app.rb

class MyAwesomeMoneyMakingService <  Padrino::Application
  register Authorization

  get :edit,  :with => :permalink, :authorize_with => :admin do
      # Edit interface, I guess.
  end

  post  :destroy, :with => :permalink, :authorize_with => :matainers do
    @post = #  ...
    @post.destroy
  end
end

authorization.rb

module Authorization

  def self.registered(app)
    app.helpers Authorization::Helpers
  end

  def authorize_with(strategy)
    case strategy
      when :admin
        current_account.role == "admin" || current_account.role == "editor" || params[:development] == "1"
      when :mantainers
        current_account.role == "mantainers"
    end
  end

  module Helpers
    def authorize(username, password)
      # some authentication code
    end
  end
end