From 617de811f786dd9282ad52c062a58072027f5637 Mon Sep 17 00:00:00 2001
From: Bart Visscher <bartv@thisnet.nl>
Date: Fri, 15 Jun 2012 12:07:31 +0200
Subject: [PATCH] Cache the minimized output also on the server

---
 core/minimizer.php |  4 ++--
 lib/minimizer.php  | 22 +++++++++++++++++++---
 lib/request.php    | 25 +++++++++++++++++++++++++
 3 files changed, 46 insertions(+), 5 deletions(-)
 create mode 100644 lib/request.php

diff --git a/core/minimizer.php b/core/minimizer.php
index 709c7508e90..47e3d855e7b 100644
--- a/core/minimizer.php
+++ b/core/minimizer.php
@@ -6,10 +6,10 @@ OC_App::loadApps();
 if ($service == 'core.css'){
 	$minimizer = new OC_Minimizer_CSS();
 	$files = $minimizer->findFiles(OC_Util::$core_styles);
-	$minimizer->output($files);
+	$minimizer->output($files, $service);
 }
 else if ($service == 'core.js'){
 	$minimizer = new OC_Minimizer_JS();
 	$files = $minimizer->findFiles(OC_Util::$core_scripts);
-	$minimizer->output($files);
+	$minimizer->output($files, $service);
 }
diff --git a/lib/minimizer.php b/lib/minimizer.php
index 9f9ef086c4a..428fa477f77 100644
--- a/lib/minimizer.php
+++ b/lib/minimizer.php
@@ -26,14 +26,30 @@ abstract class OC_Minimizer
 
 	abstract public function minimizeFiles($files);
 
-	public function output($files) {
+	public function output($files, $cache_key) {
 		header('Content-Type: '.$this->contentType);
 		OC_Response::enableCaching();
 		$last_modified = $this->getLastModified($files);
 		OC_Response::setLastModifiedHeader($last_modified);
 
-		$out = $this->minimizeFiles($files);
-		OC_Response::setETagHeader(md5($out));
+		$gzout = false;
+		$cache = new OC_Cache_FileGlobal();
+		if (!OC_Request::isNoCache() && (!defined('DEBUG') || !DEBUG)){
+			$gzout = $cache->get($cache_key.'.gz');
+			OC_Response::setETagHeader(md5($gzout));
+		}
+
+		if (!$gzout) {
+			$out = $this->minimizeFiles($files);
+			$gzout = gzencode($out);
+			$cache->set($cache_key.'.gz', $gzout);
+		}
+		if ($encoding = OC_Request::acceptGZip()) {
+			header('Content-Encoding: '.$encoding);
+			$out = $gzout;
+		} else {
+			$out = gzdecode($gzout);
+		}
 		header('Content-Length: '.strlen($out));
 		echo $out;
 	}
diff --git a/lib/request.php b/lib/request.php
new file mode 100644
index 00000000000..d152d0c73ba
--- /dev/null
+++ b/lib/request.php
@@ -0,0 +1,25 @@
+<?php
+/**
+ * Copyright (c) 2012 Bart Visscher <bartv@thisnet.nl>
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+class OC_Request {
+	static public function isNoCache() {
+		if (!isset($_SERVER['HTTP_CACHE_CONTROL'])) {
+			return false;
+		}
+		return $_SERVER['HTTP_CACHE_CONTROL'] == 'no-cache';
+	}
+
+	static public function acceptGZip() {
+		$HTTP_ACCEPT_ENCODING = $_SERVER["HTTP_ACCEPT_ENCODING"];
+		if( strpos($HTTP_ACCEPT_ENCODING, 'x-gzip') !== false )
+			return 'x-gzip';
+		else if( strpos($HTTP_ACCEPT_ENCODING,'gzip') !== false )
+			return 'gzip';
+		return false;
+	}
+}
-- 
2.39.5