use std::fmt;
use std::future::Future;
use std::pin::Pin;
use std::task::{Context, Poll};
#[cfg(feature = "gzip")]
use async_compression::tokio::bufread::GzipDecoder;
#[cfg(feature = "brotli")]
use async_compression::tokio::bufread::BrotliDecoder;
#[cfg(feature = "deflate")]
use async_compression::tokio::bufread::ZlibDecoder;
use bytes::Bytes;
use futures_core::Stream;
use futures_util::stream::Peekable;
use http::HeaderMap;
use hyper::body::HttpBody;
#[cfg(any(feature = "gzip", feature = "brotli", feature = "deflate"))]
use tokio_util::codec::{BytesCodec, FramedRead};
#[cfg(any(feature = "gzip", feature = "brotli", feature = "deflate"))]
use tokio_util::io::StreamReader;
use super::super::Body;
use crate::error;
#[derive(Clone, Copy, Debug)]
pub(super) struct Accepts {
#[cfg(feature = "gzip")]
pub(super) gzip: bool,
#[cfg(feature = "brotli")]
pub(super) brotli: bool,
#[cfg(feature = "deflate")]
pub(super) deflate: bool,
}
pub(crate) struct Decoder {
inner: Inner,
}
type PeekableIoStream = Peekable<IoStream>;
#[cfg(any(feature = "gzip", feature = "brotli", feature = "deflate"))]
type PeekableIoStreamReader = StreamReader<PeekableIoStream, Bytes>;
enum Inner {
PlainText(super::body::ImplStream),
#[cfg(feature = "gzip")]
Gzip(Pin<Box<FramedRead<GzipDecoder<PeekableIoStreamReader>, BytesCodec>>>),
#[cfg(feature = "brotli")]
Brotli(Pin<Box<FramedRead<BrotliDecoder<PeekableIoStreamReader>, BytesCodec>>>),
#[cfg(feature = "deflate")]
Deflate(Pin<Box<FramedRead<ZlibDecoder<PeekableIoStreamReader>, BytesCodec>>>),
#[cfg(any(feature = "brotli", feature = "gzip", feature = "deflate"))]
Pending(Pin<Box<Pending>>),
}
struct Pending(PeekableIoStream, DecoderType);
struct IoStream(super::body::ImplStream);
enum DecoderType {
#[cfg(feature = "gzip")]
Gzip,
#[cfg(feature = "brotli")]
Brotli,
#[cfg(feature = "deflate")]
Deflate,
}
impl fmt::Debug for Decoder {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_struct("Decoder").finish()
}
}
impl Decoder {
#[cfg(feature = "blocking")]
pub(crate) fn empty() -> Decoder {
Decoder {
inner: Inner::PlainText(Body::empty().into_stream()),
}
}
fn plain_text(body: Body) -> Decoder {
Decoder {
inner: Inner::PlainText(body.into_stream()),
}
}
#[cfg(feature = "gzip")]
fn gzip(body: Body) -> Decoder {
use futures_util::StreamExt;
Decoder {
inner: Inner::Pending(Box::pin(Pending(
IoStream(body.into_stream()).peekable(),
DecoderType::Gzip,
))),
}
}
#[cfg(feature = "brotli")]
fn brotli(body: Body) -> Decoder {
use futures_util::StreamExt;
Decoder {
inner: Inner::Pending(Box::pin(Pending(
IoStream(body.into_stream()).peekable(),
DecoderType::Brotli,
))),
}
}
#[cfg(feature = "deflate")]
fn deflate(body: Body) -> Decoder {
use futures_util::StreamExt;
Decoder {
inner: Inner::Pending(Box::pin(Pending(
IoStream(body.into_stream()).peekable(),
DecoderType::Deflate,
))),
}
}
#[cfg(any(feature = "brotli", feature = "gzip", feature = "deflate"))]
fn detect_encoding(headers: &mut HeaderMap, encoding_str: &str) -> bool {
use http::header::{CONTENT_ENCODING, CONTENT_LENGTH, TRANSFER_ENCODING};
use log::warn;
let mut is_content_encoded = {
headers
.get_all(CONTENT_ENCODING)
.iter()
.any(|enc| enc == encoding_str)
|| headers
.get_all(TRANSFER_ENCODING)
.iter()
.any(|enc| enc == encoding_str)
};
if is_content_encoded {
if let Some(content_length) = headers.get(CONTENT_LENGTH) {
if content_length == "0" {
warn!("{encoding_str} response with content-length of 0");
is_content_encoded = false;
}
}
}
if is_content_encoded {
headers.remove(CONTENT_ENCODING);
headers.remove(CONTENT_LENGTH);
}
is_content_encoded
}
pub(super) fn detect(_headers: &mut HeaderMap, body: Body, _accepts: Accepts) -> Decoder {
#[cfg(feature = "gzip")]
{
if _accepts.gzip && Decoder::detect_encoding(_headers, "gzip") {
return Decoder::gzip(body);
}
}
#[cfg(feature = "brotli")]
{
if _accepts.brotli && Decoder::detect_encoding(_headers, "br") {
return Decoder::brotli(body);
}
}
#[cfg(feature = "deflate")]
{
if _accepts.deflate && Decoder::detect_encoding(_headers, "deflate") {
return Decoder::deflate(body);
}
}
Decoder::plain_text(body)
}
}
impl Stream for Decoder {
type Item = Result<Bytes, error::Error>;
fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
match self.inner {
#[cfg(any(feature = "brotli", feature = "gzip", feature = "deflate"))]
