//! HTTP extensions.
use bytes::Bytes;
#[cfg(any(feature =
"http1", feature =
"ffi"))]
use http::header::HeaderName;
#[cfg(feature =
"http1")]
use http::header::{IntoHeaderName, ValueIter};
use http::HeaderMap;
#[cfg(feature =
"ffi")]
use std::collections::HashMap;
#[cfg(feature =
"http2")]
use std::fmt;
#[cfg(any(feature =
"http1", feature =
"ffi"))]
mod h1_reason_phrase;
#[cfg(any(feature =
"http1", feature =
"ffi"))]
pub use h1_reason_phrase::ReasonPhrase;
#[cfg(feature =
"http2")]
/// Represents the `:protocol` pseudo-header used by
/// the [Extended CONNECT Protocol].
///
/// [Extended CONNECT Protocol]: https://datatracker.ietf.org/doc/html/rfc8441#section-4
#[derive(Clone, Eq, PartialEq)]
pub struct Protocol {
inner: h2::ext::Protocol,
}
#[cfg(feature =
"http2")]
impl Protocol {
/// Converts a static string to a protocol name.
pub const fn from_static(value: &
'static str) -> Self {
Self {
inner: h2::ext::Protocol::from_static(value),
}
}
/// Returns a str representation of the header.
pub fn as_str(&
self) -> &str {
self.inner.as_str()
}
#[cfg(feature =
"server")]
pub(
crate)
fn from_inner(inner: h2::ext::Protocol) ->
Self {
Self { inner }
}
pub(
crate)
fn into_inner(
self) -> h2::ext::Protocol {
self.inner
}
}
#[cfg(feature =
"http2")]
impl<
'a> From<&'a str>
for Protocol {
fn from(value: &
'a str) -> Self {
Self {
inner: h2::ext::Protocol::from(value),
}
}
}
#[cfg(feature =
"http2")]
impl AsRef<[u8]>
for Protocol {
fn as_ref(&
self) -> &[u8] {
self.inner.as_ref()
}
}
#[cfg(feature =
"http2")]
impl fmt::Debug
for Protocol {
fn fmt(&
self, f: &
mut fmt::Formatter<
'_>) -> fmt::Result {
self.inner.fmt(f)
}
}
/// A map from header names to their original casing as received in an HTTP message.
///
/// If an HTTP/1 response `res` is parsed on a connection whose option
/// [`http1_preserve_header_case`] was set to true and the response included
/// the following headers:
///
/// ```ignore
/// x-Bread: Baguette
/// X-BREAD: Pain
/// x-bread: Ficelle
/// ```
///
/// Then `res.extensions().get::<HeaderCaseMap>()` will return a map with:
///
/// ```ignore
/// HeaderCaseMap({
/// "x-bread": ["x-Bread", "X-BREAD", "x-bread"],
/// })
/// ```
///
/// [`http1_preserve_header_case`]: /client/struct.Client.html#method.http1_preserve_header_case
#[derive(Clone, Debug)]
pub(
crate)
struct HeaderCaseMap(HeaderMap<Bytes>);
#[cfg(feature =
"http1")]
impl HeaderCaseMap {
/// Returns a view of all spellings associated with that header name,
/// in the order they were found.
pub(
crate)
fn get_all<
'a>(
&
'a self,
name: &HeaderName,
) ->
impl Iterator<Item =
impl AsRef<[u8]> +
'a> + 'a {
self.get_all_internal(name).into_iter()
}
/// Returns a view of all spellings associated with that header name,
/// in the order they were found.
pub(
crate)
fn get_all_internal<
'a>(&'a
self, name: &HeaderName) -> ValueIter<
'_, Bytes> {
self.
0.get_all(name).into_iter()
}
pub(
crate)
fn default() ->
Self {
Self(Default::default())
}
#[cfg(any(test, feature =
"ffi"))]
pub(
crate)
fn insert(&
mut self, name: HeaderName, orig: Bytes) {
self.
0.insert(name, orig);
}
pub(
crate)
fn append<N>(&
mut self, name: N, orig: Bytes)
where
N: IntoHeaderName,
{
self.
0.append(name, orig);
}
}
#[cfg(feature =
"ffi")]
#[derive(Clone, Debug)]
/// Hashmap<Headername, numheaders with that name>
pub(
crate)
struct OriginalHeaderOrder {
/// Stores how many entries a Headername maps to. This is used
/// for accounting.
num_entries: HashMap<HeaderName, usize>,
/// Stores the ordering of the headers. ex: `vec[i] = (headerName, idx)`,
/// The vector is ordered such that the ith element
/// represents the ith header that came in off the line.
/// The `HeaderName` and `idx` are then used elsewhere to index into
/// the multi map that stores the header values.
entry_order: Vec<(HeaderName, usize)>,
}
#[cfg(all(feature =
"http1", feature =
"ffi"))]
impl OriginalHeaderOrder {
pub(
crate)
fn default() ->
Self {
OriginalHeaderOrder {
num_entries: HashMap::new(),
entry_order: Vec::new(),
}
}
pub(
crate)
fn insert(&
mut self, name: HeaderName) {
if !
self.num_entries.contains_key(&name) {
let idx =
0;
self.num_entries.insert(name.clone(),
1);
self.entry_order.push((name, idx));
}
// Replacing an already existing element does not
// change ordering, so we only care if its the first
// header name encountered
}
pub(
crate)
fn append<N>(&
mut self, name: N)
where
N: IntoHeaderName + Into<HeaderName> + Clone,
{
let name: HeaderName = name.into();
let idx;
if self.num_entries.contains_key(&name) {
idx =
self.num_entries[&name];
*
self.num_entries.get_mut(&name).unwrap() +=
1;
}
else {
idx =
0;
self.num_entries.insert(name.clone(),
1);
}
self.entry_order.push((name, idx));
}
// No doc test is run here because `RUSTFLAGS='--cfg hyper_unstable_ffi'`
// is needed to compile. Once ffi is stablized `no_run` should be removed
// here.
/// This returns an iterator that provides header names and indexes
/// in the original order received.
///
/// # Examples
/// ```no_run
/// use hyper::ext::OriginalHeaderOrder;
/// use hyper::header::{HeaderName, HeaderValue, HeaderMap};
///
/// let mut h_order = OriginalHeaderOrder::default();
/// let mut h_map = Headermap::new();
///
/// let name1 = b"Set-CookiE";
/// let value1 = b"a=b";
/// h_map.append(name1);
/// h_order.append(name1);
///
/// let name2 = b"Content-Encoding";
/// let value2 = b"gzip";
/// h_map.append(name2, value2);
/// h_order.append(name2);
///
/// let name3 = b"SET-COOKIE";
/// let value3 = b"c=d";
/// h_map.append(name3, value3);
/// h_order.append(name3)
///
/// let mut iter = h_order.get_in_order()
///
/// let (name, idx) = iter.next();
/// assert_eq!(b"a=b", h_map.get_all(name).nth(idx).unwrap());
///
/// let (name, idx) = iter.next();
/// assert_eq!(b"gzip", h_map.get_all(name).nth(idx).unwrap());
///
/// let (name, idx) = iter.next();
/// assert_eq!(b"c=d", h_map.get_all(name).nth(idx).unwrap());
/// ```
pub(
crate)
fn get_in_order(&
self) ->
impl Iterator<Item = &(HeaderName, usiz
e)> {
self.entry_order.iter()
}
}