wangxiaojun1990 opened a new issue, #63803:
URL: https://github.com/apache/airflow/issues/63803
### Apache Airflow version
apache-airflow==3.1.8
apache-airflow-providers-fab==3.4.0
apache-airflow-providers-standard==1.12.0
### What happened
`POST /auth/token` always returns `500 Internal Server Error`.
The FAB auth manager calls `get_application_builder()` on every token
request, which initializes Flask-AppBuilder and calls `register_views()`.
During form initialization, `HookMetaService.MockOptional` **instances** are
passed as WTForms validators. Since `MockOptional` has no `__call__` method,
WTForms raises `TypeError`.
### Root Cause
`HookMetaService._get_hooks_with_mocked_fab()` patches
`wtforms.validators.Optional` with `MockOptional` class:
```python
with mock.patch("wtforms.validators.Optional", HookMetaService.MockOptional):
pm = ProvidersManager() # providers call Optional() → creates
MockOptional() instances
return pm.hooks, pm.connection_form_widgets, ...
```
After the `with` block exits, `MockOptional()` instances remain stored
inside provider form widget definitions. When FAB later initializes real
WTForms forms using those definitions, `check_validators` requires validators
to be callable — but `MockOptional` instances are not.
### Traceback
```
File "airflow/providers/fab/auth_manager/api_fastapi/routes/login.py", line
42, in create_token
with get_application_builder():
File "airflow/providers/fab/auth_manager/cli_commands/utils.py", line 69, in
get_application_builder
File "airflow/providers/fab/www/extensions/init_appbuilder.py", line 156, in
__init__
File "airflow/providers/fab/auth_manager/fab_auth_manager.py", line 624, in
register_views
File "airflow/providers/fab/auth_manager/security_manager/override.py", line
472, in register_views
File "flask_appbuilder/baseviews.py", line 904, in _init_forms
File "wtforms/fields/core.py", line 171, in check_validators
TypeError:
<airflow.api_fastapi.core_api.services.ui.connections.HookMetaService.MockOptional
object at 0x...>
is not a valid validator because it is not callable
```
### Expected behavior
`POST /auth/token` should return a valid JWT token.
### Suggested fix
Add `__call__` to `MockOptional` so it is usable as a WTForms validator:
```python
class MockOptional:
"""Mock for wtforms.validators.Optional."""
def __init__(self, *args, **kwargs):
pass
def __call__(self, form, field):
pass # no-op
```
### How to reproduce
1. Deploy Airflow 3.1.8 with `apache-airflow-providers-fab==3.4.0`
2. `POST http://<airflow-api-server>/auth/token` with valid credentials
3. Observe 500 Internal Server Error
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