# Copyright 2010 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 mock
from oslo_serialization import jsonutils
import six
import webob
import webob.dec
import webob.exc

from nova.api import openstack as openstack_api
from nova.api.openstack import extensions
from nova.api.openstack import wsgi
from nova import exception
from nova import test
from nova.tests.unit.api.openstack import fakes


class APITest(test.NoDBTestCase):

    def setUp(self):
        super(APITest, self).setUp()

    @property
    def wsgi_app(self):
        with mock.patch.object(extensions.ExtensionManager, 'load_extension'):
            # patch load_extension because it's expensive in fakes.wsgi_app
            return fakes.wsgi_app(init_only=('versions',))

    def _wsgi_app(self, inner_app):
        # simpler version of the app than fakes.wsgi_app
        return openstack_api.FaultWrapper(inner_app)

    def test_malformed_json(self):
        req = webob.Request.blank('/')
        req.method = 'POST'
        req.body = b'{'
        req.headers["content-type"] = "application/json"

        res = req.get_response(self.wsgi_app)
        self.assertEqual(res.status_int, 400)

    def test_malformed_xml(self):
        req = webob.Request.blank('/')
        req.method = 'POST'
        req.body = b'<hi im not xml>'
        req.headers["content-type"] = "application/xml"

        res = req.get_response(self.wsgi_app)
        self.assertEqual(res.status_int, 400)

    def test_vendor_content_type_json(self):
        ctype = 'application/vnd.openstack.compute+json'

        req = webob.Request.blank('/')
        req.headers['Accept'] = ctype

        res = req.get_response(self.wsgi_app)
        self.assertEqual(res.status_int, 200)
        self.assertEqual(res.content_type, ctype)

        jsonutils.loads(res.body)

    def test_exceptions_are_converted_to_faults_webob_exc(self):
        @webob.dec.wsgify
        def raise_webob_exc(req):
            raise webob.exc.HTTPNotFound(explanation='Raised a webob.exc')

        # api.application = raise_webob_exc
        api = self._wsgi_app(raise_webob_exc)
        resp = webob.Request.blank('/').get_response(api)
        self.assertEqual(resp.status_int, 404, resp.body)

    def test_exceptions_are_converted_to_faults_api_fault(self):
        @webob.dec.wsgify
        def raise_api_fault(req):
            exc = webob.exc.HTTPNotFound(explanation='Raised a webob.exc')
            return wsgi.Fault(exc)

        # api.application = raise_api_fault
        api = self._wsgi_app(raise_api_fault)
        resp = webob.Request.blank('/').get_response(api)
        self.assertIn('itemNotFound', resp.body)
        self.assertEqual(resp.status_int, 404, resp.body)

    def test_exceptions_are_converted_to_faults_exception(self):
        @webob.dec.wsgify
        def fail(req):
            raise Exception("Threw an exception")

        # api.application = fail
        api = self._wsgi_app(fail)
        resp = webob.Request.blank('/').get_response(api)
        self.assertIn('{"computeFault', resp.body)
        self.assertEqual(resp.status_int, 500, resp.body)

    def _do_test_exception_safety_reflected_in_faults(self, expose):
        class ExceptionWithSafety(exception.NovaException):
            safe = expose

        @webob.dec.wsgify
        def fail(req):
            raise ExceptionWithSafety('some explanation')

        api = self._wsgi_app(fail)
        resp = webob.Request.blank('/').get_response(api)
        self.assertIn('{"computeFault', resp.body)
        expected = ('ExceptionWithSafety: some explanation' if expose else
                    'The server has either erred or is incapable '
                    'of performing the requested operation.')
        self.assertIn(expected, resp.body)
        self.assertEqual(resp.status_int, 500, resp.body)

    def test_safe_exceptions_are_described_in_faults(self):
        self._do_test_exception_safety_reflected_in_faults(True)

    def test_unsafe_exceptions_are_not_described_in_faults(self):
        self._do_test_exception_safety_reflected_in_faults(False)

    def _do_test_exception_mapping(self, exception_type, msg):
        @webob.dec.wsgify
        def fail(req):
            raise exception_type(msg)

        api = self._wsgi_app(fail)
        resp = webob.Request.blank('/').get_response(api)
        self.assertIn(msg, resp.body)
        self.assertEqual(resp.status_int, exception_type.code, resp.body)

        if hasattr(exception_type, 'headers'):
            for (key, value) in six.iteritems(exception_type.headers):
                self.assertIn(key, resp.headers)
                self.assertEqual(resp.headers[key], str(value))

    def test_quota_error_mapping(self):
        self._do_test_exception_mapping(exception.QuotaError, 'too many used')

    def test_non_nova_notfound_exception_mapping(self):
        class ExceptionWithCode(Exception):
            code = 404

        self._do_test_exception_mapping(ExceptionWithCode,
                                        'NotFound')

    def test_non_nova_exception_mapping(self):
        class ExceptionWithCode(Exception):
            code = 417

        self._do_test_exception_mapping(ExceptionWithCode,
                                        'Expectation failed')

    def test_exception_with_none_code_throws_500(self):
        class ExceptionWithNoneCode(Exception):
            code = None

        @webob.dec.wsgify
        def fail(req):
            raise ExceptionWithNoneCode()

        api = self._wsgi_app(fail)
        resp = webob.Request.blank('/').get_response(api)
        self.assertEqual(500, resp.status_int)


class APITestV21(APITest):

    @property
    def wsgi_app(self):
        return fakes.wsgi_app_v21(init_only=('versions',))

    # TODO(alex_xu): Get rid of the case translate NovaException to
    # HTTPException after V2 api code removed. Because V2.1 API required raise
    # HTTPException explicitly, so V2.1 API needn't such translation.
