String appdata = parameters.getString("appdata");
String ts = parameters.getString("ts");
String requestsig = parameters.getString("sig");
String token = parameters.getString("token");
YahooResponse authenticateUser =
YahooBBAuth.authenticateUser(appId, secret, uri, appdata, ts, requestsig, token);
// TODO identify user and log in
((WaspSession) Session.get()).login(new ApplicationLoginContext("foo", "bar"));
((MySession) Session.get()).setUsername("foo");
if (!continueToOriginalDestination())