Using GET parameters in /o/token/ endpoint causes http 500 error (instead of 400)#1209
Description
Describe the bug
When GET parameters are in /o/token/, e.g. /o/token/?test=test , the server returns 500 error.
This is caused because OAuth2Error (with status code 400) from oauthlib is not caught:
https://github.com/oauthlib/oauthlib/blob/a70e13ff19d74f7fc1e397742782c7b881e2d496/oauthlib/oauth2/rfc6749/endpoints/base.py#L88
I think the solution is to change this:
https://github.com/jazzband/django-oauth-toolkit/blob/9d2aac2480b2a1875eb52612661992f73606bade/oauth2_provider/oauth2_backends.py#L155
to something like this:
https://github.com/jazzband/django-oauth-toolkit/blob/9d2aac2480b2a1875eb52612661992f73606bade/oauth2_provider/oauth2_backends.py#L184
To Reproduce
Add any GET paremeters to /o/token endpoint
Expected behavior
Server returns 400 error
Additional context
We are migrating from very old version of this library where RFC6749 was not enforced by oauthlib. We would like to send proper error when the request is invalid.