    # File lib/rbot/core/auth.rb, line 310
      def auth_login(m, params)
        begin
          case @bot.auth.login(m.source, params[:botuser], params[:password])
          when true
            say_welcome(m)
            @bot.auth.set_changed
          else
            m.reply _("sorry, can't do")
          end
        rescue => e
          m.reply _("couldn't login: %{exception}") % {:exception => e}
          raise
        end
      end