From d5690203fcd88f019e9c71a3411643e3cb8839d1 Mon Sep 17 00:00:00 2001
From: Chris Mayo <aklhfex@gmail.com>
Date: Sat, 8 Aug 2020 16:47:31 +0100
Subject: [PATCH] Fix critical exception when parsing a URL with a ]

e.g.:
<a href="http://localhost]">square</a>

Causes urllib to raise a ValueError:
  File "/usr/lib/python3.8/site-packages/linkcheck/url.py", line 315, in url_norm
    line: urlparts = list(urllib.parse.urlsplit(url))
    locals:
      urlparts = <not found>
      list = <builtin> <class 'list'>
      urllib = <global> <module 'urllib' from '/usr/lib/python3.8/urllib/__init__.py'>
      urllib.parse = <global> <module 'urllib.parse' from '/usr/lib/python3.8/urllib/parse.py'>
      urllib.parse.urlsplit = <global> <function urlsplit at 0x7f950e699e50>
      url = <local> 'http://localhost]', len = 17
  File "/usr/lib/python3.8/urllib/parse.py", line 440, in urlsplit
    line: raise ValueError("Invalid IPv6 URL")
    locals:
      ValueError = <builtin> <class 'ValueError'>
---
 linkcheck/checker/const.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/linkcheck/checker/const.py b/linkcheck/checker/const.py
index 0289cbbd..f473ad02 100644
--- a/linkcheck/checker/const.py
+++ b/linkcheck/checker/const.py
@@ -27,6 +27,7 @@ from dns.exception import DNSException
 # Catch these exception on syntax checks.
 ExcSyntaxList = [
     LinkCheckerError,
+    ValueError,
 ]
 
 # Catch these exceptions on content and connect checks. All other