#!/usr/bin/env python3
#
# Copyright (C) 2021-2025 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import base64
import argparse

parser = argparse.ArgumentParser(description="Validate base64 input.")
parser.add_argument("base64", help="Base64 encoded string to validate")
parser.add_argument("--decoded-len", type=int, help="Optional list of valid lengths for the decoded input")
args = parser.parse_args()

try:
    decoded = base64.b64decode(args.base64)
    if args.decoded_len and len(decoded) != args.decoded_len:
        exit(1)
except:
    exit(1)
exit(0)