Better way to route?

gistfile1.rb

  post :index do
    if params.key?("create")
      path = Padrino.root("tmp")

      File.open(File.join(path, "#{params[:docId]}.pdf"), "w") do |file|
        file.write request.body.read.force_encoding("UTF-8")
        status 200
      end
    end
  end