Get Extracted Data in Middleware

[amitnos123]

Summary

My route

pub fn get_router() -> Router<AppState> {
    let router: Router<AppState> = Router::new()
    .route(....)
    .route_layer(middleware::from_fn(process_claims))
    .route_layer(middleware::from_extractor::<Claims>());
    router
}

I'm trying to extract Claims in the inner middleware, after the extractor.

pub async fn process_claims(
    req: Request,
    next: Next,
) -> Result<Response, StatusCode> {
    tracing::info!("process_claims");
    tracing::info!("is none: {}", &req.extensions().get::<Claims>().is_none());
    if let Some(claims) = req.extensions().get::<Claims>() {
        if claims.is_auth() {
            return Ok(next.run(req).await);
        }
    }

    tracing::error!("Token Middleware - Missing Claims");
    Err(StatusCode::INTERNAL_SERVER_ERROR)
}

The log always returns the error message.
req.extensions().get::<Claims>() is none

axum version

0.8.4

[amitnos123]

Solved

// Request → Claims extractor → process_claims → handler
pub fn get_router() -> Router<AppState> {
    let router: Router<AppState> = Router::new()
    .route(....)
    .route_layer(middleware::from_fn(process_claims))
    .route_layer(middleware::from_extractor::<Claims>());
    router
}

/// Middleware
pub async fn process_claims(
    c: Claims,
    mut req: Request,
    next: Next,
) -> Result<Response, StatusCode> {
    if c.is_auth() {
        req.extensions_mut().insert(c.clone());
        return Ok(next.run(req).await);
    }
    tracing::error!("Token Middleware - Missing Claims");
    Err(StatusCode::INTERNAL_SERVER_ERROR)
}

Tower_http layers work in first in last out

.route_layer(middleware::from_extractor::<Claims>()) is in the outer layer.
Then it extract Claims first.

After extracting, does the processing.
.route_layer(middleware::from_fn(process_claims))

---

For .route_layer(middleware::from_extractor::<Claims>())
We need

impl<S> FromRequestParts<S> for Claims
where
    S: Send + Sync,

---

Feel free to ask questions about what I did, if someone need help