From 4d40b9c971fecfd270491e00e0f40c4e41fb1c82 Mon Sep 17 00:00:00 2001
From: Einar Egilsson <einar@einaregilsson.com>
Date: Wed, 23 Sep 2015 12:34:44 +0000
Subject: Redirect loop protection

---
 js/background.js | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

(limited to 'js')

diff --git a/js/background.js b/js/background.js
index 16c052f..f65b10b 100644
--- a/js/background.js
+++ b/js/background.js
@@ -9,7 +9,6 @@ function log(msg) {
 log.enabled = false;
 
 
-//TODO: Better browser detection...
 var isFirefox = false;
 
 if (typeof chrome == 'undefined') {
@@ -37,6 +36,12 @@ var ignoreNextRequest = {
 
 };
 
+//url => { timestamp:ms, count:1...n};
+var justRedirected = {
+
+};
+var redirectThreshold = 3;
+
 function setIcon(image) {
 	var data = { 
 		path: {
@@ -84,12 +89,30 @@ function checkRedirects(details) {
 		return {};
 	}
 
+
 	for (var i = 0; i < list.length; i++) {
 		var r = list[i];
 		var result = r.getMatch(details.url);
 
 		if (result.isMatch) {
 
+			//Check if we're stuck in a loop where we keep redirecting this, in that
+			//case ignore!
+			var data = justRedirected[details.url];
+
+			var threshold = 3000;
+			if(!data || ((new Date().getTime()-data.timestamp) > threshold)) { //Obsolete after 3 seconds
+				justRedirected[details.url] = { timestamp : new Date().getTime(), count: 1};
+			} else {
+				data.count++;
+				justRedirected[details.url] = data;
+				if (data.count >= redirectThreshold) {
+					log('Ignoring ' + details.url + ' because we have redirected it ' + data.count + ' times in the last ' + threshold + 'ms');
+					return {};
+				} 
+			}
+
+
 			log('Redirecting ' + details.url + ' ===> ' + result.redirectTo + ', type: ' + details.type + ', pattern: ' + r.includePattern);
 
 			ignoreNextRequest[result.redirectTo] = new Date().getTime();
-- 
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