/**includes目录下：lib_chat.php
 *
 *修改函数函数（判断用户是否存在）：function check_of_username_
 *
 * 判断用户是否存在
 *
 * @param string $username
 * @return boolean
 */
function check_of_username_exist($username)
{
	$_CFG = $GLOBALS['_CFG'];
	$of_username = $_CFG['chat_server_admin_username'];
	$of_password = $_CFG['chat_server_admin_password'];
	$of_ip = $_CFG['chat_server_ip'];
	$of_port = $_CFG['chat_server_port'];
	
	$of_url = get_of_url($of_ip, $of_port);
	if(empty($username))
	{
		return false;
	}

	$url = $of_url.'/plugins/userService/users/'.$username;

	$ch = curl_init();
	curl_setopt($ch, CURLOPT_URL, $url);
	// 授权验证
	curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
	curl_setopt($ch, CURLOPT_USERPWD, $of_username.":".$of_password);

	// 设置可以读取返回值
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

	// 运行curl
	$result = trim(curl_exec ( $ch ));
	// 关闭
	curl_close ( $ch );
	
	//读XML文件内容，并保存到字符串变量中	
	$xml = new SimpleXMLElement($result);
	//获得username的值  
	$test = new SimpleXMLElement($result);
	$refusername = $test->username;  
	if(!empty($username))
	{
		if($refusername == $username)
		{
			return true;
		}
		else
		{
			return false;
		}
	}
	else
	{
		return false;
	}	

}
/**
 *3：修改函数名：获取聊天服务器的域名：function get_xmpp_domain()
 *
 * 获取聊天服务器的域名
 *
 * @param unknown $username
 * @param string $type 返回的数据类型：xml,text,image,默认为text
 * @return string
 */
function get_xmpp_domain()
{
	$_CFG = $GLOBALS['_CFG'];
	$of_username = $_CFG['chat_server_admin_username'];
	$of_password = $_CFG['chat_server_admin_password'];
	$of_ip = $_CFG['chat_server_ip'];
	$of_port = $_CFG['chat_server_port'];
	
	$of_url = get_of_url($of_ip, $of_port);

	$url = $of_url.'/plugins/userService/users/domain';

	$ch = curl_init();
	curl_setopt($ch, CURLOPT_URL, $url);
	// 授权验证
	curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
	curl_setopt($ch, CURLOPT_USERPWD, $of_username.":".$of_password);
	// 设置可以读取返回值
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

	// 运行curl
	$result = trim(curl_exec ( $ch ));
 	
	// 关闭
	curl_close ( $ch );
	//获得email的值  
	$test = new SimpleXMLElement($result);
	$email = $test->email;  
	$result = $email;	
	return $result;
}