{message}
Logout """) async def index(self, request: web.Request) -> web.Response: username = await authorized_userid(request) if username: template = self.index_template.format( message='Hello, {username}!'.format(username=username)) else: template = self.index_template.format(message='You need to login') response = web.Response(body=template.encode()) return response async def login(self, request: web.Request) -> NoReturn: invalid_resp = web.HTTPUnauthorized(body=b'Invalid username/password combination') form = await request.post() login = form.get('login') password = form.get('password') db_engine = request.app['db_engine'] if not (isinstance(login, str) and isinstance(password, str)): raise invalid_resp if await check_credentials(db_engine, login, password): response = web.HTTPFound('/') await remember(request, response, login) raise response raise invalid_resp async def logout(self, request: web.Request) -> web.Response: await check_authorized(request) response = web.Response(body=b'You have been logged out') await forget(request, response) return response async def internal_page(self, request: web.Request) -> web.Response: await check_permission(request, 'public') response = web.Response( body=b'This page is visible for all registered users') return response async def protected_page(self, request: web.Request) -> web.Response: await check_permission(request, 'protected') response = web.Response(body=b'You are on protected page') return response def configure(self, app: web.Application) -> None: router = app.router router.add_route('GET', '/', self.index, name='index') router.add_route('POST', '/login', self.login, name='login') router.add_route('GET', '/logout', self.logout, name='logout') router.add_route('GET', '/public', self.internal_page, name='public') router.add_route('GET', '/protected', self.protected_page, name='protected')