import unittest

from django.core.exceptions import ImproperlyConfigured
from django.core.handlers.wsgi import WSGIHandler, WSGIRequest, get_script_name
from django.core.signals import request_finished, request_started
from django.db import close_old_connections, connection
from django.test import (
    RequestFactory, SimpleTestCase, TransactionTestCase, override_settings,
)

try:
    from http import HTTPStatus
except ImportError:  # Python < 3.5
    HTTPStatus = None


class HandlerTests(SimpleTestCase):

    def setUp(self):
        request_started.disconnect(close_old_connections)

    def tearDown(self):
        request_started.connect(close_old_connections)

    def test_middleware_initialized(self):
        handler = WSGIHandler()
        self.assertIsNotNone(handler._request_middleware)

    def test_bad_path_info(self):
        """
        A non-UTF-8 path populates PATH_INFO with an URL-encoded path and
        produces a 404.
        """
        environ = RequestFactory().get('/').environ
        environ['PATH_INFO'] = '\xed'
        handler = WSGIHandler()
        response = handler(environ, lambda *a, **k: None)
        # The path of the request will be encoded to '/%ED'.
        self.assertEqual(response.status_code, 404)

    def test_non_ascii_query_string(self):
        """
        Non-ASCII query strings are properly decoded (#20530, #22996).
        """
        environ = RequestFactory().get('/').environ
        raw_query_strings = [
            b'want=caf%C3%A9',  # This is the proper way to encode 'café'
            b'want=caf\xc3\xa9',  # UA forgot to quote bytes
            b'want=caf%E9',  # UA quoted, but not in UTF-8
            b'want=caf\xe9',  # UA forgot to convert Latin-1 to UTF-8 and to quote (typical of MSIE)
        ]
        got = []
        for raw_query_string in raw_query_strings:
            # Simulate http.server.BaseHTTPRequestHandler.parse_request handling of raw request
            environ['QUERY_STRING'] = str(raw_query_string, 'iso-8859-1')
            request = WSGIRequest(environ)
            got.append(request.GET['want'])
        # %E9 is converted to the unicode replacement character by parse_qsl
        self.assertEqual(got, ['café', 'café', 'caf\ufffd', 'café'])

    def test_non_ascii_cookie(self):
        """Non-ASCII cookies set in JavaScript are properly decoded (#20557)."""
        environ = RequestFactory().get('/').environ
        raw_cookie = 'want="café"'.encode('utf-8').decode('iso-8859-1')
        environ['HTTP_COOKIE'] = raw_cookie
        request = WSGIRequest(environ)
        self.assertEqual(request.COOKIES['want'], "café")

    def test_invalid_unicode_cookie(self):
        """
        Invalid cookie content should result in an absent cookie, but not in a
        crash while trying to decode it (#23638).
        """
        environ = RequestFactory().get('/').environ
        environ['HTTP_COOKIE'] = 'x=W\x03c(h]\x8e'
        request = WSGIRequest(environ)
        # We don't test COOKIES content, as the result might differ between
        # Python version because parsing invalid content became stricter in
        # latest versions.
        self.assertIsInstance(request.COOKIES, dict)

    @override_settings(ROOT_URLCONF='handlers.urls')
    def test_invalid_multipart_boundary(self):
        """
        Invalid boundary string should produce a "Bad Request" response, not a
        server error (#23887).
        """
        environ = RequestFactory().post('/malformed_post/').environ
        environ['CONTENT_TYPE'] = 'multipart/form-data; boundary=WRONG\x07'
        handler = WSGIHandler()
        response = handler(environ, lambda *a, **k: None)
        # Expect "bad request" response
        self.assertEqual(response.status_code, 400)


@override_settings(ROOT_URLCONF='handlers.urls', MIDDLEWARE=[])
class TransactionsPerRequestTests(TransactionTestCase):

    available_apps = []

    def test_no_transaction(self):
        response = self.client.get('/in_transaction/')
        self.assertContains(response, 'False')

    def test_auto_transaction(self):
        old_atomic_requests = connection.settings_dict['ATOMIC_REQUESTS']
        try:
            connection.settings_dict['ATOMIC_REQUESTS'] = True
            response = self.client.get('/in_transaction/')
        finally:
            connection.settings_dict['ATOMIC_REQUESTS'] = old_atomic_requests
        self.assertContains(response, 'True')

    def test_no_auto_transaction(self):
        old_atomic_requests = connection.settings_dict['ATOMIC_REQUESTS']
        try:
            connection.settings_dict['ATOMIC_REQUESTS'] = True
            response = self.client.get('/not_in_transaction/')
        finally:
            connection.settings_dict['ATOMIC_REQUESTS'] = old_atomic_requests
        self.assertContains(response, 'False')


