# File lib/omniauth-ldap/adaptor.rb, line 49
      def self.validate(configuration={})
        message = []
        MUST_HAVE_KEYS.each do |names|
          names = [names].flatten
          missing_keys = names.select{|name| configuration[name].nil?}
          if missing_keys == names
            message << names.join(' or ')
          end
        end
        raise ArgumentError.new(message.join(",") +" MUST be provided") unless message.empty?
      end