Re: How to use common code in each "map"

[Magnus Holm <judofyr@gmail.com>]

It is possible with a middleware:

class Restricter
  def initialize(app, headers = {})
    @app = app
    @headers = headers
  end

  def call(env)
    @headers.each do |key, value|
      unless env[key] == value
        return [403, {}, ['Something']]
      end
    end

    @app.call(env)
  end
end

map "/service1" do
  use Restricter, "SERVER_NAME" => "testing"
  run App1
end

//Magnus Holm



On Thu, Sep 10, 2009 at 17:53, Iñaki Baz Castillo<ibc@aliax.net> wrote:
>
> Hi, I'm trying to use common HTTP request validation code  in each "map" block:
>
> ----------------------------------------------------------------------
> Rack::Builder.new do
>
>  map "/" do
>    run Proc.new { |env| [ 404, {"Content-Type" => "text/plain"}, [""] ] }
>  end
>
>  map "/service1" do
>    ___VALIDATION_CODE___
>    run MyApp1
>  end
>
>  map "/service2" do
>    ___VALIDATION_CODE___
>    run MyApp2
>  end
>
> end
> ----------------------------------------------------------------------
>
>
> Unfortunatelly I don't know how to fill ___VALIDATION_CODE___.
> There I want to inspect env["SERVER_NAME"] and some other headers. In
> case the validation is not passed, it should, *by itself*, return 403
> code and MyApp1 or MyApp2 execution shouldn't take place.
>
> IMHO it means that it cannot be done with a middleware since it would
> execute MyApp1 or MyApp2.
>
> Which is the appropriate approach to achieve it? Thanks for any help. Regards.
>
>
> --
> Iñaki Baz Castillo
> <ibc@aliax.net>
>