From dc664fc31812574c6ed524b216efa8b8d5bb0483 Mon Sep 17 00:00:00 2001
From: OFF0 <offbyn@protonmail.com>
Date: Tue, 20 Dec 2022 22:19:42 +0100
Subject: [PATCH] content: exclude links to ip addresses

There is no good reason to link to an ip directly.

Excluding links that look like ipv4 or ipv6.
---
 src/domutil.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/domutil.js b/src/domutil.js
index bbfe9e1..d42aa68 100644
--- a/src/domutil.js
+++ b/src/domutil.js
@@ -38,6 +38,12 @@ function isValidURL(url) {
     if (url.hostname.slice(lastDot) === '.local') {
         return false;
     }
+    if (url.hostname.slice(lastDot + 1).match(/^[\d]+$/)) { // there should be no tld with numbers, possible ipv4
+        return false;
+    }
+    if (url.hostname.includes(':')) { // possibly an ipv6 addr; certainly an invalid hostname
+        return false;
+    }
     return true;
 }