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<?php
/**
* JCH Optimize - Aggregate and minify external resources for optmized downloads
*
* @author Samuel Marshall <sdmarshall73@gmail.com>
* @copyright Copyright (c) 2010 Samuel Marshall
* @license GNU/GPLv3, See LICENSE file
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* If LICENSE file missing, see <http://www.gnu.org/licenses/>.
*/
defined('_JCH_EXEC') or die('Restricted access');
class JchOptimizeOutput
{
/**
*
* @return type
*/
public static function getCombinedFile($aGet=array(), $bSend=true)
{
if (empty($aGet))
{
$aGet = self::getArray(array(
'f' => 'alnum',
'i' => 'int',
'type' => 'word'
));
}
$aCache = JchPlatformCache::getCache($aGet['f']);
if ($aCache === FALSE)
{
return false;
}
if($bSend)
{
$aTimeMFile = self::RFC1123DateAdd($aCache['filemtime'], '1 year');
$sTimeMFile = $aTimeMFile['filemtime'] . ' GMT';
$sExpiryDate = $aTimeMFile['expiry'] . ' GMT';
$sModifiedSinceTime = '';
$sNoneMatch = '';
if (function_exists('apache_request_headers'))
{
$headers = apache_request_headers();
if (isset($headers['If-Modified-Since']))
{
$sModifiedSinceTime = strtotime($headers['If-Modified-Since']);
}
if (isset($headers['If-None-Match']))
{
$sNoneMatch = $headers['If-None-Match'];
}
}
if ($sModifiedSinceTime == '' && isset($_SERVER['HTTP_IF_MODIFIED_SINCE']))
{
$sModifiedSinceTime = strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']);
}
if ($sNoneMatch == '' && isset($_SERVER['HTTP_IF_NONE_MATCH']))
{
$sNoneMatch = $_SERVER['HTTP_IF_NONE_MATCH'];
}
$sEtag = $aCache['etag'];
if ($sModifiedSinceTime == strtotime($sTimeMFile) || trim($sNoneMatch) == $sEtag)
{
// Client's cache IS current, so we just respond '304 Not Modified'.
header('HTTP/1.1 304 Not Modified');
header('Content-Length: 0');
return;
}
else
{
header('Last-Modified: ' . $sTimeMFile);
}
}
$sFile = $aCache['file'][$aGet['i']];
$sFile = JchOptimizeOutput::getCachedFile($sFile);
$aSpriteCss = $aCache['spritecss'];
if (($aGet['type'] == 'css'))
{
if (is_array($aSpriteCss) && !empty($aSpriteCss) && isset($aSpriteCss['needles']) && $aSpriteCss['replacements'])
{
$sFile = str_replace($aSpriteCss['needles'], $aSpriteCss['replacements'], $sFile);
}
$oCssParser = new JchOptimizeCssParser();
$sFile = $oCssParser->sortImports($sFile);
if (function_exists('mb_convert_encoding'))
{
$sFile = '@charset "utf-8";' . $sFile;
}
}
if (!$bSend)
{
return $sFile;
}
if ($aGet['type'] == 'css')
{
header('Content-type: text/css');
}
elseif ($aGet['type'] == 'js')
{
header('Content-type: application/javascript');
}
header('Expires: ' . $sExpiryDate);
header('Accept-Ranges: bytes');
header('Cache-Control: Public');
header('Vary: Accept-Encoding');
header('Etag: ' . $sEtag);
$gzip = TRUE;
if (isset($_SERVER['HTTP_USER_AGENT']))
{
/* Facebook User Agent
* facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)
* LinkedIn User Agent
* LinkedInBot/1.0 (compatible; Mozilla/5.0; Jakarta Commons-HttpClient/3.1 +http://www.linkedin.com)
*/
$pattern = strtolower('/facebookexternalhit|LinkedInBot/x');
if (preg_match($pattern, strtolower($_SERVER['HTTP_USER_AGENT'])))
{
$gzip = FALSE;
}
}
if (isset($aGet['gz']) && $aGet['gz'] == 'gz' && $gzip)
{
$aSupported = array(
'x-gzip' => 'gz',
'gzip' => 'gz',
'deflate' => 'deflate'
);
if (isset($_SERVER['HTTP_ACCEPT_ENCODING']))
{
$aAccepted = array_map('trim', (array) explode(',', $_SERVER['HTTP_ACCEPT_ENCODING']));
$aEncodings = array_intersect($aAccepted, array_keys($aSupported));
}
else
{
$aEncodings = array('gzip');
}
if (!empty($aEncodings))
{
foreach ($aEncodings as $sEncoding)
{
if (($aSupported[$sEncoding] == 'gz') || ($aSupported[$sEncoding] == 'deflate'))
{
$sGzFile = gzencode($sFile, 4, ($aSupported[$sEncoding] == 'gz') ? FORCE_GZIP : FORCE_DEFLATE);
if ($sGzFile === FALSE)
{
continue;
}
header('Content-Encoding: ' . $sEncoding);
$sFile = $sGzFile;
break;
}
}
}
}
echo $sFile;
}
/**
*
* @param type $sContent
* @return type
*/
public static function getCachedFile($sContent)
{
$sContent = preg_replace_callback('#\[\[JCH_([^\]]++)\]\]#',
function($aM)
{
return JchPlatformCache::getCache($aM[1]);
}, $sContent);
return $sContent;
}
/**
*
* @param type $array
* @return type
*/
private static function getArray($array)
{
$gz = isset($_GET['gz']) ? 'gz' : 'nz';
$array[$gz] = 'word';
$aGet = array();
foreach($array as $key => $value)
{
switch($value)
{
case 'alnum':
$aGet[$key] = preg_replace('#[^0-9a-f]#', '', $_GET[$key]);
break;
case 'int':
$aGet[$key] = preg_replace('#[^0-9]#', '', $_GET[$key]);
break;
case 'word':
default:
$aGet[$key] = preg_replace('#[^a-zA-Z]#', '', $_GET[$key]);
break;
}
}
return $aGet;
}
/**
*
* @param type $filemtime
* @param type $days
*/
public static function RFC1123DateAdd($filemtime, $period)
{
$aTime = array();
$date = new DateTime();
$date->setTimestamp($filemtime);
$aTime['filemtime'] = $date->format('D, d M Y H:i:s');
$date->add(DateInterval::createFromDateString($period));
$aTime['expiry'] = $date->format('D, d M Y H:i:s');
return $aTime;
}
}