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extern crate url;

use std::fmt::{self};
use std::str;

use header;

/// The `Access-Control-Allow-Origin` response header,
/// part of [CORS](http://www.w3.org/TR/cors/).
///
/// > The `Access-Control-Allow-Origin` header indicates whether a resource
/// > can be shared based by returning the value of the Origin request header,
/// > "*", or "null" in the response.
///
/// Spec: www.w3.org/TR/cors/#access-control-allow-origin-response-header
#[derive(Clone, PartialEq, Debug)]
pub enum AccessControlAllowOrigin {
    /// Allow all origins
    AllowStar,
    /// Allow one particular origin
    AllowOrigin(url::Url),
}

impl header::Header for AccessControlAllowOrigin {
    #[inline]
    fn header_name() -> &'static str {
        "Access-Control-Allow-Origin"
    }

    fn parse_header(raw: &[Vec<u8>]) -> Option<AccessControlAllowOrigin> {
        if raw.len() == 1 {
            match str::from_utf8(unsafe { &raw.get_unchecked(0)[..] }) {
                Ok(s) => {
                    if s == "*" {
                        Some(AccessControlAllowOrigin::AllowStar)
                    } else {
                        url::Url::parse(s).ok().map(
                            |url| AccessControlAllowOrigin::AllowOrigin(url))
                    }
                },
                _ => return None,
            }
        } else {
            return None;
        }
    }
}

impl header::HeaderFormat for AccessControlAllowOrigin {
    fn fmt_header(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match *self {
            AccessControlAllowOrigin::AllowStar => write!(f, "*"),
            AccessControlAllowOrigin::AllowOrigin(ref url) =>
                write!(f, "{}", url)
        }
    }
}