how to add a method without coding it directly into app?

[ronald.evangelista]

i'm missing something here.
how would I code this outside the application to be shared with other 
Camping apps?

module Blog::Controllers
    module AuthenticationHelper
        def self.included(base)
            class << base
                define_method :authenticate do |*a|
                    a.each do |meth|
                        if method_defined?(meth.to_s)
                            alias_method "__#{meth}__", meth
                            class_def(meth) do |*a|
                                @state.Back=@env.REQUEST_URI
                                return redirect(Login) if @state.blank? 
or @state.user_id.nil?
                                send("__#{meth}__", *a)
                            end
                        end
                    end
                end
            end
        end
    end
end

any hints? thanks!