Iron demo

Cargo.toml

[package]
name = "car_demo"
version = "0.0.1"

[dependencies]
iron = "*"
router = "*"
urlencoded = "*"

main.rs

extern crate iron;
extern crate router;
extern crate urlencoded;

use iron::mime::Mime;
use iron::prelude::*;
use iron::status;
use router::Router;
use urlencoded::UrlEncodedBody;

static FORM_PAGE: &'static str = r#"
<form action="car" method="POST">
    <select name="car">
        <option value="volvo">Volvo</option>
        <option value="saab">Saab</option>
        <option value="fiat">Fiat</option>
        <option value="audi">Audi</option>
    </select>
    <input type="submit">
</form>
"#;

fn post_param<'a>(req: &'a mut Request, key: &str) -> Option<&'a String> {
    match req.get_ref::<UrlEncodedBody>() {
        Ok(ref hashmap) => hashmap.get(key).map_or(None, |vec| vec.first()),
        Err(_) => None
    }
}

fn main() {
    let mut router = Router::new();
    router.get("/", root_handler);
    router.post("/car", car_handler);

    Iron::new(router).http("localhost:3000").unwrap();

    fn root_handler(_: &mut Request) -> IronResult<Response> {
        let content_type = "text/html".parse::<Mime>().unwrap();
        Ok(Response::with((status::Ok, content_type, FORM_PAGE)))
    }

    fn car_handler(req: &mut Request) -> IronResult<Response> {
        let response = format!("Car selected: {:?}!", post_param(req, "car"));
        Ok(Response::with((status::Ok, response)))
    }
}