Add merb-auth like router helper

lib/devise/rails/routes.rb

@@ -106,6 +106,16 @@ module ActionDispatch::Routing
       end
     end
 
+    def authenticate(scope)
+      constraint = lambda do |request|
+        request.env["warden"].authenticate!(:scope => scope)
+      end
+
+      constraints(constraint) do
+        yield
+      end
+    end
+
     protected
 
       def devise_session(mapping, controllers)

test/integration/database_authenticatable_test.rb

@@ -54,6 +54,34 @@ class DatabaseAuthenticationSanityTest < ActionController::IntegrationTest
     assert_not warden.authenticated?(:admin)
   end
 
+  test 'not signed in as admin should not be able to access private route restricted to admins' do
+    get private_path
+
+    assert_redirected_to new_admin_session_path
+    assert_not warden.authenticated?(:admin)
+  end
+
+  test 'signed in as user should not be able to access private route restricted to admins' do
+    sign_in_as_user
+    assert warden.authenticated?(:user)
+    assert_not warden.authenticated?(:admin)
+
+    get private_path
+    assert_redirected_to new_admin_session_path
+  end
+
+  test 'signed in as admin should be able to access private route restricted to admins' do
+    sign_in_as_admin
+    assert warden.authenticated?(:admin)
+    assert_not warden.authenticated?(:user)
+
+    get private_path
+
+    assert_response :success
+    assert_template 'home/private'
+    assert_contain 'Private!'
+  end
+
   test 'signed in as user should not be able to access admins actions' do
     sign_in_as_user
     assert warden.authenticated?(:user)

test/rails_app/app/controllers/home_controller.rb

@@ -1,4 +1,7 @@
 class HomeController < ApplicationController
   def index
   end
+
+  def private
+  end
 end

test/rails_app/app/views/home/private.html.erb

@@ -0,0 +1 @@
+Private!

test/rails_app/config/routes.rb

@@ -22,4 +22,8 @@ Rails::Application.routes.draw do
   match "/anywhere", :to => "foo#bar", :as => :new_admin_password
 
   root :to => "home#index"
+
+  authenticate(:admin) do
+    match "/private", :to => "home#private", :as => :private
+  end
 end