/// <inheritdoc/>
public async Task <XmppXElement> AuthenticateClientAsync(XmppClient xmppClient, CancellationToken cancellationToken)
{
var scramHelper = new ScramHelper();
var username = xmppClient.Username;
#if STRINGPREP
var password = StringPrep.SaslPrep(xmppClient.Password);
#else
var password = xmppClient.Password;
#endif
string msg = ToB64String(scramHelper.GenerateFirstClientMessage(username));
var authMessage = new Auth(SaslMechanism.ScramSha1, msg);
var ret1 = await xmppClient.SendAsync <Failure, Challenge>(authMessage, cancellationToken);
if (ret1 is Challenge)
{
var resp = GenerateFinalMessage(ret1 as Challenge, scramHelper, password);
var ret2 = await xmppClient.SendAsync <Failure, Success>(resp, cancellationToken);
return(ret2);
}
return(ret1);
}
private Response GenerateFinalMessage(Challenge ch, ScramHelper scramHelper, string password)
{
byte[] b = ch.Bytes;
string firstServerMessage = Encoding.UTF8.GetString(b, 0, b.Length);
string clientFinalMessage = scramHelper.GenerateFinalClientMessage(firstServerMessage, password);
return(new Response(ToB64String(clientFinalMessage)));
}
