Fix OPTIONS request to REST API methods

cvat/apps/engine/views.py

@@ -260,7 +260,7 @@ class ProjectViewSet(viewsets.ModelViewSet):
     ordering_fields = filter_fields
     ordering = "-id"
     lookup_fields = {'owner': 'owner__username', 'assignee': 'assignee__username'}
-    http_method_names = ('get', 'post', 'head', 'patch', 'delete')
+    http_method_names = ('get', 'post', 'head', 'patch', 'delete', 'options')
     iam_organization_field = 'organization'
 
     def get_serializer_class(self):
@@ -1243,7 +1243,7 @@ def perform_create(self, serializer):
 class UserViewSet(viewsets.GenericViewSet, mixins.ListModelMixin,
     mixins.RetrieveModelMixin, mixins.UpdateModelMixin, mixins.DestroyModelMixin):
     queryset = User.objects.prefetch_related('groups').all()
-    http_method_names = ['get', 'post', 'head', 'patch', 'delete']
+    http_method_names = ['get', 'post', 'head', 'patch', 'delete', 'options']
     search_fields = ('username', 'first_name', 'last_name')
     iam_organization_field = 'memberships__organization'
 
@@ -1313,7 +1313,7 @@ def self(self, request):
         '201': CloudStorageWriteSerializer,
     }, tags=['cloud storages'], versions=['2.0']))
 class CloudStorageViewSet(viewsets.ModelViewSet):
-    http_method_names = ['get', 'post', 'patch', 'delete']
+    http_method_names = ['get', 'post', 'patch', 'delete', 'options']
     queryset = CloudStorageModel.objects.all().prefetch_related('data')
 
     search_fields = ('provider_type', 'display_name', 'resource',

cvat/apps/iam/permissions.py

@@ -1015,8 +1015,14 @@ class PolicyEnforcer(BasePermission):
     # pylint: disable=no-self-use
     def check_permission(self, request, view, obj):
         permissions = []
-        for perm in OpenPolicyAgentPermission.__subclasses__():
-            permissions.extend(perm.create(request, view, obj))
+        # DRF can send OPTIONS request. Internally it will try to get
+        # information about serializers for PUT and POST requests (clone
+        # request and replace the http method). To avoid handling
+        # ('POST', 'metadata') and ('PUT', 'metadata') in every request,
+        # the condition below is enough.
+        if not self.is_metadata_request(request, view):
+            for perm in OpenPolicyAgentPermission.__subclasses__():
+                permissions.extend(perm.create(request, view, obj))
 
         return all(permissions)
 
@@ -1029,6 +1035,10 @@ def has_permission(self, request, view):
     def has_object_permission(self, request, view, obj):
         return self.check_permission(request, view, obj)
 
+    @staticmethod
+    def is_metadata_request(request, view):
+        return request.method == 'OPTIONS' or view.action == 'metadata'
+
 class IsMemberInOrganization(BasePermission):
     message = 'You should be an active member in the organization.'
 

tests/rest_api/test_organizations.py

@@ -4,9 +4,35 @@
 
 from http import HTTPStatus
 import pytest
-from .utils.config import get_method, patch_method, delete_method
+from .utils.config import get_method, options_method, patch_method, delete_method
 from deepdiff import DeepDiff
 
+class TestMetadataOrganizations:
+    _ORG = 2
+
+    @pytest.mark.parametrize('privilege, role, is_member', [
+        ('admin',    None,         None),
+        ('user',     None,         False),
+        ('business', None,         False),
+        ('worker',   None,         False),
+        (None,       'owner',      True),
+        (None,       'maintainer', True),
+        (None,       'worker',     True),
+        (None,       'supervisor', True),
+    ])
+    def test_can_send_options_request(self, privilege, role, is_member,
+            find_users, organizations):
+        exclude_org = None if is_member else self._ORG
+        org = self._ORG if is_member else None
+        user = find_users(privilege=privilege, role=role, org=org,
+            exclude_org=exclude_org)[0]['username']
+
+        response = options_method(user, f'organizations')
+        assert response.status_code == HTTPStatus.OK
+
+        response = options_method(user, f'organizations/{self._ORG}')
+        assert response.status_code == HTTPStatus.OK
+
 class TestGetOrganizations:
     _ORG = 2
 

tests/rest_api/utils/config.py

@@ -24,6 +24,9 @@ def get_api_url(endpoint, **kwargs):
 def get_method(username, endpoint, **kwargs):
     return requests.get(get_api_url(endpoint, **kwargs), auth=(username, USER_PASS))
 
+def options_method(username, endpoint, **kwargs):
+    return requests.options(get_api_url(endpoint, **kwargs), auth=(username, USER_PASS))
+
 def delete_method(username, endpoint, **kwargs):
     return requests.delete(get_api_url(endpoint, **kwargs), auth=(username, USER_PASS))