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function login(){

	errorMessage = null;

	if(!userName){
		errorMessage = 'Please specify a user name';
		return false;
	}
	if(!password){
		errorMessage = 'Please specify a password';
		return false;
	}

	var tenantID = security.authenticate("myAuthenticator","getTenant",[userName]);
	if(tenantID){
		if(security.authenticate("myAuthenticator","loginUser",[userName,password])){
			return true;
		} else {
			errorMessage = "No tenant found. Please check your password";
		}
	}
	errorMessage = 'Login Failed';
}

function loginUser(user, password) {
	if (!(user && password)) {
		application.output('Unexpected credentials received', LOGGINGLEVEL.DEBUG);
		return false;
	}
	var authenticated = ... //either query database or use LDAP

	if (authenticated) {
		var ok = security.login(user, user, ['group']) // Assume a group for each department
		application.output('User ' + user + ' authenticated: ' + ok, LOGGINGLEVEL.DEBUG);
		return ok;
	}
	application.output('User ' + user + ' could not be authenticated', LOGGINGLEVEL.DEBUG);
	// Sleep for 3 seconds to discourage brute force attacks
	application.sleep(3000);
	return false;
}