Someone else has written a (imho) better plugin. I have a backlog of tweaks to do to this plugin to make it work on more systems which I haven’t got around to blogging/integrating. Note that this new plugin does not support using your blog as an OpenID server. It does, however, support sreg (but not hCard) and integrates into the WordPress account system.

I have modified Alexander Nikulin’s plugin for WordPress that enables users to leave authenticated comments using OpenID and enables blog owners/contributors to use the blog as their OpenId. I have made the plugin compatible with WordPress 2.0, cleaned up the validity of the XHTML produced, and fixed a bug that kept some sites from finding the server.

It is reccomended that when using the server the blog admin use the blogs main URL as their OpenID but that other users/contributors use BLOGURL/?author_name=USERNAME.

When returning to the post page after posting a comment, if the comment was held for moderation ?moderated=true is appended to the URL. Adding code like the following will alert your users to this fact:

Possible future features:

• Support for sreg / hCards to get an actual name for the commentor instead of just using their URL
• Support for sreg / hCards in the server implementation
• Support for YADIS

Download the plugin

To install the plugin:

1. Download the gzip from the link above and unzip it
2. Upload the resulting folder into your /wp-content/plugins/ directory
3. Edit your template and replace your comments form code (likely in comments.php) with
   <?php include dirname(__FILE__).’/../../plugins/openid/openidform.php’; ?>