# Copyright 2012 OpenStack Foundation
# All Rights Reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.
import functools
import json
import logging
from unittest import mock
import uuid

import fixtures
import io
from keystoneauth1 import session
from keystoneauth1 import token_endpoint
from oslo_utils import encodeutils
import requests
from requests_mock.contrib import fixture
from urllib import parse
from testscenarios import load_tests_apply_scenarios as load_tests  # noqa
import testtools
from testtools import matchers
import types

import glanceclient
from glanceclient.common import http
from glanceclient.tests import utils


def original_only(f):
    @functools.wraps(f)
    def wrapper(self, *args, **kwargs):
        if not hasattr(self.client, 'log_curl_request'):
            self.skipTest('Skip logging tests for session client')

        return f(self, *args, **kwargs)
    return wrapper


class TestClient(testtools.TestCase):

    scenarios = [
        ('httpclient', {'create_client': '_create_http_client'}),
        ('session', {'create_client': '_create_session_client'})
    ]

    def _create_http_client(self):
        return http.HTTPClient(self.endpoint, token=self.token)

    def _create_session_client(self):
        auth = token_endpoint.Token(self.endpoint, self.token)
        sess = session.Session(auth=auth)
        return http.SessionClient(sess)

    def setUp(self):
        super(TestClient, self).setUp()
        self.mock = self.useFixture(fixture.Fixture())

        self.endpoint = 'http://example.com:9292'
        self.ssl_endpoint = 'https://example.com:9292'
        self.token = 'abc123'

        self.client = getattr(self, self.create_client)()

    def test_identity_headers_and_token(self):
        identity_headers = {
            'X-Auth-Token': 'auth_token',
            'X-User-Id': 'user',
            'X-Tenant-Id': 'tenant',
            'X-Roles': 'roles',
            'X-Identity-Status': 'Confirmed',
            'X-Service-Catalog': 'service_catalog',
        }
        # with token
        kwargs = {'token': 'fake-token',
                  'identity_headers': identity_headers}
        http_client_object = http.HTTPClient(self.endpoint, **kwargs)
        self.assertEqual('auth_token', http_client_object.auth_token)
        self.assertTrue(http_client_object.identity_headers.
                        get('X-Auth-Token') is None)

    def test_identity_headers_and_no_token_in_header(self):
        identity_headers = {
            'X-User-Id': 'user',
            'X-Tenant-Id': 'tenant',
            'X-Roles': 'roles',
            'X-Identity-Status': 'Confirmed',
            'X-Service-Catalog': 'service_catalog',
        }
        # without X-Auth-Token in identity headers
        kwargs = {'token': 'fake-token',
                  'identity_headers': identity_headers}
        http_client_object = http.HTTPClient(self.endpoint, **kwargs)
        self.assertEqual('fake-token', http_client_object.auth_token)
        self.assertTrue(http_client_object.identity_headers.
                        get('X-Auth-Token') is None)

    def test_identity_headers_and_no_token_in_session_header(self):
        # Tests that if token or X-Auth-Token are not provided in the kwargs
        # when creating the http client, the session headers don't contain
        # the X-Auth-Token key.
        identity_headers = {
            'X-User-Id': 'user',
            'X-Tenant-Id': 'tenant',
            'X-Roles': 'roles',
            'X-Identity-Status': 'Confirmed',
            'X-Service-Catalog': 'service_catalog',
        }
        kwargs = {'identity_headers': identity_headers}
        http_client_object = http.HTTPClient(self.endpoint, **kwargs)
        self.assertIsNone(http_client_object.auth_token)
        self.assertNotIn('X-Auth-Token', http_client_object.session.headers)

    def test_identity_headers_are_passed(self):
        # Tests that if token or X-Auth-Token are not provided in the kwargs
        # when creating the http client, the session headers don't contain
        # the X-Auth-Token key.
        identity_headers = {
            'X-User-Id': b'user',
            'X-Tenant-Id': b'tenant',
            'X-Roles': b'roles',
            'X-Identity-Status': b'Confirmed',
            'X-Service-Catalog': b'service_catalog',
        }
        kwargs = {'identity_headers': identity_headers}
        http_client = http.HTTPClient(self.endpoint, **kwargs)

        path = '/v1/images/my-image'
        self.mock.get(self.endpoint + path)
        http_client.get(path)

        headers = self.mock.last_request.headers
        for k, v in identity_headers.items():
            self.assertEqual(v, headers[k])

    def test_language_header_passed(self):
        kwargs = {'language_header': 'nb_NO'}
        http_client = http.HTTPClient(self.endpoint, **kwargs)

        path = '/v2/images/my-image'
        self.mock.get(self.endpoint + path)
        http_client.get(path)

        headers = self.mock.last_request.headers
        self.assertEqual(kwargs['language_header'], headers['Accept-Language'])

