/// <summary>
/// Sends the outgoing message
/// </summary>
/// <param name="message">The message string</param>
/// <param name="id">The message string</param>
public async void SendMessage(string message, string id)
{
// encrypt the message with other user's key
string encryptedMessage;
{
string key = (await SharedStuff.Database.Table <DatabaseHelper.Users>().Where(user => user.Username == Username)
.FirstAsync()).Key;
encryptedMessage = BouncyCastleHelper.AesGcmEncrypt(message, key);
}
// create json
string json = JsonConvert.SerializeObject(new JsonTypes.SendMessage
{
Type = 0,
Id = id,
Payload = new JsonTypes.SendMessagePayload
{
To = Username,
Message = encryptedMessage
}
});
// send the json
SharedStuff.Websocket.SendAsync(json, ok =>
{
SharedStuff.Database.InsertAsync(new DatabaseHelper.Messages
{
Date = DateTime.Now,
MyMessage = true,
Payload = message,
Type = 0,
Username = Username
}).Wait();
});
// add to main window
Application.Current.Dispatcher.Invoke(delegate
{
var u = MainChatsWindow.MessagesList.First(x => x.Username == Username);
u.Message = message;
u.IsLastMessageForUser = true;
});
}
private async void OpenFileClicked(object sender, RoutedEventArgs e)
{
if (sender is Button btn)
{
if (btn.CommandParameter is string token)
{
DatabaseHelper.Files f = new DatabaseHelper.Files();
try
{
f = await SharedStuff.Database.Table <DatabaseHelper.Files>()
.Where(file => file.Token == token).FirstAsync();
if (string.IsNullOrEmpty(f.Location))
{
throw new InvalidOperationException();
}
if (f.Location == " ") // null means the file is not downloaded. ' ' means it does not exists
{
throw new FileNotFoundException();
}
if (File.Exists(f.Location)) // check if the downloaded file exists
{
System.Diagnostics.Process.Start(f.Location);
}
else
{
await SharedStuff.Database.ExecuteAsync(
"UPDATE Files SET Location = ? WHERE Token = ?"
, " ", token);
throw new FileNotFoundException();
}
}
catch (FileNotFoundException)
{
// at first check if server has the file
var err = new ErrorDialogSample
{
ErrorText =
{
Text =
"This file does not exists on your computer. Ask other user to send this file again."
},
ErrorTitle = { Text = "Cannot Open File" }
};
await DialogHost.Show(err, "ChatDialogHost" + Username);
}
catch (InvalidOperationException) // this token does not exists in database
{
// download this file
await Application.Current.Dispatcher.Invoke(async delegate
{
ProgressBar bar = ((StackPanel)((DockPanel)((Button)sender).Parent).Parent)
.Children[1] as ProgressBar;
try
{
string downloadFileUrl =
$"https://{Properties.Settings.Default.ServerAddress}/download?token={token}"; // token does not contain special characters so we are good
string destinationFilePath = Path.GetTempFileName();
using (var client =
new HttpClientDownloadWithProgress(downloadFileUrl, destinationFilePath))
{
client.ProgressChanged +=
(totalFileSize, totalBytesDownloaded, progressPercentage) =>
{
bar.Value = progressPercentage ?? 0;
};
await client.StartDownload();
}
// get the key
string key = (await SharedStuff.Database.Table <DatabaseHelper.Users>()
.Where(user => user.Username == Username).FirstAsync()).Key;
BouncyCastleHelper.AesGcmDecrypt(new FileInfo(destinationFilePath),
new FileInfo(Path.Combine(SharedStuff.DownloadPath, f.Name)), key);
await SharedStuff.Database.ExecuteAsync(
"UPDATE Files SET Location = ? WHERE Token = ?"
, Path.Combine(SharedStuff.DownloadPath, f.Name), token);
}
catch (FileNotFoundException) // This error means that the files does not exists on server. (it's too old)
{
await SharedStuff.Database.ExecuteAsync(
"UPDATE Files SET Location = ? WHERE Token = ?"
, " ", token); // this will make the File.Exists always return false
MessagesList.First(msg => msg.Token == token).DownloadButtonIcon =
PackIconKind.DownloadOff;
var err = new ErrorDialogSample
{
ErrorText =
{
Text = "This file is too old and could not be downloaded. Ask other user to send this file again."
