public String authenticate(String username, byte[] password) { // throws
// RemoteException
// {
UserInterface user = DbObjectServiceModel.GetServerSideInstance().FindUser(username);
if (user == null) {
return null;
} else {
try {
if (user.Fetch()) {
byte[] hashedPassword = user.GetPassword();
MessageDigest.getInstance("SHA-512");
if (MessageDigest.isEqual(password, hashedPassword)) {
// authentication successful.
// generate a unique string to return it to the client.
return java.util.UUID.randomUUID().toString();
} else {
// authentication failure.
return null;
}
}
} catch (AlreadyDeletedException e) {
// the user had already been killed.
e.printStackTrace();
return null;
} catch (NoSuchAlgorithmException e) {
// Should never reach this block, but throw it here anyway.
e.printStackTrace();
return null;
}
}
return "";
}
public boolean registerMe(
String token, UserInterface user, ClientReceptionInterface cri) { // throws RemoteException {
if (alive_users.containsKey(token) && alive_users.get(token).equals(user)) {
keepMeAlive(token);
return true;
} else {
alive_users.put(token, user);
alive_clients.put(token, new Date());
alive_clients_to_push.put(token, cri);
return EngineImpl.GetInstance().register(token, user.GetLastActive());
}
}
public boolean unregisterMe(String token, UserInterface user) { // throws
// RemoteException
// {
if (alive_users.containsKey(token) && alive_users.get(token).equals(user)) {
if (EngineImpl.GetInstance().unregister(token)) {
alive_users.remove(token);
alive_clients.remove(token);
alive_clients_to_push.remove(token);
return user.SetLastActive(new Date());
} else {
return false;
}
}
return false;
}