arc-web 0.2.3

Arc framework runtime: Actix/Tera web machinery, event-sourcing wiring, and the application builder seam.
Documentation 
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use crate::helpers::session::is_authenticated;
use actix_session::SessionExt;
use actix_web::body::EitherBody;
use actix_web::{
    dev::{forward_ready, Service, ServiceRequest, ServiceResponse, Transform},
    Error, HttpResponse,
};
use futures_util::future::LocalBoxFuture;
use std::future::{ready, Ready};

/// Session-based authentication middleware. Redirects unauthenticated requests to `/signin`.
/// Checks for cached user data in the session to avoid database queries on every request.
pub struct AuthMiddleware;

impl<S, B> Transform<S, ServiceRequest> for AuthMiddleware
where
    S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error>,
    S::Future: 'static,
    B: 'static,
{
    type Response = ServiceResponse<EitherBody<B>>;
    type Error = Error;
    type InitError = ();
    type Transform = AuthCheck<S>;
    type Future = Ready<Result<Self::Transform, Self::InitError>>;

    fn new_transform(&self, service: S) -> Self::Future {
        ready(Ok(AuthCheck { service }))
    }
}

/// Inner service wrapper created by [`AuthMiddleware`].
pub struct AuthCheck<S> {
    service: S,
}

impl<S, B> Service<ServiceRequest> for AuthCheck<S>
where
    S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error>,
    S::Future: 'static,
    B: 'static,
{
    type Response = ServiceResponse<EitherBody<B>>;
    type Error = Error;
    type Future = LocalBoxFuture<'static, Result<Self::Response, Self::Error>>;

    forward_ready!(service);

    fn call(&self, req: ServiceRequest) -> Self::Future {
        let session = req.get_session();

        // Use cached session check (no DB query if user_data exists in session)
        if !is_authenticated(&session) {
            return Box::pin(async move {
                Ok(req.into_response(
                    HttpResponse::Found()
                        .insert_header(("Location", "/signin"))
                        .finish()
                        .map_into_right_body(),
                ))
            });
        }

        let res: <S as Service<ServiceRequest>>::Future = self.service.call(req);
        Box::pin(async move { res.await.map(ServiceResponse::map_into_left_body) })
    }
}