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use std::iter::FromIterator;
use http::Method;
use util::FlatCsv;
/// `Access-Control-Allow-Methods` header, part of
///
/// The `Access-Control-Allow-Methods` header indicates, as part of the
/// response to a preflight request, which methods can be used during the
/// actual request.
///
/// # ABNF
///
/// ```text
/// Access-Control-Allow-Methods: "Access-Control-Allow-Methods" ":" #Method
/// ```
///
/// # Example values
/// * `PUT, DELETE, XMODIFY`
///
/// # Examples
///
/// ```
/// # extern crate headers;
/// extern crate http;
/// use http::Method;
/// use headers::AccessControlAllowMethods;
///
/// let allow_methods = vec![Method::GET, Method::PUT]
/// .into_iter()
/// .collect::<AccessControlAllowMethods>();
/// ```
#[derive(Clone, Debug, PartialEq)]
pub struct AccessControlAllowMethods(FlatCsv);
derive_header! {
AccessControlAllowMethods(_),
name: ACCESS_CONTROL_ALLOW_METHODS
}
impl AccessControlAllowMethods {
/// Returns an iterator over `Method`s contained within.
pub fn iter<'a>(&'a self) -> impl Iterator<Item = Method> + 'a {
self.0.iter().filter_map(|s| s.parse().ok())
}
}
impl FromIterator<Method> for AccessControlAllowMethods {
fn from_iter<I>(iter: I) -> Self
where
I: IntoIterator<Item = Method>,
{
let methods = iter
.into_iter()
.map(|method| {
method
.as_str()
.parse::<::HeaderValue>()
.expect("Method is a valid HeaderValue")
})
.collect();
AccessControlAllowMethods(methods)
}
}
#[cfg(test)]
mod tests {
use super::super::{test_decode, test_encode};
use super::*;
#[test]
fn iter() {
let allowed = test_decode::<AccessControlAllowMethods>(&["GET, PUT"]).unwrap();
let as_vec = allowed.iter().collect::<Vec<_>>();
assert_eq!(as_vec.len(), 2);
assert_eq!(as_vec[0], Method::GET);
assert_eq!(as_vec[1], Method::PUT);
}
#[test]
fn from_iter() {
let allow: AccessControlAllowMethods = vec![Method::GET, Method::PUT].into_iter().collect();
let headers = test_encode(allow);
assert_eq!(headers["access-control-allow-methods"], "GET, PUT");
}
}