public static void HandleUploadFullfillment(Payload inbound, Payload outbound)
{
var context = new SmartShareContext();
var queryResult = from s in context.Storage
where s.FileHash.Contains(inbound.Status)
select s;
//File GUID not found in database.
if (queryResult.Count() == 0)
{
outbound.Status = Core.Config.ServerError;
}
//GUID found.
else
{
var updatedFile = queryResult.First();
updatedFile.TimeCreated = DateTime.Now;
updatedFile.TimeExpiring = updatedFile.TimeCreated + inbound.TimeLeft;
context.Storage.Update(updatedFile);
context.SaveChanges();
Core.Util.WriteBase64StringToFile(
inbound.Base64FileData,
Server.Config.StorageRoot + updatedFile.FileHash
);
outbound.Status = Core.Config.ServerSuccess;
}
}
static void HandleDownload(NetworkStream stream, FileRequestInfo requestInfo)
{
var context = new SmartShareContext();
var file = context.UploadedFiles.First(x => x.Name == requestInfo.FileName);
if (file == null)
{
stream.Write(new byte[] { FAIL_BYTE });
return;
}
if (!(file.Password == requestInfo.Password))
{
stream.Write(new byte[] { FAIL_BYTE });
return;
}
if (file.DownloadsExceeded() || file.IsExpired())
{
stream.Write(new byte[] { FAIL_BYTE });
stream.Close();
file.Delete(context);
return;
}
stream.Write(new byte[] { ACK_BYTE });
file.DownloadCount++;
context.UploadedFiles.Update(file);
context.SaveChanges();
var connection = context.Database.GetDbConnection();
if (connection is NpgsqlConnection)
{
var conn = (NpgsqlConnection)connection;
conn.Open();
var blobManager = new NpgsqlLargeObjectManager(conn);
using (var transaction = connection.BeginTransaction())
{
var blobStream = blobManager.OpenRead(file.BlobOid);
blobStream.CopyTo(stream);
transaction.Commit();
}
conn.Close();
Console.WriteLine("Download successful.");
}
else
{
throw new NotSupportedException("Unsupported database adapter.");
}
}
public static void HandleDownloadRequest(Payload inbound, Payload outbound)
{
var context = new SmartShareContext();
var queryResult = from s in context.Storage
where s.Filename.Contains(inbound.Filename)
select s;
//File doesn't exist or user doesn't have correct password.
if (queryResult.Count() == 0 || queryResult.First().Password != inbound.Password)
{
outbound.Status = Core.Config.ServerError;
}
//File exists and user has correct password.
else
{
var fileRecord = queryResult.First();
//File hasn't expired or reached max downloads.
//Return file and update downloads left.
if (fileRecord.TimeExpiring > DateTime.Now &&
fileRecord.DownloadsRemaining != 0)
{
outbound.Base64FileData = Core.Util.FileToBase64String(
Server.Config.StorageRoot + fileRecord.FileHash
);
outbound.Status = Core.Config.ServerSuccess;
if (fileRecord.DownloadsRemaining != Core.Config.OptionUnlimitedDownload)
{
fileRecord.DownloadsRemaining--;
}
context.Storage.Update(fileRecord);
}
//File has expired or reache max downloads.
//Delete file and update record.
else
{
outbound.Status = Core.Config.ServerError;
File.Delete(Server.Config.StorageRoot + fileRecord.FileHash);
context.Storage.Remove(fileRecord);
}
context.SaveChanges();
}
}
public static void HandleUploadRequest(Payload inbound, Payload outbound)
{
var context = new SmartShareContext();
var queryResult = from s in context.Storage
where s.Filename.Contains(inbound.Filename)
select s;
if (queryResult.Count() == 0)
{
//File doesn't exist, add initial entry.
var newFile = new StorageModel();
newFile.Filename = inbound.Filename;
newFile.FileHash = Guid.NewGuid().ToString();
newFile.DownloadsRemaining = (inbound.DownloadsLeft > 0)
? inbound.DownloadsLeft
: Core.Config.DefaultDownloadLimit;
newFile.Password = inbound.Password;
//newFile.TimeCreated and newFile.TimeExpiring will be added
//upon file receipt.
context.Storage.Add(newFile);
context.SaveChanges();
//Prepare authorization response.
