# File lib/active_ldap/configuration.rb, line 56
      def ensure_configuration(config=nil)
        if config.nil?
          if defined?(LDAP_ENV)
            config = LDAP_ENV
          elsif defined?(RAILS_ENV)
            config = RAILS_ENV
          else
            config = {}
          end
        end

        if config.is_a?(Symbol) or config.is_a?(String)
          _config = configurations[config.to_s]
          unless _config
            raise ConnectionError,
                  _("%s connection is not configured") % config
          end
          config = _config
        end

        config
      end