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use std::iter::FromIterator;
use util::FlatCsv;
use {HeaderName, HeaderValue};
/// `Access-Control-Allow-Headers` header, part of
///
/// The `Access-Control-Allow-Headers` header indicates, as part of the
/// response to a preflight request, which header field names can be used
/// during the actual request.
///
/// # ABNF
///
/// ```text
/// Access-Control-Allow-Headers: "Access-Control-Allow-Headers" ":" #field-name
/// ```
///
/// # Example values
/// * `accept-language, date`
///
/// # Examples
///
/// ```
/// # extern crate headers;
/// extern crate http;
/// use http::header::{CACHE_CONTROL, CONTENT_TYPE};
/// use headers::AccessControlAllowHeaders;
///
/// let allow_headers = vec![CACHE_CONTROL, CONTENT_TYPE]
/// .into_iter()
/// .collect::<AccessControlAllowHeaders>();
/// ```
#[derive(Clone, Debug, PartialEq)]
pub struct AccessControlAllowHeaders(FlatCsv);
derive_header! {
AccessControlAllowHeaders(_),
name: ACCESS_CONTROL_ALLOW_HEADERS
}
impl AccessControlAllowHeaders {
/// Returns an iterator over `HeaderName`s contained within.
pub fn iter<'a>(&'a self) -> impl Iterator<Item = HeaderName> + 'a {
self.0
.iter()
.map(|s| s.parse().ok())
.take_while(|val| val.is_some())
.filter_map(|val| val)
}
}
impl FromIterator<HeaderName> for AccessControlAllowHeaders {
fn from_iter<I>(iter: I) -> Self
where
I: IntoIterator<Item = HeaderName>,
{
let flat = iter.into_iter().map(HeaderValue::from).collect();
AccessControlAllowHeaders(flat)
}
}
#[cfg(test)]
mod tests {
use super::super::{test_decode, test_encode};
use super::*;
#[test]
fn iter() {
let allow_headers = test_decode::<AccessControlAllowHeaders>(&["foo, bar"]).unwrap();
let as_vec = allow_headers.iter().collect::<Vec<_>>();
assert_eq!(as_vec.len(), 2);
assert_eq!(as_vec[0], "foo");
assert_eq!(as_vec[1], "bar");
}
#[test]
fn from_iter() {
let allow: AccessControlAllowHeaders =
vec![::http::header::CACHE_CONTROL, ::http::header::IF_RANGE]
.into_iter()
.collect();
let headers = test_encode(allow);
assert_eq!(
headers["access-control-allow-headers"],
"cache-control, if-range"
);
}
#[test]
fn test_with_invalid() {
let allow_headers = test_decode::<AccessControlAllowHeaders>(&["foo foo, bar"]).unwrap();
assert!(allow_headers.iter().collect::<Vec<_>>().is_empty());
}
}