The error is two-fold:

First, there is a plain error in the LdapContrib user mapper that did not consider the cases the wikinameToEmails() function is called with a login or a group name.

Second, nor did the standard mapper. However, the reason for its failure is in Foswiki::Users.pm as it tries to get the correct mapper for a given wikiname. It fails to use the correct mapper if Foswiki::Users::findUserByWikiName() is called with a login name.

Here's the patch. Please check:

--- lib/Foswiki/Users.pm        (revision 2063)
+++ lib/Foswiki/Users.pm        (working copy)
@@ -472,7 +472,7 @@

     # Trim the (pointless) userweb, if present
     $wn =~ s/^($Foswiki::cfg{UsersWebName}|%USERSWEB%|%MAINWEB%)\.//;
-    my $mapping = $this->_getMapping( undef, undef, $wn );
+    my $mapping = $this->_getMapping( $wn, $wn, $wn );
     return $mapping->findUserByWikiName($wn);
 }

-- MichaelDaum - 20 Jan 2009

Actually, instead of forcing login names to work on functions that take a wiki name - like findUserByWikiName() is wrong. And this never worked. As a consequence the Func docu needs to be changed only.

-- MichaelDaum - 20 Jan 2009

Released as LdapContrib v.2.99.11

-- MichaelDaum - 20 Jan 2009