def test_bad_payload(self):
signer = signing.FernetSigner('predictable-key')
value = signer.sign('hello')
with self.assertRaises(signing.BadSignature):
# Break the version
signer.unsign(b' ' + value[1:])
with self.assertRaises(signing.BadSignature):
# Break the signature
signer.unsign(value[:-1] + b' ')
def test_fernet_signer(self):
value = b'hello'
with freeze_time(123456789):
signer = signing.FernetSigner('predictable-key')
ts = signer.sign(value)
self.assertEqual(signer.unsign(ts), value)
with freeze_time(123456800 + signing._MAX_CLOCK_SKEW):
self.assertEqual(signer.unsign(ts, ttl=12), value)
# max_age parameter can also accept a datetime.timedelta object
self.assertEqual(
signer.unsign(ts, ttl=datetime.timedelta(seconds=11)), value)
with self.assertRaises(signing.SignatureExpired):
signer.unsign(ts, ttl=10)
with freeze_time(123456778 - signing._MAX_CLOCK_SKEW):
with self.assertRaises(signing.SignatureExpired):
signer.unsign(ts, ttl=10)
def test_unsupported(self):
value = b'hello'
signer = signing.FernetSigner('predictable-key')
with self.assertRaises(signing.BadSignature):
signer.unsign(value)