Fix request body/POST access (#5590)

* Modernize middleware tests

* Added a failing test for #5582

* Set data ref on underlying django request

rest_framework/request.py

@@ -250,9 +250,10 @@ class Request(object):
             else:
                 self._full_data = self._data
 
-            # copy files refs to the underlying request so that closable
+            # copy data & files refs to the underlying request so that closable
             # objects are handled appropriately.
-            self._request._files = self._files
+            self._request._post = self.POST
+            self._request._files = self.FILES
 
     def _load_stream(self):
         """

tests/test_middleware.py

@@ -1,34 +1,76 @@
 from django.conf.urls import url
 from django.contrib.auth.models import User
+from django.http import HttpRequest
 from django.test import override_settings
 
 from rest_framework.authentication import TokenAuthentication
 from rest_framework.authtoken.models import Token
+from rest_framework.request import is_form_media_type
+from rest_framework.response import Response
 from rest_framework.test import APITestCase
 from rest_framework.views import APIView
 
+
+class PostView(APIView):
+    def post(self, request):
+        return Response(data=request.data, status=200)
+
+
 urlpatterns = [
-    url(r'^$', APIView.as_view(authentication_classes=(TokenAuthentication,))),
+    url(r'^auth$', APIView.as_view(authentication_classes=(TokenAuthentication,))),
+    url(r'^post$', PostView.as_view()),
 ]
 
 
-class MyMiddleware(object):
+class RequestUserMiddleware(object):
+    def __init__(self, get_response):
+        self.get_response = get_response
 
-    def process_response(self, request, response):
+    def __call__(self, request):
+        response = self.get_response(request)
         assert hasattr(request, 'user'), '`user` is not set on request'
-        assert request.user.is_authenticated(), '`user` is not authenticated'
+        assert request.user.is_authenticated, '`user` is not authenticated'
+
+        return response
+
+
+class RequestPOSTMiddleware(object):
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request):
+        assert isinstance(request, HttpRequest)
+
+        # Parse body with underlying Django request
+        request.body
+
+        # Process request with DRF view
+        response = self.get_response(request)
+
+        # Ensure request.POST is set as appropriate
+        if is_form_media_type(request.content_type):
+            assert request.POST == {'foo': ['bar']}
+        else:
+            assert request.POST == {}
+
         return response
 
 
 @override_settings(ROOT_URLCONF='tests.test_middleware')
 class TestMiddleware(APITestCase):
+
+    @override_settings(MIDDLEWARE=('tests.test_middleware.RequestUserMiddleware',))
     def test_middleware_can_access_user_when_processing_response(self):
         user = User.objects.create_user('john', 'john@example.com', 'password')
         key = 'abcd1234'
         Token.objects.create(key=key, user=user)
 
-        with self.settings(
-            MIDDLEWARE_CLASSES=('tests.test_middleware.MyMiddleware',)
-        ):
-            auth = 'Token ' + key
-            self.client.get('/', HTTP_AUTHORIZATION=auth)
+        self.client.get('/auth', HTTP_AUTHORIZATION='Token %s' % key)
+
+    @override_settings(MIDDLEWARE=('tests.test_middleware.RequestPOSTMiddleware',))
+    def test_middleware_can_access_request_post_when_processing_response(self):
+        response = self.client.post('/post', {'foo': 'bar'})
+        assert response.status_code == 200
+
+        response = self.client.post('/post', {'foo': 'bar'}, format='json')
+        assert response.status_code == 200