From 946a1229a126b91de9b64d2def672c628a77e6c6 Mon Sep 17 00:00:00 2001
From: Sem <sembrestels@riseup.net>
Date: Tue, 3 Jan 2012 16:14:31 +0100
Subject: Refs #4142. Also added ETag in group icon.

---
 mod/groups/icon.php | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/mod/groups/icon.php b/mod/groups/icon.php
index f4c0f8010..607f38939 100644
--- a/mod/groups/icon.php
+++ b/mod/groups/icon.php
@@ -10,6 +10,13 @@ require_once(dirname(dirname(dirname(__FILE__))) . "/engine/start.php");
 $group_guid = get_input('group_guid');
 $group = get_entity($group_guid);
 
+// If is the same eTag, content didn't changed.
+$eTag = $group->icontime . $group_guid;
+if (trim($_SERVER['HTTP_IF_NONE_MATCH']) == $eTag) {
+	header("HTTP/1.1 304 Not Modified");
+	exit;
+}
+
 $size = strtolower(get_input('size'));
 if (!in_array($size,array('large','medium','small','tiny','master','topbar')))
 	$size = "medium";
@@ -37,4 +44,5 @@ header('Expires: ' . date('r',time() + 864000));
 header("Pragma: public");
 header("Cache-Control: public");
 header("Content-Length: " . strlen($contents));
+header("ETag: $eTag");
 echo $contents;
-- 
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