At work we have an installation of Dokuwiki which is now slowly but surely being replaced by Jira (because of some context richness being easier in Jira). During this migration we wanted to be able to automatically redirect people to the new Jira entry if the content has been moved. For redirecting within the wiki, we’ve previously used the mredirect plugin, but we recently found it has a bug in handling redirect to an external URL.

So, here’s the patch:

$ diff oldaction.old action.php
25c25,31
<         $url = ($p[2] == '') ? wl($p[1]) : wl($p[1]) . '#' . sectionID($p[2], $check);
---
>         if ($p[2] == '') {
>           if (preg_match("/:\/\//", $p[0])) {
>             $url = preg_replace("/^\[\[/","",preg_replace("/\]\]$/","",$p[0]));
>           } else {
>             $url = wl($p[1]);
>           }
>         } else { $url = wl($p[1]) . '#' . sectionID($p[2], $check); }
31c37
< ?>
\ No newline at end of file
---
> ?>

This is just a very basic check to see whether the matched text contains “://”, which should never be within a Dokuwiki URL path (ie., “http://wiki.domain.tld/ns:entry” or “http://wiki.domain.tld/ns/entry” should be the only paths one can ever run across). If it contains this text, the Dokuwiki bracket syntax is stripped out of the string and the resulting content is the URL (verbatim) to redirect to.

I’ve mailed it to the author of the plugin as well, so hopefully it’ll get patched upstream and work for other people using Dokuwiki too.

Side note: I wonder what the/a nice way to post small diffs like this is instead of just dropping it in a quote on a post. Github’s gist or somesuch?

[Update] plugin author has responded and indicated that the upstream plugin is now updated.
[Update 2] thanks Axu for pointing out that I was asleep as hell when making this patch