import unittest
from zope.interface import implementer

from pyramid import testing
from pyramid.exceptions import ConfigurationError
from pyramid.interfaces import IRequest, IResponse


class TestDeriveView(unittest.TestCase):
    def setUp(self):
        self.config = testing.setUp()
        self.config.set_default_csrf_options(require_csrf=False)

    def tearDown(self):
        self.config = None
        testing.tearDown()

    def _makeRequest(self):
        request = DummyRequest()
        request.registry = self.config.registry
        return request

    def _registerLogger(self):
        from pyramid.interfaces import IDebugLogger

        logger = DummyLogger()
        self.config.registry.registerUtility(logger, IDebugLogger)
        return logger

    def _registerSecurityPolicy(self, permissive):
        from pyramid.interfaces import ISecurityPolicy

        policy = DummySecurityPolicy(permissive)
        self.config.registry.registerUtility(policy, ISecurityPolicy)
        return policy

    def test_function_returns_non_adaptable(self):
        def view(request):
            return None

        result = self.config.derive_view(view)
        self.assertFalse(result is view)
        try:
            result(None, None)
        except ValueError as e:
            self.assertEqual(
                e.args[0],
                'Could not convert return value of the view callable function '
                'tests.test_viewderivers.view into a response '
                'object. The value returned was None. You may have forgotten '
                'to return a value from the view callable.',
            )
        else:  # pragma: no cover
            raise AssertionError

    def test_function_returns_non_adaptable_dict(self):
        def view(request):
            return {'a': 1}

        result = self.config.derive_view(view)
        self.assertFalse(result is view)
        try:
            result(None, None)
        except ValueError as e:
            self.assertEqual(
                e.args[0],
                "Could not convert return value of the view callable function "
                "tests.test_viewderivers.view into a response "
                "object. The value returned was {'a': 1}. You may have "
                "forgotten to define a renderer in the view configuration.",
            )
        else:  # pragma: no cover
            raise AssertionError

    def test_instance_returns_non_adaptable(self):
        class AView:
            def __call__(self, request):
                return None

        view = AView()
        result = self.config.derive_view(view)
        self.assertFalse(result is view)
        try:
            result(None, None)
        except ValueError as e:
            msg = e.args[0]
            self.assertTrue(
                msg.startswith(
                    'Could not convert return value of the view callable '
                    'object <tests.test_viewderivers.'
                )
            )
            self.assertTrue(
                msg.endswith(
                    '> into a response object. The value returned was None. '
                    'You may have forgotten to return a value from the view '
                    'callable.'
                )
            )
        else:  # pragma: no cover
            raise AssertionError

    def test_function_returns_true_Response_no_renderer(self):
        from pyramid.response import Response

        r = Response('Hello')

        def view(request):
            return r

        result = self.config.derive_view(view)
        self.assertFalse(result is view)
        response = result(None, None)
        self.assertEqual(response, r)

    def test_function_returns_true_Response_with_renderer(self):
        from pyramid.response import Response

        r = Response('Hello')

        def view(request):
            return r

        result = self.config.derive_view(view)
        self.assertFalse(result is view)
        response = result(None, None)
        self.assertEqual(response, r)

    def test_requestonly_default_method_returns_non_adaptable(self):
        request = DummyRequest()

        class AView:
            def __init__(self, request):
                pass

            def __call__(self):
                return None

        result = self.config.derive_view(AView)
        self.assertFalse(result is AView)
        try:
            result(None, request)
        except ValueError as e:
            self.assertEqual(
                e.args[0],
                'Could not convert return value of the view callable '
                'method __call__ of '
                'class tests.test_viewderivers.AView into a '
                'response object. The value returned was None. You may have '
                'forgotten to return a value from the view callable.',
            )
        else:  # pragma: no cover
            raise AssertionError

    def test_requestonly_nondefault_method_returns_non_adaptable(self):
        request = DummyRequest()

        class AView:
            def __init__(self, request):
                pass

            def theviewmethod(self):
                return None

        result = self.config.derive_view(AView, attr='theviewmethod')
        self.assertFalse(result is AView)
        try:
            result(None, request)
        except ValueError as e:
            self.assertEqual(
                e.args[0],
                'Could not convert return value of the view callable '
                'method theviewmethod of '
                'class tests.test_viewderivers.AView into a '
                'response object. The value returned was None. You may have '
                'forgotten to return a value from the view callable.',
            )
        else:  # pragma: no cover
            raise AssertionError

    def test_requestonly_function(self):
        response = DummyResponse()

        def view(request):
            return response

        result = self.config.derive_view(view)
        self.assertFalse(result is view)
        self.assertEqual(result(None, None), response)

    def test_requestonly_function_with_renderer(self):
        response = DummyResponse()

        class moo:
            def render_view(inself, req, resp, view_inst, ctx):
                self.assertEqual(req, request)
                self.assertEqual(resp, 'OK')
                self.assertEqual(view_inst, view)
                self.assertEqual(ctx, context)
                return response

            def clone(self):
                return self

        def view(request):
            return 'OK'

        result = self.config.derive_view(view, renderer=moo())
        self.assertFalse(result.__wraps__ is view)
        request = self._makeRequest()
        context = testing.DummyResource()
        self.assertEqual(result(context, request), response)

    def test_requestonly_function_with_renderer_request_override(self):
        def moo(info):
            def inner(value, system):
                self.assertEqual(value, 'OK')
                self.assertEqual(system['request'], request)
                self.assertEqual(system['context'], context)
                return b'moo'

            return inner

        def view(request):
            return 'OK'

        self.config.add_renderer('moo', moo)
        result = self.config.derive_view(view, renderer='string')
        self.assertFalse(result is view)
        request = self._makeRequest()
        request.override_renderer = 'moo'
        context = testing.DummyResource()
        self.assertEqual(result(context, request).body, b'moo')

    def test_requestonly_function_with_renderer_request_has_view(self):
        response = DummyResponse()

        class moo:
            def render_view(inself, req, resp, view_inst, ctx):
                self.assertEqual(req, request)
                self.assertEqual(resp, 'OK')
                self.assertEqual(view_inst, 'view')
                self.assertEqual(ctx, context)
                return response

            def clone(self):
                return self

        def view(request):
            return 'OK'

        result = self.config.derive_view(view, renderer=moo())
        self.assertFalse(result.__wraps__ is view)
        request = self._makeRequest()
        request.__view__ = 'view'
        context = testing.DummyResource()
        r = result(context, request)
        self.assertEqual(r, response)
        self.assertFalse(hasattr(request, '__view__'))

    def test_class_without_attr(self):
        response = DummyResponse()

        class View:
            def __init__(self, request):
                pass

            def __call__(self):
                return response

        result = self.config.derive_view(View)
        request = self._makeRequest()
        self.assertEqual(result(None, request), response)
        self.assertEqual(request.__view__.__class__, View)

    def test_class_with_attr(self):
        response = DummyResponse()

        class View:
            def __init__(self, request):
                pass

            def another(self):
                return response

        result = self.config.derive_view(View, attr='another')
        request = self._makeRequest()
        self.assertEqual(result(None, request), response)
        self.assertEqual(request.__view__.__class__, View)

    def test_as_function_context_and_request(self):
        def view(context, request):
            return 'OK'

        result = self.config.derive_view(view)
        self.assertTrue(result.__wraps__ is view)
        self.assertFalse(hasattr(result, '__call_permissive__'))
        self.assertEqual(view(None, None), 'OK')

    def test_as_function_requestonly(self):
        response = DummyResponse()