},
ErrorTitle = { Text = "Cannot Download File" }
};
await DialogHost.Show(err, "ChatDialogHost" + Username);
}
catch (Exception ex)
{
var err = new ErrorDialogSample
{
ErrorText =
{
Text = ex.Message
},
ErrorTitle = { Text = "Cannot Download File" }
};
await DialogHost.Show(err, "ChatDialogHost" + Username);
}
finally
{
bar.Value = 101;
}
});
}
}
}
}
/// <summary>
/// Encrypts and uploads a file to server
/// </summary>
/// <param name="guid">The ID of message</param>
public static async void UploadFile(string guid)
{
// at first encrypt the file
var encryptedFile = new FileInfo(Path.GetTempFileName());
string username = PendingMessages[guid].With;
string key = (await Database.Table <DatabaseHelper.Users>()
.Where(user => user.Username == username).FirstAsync()).Key;
await Task.Run(() =>
BouncyCastleHelper.AesGcmEncrypt(new FileInfo(PendingMessages[guid].FilePath),
encryptedFile, key));
// now upload the file
try
{
using (HttpClient localClient = new HttpClient())
using (var multiForm = new MultipartFormDataContent())
{
localClient.Timeout = TimeSpan.FromMinutes(15); // You may need this if you are uploading a big file
var file = new ProgressableStreamContent(
new StreamContent(encryptedFile.OpenRead())
, (sent, total) => { });
multiForm.Add(file, "document", Path.GetFileName(PendingMessages[guid].FilePath)); // Add the file
localClient.DefaultRequestHeaders.Add("token", PendingMessages[guid].Token);
var response =
await localClient.PostAsync("https://" + Properties.Settings.Default.ServerAddress + "/upload",
multiForm);
if (response.StatusCode == HttpStatusCode.OK)
{
string res = await response.Content.ReadAsStringAsync();
Console.WriteLine(res);
// parse result
var jsonRes = JsonConvert.DeserializeObject <JsonTypes.ServerStatus>(res);
if (!jsonRes.Ok)
{
throw new WebException("Server returned an error: " + response.StatusCode);
}
// submit the file
Websocket.Send(JsonConvert.SerializeObject(new JsonTypes.SendMessage
{
Id = guid,
Type = 1,
Payload = new JsonTypes.SendMessagePayload
{
To = username,
Message = JsonConvert.SerializeObject(new JsonTypes.FilePayload
{
FileName = Path.GetFileName(PendingMessages[guid].FilePath),
Token = PendingMessages[guid].Token,
FileSize = ByteSizeToString(new FileInfo(PendingMessages[guid].FilePath).Length)
})
}
}));
// update UI
PendingMessages[guid].Sent = 0;
PendingMessages[guid].Progress = 101;
// update database
await Database.RunInTransactionAsync(tran =>
{
tran.Insert(new DatabaseHelper.Messages
{
Date = DateTime.Now,
MyMessage = true,
Payload = PendingMessages[guid].Token,
Type = 1,
Username = PendingMessages[guid].With
});
tran.Insert(new DatabaseHelper.Files
{
Token = PendingMessages[guid].Token,
Location = PendingMessages[guid].FilePath,
Name = Path.GetFileName(PendingMessages[guid].FilePath)
});
});
}
else
{
throw new WebException("HTTP status code is not ok: " + response.StatusCode);
}
}
}
catch (Exception ex)
{
Console.WriteLine("Cannot upload file: " + ex);
PendingMessages[guid].Sent = 2; // show the user that the upload has been failed
PendingMessages[guid].Progress = 101; // show the user that the upload has been failed
}
finally
{
encryptedFile.Delete();
PendingMessages.Remove(guid);
}
}
private async void WS_OnMessage(object sender, MessageEventArgs e)
{
// at first try to parse the message as Server status.
