Use Decorator

To append common routines to views, you can make your own decorator.

Simple decorator example

This is an example to implement your login_required decorator.

def login_required(f):
    async def inner(view, req: Request, resp: Response):
        auth = use_component(AuthComp)
        token = req.headers["authorization"]
        user = await auth.get_user(token)
        if not user:
            raise AuthError("Need to login.")
        req.state.user = user
        return await f(view, req, resp)
    return inner

# usage

@api.route("/secrets")
class Secret:
    @login_required
    async def on_request(self, req, resp):
        assert req.state.user

    async def on_post(self, req, resp):
        # login required for all methods.
        assert req.state.user