Facebook chat XMPP authentication with Gloox? - c++

Question

Well, I'm probably doing something silly, but I've been beating my head against the wall with this for the past few hours, and so far I have no idea what I've been doing wrong.
At the moment I'm trying to make this work with PLAIN SASL because it seems like Facebook actively makes OAuth2 a pain for non-Web apps, but it really makes no difference to me as long as I can get this to work somehow.
Current code:
_client = new Client(JID(username /* no #chat.facebook.com */), password);
_client->setServer("chat.facebook.com");
_client->setPort(5222);
_client->setSASLMechanisms(gloox::SaslMechPlain);
_client->setTls(gloox::TLSPolicy::TLSRequired);
_client->connect(false);
_client->login(); // not necessary?
QThread::sleep(10); // arbitrary sleep; should be sufficient
std::cout << _client->authed() << std::endl; // false
std::cout << _client->authError() << std::endl; // AuthErrorUndefined
_client->rosterManager()->fill();
// neither one has any effect
MessageSession(_client, JID("friend#chat.facebook.com")).send("balls");
MessageSession(_client, JID("friend")).send("balls");
std::cout << _client->rosterManager()->roster()->size() << std::endl; // 0
Edit: For that matter, I can't get Gloox working with Gmail either (haven't tried any other XMPP servers).

Answer 1

Your JID is indeed username#chat.facebook.com, not only username - and it is very important to SASL authentication, it will not work with wrong JID.
Facebook chat supports SASL PLAIN authentication over SSL/TLS connection, as well as DIGEST-MD5
Google talk supports SASL PLAIN over TLS too
You can see supported SASL mechanisms in the first <stream:features>...</stream:features> packet from the server
It will be much better if your show error logs

Answer 2

Well, I'm still not 100% sure what the problem with Gloox was, but the following roughly equivalent Swiften code works with no issues.
SimpleEventLoop* eventLoop = new SimpleEventLoop();
BoostNetworkFactories networkFactories(eventLoop);
_client = new Client
(
username.append("#chat.facebook.com").toStdString(),
password.toStdString(),
&networkFactories
);
_client->setAlwaysTrustCertificates();
_client->onConnected.connect([&] () { signInStatus = SignInStatus::Success; });
_client->onDisconnected.connect([&] (const boost::optional<ClientError>& e) {
signInStatus = SignInStatus::InvalidCredentials;
});
_client->connect();
std::thread([&] () { eventLoop->run(); }).detach();
while (signInStatus == SignInStatus::NotSignedIn)
{
QThread::sleep(1);
}
if (signInStatus == SignInStatus::InvalidCredentials)
{
return signInStatus;
}
_client->requestRoster();
QThread::sleep(5);
std::cout << _client->getRoster()->getItems()[0].getName() << std::endl;
Message::ref message(new Message());
message->setTo(_client->getRoster()->getItems()[0].getJID());
message->setFrom(JID());
message->setBody("balls");
_client->sendMessage(message);