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__all__ = [
    'KubernetesAuthTestCaseMixin'
]

import os
import base64

from libcloud.utils.py3 import b

from libcloud.common.kubernetes import KubernetesBasicAuthConnection
from libcloud.common.kubernetes import KubernetesTLSAuthConnection
from libcloud.common.kubernetes import KubernetesTokenAuthConnection

KEY_FILE = os.path.abspath(os.path.join(os.path.dirname(__file__),
                           '../compute/fixtures/azure/libcloud.pem'))
CERT_FILE = os.path.abspath(os.path.join(os.path.dirname(__file__),
                            '../loadbalancer/fixtures/nttcis/denis.crt'))
CA_CERT_FILE = os.path.abspath(os.path.join(os.path.dirname(__file__),
                               '../loadbalancer/fixtures/nttcis/chain.crt'))


class KubernetesAuthTestCaseMixin(object):
    """
    Test class mixin which tests different type of Kubernetes authentication
    mechanisms (client cert, token, basic auth).

    It's to be used with all the drivers which inherit from KubernetesDriverMixin.
    """

    def test_http_basic_auth(self):
        driver = self.driver_cls(key='username', secret='password')
        self.assertEqual(driver.connectionCls, KubernetesBasicAuthConnection)
        self.assertEqual(driver.connection.user_id, 'username')
        self.assertEqual(driver.connection.key, 'password')

        auth_string = base64.b64encode(b('%s:%s' % ('username', 'password'))).decode('utf-8')

        headers = driver.connection.add_default_headers({})
        self.assertEqual(headers['Content-Type'], 'application/json')
        self.assertEqual(headers['Authorization'], 'Basic %s' % (auth_string))

    def test_cert_auth(self):
        # key_file provided, but not cert_file
        expected_msg = 'Both key and certificate files are needed'
        self.assertRaisesRegex(ValueError, expected_msg, self.driver_cls,
                               key_file=KEY_FILE, ca_cert=CA_CERT_FILE)

        # cert_file provided, but not key_file
        expected_msg = 'Both key and certificate files are needed'
        self.assertRaisesRegex(ValueError, expected_msg, self.driver_cls,
                               cert_file=CERT_FILE, ca_cert=CA_CERT_FILE)

        # ca_cert argument specified
        driver = self.driver_cls(key_file=KEY_FILE, cert_file=CERT_FILE,
                                 ca_cert=CA_CERT_FILE)
        self.assertEqual(driver.connectionCls, KubernetesTLSAuthConnection)
        self.assertEqual(driver.connection.key_file, KEY_FILE)
        self.assertEqual(driver.connection.cert_file, CERT_FILE)
        self.assertEqual(driver.connection.connection.ca_cert, CA_CERT_FILE)

        headers = driver.connection.add_default_headers({})
        self.assertEqual(headers['Content-Type'], 'application/json')

        # ca_cert argument not specified
        driver = self.driver_cls(key_file=KEY_FILE, cert_file=CERT_FILE,
                                 ca_cert=None)
        self.assertEqual(driver.connectionCls, KubernetesTLSAuthConnection)
        self.assertEqual(driver.connection.key_file, KEY_FILE)
        self.assertEqual(driver.connection.cert_file, CERT_FILE)
        self.assertEqual(driver.connection.connection.ca_cert, False)

        headers = driver.connection.add_default_headers({})
        self.assertEqual(headers['Content-Type'], 'application/json')

    def test_bearer_token_auth(self):
        driver = self.driver_cls(ex_token_bearer_auth=True, key='foobar')
        self.assertEqual(driver.connectionCls, KubernetesTokenAuthConnection)
        self.assertEqual(driver.connection.key, 'foobar')

        headers = driver.connection.add_default_headers({})
        self.assertEqual(headers['Content-Type'], 'application/json')
        self.assertEqual(headers['Authorization'], 'Bearer %s' % ('foobar'))

    def test_host_sanitization(self):
        driver = self.driver_cls(host='example.com')
        self.assertEqual(driver.connection.host, 'example.com')

        driver = self.driver_cls(host='http://example.com')
        self.assertEqual(driver.connection.host, 'example.com')

        driver = self.driver_cls(host='https://example.com')
        self.assertEqual(driver.connection.host, 'example.com')