    def test_request_id_header_passed(self):
        global_id = encodeutils.safe_encode("req-%s" % uuid.uuid4())
        kwargs = {'global_request_id': global_id}
        http_client = http.HTTPClient(self.endpoint, **kwargs)

        path = '/v2/images/my-image'
        self.mock.get(self.endpoint + path)
        http_client.get(path)

        headers = self.mock.last_request.headers
        self.assertEqual(global_id, headers['X-OpenStack-Request-ID'])

    def test_language_header_not_passed_no_language(self):
        kwargs = {}
        http_client = http.HTTPClient(self.endpoint, **kwargs)

        path = '/v2/images/my-image'
        self.mock.get(self.endpoint + path)
        http_client.get(path)

        headers = self.mock.last_request.headers
        self.assertNotIn('Accept-Language', headers)

    def test_connection_timeout(self):
        """Verify a InvalidEndpoint is received if connection times out."""
        def cb(request, context):
            raise requests.exceptions.Timeout

        path = '/v1/images'
        self.mock.get(self.endpoint + path, text=cb)
        comm_err = self.assertRaises(glanceclient.exc.InvalidEndpoint,
                                     self.client.get,
                                     '/v1/images')
        self.assertIn(self.endpoint, comm_err.message)

    def test_connection_refused(self):
        """Verify a CommunicationError is received if connection is refused.

        The error should list the host and port that refused the connection.
        """
        def cb(request, context):
            raise requests.exceptions.ConnectionError()

        path = '/v1/images/detail?limit=20'
        self.mock.get(self.endpoint + path, text=cb)

        comm_err = self.assertRaises(glanceclient.exc.CommunicationError,
                                     self.client.get,
                                     '/v1/images/detail?limit=20')

        self.assertIn(self.endpoint, comm_err.message)

    def test_http_encoding(self):
        path = '/v1/images/detail'
        text = 'Ok'
        self.mock.get(self.endpoint + path, text=text,
                      headers={"Content-Type": "text/plain"})

        headers = {"test": 'ni\xf1o'}
        resp, body = self.client.get(path, headers=headers)
        self.assertEqual(text, resp.text)

    def test_headers_encoding(self):
        value = 'ni\xf1o'
        fake_location = b'http://web_server:80/images/fake.img'
        headers = {"test": value,
                   "none-val": None,
                   "Name": "value",
                   "x-image-meta-location": fake_location}
        encoded = http.encode_headers(headers)
        # Bug #1766235: According to RFC 8187, headers must be
        # encoded as 7-bit ASCII, so expect to see only displayable
        # chars in percent-encoding
        self.assertEqual(b"ni%C3%B1o", encoded[b"test"])
        self.assertNotIn("none-val", encoded)
        self.assertNotIn(b"none-val", encoded)
        self.assertEqual(b"value", encoded[b"Name"])
        # Bug #1788942: Colons in URL should not get percent-encoded
        self.assertEqual(fake_location, encoded[b"x-image-meta-location"])

    @mock.patch('keystoneauth1.adapter.Adapter.request')
    def test_http_duplicate_content_type_headers(self, mock_ksarq):
        """Test proper handling of Content-Type headers.

        encode_headers() must be called as late as possible before a
        request is sent. If this principle is violated, and if any
        changes are made to the headers between encode_headers() and the
        actual request (for instance a call to
        _set_common_request_kwargs()), and if you're trying to set a
        Content-Type that is not equal to application/octet-stream (the
        default), it is entirely possible that you'll end up with two
        Content-Type headers defined (yours plus
        application/octet-stream). The request will go out the door with
        only one of them chosen seemingly at random.

        This situation only occurs in python3. This test will never fail
        in python2.
        """
        path = "/v2/images/my-image"
        headers = {
            "Content-Type": "application/openstack-images-v2.1-json-patch"
        }
        data = '[{"value": "qcow2", "path": "/disk_format", "op": "replace"}]'
        self.mock.patch(self.endpoint + path)
        sess_http_client = self._create_session_client()
        sess_http_client.patch(path, headers=headers, data=data)
        # Pull out the headers with which Adapter.request was invoked
        ksarqh = mock_ksarq.call_args[1]['headers']
        # Only one Content-Type header (of any text-type)
        self.assertEqual(1, [encodeutils.safe_decode(key)
                             for key in ksarqh.keys()].count('Content-Type'))
        # And it's the one we set
        self.assertEqual(b"application/openstack-images-v2.1-json-patch",
                         ksarqh[b"Content-Type"])

    def test_request_id_header_session_client(self):
        global_id = "req-%s" % uuid.uuid4()
        kwargs = {'global_request_id': global_id}
        auth = token_endpoint.Token(self.endpoint, self.token)
        sess = session.Session(auth=auth)
        http_client = http.SessionClient(sess, **kwargs)

