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