<?php
/**
 * @author sol (sol@nhn.com)
 * @brief css 및 js Optimizer 처리 gateway
 *
 **/


if(!$_GET['t'] || !$_GET['l']) exit;

// set env
$XE_PATH = substr(dirname(__FILE__),0,strlen('common')*-1);
define('__XE_PATH__', $XE_PATH);
define('__ZBXE__', true);
define('__XE_LOADED_CLASS__', true);

include $XE_PATH . 'config/config.inc.php';

$XE_WEB_PATH = substr($XE_PATH,strlen($_SERVER['DOCUMENT_ROOT']));
if(substr($XE_WEB_PATH,-1) != "/") $XE_WEB_PATH .= "/";
$cache_path = $XE_PATH . 'files/cache/optimized/';
$type = $_GET['t'];
$list_file = $cache_path . $_GET['l'];

// check
if(!file_exists($list_file)) exit;
$list = include($list_file);
if(!is_array($list)) exit;

function getRealPath($file){
	global $XE_PATH;
	if($file{0}=='.' && $file{1} =='/') $file = $XE_PATH.substr($file, 2);
	return $file;
}

function getMtime($file){
	$file = getRealPath($file);
	if(file_exists($file)) return filemtime($file);
}

function getMaxMtime($list){
	$mtime = array();
	foreach($list as $file) $mtime[] = getMtime($file);
	return max($mtime);
}

// max mtime
$mtime = getMaxMtime(array_merge($list,array($list_file)));
if($type == '.css'){
	$content_type = 'text/css';
} else if($type == '.js') {
	$content_type = 'text/javascript';
}

header("Content-Type: ".$content_type."; charset=UTF-8");

// return 304
if (!empty($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
    $modifiedSince = strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']);
    if ($modifiedSince && ($modifiedSince == $mtime)) {
		header('HTTP/1.1 304 Not Modified');
		header("Connection: close");
		exit;
    }
}

header("Cache-Control: private, max-age=2592000"); 
header("Pragma: cache"); 
header("Connection: close"); 
header("Last-Modified: " . substr(gmdate('r', $mtime), 0, -5). "GMT");
header("ETag: \"". md5(join(' ', $list)) .'-'. dechex($mtime)."\""); 

function printFileList($list){
    $output = '';
	for($i=0,$c=count($list);$i<$c;$i++){
		$file = getRealPath($list[$i]);
		if(file_exists($file)){
            $output .= file_get_contents($file);
            $output .= "\n";
		}
	}

	if( (defined('__OB_GZHANDLER_ENABLE__') && __OB_GZHANDLER_ENABLE__ == 1) 
		&& strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip')!==false 
		&& function_exists('ob_gzhandler') 
		&& extension_loaded('zlib')) {

	    header("Content-Encoding: gzip");
		$output = ob_gzhandler($output, 5);
	}
	header("Content-Length: ". strlen($output)); 
	echo $output;
}

if($type == '.css'){
	function convertEncodingStr($str) {
		$charset_list = array(
				'UTF-8', 'EUC-KR', 'CP949', 'ISO8859-1', 'EUC-JP', 'SHIFT_JIS', 'CP932',
				'EUC-CN', 'HZ', 'GBK', 'GB18030', 'EUC-TW', 'BIG5', 'CP950', 'BIG5-HKSCS',
				'ISO2022-CN', 'ISO2022-CN-EXT', 'ISO2022-JP', 'ISO2022-JP-2', 'ISO2022-JP-1',
				'ISO8859-6', 'ISO8859-8', 'JOHAB', 'ISO2022-KR', 'CP1255', 'CP1256', 'CP862',
				'ASCII', 'ISO8859-1', 'ISO8850-2', 'ISO8850-3', 'ISO8850-4', 'ISO8850-5',
				'ISO8850-7', 'ISO8850-9', 'ISO8850-10', 'ISO8850-13', 'ISO8850-14',
				'ISO8850-15', 'ISO8850-16', 'CP1250', 'CP1251', 'CP1252', 'CP1253', 'CP1254',
				'CP1257', 'CP850', 'CP866',
				);

		for($i=0;$i<count($charset_list);$i++) {
			$charset = $charset_list[$i];
			if($str){
				$cstr = iconv($charset,$charset,$str);
				if($str == $cstr);
				return $cstr;
			}
		}

		return $str;
	}

	function write($file_name, $buff, $mode='w'){
		$file_name = getRealPath($file_name);
		if(@!$fp = fopen($file_name,$mode)) return false;
		fwrite($fp, $buff);
		fclose($fp);
		@chmod($file_name, 0644);
	}

	function read($file_name) {
		$file_name = getRealPath($file_name);

		if(!file_exists($file_name)) return;
		$filesize = filesize($file_name);
		if($filesize<1) return;

		if(function_exists('file_get_contents')) return file_get_contents($file_name);

		$fp = fopen($file_name, "r");
		$buff = '';
		if($fp) {
			while(!feof($fp) && strlen($buff)<=$filesize) {
				$str = fgets($fp, 1024);
				$buff .= $str;
			}
			fclose($fp);
		}
		return $buff;
	}

	function makeCacheFileCSS($css_file, $cache_file){
		$str = read($css_file);
		$str = replaceCssPath($css_file, trim(convertEncodingStr($str)));
		write($cache_file, $str."\n");
		unset($str);
	}

	function replaceCssPath($file, $str) {
		global $tmp_css_path;

		// css 파일의 위치를 구함
		$tmp_css_path = preg_replace("/^\.\//is","",dirname($file))."/";
		// url() 로 되어 있는 css 파일의 경로를 변경
		$str = preg_replace_callback('/url\(([^\)]*)\)/is', '_replaceCssPath', $str);

		// charset 지정 문구를 제거
		$str = preg_replace('!@charset([^;]*?);!is','',$str);

		return $str;
	}

	function _replaceCssPath($matches) {
		global $tmp_css_path, $XE_WEB_PATH;

		$path = str_replace(array('"',"'"),'',$matches[1]);
		if(substr($path,0,1)=='/' || strpos($path,'://')!==false || strpos($path,'.htc')!==false) return 'url('.$path.')';
		if(substr($path,0,2)=='./') $path = substr($path,2);
		$target = $XE_WEB_PATH.$tmp_css_path.$path;
		while(strpos($target,'/../')!==false) {
			$target = preg_replace('/\/([^\/]+)\/\.\.\//','/',$target);
		}

		return 'url('.$target.')';
	}

	foreach($list as $file){
		$cache_file = $cache_path . md5($file);
		$cache_mtime = getMtime($cache_file);
		$css_mtime = getMtime($file);

		// check modified
		if($css_mtime > $cache_mtime){
			makeCacheFileCSS($file, getRealPath($cache_file));
		}
		$css[] = getRealPath($cache_file);
	}

	printFileList($css);
}else{
	printFileList($list);
}
?>