# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright 2011 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# 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.

"""Unit tests for `cinder.wsgi`."""

import os.path
import ssl
import tempfile
import unittest
import urllib2

from oslo.config import cfg
import webob
import webob.dec

from cinder.api.middleware import fault
from cinder import exception
from cinder import test
from cinder import utils
import cinder.wsgi

CONF = cfg.CONF

TEST_VAR_DIR = os.path.abspath(os.path.join(os.path.dirname(__file__),
                               'var'))


class TestLoaderNothingExists(test.TestCase):
    """Loader tests where os.path.exists always returns False."""

    def setUp(self):
        super(TestLoaderNothingExists, self).setUp()
        self.stubs.Set(os.path, 'exists', lambda _: False)

    def test_config_not_found(self):
        self.assertRaises(
            cinder.exception.ConfigNotFound,
            cinder.wsgi.Loader,
        )


class TestLoaderNormalFilesystem(unittest.TestCase):
    """Loader tests with normal filesystem (unmodified os.path module)."""

    _paste_config = """
[app:test_app]
use = egg:Paste#static
document_root = /tmp
    """

    def setUp(self):
        self.config = tempfile.NamedTemporaryFile(mode="w+t")
        self.config.write(self._paste_config.lstrip())
        self.config.seek(0)
        self.config.flush()
        self.loader = cinder.wsgi.Loader(self.config.name)

    def test_config_found(self):
        self.assertEquals(self.config.name, self.loader.config_path)

    def test_app_not_found(self):
        self.assertRaises(
            cinder.exception.PasteAppNotFound,
            self.loader.load_app,
            "non-existent app",
        )

    def test_app_found(self):
        url_parser = self.loader.load_app("test_app")
        self.assertEquals("/tmp", url_parser.directory)

    def tearDown(self):
        self.config.close()


class TestWSGIServer(unittest.TestCase):
    """WSGI server tests."""
    def _ipv6_configured():
        try:
            out, err = utils.execute('cat', '/proc/net/if_inet6')
        except exception.ProcessExecutionError:
            return False

        if not out:
            return False
        return True

    def test_no_app(self):
        server = cinder.wsgi.Server("test_app", None)
        self.assertEquals("test_app", server.name)

    def test_start_random_port(self):
        server = cinder.wsgi.Server("test_random_port", None, host="127.0.0.1")
        self.assertEqual(0, server.port)
        server.start()
        self.assertNotEqual(0, server.port)
        server.stop()
        server.wait()

    @test.skip_if(not _ipv6_configured(),
                  "Test requires an IPV6 configured interface")
    def test_start_random_port_with_ipv6(self):
        server = cinder.wsgi.Server("test_random_port",
                                    None,
                                    host="::1")
        server.start()
        self.assertEqual("::1", server.host)
        self.assertNotEqual(0, server.port)
        server.stop()
        server.wait()

    def test_app(self):
        greetings = 'Hello, World!!!'

        def hello_world(env, start_response):
            if env['PATH_INFO'] != '/':
                start_response('404 Not Found',
                               [('Content-Type', 'text/plain')])
                return ['Not Found\r\n']
            start_response('200 OK', [('Content-Type', 'text/plain')])
            return [greetings]

        server = cinder.wsgi.Server("test_app", hello_world)
        server.start()

        response = urllib2.urlopen('http://127.0.0.1:%d/' % server.port)
        self.assertEquals(greetings, response.read())

        server.stop()

    def test_app_using_ssl(self):
        CONF.set_default("ssl_cert_file",
                         os.path.join(TEST_VAR_DIR, 'certificate.crt'))
        CONF.set_default("ssl_key_file",
                         os.path.join(TEST_VAR_DIR, 'privatekey.key'))

        greetings = 'Hello, World!!!'

        @webob.dec.wsgify
        def hello_world(req):
            return greetings

        server = cinder.wsgi.Server("test_app", hello_world)
        server.start()

        response = urllib2.urlopen('https://127.0.0.1:%d/' % server.port)
        self.assertEquals(greetings, response.read())

        server.stop()

    @test.skip_if(not _ipv6_configured(),
                  "Test requires an IPV6 configured interface")
    def test_app_using_ipv6_and_ssl(self):
        CONF.set_default("ssl_cert_file",
                         os.path.join(TEST_VAR_DIR, 'certificate.crt'))
        CONF.set_default("ssl_key_file",
                         os.path.join(TEST_VAR_DIR, 'privatekey.key'))

        greetings = 'Hello, World!!!'

        @webob.dec.wsgify
        def hello_world(req):
            return greetings

        server = cinder.wsgi.Server("test_app",
                                    hello_world,
                                    host="::1",
                                    port=0)
        server.start()

        response = urllib2.urlopen('https://[::1]:%d/' % server.port)
        self.assertEquals(greetings, response.read())

        server.stop()


class ExceptionTest(test.TestCase):

    def _wsgi_app(self, inner_app):
        return fault.FaultWrapper(inner_app)

    def _do_test_exception_safety_reflected_in_faults(self, expose):
        class ExceptionWithSafety(exception.CinderException):
            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.assertTrue('{"computeFault' in resp.body, resp.body)
        expected = ('ExceptionWithSafety: some explanation' if expose else
                    'The server has either erred or is incapable '
                    'of performing the requested operation.')
        self.assertTrue(expected in resp.body, 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.assertTrue(msg in resp.body, resp.body)
        self.assertEqual(resp.status_int, exception_type.code, resp.body)

        if hasattr(exception_type, 'headers'):
            for (key, value) in exception_type.headers.iteritems():
                self.assertTrue(key in resp.headers)
                self.assertEquals(resp.headers[key], value)

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

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

        self._do_test_exception_mapping(ExceptionWithCode,
                                        'NotFound')

    def test_non_cinder_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

        msg = 'Internal Server Error'

        @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)
