chiuinggum commented on code in PR #57199:
URL: https://github.com/apache/airflow/pull/57199#discussion_r2462407726


##########
providers/fab/src/airflow/providers/fab/auth_manager/api_fastapi/services/roles.py:
##########
@@ -0,0 +1,80 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, cast
+
+from starlette import status
+from starlette.exceptions import HTTPException
+
+from airflow.api_fastapi.app import get_auth_manager
+from airflow.providers.fab.auth_manager.api_fastapi.datamodels.roles import 
RoleIn, RoleOut
+
+if TYPE_CHECKING:
+    from airflow.providers.fab.auth_manager.fab_auth_manager import 
FabAuthManager
+    from airflow.providers.fab.auth_manager.security_manager.override import 
FabAirflowSecurityManagerOverride
+
+
+class FABAuthManagerRoles:
+    """Service layer for FAB Auth Manager role operations (create, validate, 
sync)."""
+
+    @staticmethod
+    def _check_action_and_resource(
+        sm: FabAirflowSecurityManagerOverride,
+        perms: list[tuple[str, str]],
+    ) -> None:
+        for action_name, resource_name in perms:
+            if not sm.get_action(action_name):
+                raise HTTPException(
+                    status_code=status.HTTP_400_BAD_REQUEST,
+                    detail=f"The specified action: {action_name!r} was not 
found",
+                )
+            if not sm.get_resource(resource_name):
+                raise HTTPException(
+                    status_code=status.HTTP_400_BAD_REQUEST,
+                    detail=f"The specified resource: {resource_name!r} was not 
found",
+                )
+
+    @classmethod
+    def create_role(cls, body: RoleIn) -> RoleOut:
+        if not body or not body.name:
+            raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, 
detail="Role name must be provided")

Review Comment:
   @vincbeck 
   [Legacy 
behavior](https://github.com/apache/airflow/blob/main/providers/fab/src/airflow/providers/fab/auth_manager/api_endpoints/role_and_permission_endpoint.py#L161-L166)
 returned `400 Bad Request` for invalid/empty bodies. Since we can let Pydantic 
handle this automatically, I’m switching to Pydantic validation so empty 
strings are rejected with `422 Unprocessable Entity`. Concretely:
   ```diff
   class RoleBody(StrictBaseModel):
   -    name: str
   +    name: str = Field(min_length=1)
   ```
   This means a request with `name=""` will fail validation and FastAPI will 
return 422:
   ```json
   {
       "detail": [
           {
               "type": "string_too_short",
               "loc": [
                   "body",
                   "name"
               ],
               "msg": "String should have at least 1 character",
               "input": "",
               "ctx": {
                   "min_length": 1
               }
           }
       ]
   }
   ```
   I proceed with 422 in the latest commit. Thanks!



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