X-FACEBOOK-PLATFORM authentication with SMACK Java library using OAuth 2.0 - xmpp

Question

First post here so please be gentle.
I'm building a facebook chat client, using Smack library.
I'm using X-FACEBOOK-PLATFORM method in order not to save any passwords. I had it working properly using oauth 1.0, and want to change it to 2.0, cause of the october 1st deadline ;p. From what I understand the only thing I'd have to do in order to migrate to 2.0 is removing "sig" and "session_key" parameters and adding an "access_token" parameter, but I'm getting an "SASL authentication X-FACEBOOK-PLATFORM failed: not-authorized:".
I'm using this custom SASLMechanism class:
package smackresearching;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.GregorianCalendar;
import java.util.HashMap;
import java.util.Map;
import javax.security.sasl.Sasl;
import org.jivesoftware.smack.SASLAuthentication;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.sasl.SASLMechanism;
import org.jivesoftware.smack.util.Base64;
public class SASLXFacebookPlatformMechanism extends SASLMechanism {
public static final String NAME = "X-FACEBOOK-PLATFORM";
private String apiKey = "";
private String accessToken = "";
/**
* Constructor.
*/
public SASLXFacebookPlatformMechanism(SASLAuthentication saslAuthentication) {
super(saslAuthentication);
}
#Override
protected void authenticate() throws IOException, XMPPException {
// Send the authentication to the server
getSASLAuthentication().send(new AuthMechanism(getName(), ""));
}
#Override
public void authenticate(String apiKey, String host, String accessToken) throws IOException, XMPPException {
this.apiKey = apiKey;
this.accessToken = accessToken;
this.hostname = host;
String[] mechanisms = { "DIGEST-MD5" };
Map<String, String> props = new HashMap<String, String>();
this.sc = Sasl.createSaslClient(mechanisms, null, "xmpp", host, props, this);
authenticate();
}
#Override
protected String getName() {
return NAME;
}
#Override
public void challengeReceived(String challenge) throws IOException {
byte[] response = null;
if (challenge != null) {
String decodedChallenge = new String(Base64.decode(challenge));
Map<String, String> parameters = getQueryMap(decodedChallenge);
String version = "1.0";
String nonce = parameters.get("nonce");
String method = parameters.get("method");
long callId = new GregorianCalendar().getTimeInMillis() / 1000L;
String composedResponse = "api_key=" + URLEncoder.encode(apiKey, "utf-8")
+ "&call_id=" + callId
+ "&method=" + URLEncoder.encode(method, "utf-8")
+ "&nonce=" + URLEncoder.encode(nonce, "utf-8")
+ "&access_token=" + URLEncoder.encode(accessToken, "utf-8")
+ "&v=" + URLEncoder.encode(version, "utf-8");
response = composedResponse.getBytes("utf-8");
}
String authenticationText = "";
if (response != null){
authenticationText = Base64.encodeBytes(response, Base64.DONT_BREAK_LINES);
}
// Send the authentication to the server
getSASLAuthentication().send(new Response(authenticationText));
}
private Map<String, String> getQueryMap(String query) {
Map<String, String> map = new HashMap<String, String>();
String[] params = query.split("\\&");
for (String param : params) {
String[] fields = param.split("=", 2);
map.put(fields[0], (fields.length > 1 ? fields[1] : null));
}
return map;
}
}
And this is the Main code:
ConnectionConfiguration config = new ConnectionConfiguration("chat.facebook.com", 5222);
config.setSASLAuthenticationEnabled(true);
// config.setDebuggerEnabled(true);
XMPPConnection connection = new XMPPConnection(config);
try {
//ESTA LINEA HACE QUE NO DE TIMEOUT
SmackConfiguration.setPacketReplyTimeout(15000);
XMPPConnection.DEBUG_ENABLED = true;
SASLAuthentication.registerSASLMechanism("X-FACEBOOK-PLATFORM", SASLXFacebookPlatformMechanism.class);
SASLAuthentication.supportSASLMechanism("X-FACEBOOK-PLATFORM", 0);
connection.connect();
String apiKey = "3290282390339";
String accessToken = "ADSJGFGFKDKSJKSJD0-43DKJSDJKSDKJSD094JJSDKJSDKJDSNDSKJEWEWNSDLkljdkjs";
connection.login(apiKey, accessToken);
...
Thanks in advance for any advice.

Answer 1

There is a missing ampersand for the access_token parameter in the composedResponse string. Is this a typo?
Could you post the authenticationText you are sending?