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1"""
2<Program Name>
3 exceptions.py
5<Author>
6 Santiago Torres-Arias <santiago@nyu.edu>
7 Lukas Puehringer <lukas.puehringer@nyu.edu>
9<Started>
10 Dec 8, 2017
12<Copyright>
13 See LICENSE for licensing information.
15<Purpose>
16 Define Exceptions used in the gpg package. Following the practice from
17 securesystemslib the names chosen for exception classes should end in
18 'Error' (except where there is a good reason not to).
20"""
22import datetime
25class PacketParsingError(Exception):
26 pass
29class KeyNotFoundError(Exception):
30 pass
33class PacketVersionNotSupportedError(Exception):
34 pass
37class SignatureAlgorithmNotSupportedError(Exception):
38 pass
41class KeyExpirationError(Exception):
42 def __init__(self, key):
43 super().__init__()
44 self.key = key
46 def __str__(self):
47 creation_time = datetime.datetime.utcfromtimestamp(self.key["creation_time"])
48 expiration_time = datetime.datetime.utcfromtimestamp(
49 self.key["creation_time"] + self.key["validity_period"]
50 )
51 validity_period = expiration_time - creation_time
53 return (
54 "GPG key '{}' created on '{:%Y-%m-%d %H:%M} UTC' with validity "
55 "period '{}' expired on '{:%Y-%m-%d %H:%M} UTC'.".format(
56 self.key["keyid"],
57 creation_time,
58 validity_period,
59 expiration_time,
60 )
61 )