Serving up static files outside of Public with Sinatra. Good for putting static files behind your auth wall.

app.rb

require 'pathname'
require 'sinatra/base'

module MyApp
  module_function
  def root
    Pathname.new(__FILE__).dirname
  end
end

class StaticEngine < Sinatra::Base

  PATH = MyApp.root.join('static')

  get %r{/static/(.*)} do
    filename = params[:captures].first
    fullpath = PATH.join(filename).expand_path

    # Checks to make sure the requested path is a subdirectory of 'static'
    if /^#{PATH}/ =~ fullpath.to_s then
      send_file  fullpath
    else
      halt 404
    end
  end

end

class App < Sinatra::Base
  use StaticEngine
end