def generate_sign_token(string, secret_key=None, salt=None, sep=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)
signed_string = signer.sign(string).decode()
ts = signer.get_timestamp()
return signed_string, ts
