# jwt/claims_time.py
from datetime import datetime, timedelta, timezone
from time import sleep, time

import jwt


iat = datetime.now(tz=timezone.utc)
nfb = iat + timedelta(seconds=1)
exp = iat + timedelta(seconds=3)


data = {'payload': 'data', 'nbf': nfb, 'exp': exp, 'iat': iat}


def decode(token, secret):
    print(time())
    try:
        print(jwt.decode(token, secret, algorithms=['HS256']))
    except (
        jwt.ImmatureSignatureError, jwt.ExpiredSignatureError
    ) as err:
        print(err)
        print(type(err))


secret = 'secret-key'
token = jwt.encode(data, secret)


decode(token, secret)
sleep(2)
decode(token, secret)
sleep(2)
decode(token, secret)


"""
$ python jwt/claims_time.py
1631043839.6459477
The token is not yet valid (nbf)
<class 'jwt.exceptions.ImmatureSignatureError'>
1631043841.6480813
{'payload': 'data', 'nbf': 1631043840, 'exp': 1631043842, 'iat':
1631043839}
1631043843.6498601
Signature has expired
<class 'jwt.exceptions.ExpiredSignatureError'>
"""