Fixed #16004 - csrf_protect does not send cookie if view returns TemplateResponse

The root bug was in decorator_from_middleware, and the fix also corrects
bugs with gzip_page and other decorators.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16276 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/utils/decorators.py

@@ -1,5 +1,7 @@
 from django.http import HttpResponse
 from django.middleware.doc import XViewMiddleware
+from django.template import Template, Context
+from django.template.response import TemplateResponse
 from django.test import TestCase, RequestFactory
 from django.utils.decorators import decorator_from_middleware
 
@@ -19,6 +21,26 @@ class ClassXView(object):
 class_xview = xview_dec(ClassXView())
 
 
+class FullMiddleware(object):
+    def process_request(self, request):
+        request.process_request_reached = True
+
+    def process_view(sef, request, view_func, view_args, view_kwargs):
+        request.process_view_reached = True
+
+    def process_template_response(self, request, response):
+        request.process_template_response_reached = True
+        return response
+
+    def process_response(self, request, response):
+        # This should never receive unrendered content.
+        request.process_response_content = response.content
+        request.process_response_reached = True
+        return response
+
+full_dec = decorator_from_middleware(FullMiddleware)
+
+
 class DecoratorFromMiddlewareTests(TestCase):
     """
     Tests for view decorators created using
@@ -37,3 +59,48 @@ class DecoratorFromMiddlewareTests(TestCase):
         Test a middleware that implements process_view, operating on a callable class.
         """
         class_xview(self.rf.get('/'))
+
+    def test_full_dec_normal(self):
+        """
+        Test that all methods of middleware are called for normal HttpResponses
+        """
+
+        @full_dec
+        def normal_view(request):
+            t = Template("Hello world")
+            return HttpResponse(t.render(Context({})))
+
+        request = self.rf.get('/')
+        response = normal_view(request)
+        self.assertTrue(getattr(request, 'process_request_reached', False))
+        self.assertTrue(getattr(request, 'process_view_reached', False))
+        # process_template_response must not be called for HttpResponse
+        self.assertFalse(getattr(request, 'process_template_response_reached', False))
+        self.assertTrue(getattr(request, 'process_response_reached', False))
+
+    def test_full_dec_templateresponse(self):
+        """
+        Test that all methods of middleware are called for TemplateResponses in
+        the right sequence.
+        """
+
+        @full_dec
+        def template_response_view(request):
+            t = Template("Hello world")
+            return TemplateResponse(request, t, {})
+
+        request = self.rf.get('/')
+        response = template_response_view(request)
+        self.assertTrue(getattr(request, 'process_request_reached', False))
+        self.assertTrue(getattr(request, 'process_view_reached', False))
+        self.assertTrue(getattr(request, 'process_template_response_reached', False))
+        # response must not be rendered yet.
+        self.assertFalse(response._is_rendered)
+        # process_response must not be called until after response is rendered,
+        # otherwise some decorators like csrf_protect and gzip_page will not
+        # work correctly. See #16004
+        self.assertFalse(getattr(request, 'process_response_reached', False))
+        response.render()
+        self.assertTrue(getattr(request, 'process_response_reached', False))
+        # Check that process_response saw the rendered content
+        self.assertEqual(request.process_response_content, "Hello world")