require 'net/ssh/errors'
require 'net/ssh/authentication/methods/abstract'

module Net
  module SSH
    module Authentication
      module Methods
        # Implements the "none" SSH authentication method.
        class None < Abstract
          # Attempt to authenticate as "none"
          def authenticate(next_service, user = "", password = "")
            send_message(userauth_request(user, next_service, "none"))
            message = session.next_message

            case message.type
            when USERAUTH_SUCCESS
              debug { "none succeeded" }
              return true
            when USERAUTH_FAILURE
              debug { "none failed" }

              raise Net::SSH::Authentication::DisallowedMethod unless
                message[:authentications].split(/,/).include? 'none'

              return false
            else
              raise Net::SSH::Exception, "unexpected reply to USERAUTH_REQUEST: #{message.type} (#{message.inspect})"
            end
          end
        end
      end
    end
  end
end