from textwrap import dedent
from typing import NoReturn
from aiohttp import web
from aiohttp_security import (
remember, forget, authorized_userid,
check_permission, check_authorized,
)
from .db_auth import check_credentials
class Web(object):
index_template = dedent("""
<!doctype html>
<head></head>
<body>
<p>{message}</p>
<form action="/login" method="post">
Login:
<input type="text" name="login">
Password:
<input type="password" name="password">
<input type="submit" value="Login">
</form>
<a href="/logout">Logout</a>
</body>
""")
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')