ch09

ch09/jwt/claims_time.py

@@ -0,0 +1,49 @@
+# 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'>
+"""