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use std::iter::FromIterator;
use util::FlatCsv;
use {HeaderName, HeaderValue};
/// `Access-Control-Expose-Headers` header, part of
///
/// The Access-Control-Expose-Headers header indicates which headers are safe to expose to the
/// API of a CORS API specification.
///
/// # ABNF
///
/// ```text
/// Access-Control-Expose-Headers = "Access-Control-Expose-Headers" ":" #field-name
/// ```
///
/// # Example values
/// * `ETag, Content-Length`
///
/// # Examples
///
/// ```
/// # extern crate headers;
/// extern crate http;
/// # fn main() {
/// use http::header::{CONTENT_LENGTH, ETAG};
/// use headers::AccessControlExposeHeaders;
///
/// let expose = vec![CONTENT_LENGTH, ETAG]
/// .into_iter()
/// .collect::<AccessControlExposeHeaders>();
/// # }
/// ```
#[derive(Clone, Debug)]
pub struct AccessControlExposeHeaders(FlatCsv);
derive_header! {
AccessControlExposeHeaders(_),
name: ACCESS_CONTROL_EXPOSE_HEADERS
}
impl AccessControlExposeHeaders {
/// Returns an iterator over `HeaderName`s contained within.
pub fn iter<'a>(&'a self) -> impl Iterator<Item = HeaderName> + 'a {
self.0.iter().filter_map(|s| s.parse().ok())
}
}
impl FromIterator<HeaderName> for AccessControlExposeHeaders {
fn from_iter<I>(iter: I) -> Self
where
I: IntoIterator<Item = HeaderName>,
{
let flat = iter.into_iter().map(HeaderValue::from).collect();
AccessControlExposeHeaders(flat)
}
}
#[cfg(test)]
mod tests {
use super::super::{test_decode, test_encode};
use super::*;
#[test]
fn iter() {
let expose_headers = test_decode::<AccessControlExposeHeaders>(&["foo, bar"]).unwrap();
let as_vec = expose_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 expose: AccessControlExposeHeaders =
vec![::http::header::CACHE_CONTROL, ::http::header::IF_RANGE]
.into_iter()
.collect();
let headers = test_encode(expose);
assert_eq!(
headers["access-control-expose-headers"],
"cache-control, if-range"
);
}
}