1 files changed, 64 insertions, 0 deletions
diff --git a/lib/private/minimizer.php b/lib/private/minimizer.php
new file mode 100644
index 00000000000..db522de74dc
--- /dev/null
+++ b/lib/private/minimizer.php
@@ -0,0 +1,64 @@
+<?php
+
+abstract class OC_Minimizer {
+	public function generateETag($files) {
+		$fullpath_files = array();
+		foreach($files as $file_info) {
+			$fullpath_files[] = $file_info[0] . '/' . $file_info[2];
+		}
+		return OC_Cache::generateCacheKeyFromFiles($fullpath_files);
+	}
+
+	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));
+	}
+}