CODEWITHSUNDEEP
rustrust-actix
unegare
unegare

Reputation: 2579

How to use actix_web::guard::Header?

In order to support application/json and multipart/form-data on the same URL, I would like to check the "Content-Type" header and choose a proper Data<T> type to hand in to the .data function of App::new.

If I uncomment the .guard line, then curl -X POST -H "Content-Type: multipart/form-data" -F files=\"qqq\" localhost:8080/upload is dropped. But without the .guard line all works as it was supposed. What is wrong?

HttpServer::new(move || {
    App::new()
        .service(resource("/upload")
     // .guard(actix_web::guard::Header("Content-Type", "multipart/form-data"))
        .data(form.clone())
        .route(post()
        .to(upload_multipart)
        )   
    )
})

How to join them properly in one instance of App?

Upvotes: 0

Views: 1255

Answers (1)

arve0
arve0

Reputation: 3647

Currently, actix-web 1.0.3 does not support multipart/form-data, but you can use actix_multipart. Since the focus is deserializing same data with different content-types, I've simplified to using application/x-www-form-urlencoded.

To support two different content-types, nest web::resource and add guards to each of the handlers:

web::resource("/")
    .route(
        web::post()
            .guard(guard::Header(
                "content-type",
                "application/x-www-form-urlencoded",
            ))
            .to(form_handler),
    )
    .route(
        web::post()
            .guard(guard::Header("content-type", "application/json"))
            .to(json_handler),
    ),

Create handlers that takes deserialized data, and send the data to a common handler:

fn form_handler(user: web::Form<User>) -> String {
    handler(user.into_inner())
}

fn json_handler(user: web::Json<User>) -> String {
    handler(user.into_inner())
}

fn handler(user: User) -> String {
    format!("Got username: {}", user.username)
}

Result:

$ curl -d 'username=adsf' localhost:8000
Got username: asdf⏎
$ curl -d '{"username": "asdf"}' localhost:8000
Parse error⏎
$ curl -d '{"username": "asdf"}' -H 'content-type: application/json' localhost:8000
Got username: asdf⏎

To create your own deserializer, implement the FromRequest trait.

Upvotes: 2

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