From 31d2048eb83d60007183cec43a54d7a112d7a3b2 Mon Sep 17 00:00:00 2001
From: Georg Ehrke <developer@georgehrke.com>
Date: Tue, 24 Sep 2013 11:00:08 +0200
Subject: [PATCH] add blacklist to txt preview backend

---
 lib/preview/txt.php | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/lib/preview/txt.php b/lib/preview/txt.php
index a487330691..77e728eb36 100644
--- a/lib/preview/txt.php
+++ b/lib/preview/txt.php
@@ -9,11 +9,21 @@ namespace OC\Preview;
 
 class TXT extends Provider {
 
+	private static $blacklist = array(
+		'text/calendar',
+		'text/vcard',
+	);
+
 	public function getMimeType() {
 		return '/text\/.*/';
 	}
 
 	public function getThumbnail($path, $maxX, $maxY, $scalingup, $fileview) {
+		$mimetype = $fileview->getMimeType($path);
+		if(in_array($mimetype, self::$blacklist)) {
+			return false;
+		}
+
 		$content = $fileview->fopen($path, 'r');
 		$content = stream_get_contents($content);