public IActionResult Download(string id, FileViewModel data)
{
try
{
string cipher = Encryption.SymmetricDecrypt(id);
Guid guid = Guid.Parse(cipher);
var file = _fileSerive.GetFile(guid);
string absolutePath = @"ValuableFiles\" + file.file;
FileStream fs = new FileStream(absolutePath, FileMode.Open, FileAccess.Read);
MemoryStream toDownload = new MemoryStream();
fs.CopyTo(toDownload);
string email = file.email;
var member = _memberService.GetMember(email);
bool verifyData = Encryption.VerifyData(toDownload, member.publicKey, file.signature);
if (verifyData)
{
MemoryStream fileContent = Encryption.HybridDecrypt(toDownload, member.privateKey);
return(File(fileContent, "application/ocet-stream", Guid.NewGuid() + ".pdf"));
}
else
{
return(null);
}
}
catch (Exception ex)
{
_logger.LogInformation("File download not working" + ex);
return(RedirectToAction("Error", "home"));
}
}
public async Task <IActionResult> AddFile(FileViewModel uploadedform)
{
if (uploadedform.File != null)
{
long ina = uploadedform.File.Length;
ina = ina / 1024;
//ina = ina / 1024; //mb
string fsize = "";
if (ina / 1024 != 0)
{
fsize = (ina / 1024).ToString() + " mb"; // mb
}
else
{
fsize = ina.ToString() + " kb";
}
string unique = Guid.NewGuid().ToString();
// путь к папке Files
string path = "/Files/" + unique;
// сохраняем файл в папку Files в каталоге wwwroot
using (var fileStream = new FileStream(_appEnvironment.WebRootPath + path, FileMode.Create))
{
await uploadedform.File.CopyToAsync(fileStream);
}
Conference cf = db.Conferences.Find(uploadedform.ConferenceId);
MyFile file = new MyFile {
Size = fsize, Name = uploadedform.File.FileName, Path = unique, Conference = cf, ConferenceId = uploadedform.ConferenceId
};
db.MyFiles.Add(file);
db.SaveChanges();
}
return(Redirect("~/ConferenceSettings/Myfiles/" + uploadedform.ConferenceId));
}
public IActionResult Create(IFormFile file, FileViewModel data, Guid id)
{
try
{
data.task = _tasksService.GetTask(id);
if (data.task.deadline > DateTime.Now)
{
if (ModelState.IsValid)
{
string uniqueFilename;
if (System.IO.Path.GetExtension(file.FileName) == ".pdf" && file.Length < 1048576)
{
//137 80 78 71 13 10 26 10
byte[] whiteList = new byte[] { 37, 80, 68, 70 };
if (file != null)
{
MemoryStream msIn = new MemoryStream();
using (var f = file.OpenReadStream())
{
f.Position = 0;
byte[] buffer = new byte[4];
f.Read(buffer, 0, 4);
for (int i = 0; i < whiteList.Length; i++)
{
if (whiteList[i] == buffer[i])
{
}
else
{
ModelState.AddModelError("file", "file is not valid and accapteable");
return(View());
}
}
//...other reading of bytes happening
f.Position = 0;
// f.CopyTo(msIn); //hybird encrypt
//uploading the file
//correctness
uniqueFilename = Guid.NewGuid() + Path.GetExtension(file.FileName);
data.file = uniqueFilename;
string absolutePath = @"ValuableFiles\" + uniqueFilename;
try
{
var member = _memberService.GetMember(User.Identity.Name);
file.CopyTo(msIn);
var encryptedData = Encryption.HybridEncrypt(msIn, member.publicKey);
System.IO.File.WriteAllBytes(absolutePath, encryptedData.ToArray());
data.signature = Encryption.SignData(encryptedData, member.privateKey);
f.Close();
}
catch (Exception ex)
{
//log
_logger.LogError(ex, "Error happend while saving file");
return(View("Error", new ErrorViewModel()
{
Message = "Error while saving the file. Try again later"
}));
}
}
}
}
else
{
ModelState.AddModelError("file", "File is not valid and acceptable or size is greater than 10Mb");
return(View());
}
//once the file has been inserted successfully in the db
data.email = HttpContext.User.Identity.Name; //this is the currently logged in user
_fileSerive.AddFile(data);
var remoteIpAddress = Request.HttpContext.Connection.RemoteIpAddress;
_logger.LogInformation("Current user uploading in files section: " + remoteIpAddress + " TimeStamp: " + System.DateTime.Now + " User: "******" File Id: " + data.file);
TempData["message"] = "File inserted successfully";
return(View());
}
else
{
ModelState.AddModelError("", "Check your input. Operation failed");
return(View(data));
}
}
else
{
TempData["error"] = "File deadline already passes";
return(View());
}
}
catch (Exception ex)
{
_logger.LogInformation("File upload not working" + ex);
return(RedirectToAction("Error", "home"));
}
}
