Fixed #17449 -- Added OPTIONS to generic views.

Thanks estebistec for the report and patch.

django/views/generic/base.py

@@ -79,14 +79,22 @@ class View(object):
         return handler(request, *args, **kwargs)
 
     def http_method_not_allowed(self, request, *args, **kwargs):
-        allowed_methods = [m for m in self.http_method_names if hasattr(self, m)]
         logger.warning('Method Not Allowed (%s): %s', request.method, request.path,
             extra={
                 'status_code': 405,
                 'request': self.request
             }
         )
-        return http.HttpResponseNotAllowed(allowed_methods)
+        return http.HttpResponseNotAllowed(self._allowed_methods())
+
+    def options(self, request, *args, **kwargs):
+        response = http.HttpResponse()
+        response['Allow'] = ', '.join(self._allowed_methods())
+        response['Content-Length'] = 0
+        return response
+
+    def _allowed_methods(self):
+        return [m.upper() for m in self.http_method_names if hasattr(self, m)]
 
 
 class TemplateResponseMixin(object):

tests/regressiontests/generic_views/base.py

@@ -173,6 +173,58 @@ class ViewTest(unittest.TestCase):
         """
         self.assertTrue(DecoratedDispatchView.as_view().is_decorated)
 
+    def test_head_no_get(self):
+        """
+        Test that a view class with no get responds to a HEAD request with HTTP
+        405.
+        """
+        request = self.rf.head('/')
+        view = PostOnlyView.as_view()
+        self.assertEqual(405, view(request).status_code)
+
+    def test_options(self):
+        """
+        Test that views respond to HTTP OPTIONS requests with an Allow header
+        appropriate for the methods implemented by the view class.
+        """
+        request = self.rf.options('/')
+        view = SimpleView.as_view()
+        response = view(request)
+        self.assertEqual(200, response.status_code)
+        self.assertTrue(response['Allow'])
+
+    def test_options_for_get_view(self):
+        """
+        Test that a view implementing GET allows GET and HEAD.
+        """
+        request = self.rf.options('/')
+        view = SimpleView.as_view()
+        response = view(request)
+        self._assert_allows(response, 'GET', 'HEAD')
+
+    def test_options_for_get_and_post_view(self):
+        """
+        Test that a view implementing GET and POST allows GET, HEAD, and POST.
+        """
+        request = self.rf.options('/')
+        view = SimplePostView.as_view()
+        response = view(request)
+        self._assert_allows(response, 'GET', 'HEAD', 'POST')
+
+    def test_options_for_post_view(self):
+        """
+        Test that a view implementing POST allows POST.
+        """
+        request = self.rf.options('/')
+        view = PostOnlyView.as_view()
+        response = view(request)
+        self._assert_allows(response, 'POST')
+
+    def _assert_allows(self, response, *expected_methods):
+        "Assert allowed HTTP methods reported in the Allow response header"
+        response_allows = set(response['Allow'].split(', '))
+        self.assertEqual(set(expected_methods + ('OPTIONS',)), response_allows)
+
 
 class TemplateViewTest(TestCase):
     urls = 'regressiontests.generic_views.urls'