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use std::fmt::{self, Display};
use std::str;
use header::{Header, RawLike};
/// The `Access-Control-Allow-Origin` response header,
/// part of [CORS](http://www.w3.org/TR/cors/#access-control-allow-origin-response-header)
///
/// 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.
///
/// # ABNF
///
/// ```text
/// Access-Control-Allow-Origin = "Access-Control-Allow-Origin" ":" origin-list-or-null | "*"
/// ```
///
/// # Example values
/// * `null`
/// * `*`
/// * `http://google.com/`
///
/// # Examples
/// ```
/// # extern crate http;
/// use hyperx::header::{AccessControlAllowOrigin, TypedHeaders};
///
/// let mut headers = http::HeaderMap::new();
/// headers.encode(
/// &AccessControlAllowOrigin::Any
/// );
/// ```
/// ```
/// # extern crate http;
/// use hyperx::header::{AccessControlAllowOrigin, TypedHeaders};
///
/// let mut headers = http::HeaderMap::new();
/// headers.encode(
/// &AccessControlAllowOrigin::Null,
/// );
/// ```
/// ```
/// # extern crate http;
/// use hyperx::header::{AccessControlAllowOrigin, TypedHeaders};
///
/// let mut headers = http::HeaderMap::new();
/// headers.encode(
/// &AccessControlAllowOrigin::Value("http://hyper.rs".to_owned())
/// );
/// ```
#[derive(Clone, PartialEq, Debug)]
pub enum AccessControlAllowOrigin {
/// Allow all origins
Any,
/// A hidden origin
Null,
/// Allow one particular origin
Value(String),
}
impl Header for AccessControlAllowOrigin {
fn header_name() -> &'static str {
"Access-Control-Allow-Origin"
}
fn parse_header<'a, T>(raw: &'a T) -> ::Result<AccessControlAllowOrigin>
where T: RawLike<'a>
{
if let Some(line) = raw.one() {
Ok(match line {
b"*" => AccessControlAllowOrigin::Any,
b"null" => AccessControlAllowOrigin::Null,
_ => AccessControlAllowOrigin::Value(str::from_utf8(line)?.into())
})
} else {
Err(::Error::Header)
}
}
fn fmt_header(&self, f: &mut ::header::Formatter) -> fmt::Result {
f.fmt_line(self)
}
}
impl Display for AccessControlAllowOrigin {
fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
match *self {
AccessControlAllowOrigin::Any => f.write_str("*"),
AccessControlAllowOrigin::Null => f.write_str("null"),
AccessControlAllowOrigin::Value(ref url) => Display::fmt(url, f),
}
}
}
#[cfg(test)]
mod test_access_control_allow_origin {
use header::*;
use super::AccessControlAllowOrigin as HeaderField;
test_header!(test1, vec![b"null"]);
test_header!(test2, vec![b"*"]);
test_header!(test3, vec![b"http://google.com/"]);
}
standard_header!(AccessControlAllowOrigin, ACCESS_CONTROL_ALLOW_ORIGIN);