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use std::fmt::{self, Display};
use header::{Header, HeaderFormat};
/// 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
/// ```plain
/// Access-Control-Allow-Origin = "Access-Control-Allow-Origin" ":" origin-list-or-null | "*"
/// ```
///
/// # Example values
/// * `null`
/// * `*`
/// * `http://google.com/`
///
/// # Examples
/// ```
/// use hyper::header::{Headers, AccessControlAllowOrigin};
///
/// let mut headers = Headers::new();
/// headers.set(
/// AccessControlAllowOrigin::Any
/// );
/// ```
/// ```
/// use hyper::header::{Headers, AccessControlAllowOrigin};
///
/// let mut headers = Headers::new();
/// headers.set(
/// AccessControlAllowOrigin::Null,
/// );
/// ```
/// ```
/// use hyper::header::{Headers, AccessControlAllowOrigin};
///
/// let mut headers = Headers::new();
/// headers.set(
/// 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(raw: &[Vec<u8>]) -> ::Result<AccessControlAllowOrigin> {
if raw.len() != 1 {
return Err(::Error::Header)
}
let value = unsafe { raw.get_unchecked(0) };
Ok(match &value[..] {
b"*" => AccessControlAllowOrigin::Any,
b"null" => AccessControlAllowOrigin::Null,
_ => AccessControlAllowOrigin::Value(try!(String::from_utf8(value.clone())))
})
}
}
impl HeaderFormat for AccessControlAllowOrigin {
fn fmt_header(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
AccessControlAllowOrigin::Any => f.write_str("*"),
AccessControlAllowOrigin::Null => f.write_str("null"),
AccessControlAllowOrigin::Value(ref url) => Display::fmt(url, f),
}
}
}
impl Display for AccessControlAllowOrigin {
fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
self.fmt_header(f)
}
}
#[cfg(test)]
mod test_access_control_allow_orgin {
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/"]);
}