From f2e0d5b634324a2981bd63105fb7797506afd2e6 Mon Sep 17 00:00:00 2001
From: KMY <tt@kmycode.net>
Date: Tue, 21 Mar 2023 22:09:38 +0900
Subject: [PATCH] Fix activitypub link href checker to ignore no-url

---
 lib/sanitize_ext/sanitize_config.rb | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/sanitize_ext/sanitize_config.rb b/lib/sanitize_ext/sanitize_config.rb
index fdcb0c450b..f538ca95b6 100644
--- a/lib/sanitize_ext/sanitize_config.rb
+++ b/lib/sanitize_ext/sanitize_config.rb
@@ -54,11 +54,14 @@ class Sanitize
       return unless env[:node_name] == 'a'
 
       current_node = env[:node]
-      href = current_node['href']
+      href = current_node['href'] || ''
       text = current_node.text
       cls = current_node['class'] || ''
 
-      scheme = if current_node['href'] =~ Sanitize::REGEX_PROTOCOL
+      dot_pos = text.index('.')
+      return unless dot_pos.present? && dot_pos > 0 && dot_pos < text.size - 1
+
+      scheme = if href =~ Sanitize::REGEX_PROTOCOL
                  Regexp.last_match(1).downcase
                else
                  :relative