config.ru

# coding: utf-8

require "rango"

Rango.boot

# warden authentication
# wiki.github.com/hassox/warden/setup
require "warden"

Project.import("views.rb")
use Warden::Manager do |manager|
  manager.default_strategies :password
  # Rango::Controller has class method call which will call Rango::Controller.reroute(action),
  # for example Login.route_to(:login) which will set login action of Login controller as default
  # Internally it just rewrites env["rango.controller"] and env["rango.action"] to "Login", resp. "login"
  manager.failure_app = Twitter
end

Warden::Manager.serialize_into_session { |user| user.id }
Warden::Manager.serialize_from_session { |key| User.get(id) }

# Go to login
Warden::Manager.before_failure do |env, opts|
  Twitter.route_to env, 'login'
end

Warden::Strategies.add(:password) do
  def authenticate!
    User.new # just for test
  end
end

run Rango.app

console.log

[00:59:05] params: {}
[00:59:05] cookies: {:__utma=>"111872281.2820358207102789000.1240239502.1240239502.1240239502.1", :__utmz=>"111872281.1240239502.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none)", :referer=>"/"}
[00:59:05] session: {}
[00:59:05] Calling filter authenticate for controller #<Twitter:0x133ca88>
[00:59:05] params: {}
[00:59:05] cookies: {:__utma=>"111872281.2820358207102789000.1240239502.1240239502.1240239502.1", :__utmz=>"111872281.1240239502.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none)", :referer=>"/"}
[00:59:05] session: {}
[00:59:05] Calling filter authenticate for controller #<Twitter:0x133b7f0>
ArgumentError: uncaught throw :warden
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/warden-0.2.1/lib/warden/proxy.rb:72:in `throw'
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/warden-0.2.1/lib/warden/proxy.rb:72:in `authenticate!'
	/Users/botanicus/Projects/rango/examples/twitter/views.rb:11:in `authenticate'
	/Users/botanicus/Projects/rango/rango/lib/rango/mvc/controller.rb:117:in `block in run_filters'
	/Users/botanicus/Projects/rango/rango/lib/rango/mvc/controller.rb:112:in `each'
	/Users/botanicus/Projects/rango/rango/lib/rango/mvc/controller.rb:112:in `run_filters'
	/Users/botanicus/Projects/rango/rango/lib/rango/mvc/controller.rb:52:in `call'
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/warden-0.2.1/lib/warden/manager.rb:131:in `call_failure_app'
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/warden-0.2.1/lib/warden/manager.rb:117:in `process_unauthenticated'
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/warden-0.2.1/lib/warden/manager.rb:54:in `call'
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/rack-1.0.0/lib/rack/lint.rb:47:in `_call'
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/rack-1.0.0/lib/rack/lint.rb:35:in `call'
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/rack-1.0.0/lib/rack/showexceptions.rb:24:in `call'
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/rack-1.0.0/lib/rack/commonlogger.rb:20:in `_call'
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/rack-1.0.0/lib/rack/commonlogger.rb:13:in `call'
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/rack-1.0.0/lib/rack/content_length.rb:13:in `call'
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/rack-1.0.0/lib/rack/chunked.rb:15:in `call'
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/thin-1.2.2/lib/thin/connection.rb:76:in `block in pre_process'
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/thin-1.2.2/lib/thin/connection.rb:74:in `catch'
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/thin-1.2.2/lib/thin/connection.rb:74:in `pre_process'
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/thin-1.2.2/lib/thin/connection.rb:57:in `process'
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/thin-1.2.2/lib/thin/connection.rb:42:in `receive_data'
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/eventmachine-0.12.6/lib/eventmachine.rb:240:in `run_machine'
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/eventmachine-0.12.6/lib/eventmachine.rb:240:in `run'
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/thin-1.2.2/lib/thin/backends/base.rb:57:in `start'
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/thin-1.2.2/lib/thin/server.rb:156:in `start'
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/rack-1.0.0/lib/rack/handler/thin.rb:14:in `run'
	/opt/pkg/ruby-1.9.1/lib/ruby1.9/gems/1.9.1/gems/rack-1.0.0/bin/rackup:176:in `<top (required)>'
	/opt/pkg/ruby-1.9.1/bin/rackup:19:in `load'
	/opt/pkg/ruby-1.9.1/bin/rackup:19:in `<main>'
127.0.0.1 - - [03/Jun/2009 00:59:05] "GET /unauthenticated HTTP/1.1" 500 94027 0.1222

views.rb

# coding: utf-8

Rango.import("mvc/controller")
Project.import("models")

class Twitter < Rango::Controller
  before :authenticate

  def authenticate
    request.env['warden'].authenticate!
  end
  
  def login
    "Please log in."
  end
  
  def index
    render "index"
  end
  
  def timeline
    @posts = Post.all
    display @posts, "list.html"
  end
  
  def show(id)
    @post = Post.get(id)
    raise Error404.new(params) unless @post
    display @post, "show.html"
  end
end