Fix bug: AttributeError arises while sorting with standard attributes

Common neutron resource(e.g, Port) consists of:
1. Resource Attributes, e.g: Port.mac_address, etc.
2. Standard Attributes, e.g: created_at, and are shared among all
   neutron resources.
The `sort` opt only supports limited attributes. We need to filter
attributes that are defined with `is_sort_key=True` and it's preferred
to explicitly warn CLI & API users of illegal sort keys rather than
just accept without check, pass forward and then hit a internal error
which's quite confusing.

Depends-on: https://review.opendev.org/#/c/660097/
Change-Id: I8d206f909b09f1279dfcdc25c39989a67bff93d5
Closes-Bug: #1659175

neutron/api/api_common.py

@@ -233,7 +233,9 @@ def get_sorts(request, attr_info):
         msg = _("The number of sort_keys and sort_dirs must be same")
         raise exc.HTTPBadRequest(explanation=msg)
     valid_dirs = [constants.SORT_DIRECTION_ASC, constants.SORT_DIRECTION_DESC]
-    absent_keys = [x for x in sort_keys if x not in attr_info]
+    valid_sort_keys = set(attr for attr, schema in attr_info.items()
+                          if schema.get('is_sort_key', False))
+    absent_keys = [x for x in sort_keys if x not in valid_sort_keys]
     if absent_keys:
         msg = _("%s is invalid attribute for sort_keys") % absent_keys
         raise exc.HTTPBadRequest(explanation=msg)

neutron/tests/unit/api/v2/test_base.py

@@ -1562,7 +1562,10 @@ class SortingTestCase(base.BaseTestCase):
     def test_get_sorts(self):
         path = '/?sort_key=foo&sort_dir=desc&sort_key=bar&sort_dir=asc'
         request = webob.Request.blank(path)
-        attr_info = {'foo': {'key': 'val'}, 'bar': {'key': 'val'}}
+        attr_info = {
+            'foo': {'key': 'val', 'is_sort_key': True},
+            'bar': {'key': 'val', 'is_sort_key': True}
+        }
         expect_val = [('foo', False), ('bar', True)]
         actual_val = api_common.get_sorts(request, attr_info)
         self.assertEqual(expect_val, actual_val)
@@ -1570,11 +1573,23 @@ class SortingTestCase(base.BaseTestCase):
     def test_get_sorts_with_project_id(self):
         path = '/?sort_key=project_id&sort_dir=desc'
         request = webob.Request.blank(path)
-        attr_info = {'tenant_id': {'key': 'val'}}
+        attr_info = {'tenant_id': {'key': 'val', 'is_sort_key': True}}
         expect_val = [('project_id', False)]
         actual_val = api_common.get_sorts(request, attr_info)
         self.assertEqual(expect_val, actual_val)
 
+    def test_get_sorts_with_non_sort_key(self):
+        path = '/?sort_key=created_at&sort_dir=desc'
+        request = webob.Request.blank(path)
+        attr_info = {
+            'foo': {'key': 'val', 'is_sort_key': True},
+            'bar': {'key': 'val', 'is_sort_key': True},
+            'created_at': {'key': 'val'}
+        }
+        self.assertRaises(exc.HTTPBadRequest,
+                          api_common.get_sorts,
+                          request, attr_info)
+
 
 class FiltersTestCase(base.BaseTestCase):
     def test_all_skip_args(self):

releasenotes/notes/add-sort-keys-check-for-get-sorts-b9e3e86ddcb3bc3a.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Add sort-keys validation logic to method ``get_sorts`` in
+    ``neutron.api.api_common``. See the link below for more:
+    https://bugs.launchpad.net/neutron/+bug/1659175