rocket_cors/examples/manual.rs

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#![feature(proc_macro_hygiene, decl_macro)]
use rocket;
use rocket_cors;
use std::io::Cursor;
use rocket::http::Method;
use rocket::response::Responder;
use rocket::{get, options, routes, Response, State};
use rocket_cors::{AllowedHeaders, AllowedOrigins, Cors, CorsOptions};
/// Using a borrowed Cors
///
/// You might want to borrow the `Cors` struct from Rocket's state, for example. Unless you have
/// special handling, you might want to use the Guard method instead which has less hassle.
///
/// Note that the `'r` lifetime annotation is not requred here because `State` borrows with lifetime
/// `'r` and so does `Responder`!
#[get("/")]
fn borrowed(options: State<'_, Cors>) -> impl Responder<'_> {
options
.inner()
.respond_borrowed(|guard| guard.responder("Hello CORS"))
}
/// Using a `Response` instead of a `Responder`. You generally won't have to do this.
/// Note that the `'r` lifetime annotation is not requred here because `State` borrows with lifetime
/// `'r` and so does `Responder`!
#[get("/response")]
fn response(options: State<'_, Cors>) -> impl Responder<'_> {
let mut response = Response::new();
response.set_sized_body(Cursor::new("Hello CORS!"));
options
.inner()
.respond_borrowed(move |guard| guard.response(response))
}
/// Create and use an ad-hoc Cors
/// Note that the `'r` lifetime is needed because the compiler cannot elide anything.
///
/// This is the most likely scenario when you want to have manual CORS validation. You can use this
/// when the settings you want to use for a route is not the same as the rest of the application
/// (which you might have put in Rocket's state).
#[get("/owned")]
fn owned<'r>() -> impl Responder<'r> {
let options = cors_options().to_cors()?;
options.respond_owned(|guard| guard.responder("Hello CORS"))
}
/// You need to define an OPTIONS route for preflight checks if you want to use `Cors` struct
/// that is not in Rocket's managed state.
/// These routes can just return the unit type `()`
/// Note that the `'r` lifetime is needed because the compiler cannot elide anything.
#[options("/owned")]
fn owned_options<'r>() -> impl Responder<'r> {
let options = cors_options().to_cors()?;
options.respond_owned(|guard| guard.responder(()))
}
fn cors_options() -> CorsOptions {
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let allowed_origins = AllowedOrigins::some(&["https://www.acme.com"]);
// You can also deserialize this
rocket_cors::CorsOptions {
allowed_origins: allowed_origins,
allowed_methods: vec![Method::Get].into_iter().map(From::from).collect(),
allowed_headers: AllowedHeaders::some(&["Authorization", "Accept"]),
allow_credentials: true,
..Default::default()
}
}
fn main() {
rocket::ignite()
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.mount("/", routes![borrowed, response, owned, owned_options,])
.mount("/", rocket_cors::catch_all_options_routes()) // mount the catch all routes
.manage(cors_options().to_cors().expect("To not fail"))
.launch();
}