"assert exc_value is e" assertion error

[rayrapetyan]

Hi. I'm getting a following exception:

Traceback (most recent call last):
  File "/ara/venv_python/flask/lib/python2.7/site-packages/flask/app.py", line 1617, in full_dispatch_request
    rv = self.dispatch_request()
  File "/ara/venv_python/flask/lib/python2.7/site-packages/flask/app.py", line 1603, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/ara/venv_python/flask/lib/python2.7/site-packages/flask_restful/__init__.py", line 480, in wrapper
    resp = resource(*args, **kwargs)
  File "/ara/venv_python/flask/lib/python2.7/site-packages/flask/views.py", line 84, in view
    return self.dispatch_request(*args, **kwargs)
  File "/ara/venv_python/flask/lib/python2.7/site-packages/flask_restful/__init__.py", line 595, in dispatch_request
    resp = meth(*args, **kwargs)
  File "/ara/venv_python/flask/lib/python2.7/site-packages/flask_jwt_extended/view_decorators.py", line 33, in wrapper
    jwt_data = _decode_jwt_from_request(request_type='access')
  File "/ara/venv_python/flask/lib/python2.7/site-packages/flask_jwt_extended/view_decorators.py", line 194, in _decode_jwt_from_request
    decoded_token = _decode_jwt_from_headers()
  File "/ara/venv_python/flask/lib/python2.7/site-packages/flask_jwt_extended/view_decorators.py", line 156, in _decode_jwt_from_headers
    return decode_token(encoded_token)
  File "/ara/venv_python/flask/lib/python2.7/site-packages/flask_jwt_extended/utils.py", line 77, in decode_token
    csrf_value=csrf_value
  File "/ara/venv_python/flask/lib/python2.7/site-packages/flask_jwt_extended/tokens.py", line 106, in decode_jwt
    data = jwt.decode(encoded_token, secret, algorithms=[algorithm])
  File "/ara/venv_python/flask/lib/python2.7/site-packages/jwt/api_jwt.py", line 64, in decode
    options, **kwargs)
  File "/ara/venv_python/flask/lib/python2.7/site-packages/jwt/api_jws.py", line 116, in decode
    key, algorithms)
  File "/ara/venv_python/flask/lib/python2.7/site-packages/jwt/api_jws.py", line 186, in _verify_signature
    raise DecodeError('Signature verification failed')
DecodeError: Signature verification failed

It's being intercepted in flask/app.py later, in handle_user_exception function, and fails on:
assert exc_value is e

I've logged e and exc_value, they are:
"Signature verification failed"
and
"'DecodeError' object has no attribute 'code'"

respectively.

Please help to find a workaround! I've tried:

@app.errorhandler(JWTDecodeError)
def handle_jwt_decode_error(e):
    return {'message': str(e)}, 403

found in issue #86 with no success...

[vimalloc]

iirc flask-restful was a fork of flask-restplus or vice-versa, so I'm guessing whatever bug is screwing things up in the flask-restplus library is also breaking things here. If it is the same bug, there isn't anything I can do about it, as it is a problem with their extension breaking native flask functionality and nothing wrong with this extension (#86 has all the details for that).

If you can provide me with a minimum working example, I could dig into it a little deeper and see if it is in fact the same issue.

[rayrapetyan]

Sorry, please disregard this issue. It was an error in my custom errors handler which assumed DecodeError has a 'code' attribute which it hasn't:

class CustomRestfulApi(Api):
    def handle_error(self, e):        
        if (type(e).__name__ == 'ApiError' and e.code == 100):
            return self.make_response({'error': {'code': e.code, 'message': e.message}}, 403)
        if type(e).__name__ in ['DecodeError', 'NoAuthorizationError']:
            return self.make_response({'error': {'code': e.code, 'message': type(e).__name__}}, 403)

However there was no way to rewind stack to this place in any sort of Flask back-traces and logs (exceptions are evil after all), found accidentally when building a minimal working example for you. Thank you anyway!