require 'action_dispatch/middleware/stack' module ActionController # Extend ActionDispatch middleware stack to make it aware of options # allowing the following syntax in controllers: # # class PostsController < ApplicationController # use AuthenticationMiddleware, :except => [:index, :show] # end # class MiddlewareStack < ActionDispatch::MiddlewareStack #:nodoc: class Middleware < ActionDispatch::MiddlewareStack::Middleware #:nodoc: def initialize(klass, *args, &block) options = args.extract_options! @only = Array(options.delete(:only)).map(&:to_s) @except = Array(options.delete(:except)).map(&:to_s) args << options unless options.empty? super end def valid?(action) if @only.present? @only.include?(action) elsif @except.present? !@except.include?(action) else true end end end def build(action, app=nil, &block) app ||= block action = action.to_s raise "MiddlewareStack#build requires an app" unless app middlewares.reverse.inject(app) do |a, middleware| middleware.valid?(action) ? middleware.build(a) : a end end end # ActionController::Metal is the simplest possible controller, providing a # valid Rack interface without the additional niceties provided by # ActionController::Base. # # A sample metal controller might look like this: # # class HelloController < ActionController::Metal # def index # self.response_body = "Hello World!" # end # end # # And then to route requests to your metal controller, you would add # something like this to config/routes.rb: # # match 'hello', :to => HelloController.action(:index) # # The +action+ method returns a valid Rack application for the \Rails # router to dispatch to. # # == Rendering Helpers # # ActionController::Metal by default provides no utilities for rendering # views, partials, or other responses aside from explicitly calling of # response_body=, content_type=, and status=. To # add the render helpers you're used to having in a normal controller, you # can do the following: # # class HelloController < ActionController::Metal # include ActionController::Rendering # append_view_path "#{Rails.root}/app/views" # # def index # render "hello/index" # end # end # # == Redirection Helpers # # To add redirection helpers to your metal controller, do the following: # # class HelloController < ActionController::Metal # include ActionController::Redirecting # include Rails.application.routes.url_helpers # # def index # redirect_to root_url # end # end # # == Other Helpers # # You can refer to the modules included in ActionController::Base to see # other features you can bring into your metal controller. # class Metal < AbstractController::Base abstract! attr_internal_writer :env def env @_env ||= {} end # Returns the last part of the controller's name, underscored, without the ending # Controller. For instance, PostsController returns posts. # Namespaces are left out, so Admin::PostsController returns posts as well. # # ==== Returns # * string def self.controller_name @controller_name ||= name.demodulize.sub(/Controller$/, '').underscore end # Delegates to the class' controller_name def controller_name self.class.controller_name end # The details below can be overridden to support a specific # Request and Response object. The default ActionController::Base # implementation includes RackDelegation, which makes a request # and response object available. You might wish to control the # environment and response manually for performance reasons. attr_internal :headers, :response, :request delegate :session, :to => "@_request" def initialize @_headers = {"Content-Type" => "text/html"} @_status = 200 @_request = nil @_response = nil @_routes = nil super end def params @_params ||= request.parameters end def params=(val) @_params = val end # Basic implementations for content_type=, location=, and headers are # provided to reduce the dependency on the RackDelegation module # in Renderer and Redirector. def content_type=(type) headers["Content-Type"] = type.to_s end def content_type headers["Content-Type"] end def location headers["Location"] end def location=(url) headers["Location"] = url end # basic url_for that can be overridden for more robust functionality def url_for(string) string end def status @_status end def status=(status) @_status = Rack::Utils.status_code(status) end def response_body=(body) body = [body] unless body.nil? || body.respond_to?(:each) super end def performed? response_body || (response && response.committed?) end def dispatch(name, request) #:nodoc: @_request = request @_env = request.env @_env['action_controller.instance'] = self process(name) to_a end def to_a #:nodoc: response ? response.to_a : [status, headers, response_body] end class_attribute :middleware_stack self.middleware_stack = ActionController::MiddlewareStack.new def self.inherited(base) # :nodoc: base.middleware_stack = middleware_stack.dup super end # Pushes the given Rack middleware and its arguments to the bottom of the # middleware stack. def self.use(*args, &block) middleware_stack.use(*args, &block) end # Alias for +middleware_stack+. def self.middleware middleware_stack end # Makes the controller a Rack endpoint that runs the action in the given # +env+'s +action_dispatch.request.path_parameters+ key. def self.call(env) action(env['action_dispatch.request.path_parameters'][:action]).call(env) end # Returns a Rack endpoint for the given action name. def self.action(name, klass = ActionDispatch::Request) middleware_stack.build(name.to_s) do |env| new.dispatch(name, klass.new(env)) end end end end