        def view(request):
            return response

        result = self.config.derive_view(view)
        self.assertFalse(result is view)
        self.assertEqual(view.__module__, result.__module__)
        self.assertEqual(view.__doc__, result.__doc__)
        self.assertEqual(view.__name__, result.__name__)
        self.assertFalse(hasattr(result, '__call_permissive__'))
        self.assertEqual(result(None, None), response)

    def test_as_newstyle_class_context_and_request(self):
        response = DummyResponse()

        class view:
            def __init__(self, context, request):
                pass

            def __call__(self):
                return response

        result = self.config.derive_view(view)
        self.assertFalse(result is view)
        self.assertEqual(view.__module__, result.__module__)
        self.assertEqual(view.__doc__, result.__doc__)
        self.assertEqual(view.__name__, result.__name__)
        self.assertFalse(hasattr(result, '__call_permissive__'))
        request = self._makeRequest()
        self.assertEqual(result(None, request), response)
        self.assertEqual(request.__view__.__class__, view)

    def test_as_newstyle_class_requestonly(self):
        response = DummyResponse()

        class view:
            def __init__(self, context, request):
                pass

            def __call__(self):
                return response

        result = self.config.derive_view(view)
        self.assertFalse(result is view)
        self.assertEqual(view.__module__, result.__module__)
        self.assertEqual(view.__doc__, result.__doc__)
        self.assertEqual(view.__name__, result.__name__)
        self.assertFalse(hasattr(result, '__call_permissive__'))
        request = self._makeRequest()
        self.assertEqual(result(None, request), response)
        self.assertEqual(request.__view__.__class__, view)

    def test_as_oldstyle_class_context_and_request(self):
        response = DummyResponse()

        class view:
            def __init__(self, context, request):
                pass

            def __call__(self):
                return response

        result = self.config.derive_view(view)
        self.assertFalse(result is view)
        self.assertEqual(view.__module__, result.__module__)
        self.assertEqual(view.__doc__, result.__doc__)
        self.assertEqual(view.__name__, result.__name__)
        self.assertFalse(hasattr(result, '__call_permissive__'))
        request = self._makeRequest()
        self.assertEqual(result(None, request), response)
        self.assertEqual(request.__view__.__class__, view)

    def test_as_oldstyle_class_requestonly(self):
        response = DummyResponse()

        class view:
            def __init__(self, context, request):
                pass

            def __call__(self):
                return response

        result = self.config.derive_view(view)
        self.assertFalse(result is view)
        self.assertEqual(view.__module__, result.__module__)
        self.assertEqual(view.__doc__, result.__doc__)
        self.assertEqual(view.__name__, result.__name__)
        self.assertFalse(hasattr(result, '__call_permissive__'))
        request = self._makeRequest()
        self.assertEqual(result(None, request), response)
        self.assertEqual(request.__view__.__class__, view)

    def test_as_instance_context_and_request(self):
        response = DummyResponse()

        class View:
            def __call__(self, context, request):
                return response

        view = View()
        result = self.config.derive_view(view)
        self.assertTrue(result.__wraps__ is view)
        self.assertFalse(hasattr(result, '__call_permissive__'))
        self.assertEqual(result(None, None), response)

    def test_as_instance_requestonly(self):
        response = DummyResponse()

        class View:
            def __call__(self, request):
                return response

        view = View()
        result = self.config.derive_view(view)
        self.assertFalse(result is view)
        self.assertEqual(view.__module__, result.__module__)
        self.assertEqual(view.__doc__, result.__doc__)
        self.assertTrue('test_viewderivers' in result.__name__)
        self.assertFalse(hasattr(result, '__call_permissive__'))
        self.assertEqual(result(None, None), response)

    def test_with_debug_authorization_no_security_policy(self):
        response = DummyResponse()
        view = lambda *arg: response
        self.config.registry.settings = dict(
            debug_authorization=True, reload_templates=True
        )
        logger = self._registerLogger()
        result = self.config._derive_view(view, permission='view')
        self.assertEqual(view.__module__, result.__module__)
        self.assertEqual(view.__doc__, result.__doc__)
        self.assertEqual(view.__name__, result.__name__)
        self.assertFalse(hasattr(result, '__call_permissive__'))
        request = self._makeRequest()
        request.view_name = 'view_name'
        request.url = 'url'
        self.assertEqual(result(None, request), response)
        self.assertEqual(len(logger.messages), 1)
        self.assertEqual(
            logger.messages[0],
            "debug_authorization of url url (view name "
            "'view_name' against context None): Allowed "
            "(no security policy in use)",
        )

    def test_with_debug_authorization_no_permission(self):
        response = DummyResponse()
        view = lambda *arg: response
        self.config.registry.settings = dict(
            debug_authorization=True, reload_templates=True
        )
        self._registerSecurityPolicy(True)
        logger = self._registerLogger()
        result = self.config._derive_view(view)
        self.assertEqual(view.__module__, result.__module__)
        self.assertEqual(view.__doc__, result.__doc__)
        self.assertEqual(view.__name__, result.__name__)
        self.assertFalse(hasattr(result, '__call_permissive__'))
        request = self._makeRequest()
        request.view_name = 'view_name'
        request.url = 'url'
        self.assertEqual(result(None, request), response)
        self.assertEqual(len(logger.messages), 1)
        self.assertEqual(
            logger.messages[0],
            "debug_authorization of url url (view name "
            "'view_name' against context None): Allowed ("
            "no permission registered)",
        )

    def test_debug_auth_permission_authpol_permitted(self):
        response = DummyResponse()
        view = lambda *arg: response
        self.config.registry.settings = dict(
            debug_authorization=True, reload_templates=True
        )
        logger = self._registerLogger()
        self._registerSecurityPolicy(True)
        result = self.config._derive_view(view, permission='view')
        self.assertEqual(view.__module__, result.__module__)
        self.assertEqual(view.__doc__, result.__doc__)
        self.assertEqual(view.__name__, result.__name__)
        self.assertEqual(result.__call_permissive__.__wraps__, view)
        request = self._makeRequest()
        request.view_name = 'view_name'
        request.url = 'url'
        self.assertEqual(result(None, request), response)
        self.assertEqual(len(logger.messages), 1)
        self.assertEqual(
            logger.messages[0],
            "debug_authorization of url url (view name "
            "'view_name' against context None): True",
        )

    def test_debug_auth_permission_authpol_permitted_no_request(self):
        response = DummyResponse()
        view = lambda *arg: response
        self.config.registry.settings = dict(
            debug_authorization=True, reload_templates=True
        )
        logger = self._registerLogger()
        self._registerSecurityPolicy(True)
        result = self.config._derive_view(view, permission='view')
        self.assertEqual(view.__module__, result.__module__)
        self.assertEqual(view.__doc__, result.__doc__)
        self.assertEqual(view.__name__, result.__name__)
        self.assertEqual(result.__call_permissive__.__wraps__, view)
        self.assertEqual(result(None, None), response)
        self.assertEqual(len(logger.messages), 1)
        self.assertEqual(
            logger.messages[0],
            "debug_authorization of url None (view name "
            "None against context None): True",
        )

    def test_debug_auth_permission_authpol_denied(self):
        from pyramid.httpexceptions import HTTPForbidden

        response = DummyResponse()
        view = lambda *arg: response
        self.config.registry.settings = dict(
            debug_authorization=True, reload_templates=True
        )
        logger = self._registerLogger()
        self._registerSecurityPolicy(False)
        result = self.config._derive_view(view, permission='view')
        self.assertEqual(view.__module__, result.__module__)
        self.assertEqual(view.__doc__, result.__doc__)
        self.assertEqual(view.__name__, result.__name__)
        self.assertEqual(result.__call_permissive__.__wraps__, view)
        request = self._makeRequest()
        request.view_name = 'view_name'
        request.url = 'url'
        self.assertRaises(HTTPForbidden, result, None, request)
        self.assertEqual(len(logger.messages), 1)
        self.assertEqual(
            logger.messages[0],
            "debug_authorization of url url (view name "
            "'view_name' against context None): False",
        )