outbound.Status = newFile.FileHash;
if (inbound.TimeLeft < Core.Config.MinLifetime)
{
outbound.TimeLeft = Core.Config.DefaultLifetime;
}
else if (inbound.TimeLeft > Core.Config.MaxLifetime)
{
outbound.TimeLeft = Core.Config.MaxLifetime;
}
else
{
outbound.TimeLeft = inbound.TimeLeft;
}
}
else
{
outbound.Status = Core.Config.ServerError;
}
}
public static bool SaveToDb(FileRequest request)
{
File file = MapFileRequestToFileEntity(request);
using (var context = new SmartShareContext())
{
try
{
context.Files.Add(file);
context.SaveChanges();
return(true);
}
catch (Exception)
{
Console.WriteLine("File Already Exist, Please try a Different Filename to Upload");
return(false);
}
}
}
public static bool SaveTextToDb(FileRequest requestObj)
{
DownloadFile filerequest = mapTextRequestToTextEntity(requestObj);
using (SmartShareContext context = new SmartShareContext())
{
try
{
context.FilesIn.Add(filerequest);
context.SaveChanges();
return(true);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
Console.WriteLine(e.StackTrace);
return(false);
}
}
}
public static void HandleInfoRequest(Payload inbound, Payload outbound)
{
var context = new SmartShareContext();
var queryResult = from s in context.Storage
where s.Filename.Contains(inbound.Filename)
select s;
//File not found or incorrect password provided.
if (queryResult.Count() == 0 || queryResult.First().Password != inbound.Password)
{
outbound.Status = Core.Config.ServerError;
}
//File found and correct password provided.
else
{
var fileRecord = queryResult.First();
//File not expired or over download limit.
//Return file info.
if (fileRecord.TimeExpiring > DateTime.Now &&
fileRecord.DownloadsRemaining != 0)
{
outbound.TimeCreated = fileRecord.TimeCreated;
outbound.TimeLeft = fileRecord.TimeExpiring - DateTime.Now;
outbound.DownloadsLeft = fileRecord.DownloadsRemaining;
outbound.Status = Core.Config.ServerSuccess;
}
//File expired or over download limit.
//Delete file.
else
{
outbound.Status = Core.Config.ServerError;
File.Delete(Server.Config.StorageRoot + fileRecord.FileHash);
context.Storage.Remove(fileRecord);
context.SaveChanges();
}
}
}
private static void HandleView(NetworkStream stream, FileRequestInfo requestInfo)
{
var context = new SmartShareContext();
var file = context.UploadedFiles.First(x => x.Name == requestInfo.FileName);
if (!(file.Password == requestInfo.Password))
{
return;
}
if (file.DownloadsExceeded() || file.IsExpired())
{
stream.Close();
file.Delete(context);
return;
}
var view = file.CreateView();
var responseSerializer = new XmlSerializer(typeof(FileView));
responseSerializer.Serialize(stream, view);
}
static void HandleClient(TcpClient client)
{
using (var stream = client.GetStream())
{
var payloadSerializer = new XmlSerializer(typeof(Payload));
var inbound = (Payload)payloadSerializer.Deserialize(stream);
var outbound = new Payload();
var context = new SmartShareContext();
//Client requested upload authorization.
if (inbound.Status == Core.Config.RequestUpload)
{
HandleUploadRequest(inbound, outbound);
}
//Client requested download.
else if (inbound.Status == Core.Config.RequestDownload)
{
HandleDownloadRequest(inbound, outbound);
}
//Client requested file info.
else if (inbound.Status == Core.Config.RequestInfo)
{
HandleInfoRequest(inbound, outbound);
}
//Client passed authorization. Create file and update record.
else
{
HandleUploadFullfillment(inbound, outbound);
}
//Send response to client.
payloadSerializer.Serialize(stream, outbound);
client.Close();
}
}
private static String ViewDB(FileRequest request)
{
File file = MapFileRequestToFileEntity(request);
using (var context = new SmartShareContext())
{
try
{
var Dbfiles = context.Files;
var FileView = (from f in Dbfiles
where f.FileName == file.FileName
select f).First();
return(FileView.ToString());
}
catch (Exception e)
{
Console.WriteLine(e.StackTrace);
}
return("File Does Not Exist");
}
}
static void Main(string[] args)
{
XmlSerializer fromClientDeserialize = new XmlSerializer(typeof(ClientToServerDTO));
ClientToServerDTO fromClientDTO = new ClientToServerDTO();
IPEndPoint ingress = new IPEndPoint(0, 1234);
SmartShareContext DBContext = new SmartShareContext();
TcpListener mainSocket = new TcpListener(ingress);
mainSocket.Server.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
mainSocket.Start();
while (true)
{
try
{
TcpClient clientConnection = mainSocket.AcceptTcpClient();
Console.WriteLine("Connection Received");
Task.Run(() =>
{
SmartShareContext dbContext = new SmartShareContext();
