Error when trying to login to a wiki using openid when the wiki doesn't run under "/"

[Andrew Glen-Young]

Description:

Moin will return an error when logging in using OpenID when the wiki doesn't run under '/'.

The problem seems to be that we use PATH_INFO to redirect the request to the original page. Unfortunately this seems to not include the wiki's root directory.

i.e.

If the wiki is served from the site's '/' location:
 * wiki.example.com/foo redirect the login to /foo
 * login succeeds

If the wiki is served from the site's '/wiki' location:
 * wiki.example.com/wiki/foo redirect the login to /foo (and not /wiki/foo)
 * login fails

Steps to reproduce:

 1. Create a wiki which is served from /wiki
 2. Being logged out, log in.
 3. Enter your Launchpad details.
 4. Return to the wiki, but you're not logged in.

I have attached a quick patch to try to remedy the problem as well as the relevant Apache virtual host config and MoinMoin fastcgi script.