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import os
import unittest
from argparse import Namespace

import pytest

from airflow.security import kerberos
from airflow.security.kerberos import renew_from_kt
from tests.test_utils.config import conf_vars

KRB5_KTNAME = os.environ.get('KRB5_KTNAME')


@unittest.skipIf(KRB5_KTNAME is None, 'Skipping Kerberos API tests due to missing KRB5_KTNAME')
class TestKerberos(unittest.TestCase):
    def setUp(self):
        self.args = Namespace(
            keytab=KRB5_KTNAME, principal=None, pid=None, daemon=None, stdout=None, stderr=None, log_file=None
        )

    @conf_vars({('kerberos', 'keytab'): KRB5_KTNAME})
    def test_renew_from_kt(self):
        """
        We expect no result, but a successful run. No more TypeError
        """
        assert renew_from_kt(principal=self.args.principal, keytab=self.args.keytab) is None

    @conf_vars({('kerberos', 'keytab'): ''})
    def test_args_from_cli(self):
        """
        We expect no result, but a run with sys.exit(1) because keytab not exist.
        """
        self.args.keytab = "test_keytab"

        with pytest.raises(SystemExit) as ctx:
            renew_from_kt(principal=self.args.principal, keytab=self.args.keytab)

            with self.assertLogs(kerberos.log) as log:
                assert (
                    'kinit: krb5_init_creds_set_keytab: Failed to find '
                    'airflow@LUPUS.GRIDDYNAMICS.NET in keytab FILE:{} '
                    '(unknown enctype)'.format(self.args.keytab) in log.output
                )

            assert ctx.value.code == 1