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# Copyright (C) 2017 Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import jwt
JWT_SIGNING_ALGORITHM = 'RS512'
class TokenCache:
def __init__(self):
self._cache = {}
def parse(self, token, key, audience):
if token not in self._cache:
if len(self._cache) > 1024: # pragma: no cover
self._cache = {}
decoded = self._decode(token, key, audience)
self._cache[token] = decoded
return self._cache[token]
def _decode(self, token, key, audience):
return jwt.decode(
token,
key=key.exportKey('OpenSSH'),
audience=None, options={'verify_aud': False})
_cache = TokenCache()
def create_token(claims, signing_key):
return jwt.encode(
claims,
signing_key.exportKey('PEM'),
algorithm=JWT_SIGNING_ALGORITHM)
def decode_token(token, key, audience):
return _cache.parse(token, key, audience)
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