Hands-On Microservices with Rust

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The handler for creating new comments uses the identity of a user to check that there are credentials to add a new comment:

fn new_comment((req, params): (HttpRequest<State>, Form<AddComment>))    -> FutureResponse<HttpResponse>{    let fut = req.identity()        .ok_or(format_err!("not authorized").into())        .into_future()        .and_then(move |uid| {            let params = NewComment {                uid,                text: params.into_inner().text,            };            post_request::<_, ()>("http://127.0.0.1:8003/new_comment", params)        })        .then(move |_| {            let res = HttpResponse::build_from(&req)                .status(StatusCode::FOUND)                .header(header::LOCATION, "/comments.html")                .finish();            Ok(res)        });    Box::new(fut)}

This handler allows every user who has signed it to leave a comment. Let's look at how this handler ...