    def test_debug_auth_permission_authpol_denied2(self):
        view = lambda *arg: 'OK'
        self.config.registry.settings = dict(
            debug_authorization=True, reload_templates=True
        )
        self._registerLogger()
        self._registerSecurityPolicy(False)
        result = self.config._derive_view(view, permission='view')
        self.assertEqual(view.__module__, result.__module__)
        self.assertEqual(view.__doc__, result.__doc__)
        self.assertEqual(view.__name__, result.__name__)
        request = self._makeRequest()
        request.view_name = 'view_name'
        request.url = 'url'
        permitted = result.__permitted__(None, None)
        self.assertEqual(permitted, False)

    def test_debug_auth_permission_authpol_overridden(self):
        from pyramid.security import NO_PERMISSION_REQUIRED

        response = DummyResponse()
        view = lambda *arg: response
        self.config.registry.settings = dict(
            debug_authorization=True, reload_templates=True
        )
        logger = self._registerLogger()
        self._registerSecurityPolicy(False)
        result = self.config._derive_view(
            view, permission=NO_PERMISSION_REQUIRED
        )
        self.assertEqual(view.__module__, result.__module__)
        self.assertEqual(view.__doc__, result.__doc__)
        self.assertEqual(view.__name__, result.__name__)
        self.assertFalse(hasattr(result, '__call_permissive__'))
        request = self._makeRequest()
        request.view_name = 'view_name'
        request.url = 'url'
        self.assertEqual(result(None, request), response)
        self.assertEqual(len(logger.messages), 1)
        self.assertEqual(
            logger.messages[0],
            "debug_authorization of url url (view name "
            "'view_name' against context None): "
            "Allowed (NO_PERMISSION_REQUIRED)",
        )

    def test_debug_auth_permission_authpol_permitted_excview(self):
        response = DummyResponse()
        view = lambda *arg: response
        self.config.registry.settings = dict(
            debug_authorization=True, reload_templates=True
        )
        logger = self._registerLogger()
        self._registerSecurityPolicy(True)
        result = self.config._derive_view(
            view, context=Exception, permission='view'
        )
        self.assertEqual(view.__module__, result.__module__)
        self.assertEqual(view.__doc__, result.__doc__)
        self.assertEqual(view.__name__, result.__name__)
        self.assertEqual(result.__call_permissive__.__wraps__, view)
        request = self._makeRequest()
        request.view_name = 'view_name'
        request.url = 'url'
        self.assertEqual(result(Exception(), request), response)
        self.assertEqual(len(logger.messages), 1)
        self.assertEqual(
            logger.messages[0],
            "debug_authorization of url url (view name "
            "'view_name' against context Exception()): True",
        )

    def test_secured_view_authn_policy_no_security_policy(self):
        response = DummyResponse()
        view = lambda *arg: response
        self.config.registry.settings = {}

        result = self.config._derive_view(view, permission='view')
        self.assertEqual(view.__module__, result.__module__)
        self.assertEqual(view.__doc__, result.__doc__)
        self.assertEqual(view.__name__, result.__name__)
        self.assertFalse(hasattr(result, '__call_permissive__'))
        request = self._makeRequest()
        request.view_name = 'view_name'
        request.url = 'url'
        self.assertEqual(result(None, request), response)

    def test_secured_view_raises_forbidden_no_name(self):
        from pyramid.httpexceptions import HTTPForbidden

        response = DummyResponse()
        view = lambda *arg: response
        self.config.registry.settings = {}
        self._registerSecurityPolicy(False)
        result = self.config._derive_view(view, permission='view')
        request = self._makeRequest()
        request.view_name = 'view_name'
        request.url = 'url'
        with self.assertRaises(HTTPForbidden) as cm:
            result(None, request)
        self.assertEqual(
            cm.exception.message,
            'Unauthorized: <lambda> failed permission check',
        )

    def test_secured_view_raises_forbidden_with_name(self):
        from pyramid.httpexceptions import HTTPForbidden

        def myview(request):  # pragma: no cover
            pass

        self.config.registry.settings = {}
        self._registerSecurityPolicy(False)
        result = self.config._derive_view(myview, permission='view')
        request = self._makeRequest()
        request.view_name = 'view_name'
        request.url = 'url'
        with self.assertRaises(HTTPForbidden) as cm:
            result(None, request)
        self.assertEqual(
            cm.exception.message,
            'Unauthorized: myview failed permission check',
        )

    def test_secured_view_skipped_by_default_on_exception_view(self):
        from pyramid.request import Request
        from pyramid.security import NO_PERMISSION_REQUIRED

        def view(request):
            raise ValueError

        def excview(request):
            return 'hello'

        self._registerSecurityPolicy(False)
        self.config.add_settings({'debug_authorization': True})
        self.config.set_default_permission('view')
        self.config.add_view(
            view, name='foo', permission=NO_PERMISSION_REQUIRED
        )
        self.config.add_view(excview, context=ValueError, renderer='string')
        app = self.config.make_wsgi_app()
        request = Request.blank('/foo', base_url='http://example.com')
        request.method = 'POST'
        response = request.get_response(app)
        self.assertTrue(b'hello' in response.body)

    def test_secured_view_failed_on_explicit_exception_view(self):
        from pyramid.httpexceptions import HTTPForbidden
        from pyramid.request import Request
        from pyramid.security import NO_PERMISSION_REQUIRED

        def view(request):
            raise ValueError

        def excview(request):  # pragma: no cover
            pass

        self._registerSecurityPolicy(False)
        self.config.add_view(
            view, name='foo', permission=NO_PERMISSION_REQUIRED
        )
        self.config.add_view(
            excview, context=ValueError, renderer='string', permission='view'
        )
        app = self.config.make_wsgi_app()
        request = Request.blank('/foo', base_url='http://example.com')
        request.method = 'POST'
        with self.assertRaises(HTTPForbidden):
            request.get_response(app)

    def test_secured_view_passed_on_explicit_exception_view(self):
        from pyramid.request import Request
        from pyramid.security import NO_PERMISSION_REQUIRED

        def view(request):
            raise ValueError

        def excview(request):
            return 'hello'

        self._registerSecurityPolicy(True)
        self.config.add_view(
            view, name='foo', permission=NO_PERMISSION_REQUIRED
        )
        self.config.add_view(
            excview, context=ValueError, renderer='string', permission='view'
        )
        app = self.config.make_wsgi_app()
        request = Request.blank('/foo', base_url='http://example.com')
        request.method = 'POST'
        request.headers['X-CSRF-Token'] = 'foo'
        response = request.get_response(app)
        self.assertTrue(b'hello' in response.body)

    def test_predicate_mismatch_view_has_no_name(self):
        from pyramid.exceptions import PredicateMismatch

        response = DummyResponse()
        view = lambda *arg: response

        def predicate1(context, request):
            return False

        predicate1.text = lambda *arg: 'text'
        result = self.config._derive_view(view, predicates=[predicate1])
        request = self._makeRequest()
        request.method = 'POST'
        try:
            result(None, None)
        except PredicateMismatch as e:
            self.assertEqual(
                e.detail, 'predicate mismatch for view <lambda> (text)'
            )
        else:  # pragma: no cover
            raise AssertionError

    def test_predicate_mismatch_view_has_name(self):
        from pyramid.exceptions import PredicateMismatch

