# Copyright (C) 2014 Vaidas Jablonskis
#
# Author: Vaidas Jablonskis <jablonskis@gmail.com>
#
# This file is part of cloud-init. See LICENSE file for license information.

import datetime
import httpretty
import json
import mock
import re

from base64 import b64encode, b64decode
from six.moves.urllib_parse import urlparse

from cloudinit import distros
from cloudinit import helpers
from cloudinit import settings
from cloudinit.sources import DataSourceGCE

from cloudinit.tests import helpers as test_helpers


GCE_META = {
    'instance/id': '123',
    'instance/zone': 'foo/bar',
    'instance/hostname': 'server.project-foo.local',
}

GCE_META_PARTIAL = {
    'instance/id': '1234',
    'instance/hostname': 'server.project-bar.local',
    'instance/zone': 'bar/baz',
}

GCE_META_ENCODING = {
    'instance/id': '12345',
    'instance/hostname': 'server.project-baz.local',
    'instance/zone': 'baz/bang',
    'instance/attributes': {
        'user-data': b64encode(b'#!/bin/echo baz\n').decode('utf-8'),
        'user-data-encoding': 'base64',
    }
}

GCE_USER_DATA_TEXT = {
    'instance/id': '12345',
    'instance/hostname': 'server.project-baz.local',
    'instance/zone': 'baz/bang',
    'instance/attributes': {
        'user-data': '#!/bin/sh\necho hi mom\ntouch /run/up-now\n',
    }
}

HEADERS = {'Metadata-Flavor': 'Google'}
MD_URL_RE = re.compile(
    r'http://metadata.google.internal/computeMetadata/v1/.*')


def _set_mock_metadata(gce_meta=None):
    if gce_meta is None:
        gce_meta = GCE_META

    def _request_callback(method, uri, headers):
        url_path = urlparse(uri).path
        if url_path.startswith('/computeMetadata/v1/'):
            path = url_path.split('/computeMetadata/v1/')[1:][0]
            recursive = path.endswith('/')
            path = path.rstrip('/')
        else:
            path = None
        if path in gce_meta:
            response = gce_meta.get(path)
            if recursive:
                response = json.dumps(response)
            return (200, headers, response)
        else:
            return (404, headers, '')

    # reset is needed. https://github.com/gabrielfalcao/HTTPretty/issues/316
    httpretty.register_uri(httpretty.GET, MD_URL_RE, body=_request_callback)


@httpretty.activate
class TestDataSourceGCE(test_helpers.HttprettyTestCase):

    def _make_distro(self, dtype, def_user=None):
        cfg = dict(settings.CFG_BUILTIN)
        cfg['system_info']['distro'] = dtype
        paths = helpers.Paths(cfg['system_info']['paths'])
        distro_cls = distros.fetch(dtype)
        if def_user:
            cfg['system_info']['default_user'] = def_user.copy()
        distro = distro_cls(dtype, cfg['system_info'], paths)
        return distro

    def setUp(self):
        tmp = self.tmp_dir()
        self.ds = DataSourceGCE.DataSourceGCE(
            settings.CFG_BUILTIN, None,
            helpers.Paths({'run_dir': tmp}))
        ppatch = self.m_platform_reports_gce = mock.patch(
            'cloudinit.sources.DataSourceGCE.platform_reports_gce')
        self.m_platform_reports_gce = ppatch.start()
        self.m_platform_reports_gce.return_value = True
        self.addCleanup(ppatch.stop)
        super(TestDataSourceGCE, self).setUp()

    def test_connection(self):
        _set_mock_metadata()
        success = self.ds.get_data()
        self.assertTrue(success)

        req_header = httpretty.last_request().headers
        self.assertDictContainsSubset(HEADERS, req_header)

    def test_metadata(self):
        # UnicodeDecodeError if set to ds.userdata instead of userdata_raw
        meta = GCE_META.copy()
        meta['instance/attributes/user-data'] = b'/bin/echo \xff\n'

        _set_mock_metadata()
        self.ds.get_data()

        shostname = GCE_META.get('instance/hostname').split('.')[0]
        self.assertEqual(shostname,
                         self.ds.get_hostname())

        self.assertEqual(GCE_META.get('instance/id'),
                         self.ds.get_instance_id())

        self.assertEqual(GCE_META.get('instance/attributes/user-data'),
                         self.ds.get_userdata_raw())