@override_settings(ROOT_URLCONF='handlers.urls')
class SignalsTests(SimpleTestCase):

    def setUp(self):
        self.signals = []
        self.signaled_environ = None
        request_started.connect(self.register_started)
        request_finished.connect(self.register_finished)

    def tearDown(self):
        request_started.disconnect(self.register_started)
        request_finished.disconnect(self.register_finished)

    def register_started(self, **kwargs):
        self.signals.append('started')
        self.signaled_environ = kwargs.get('environ')

    def register_finished(self, **kwargs):
        self.signals.append('finished')

    def test_request_signals(self):
        response = self.client.get('/regular/')
        self.assertEqual(self.signals, ['started', 'finished'])
        self.assertEqual(response.content, b"regular content")
        self.assertEqual(self.signaled_environ, response.wsgi_request.environ)

    def test_request_signals_streaming_response(self):
        response = self.client.get('/streaming/')
        self.assertEqual(self.signals, ['started'])
        self.assertEqual(b''.join(response.streaming_content), b"streaming content")
        self.assertEqual(self.signals, ['started', 'finished'])


def empty_middleware(get_response):
    pass


@override_settings(ROOT_URLCONF='handlers.urls')
class HandlerRequestTests(SimpleTestCase):

    def test_suspiciousop_in_view_returns_400(self):
        response = self.client.get('/suspicious/')
        self.assertEqual(response.status_code, 400)

    def test_invalid_urls(self):
        response = self.client.get('~%A9helloworld')
        self.assertContains(response, '~%A9helloworld', status_code=404)

        response = self.client.get('d%aao%aaw%aan%aal%aao%aaa%aad%aa/')
        self.assertContains(response, 'd%AAo%AAw%AAn%AAl%AAo%AAa%AAd%AA', status_code=404)

        response = self.client.get('/%E2%99%E2%99%A5/')
        self.assertContains(response, '%E2%99\u2665', status_code=404)

        response = self.client.get('/%E2%98%8E%E2%A9%E2%99%A5/')
        self.assertContains(response, '\u260e%E2%A9\u2665', status_code=404)

    def test_environ_path_info_type(self):
        environ = RequestFactory().get('/%E2%A8%87%87%A5%E2%A8%A0').environ
        self.assertIsInstance(environ['PATH_INFO'], str)

    @unittest.skipIf(HTTPStatus is None, 'HTTPStatus only exists on Python 3.5+')
    def test_handle_accepts_httpstatus_enum_value(self):
        def start_response(status, headers):
            start_response.status = status

        environ = RequestFactory().get('/httpstatus_enum/').environ
        WSGIHandler()(environ, start_response)
        self.assertEqual(start_response.status, '200 OK')

    @override_settings(MIDDLEWARE=['handlers.tests.empty_middleware'])
    def test_middleware_returns_none(self):
        msg = 'Middleware factory handlers.tests.empty_middleware returned None.'
        with self.assertRaisesMessage(ImproperlyConfigured, msg):
            self.client.get('/')


class ScriptNameTests(SimpleTestCase):
    def test_get_script_name(self):
        # Regression test for #23173
        # Test first without PATH_INFO
        script_name = get_script_name({'SCRIPT_URL': '/foobar/'})
        self.assertEqual(script_name, '/foobar/')

        script_name = get_script_name({'SCRIPT_URL': '/foobar/', 'PATH_INFO': '/'})
        self.assertEqual(script_name, '/foobar')

    def test_get_script_name_double_slashes(self):
        """
        WSGI squashes multiple successive slashes in PATH_INFO, get_script_name
        should take that into account when forming SCRIPT_NAME (#17133).
        """
        script_name = get_script_name({
            'SCRIPT_URL': '/mst/milestones//accounts/login//help',
            'PATH_INFO': '/milestones/accounts/login/help',
        })
        self.assertEqual(script_name, '/mst')
