use std::{array, fmt};
use http::{
header::{self, HeaderName, HeaderValue},
request::Parts as RequestParts,
};
use super::{separated_by_commas, Any, WILDCARD};
#[derive(Clone, Default)]
#[must_use]
pub struct AllowHeaders(AllowHeadersInner);
impl AllowHeaders {
pub fn any() -> Self {
Self(AllowHeadersInner::Const(Some(WILDCARD)))
}
pub fn list<I>(headers: I) -> Self
where
I: IntoIterator<Item = HeaderName>,
{
Self(AllowHeadersInner::Const(separated_by_commas(
headers.into_iter().map(Into::into),
)))
}
pub fn mirror_request() -> Self {
Self(AllowHeadersInner::MirrorRequest)
}
#[allow(clippy::borrow_interior_mutable_const)]
pub(super) fn is_wildcard(&self) -> bool {
matches!(&self.0, AllowHeadersInner::Const(Some(v)) if v == WILDCARD)
}
pub(super) fn to_header(&self, parts: &RequestParts) -> Option<(HeaderName, HeaderValue)> {
let allow_headers = match &self.0 {
AllowHeadersInner::Const(v) => v.clone()?,
AllowHeadersInner::MirrorRequest => parts
.headers
.get(header::ACCESS_CONTROL_REQUEST_HEADERS)?
.clone(),
};
Some((header::ACCESS_CONTROL_ALLOW_HEADERS, allow_headers))
}
}
impl fmt::Debug for AllowHeaders {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match &self.0 {
AllowHeadersInner::Const(inner) => f.debug_tuple("Const").field(inner).finish(),
AllowHeadersInner::MirrorRequest => f.debug_tuple("MirrorRequest").finish(),
}
}
}
impl From<Any> for AllowHeaders {
fn from(_: Any) -> Self {
Self::any()
}
}
impl<const N: usize> From<[HeaderName; N]> for AllowHeaders {
fn from(arr: [HeaderName; N]) -> Self {
#[allow(deprecated)] Self::list(array::IntoIter::new(arr))
}
}
impl From<Vec<HeaderName>> for AllowHeaders {
fn from(vec: Vec<HeaderName>) -> Self {
Self::list(vec)
}
}
#[derive(Clone)]
enum AllowHeadersInner {
Const(Option<HeaderValue>),
MirrorRequest,
}
impl Default for AllowHeadersInner {
fn default() -> Self {
Self::Const(None)
}
}