Fix utf8 issues in calls to md5_hex.

This prevented comments containing some utf-8, including euro sign, from
being submitted. Since md5_hex is a C implementation, the string has to be
converted from perl's internal encoding to utf-8 when it is called. Some
utf-8 happened to work before, apparently by accident.

Note that this will change the checksums returned.

unique_comment_location is only used when posting comments, so the checksum
does not need to be stable there.

I only changed page_to_id for completeness; it is passed a comment page
name, and they can currently never contain utf-8.

In teximg, the bug could perhaps be triggered if the tex source contained
utf-8. If that happens, the checksum will change, and some extra work might
be performed on upgrade to rebuild the image.

1 files changed, 2 insertions, 2 deletions

diff --git a/IkiWiki/Plugin/comments.pm b/IkiWiki/Plugin/comments.pm
index 8f8472f07..bbf850a17 100644
--- a/IkiWiki/Plugin/comments.pm
+++ b/IkiWiki/Plugin/comments.pm
@@ -839,7 +839,7 @@ sub unique_comment_location ($$$) {
 
 	eval q{use Digest::MD5 'md5_hex'};
 	error($@) if $@;
-	my $content_md5=md5_hex(shift);
+	my $content_md5=md5_hex(Encode::encode_utf8(shift));
 
 	my $dir=shift;
 
@@ -862,7 +862,7 @@ sub page_to_id ($) {
 	eval q{use Digest::MD5 'md5_hex'};
 	error($@) if $@;
 
-	return "comment-".md5_hex($page);
+	return "comment-".md5_hex(Encode::encode_utf8(($page));
 }
 	
 package IkiWiki::PageSpec;