Static asset resource for webmachine.rb

routes.rb

    app.routes do
      add ['*'], Resources::Static
    end

static.rb

  module Resources
    # Renders files on disk
    class Static < Webmachine::Resource
      def content_types_provided
        # TODO replace this list with something sane / complete, package as a
        # standalone library.
        [
          ['application/ecmascript', :to_bytes],
          ['application/javascript', :to_bytes],
          ['application/xml', :to_bytes],
          ['image/png', :to_bytes],
          ['text/css', :to_bytes],
          ['text/ecmascript', :to_bytes],
          ['text/html', :to_bytes],
          ['text/javascript', :to_bytes],
          ['text/xml', :to_bytes],
        ]
      end

      def resource_exists?
        File.file? map_path(request.uri.path)
      end

      def to_bytes
        # FIXME stream results
        IO.read map_path(request.uri.path)
      end

      private

      def map_path(path)
        path = path.sub %r{^/}, ''
        path = File.expand_path(path, static_root)
        path if path.start_with?(static_root)
      end

      def static_root
        File.expand_path('../../public', File.dirname(__FILE__))
      end
    end
  end