Exemplo de uso de decorators na vida real utilizando views no django

tests.py

import fudge
from django.test import TestCase
from django.contrib.auth.models import User
from django.http import Http404
import views

def stub(name = 'stub'):
    return fudge.Fake(name).is_a_stub()

class AuthTest(TestCase):
    def setUp(self):
        self.user = User()
        self.user.username = 'root'
        self.user.set_password('123')
        self.user.is_staff = True
        self.user.is_superuser = True
        self.user.save()

    def test_auth_should_not_pass_through_when_user_is_inside_local_network(self):
        request = stub('request')
        request.REMOTE_ADDR = '10.0.0.1'
        self.assertFalse(views.user_should_pass(request))

    def test_auth_should_pass_through_when_user_is_inside_local_network(self):
        request = stub('request')
        request.REMOTE_ADDR = '192.168.0.1'
        self.assertTrue(views.user_should_pass(request))

    def test_user_should_pass_to_index_page_if_it_is_inside_the_network(self):
        request = stub('request')
        request.REMOTE_ADDR = '192.168.0.1'
        views.root_login = stub().is_callable()
        try:
            views.index(request)
        except Http404:
            self.fail('User deveria passar')

    def test_user_should_not_pass_to_index_page_if_it_isnt_inside_the_network(self):
        request = stub('request')
        request.REMOTE_ADDR = '10.0.0.1'
        request.session = []
        views.root_login = stub().is_callable()
        try:
            views.index(request)
            self.fail('User nao deveria passar')
        except Http404:
            pass

views.py

from django.http import Http404, HttpResponse
from django.contrib.auth.models import User
from django.contrib.auth import login 

def user_should_pass(request):
    return request.REMOTE_ADDR.startswith('192.168.0')

def pass_if_it_is_inside_network(the_view):
    def decorated(request, *args, **kwargs):
        if user_should_pass(request):
            root_login(request)
            return the_view(request)
        else:
            raise Http404
    return decorated

def root_login(request):
    user = User.objects.filter(username = 'root')[0]
    login(request, user)

@pass_if_it_is_inside_network
def index(request):
    return HttpResponse('You are in! Welcome root!')