最后，由于使用了no.good.at.coding编码和骚扰的建议，我已经能够连接到Facebook聊天了。这段代码是Asmack库的机制（Android的Smack端口）。对于Smack库，必须使用no.good.at.coding机制。
SASLXFacebookPlatformMechanism.java：
import java.io.IOException;import java.io.UnsupportedEncodingException; import java.net.URLEnprer; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.util.GregorianCalendar; import java.util.HashMap; import java.util.Map; 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;public class SASLXFacebookPlatformMechanism extends SASLMechanism { private static final String NAME = "X-FACEBOOK-PLATFORM"; private String apiKey = ""; private String applicationSecret = ""; private String sessionKey = ""; public SASLXFacebookPlatformMechanism(SASLAuthentication saslAuthentication) { super(saslAuthentication); } @Override protected void authenticate() throws IOException, XMPPException { getSASLAuthentication().send(new AuthMechanism(NAME, "")); } @Override public void authenticate(String apiKeyAndSessionKey, String host, String applicationSecret) throws IOException, XMPPException { if (apiKeyAndSessionKey == null || applicationSecret == null) { throw new IllegalArgumentException("Invalid parameters"); } String[] keyArray = apiKeyAndSessionKey.split("\|", 2); if (keyArray.length < 2) { throw new IllegalArgumentException( "API key or session key is not present"); }this.apiKey = keyArray[0]; this.applicationSecret = applicationSecret; this.sessionKey = keyArray[1];this.authenticationId = sessionKey; this.password = applicationSecret; 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 public void authenticate(String username, String host, CallbackHandler cbh)throws IOException, XMPPException { String[] mechanisms = { "DIGEST-MD5" }; Map<String, String> props = new HashMap<String, String>(); this.sc = Sasl.createSaslClient(mechanisms, null, "xmpp", host, props,cbh); authenticate(); } @Override protected String getName() { return NAME; } @Override public void challengeReceived(String challenge) throws IOException { byte[] response = null;if (challenge != null) { String depredChallenge = new String(base64.depre(challenge)); Map<String, String> parameters = getQueryMap(depredChallenge); String version = "1.0"; String nonce = parameters.get("nonce"); String method = parameters.get("method"); long callId = new GregorianCalendar().getTimeInMillis(); String sig = "api_key=" + apiKey + "call_id=" + callId + "method=" + method + "nonce=" + nonce + "session_key=" + sessionKey + "v=" + version + applicationSecret; try { sig = md5(sig); } catch (NoSuchAlgorithmException e) { throw new IllegalStateException(e); } String composedResponse = "api_key=" + URLEnprer.enpre(apiKey, "utf-8") + "&call_id=" + callId + "&method="+ URLEnprer.enpre(method, "utf-8") + "&nonce="+ URLEnprer.enpre(nonce, "utf-8")+ "&session_key="+ URLEnprer.enpre(sessionKey, "utf-8") + "&v="+ URLEnprer.enpre(version, "utf-8") + "&sig="+ URLEnprer.enpre(sig, "utf-8");response = composedResponse.getBytes("utf-8"); } String authenticationText = ""; if (response != null) {authenticationText = base64.enpreBytes(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; } private String md5(String text) throws NoSuchAlgorithmException,UnsupportedEncodingException { MessageDigest md = MessageDigest.getInstance("MD5"); md.update(text.getBytes("utf-8"), 0, text.length()); return convertToHex(md.digest()); } private String convertToHex(byte[] data) { StringBuilder buf = new StringBuilder(); int len = data.length;for (int i = 0; i < len; i++) { int halfByte = (data[i] >>> 4) & 0xF; int twoHalfs = 0; do { if (0 <= halfByte && halfByte <= 9) { buf.append((char) ('0' + halfByte)); } else { buf.append((char) ('a' + halfByte - 10)); } halfByte = data[i] & 0xF; } while (twoHalfs++ < 1); }return buf.toString(); } }要使用它：
ConnectionConfiguration config = new ConnectionConfiguration("chat.facebook.com", 5222); config.setSASLAuthenticationEnabled(true); XMPPConnection xmpp = new XMPPConnection(config); try { SASLAuthentication.registerSASLMechanism("X-FACEBOOK-PLATFORM", SASLXFacebookPlatformMechanism.class); SASLAuthentication.supportSASLMechanism("X-FACEBOOK-PLATFORM", 0); xmpp.connect(); xmpp.login(apiKey + "|" + sessionKey, sessionSecret, "Application"); } catch (XMPPException e) { xmpp.disconnect(); e.printStackTrace(); }apiKey是在Facebook的“应用程序设置”页面中提供的API密钥。sessionKey是访问令牌的第二部分。如果令牌的格式为AAA | BBB |
CCC，则BBB是会话密钥。sessionSecret是使用旧的REST
API和auth.promoteSession方法获得的。要使用它，需要使Http到达该URL：
https://api.facebook.com/method/auth.promoteSession?access_token=yourAccessToken
尽管有Facebook
Chat文档，但仍需要使用您的应用程序秘密密钥，只有当我使用返回了该REST方法的密钥时，我才能够使它起作用。为了使该方法有效，您必须在应用程序设置的“高级”选项卡中禁用“禁用不赞成使用的身份验证方法”选项。