try
{
var status = JsonConvert.DeserializeObject <JsonTypes.MessageStatus>(e.Data);
if (status.Id != null) // a real message status
{
if (!status.Ok)
{
Console.WriteLine("Error on message " + status.Id + ": " + status.Message);
}
if (status.Message != "sent") // this is a file token update
{
SharedStuff.PendingMessages[status.Id].Token = status.Message;
// now start upload
SharedStuff.UploadFile(status.Id);
}
else
{
SharedStuff.PendingMessages[status.Id].Sent = status.Ok ? (byte)0 : (byte)2;
// Do not remove files from here; They are removed at "finally" block of SharedStuff.UploadFile
if (SharedStuff.PendingMessages[status.Id].Type != 1)
{
SharedStuff.PendingMessages.Remove(status.Id);
}
}
return;
}
if (status.Message != null && !status.Ok)
{
// TODO: HANDLE THIS SHIT
return;
}
}
catch (Exception)
{
// ignored : the type might be something else
}
// try ClientUpdateTypeStruct
await _mu.WaitAsync(); // get the data in order that server sends them
string nameSafe = "";
try
{
var msg = JsonConvert.DeserializeObject <JsonTypes.Updates>(e.Data);
var keyList = await SharedStuff.Database.Table <DatabaseHelper.Users>().Where(k => k.Username == msg.Payload.From)
.ToArrayAsync(); // get the key of the user
string key;
if (keyList.Length == 0) // Key agreement
{
var data = await SharedStuff.GetUserData(msg.Payload.From);
key = Convert.ToBase64String(SharedStuff.Curve.calculateAgreement(
Convert.FromBase64String(_savedData.PrivateKey),
Convert.FromBase64String(data.PublicKey)));
await SharedStuff.Database.InsertAsync(new DatabaseHelper.Users // save the key in database
{
Username = data.Username,
Name = data.Name,
Key = key,
});
nameSafe = data.Name;
}
else // get the key from database; There is only one row because Username is unique
{
key = keyList[0].Key;
}
string toShowOnMainMenu = "";
JsonTypes.FilePayload filePayload = new JsonTypes.FilePayload();
switch (msg.Type)
{
case 0: // Text message
// decrypt the message or assign the file token
try
{
string message = BouncyCastleHelper.AesGcmDecrypt(msg.Payload.Message, key);
await SharedStuff.Database.InsertAsync(new DatabaseHelper.Messages
{
Username = msg.Payload.From,
Type = msg.Type,
Date = msg.Payload.Date,
Payload = message
});
toShowOnMainMenu = message;
}
catch (Exception)
{
// TODO: RE-REQUEST public key
}
break;
case 1: // File message
filePayload = JsonConvert.DeserializeObject <JsonTypes.FilePayload>(msg.Payload.Message);
await SharedStuff.Database.RunInTransactionAsync(trans =>
{
trans.Insert(new DatabaseHelper.Messages
{
Username = msg.Payload.From,
Type = msg.Type,
Date = msg.Payload.Date,
Payload = filePayload.Token
});
trans.Insert(new DatabaseHelper.Files
{
Token = filePayload.Token,
Name = filePayload.FileName
});
});
toShowOnMainMenu = filePayload.FileName;
break;
}
// save the value
bool inserted = false, open = OpenWindowsList.ContainsKey(msg.Payload.From);
int index = -1;
try
{
index = MessagesList.IndexOf(MessagesList.First(x =>
x.Username == msg.Payload.From)); // get index of the UI
if (index == -1)
{
throw new Exception();
}
}
catch (Exception)
{
string name = nameSafe;
if (name == "")
{
name = (await SharedStuff.GetUserData(msg.Payload.From)).Name;
}
Application.Current.Dispatcher.Invoke(delegate
{
MessagesList.Insert(0, new MainMessagesNotify
{
FullDate = msg.Payload.Date,
Message = toShowOnMainMenu,
IsLastMessageForUser = false,
Name = name,
NewMessages = 1,
Username = msg.Payload.From
});
});
inserted = true;
}
if (index == -1)
{
return;
}
if (!open) // increase unread messages
{
await SharedStuff.Database.ExecuteAsync("UPDATE Users SET UnreadMessages = ? WHERE Username = ?",
MessagesList[index].NewMessages + 1, msg.Payload.From);
}
if (!inserted)
{
Application.Current.Dispatcher.Invoke(delegate
{
// Show the user the update
MessagesList.Move(index, 0);
MessagesList[0].FullDate = msg.Payload.Date;
MessagesList[0].Message = toShowOnMainMenu;
MessagesList[0].IsLastMessageForUser = false;
if (!open)
{
MessagesList[0].NewMessages++;
}
});
}
// update the open windows
if (open)
{
if (msg.Type == 0) // add text messages
{
OpenWindowsList[msg.Payload.From].AddMessageText(toShowOnMainMenu, msg.Payload.Date);
}
else if (msg.Type == 1) // add files
{
OpenWindowsList[msg.Payload.From].AddMessageFile(filePayload.Token, filePayload.FileName, msg.Payload.Date);
}
}
}
catch (Exception ex)