Inner::Pending(ref mut future) => match Pin::new(future).poll(cx) {
Poll::Ready(Ok(inner)) => {
self.inner = inner;
self.poll_next(cx)
}
Poll::Ready(Err(e)) => Poll::Ready(Some(Err(crate::error::decode_io(e)))),
Poll::Pending => Poll::Pending,
},
Inner::PlainText(ref mut body) => Pin::new(body).poll_next(cx),
#[cfg(feature = "gzip")]
Inner::Gzip(ref mut decoder) => {
match futures_core::ready!(Pin::new(decoder).poll_next(cx)) {
Some(Ok(bytes)) => Poll::Ready(Some(Ok(bytes.freeze()))),
Some(Err(err)) => Poll::Ready(Some(Err(crate::error::decode_io(err)))),
None => Poll::Ready(None),
}
}
#[cfg(feature = "brotli")]
Inner::Brotli(ref mut decoder) => {
match futures_core::ready!(Pin::new(decoder).poll_next(cx)) {
Some(Ok(bytes)) => Poll::Ready(Some(Ok(bytes.freeze()))),
Some(Err(err)) => Poll::Ready(Some(Err(crate::error::decode_io(err)))),
None => Poll::Ready(None),
}
}
#[cfg(feature = "deflate")]
Inner::Deflate(ref mut decoder) => {
match futures_core::ready!(Pin::new(decoder).poll_next(cx)) {
Some(Ok(bytes)) => Poll::Ready(Some(Ok(bytes.freeze()))),
Some(Err(err)) => Poll::Ready(Some(Err(crate::error::decode_io(err)))),
None => Poll::Ready(None),
}
}
}
}
}
impl HttpBody for Decoder {
type Data = Bytes;
type Error = crate::Error;
fn poll_data(
self: Pin<&mut Self>,
cx: &mut Context,
) -> Poll<Option<Result<Self::Data, Self::Error>>> {
self.poll_next(cx)
}
fn poll_trailers(
self: Pin<&mut Self>,
_cx: &mut Context,
) -> Poll<Result<Option<http::HeaderMap>, Self::Error>> {
Poll::Ready(Ok(None))
}
fn size_hint(&self) -> http_body::SizeHint {
match self.inner {
Inner::PlainText(ref body) => HttpBody::size_hint(body),
#[cfg(any(feature = "brotli", feature = "gzip", feature = "deflate"))]
_ => http_body::SizeHint::default(),
}
}
}
impl Future for Pending {
type Output = Result<Inner, std::io::Error>;
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
use futures_util::StreamExt;
match futures_core::ready!(Pin::new(&mut self.0).poll_peek(cx)) {
Some(Ok(_)) => {
}
Some(Err(_e)) => {
return Poll::Ready(Err(futures_core::ready!(
Pin::new(&mut self.0).poll_next(cx)
)
.expect("just peeked Some")
.unwrap_err()));
}
None => return Poll::Ready(Ok(Inner::PlainText(Body::empty().into_stream()))),
};
let _body = std::mem::replace(
&mut self.0,
IoStream(Body::empty().into_stream()).peekable(),
);
match self.1 {
#[cfg(feature = "brotli")]
DecoderType::Brotli => Poll::Ready(Ok(Inner::Brotli(Box::pin(FramedRead::new(
BrotliDecoder::new(StreamReader::new(_body)),
BytesCodec::new(),
))))),
#[cfg(feature = "gzip")]
DecoderType::Gzip => Poll::Ready(Ok(Inner::Gzip(Box::pin(FramedRead::new(
GzipDecoder::new(StreamReader::new(_body)),
BytesCodec::new(),
))))),
#[cfg(feature = "deflate")]
DecoderType::Deflate => Poll::Ready(Ok(Inner::Deflate(Box::pin(FramedRead::new(
ZlibDecoder::new(StreamReader::new(_body)),
BytesCodec::new(),
))))),
}
}
}
impl Stream for IoStream {
type Item = Result<Bytes, std::io::Error>;
fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
match futures_core::ready!(Pin::new(&mut self.0).poll_next(cx)) {
Some(Ok(chunk)) => Poll::Ready(Some(Ok(chunk))),
Some(Err(err)) => Poll::Ready(Some(Err(err.into_io()))),
None => Poll::Ready(None),
}
}
}
impl Accepts {
pub(super) fn none() -> Self {
Accepts {
#[cfg(feature = "gzip")]
gzip: false,
#[cfg(feature = "brotli")]
brotli: false,
#[cfg(feature = "deflate")]
deflate: false,
}
}
pub(super) fn as_str(&self) -> Option<&'static str> {
match (self.is_gzip(), self.is_brotli(), self.is_deflate()) {
(true, true, true) => Some("gzip, br, deflate"),
(true, true, false) => Some("gzip, br"),
(true, false, true) => Some("gzip, deflate"),
(false, true, true) => Some("br, deflate"),
(true, false, false) => Some("gzip"),
(false, true, false) => Some("br"),
(false, false, true) => Some("deflate"),
(false, false, false) => None,
}
}
fn is_gzip(&self) -> bool {
#[cfg(feature = "gzip")]
{
self.gzip
}
#[cfg(not(feature = "gzip"))]
{
false
}
}
fn is_brotli(&self) -> bool {
#[cfg(feature = "brotli")]
{
self.brotli
}
#[cfg(not(feature = "brotli"))]
{
false
}
}
fn is_deflate(&self) -> bool {
#[cfg(feature = "deflate")]
{
self.deflate
}
#[cfg(not(feature = "deflate"))]
{
false
}
}
}
impl Default for Accepts {
fn default() -> Accepts {
Accepts {
#[cfg(feature = "gzip")]
gzip: true,
#[cfg(feature = "brotli")]
brotli: true,
#[cfg(feature = "deflate")]
deflate: true,
}
}
}