        def myview(request):  # pragma: no cover
            pass

        def predicate1(context, request):
            return False

        predicate1.text = lambda *arg: 'text'
        result = self.config._derive_view(myview, predicates=[predicate1])
        request = self._makeRequest()
        request.method = 'POST'
        try:
            result(None, None)
        except PredicateMismatch as e:
            self.assertEqual(
                e.detail, 'predicate mismatch for view myview (text)'
            )
        else:  # pragma: no cover
            raise AssertionError

    def test_predicate_mismatch_exception_has_text_in_detail(self):
        from pyramid.exceptions import PredicateMismatch

        def myview(request):  # pragma: no cover
            pass

        def predicate1(context, request):
            return True

        predicate1.text = lambda *arg: 'pred1'

        def predicate2(context, request):
            return False

        predicate2.text = lambda *arg: 'pred2'
        result = self.config._derive_view(
            myview, predicates=[predicate1, predicate2]
        )
        request = self._makeRequest()
        request.method = 'POST'
        try:
            result(None, None)
        except PredicateMismatch as e:
            self.assertEqual(
                e.detail, 'predicate mismatch for view myview (pred2)'
            )
        else:  # pragma: no cover
            raise AssertionError

    def test_with_predicates_all(self):
        response = DummyResponse()
        view = lambda *arg: response
        predicates = []

        def predicate1(context, request):
            predicates.append(True)
            return True

        def predicate2(context, request):
            predicates.append(True)
            return True

        result = self.config._derive_view(
            view, predicates=[predicate1, predicate2]
        )
        request = self._makeRequest()
        request.method = 'POST'
        next = result(None, None)
        self.assertEqual(next, response)
        self.assertEqual(predicates, [True, True])

    def test_with_predicates_checker(self):
        view = lambda *arg: 'OK'
        predicates = []

        def predicate1(context, request):
            predicates.append(True)
            return True

        def predicate2(context, request):
            predicates.append(True)
            return True

        result = self.config._derive_view(
            view, predicates=[predicate1, predicate2]
        )
        request = self._makeRequest()
        request.method = 'POST'
        next = result.__predicated__(None, None)
        self.assertEqual(next, True)
        self.assertEqual(predicates, [True, True])

    def test_with_predicates_notall(self):
        from pyramid.httpexceptions import HTTPNotFound

        view = lambda *arg: 'OK'
        predicates = []

        def predicate1(context, request):
            predicates.append(True)
            return True

        predicate1.text = lambda *arg: 'text'

        def predicate2(context, request):
            predicates.append(True)
            return False

        predicate2.text = lambda *arg: 'text'
        result = self.config._derive_view(
            view, predicates=[predicate1, predicate2]
        )
        request = self._makeRequest()
        request.method = 'POST'
        self.assertRaises(HTTPNotFound, result, None, None)
        self.assertEqual(predicates, [True, True])

    def test_with_wrapper_viewname(self):
        from pyramid.interfaces import IView, IViewClassifier
        from pyramid.response import Response

        inner_response = Response('OK')

        def inner_view(context, request):
            return inner_response

        def outer_view(context, request):
            self.assertEqual(request.wrapped_response, inner_response)
            self.assertEqual(request.wrapped_body, inner_response.body)
            self.assertEqual(
                request.wrapped_view.__original_view__, inner_view
            )
            return Response(b'outer ' + request.wrapped_body)

        self.config.registry.registerAdapter(
            outer_view, (IViewClassifier, None, None), IView, 'owrap'
        )
        result = self.config._derive_view(
            inner_view, viewname='inner', wrapper_viewname='owrap'
        )
        self.assertFalse(result is inner_view)
        self.assertEqual(inner_view.__module__, result.__module__)
        self.assertEqual(inner_view.__doc__, result.__doc__)
        request = self._makeRequest()
        response = result(None, request)
        self.assertEqual(response.body, b'outer OK')

    def test_with_wrapper_viewname_notfound(self):
        from pyramid.response import Response

        inner_response = Response('OK')

        def inner_view(context, request):
            return inner_response

        wrapped = self.config._derive_view(
            inner_view, viewname='inner', wrapper_viewname='owrap'
        )
        request = self._makeRequest()
        self.assertRaises(ValueError, wrapped, None, request)

    def test_as_newstyle_class_context_and_request_attr_and_renderer(self):
        response = DummyResponse()

        class renderer:
            def render_view(inself, req, resp, view_inst, ctx):
                self.assertEqual(req, request)
                self.assertEqual(resp, {'a': '1'})
                self.assertEqual(view_inst.__class__, View)
                self.assertEqual(ctx, context)
                return response

            def clone(self):
                return self

        class View:
            def __init__(self, context, request):
                pass

            def index(self):
                return {'a': '1'}

        result = self.config._derive_view(
            View, renderer=renderer(), attr='index'
        )
        self.assertFalse(result is View)
        self.assertEqual(result.__module__, View.__module__)
        self.assertEqual(result.__doc__, View.__doc__)
        self.assertEqual(result.__name__, View.__name__)
        request = self._makeRequest()
        context = testing.DummyResource()
        self.assertEqual(result(context, request), response)

    def test_as_newstyle_class_requestonly_attr_and_renderer(self):
        response = DummyResponse()

        class renderer:
            def render_view(inself, req, resp, view_inst, ctx):
                self.assertEqual(req, request)
                self.assertEqual(resp, {'a': '1'})
                self.assertEqual(view_inst.__class__, View)
                self.assertEqual(ctx, context)
                return response

            def clone(self):
                return self

        class View:
            def __init__(self, request):
                pass

            def index(self):
                return {'a': '1'}

        result = self.config.derive_view(
            View, renderer=renderer(), attr='index'
        )
        self.assertFalse(result is View)
        self.assertEqual(result.__module__, View.__module__)
        self.assertEqual(result.__doc__, View.__doc__)
        self.assertEqual(result.__name__, View.__name__)
        request = self._makeRequest()
        context = testing.DummyResource()
        self.assertEqual(result(context, request), response)

    def test_as_oldstyle_cls_context_request_attr_and_renderer(self):
        response = DummyResponse()

        class renderer:
            def render_view(inself, req, resp, view_inst, ctx):
                self.assertEqual(req, request)
                self.assertEqual(resp, {'a': '1'})
                self.assertEqual(view_inst.__class__, View)
                self.assertEqual(ctx, context)
                return response

            def clone(self):
                return self

        class View:
            def __init__(self, context, request):
                pass

            def index(self):
                return {'a': '1'}

        result = self.config.derive_view(
            View, renderer=renderer(), attr='index'
        )
        self.assertFalse(result is View)
        self.assertEqual(result.__module__, View.__module__)
        self.assertEqual(result.__doc__, View.__doc__)
        self.assertEqual(result.__name__, View.__name__)
        request = self._makeRequest()
        context = testing.DummyResource()
        self.assertEqual(result(context, request), response)

    def test_as_oldstyle_cls_requestonly_attr_and_renderer(self):
        response = DummyResponse()

        class renderer:
            def render_view(inself, req, resp, view_inst, ctx):
                self.assertEqual(req, request)
                self.assertEqual(resp, {'a': '1'})
                self.assertEqual(view_inst.__class__, View)
                self.assertEqual(ctx, context)
                return response

            def clone(self):
                return self

        class View:
            def __init__(self, request):
                pass

            def index(self):
                return {'a': '1'}

        result = self.config.derive_view(
            View, renderer=renderer(), attr='index'
        )
        self.assertFalse(result is View)
        self.assertEqual(result.__module__, View.__module__)
        self.assertEqual(result.__doc__, View.__doc__)
        self.assertEqual(result.__name__, View.__name__)
        request = self._makeRequest()
        context = testing.DummyResource()
        self.assertEqual(result(context, request), response)

