<?php 
// (c) Copyright 2002-2013 by authors of the Tiki Wiki CMS Groupware Project
// 
// All Rights Reserved. See copyright.txt for details and a complete list of authors.
// Licensed under the GNU LESSER GENERAL PUBLIC LICENSE. See license.txt for details.
// $Id: validator_username.php 44443 2013-01-05 20:30:09Z changi67 $

function validator_username($input, $parameter = '', $message = '')
{
	global $userlib, $prefs;
	if ($userlib->user_exists($input)) {
		return tra("User already exists");
	}
	if (!empty($prefs['username_pattern']) && !preg_match($prefs['username_pattern'], $input)) {
		return tra("Invalid character combination for username");
	}
	if (strtolower($input) == 'anonymous' || strtolower($input) == 'registered') {
		return tra("Invalid username");
	}
	if (strlen($input) > $prefs['max_username_length']) {
		$error = tr("Username cannot contain more than %0 characters", $prefs['max_username_length']);
		return $error;
	}
	if (strlen($input) < $prefs['min_username_length']) {
		$error = tr("Username must be at least %0 characters long", $prefs['min_username_length']);
		return $error;
	}
	return true;
}
