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use bytes::Bytes;
use headers_core::decode::TryFromValues;
use http::uri::{self, Authority, Scheme, Uri};
use ::{HeaderValue};
/// The `Origin` header.
///
/// The `Origin` header is a version of the `Referer` header that is used for all HTTP fetches and `POST`s whose CORS flag is set.
/// This header is often used to inform recipients of the security context of where the request was initiated.
///
/// Following the spec, [https://fetch.spec.whatwg.org/#origin-header][url], the value of this header is composed of
/// a String (scheme), Host (host/port)
///
/// [url]: https://fetch.spec.whatwg.org/#origin-header
///
/// # Examples
///
/// ```
/// # extern crate headers_ext as headers;
/// use headers::Origin;
///
/// let origin = Origin::NULL;
/// ```
#[derive(Clone, Debug, PartialEq, Eq, Hash, Header)]
pub struct Origin(OriginOrNull);
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
enum OriginOrNull {
Origin(Scheme, Authority),
Null,
}
impl Origin {
/// The literal `null` Origin header.
pub const NULL: Origin = Origin(OriginOrNull::Null);
/// Checks if `Origin` is `null`.
pub fn is_null(&self) -> bool {
match self {
&Origin(OriginOrNull::Null) => true,
_ => false,
}
}
// Used in AccessControlAllowOrigin
pub(super) fn try_from_value(value: &HeaderValue) -> Option<Self> {
OriginOrNull::try_from_value(value)
.map(Origin)
}
pub(super) fn into_value(&self) -> HeaderValue {
(&self.0).into()
}
}
impl OriginOrNull {
fn try_from_value(value: &HeaderValue) -> Option<Self> {
if value == "null" {
return Some(OriginOrNull::Null);
}
let bytes = Bytes::from(value.clone());
let uri = Uri::from_shared(bytes).ok()?;
let (scheme, auth) = match uri.into_parts() {
uri::Parts {
scheme: Some(scheme),
authority: Some(auth),
path_and_query: None,
..
} => (scheme, auth),
_ => {
return None;
}
};
Some(OriginOrNull::Origin(scheme, auth))
}
}
impl TryFromValues for OriginOrNull {
fn try_from_values(values: &mut ::Values) -> Option<OriginOrNull> {
values
.next()
.and_then(OriginOrNull::try_from_value)
}
}
impl<'a> From<&'a OriginOrNull> for HeaderValue {
fn from(origin: &'a OriginOrNull) -> HeaderValue {
match origin {
OriginOrNull::Origin(ref scheme, ref auth) => {
let s = format!("{}://{}", scheme, auth);
let bytes = Bytes::from(s);
HeaderValue::from_shared(bytes)
.expect("Scheme and Authority are valid header values")
},
// Serialized as "null" per ASCII serialization of an origin
// https://html.spec.whatwg.org/multipage/browsers.html#ascii-serialisation-of-an-origin
OriginOrNull::Null => HeaderValue::from_static("null"),
}
}
}
/*
#[cfg(test)]
mod tests {
use super::Origin;
use Header;
use std::borrow::Cow;
#[test]
fn test_origin() {
let origin : Origin = Header::parse_header(&vec![b"http://foo.com".to_vec()].into()).unwrap();
assert_eq!(&origin, &Origin::new("http", "foo.com", None));
assert_borrowed!(origin.scheme().unwrap().into());
let origin : Origin = Header::parse_header(&vec![b"https://foo.com:443".to_vec()].into()).unwrap();
assert_eq!(&origin, &Origin::new("https", "foo.com", Some(443)));
assert_borrowed!(origin.scheme().unwrap().into());
}
}
*/