        path = '/v2/images/my-image'
        self.mock.get(self.endpoint + path)
        http_client.get(path)

        headers = self.mock.last_request.headers
        self.assertEqual(global_id, headers['X-OpenStack-Request-ID'])

    def test_raw_request(self):
        """Verify the path being used for HTTP requests reflects accurately."""
        headers = {"Content-Type": "text/plain"}
        text = 'Ok'
        path = '/v1/images/detail'

        self.mock.get(self.endpoint + path, text=text, headers=headers)

        resp, body = self.client.get('/v1/images/detail', headers=headers)
        self.assertEqual(headers, resp.headers)
        self.assertEqual(text, resp.text)

    def test_parse_endpoint(self):
        endpoint = 'http://example.com:9292'
        test_client = http.HTTPClient(endpoint, token='adc123')
        actual = test_client.parse_endpoint(endpoint)
        expected = parse.SplitResult(scheme='http',
                                     netloc='example.com:9292', path='',
                                     query='', fragment='')
        self.assertEqual(expected, actual)

    def test_get_connections_kwargs_http(self):
        endpoint = 'http://example.com:9292'
        test_client = http.HTTPClient(endpoint, token='adc123')
        self.assertEqual(600.0, test_client.timeout)

    def test__chunk_body_exact_size_chunk(self):
        test_client = http._BaseHTTPClient()
        bytestring = b'x' * http.CHUNKSIZE
        data = io.BytesIO(bytestring)
        chunk = list(test_client._chunk_body(data))
        self.assertEqual(1, len(chunk))
        self.assertEqual([bytestring], chunk)

    def test_http_chunked_request(self):
        text = "Ok"
        data = io.StringIO(text)
        path = '/v1/images/'
        self.mock.post(self.endpoint + path, text=text)

        headers = {"test": 'chunked_request'}
        resp, body = self.client.post(path, headers=headers, data=data)
        self.assertIsInstance(self.mock.last_request.body, types.GeneratorType)
        self.assertEqual(text, resp.text)

    def test_http_json(self):
        data = {"test": "json_request"}
        path = '/v1/images'
        text = 'OK'
        self.mock.post(self.endpoint + path, text=text)

        headers = {"test": 'chunked_request'}
        resp, body = self.client.post(path, headers=headers, data=data)

        self.assertEqual(text, resp.text)
        self.assertIsInstance(self.mock.last_request.body, str)
        self.assertEqual(data, json.loads(self.mock.last_request.body))

    def test_http_chunked_response(self):
        data = b"TEST"
        path = '/v1/images/'
        self.mock.get(self.endpoint + path, body=io.BytesIO(data),
                      headers={"Content-Type": "application/octet-stream"})

        resp, body = self.client.get(path)
        self.assertIsInstance(body, types.GeneratorType)
        self.assertEqual([data], list(body))

    @original_only
    def test_log_http_response_with_non_ascii_char(self):
        try:
            response = 'Ok'
            headers = {"Content-Type": "text/plain",
                       "test": "value1\xa5\xa6"}
            fake = utils.FakeResponse(headers, io.StringIO(response))
            self.client.log_http_response(fake)
        except UnicodeDecodeError as e:
            self.fail("Unexpected UnicodeDecodeError exception '%s'" % e)

    @original_only
    def test_log_curl_request_with_non_ascii_char(self):
        try:
            headers = {'header1': 'value1\xa5\xa6'}
            body = 'examplebody\xa5\xa6'
            self.client.log_curl_request('GET', '/api/v1/\xa5', headers, body,
                                         None)
        except UnicodeDecodeError as e:
            self.fail("Unexpected UnicodeDecodeError exception '%s'" % e)

    @original_only
    @mock.patch('glanceclient.common.http.LOG.debug')
    def test_log_curl_request_with_body_and_header(self, mock_log):
        hd_name = 'header1'
        hd_val = 'value1'
        headers = {hd_name: hd_val}
        body = 'examplebody'
        self.client.log_curl_request('GET', '/api/v1/', headers, body, None)
        self.assertTrue(mock_log.called, 'LOG.debug never called')
        self.assertTrue(mock_log.call_args[0],
                        'LOG.debug called with no arguments')
        hd_regex = r".*\s-H\s+'\s*%s\s*:\s*%s\s*'.*" % (hd_name, hd_val)
        self.assertThat(mock_log.call_args[0][0],
                        matchers.MatchesRegex(hd_regex),
                        'header not found in curl command')
        body_regex = r".*\s-d\s+'%s'\s.*" % body
        self.assertThat(mock_log.call_args[0][0],
                        matchers.MatchesRegex(body_regex),
                        'body not found in curl command')

