def create_token(self):
"""Create a time-stamped token"""
token = unicode(
hashlib.sha512(str(time.time()) + self.username).hexdigest())
DataToken.delete_by_username(self.username, self.action)
# create new one
token_instance = DataToken(token=token,
username=self.username,
action=self.action,
date=datetime.now() + self.expiration_delay)
return token_instance
