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# Copyright 2021 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS-IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# [START python-jwt-sign-example]
"""A utility for creating and signing JSON Web Tokens (JWT).
It loads cleartext keys from disk - this is not recommended!
"""
import datetime
from absl import app
from absl import flags
from absl import logging
import tink
from tink import cleartext_keyset_handle
from tink import jwt
_PRIVATE_KEYSET_PATH = flags.DEFINE_string(
'private_keyset_path', None,
'Path to the keyset used for the JWT signature operation.')
_AUDIENCE = flags.DEFINE_string('audience', None,
'Audience to be used in the token')
_TOKEN_PATH = flags.DEFINE_string('token_path', None, 'Path to the token file.')
def main(argv):
del argv # Unused.
# Initialise Tink
jwt.register_jwt_signature()
# Read the keyset into a KeysetHandle
with open(_PRIVATE_KEYSET_PATH.value, 'rt') as keyset_file:
try:
text = keyset_file.read()
keyset_handle = cleartext_keyset_handle.read(tink.JsonKeysetReader(text))
except tink.TinkError as e:
logging.exception('Error reading keyset: %s', e)
return 1
now = datetime.datetime.now(tz=datetime.timezone.utc)
# Get the JwtPublicKeySign primitive
try:
jwt_sign = keyset_handle.primitive(jwt.JwtPublicKeySign)
except tink.TinkError as e:
logging.exception('Error creating JwtPublicKeySign: %s', e)
return 1
# Create token
raw_jwt = jwt.new_raw_jwt(
audiences=[_AUDIENCE.value],
expiration=now + datetime.timedelta(seconds=100))
token = jwt_sign.sign_and_encode(raw_jwt)
with open(_TOKEN_PATH.value, 'wt') as token_file:
token_file.write(token)
logging.info('Token has been written to %s', _TOKEN_PATH.value)
if __name__ == '__main__':
flags.mark_flags_as_required(
['private_keyset_path', 'audience', 'token_path'])
app.run(main)
# [END python-jwt-sign-example]