From 9a48fc60d1cce8a344ec7e09293e3d958099486d Mon Sep 17 00:00:00 2001
From: robocoder <anthon.pang@gmail.com>
Date: Fri, 25 Dec 2009 23:12:58 +0000
Subject: Serve up compressed piwik.js if possible. This can be used if user's
 web server (e.g., Apache) doesn't have mod_deflate or mod_gzip when serving
 up piwik.js directly.

git-svn-id: http://dev.piwik.org/svn/trunk@1732 59fd770c-687e-43c8-a1e3-f5a4ff64c105
---
 js/index.php | 46 +++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 39 insertions(+), 7 deletions(-)

(limited to 'js/index.php')

diff --git a/js/index.php b/js/index.php
index 60786f2849..483e5fbabe 100644
--- a/js/index.php
+++ b/js/index.php
@@ -7,18 +7,46 @@
  * @version $Id$
  */
 
-$file = "../piwik.js";
+$file = '../piwik.js';
 
-/*
- * Conditional GET
- */
 if (file_exists($file)) {
+	// conditional GET
 	$modifiedSince = '';
 	if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
 		$modifiedSince = $_SERVER['HTTP_IF_MODIFIED_SINCE'];
 	}
 	$lastModified = gmdate('D, d M Y H:i:s', filemtime($file)) . ' GMT';
 
+	// optional compression
+	$compressed = false;
+	$encoding = '';
+	if (extension_loaded('zlib') && function_exists('file_get_contents') && function_exists('file_put_contents') && isset($_SERVER['HTTP_ACCEPT_ENCODING'])) {
+		$acceptEncoding = $_SERVER['HTTP_ACCEPT_ENCODING'];
+		if (preg_match('/(?:^|, ?)(deflate)(?:,|$)/', $acceptEncoding, $matches)) {
+			$encoding = $matches[1];
+		} else if (preg_match('/(?:^|, ?)((x-)?gzip)(?:,|$)/', $acceptEncoding, $matches)) {
+			$encoding = $matches[1];
+		}
+
+		if (!empty($encoding)) {
+			$filegz = '../piwik.js.' . $encoding;
+
+			if(!file_exists($filegz) || (filemtime($file) > filemtime($filegz))) {
+				$data = file_get_contents($file);
+
+				if ($encoding == 'deflate') {
+					$data = gzcompress($data, 9);
+				} else if ($encoding == 'gzip' || $encoding == 'x-gzip') {
+					$data = gzencode($data, 9);
+				}
+
+				file_put_contents($filegz, $data);
+				$compressed = true;
+				$file = $filegz;
+			}
+		}
+	}
+
 	// strip any trailing data appended to header
 	if (false !== ($semicolon = strpos($modifiedSince, ';'))) {
 		$modifiedSince = substr($modifiedSince, 0, $semicolon);
@@ -29,13 +57,17 @@ if (file_exists($file)) {
 	} else {
 		header('Last-Modified: ' . $lastModified);
 		header('Content-Length: ' . filesize($file));
-		header('Content-Type: application/x-javascript');
+		header('Content-Type: application/x-javascript; charset=UTF-8');
+
+		if ($compressed) {
+			header('Content-Encoding: ' . $encoding);
+		}
 
 		if (!readfile($file)) {
-			header ("HTTP/1.0 505 Internal server error");
+			header ('HTTP/1.0 505 Internal server error');
 		}
 	}
 } else {
-	header ("HTTP/1.0 404 Not Found");
+	header ('HTTP/1.0 404 Not Found');
 }
 exit;
-- 
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