add expiry date to TimestampSigner about itsdangerous HOT 2 CLOSED

>>> import time
>>> import datetime
>>> import itsdangerous

>>> # calculate my expiry time
>>> expiry_time = datetime.datetime.utcnow() + datetime.timedelta(minutes=5)

>>> # generate code and include my expiry time
>>> serializer = itsdangerous.URLSafeTimedSerializer('password', salt='soup')
>>> code = serializer.dumps('sharingcode', moment=expiry_time)

>>> # generated code
>>> code
'InNoYXJpbmdjb2RlIg.B1h0cQ.essqAawsTQl9WbxlK4Kzb3c3CAE'

>>> # wait a minute
>>> time.sleep(60)

>>> # value for reference
>>> serializer.loads(code, max_age=0)
u'sharingcode'

>>> # wait another 4 minutes (+1 second)
>>> time.sleep(241)

>>> # try it again, define max_age=0
>>> serializer.loads(code, max_age=0)
Traceback (most recent call last):
  File "<ipython-input-18-83b1842ba2eb>", line 1, in <module>
    serializer.loads(code, max_age=0)
  File "itsdangerous.py", line 667, in loads
    .unsign(s, max_age, return_timestamp=True)
  File "itsdangerous.py", line 470, in unsign
    date_signed=self.timestamp_to_datetime(timestamp))
SignatureExpired: Signature age 1 > 0 seconds