2017-09-19 08:54:37 +00:00
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import functools
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from textwrap import dedent
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from aiohttp import web
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from aiohttp_security import remember, forget, authorized_userid, permits
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from .authz import check_credentials
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def require(permission):
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def wrapper(f):
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@functools.wraps(f)
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2017-12-13 14:51:46 +00:00
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async def wrapped(request):
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has_perm = await permits(request, permission)
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2017-09-19 08:54:37 +00:00
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if not has_perm:
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message = 'User has no permission {}'.format(permission)
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raise web.HTTPForbidden(body=message.encode())
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2017-12-13 14:51:46 +00:00
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return await f(request)
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2017-09-19 08:54:37 +00:00
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return wrapped
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return wrapper
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index_template = dedent("""
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<!doctype html>
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<head>
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</head>
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<body>
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<p>{message}</p>
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<form action="/login" method="post">
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Login:
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<input type="text" name="username">
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Password:
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<input type="password" name="password">
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<input type="submit" value="Login">
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</form>
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<a href="/logout">Logout</a>
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</body>
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""")
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async def index(request):
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username = await authorized_userid(request)
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if username:
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template = index_template.format(
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message='Hello, {username}!'.format(username=username))
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else:
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template = index_template.format(message='You need to login')
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return web.Response(
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text=template,
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content_type='text/html',
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)
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async def login(request):
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response = web.HTTPFound('/')
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form = await request.post()
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username = form.get('username')
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password = form.get('password')
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verified = await check_credentials(request.app.user_map, username, password)
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if verified:
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await remember(request, response, username)
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return response
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return web.HTTPUnauthorized(body='Invalid username / password combination')
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@require('public')
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async def logout(request):
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response = web.Response(
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text='You have been logged out',
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content_type='text/html',
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)
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await forget(request, response)
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return response
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@require('public')
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async def internal_page(request):
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# pylint: disable=unused-argument
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response = web.Response(
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text='This page is visible for all registered users',
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content_type='text/html',
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)
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return response
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@require('protected')
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async def protected_page(request):
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# pylint: disable=unused-argument
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response = web.Response(
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text='You are on protected page',
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content_type='text/html',
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)
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return response
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def configure_handlers(app):
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router = app.router
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router.add_get('/', index, name='index')
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router.add_post('/login', login, name='login')
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router.add_get('/logout', logout, name='logout')
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router.add_get('/public', internal_page, name='public')
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router.add_get('/protected', protected_page, name='protected')
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