    def test_as_instance_context_and_request_attr_and_renderer(self):
        response = DummyResponse()

        class renderer:
            def render_view(inself, req, resp, view_inst, ctx):
                self.assertEqual(req, request)
                self.assertEqual(resp, {'a': '1'})
                self.assertEqual(view_inst, view)
                self.assertEqual(ctx, context)
                return response

            def clone(self):
                return self

        class View:
            def index(self, context, request):
                return {'a': '1'}

        view = View()
        result = self.config.derive_view(
            view, renderer=renderer(), attr='index'
        )
        self.assertFalse(result is view)
        self.assertEqual(result.__module__, view.__module__)
        self.assertEqual(result.__doc__, view.__doc__)
        request = self._makeRequest()
        context = testing.DummyResource()
        self.assertEqual(result(context, request), response)

    def test_as_instance_requestonly_attr_and_renderer(self):
        response = DummyResponse()

        class renderer:
            def render_view(inself, req, resp, view_inst, ctx):
                self.assertEqual(req, request)
                self.assertEqual(resp, {'a': '1'})
                self.assertEqual(view_inst, view)
                self.assertEqual(ctx, context)
                return response

            def clone(self):
                return self

        class View:
            def index(self, request):
                return {'a': '1'}

        view = View()
        result = self.config.derive_view(
            view, renderer=renderer(), attr='index'
        )
        self.assertFalse(result is view)
        self.assertEqual(result.__module__, view.__module__)
        self.assertEqual(result.__doc__, view.__doc__)
        request = self._makeRequest()
        context = testing.DummyResource()
        self.assertEqual(result(context, request), response)

    def test_with_view_mapper_config_specified(self):
        response = DummyResponse()

        class mapper:
            def __init__(self, **kw):
                self.kw = kw

            def __call__(self, view):
                def wrapped(context, request):
                    return response

                return wrapped

        def view(context, request):  # pragma: no cover
            return 'NOTOK'

        result = self.config._derive_view(view, mapper=mapper)
        self.assertFalse(result.__wraps__ is view)
        self.assertEqual(result(None, None), response)

    def test_with_view_mapper_view_specified(self):
        from pyramid.response import Response

        response = Response()

        def mapper(**kw):
            def inner(view):
                def superinner(context, request):
                    self.assertEqual(request, None)
                    return response

                return superinner

            return inner

        def view(context, request):  # pragma: no cover
            return 'NOTOK'

        view.__view_mapper__ = mapper
        result = self.config.derive_view(view)
        self.assertFalse(result.__wraps__ is view)
        self.assertEqual(result(None, None), response)

    def test_with_view_mapper_default_mapper_specified(self):
        from pyramid.response import Response

        response = Response()

        def mapper(**kw):
            def inner(view):
                def superinner(context, request):
                    self.assertEqual(request, None)
                    return response

                return superinner

            return inner

        self.config.set_view_mapper(mapper)

        def view(context, request):  # pragma: no cover
            return 'NOTOK'

        result = self.config.derive_view(view)
        self.assertFalse(result.__wraps__ is view)
        self.assertEqual(result(None, None), response)

    def test_attr_wrapped_view_branching_default_phash(self):
        from pyramid.config.predicates import DEFAULT_PHASH

        def view(context, request):  # pragma: no cover
            pass

        result = self.config._derive_view(view, phash=DEFAULT_PHASH)
        self.assertEqual(result.__wraps__, view)

    def test_attr_wrapped_view_branching_nondefault_phash(self):
        def view(context, request):  # pragma: no cover
            pass

        result = self.config._derive_view(view, phash='nondefault')
        self.assertNotEqual(result, view)

    def test_http_cached_view_integer(self):
        import datetime

        from pyramid.response import Response

        response = Response('OK')

        def inner_view(context, request):
            return response

        result = self.config._derive_view(inner_view, http_cache=3600)
        self.assertFalse(result is inner_view)
        self.assertEqual(inner_view.__module__, result.__module__)
        self.assertEqual(inner_view.__doc__, result.__doc__)
        request = self._makeRequest()
        when = datetime.datetime.utcnow() + datetime.timedelta(hours=1)
        result = result(None, request)
        self.assertEqual(result, response)
        headers = dict(result.headerlist)
        expires = parse_httpdate(headers['Expires'])
        assert_similar_datetime(expires, when)
        self.assertEqual(headers['Cache-Control'], 'max-age=3600')

    def test_http_cached_view_timedelta(self):
        import datetime

        from pyramid.response import Response

        response = Response('OK')

        def inner_view(context, request):
            return response

        result = self.config._derive_view(
            inner_view, http_cache=datetime.timedelta(hours=1)
        )
        self.assertFalse(result is inner_view)
        self.assertEqual(inner_view.__module__, result.__module__)
        self.assertEqual(inner_view.__doc__, result.__doc__)
        request = self._makeRequest()
        when = datetime.datetime.utcnow() + datetime.timedelta(hours=1)
        result = result(None, request)
        self.assertEqual(result, response)
        headers = dict(result.headerlist)
        expires = parse_httpdate(headers['Expires'])
        assert_similar_datetime(expires, when)
        self.assertEqual(headers['Cache-Control'], 'max-age=3600')

    def test_http_cached_view_tuple(self):
        import datetime

        from pyramid.response import Response

        response = Response('OK')

        def inner_view(context, request):
            return response

        result = self.config._derive_view(
            inner_view, http_cache=(3600, {'public': True})
        )
        self.assertFalse(result is inner_view)
        self.assertEqual(inner_view.__module__, result.__module__)
        self.assertEqual(inner_view.__doc__, result.__doc__)
        request = self._makeRequest()
        when = datetime.datetime.utcnow() + datetime.timedelta(hours=1)
        result = result(None, request)
        self.assertEqual(result, response)
        headers = dict(result.headerlist)
        expires = parse_httpdate(headers['Expires'])
        assert_similar_datetime(expires, when)
        self.assertEqual(headers['Cache-Control'], 'max-age=3600, public')

    def test_http_cached_view_tuple_seconds_None(self):
        from pyramid.response import Response

        response = Response('OK')

        def inner_view(context, request):
            return response

        result = self.config._derive_view(
            inner_view, http_cache=(None, {'public': True})
        )
        self.assertFalse(result is inner_view)
        self.assertEqual(inner_view.__module__, result.__module__)
        self.assertEqual(inner_view.__doc__, result.__doc__)
        request = self._makeRequest()
        result = result(None, request)
        self.assertEqual(result, response)
        headers = dict(result.headerlist)
        self.assertFalse('Expires' in headers)
        self.assertEqual(headers['Cache-Control'], 'public')

    def test_http_cached_view_prevent_auto_set(self):
        from pyramid.response import Response

        response = Response()
        response.cache_control.prevent_auto = True

        def inner_view(context, request):
            return response

        result = self.config._derive_view(inner_view, http_cache=3600)
        request = self._makeRequest()
        result = result(None, request)
        self.assertEqual(result, response)  # doesn't blow up
        headers = dict(result.headerlist)
        self.assertFalse('Expires' in headers)
        self.assertFalse('Cache-Control' in headers)

    def test_http_cached_prevent_http_cache_in_settings(self):
        self.config.registry.settings['prevent_http_cache'] = True
        from pyramid.response import Response

        response = Response()