{
// TODO: HANDLE THIS SHIT
}
finally
{
_mu.Release();
}
}
private async void LoginButtonClicked(object sender, RoutedEventArgs e)
{
LoadingDialogSample loadingDialog = new LoadingDialogSample // simple dialog with a spinning indicator
{
LoadingTextText = { Text = "Connecting to server..." } // set the text of the dialog
};
Exception error = null;
await DialogHost.Show(loadingDialog, "LoginDialogHost", delegate(object sender1, DialogOpenedEventArgs args) // show the dialog
{
string serverAddress = ServerUrlTxt.Text, username = UsernameTxt.Text, password = PasswordTxt.Password;
bool trustEveryThing = TrustSslCheckBox.IsChecked.HasValue && TrustSslCheckBox.IsChecked.Value;
Task.Factory.StartNew(async() => // connect to server from another thread
{
// let's see to trust all certificates or not
if (trustEveryThing)
{
ServicePointManager.ServerCertificateValidationCallback = (a, b, c, d) => true;
}
else
{
ServicePointManager.ServerCertificateValidationCallback = null;
}
// at first get server's public RSA key
try
{
if (SharedStuff.ServerPublicKey == null)
{
using (var wc = new WebClient())
{
string key = wc.DownloadString("https://" + serverAddress + "/publicKey");
SharedStuff.ServerPublicKey = BouncyCastleHelper.ReadAsymmetricKeyParameter(key);
}
}
}
catch (Exception ex)
{
error = new Exception("Can't get public key", ex);
// close dialog on main thread (because it is not running from main thread)
await Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() => args.Session.Close()));
return;
}
// now login the user
string toSave;
try
{
// at first generate a ecdh curve25519 key pair
var curveKeys = SharedStuff.Curve.generateKeyPair();
// encrypt the password with server's public key
string rsaPassword = Convert.ToBase64String(BouncyCastleHelper.RsaEncrypt(SharedStuff.ServerPublicKey, password));
// build the request
var postValues = new FormUrlEncodedContent(new[]
{
new KeyValuePair <string, string>("username", username),
new KeyValuePair <string, string>("password", rsaPassword),
new KeyValuePair <string, string>("key", Convert.ToBase64String(curveKeys.getPublicKey())),
});
var result = await SharedStuff.Client.PostAsync("https://" + serverAddress + "/users/registerClient", postValues);
string resultContent = await result.Content.ReadAsStringAsync();
// parse the server result
var jsonRes = JsonConvert.DeserializeObject <JsonTypes.ServerStatus>(resultContent);
if (!jsonRes.Ok)
{
throw new Exception("Server returned an error: " + jsonRes.Message);
}
// save the login details
toSave = JsonConvert.SerializeObject(new JsonTypes.SavedData
{
Username = username,
Password = password,
PublicKey = Convert.ToBase64String(curveKeys.getPublicKey()),
PrivateKey = Convert.ToBase64String(curveKeys.getPrivateKey())
});
Properties.Settings.Default.Name = jsonRes.Message;
Properties.Settings.Default.ServerAddress = serverAddress;
}
catch (Exception ex)
{
error = new Exception("Can't login you", ex);
// close dialog on main thread (because it is not running from main thread)
await Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() => args.Session.Close()));
return;
}
// save the data (we had a successful login)
try
{
byte[] encrypted = ProtectedData.Protect(Encoding.UTF8.GetBytes(toSave), null, DataProtectionScope.CurrentUser); // encrypt the data
Properties.Settings.Default.LoginData = Convert.ToBase64String(encrypted); // save data to application settings
Properties.Settings.Default.TrustInvalidSSL = trustEveryThing;
Properties.Settings.Default.Save();
}
catch (Exception ex)
{
error = new Exception("Cannot save data", ex);
// TODO: logout the user if this fails
// close dialog on main thread (because it is not running from main thread)
await Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() => args.Session.Close()));
return;
}
// close dialog on main thread (because it is not running from main thread)
await Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() => args.Session.Close()));
});
});
// check for errors
if (error != null)
{
ErrorDialogSample errorDialog = new ErrorDialogSample
{
ErrorTitle = { Text = error.Message },
ErrorText = { Text = error.InnerException.Message } // Inner exception is never empty
};
await DialogHost.Show(errorDialog, "LoginDialogHost");
}
else // login the user
{
Hide();
new MainChatsWindow().Show();
}
}
