Merge pull request #16951 from edx/ahsan/LEARNER-3393-rate-limited-access-token-view

Rate limited /oauth2/access_token/

lms/djangoapps/oauth2_handler/tests.py

 # pylint: disable=missing-docstring
+import mock
 from django.core.cache import cache
 from django.test.utils import override_settings
 # Will also run default tests for IDTokens and UserInfo
@@ -134,6 +135,13 @@ class IDTokenTest(BaseTestMixin, IDTokenTestCase):
         _scopes, claims = self.get_id_token_values('openid profile permissions')
         self.assertTrue(claims['administrator'])
 
+    def test_rate_limit_token(self):
+        with mock.patch('openedx.core.djangoapps.oauth_dispatch.views.AccessTokenView.ratelimit_rate', '1/m'):
+            response = self.get_access_token_response('openid profile permissions')
+            self.assertEqual(response.status_code, 200)
+            response = self.get_access_token_response('openid profile permissions')
+            self.assertEqual(response.status_code, 403)
+
 
 class UserInfoTest(BaseTestMixin, UserInfoTestCase):
     def setUp(self):

lms/envs/common.py

@@ -3465,3 +3465,7 @@ EDX_PLATFORM_REVISION = 'unknown'
 # Once a user has watched this percentage of a video, mark it as complete:
 # (0.0 = 0%, 1.0 = 100%)
 COMPLETION_VIDEO_COMPLETE_PERCENTAGE = 0.95
+
+############### Settings for Django Rate limit #####################
+RATELIMIT_ENABLE = True
+RATELIMIT_RATE = '30/m'

openedx/core/djangoapps/oauth_dispatch/views.py

@@ -17,6 +17,8 @@ from edx_oauth2_provider import views as dop_views  # django-oauth2-provider vie
 from jwkest.jwk import RSAKey
 from oauth2_provider import models as dot_models  # django-oauth-toolkit
 from oauth2_provider import views as dot_views
+from ratelimit import ALL
+from ratelimit.mixins import RatelimitMixin
 
 from openedx.core.djangoapps.auth_exchange import views as auth_exchange_views
 from openedx.core.lib.token_utils import JwtBuilder
@@ -83,12 +85,16 @@ class _DispatchingView(View):
             return request.POST.get('client_id')
 
 
-class AccessTokenView(_DispatchingView):
+class AccessTokenView(RatelimitMixin, _DispatchingView):
     """
     Handle access token requests.
     """
     dot_view = dot_views.TokenView
     dop_view = dop_views.AccessTokenView
+    ratelimit_key = 'openedx.core.djangoapps.util.ratelimit.real_ip'
+    ratelimit_rate = settings.RATELIMIT_RATE
+    ratelimit_block = True
+    ratelimit_method = ALL
 
     def dispatch(self, request, *args, **kwargs):
         response = super(AccessTokenView, self).dispatch(request, *args, **kwargs)

openedx/core/djangoapps/util/ratelimit.py

+from ipware.ip import get_ip
+
+
+def real_ip(group, request):
+    return get_ip(request)

requirements/edx/base.txt

@@ -29,6 +29,7 @@ django-mptt>=0.8.6,<0.9
 django-oauth-toolkit==0.12.0
 django-pipeline-forgiving==1.0.0
 django-pyfs==2.0
+django-ratelimit==1.1.0
 django-sekizai>=0.10
 django-ses==0.8.4
 django-simple-history==1.9.0