    # test partial metadata (missing user-data in particular)
    def test_metadata_partial(self):
        _set_mock_metadata(GCE_META_PARTIAL)
        self.ds.get_data()

        self.assertEqual(GCE_META_PARTIAL.get('instance/id'),
                         self.ds.get_instance_id())

        shostname = GCE_META_PARTIAL.get('instance/hostname').split('.')[0]
        self.assertEqual(shostname, self.ds.get_hostname())

    def test_userdata_no_encoding(self):
        """check that user-data is read."""
        _set_mock_metadata(GCE_USER_DATA_TEXT)
        self.ds.get_data()
        self.assertEqual(
            GCE_USER_DATA_TEXT['instance/attributes']['user-data'].encode(),
            self.ds.get_userdata_raw())

    def test_metadata_encoding(self):
        """user-data is base64 encoded if user-data-encoding is 'base64'."""
        _set_mock_metadata(GCE_META_ENCODING)
        self.ds.get_data()

        instance_data = GCE_META_ENCODING.get('instance/attributes')
        decoded = b64decode(instance_data.get('user-data'))
        self.assertEqual(decoded, self.ds.get_userdata_raw())

    def test_missing_required_keys_return_false(self):
        for required_key in ['instance/id', 'instance/zone',
                             'instance/hostname']:
            meta = GCE_META_PARTIAL.copy()
            del meta[required_key]
            _set_mock_metadata(meta)
            self.assertEqual(False, self.ds.get_data())
            httpretty.reset()

    def test_no_ssh_keys_metadata(self):
        _set_mock_metadata()
        self.ds.get_data()
        self.assertEqual([], self.ds.get_public_ssh_keys())

    def test_cloudinit_ssh_keys(self):
        valid_key = 'ssh-rsa VALID {0}'
        invalid_key = 'ssh-rsa INVALID {0}'
        project_attributes = {
            'sshKeys': '\n'.join([
                'cloudinit:{0}'.format(valid_key.format(0)),
                'user:{0}'.format(invalid_key.format(0)),
            ]),
            'ssh-keys': '\n'.join([
                'cloudinit:{0}'.format(valid_key.format(1)),
                'user:{0}'.format(invalid_key.format(1)),
            ]),
        }
        instance_attributes = {
            'ssh-keys': '\n'.join([
                'cloudinit:{0}'.format(valid_key.format(2)),
                'user:{0}'.format(invalid_key.format(2)),
            ]),
            'block-project-ssh-keys': 'False',
        }

        meta = GCE_META.copy()
        meta['project/attributes'] = project_attributes
        meta['instance/attributes'] = instance_attributes

        _set_mock_metadata(meta)
        self.ds.get_data()

        expected = [valid_key.format(key) for key in range(3)]
        self.assertEqual(set(expected), set(self.ds.get_public_ssh_keys()))

    @mock.patch("cloudinit.sources.DataSourceGCE.ug_util")
    def test_default_user_ssh_keys(self, mock_ug_util):
        mock_ug_util.normalize_users_groups.return_value = None, None
        mock_ug_util.extract_default.return_value = 'ubuntu', None
        ubuntu_ds = DataSourceGCE.DataSourceGCE(
            settings.CFG_BUILTIN, self._make_distro('ubuntu'),
            helpers.Paths({'run_dir': self.tmp_dir()}))

        valid_key = 'ssh-rsa VALID {0}'
        invalid_key = 'ssh-rsa INVALID {0}'
        project_attributes = {
            'sshKeys': '\n'.join([
                'ubuntu:{0}'.format(valid_key.format(0)),
                'user:{0}'.format(invalid_key.format(0)),
            ]),
            'ssh-keys': '\n'.join([
                'ubuntu:{0}'.format(valid_key.format(1)),
                'user:{0}'.format(invalid_key.format(1)),
            ]),
        }
        instance_attributes = {
            'ssh-keys': '\n'.join([
                'ubuntu:{0}'.format(valid_key.format(2)),
                'user:{0}'.format(invalid_key.format(2)),
            ]),
            'block-project-ssh-keys': 'False',
        }

        meta = GCE_META.copy()
        meta['project/attributes'] = project_attributes
        meta['instance/attributes'] = instance_attributes

