//! This is an example of how you can mix and match the "Truly manual" mode with "Guard".
//!
//! In this example, you typically have an application wide `Cors` struct except for one specific
//! `ping` route that you want to allow all Origins to access.
use rocket::http::hyper;
use rocket::http::{Header, Method, Status};
use rocket::local::blocking::Client;
use rocket::response::Responder;
use rocket::{get, options, routes};

use rocket_cors::{AllowedHeaders, AllowedOrigins, CorsOptions, Guard};

static ORIGIN: http::header::HeaderName = hyper::header::ORIGIN;
static ACCESS_CONTROL_REQUEST_METHOD: http::header::HeaderName =
    hyper::header::ACCESS_CONTROL_REQUEST_METHOD;
static ACCESS_CONTROL_REQUEST_HEADERS: http::header::HeaderName =
    hyper::header::ACCESS_CONTROL_REQUEST_HEADERS;

/// The "usual" app route
#[get("/")]
fn app(cors: Guard<'_>) -> rocket_cors::Responder<&str> {
    cors.responder("Hello CORS!")
}

/// The special "ping" route
#[get("/ping")]
fn ping<'r, 'o: 'r>() -> impl Responder<'r, 'o> {
    let cors = cors_options_all().to_cors()?;
    cors.respond_owned(|guard| guard.responder("Pong!"))
}

/// 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 `()`
#[options("/ping")]
fn ping_options<'r, 'o: 'r>() -> impl Responder<'r, 'o> {
    let cors = cors_options_all().to_cors()?;
    cors.respond_owned(|guard| guard.responder(()))
}

/// Returns the "application wide" Cors struct
fn cors_options() -> CorsOptions {
    let allowed_origins = AllowedOrigins::some_exact(&["https://www.acme.com"]);

    // You can also deserialize this
    rocket_cors::CorsOptions {
        allowed_origins,
        allowed_methods: vec![Method::Get].into_iter().map(From::from).collect(),
        allowed_headers: AllowedHeaders::some(&["Authorization", "Accept"]),
        allow_credentials: true,
        ..Default::default()
    }
}

/// A special struct that allows all origins
///
/// Note: In your real application, you might want to use something like `lazy_static` to generate
/// a `&'static` reference to this instead of creating a new struct on every request.
fn cors_options_all() -> CorsOptions {
    // You can also deserialize this
    Default::default()
}

fn rocket() -> rocket::Rocket<rocket::Build> {
    rocket::build()
        .mount("/", routes![app, ping, ping_options,])
        .mount("/", rocket_cors::catch_all_options_routes()) // mount the catch all routes
        .manage(cors_options().to_cors().expect("Not to fail"))
}

#[test]
fn smoke_test() {
    let client = Client::tracked(rocket()).unwrap();

    // `Options` pre-flight checks
    let origin_header = Header::new(ORIGIN.as_str(), "https://www.acme.com");
    let method_header = Header::new(
        ACCESS_CONTROL_REQUEST_METHOD.as_str(),
        hyper::Method::GET.as_str(),
    );
    let request_headers = Header::new(ACCESS_CONTROL_REQUEST_HEADERS.as_str(), "Authorization");
    let req = client
        .options("/")
        .header(origin_header)
        .header(method_header)
        .header(request_headers);

    let response = req.dispatch();
    assert!(response.status().class().is_success());

    // "Actual" request
    let origin_header = Header::new(ORIGIN.as_str(), "https://www.acme.com");
    let authorization = Header::new("Authorization", "let me in");
    let req = client.get("/").header(origin_header).header(authorization);

    let response = req.dispatch();
    assert!(response.status().class().is_success());
    let origin_header = response
        .headers()
        .get_one("Access-Control-Allow-Origin")
        .expect("to exist");
    assert_eq!("https://www.acme.com", origin_header);
    let body_str = response.into_string();
    assert_eq!(body_str, Some("Hello CORS!".to_string()));
}

#[test]
fn cors_options_check() {
    let client = Client::tracked(rocket()).unwrap();

    let origin_header = Header::new(ORIGIN.as_str(), "https://www.acme.com");
    let method_header = Header::new(
        ACCESS_CONTROL_REQUEST_METHOD.as_str(),
        hyper::Method::GET.as_str(),
    );
    let request_headers = Header::new(ACCESS_CONTROL_REQUEST_HEADERS.as_str(), "Authorization");
    let req = client
        .options("/")
        .header(origin_header)
        .header(method_header)
        .header(request_headers);

    let response = req.dispatch();
    assert!(response.status().class().is_success());

    let origin_header = response
        .headers()
        .get_one("Access-Control-Allow-Origin")
        .expect("to exist");
    assert_eq!("https://www.acme.com", origin_header);
}

#[test]
fn cors_get_check() {
    let client = Client::tracked(rocket()).unwrap();

    let origin_header = Header::new(ORIGIN.as_str(), "https://www.acme.com");
    let authorization = Header::new("Authorization", "let me in");
    let req = client.get("/").header(origin_header).header(authorization);

    let response = req.dispatch();
    assert!(response.status().class().is_success());
    let origin_header = response
        .headers()
        .get_one("Access-Control-Allow-Origin")
        .expect("to exist");
    assert_eq!("https://www.acme.com", origin_header);
    let body_str = response.into_string();
    assert_eq!(body_str, Some("Hello CORS!".to_string()));
}

