Error when creating refresh token: value too long for type character varying(255)

[hb-joel]

Describe the bug

When trying to create a new refresh token using OAuth2 in Django using custom token genretor , the application throws a django.db.utils.DataError: value too long for type character varying(255) error. This seems to be caused by attempting to insert a value that exceeds the column size in the database.

To Reproduce

1. Call the endpoint to issue a new token with an authorization code.
2. This should trigger the creation of a refresh token.
3. The error value too long for type character varying(255) is thrown.

Expected behavior

The refresh token should be created successfully without the database column size being a problem.

Version

• django-oauth-toolkit version: 3.0.1

• I have tested with the latest published release and it's still a problem.
• I have tested with the master branch and it's still a problem.

Additional context

• The error occurs specifically during the creation of a refresh token in the oauth2_provider/oauth2_validators.py file.
• It seems that the RefreshToken model might need its column size increased or additional validation added to ensure the token length fits the database constraints.