        def inner_view(context, request):
            return response

        result = self.config._derive_view(inner_view, http_cache=3600)
        request = self._makeRequest()
        result = result(None, request)
        self.assertEqual(result, response)
        headers = dict(result.headerlist)
        self.assertFalse('Expires' in headers)
        self.assertFalse('Cache-Control' in headers)

    def test_http_cached_view_bad_tuple(self):
        def view(request):  # pragma: no cover
            pass

        self.assertRaises(
            ConfigurationError,
            self.config._derive_view,
            view,
            http_cache=(None,),
        )

    def test_csrf_view_ignores_GET(self):
        response = DummyResponse()

        def inner_view(request):
            return response

        request = self._makeRequest()
        request.method = 'GET'
        view = self.config._derive_view(inner_view, require_csrf=True)
        result = view(None, request)
        self.assertTrue(result is response)

    def test_csrf_view_fails_with_bad_POST_header(self):
        from pyramid.exceptions import BadCSRFToken

        def inner_view(request):  # pragma: no cover
            pass

        request = self._makeRequest()
        request.scheme = "http"
        request.method = 'POST'
        request.session = DummySession({'csrf_token': 'foo'})
        request.headers = {'X-CSRF-Token': 'bar'}
        view = self.config._derive_view(inner_view, require_csrf=True)
        self.assertRaises(BadCSRFToken, lambda: view(None, request))

    def test_csrf_view_passes_with_good_POST_header(self):
        response = DummyResponse()

        def inner_view(request):
            return response

        request = self._makeRequest()
        request.scheme = "http"
        request.method = 'POST'
        request.session = DummySession({'csrf_token': 'foo'})
        request.headers = {'X-CSRF-Token': 'foo'}
        view = self.config._derive_view(inner_view, require_csrf=True)
        result = view(None, request)
        self.assertTrue(result is response)

    def test_csrf_view_fails_with_bad_POST_token(self):
        from pyramid.exceptions import BadCSRFToken

        def inner_view(request):  # pragma: no cover
            pass

        request = self._makeRequest()
        request.scheme = "http"
        request.method = 'POST'
        request.session = DummySession({'csrf_token': 'foo'})
        request.POST = {'csrf_token': 'bar'}
        view = self.config._derive_view(inner_view, require_csrf=True)
        self.assertRaises(BadCSRFToken, lambda: view(None, request))

    def test_csrf_view_passes_with_good_POST_token(self):
        response = DummyResponse()

        def inner_view(request):
            return response

        request = self._makeRequest()
        request.scheme = "http"
        request.method = 'POST'
        request.session = DummySession({'csrf_token': 'foo'})
        request.POST = {'csrf_token': 'foo'}
        view = self.config._derive_view(inner_view, require_csrf=True)
        result = view(None, request)
        self.assertTrue(result is response)

    def test_csrf_view_https_domain(self):
        response = DummyResponse()

        def inner_view(request):
            return response

        request = self._makeRequest()
        request.scheme = "https"
        request.domain = "example.com"
        request.host_port = "443"
        request.referrer = "https://example.com/login/"
        request.method = 'POST'
        request.session = DummySession({'csrf_token': 'foo'})
        request.POST = {'csrf_token': 'foo'}
        view = self.config._derive_view(inner_view, require_csrf=True)
        result = view(None, request)
        self.assertTrue(result is response)

    def test_csrf_view_disables_origin_check(self):
        response = DummyResponse()

        def inner_view(request):
            return response

        self.config.set_default_csrf_options(
            require_csrf=True, check_origin=False
        )
        request = self._makeRequest()
        request.scheme = "https"
        request.domain = "example.com"
        request.host_port = "443"
        request.referrer = None
        request.method = 'POST'
        request.headers = {"Origin": "https://evil-example.com"}
        request.session = DummySession({'csrf_token': 'foo'})
        request.POST = {'csrf_token': 'foo'}
        view = self.config._derive_view(inner_view, require_csrf=True)
        result = view(None, request)
        self.assertTrue(result is response)

    def test_csrf_view_allow_no_origin(self):
        response = DummyResponse()

        def inner_view(request):
            return response

        self.config.set_default_csrf_options(
            require_csrf=True, allow_no_origin=True
        )
        request = self._makeRequest()
        request.scheme = "https"
        request.domain = "example.com"
        request.host_port = "443"
        request.referrer = None
        request.method = 'POST'
        request.session = DummySession({'csrf_token': 'foo'})
        request.POST = {'csrf_token': 'foo'}
        view = self.config._derive_view(inner_view, require_csrf=True)
        result = view(None, request)
        self.assertTrue(result is response)

    def test_csrf_view_fails_on_bad_PUT_header(self):
        from pyramid.exceptions import BadCSRFToken

        def inner_view(request):  # pragma: no cover
            pass

        request = self._makeRequest()
        request.scheme = "http"
        request.method = 'PUT'
        request.session = DummySession({'csrf_token': 'foo'})
        request.headers = {'X-CSRF-Token': 'bar'}
        view = self.config._derive_view(inner_view, require_csrf=True)
        self.assertRaises(BadCSRFToken, lambda: view(None, request))

    def test_csrf_view_fails_on_bad_referrer(self):
        from pyramid.exceptions import BadCSRFOrigin

        def inner_view(request):  # pragma: no cover
            pass

        request = self._makeRequest()
        request.method = "POST"
        request.scheme = "https"
        request.host_port = "443"
        request.domain = "example.com"
        request.referrer = "https://not-example.com/evil/"
        request.registry.settings = {}
        view = self.config._derive_view(inner_view, require_csrf=True)
        self.assertRaises(BadCSRFOrigin, lambda: view(None, request))

    def test_csrf_view_fails_on_bad_origin(self):
        from pyramid.exceptions import BadCSRFOrigin

        def inner_view(request):  # pragma: no cover
            pass

        request = self._makeRequest()
        request.method = "POST"
        request.scheme = "https"
        request.host_port = "443"
        request.domain = "example.com"
        request.headers = {"Origin": "https://not-example.com/evil/"}
        request.registry.settings = {}
        view = self.config._derive_view(inner_view, require_csrf=True)
        self.assertRaises(BadCSRFOrigin, lambda: view(None, request))

    def test_csrf_view_enabled_by_default(self):
        from pyramid.exceptions import BadCSRFToken

        def inner_view(request):  # pragma: no cover
            pass

        request = self._makeRequest()
        request.scheme = "http"
        request.method = 'POST'
        request.session = DummySession({'csrf_token': 'foo'})
        self.config.set_default_csrf_options(require_csrf=True)
        view = self.config._derive_view(inner_view)
        self.assertRaises(BadCSRFToken, lambda: view(None, request))

    def test_csrf_view_enabled_via_callback(self):
        def callback(request):
            return True

        from pyramid.exceptions import BadCSRFToken

        def inner_view(request):  # pragma: no cover
            pass

        request = self._makeRequest()
        request.scheme = "http"
        request.method = 'POST'
        request.session = DummySession({'csrf_token': 'foo'})
        self.config.set_default_csrf_options(
            require_csrf=True, callback=callback
        )
        view = self.config._derive_view(inner_view)
        self.assertRaises(BadCSRFToken, lambda: view(None, request))

    def test_csrf_view_disabled_via_callback(self):
        def callback(request):
            return False

        response = DummyResponse()

        def inner_view(request):
            return response

        request = self._makeRequest()
        request.scheme = "http"
        request.method = 'POST'
        request.session = DummySession({'csrf_token': 'foo'})
        self.config.set_default_csrf_options(
            require_csrf=True, callback=callback
        )
        view = self.config._derive_view(inner_view)
        result = view(None, request)
        self.assertTrue(result is response)

    def test_csrf_view_uses_custom_csrf_token(self):
        response = DummyResponse()

