def validate_sign_token(string,
secret_key=None,
salt=None,
sep=None,
max_age=None):
if not salt:
salt = constants["SALT_KEY"]
if not sep:
sep = constants["SEP_KEY"]
if not secret_key:
secret_key = constants["SECRET_KEY"]
signer = TimestampSigner(secret_key, salt=salt, sep=sep)
return signer.validate(string.encode(), max_age=max_age)
