--[[

Called:

 when AuthLDAP module translates user name to DN

Database:

 available

Parameters:

 user           username

Returned value:

            nil        unknown user

 string     empty      unknown user

            non-empty  DN of user

Procedure from next set will be called if returned nothing.

]]

local args = ... -- args.user

-- example code:

-- if args.user == 'super-admin' then return 'CN=super,DC=example,DC=com' end

-- no return => `nil' value