blueprints: fixed bug causing filtering with an empty query (#4106)

* Fixed bug causing filtering with an empty query

Fixed bug allowing blueprint import to filter for existing models using an empty query.

The code only checks if the `identifiers` dict is empty, but `__query_from_identifier` skips identifier member values of type `dict` or keys == `pk`, so it is possible to produce an empty query if an `identifier` consists of just `dict` type members or "pk" key. 

Signed-off-by: sdimovv <36302090+sdimovv@users.noreply.github.com>

* Added test case

* Added support for using dict fields as blueprint entry identifiers

* Disabled pylint too-many-locals for _validate_single

Signed-off-by: sdimovv <36302090+sdimovv@users.noreply.github.com>

authentik/blueprints/tests/test_v1.py

@@ -27,6 +27,61 @@ class TestBlueprintsV1(TransactionTestCase):
             )
         )
         self.assertFalse(importer.validate()[0])
+        importer = Importer(
+            (
+                '{"version": 1, "entries": [{"attrs": {"name": "test"}, '
+                '"identifiers": {}, '
+                '"model": "authentik_core.Group"}]}'
+            )
+        )
+        self.assertFalse(importer.validate()[0])
+
+    def test_validated_import_dict_identifiers(self):
+        """Test importing blueprints with dict identifiers."""
+        Group.objects.filter(name__istartswith="test").delete()
+
+        Group.objects.create(
+            name="test1",
+            attributes={
+                "key": ["value"],
+                "other_key": ["a_value", "other_value"],
+            },
+        )
+        Group.objects.create(
+            name="test2",
+            attributes={
+                "key": ["value"],
+                "other_key": ["diff_value", "other_diff_value"],
+            },
+        )
+
+        importer = Importer(
+            (
+                '{"version": 1, "entries": [{"attrs": {"name": "test999", "attributes": '
+                '{"key": ["updated_value"]}}, "identifiers": {"attributes": {"other_key": '
+                '["other_value"]}}, "model": "authentik_core.Group"}]}'
+            )
+        )
+        self.assertTrue(importer.validate()[0])
+        self.assertTrue(importer.apply())
+        self.assertTrue(
+            Group.objects.filter(
+                name="test2",
+                attributes={
+                    "key": ["value"],
+                    "other_key": ["diff_value", "other_diff_value"],
+                },
+            )
+        )
+        self.assertTrue(
+            Group.objects.filter(
+                name="test999",
+                # All attributes used as identifiers are kept and merged with the
+                # new attributes declared in the blueprint
+                attributes={"key": ["updated_value"], "other_key": ["other_value"]},
+            )
+        )
+        self.assertFalse(Group.objects.filter(name="test1"))
 
     def test_export_validate_import(self):
         """Test export and validate it"""

authentik/blueprints/v1/importer.py

@@ -132,13 +132,16 @@ class Importer:
             main_query = Q(pk=attrs["pk"])
         sub_query = Q()
         for identifier, value in attrs.items():
-            if isinstance(value, dict):
-                continue
             if identifier == "pk":
                 continue
+            if isinstance(value, dict):
+                sub_query &= Q(**{f"{identifier}__contains": value})
+            else:
                 sub_query &= Q(**{identifier: value})
+
         return main_query | sub_query
 
+    # pylint: disable-msg=too-many-locals
     def _validate_single(self, entry: BlueprintEntry) -> Optional[BaseSerializer]:
         """Validate a single entry"""
         model_app_label, model_name = entry.model.split(".")
@@ -156,8 +159,6 @@ class Importer:
                     f"Serializer errors {serializer.errors}", serializer_errors=serializer.errors
                 ) from exc
             return serializer
-        if entry.identifiers == {}:
-            raise EntryInvalidError("No identifiers")
 
         # If we try to validate without referencing a possible instance
         # we'll get a duplicate error, hence we load the model here and return
@@ -169,7 +170,12 @@ class Importer:
             if isinstance(value, dict) and "pk" in value:
                 del updated_identifiers[key]
                 updated_identifiers[f"{key}"] = value["pk"]
-        existing_models = model.objects.filter(self.__query_from_identifier(updated_identifiers))
+
+        query = self.__query_from_identifier(updated_identifiers)
+        if not query:
+            raise EntryInvalidError("No or invalid identifiers")
+
+        existing_models = model.objects.filter(query)
 
         serializer_kwargs = {}
         model_instance = existing_models.first()
@@ -198,7 +204,7 @@ class Importer:
             full_data = self.__update_pks_for_attrs(entry.get_attrs(self.__import))
         except ValueError as exc:
             raise EntryInvalidError(exc) from exc
-        full_data.update(updated_identifiers)
+        always_merger.merge(full_data, updated_identifiers)
         serializer_kwargs["data"] = full_data
 
         serializer: Serializer = model().serializer(**serializer_kwargs)