Remove unavailable characters when encoding page title to ISO-8859-1tc-page-title-encoding-fix

The Page-Title header has to be ISO-8859-1, so when converting the
title to that encoding, remove characters that are not available.

Closes gitlab-org/gitlab-ce#39179.

1 files changed, 5 insertions, 0 deletions

diff --git a/lib/gitlab/encoding_helper.rb b/lib/gitlab/encoding_helper.rb
index 7b3483a7f96..0efeecd7d4a 100644
--- a/lib/gitlab/encoding_helper.rb
+++ b/lib/gitlab/encoding_helper.rb
@@ -64,6 +64,11 @@ module Gitlab
       end
     end
 
+    # Convert all characters to the desired encoding, and drop the characters not available in that encoding
+    def lossy_encode(message, encoding)
+      message.encode(encoding, invalid: :replace, undef: :replace, replace: '')
+    end
+
     private
 
     def clean(message)