Flask RESTful Destroy Custom Token

Question

I configure the Flask-RESTful service and authenticate the user. The method I use:

def generate_auth_token(username, expiration=600):
    gen_serial = Serializer(secret_key, expires_in=expiration)
    return gen_serial.dumps({'username': username})

I pass the token to the user as follows:

class token(Resource):
    decorators = [auth.login_required]
    def post(self):
        username = g.user
        return_token = generate_auth_token(username)
        return {'token':return_token.decode()}, 200

And the token is then checked as such, so it does not need to be stored on the server side:

def verify_auth_token(auth_token):
    serial = Serializer(secret_key)
    try:
        data = serial.loads(auth_token)
    except SignatureExpired:
        return None 
    except BadSignature:
        return None 
    serial_user = data['username']
    return serial_user

This seems to work well, however, I don’t know how to log out before expiration without saving the token server. My idea was to return the garbage token when the user decided to log out, but I do not think this is an elegant or safe solution.

Any tips really will be helpful!

Answer 1

:

def generate_auth_token(username=None, expiration=600):
    gen_serial = Serializer(secret_key, expires_in=expiration)
    data = {'username': username} if username is not None else {}
    return gen_serial.dumps(data)

invalidate, :

def invalidate(self):
    return_token = generate_auth_token()
    return {'token':return_token.decode()}, 200

:

def verify_auth_token(auth_token):
    serial = Serializer(secret_key)
    try:
        data = serial.loads(auth_token)
    except SignatureExpired:
        return None 
    except BadSignature:
        return None 
    serial_user = data.get('username')
    return serial_user