#!/usr/bin/python
#

# Copyright (C) 2010 Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
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#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
# IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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"""Tool to detect expired X509 certificates.

"""

# pylint: disable=C0103
# C0103: Invalid name check-cert-expired

import os.path
import sys
import OpenSSL

from ganeti import constants
from ganeti import cli
from ganeti import utils


def main():
  """Main routine.

  """
  program = os.path.basename(sys.argv[0])

  if len(sys.argv) != 2:
    cli.ToStderr("Usage: %s <certificate-path>", program)
    sys.exit(constants.EXIT_FAILURE)

  filename = sys.argv[1]

  # Read certificate
  try:
    cert_pem = utils.ReadFile(filename)
  except EnvironmentError, err:
    cli.ToStderr("Unable to read %s: %s", filename, err)
    sys.exit(constants.EXIT_FAILURE)

  # Check validity
  try:
    cert = OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM,
                                           cert_pem)

    (errcode, msg) = utils.VerifyX509Certificate(cert, None, None)
    if msg:
      cli.ToStderr("%s: %s", filename, msg)
    if errcode == utils.CERT_ERROR:
      sys.exit(constants.EXIT_SUCCESS)

  except (KeyboardInterrupt, SystemExit):
    raise
  except Exception, err: # pylint: disable=W0703
    cli.ToStderr("Unable to check %s: %s", filename, err)

  sys.exit(constants.EXIT_FAILURE)


if __name__ == "__main__":
  main()