        def inner_view(request):
            return response

        request = self._makeRequest()
        request.scheme = "http"
        request.method = 'POST'
        request.session = DummySession({'csrf_token': 'foo'})
        request.POST = {'DUMMY': 'foo'}
        self.config.set_default_csrf_options(require_csrf=True, token='DUMMY')
        view = self.config._derive_view(inner_view)
        result = view(None, request)
        self.assertTrue(result is response)

    def test_csrf_view_uses_custom_csrf_header(self):
        response = DummyResponse()

        def inner_view(request):
            return response

        request = self._makeRequest()
        request.scheme = "http"
        request.method = 'POST'
        request.session = DummySession({'csrf_token': 'foo'})
        request.headers = {'DUMMY': 'foo'}
        self.config.set_default_csrf_options(require_csrf=True, header='DUMMY')
        view = self.config._derive_view(inner_view)
        result = view(None, request)
        self.assertTrue(result is response)

    def test_csrf_view_uses_custom_methods(self):
        response = DummyResponse()

        def inner_view(request):
            return response

        request = self._makeRequest()
        request.scheme = "http"
        request.method = 'PUT'
        request.session = DummySession({'csrf_token': 'foo'})
        self.config.set_default_csrf_options(
            require_csrf=True, safe_methods=['PUT']
        )
        view = self.config._derive_view(inner_view)
        result = view(None, request)
        self.assertTrue(result is response)

    def test_csrf_view_uses_view_option_override(self):
        response = DummyResponse()

        def inner_view(request):
            return response

        request = self._makeRequest()
        request.scheme = "http"
        request.method = 'POST'
        request.session = DummySession({'csrf_token': 'foo'})
        request.POST = {'csrf_token': 'bar'}
        self.config.set_default_csrf_options(require_csrf=True)
        view = self.config._derive_view(inner_view, require_csrf=False)
        result = view(None, request)
        self.assertTrue(result is response)

    def test_csrf_view_skipped_by_default_on_exception_view(self):
        from pyramid.request import Request

        def view(request):
            raise ValueError

        def excview(request):
            return 'hello'

        self.config.set_default_csrf_options(require_csrf=True)
        self.config.set_session_factory(
            lambda request: DummySession({'csrf_token': 'foo'})
        )
        self.config.add_view(view, name='foo', require_csrf=False)
        self.config.add_view(excview, context=ValueError, renderer='string')
        app = self.config.make_wsgi_app()
        request = Request.blank('/foo', base_url='http://example.com')
        request.method = 'POST'
        response = request.get_response(app)
        self.assertTrue(b'hello' in response.body)

    def test_csrf_view_failed_on_explicit_exception_view(self):
        from pyramid.exceptions import BadCSRFToken
        from pyramid.request import Request

        def view(request):
            raise ValueError

        def excview(request):  # pragma: no cover
            pass

        self.config.set_default_csrf_options(require_csrf=True)
        self.config.set_session_factory(
            lambda request: DummySession({'csrf_token': 'foo'})
        )
        self.config.add_view(view, name='foo', require_csrf=False)
        self.config.add_view(
            excview, context=ValueError, renderer='string', require_csrf=True
        )
        app = self.config.make_wsgi_app()
        request = Request.blank('/foo', base_url='http://example.com')
        request.method = 'POST'
        try:
            request.get_response(app)
        except BadCSRFToken:
            pass
        else:  # pragma: no cover
            raise AssertionError

    def test_csrf_view_passed_on_explicit_exception_view(self):
        from pyramid.request import Request

        def view(request):
            raise ValueError

        def excview(request):
            return 'hello'

        self.config.set_default_csrf_options(require_csrf=True)
        self.config.set_session_factory(
            lambda request: DummySession({'csrf_token': 'foo'})
        )
        self.config.add_view(view, name='foo', require_csrf=False)
        self.config.add_view(
            excview, context=ValueError, renderer='string', require_csrf=True
        )
        app = self.config.make_wsgi_app()
        request = Request.blank('/foo', base_url='http://example.com')
        request.method = 'POST'
        request.headers['X-CSRF-Token'] = 'foo'
        response = request.get_response(app)
        self.assertTrue(b'hello' in response.body)


class TestDerivationOrder(unittest.TestCase):
    def setUp(self):
        self.config = testing.setUp()

    def tearDown(self):
        self.config = None
        testing.tearDown()

    def test_right_order_user_sorted(self):
        from pyramid.interfaces import IViewDerivers

        self.config.add_view_deriver(None, 'deriv1')
        self.config.add_view_deriver(
            None, 'deriv2', 'decorated_view', 'deriv1'
        )
        self.config.add_view_deriver(None, 'deriv3', 'deriv2', 'deriv1')

        derivers = self.config.registry.getUtility(IViewDerivers)
        derivers_sorted = derivers.sorted()
        dlist = [d for (d, _) in derivers_sorted]
        self.assertEqual(
            [
                'secured_view',
                'csrf_view',
                'owrapped_view',
                'http_cached_view',
                'decorated_view',
                'deriv2',
                'deriv3',
                'deriv1',
                'rendered_view',
                'mapped_view',
            ],
            dlist,
        )

    def test_right_order_implicit(self):
        from pyramid.interfaces import IViewDerivers

        self.config.add_view_deriver(None, 'deriv1')
        self.config.add_view_deriver(None, 'deriv2')
        self.config.add_view_deriver(None, 'deriv3')

        derivers = self.config.registry.getUtility(IViewDerivers)
        derivers_sorted = derivers.sorted()
        dlist = [d for (d, _) in derivers_sorted]
        self.assertEqual(
            [
                'secured_view',
                'csrf_view',
                'owrapped_view',
                'http_cached_view',
                'decorated_view',
                'deriv3',
                'deriv2',
                'deriv1',
                'rendered_view',
                'mapped_view',
            ],
            dlist,
        )

    def test_right_order_under_rendered_view(self):
        from pyramid.interfaces import IViewDerivers

        self.config.add_view_deriver(
            None, 'deriv1', 'rendered_view', 'mapped_view'
        )

        derivers = self.config.registry.getUtility(IViewDerivers)
        derivers_sorted = derivers.sorted()
        dlist = [d for (d, _) in derivers_sorted]
        self.assertEqual(
            [
                'secured_view',
                'csrf_view',
                'owrapped_view',
                'http_cached_view',
                'decorated_view',
                'rendered_view',
                'deriv1',
                'mapped_view',
            ],
            dlist,
        )

    def test_right_order_under_rendered_view_others(self):
        from pyramid.interfaces import IViewDerivers

        self.config.add_view_deriver(
            None, 'deriv1', 'rendered_view', 'mapped_view'
        )
        self.config.add_view_deriver(None, 'deriv2')
        self.config.add_view_deriver(None, 'deriv3')

        derivers = self.config.registry.getUtility(IViewDerivers)
        derivers_sorted = derivers.sorted()
        dlist = [d for (d, _) in derivers_sorted]
        self.assertEqual(
            [
                'secured_view',
                'csrf_view',
                'owrapped_view',
                'http_cached_view',
                'decorated_view',
                'deriv3',
                'deriv2',
                'rendered_view',
                'deriv1',
                'mapped_view',
            ],
            dlist,
        )


class TestAddDeriver(unittest.TestCase):
    def setUp(self):
        self.config = testing.setUp()

    def tearDown(self):
        self.config = None
        testing.tearDown()

    def test_add_single_deriver(self):
        response = DummyResponse()
        response.deriv = False
        view = lambda *arg: response

        def deriv(view, info):
            self.assertFalse(response.deriv)
            response.deriv = True
            return view

