From 59669cb6c9e720095d60680ba0b31cdc1390e660 Mon Sep 17 00:00:00 2001
From: bohwaz <github.bohwaz@miam.kd2.org>
Date: Fri, 23 Dec 2022 20:42:01 +0100
Subject: [PATCH] Limit gzip compression to smaller files, also exclude other
 kinds of files

---
 index.php | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/index.php b/index.php
index 52864ee..daecd05 100644
--- a/index.php
+++ b/index.php
@@ -34,6 +34,8 @@ namespace KD2\WebDAV
 		const SHARED_LOCK = 'shared';
 		const EXCLUSIVE_LOCK = 'exclusive';
 
+		protected bool $enable_gzip = true;
+
 		protected string $base_uri;
 
 		public string $original_uri;
@@ -344,17 +346,20 @@ namespace KD2\WebDAV
 
 				$this->log('HTTP Range requested: %s-%s', $start, $end);
 			}
-			elseif (isset($_SERVER['HTTP_ACCEPT_ENCODING'])
+			elseif ($this->enable_gzip
+				&& isset($_SERVER['HTTP_ACCEPT_ENCODING'])
 				&& false !== strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip')
+				&& isset($props['DAV::getcontentlength'])
+				// Don't compress if size is larger than 8 MiB
+				&& $props['DAV::getcontentlength'] < 8*1024*1024
 				// Don't compress already compressed content
-				&& !preg_match('/\.(?:mp4|m4a|zip|docx|xlsx|ods|odt|odp|7z|gz|bz2|rar|webm|ogg|mp3|ogm|flac|ogv|mkv|avi)$/i', $uri)) {
+				&& !preg_match('/\.(?:cbz|cbr|cb7|mp4|m4a|zip|docx|xlsx|pptx|ods|odt|odp|7z|gz|bz2|lzma|lz|xz|apk|dmg|jar|rar|webm|ogg|mp3|ogm|flac|ogv|mkv|avi)$/i', $uri)) {
 				$gzip = true;
 				header('Content-Encoding: gzip', true);
 			}
 
 			// Try to avoid common issues with output buffering and stuff
-			if (function_exists('apache_setenv'))
-			{
+			if (function_exists('apache_setenv')) {
 				@apache_setenv('no-gzip', 1);
 			}
 
@@ -436,7 +441,7 @@ namespace KD2\WebDAV
 
 			if ($gzip) {
 				$this->log('Using gzip output compression');
-				$gzip = deflate_init(ZLIB_ENCODING_GZIP, ['level' => 9]);
+				$gzip = deflate_init(ZLIB_ENCODING_GZIP);
 
 				$fp = fopen('php://temp', 'wb');
 
@@ -1883,11 +1888,11 @@ RewriteRule ^.*$ /index.php [END]
 		$fp = fopen(__FILE__, 'r');
 
 		if ($relative_uri == '.webdav/webdav.js') {
-			fseek($fp, 50401, SEEK_SET);
+			fseek($fp, 50637, SEEK_SET);
 			echo fread($fp, 27769);
 		}
 		else {
-			fseek($fp, 50401 + 27769, SEEK_SET);
+			fseek($fp, 50637 + 27769, SEEK_SET);
 			echo fread($fp, 7004);
 		}