        _set_mock_metadata(meta)
        ubuntu_ds.get_data()

        expected = [valid_key.format(key) for key in range(3)]
        self.assertEqual(set(expected), set(ubuntu_ds.get_public_ssh_keys()))

    def test_instance_ssh_keys_override(self):
        valid_key = 'ssh-rsa VALID {0}'
        invalid_key = 'ssh-rsa INVALID {0}'
        project_attributes = {
            'sshKeys': 'cloudinit:{0}'.format(invalid_key.format(0)),
            'ssh-keys': 'cloudinit:{0}'.format(invalid_key.format(1)),
        }
        instance_attributes = {
            'sshKeys': 'cloudinit:{0}'.format(valid_key.format(0)),
            'ssh-keys': 'cloudinit:{0}'.format(valid_key.format(1)),
            'block-project-ssh-keys': 'False',
        }

        meta = GCE_META.copy()
        meta['project/attributes'] = project_attributes
        meta['instance/attributes'] = instance_attributes

        _set_mock_metadata(meta)
        self.ds.get_data()

        expected = [valid_key.format(key) for key in range(2)]
        self.assertEqual(set(expected), set(self.ds.get_public_ssh_keys()))

    def test_block_project_ssh_keys_override(self):
        valid_key = 'ssh-rsa VALID {0}'
        invalid_key = 'ssh-rsa INVALID {0}'
        project_attributes = {
            'sshKeys': 'cloudinit:{0}'.format(invalid_key.format(0)),
            'ssh-keys': 'cloudinit:{0}'.format(invalid_key.format(1)),
        }
        instance_attributes = {
            'ssh-keys': 'cloudinit:{0}'.format(valid_key.format(0)),
            'block-project-ssh-keys': 'True',
        }

        meta = GCE_META.copy()
        meta['project/attributes'] = project_attributes
        meta['instance/attributes'] = instance_attributes

        _set_mock_metadata(meta)
        self.ds.get_data()

        expected = [valid_key.format(0)]
        self.assertEqual(set(expected), set(self.ds.get_public_ssh_keys()))

    def test_only_last_part_of_zone_used_for_availability_zone(self):
        _set_mock_metadata()
        r = self.ds.get_data()
        self.assertEqual(True, r)
        self.assertEqual('bar', self.ds.availability_zone)

    @mock.patch("cloudinit.sources.DataSourceGCE.GoogleMetadataFetcher")
    def test_get_data_returns_false_if_not_on_gce(self, m_fetcher):
        self.m_platform_reports_gce.return_value = False
        ret = self.ds.get_data()
        self.assertEqual(False, ret)
        m_fetcher.assert_not_called()

    def test_has_expired(self):

        def _get_timestamp(days):
            format_str = '%Y-%m-%dT%H:%M:%S+0000'
            today = datetime.datetime.now()
            timestamp = today + datetime.timedelta(days=days)
            return timestamp.strftime(format_str)

        past = _get_timestamp(-1)
        future = _get_timestamp(1)
        ssh_keys = {
            None: False,
            '': False,
            'Invalid': False,
            'user:ssh-rsa key user@domain.com': False,
            'user:ssh-rsa key google {"expireOn":"%s"}' % past: False,
            'user:ssh-rsa key google-ssh': False,
            'user:ssh-rsa key google-ssh {invalid:json}': False,
            'user:ssh-rsa key google-ssh {"userName":"user"}': False,
            'user:ssh-rsa key google-ssh {"expireOn":"invalid"}': False,
            'user:xyz key google-ssh {"expireOn":"%s"}' % future: False,
            'user:xyz key google-ssh {"expireOn":"%s"}' % past: True,
        }

        for key, expired in ssh_keys.items():
            self.assertEqual(DataSourceGCE._has_expired(key), expired)

    def test_parse_public_keys_non_ascii(self):
        public_key_data = [
            'cloudinit:rsa ssh-ke%s invalid' % chr(165),
            'use%sname:rsa ssh-key' % chr(174),
            'cloudinit:test 1',
            'default:test 2',
            'user:test 3',
        ]
        expected = ['test 1', 'test 2']
        found = DataSourceGCE._parse_public_keys(
            public_key_data, default_user='default')
        self.assertEqual(sorted(found), sorted(expected))

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