venv/lib/python3.11/site-packages/authlib/integrations/flask_oauth2/signals.py

from flask.signals import Namespace

_signal = Namespace()

#: signal when client is authenticated
client_authenticated = _signal.signal('client_authenticated')

#: signal when token is revoked
token_revoked = _signal.signal('token_revoked')

#: signal when token is authenticated
token_authenticated = _signal.signal('token_authenticated')