How to use common code in each "map"

["Iñaki Baz Castillo" <ibc@aliax.net>]

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>