Bad Request error when credential expires, requires manually deleting cached token.json file

[ForrestTrepte]

I was using gtasks-md with a personal Google account with oauth in testing mode as an external user. I believe tokens expire after 7 days.

At that point, I received the following error:

PS C:\Users\forre> gtasks-md view
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "c:\users\forre\.local\bin\gtasks-md.exe\__main__.py", line 7, in <module>
  File "C:\Users\forre\pipx\venvs\gtasks-md\Lib\site-packages\app\__main__.py", line 62, in main
    view(service)
  File "C:\Users\forre\pipx\venvs\gtasks-md\Lib\site-packages\app\__main__.py", line 141, in view
    _, text = fetch_task_lists(service)
              ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\forre\pipx\venvs\gtasks-md\Lib\site-packages\app\__main__.py", line 173, in fetch_task_lists
    task_lists = service.fetch_task_lists()
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\forre\pipx\venvs\gtasks-md\Lib\site-packages\app\googleapi.py", line 318, in fetch_task_lists
    task_lists = self.task_lists().list(maxResults=100).execute().get("items", [])
                 ^^^^^^^^^^^^^^^^^
  File "C:\Users\forre\pipx\venvs\gtasks-md\Lib\site-packages\app\googleapi.py", line 52, in task_lists
    return self._get_service().tasklists()
           ^^^^^^^^^^^^^^^^^^^
  File "C:\Users\forre\pipx\venvs\gtasks-md\Lib\site-packages\app\googleapi.py", line 389, in _get_service
    credentials=self.get_credentials(),
                ^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\forre\pipx\venvs\gtasks-md\Lib\site-packages\app\googleapi.py", line 365, in get_credentials
    creds.refresh(Request())
  File "C:\Users\forre\pipx\venvs\gtasks-md\Lib\site-packages\google\oauth2\credentials.py", line 409, in refresh
    ) = reauth.refresh_grant(
        ^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\forre\pipx\venvs\gtasks-md\Lib\site-packages\google\oauth2\reauth.py", line 366, in refresh_grant
    _client._handle_error_response(response_data, retryable_error)
  File "C:\Users\forre\pipx\venvs\gtasks-md\Lib\site-packages\google\oauth2\_client.py", line 69, in _handle_error_response
    raise exceptions.RefreshError(
google.auth.exceptions.RefreshError: ('invalid_grant: Bad Request', {'error': 'invalid_grant', 'error_description': 'Bad Request'})

It was challenging to recover from this problem. Running gtasks-md auth "C:\mycred.json" didn't fix the problem. Even after creating a brand new desktop credential and running gtasks-md auth "C:\mycred2.json" the problem persisted.

After manually deleting the cached token via del 'C:\Users\forre\.cache\gtasks-md\default\token.json', then I was able to run gtasks-md auth "C:\mycred2.json", and then my problem was solved.

I am reporting this here in case others have the same problem. Or perhaps there is a bug in the caching logic that it did not automatically get a new token after a token has expired or it that gtasks-md auth didn't clear the cache?

[ForrestTrepte]

@jupblb FYI, this seems like a bug.

This happened to me again when my token expired. Again, deleting the cached token.json fixed the problem.