfo userInfo = await IdentityHelper.GetIdentityUserInfo(_config, User.Identity.Name);
if (userInfo.AccountType == AccountType.Premium)
{
model.MaxUploadSize = _config.UploadConfig.MaxUploadSizePremium;
}
}
}
return View(model);
}
[HttpPost]
[AllowAnonymous]
[DisableRequestSizeLimit]
public async Task<IActionResult> Upload([FromForm] UploadFileViewModel uploadFile)
{
try
{
if (_config.UploadConfig.UploadEnabled)
{
long maxUploadSize = _config.UploadConfig.MaxUploadSize;
if (User.Identity.IsAuthenticated)
{
maxUploadSize = _config.UploadConfig.MaxUploadSizeBasic;
IdentityUserInfo userInfo = await IdentityHelper.GetIdentityUserInfo(_config, User.Identity.Name);
if (userInfo.AccountType == AccountType.Premium)
{
maxUploadSize = _config.UploadConfig.MaxUploadSizePremium;
}
}
else
{
// Non-logged in users are defaulted to 1 day expiration
uploadFile.options.ExpirationUnit = ExpirationUnit.Days;
uploadFile.options.ExpirationLength = 1;
}
if (uploadFile.file.Length <= maxUploadSize)
{
// convert file to bytes
long contentLength = uploadFile.file.Length;
// Scan the file to detect a virus
if (_config.UploadConfig.VirusScanEnable)
{
using (Stream fs = uploadFile.file.OpenReadStream())
{
ClamClient clam = new ClamClient(_config.UploadConfig.ClamServer, _config.UploadConfig.ClamPort);
clam.MaxStreamSize = maxUploadSize;
ClamScanResult scanResult = await clam.SendAndScanFileAsync(fs);
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) } });
}
}
}
// Check content type restrictions (Only for encrypting server side
if (!uploadFile.options.Encrypt)
{
if (_config.UploadConfig.RestrictedContentTypes.Contains(uploadFile.fileType) || _config.UploadConfig.RestrictedExtensions.Contains(uploadFile.fileExt))
{
return Json(new { error = new { message = "File Type Not Allowed" } });
}
}
using (Stream fs = uploadFile.file.OpenReadStream())
{
Models.Upload upload = UploadHelper.SaveFile(_dbContext,
_config,
fs,
uploadFile.fileType,
contentLength,
!uploadFile.options.Encrypt,
uploadFile.options.ExpirationUnit,
uploadFile.options.ExpirationLength,
uploadFile.fileExt,
uploadFile.iv, null,
uploadFile.keySize,
uploadFile.blockSize);
if (upload != null)
{
if (User.Identity.IsAuthenticated)
{
Users.Models.User user = UserHelper.GetUser(_dbContext, User.Identity.Name);
if (user != null)
{
upload.UserId = user.UserId;
_dbContext.Entry(upload).State = EntityState.Modified;
_dbContext.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.DeleteByKey", new { file = upload.Url, key = upload.DeleteKey }),
expirationUnit = uploadFile.options.ExpirationUnit.ToString(),
expirationLength = uploadFile.options.ExpirationLength
} });
}
}
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) } });
}
}
[HttpGet]
[AllowAnonymous]
[TrackPageView]
[ResponseCache(Duration = 31536000, Location = ResponseCacheLocation.Any)]
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))
{
_dbContext.Uploads.Remove(upload);
_dbContext.SaveChanges();
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);
}
[HttpPost]
[AllowAnonymous]
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))
{
_dbContext.Uploads.Remove(upload);
_dbContext.SaveChanges();
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" } });
}
[HttpGet]
[AllowAnonymous]
public IActionResult DeleteByKey(string file, string key)
{
ViewBag.Title = "File Delete | " + file ;
Models.Upload upload = _dbContext.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
_dbContext.Uploads.Remove(upload);
_dbContext.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 new StatusCodeResult(StatusCodes.Status404NotFound);
}
[HttpPost]
public IActionResult GenerateDeleteKey(string file)
{
Models.Upload upload = _dbContext.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;
_dbContext.Entry(upload).State = EntityState.Modified;
_dbContext.SaveChanges();
return Json(new { result = new { url = Url.SubRouteUrl("u", "Upload.DeleteByKey", 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" } });
}
[HttpPost]
public IActionResult Delete(string id)
{
Models.Upload foundUpload = _dbContext.Uploads.Where(u => u.Url == id).FirstOrDefault();
if (foundUpload != null)
{
if (foundUpload.User.Username == User.Identity.Name)
{
string filePath = foundUpload.FileName;
// Delete from the DB
_dbContext.Uploads.Remove(foundUpload);
_dbContext.SaveChanges();
// Delete the File
if (System.IO.File.Exists(filePath))
{
System.IO.File.Delete(filePath);
}
return Json(new { result = true });
}
return Json(new { error = new { message = "You do not have permission to edit this Paste" } });
}
return Json(new { error = new { message = "This Paste does not exist" } });
}
}
}