router_rewrite.rb

PUBLIC_DEFER_TO_PROC = lambda do |request, params|
  locale = Config::Locale.find(params)
  # Find the page with the closest matching path. If the matching path is 
  # shorter than the one specified, it will still match, since it may actually
  # be a redirect.
  page = Page.first_with_localization(
    :locale_name  => locale[:name]
    :conditions   => ["? LIKE (path || '%')", params[:full_path]], 
    :order        => [:path.asc]
  )
  # If no page matched, 404. If we have a page, but it isn't a redirect and the
  # path isn't an exact match, we also 404.
  if !page || (page.path != params[:full_path] && page.description[:behaviour] != :rewrite)
    raise Merb::ControllerExceptions::NotFound
  end
  # Check to see how we need to hand the request based on the behaviour 
  # specified.
  case page.description[:behaviour]
    when :default
      # Just send it to the default controller specified in the routes.
      {
        :controller => params[:controller], 
        :action     => params[:action], 
        :page       => page, 
        :format     => params[:format],
        :locale     => locale
      }
    when :rewrite
      # Overwrite the REQUEST_PATH with the real controller path and pass it 
      # through the router again to get the params — controller, action etc —
      # into which we can inject our own entries.
      rewrite_path = Merb::Router.url(page.description.rewrite_route)
      request.env["REQUEST_PATH"] = params[:full_path].gsub(page.current_localization.path, rewrite_path)
      new_params = Merb::Router.match(request)[1]
      new_params.merge(:page => page, :locale => locale)
    when :redirect
      # TODO: find out how to get redirects working inside a block. Seems to be
      # a scoping issue, since redirect returns a MethodMissing
      redirect(page.description.redirect_url(page, params))
  end
end