DbSet <SmartShareFile> smartShareFileTable = dbContext.SmartShareFileTable;
SmartShareFile newDataEntry = new SmartShareFile();
using (NetworkStream stream = clientConnection.GetStream())
{
fromClientDTO = (ClientToServerDTO)fromClientDeserialize.Deserialize(stream);
bool exists = (from i in smartShareFileTable where i.Filename == fromClientDTO.Filename select i).Any();
if (fromClientDTO.UserAction == UserAction.upload)
{
if (!exists)
{
newDataEntry.Filename = fromClientDTO.Filename;
newDataEntry.Password = fromClientDTO.Password;
newDataEntry.MaximumDownloads = fromClientDTO.MaxDown;
newDataEntry.Expiration = fromClientDTO.Expiration;
newDataEntry.DownloadCount = 0;
newDataEntry.FileData = fromClientDTO.FileData;
dbContext.Add(newDataEntry);
dbContext.SaveChanges();
}
}
if (fromClientDTO.UserAction == UserAction.download || fromClientDTO.UserAction == UserAction.view)
{
XmlSerializer toClientSerialize = new XmlSerializer(typeof(ServerToClientDTO));
ServerToClientDTO toClientDTO = new ServerToClientDTO();
if (exists)
{
SmartShareFile fetchedDownload = (from i in smartShareFileTable
where i.Filename == fromClientDTO.Filename
select i).First();
if (fetchedDownload.Password == fromClientDTO.Password && DateTime.Parse(fetchedDownload.Expiration) > DateTime.Now && fetchedDownload.DownloadCount < fetchedDownload.MaximumDownloads)
{
toClientDTO.Filename = fetchedDownload.Filename;
toClientDTO.MaxDown = fetchedDownload.MaximumDownloads;
toClientDTO.DownCount = ++fetchedDownload.DownloadCount;
toClientDTO.Expiration = fetchedDownload.Expiration;
toClientDTO.FileData = fetchedDownload.FileData;
toClientDTO.Created = fetchedDownload.Created;
if (fromClientDTO.UserAction != UserAction.view)
{
dbContext.Update(fetchedDownload);
dbContext.SaveChanges();
}
--toClientDTO.DownCount;
toClientSerialize.Serialize(stream, toClientDTO);
}
else if (DateTime.Parse(fetchedDownload.Expiration) <= DateTime.Now || fetchedDownload.MaximumDownloads <= fetchedDownload.DownloadCount)
{
dbContext.SmartShareFileTable.Remove(fetchedDownload);
dbContext.SaveChanges();
}
}
}
}
dbContext.Dispose();
});
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
}
private static bool CheckDb(FileRequest request)
{
File file = MapFileRequestToFileEntity(request);
using (var context = new SmartShareContext())
{
try
{
var Dbfiles = context.Files;
var findFile = (from f in Dbfiles
where f.FileName == file.FileName
select f).Any();
var ifdownloadReached = (from f in Dbfiles
where f.TotalDownload == f.MaxDownload
select f).Any();
var isExpired = (from f in Dbfiles
where DateTime.Compare(f.Expiration, DateTime.Now) < 0
select f).Any();
var isPassword = (from f in Dbfiles
where f.Password.Equals(file.Password)
select f).Any();
if (isExpired || ifdownloadReached)
{
var todelete = (from f in Dbfiles
where f.FileName.Equals(file.FileName)
select f).First();
Dbfiles.Remove(todelete);
context.SaveChanges();
return(false);
}
if (!isPassword)
{
return(false);
}
if (findFile)
{
var increasetotal = (from f in Dbfiles
where f.FileName == file.FileName
select f).FirstOrDefault();
increasetotal.TotalDownload++;
context.Files.Update(increasetotal);
context.SaveChanges();
return(true);
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
Console.WriteLine(e.StackTrace);
return(false);
}
return(false);
}
}
static void HandleUpload(NetworkStream stream, FileRequestInfo requestInfo)
{
var context = new SmartShareContext();
var connection = context.Database.GetDbConnection();
// check if file already exists, and if that file is expired we can delete it and continue the upload.
try
{
var possibleFile = context.UploadedFiles.First(x => x.Name == requestInfo.FileName);
if (possibleFile != null)
{
if (possibleFile.DownloadsExceeded() || possibleFile.IsExpired())
{
possibleFile.Delete(context);
}
else
{
return;
}
}
}
catch (InvalidOperationException e)
{
Console.WriteLine("File table is empty");
}
stream.Write(new byte[1] {
ACK_BYTE
}); // let client know we're ready to receive
if (connection is NpgsqlConnection)
{
var blobManager = new NpgsqlLargeObjectManager((NpgsqlConnection)connection);
uint oid;
connection.Open();
using (var transaction = connection.BeginTransaction())
{
oid = blobManager.Create();
using (var blobStream = blobManager.OpenReadWrite(oid))
{
stream.CopyTo(blobStream);
}
transaction.Commit();
}
stream.Close();
connection.Close();
Console.WriteLine("Upload successful.");
var uploadedFile = new UploadedFile(requestInfo, oid);
context.Add(uploadedFile);
context.SaveChanges();
}
else
{
throw new NotSupportedException("Unsupported database adapter");
}
}
