Android Open Source - Fabby-Chat S A S L Facebook Mechanism

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License

The source code is released under:

MIT License

Java Source Code

package com.fabbychat.sasl;
//from w  w w  .  jav a 2  s  .  c o  m
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.GregorianCalendar;
import java.util.HashMap;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;

import org.apache.harmony.javax.security.auth.callback.CallbackHandler;
import org.apache.harmony.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;


// ported from
// http://code.google.com/p/fbgc/source/browse/trunk/daemon/src/main/java/org/albino/mechanisms/FacebookConnectSASLMechanism.java

public class SASLFacebookMechanism extends SASLMechanism {
  
  // TODO: line lengths
  // TODO: string format
  
  public static String NAME = "X-FACEBOOK-PLATFORM";

  private String sessionKey = "";
    private String sessionSecret = "";
    private String apiKey = "";
 
  public SASLFacebookMechanism(SASLAuthentication arg0) {
    super(arg0);
  }

    protected void authenticate() throws IOException, XMPPException {
      AuthMechanism packet = new AuthMechanism(NAME, null);
        // Send the authentication to the server
        getSASLAuthentication().send(packet);
    }

    public void 
    authenticate(String apiKeyAndSessionKey, String host, String sessionSecret)
        throws IOException, XMPPException {
        if (apiKeyAndSessionKey == null || sessionSecret == null) {
            throw new IllegalStateException("Invalid parameters!");
        }
        
        String[] keyArray = apiKeyAndSessionKey.split("\\|");
        
        if (keyArray == null || keyArray.length != 2) {
            throw new IllegalStateException("Api key or session key is not present!");
        }
        
        this.apiKey = keyArray[0];
        this.sessionKey = keyArray[1];
        this.sessionSecret = sessionSecret;
        
        this.authenticationId = sessionKey;
        this.password = sessionSecret;
        this.hostname = host;

        String[] mechanisms = { "DIGEST-MD5" };
        Map<String, String> props = new HashMap<String, String>();
        sc = Sasl.createSaslClient(mechanisms, null, "xmpp", host, props, this);
        authenticate();
    }

    public void authenticate(String username, String host, CallbackHandler cbh)
        throws IOException, XMPPException {
        String[] mechanisms = { "DIGEST-MD5" };
        Map<String, String> props = new HashMap<String, String>();
        sc = Sasl.createSaslClient(mechanisms, null, "xmpp", host, props, cbh);
        authenticate();
    }

    protected String getName() {
        return NAME;
    }

    public void challengeReceived(String challenge) throws IOException {
        byte response[] = null;
        if (challenge != null) {
            String decodedResponse = new String(Base64.decode(challenge));
            Map<String, String> parameters = getQueryMap(decodedResponse);
            Long callId = new GregorianCalendar().getTimeInMillis() / 1000;
            
            SortedMap<String, String> params = new TreeMap<String, String>();
            params.put("api_key", apiKey);
            params.put("call_id", callId.toString());
            params.put("method", parameters.get("method"));
            params.put("nonce", parameters.get("nonce"));
            params.put("session_key", sessionKey);
            params.put("v", "1.0");
            
            StringBuilder sigB = new StringBuilder();
            for (Map.Entry<String, String> entry : params.entrySet()) {
                sigB.append(String.format("%s=%s", 
                  entry.getKey(), entry.getValue()));
            }
            sigB.append(sessionSecret);
            
            String sig;
            try {
              sig = MD5(sigB.toString());
            } catch (NoSuchAlgorithmException e) {
                throw new IllegalStateException(e);
            }
            
            StringBuilder composedResp = new StringBuilder();
            for (Map.Entry<String, String> entry : params.entrySet()) {
                composedResp.append(String.format("%s=%s&", 
                  entry.getKey(), entry.getValue()));
            }
            composedResp.append("sig=" + sig);
            
            response = composedResp.toString().getBytes();
        }
        String authenticationText = response == null? "" : 
          Base64.encodeBytes(response, Base64.DONT_BREAK_LINES);
        getSASLAuthentication().send(new Response(authenticationText));
    }

    private Map<String, String> getQueryMap(String query) {
            String[] params = query.split("&");
            Map<String, String> map = new HashMap<String, String>();
            for (String param : params) {
                String name = param.split("=")[0];
                String value = param.split("=")[1];
                map.put(name, value);
            }
            return map;
    }
    
  private String convertToHex(byte[] data) {
      StringBuffer buf = new StringBuffer();
      for (int i = 0; i < data.length; i++) {
          int halfbyte = (data[i] >>> 4) & 0x0F;
          int two_halfs = 0;
          do {
              if ((0 <= halfbyte) && (halfbyte <= 9))
                  buf.append((char) ('0' + halfbyte));
              else
                  buf.append((char) ('a' + (halfbyte - 10)));
              halfbyte = data[i] & 0x0F;
          } while(two_halfs++ < 1);
      }
      return buf.toString();
  }

  private String MD5(String text) 
      throws NoSuchAlgorithmException, UnsupportedEncodingException  {
      MessageDigest md;
      md = MessageDigest.getInstance("MD5");
      byte[] md5hash = new byte[32];
      md.update(text.getBytes("iso-8859-1"), 0, text.length());
      md5hash = md.digest();
      return convertToHex(md5hash);
  }
}

Java Source Code List

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