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<?php
abstract class OC_Minimizer {
public function generateETag($files) {
$etag = '';
sort($files);
foreach($files as $file_info) {
$file = $file_info[0] . '/' . $file_info[2];
$stat = stat($file);
$etag .= $file.$stat['mtime'].$stat['size'];
}
return md5($etag);
}
abstract public function minimizeFiles($files);
public function output($files, $cache_key) {
header('Content-Type: '.$this->contentType);
OC_Response::enableCaching();
$etag = $this->generateETag($files);
$cache_key .= '-'.$etag;
$gzout = false;
$cache = OC_Cache::getGlobalCache();
if (!OC_Request::isNoCache() && (!defined('DEBUG') || !DEBUG)) {
OC_Response::setETagHeader($etag);
$gzout = $cache->get($cache_key.'.gz');
}
if (!$gzout) {
$out = $this->minimizeFiles($files);
$gzout = gzencode($out);
$cache->set($cache_key.'.gz', $gzout);
OC_Response::setETagHeader($etag);
}
// on some systems (e.g. SLES 11, but not Ubuntu) mod_deflate and zlib compression will compress the output twice.
// This results in broken core.css and core.js. To avoid it, we switch off zlib compression.
// Since mod_deflate is still active, Apache will compress what needs to be compressed, i.e. no disadvantage.
if(function_exists('apache_get_modules') && ini_get('zlib.output_compression') && in_array('mod_deflate', apache_get_modules())) {
ini_set('zlib.output_compression', 'Off');
}
if ($encoding = OC_Request::acceptGZip()) {
header('Content-Encoding: '.$encoding);
$out = $gzout;
} else {
$out = gzdecode($gzout);
}
header('Content-Length: '.strlen($out));
echo $out;
}
public function clearCache() {
$cache = OC_Cache::getGlobalCache();
$cache->clear('core.css');
$cache->clear('core.js');
}
}
if (!function_exists('gzdecode')) {
function gzdecode($data,$maxlength=null,&$filename='',&$error='')
{
if (strcmp(substr($data,0,9),"\x1f\x8b\x8\0\0\0\0\0\0")) {
return null; // Not the GZIP format we expect (See RFC 1952)
}
return gzinflate(substr($data,10,-8));
}
}
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