From bdcca24f8d189cb0f0454f61db9d00e5292b1154 Mon Sep 17 00:00:00 2001
From: Shish <shish@shishnet.org>
Date: Sat, 1 Aug 2009 02:31:49 +0100
Subject: [PATCH] static file caching

---
 core/util.inc.php | 38 ++++++++++++++++++++++++++++++++++++++
 index.php         |  5 ++++-
 2 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/core/util.inc.php b/core/util.inc.php
index bf12be7a..d4a3a560 100644
--- a/core/util.inc.php
+++ b/core/util.inc.php
@@ -718,4 +718,42 @@ function _get_user() {
 	return $user;
 }
 
+function _start_cache() {
+	$_do_cache = (CACHE && !isset($_COOKIE["shm_session"]) && !isset($_COOKIE["shm_nocache"]));
+	if($_do_cache) {
+		$hash = md5($_SERVER["QUERY_STRING"]);
+		$ab = substr($hash, 0, 2);
+		$cd = substr($hash, 2, 2);
+		$cachename = "data/$ab/$cd/$hash";
+		if(!file_exists("data/$ab/$cd/")) {
+			mkdir("data/$ab/$cd/", 0750, true);
+		}
+		if(file_exists($cachename)) {
+			$gmdate_mod = gmdate('D, d M Y H:i:s', filemtime($cachename)) . ' GMT';
+
+			if(isset($_SERVER["HTTP_IF_MODIFIED_SINCE"])) {
+				$if_modified_since = preg_replace('/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"]);
+
+				if($if_modified_since == $gmdate_mod) {
+					header("HTTP/1.0 304 Not Modified");
+					header("Content-type: text/html");
+				}
+			}
+			else {
+				header("Content-type: text/html");
+				header("Last-Modified: $gmdate_mod");
+				print file_get_contents($cachename);
+			}
+			exit;
+		}
+		ob_start();
+	}
+}
+
+function _end_cache() {
+	$_do_cache = (CACHE && !isset($_COOKIE["shm_session"]) && !isset($_COOKIE["shm_nocache"]));
+	if($_do_cache) {
+		file_put_contents($cachename, ob_get_contents());
+	}
+}
 ?>
diff --git a/index.php b/index.php
index dcb5105c..41c462b5 100644
--- a/index.php
+++ b/index.php
@@ -52,6 +52,7 @@
 
 // set up and purify the environment
 define("DEBUG", true);
+define("CACHE", true);
 define("SCORE_VERSION", 's2hack');
 define("VERSION", 'trunk');
 
@@ -63,7 +64,7 @@ if(!file_exists("config.php")) {
 require_once "core/util.inc.php";
 _version_check();
 _sanitise_environment();
-
+_start_cache();
 
 try {
 	// load base files
@@ -125,6 +126,8 @@ try {
 	if($database->engine->name != "sqlite") {
 		$database->db->CommitTrans(true);
 	}
+
+	_end_cache();
 }
 catch(Exception $e) {
 	$version = VERSION;