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import asyncio
import base64
import json
import time
from typing import Any, Dict, MutableMapping, Tuple, Union, cast
import pytest
from aiohttp import web
from aiohttp.test_utils import TestClient
from aiohttp.typedefs import Handler
from cryptography.fernet import Fernet
from aiohttp_session import (
Session,
get_session,
new_session,
session_middleware,
)
from aiohttp_session.cookie_storage import EncryptedCookieStorage
from .typedefs import AiohttpClient
MAX_AGE = 1
def make_cookie(client: TestClient, fernet: Fernet, data: Dict[str, Any]) -> None:
session_data = {"session": data, "created": int(time.time())}
cookie_data = json.dumps(session_data).encode("utf-8")
encrypted_data = fernet.encrypt(cookie_data).decode("utf-8")
client.session.cookie_jar.update_cookies({"AIOHTTP_SESSION": encrypted_data})
def create_app(
handler: Handler, key: Union[str, bytes, bytearray, Fernet]
) -> web.Application:
middleware = session_middleware(EncryptedCookieStorage(key))
app = web.Application(middlewares=[middleware])
app.router.add_route("GET", "/", handler)
return app
def decrypt(fernet: Fernet, cookie_value: str) -> Dict[str, Any]:
assert type(cookie_value) == str
cookie_value = fernet.decrypt(cookie_value.encode("utf-8")).decode("utf-8")
return cast(Dict[str, Any], json.loads(cookie_value))
@pytest.fixture
def fernet_and_key() -> Tuple[Fernet, bytes]:
key = Fernet.generate_key()
fernet = Fernet(key)
return fernet, base64.urlsafe_b64decode(key)
@pytest.fixture
def fernet(fernet_and_key: Tuple[Fernet, bytes]) -> Fernet:
return fernet_and_key[0]
@pytest.fixture
def key(fernet_and_key: Tuple[Fernet, bytes]) -> bytes:
return fernet_and_key[1]
def test_invalid_key() -> None:
with pytest.raises(ValueError):
EncryptedCookieStorage(b"123") # short key
def test_str_key() -> None:
k = Fernet.generate_key().decode("utf-8")
assert EncryptedCookieStorage(k)
async def test_create_new_session_broken_by_format(
aiohttp_client: AiohttpClient, fernet: Fernet, key: bytes
) -> None:
async def handler(request: web.Request) -> web.StreamResponse:
session = await get_session(request)
assert isinstance(session, Session)
assert session.new
assert not session._changed
assert cast(MutableMapping[str, Any], {}) == session
return web.Response(body=b"OK")
new_fernet = Fernet(Fernet.generate_key())
client = await aiohttp_client(create_app(handler, key))
make_cookie(client, new_fernet, {"a": 1, "b": 12})
resp = await client.get("/")
assert resp.status == 200
async def test_load_existing_session(
aiohttp_client: AiohttpClient, fernet: Fernet, key: bytes
) -> None:
async def handler(request: web.Request) -> web.StreamResponse:
session = await get_session(request)
assert isinstance(session, Session)
assert not session.new
assert not session._changed
assert cast(MutableMapping[str, Any], {"a": 1, "b": 12}) == session
return web.Response(body=b"OK")
client = await aiohttp_client(create_app(handler, key))
make_cookie(client, fernet, {"a": 1, "b": 12})
resp = await client.get("/")
assert resp.status == 200
async def test_load_existing_session_with_fernet(
aiohttp_client: AiohttpClient, fernet: Fernet
) -> None:
async def handler(request: web.Request) -> web.StreamResponse:
session = await get_session(request)
assert isinstance(session, Session)
assert not session.new
assert not session._changed
assert {"a": 1, "b": 12} == session
return web.Response(body=b"OK")
client = await aiohttp_client(create_app(handler, fernet))
make_cookie(client, fernet, {"a": 1, "b": 12})
resp = await client.get("/")
assert resp.status == 200
async def test_change_session(
aiohttp_client: AiohttpClient, fernet: Fernet, key: bytes
) -> None:
async def handler(request: web.Request) -> web.StreamResponse:
session = await get_session(request)
session["c"] = 3
return web.Response(body=b"OK")
client = await aiohttp_client(create_app(handler, key))
make_cookie(client, fernet, {"a": 1, "b": 2})
resp = await client.get("/")
assert resp.status == 200
morsel = resp.cookies["AIOHTTP_SESSION"]
cookie_data = decrypt(fernet, morsel.value)
assert "session" in cookie_data
assert "a" in cookie_data["session"]
assert "b" in cookie_data["session"]
assert "c" in cookie_data["session"]
assert "created" in cookie_data
assert cookie_data["session"]["a"] == 1
assert cookie_data["session"]["b"] == 2
assert cookie_data["session"]["c"] == 3
assert morsel["httponly"]
assert "/" == morsel["path"]
async def test_clear_cookie_on_session_invalidation(
aiohttp_client: AiohttpClient, fernet: Fernet, key: bytes
) -> None:
async def handler(request: web.Request) -> web.StreamResponse:
session = await get_session(request)
session.invalidate()
return web.Response(body=b"OK")
client = await aiohttp_client(create_app(handler, key))
make_cookie(client, fernet, {"a": 1, "b": 2})
resp = await client.get("/")
assert resp.status == 200
morsel = resp.cookies["AIOHTTP_SESSION"]
assert "" == morsel.value
assert not morsel["httponly"]
assert morsel["path"] == "/"
async def test_encrypted_cookie_session_fixation(
aiohttp_client: AiohttpClient, fernet: Fernet, key: bytes
) -> None:
async def login(request: web.Request) -> web.StreamResponse:
session = await get_session(request)
session["k"] = "v"
return web.Response()
async def logout(request: web.Request) -> web.StreamResponse:
session = await get_session(request)
session.invalidate()
return web.Response()
app = create_app(login, key)
app.router.add_route("DELETE", "/", logout)
client = await aiohttp_client(app)
resp = await client.get("/")
assert "AIOHTTP_SESSION" in resp.cookies
evil_cookie = resp.cookies["AIOHTTP_SESSION"].value
resp = await client.delete("/")
assert resp.cookies["AIOHTTP_SESSION"].value == ""
client.session.cookie_jar.update_cookies({"AIOHTTP_SESSION": evil_cookie})
resp = await client.get("/")
assert resp.cookies["AIOHTTP_SESSION"].value != evil_cookie
async def test_fernet_ttl(
aiohttp_client: AiohttpClient, fernet: Fernet, key: bytes
) -> None:
async def login(request: web.Request) -> web.StreamResponse:
session = await new_session(request)
session["created"] = int(time.time())
return web.Response()
async def handler(request: web.Request) -> web.StreamResponse:
session = await get_session(request)
created = session["created"] if not session.new else ""
return web.Response(text=str(created))
middleware = session_middleware(EncryptedCookieStorage(key, max_age=MAX_AGE))
app = web.Application(middlewares=[middleware])
app.router.add_route("POST", "/", login)
app.router.add_route("GET", "/", handler)
client = await aiohttp_client(app)
resp = await client.post("/")
assert "AIOHTTP_SESSION" in resp.cookies
cookie = resp.cookies["AIOHTTP_SESSION"].value
await asyncio.sleep(MAX_AGE + 1)
client.session.cookie_jar.update_cookies({"AIOHTTP_SESSION": cookie})
resp = await client.get("/")
assert await resp.text() == ""
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