Hi, I'm currently developing a user facing web application that gives each new user their own subdomain on the site, which is fine (using subdomain_fu), but is there a way to let a user map their own domain to this subdomain?

I know how to do this manually through SSH-ing into the server and editing the Apache Vhosts file by hand, but is there a way to do this automatically so that a user simply enters their domain into a box on the site (obviously they'd have to change their own DNS elsewhere)?

I'm using Ruby 1.8 and Rails 2.3.3 on top of Apache.

Essentially letting;

http://user.application.com/article-1

be accessed from

http://userdomain.com/article-1

Thanks for any help!