Support groups with memberUid instead of memberOf

[jplitza]

There are two ways to represent groups in LDAP: One adds the memberOf attribute to the users of the group, the other adds the memberUid attribute to the group. While combining both is possible, in our setup we only use memberUid, which wasn't supported by Simple-LDAP-Login. This patch adds support.

This isn't the cleanest solution, especially the preg_replace() that kills off any prefixed ou= annoys me, but contrary to what the webinterface says, we had to use ou=People in our base_dn, because that's where our user accounts live (and the plugin tries to authenticate with uid=$username,$base_dn).

[clifgriffin]

@jplitza Happy to consider a PR for this, but I think this was probably fixed in 62e5658.

[jplitza]

I don't have access to that setup anymore, but I think that commit doesn't fix the problem, because it doesn't check for the attribute "memberUid" anywhere.

[clifgriffin]

@jplitza 2169700 should handle it. Allows a custom group UID to be stored in settings.

[phyrog]

I'm not sure that this is fixed. As far as I can see, you can now specify the attribute of the user that contains the group ids. What we need instead is to check the groups for an attribute that contains the user ids.

If I'm wrong, please tell :)