    def _test_log_curl_request_with_certs(self, mock_log, key, cert, cacert):
        headers = {'header1': 'value1'}
        http_client_object = http.HTTPClient(self.ssl_endpoint, key_file=key,
                                             cert_file=cert, cacert=cacert,
                                             token='fake-token')
        http_client_object.log_curl_request('GET', '/api/v1/', headers, None,
                                            None)
        self.assertTrue(mock_log.called, 'LOG.debug never called')
        self.assertTrue(mock_log.call_args[0],
                        'LOG.debug called with no arguments')

        needles = {'key': key, 'cert': cert, 'cacert': cacert}
        for option, value in needles.items():
            if value:
                regex = r".*\s--%s\s+('%s'|%s).*" % (option, value, value)
                self.assertThat(mock_log.call_args[0][0],
                                matchers.MatchesRegex(regex),
                                'no --%s option in curl command' % option)
            else:
                regex = r".*\s--%s\s+.*" % option
                self.assertThat(mock_log.call_args[0][0],
                                matchers.Not(matchers.MatchesRegex(regex)),
                                'unexpected --%s option in curl command' %
                                option)

    @mock.patch('glanceclient.common.http.LOG.debug')
    def test_log_curl_request_with_all_certs(self, mock_log):
        self._test_log_curl_request_with_certs(mock_log, 'key1', 'cert1',
                                               'cacert2')

    @mock.patch('glanceclient.common.http.LOG.debug')
    def test_log_curl_request_with_some_certs(self, mock_log):
        self._test_log_curl_request_with_certs(mock_log, 'key1', 'cert1', None)

    @mock.patch('glanceclient.common.http.LOG.debug')
    def test_log_curl_request_with_insecure_param(self, mock_log):
        headers = {'header1': 'value1'}
        http_client_object = http.HTTPClient(self.ssl_endpoint, insecure=True,
                                             token='fake-token')
        http_client_object.log_curl_request('GET', '/api/v1/', headers, None,
                                            None)
        self.assertTrue(mock_log.called, 'LOG.debug never called')
        self.assertTrue(mock_log.call_args[0],
                        'LOG.debug called with no arguments')
        self.assertThat(mock_log.call_args[0][0],
                        matchers.MatchesRegex(r'.*\s-k\s.*'),
                        'no -k option in curl command')

    @mock.patch('glanceclient.common.http.LOG.debug')
    def test_log_curl_request_with_token_header(self, mock_log):
        fake_token = 'fake-token'
        headers = {'X-Auth-Token': fake_token}
        http_client_object = http.HTTPClient(self.endpoint,
                                             identity_headers=headers)
        http_client_object.log_curl_request('GET', '/api/v1/', headers, None,
                                            None)
        self.assertTrue(mock_log.called, 'LOG.debug never called')
        self.assertTrue(mock_log.call_args[0],
                        'LOG.debug called with no arguments')
        token_regex = '.*%s.*' % fake_token
        self.assertThat(mock_log.call_args[0][0],
                        matchers.Not(matchers.MatchesRegex(token_regex)),
                        'token found in LOG.debug parameter')

    def test_log_request_id_once(self):
        logger = self.useFixture(fixtures.FakeLogger(level=logging.DEBUG))
        data = b"TEST"
        path = '/v1/images/'
        self.mock.get(self.endpoint + path, body=io.BytesIO(data),
                      headers={"Content-Type": "application/octet-stream",
                               'x-openstack-request-id': "1234"})

        resp, body = self.client.get(path)
        self.assertIsInstance(body, types.GeneratorType)
        self.assertEqual([data], list(body))
        expected_log = ("GET call to image "
                        "for http://example.com:9292/v1/images/ "
                        "used request id 1234")
        self.assertEqual(1, logger.output.count(expected_log))

    def test_expired_token_has_changed(self):
        # instantiate client with some token
        fake_token = b'fake-token'
        http_client = http.HTTPClient(self.endpoint,
                                      token=fake_token)
        path = '/v1/images/my-image'
        self.mock.get(self.endpoint + path)
        http_client.get(path)
        headers = self.mock.last_request.headers
        self.assertEqual(fake_token, headers['X-Auth-Token'])
        # refresh the token
        refreshed_token = b'refreshed-token'
        http_client.auth_token = refreshed_token
        http_client.get(path)
        headers = self.mock.last_request.headers
        self.assertEqual(refreshed_token, headers['X-Auth-Token'])
        # regression check for bug 1448080
        unicode_token = 'ni\xf1o+=='
        http_client.auth_token = unicode_token
        http_client.get(path)
        headers = self.mock.last_request.headers
        # Bug #1766235: According to RFC 8187, headers must be
        # encoded as 7-bit ASCII, so expect to see only displayable
        # chars in percent-encoding. The '+' and '= 'chars will not
        # be changed.
        self.assertEqual(b'ni%C3%B1o+==', headers['X-Auth-Token'])
