public async Task Connect()
{
await _physicalConnection.Connect(_clientOptions).ConfigureAwait(false);
var greetingsResponseBytes = new byte[128];
var readCount = await _physicalConnection.ReadAsync(greetingsResponseBytes, 0, greetingsResponseBytes.Length).ConfigureAwait(false);
if (readCount != greetingsResponseBytes.Length)
{
throw ExceptionHelper.UnexpectedGreetingBytesCount(readCount);
}
var greetings = new GreetingsResponse(greetingsResponseBytes);
_clientOptions.LogWriter?.WriteLine($"Greetings received, salt is {Convert.ToBase64String(greetings.Salt)} .");
PingsFailedByTimeoutCount = 0;
_responseReader.BeginReading();
_requestWriter.BeginWriting();
_clientOptions.LogWriter?.WriteLine("Server responses reading started.");
await LoginIfNotGuest(greetings).ConfigureAwait(false);
}
public static AuthenticationRequest Create(GreetingsResponse greetings, UriBuilder uri)
{
var scrable = GetScrable(greetings, uri.Password);
var authenticationPacket = new AuthenticationRequest(uri.UserName, scrable);
return(authenticationPacket);
}
private static byte[] GetScrable(GreetingsResponse greetings, string password)
{
var decodedSalt = greetings.Salt;
var first20SaltBytes = new byte[20];
Array.Copy(decodedSalt, first20SaltBytes, 20);
var step1 = Sha1Utils.Hash(password);
var step2 = Sha1Utils.Hash(step1);
var step3 = Sha1Utils.Hash(first20SaltBytes, step2);
var scrambleBytes = Sha1Utils.Xor(step1, step3);
return(scrambleBytes);
}
private async Task LoginIfNotGuest(GreetingsResponse greetings)
{
var singleNode = _clientOptions.ConnectionOptions.Nodes.Single();
if (string.IsNullOrEmpty(singleNode.Uri.UserName))
{
_clientOptions.LogWriter?.WriteLine("Guest mode, no authentication attempt.");
return;
}
var authenticateRequest = AuthenticationRequest.Create(greetings, singleNode.Uri);
await SendRequestWithEmptyResponse(authenticateRequest).ConfigureAwait(false);
_clientOptions.LogWriter?.WriteLine($"Authentication request send: {authenticateRequest}");
}
private async Task LoginIfNotGuest(GreetingsResponse greetings)
{
if (!_clientOptions.ConnectionOptions.Nodes.Any())
{
throw new ClientSetupException("There are zero configured nodes, you should provide one");
}
var singleNode = _clientOptions.ConnectionOptions.Nodes.Single();
if (string.IsNullOrEmpty(singleNode.Uri.UserName))
{
_clientOptions.LogWriter?.WriteLine("Guest mode, no authentication attempt.");
return;
}
var authenticateRequest = AuthenticationRequest.Create(greetings, singleNode.Uri);
await SendRequestWithEmptyResponse(authenticateRequest).ConfigureAwait(false);
_clientOptions.LogWriter?.WriteLine($"Authentication request send: {authenticateRequest}");
}
