OpenID allows you to use your own domain as OpenID and to delegate it for authentication purposes to an OpenID server by adding two link tags to the head section of a HTML page. In my case I use http://openid.42dh.com as OpenID and in the head section you will find:
<link rel="openid.server" href="http://www.myopenid.com/server" /> <link rel="openid.delegate" href="http://dh.myopenid.com" />
This approach comes with two potential problems:
- I cannot authenticate myself if my domain is down,
- and the same applies if the OpenID server is down
To the first problem I don’t have a solution yet, but for the second problem the solution is easy. Modify the snippet above and you can still authenticate with your OpenID by using a different OpenID server. It is just a bit cumbersome to login to your server and to do that change manually. So I wrote a very simple CakePHP application which allows you to switch the used OpenID server on-the-fly. It is one of those “15 minutes” projects where it is almost overkill to use CakePHP ;-)
You can find the application in the downloads section. The installation is simple, the zip contains a complete app folder (no database needed). You may have to modify app/webroot/index.php and to make the tmp folder writable, and, of course, you have to add the OpenID servers and delegates you want to use. They are defined in app/models/delegate.php. Now, to change the OpenID server you simply call example.com/change and a different OpenID server will be used.