/// This test is to check that non CORS compliant requests to GET should still work. (i.e. curl)
#[test]
fn cors_get_no_origin() {
    let client = Client::tracked(rocket()).unwrap();

    let authorization = Header::new("Authorization", "let me in");
    let req = client.get("/").header(authorization);

    let response = req.dispatch();
    assert!(response.status().class().is_success());
    let body_str = response.into_string();
    assert_eq!(body_str, Some("Hello CORS!".to_string()));
}

#[test]
fn cors_options_bad_origin() {
    let client = Client::tracked(rocket()).unwrap();

    let origin_header = Header::new(ORIGIN.as_str(), "https://www.bad-origin.com");
    let method_header = Header::new(
        ACCESS_CONTROL_REQUEST_METHOD.as_str(),
        hyper::Method::GET.as_str(),
    );
    let request_headers = Header::new(ACCESS_CONTROL_REQUEST_HEADERS.as_str(), "Authorization");
    let req = client
        .options("/")
        .header(origin_header)
        .header(method_header)
        .header(request_headers);

    let response = req.dispatch();
    assert_eq!(response.status(), Status::Forbidden);
}

#[test]
fn cors_options_missing_origin() {
    let client = Client::tracked(rocket()).unwrap();

    let method_header = Header::new(
        ACCESS_CONTROL_REQUEST_METHOD.as_str(),
        hyper::Method::GET.as_str(),
    );
    let request_headers = Header::new(ACCESS_CONTROL_REQUEST_HEADERS.as_str(), "Authorization");
    let req = client
        .options("/")
        .header(method_header)
        .header(request_headers);

    let response = req.dispatch();
    assert!(response.status().class().is_success());
    assert!(response
        .headers()
        .get_one("Access-Control-Allow-Origin")
        .is_none());
}

#[test]
fn cors_options_bad_request_method() {
    let client = Client::tracked(rocket()).unwrap();

    let origin_header = Header::new(ORIGIN.as_str(), "https://www.acme.com");
    let method_header = Header::new(
        ACCESS_CONTROL_REQUEST_METHOD.as_str(),
        hyper::Method::POST.as_str(),
    );
    let request_headers = Header::new(ACCESS_CONTROL_REQUEST_HEADERS.as_str(), "Authorization");
    let req = client
        .options("/")
        .header(origin_header)
        .header(method_header)
        .header(request_headers);

    let response = req.dispatch();
    assert_eq!(response.status(), Status::Forbidden);
    assert!(response
        .headers()
        .get_one("Access-Control-Allow-Origin")
        .is_none());
}

#[test]
fn cors_options_bad_request_header() {
    let client = Client::tracked(rocket()).unwrap();

    let origin_header = Header::new(ORIGIN.as_str(), "https://www.acme.com");
    let method_header = Header::new(
        ACCESS_CONTROL_REQUEST_METHOD.as_str(),
        hyper::Method::GET.as_str(),
    );
    let request_headers = Header::new(ACCESS_CONTROL_REQUEST_HEADERS.as_str(), "Foobar");
    let req = client
        .options("/")
        .header(origin_header)
        .header(method_header)
        .header(request_headers);

    let response = req.dispatch();
    assert_eq!(response.status(), Status::Forbidden);
    assert!(response
        .headers()
        .get_one("Access-Control-Allow-Origin")
        .is_none());
}

#[test]
fn cors_get_bad_origin() {
    let client = Client::tracked(rocket()).unwrap();

    let origin_header = Header::new(ORIGIN.as_str(), "https://www.bad-origin.com");
    let authorization = Header::new("Authorization", "let me in");
    let req = client.get("/").header(origin_header).header(authorization);

    let response = req.dispatch();
    assert_eq!(response.status(), Status::Forbidden);
    assert!(response
        .headers()
        .get_one("Access-Control-Allow-Origin")
        .is_none());
}

/// Tests that the `ping` route accepts other Origins
#[test]
fn cors_options_ping_check() {
    let client = Client::tracked(rocket()).unwrap();

    let origin_header = Header::new(ORIGIN.as_str(), "https://www.example.com");
    let method_header = Header::new(
        ACCESS_CONTROL_REQUEST_METHOD.as_str(),
        hyper::Method::GET.as_str(),
    );

    let req = client
        .options("/ping")
        .header(origin_header)
        .header(method_header);

    let response = req.dispatch();
    assert!(response.status().class().is_success());

    let origin_header = response
        .headers()
        .get_one("Access-Control-Allow-Origin")
        .expect("to exist");
    assert_eq!("https://www.example.com", origin_header);
}

/// Tests that the `ping` route accepts other Origins
#[test]
fn cors_get_ping_check() {
    let client = Client::tracked(rocket()).unwrap();

    let origin_header = Header::new(ORIGIN.as_str(), "https://www.example.com");

    let req = client.get("/ping").header(origin_header);

    let response = req.dispatch();
    assert!(response.status().class().is_success());
    let origin_header = response
        .headers()
        .get_one("Access-Control-Allow-Origin")
        .expect("to exist");
    assert_eq!("https://www.example.com", origin_header);
    let body_str = response.into_string();
    assert_eq!(body_str, Some("Pong!".to_string()));
}