/usr/lib/python2.7/dist-packages/jwcrypto/common.py is in python-jwcrypto 0.2.1-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | # Copyright (C) 2015 JWCrypto Project Contributors - see LICENSE file
from base64 import urlsafe_b64encode, urlsafe_b64decode
import json
# Padding stripping versions as described in
# RFC 7515 Appendix C
def base64url_encode(payload):
if not isinstance(payload, bytes):
payload = payload.encode('utf-8')
encode = urlsafe_b64encode(payload)
return encode.decode('utf-8').rstrip('=')
def base64url_decode(payload):
l = len(payload) % 4
if l == 2:
payload += '=='
elif l == 3:
payload += '='
elif l != 0:
raise ValueError('Invalid base64 string')
return urlsafe_b64decode(payload.encode('utf-8'))
# JSON encoding/decoding helpers with good defaults
def json_encode(string):
if isinstance(string, bytes):
string = string.decode('utf-8')
return json.dumps(string, separators=(',', ':'))
def json_decode(string):
if isinstance(string, bytes):
string = string.decode('utf-8')
return json.loads(string)
class InvalidJWAAlgorithm(Exception):
def __init__(self, message=None):
msg = 'Invalid JWS Algorithm name'
if message:
msg += ' (%s)' % message
super(InvalidJWAAlgorithm, self).__init__(msg)
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