def create(cls, username, auth_id, **kwargs):
    #def create(cls, username, auth_id, profile_url, profile_image_url, **kwargs):
        """Creates a new user and returns it. If the username already exists,
        returns None.

        :param username:
            Unique username.
        :param auth_id:
            Authentication id, according the the authentication method used.
        :param kwargs:
            Additional entity attributes.
        :returns:
            The newly created user or None if the username already exists.
        """
        kwargs['username'] = username
        kwargs['key_name'] = username
        
        now = datetime.datetime.now()
        kwargs['access_token_expires'] = now + datetime.timedelta(seconds=int(kwargs['expires_seconds']))        
        
        #kwargs['profile_url'] = profile_url
        #kwargs['profile_image_url'] = profile_image_url
        kwargs['domain'] = auth_id.split('|')[0]

        kwargs['auth_id'] = auth_id
        # Generate an initial session id.
        kwargs['session_id'] = gen_salt(length=32)
        kwargs['friend_ids'] = []


        if 'password_hash' in kwargs:
            # Password is already hashed.
            kwargs['password'] = kwargs.pop('password_hash')
        elif 'password' in kwargs:
            # Password is not hashed: generate a hash.
            kwargs['password'] = gen_pwhash(kwargs['password'])
        config = Config.get_for_current_environment()

        def txn():
            if cls.get_by_username(username) is not None:
                # Username already exists.
                return None

            user = cls(**kwargs)
            character = Character.create(config=config, user=user, image_url=user.profile_image_url, is_fake=False)
            user.character = character
            db.put((user, character))
            
            return user

        return db.run_in_transaction(txn)
 def get_game_config(self):
     return Config.get_for_current_environment()