[xwiki-users] Need some guidance to use/access XWikiLDAPAuthServiceImpl methods via Groovy

We are using LDAP authentication scheme and are trying to develop a feature wherein we can register any given user before he/she authenticates for the first time. This will allow us to add users to appropriate access control lists so that they are fully setup before they ever authenticate. To do so, I was thinking of using Groovy to access the XWikiLDAPAuthServiceImpl class to perform functions such as first verifying that the LDAP uid is valid and then perform the actual creation using createUserFromLDAP() method call. I am unable to get basic Groovy access to any method in the above class working. I would appreciate if someone could guide me with the basic skeleton to access the class or maybe even the actual authenticator object in the current context. Thanks, Milind