Initial import.

src/zall/util/facebook/FacebookConnect.java

@@ -0,0 +1,206 @@
+package zall.util.facebook;
+
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.logging.Logger;
+
+import javax.servlet.http.Cookie;
+import javax.servlet.http.HttpServletResponse;
+
+import zutil.Hasher;
+import zutil.log.LogUtil;
+import zutil.parser.Base64Decoder;
+import zutil.parser.DataNode;
+import zutil.parser.json.JSONParser;
+
+/**
+ * This class connects to Facebook and 
+ * retrieves information about the user
+ * 
+ * @author Ziver
+ */
+public class FacebookConnect {
+	private static Logger logger = LogUtil.getLogger();
+
+	/** The URL to the Facebook OpenGraph service. (must end with a '/') **/
+	public static final String SERVICE_URL = "https://graph.facebook.com/";
+
+	/** The application id for this application generated by Facebook **/
+	protected static String application_id = null;
+	/** The application secret for this application generated by Facebook **/
+	protected static String application_secret = null;
+
+
+	protected String access_token;
+	protected FBUser user;
+
+	private FacebookConnect( String access_token, String uid ){
+		this.access_token = access_token;
+		user = FBUser.get( this, uid );
+	}
+
+	/**
+	 * @return 		the main user
+	 */
+	public FBUser getUser(){
+		return user;
+	}
+
+	/**
+	 * Returns the given user by UID
+	 * 
+	 * @param 	uid		is the user id of the user
+	 * @return			a FBUser object or null if there is no such user
+	 */
+	public FBUser getUser(String uid){
+		return FBUser.get( this, uid );
+	}
+
+	/**
+	 * @return			The access token for this session
+	 */
+	protected String getAccessToken(){
+		return access_token;
+	}
+
+	/**
+	 * Generates a url for calling the Facebook OpenGraph API
+	 * 
+	 * @param 		page		is the page ex. a UID
+	 * @return					A URL to the service
+	 * @throws MalformedURLException 
+	 */
+	protected URL getServiceURL(String page) throws MalformedURLException{
+		return getServiceURL(page, null);
+	}
+
+	/**
+	 * Generates a url for calling the Facebook OpenGraph API
+	 * 
+	 * @param 		page		is the page ex. a UID
+	 * @param 		params		is URL parameters ex. "?name=lol" or "&name=lol&lol=name" or "name=lol" etc...
+	 * @return					A URL to the service
+	 * @throws MalformedURLException 
+	 */
+	protected URL getServiceURL(String page, String params) throws MalformedURLException{
+		StringBuilder url = new StringBuilder( SERVICE_URL );
+		url.append( page );
+		url.append( '?' );
+		url.append( "access_token=" );
+		url.append( access_token );
+
+		if( params != null && !params.isEmpty() ){
+			if( params.charAt(0) == '?' )
+				params = params.substring( 1 );
+			if( params.charAt(0) != '&' )
+				url.append( '&' );
+
+			url.append( params );
+		}
+		return new URL( url.toString() );
+	}
+
+	/**
+	 * Sets the static values for this application
+	 * @param 	id			is the application id for this application generated by Facebook
+	 * @param 	secret		is the application secret for this application generated by Facebook
+	 */
+	public static void setApplicationID(String id, String secret){
+		application_id = id;
+		application_secret = secret;
+	}
+
+	public static String getAplicationId() {
+		return application_id;
+	}
+
+	/**
+	 * Creates a new instance of the FacebookConnect for the logged in user
+	 * or null if the creation was unsuccessful.
+	 * 
+	 * @param 	cookies		is the cookies from the client
+	 * @return				A new FacebookConnect object or null if the creation was unsuccessful
+	 */
+	public static FacebookConnect getConnection( Cookie[] cookies ){
+		if( cookies == null ){
+			logger.severe("Cookie is not set!");
+			return null;
+		}
+		
+		String cookie_name = "fbsr_" + application_id;
+		// Find the cookie
+		for(Cookie cookie : cookies) {
+			if ( cookie_name.equals(cookie.getName()) ){
+				// remove the trailing "
+				String value = cookie.getValue();
+				return getConnection( value );
+			}
+		}
+		System.out.println("Facebook Nothing here!");
+		return null;
+	}
+
+	/**
+	 * Creates a new instance of the FacebookConnect for the logged in user
+	 * or null if the creation was unsuccessful.
+	 * 
+	 * @param 	value		is the string value from facebook
+	 * @return				A new FacebookConnect object or null if the creation was unsuccessful
+	 */
+	public static FacebookConnect getConnection( String value ){
+		if( application_id == null ){
+			logger.severe("Application_id is not set!");
+			return null;
+		}
+		if( application_secret == null ){
+			logger.severe("Application_secret is not set!");
+			return null;
+		}
+		
+		value = value.trim();
+		if( value.isEmpty() )
+			return null;
+		value = value.replaceAll("-", "+");
+		value = value.replaceAll("_", "/");
+		
+		// Parse the attributes
+		String[] attrib = value.split("\\.", 2);
+		String signature = Base64Decoder.decodeToHex( attrib[0] );
+		System.out.println( signature );
+		attrib[1] = Base64Decoder.addPadding( attrib[1] );
+		String data = Base64Decoder.decode( attrib[1] );
+		JSONParser json = new JSONParser();
+		DataNode map = json.read( data );	
+		System.out.println(map);
+
+		if ( !map.getString("algorithm").equalsIgnoreCase("HMAC-SHA256") ) {
+			logger.severe("Unknown algorithm: '"+map.getString("algorithm")+"' Expected 'HMAC-SHA256'");
+			return null;
+		}
+		// Check hash signature
+		String local_sig = Hasher.HMAC_SHA256( attrib[1], application_secret );
+		System.out.println(local_sig);
+		if ( !signature.equals( local_sig )) {
+			logger.severe("Bad Signed JSON signature: '"+signature+"' Expected '"+local_sig+"'");
+			return null;
+		}
+		
+		//if( map.containsKey( "access_token" ) )
+		//	return new FacebookConnect( map.get( "access_token" ), map.get( "uid" ) );
+		//return null;
+		return null;
+	}
+	
+	/**
+	 * This method remove the cookie from the user by setting the MaxAge to -1
+	 * 
+	 * @param 		response		is the response that the cookie will be added to
+	 */
+	public void logout(HttpServletResponse response) {
+		Cookie cookie = new Cookie( "fbsr_" + application_id, null);
+		cookie.setMaxAge( 0 );
+		cookie.setPath("/");
+		response.addCookie( cookie );		
+	}
+
+}