        result = self.config._derive_view(view)
        self.assertFalse(response.deriv)
        self.config.add_view_deriver(deriv, 'test_deriv')

        result = self.config._derive_view(view)  # noqa: F841
        self.assertTrue(response.deriv)

    def test_override_deriver(self):
        flags = {}

        class AView:
            def __init__(self):
                self.response = DummyResponse()

        def deriv1(view, info):
            flags['deriv1'] = True
            return view

        def deriv2(view, info):
            flags['deriv2'] = True
            return view

        view1 = AView()
        self.config.add_view_deriver(deriv1, 'test_deriv')
        result = self.config._derive_view(view1)
        self.assertTrue(flags.get('deriv1'))
        self.assertFalse(flags.get('deriv2'))

        flags.clear()
        view2 = AView()
        self.config.add_view_deriver(deriv2, 'test_deriv')
        result = self.config._derive_view(view2)  # noqa: F841
        self.assertFalse(flags.get('deriv1'))
        self.assertTrue(flags.get('deriv2'))

    def test_override_mapped_view(self):
        from pyramid.viewderivers import VIEW

        response = DummyResponse()
        view = lambda *arg: response
        flags = {}

        def deriv1(view, info):
            flags['deriv1'] = True
            return view

        result = self.config._derive_view(view)
        self.assertFalse(flags.get('deriv1'))

        flags.clear()
        self.config.add_view_deriver(
            deriv1, name='mapped_view', under='rendered_view', over=VIEW
        )
        result = self.config._derive_view(view)  # noqa: F841
        self.assertTrue(flags.get('deriv1'))

    def test_add_multi_derivers_ordered(self):
        from pyramid.viewderivers import INGRESS

        response = DummyResponse()
        view = lambda *arg: response
        response.deriv = []

        def deriv1(view, info):
            response.deriv.append('deriv1')
            return view

        def deriv2(view, info):
            response.deriv.append('deriv2')
            return view

        def deriv3(view, info):
            response.deriv.append('deriv3')
            return view

        self.config.add_view_deriver(deriv1, 'deriv1')
        self.config.add_view_deriver(deriv2, 'deriv2', INGRESS, 'deriv1')
        self.config.add_view_deriver(deriv3, 'deriv3', 'deriv2', 'deriv1')
        result = self.config._derive_view(view)  # noqa: F841
        self.assertEqual(response.deriv, ['deriv1', 'deriv3', 'deriv2'])

    def test_add_deriver_without_name(self):
        from pyramid.interfaces import IViewDerivers

        def deriv1(view, info):  # pragma: no cover
            pass

        self.config.add_view_deriver(deriv1)
        derivers = self.config.registry.getUtility(IViewDerivers)
        self.assertTrue('deriv1' in derivers.names)

    def test_add_deriver_reserves_ingress(self):
        from pyramid.exceptions import ConfigurationError
        from pyramid.viewderivers import INGRESS

        def deriv1(view, info):  # pragma: no cover
            pass

        self.assertRaises(
            ConfigurationError, self.config.add_view_deriver, deriv1, INGRESS
        )

    def test_add_deriver_enforces_ingress_is_first(self):
        from pyramid.exceptions import ConfigurationError
        from pyramid.viewderivers import INGRESS

        def deriv1(view, info):  # pragma: no cover
            pass

        try:
            self.config.add_view_deriver(deriv1, over=INGRESS)
        except ConfigurationError as ex:
            self.assertTrue('cannot be over INGRESS' in ex.args[0])
        else:  # pragma: no cover
            raise AssertionError

    def test_add_deriver_enforces_view_is_last(self):
        from pyramid.exceptions import ConfigurationError
        from pyramid.viewderivers import VIEW

        def deriv1(view, info):  # pragma: no cover
            pass

        try:
            self.config.add_view_deriver(deriv1, under=VIEW)
        except ConfigurationError as ex:
            self.assertTrue('cannot be under VIEW' in ex.args[0])
        else:  # pragma: no cover
            raise AssertionError

    def test_add_deriver_enforces_mapped_view_is_last(self):
        from pyramid.exceptions import ConfigurationError

        def deriv1(view, info):  # pragma: no cover
            pass

        try:
            self.config.add_view_deriver(deriv1, 'deriv1', under='mapped_view')
        except ConfigurationError as ex:
            self.assertTrue('cannot be under "mapped_view"' in ex.args[0])
        else:  # pragma: no cover
            raise AssertionError


class TestDeriverIntegration(unittest.TestCase):
    def setUp(self):
        self.config = testing.setUp()

    def tearDown(self):
        self.config = None
        testing.tearDown()

    def _getViewCallable(
        self, config, ctx_iface=None, request_iface=None, name=''
    ):
        from zope.interface import Interface

        from pyramid.interfaces import IRequest, IView, IViewClassifier

        classifier = IViewClassifier
        if ctx_iface is None:
            ctx_iface = Interface
        if request_iface is None:
            request_iface = IRequest
        return config.registry.adapters.lookup(
            (classifier, request_iface, ctx_iface),
            IView,
            name=name,
            default=None,
        )

    def _makeRequest(self, config):
        request = DummyRequest()
        request.registry = config.registry
        return request

    def test_view_options(self):
        response = DummyResponse()
        view = lambda *arg: response
        response.deriv = []

        def deriv1(view, info):
            response.deriv.append(info.options['deriv1'])
            return view

        deriv1.options = ('deriv1',)

        def deriv2(view, info):
            response.deriv.append(info.options['deriv2'])
            return view

        deriv2.options = ('deriv2',)

        self.config.add_view_deriver(deriv1, 'deriv1')
        self.config.add_view_deriver(deriv2, 'deriv2')
        self.config.add_view(view, deriv1='test1', deriv2='test2')

        wrapper = self._getViewCallable(self.config)
        request = self._makeRequest(self.config)
        request.method = 'GET'
        self.assertEqual(wrapper(None, request), response)
        self.assertEqual(['test1', 'test2'], response.deriv)

    def test_unexpected_view_options(self):
        from pyramid.exceptions import ConfigurationError

        def deriv1(view, info):  # pragma: no cover
            pass

        self.config.add_view_deriver(deriv1, 'deriv1')
        self.assertRaises(
            ConfigurationError,
            lambda: self.config.add_view(lambda r: {}, deriv1='test1'),
        )


@implementer(IResponse)
class DummyResponse:
    content_type = None
    default_content_type = None
    body = None


class DummyRequest:
    subpath = ()
    matchdict = None
    request_iface = IRequest

    def __init__(self, environ=None):
        if environ is None:
            environ = {}
        self.environ = environ
        self.params = {}
        self.POST = {}
        self.cookies = {}
        self.headers = {}
        self.response = DummyResponse()


class DummyLogger:
    def __init__(self):
        self.messages = []

    def info(self, msg):
        self.messages.append(msg)

    warn = info
    debug = info


class DummySecurityPolicy:
    def __init__(self, permitted=True):
        self.permitted = permitted

    def permits(self, request, context, permission):
        return self.permitted


class DummySession(dict):
    def get_csrf_token(self):
        return self['csrf_token']


def parse_httpdate(s):
    import datetime

    # cannot use %Z, must use literal GMT; Jython honors timezone
    # but CPython does not
    return datetime.datetime.strptime(s, "%a, %d %b %Y %H:%M:%S GMT")


def assert_similar_datetime(one, two):
    for attr in ('year', 'month', 'day', 'hour', 'minute'):
        one_attr = getattr(one, attr)
        two_attr = getattr(two, attr)
        if not one_attr == two_attr:  # pragma: no cover
            raise AssertionError('%r != %r in %s' % (one_attr, two_attr, attr))