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use crate::{Body, MutCow};
use encoding_rs::Encoding;
use futures_lite::{io, ready, AsyncRead, AsyncReadExt, AsyncWrite, Stream};
use httparse::Status;
use std::{
convert::TryInto,
fmt::{self, Formatter},
io::ErrorKind,
iter,
pin::Pin,
task::{Context, Poll},
};
use Poll::{Pending, Ready};
use ReceivedBodyState::{Chunked, End, FixedLength, Start};
macro_rules! trace {
($s:literal, $($arg:tt)+) => (
log::trace!(concat!(":{} ", $s), line!(), $($arg)+);
)
}
pub struct ReceivedBody<'conn, Transport> {
content_length: Option<u64>,
buffer: MutCow<'conn, Option<Vec<u8>>>,
transport: Option<MutCow<'conn, Transport>>,
state: MutCow<'conn, ReceivedBodyState>,
on_completion: Option<Box<dyn Fn(Transport) + Send + Sync + 'static>>,
encoding: &'static Encoding,
}
impl<'conn, Transport> ReceivedBody<'conn, Transport>
where
Transport: AsyncRead + Unpin + Send + Sync + 'static,
{
#[allow(missing_docs)]
#[doc(hidden)]
pub fn new(
content_length: Option<u64>,
buffer: impl Into<MutCow<'conn, Option<Vec<u8>>>>,
transport: impl Into<MutCow<'conn, Transport>>,
state: impl Into<MutCow<'conn, ReceivedBodyState>>,
on_completion: Option<Box<dyn Fn(Transport) + Send + Sync + 'static>>,
encoding: &'static Encoding,
) -> Self {
Self {
content_length,
buffer: buffer.into(),
transport: Some(transport.into()),
state: state.into(),
on_completion,
encoding,
}
}
pub fn content_length(&self) -> Option<u64> {
self.content_length
}
#[allow(clippy::missing_errors_doc)] pub async fn read_string(self) -> crate::Result<String> {
let encoding = self.encoding();
let bytes = self.read_bytes().await?;
let (s, _, _) = encoding.decode(&bytes);
Ok(s.to_string())
}
fn owns_transport(&self) -> bool {
self.transport
.as_ref()
.map(MutCow::is_owned)
.unwrap_or_default()
}
#[allow(clippy::missing_errors_doc)] pub async fn read_bytes(mut self) -> crate::Result<Vec<u8>> {
let mut vec = if let Some(len) = self.content_length {
Vec::with_capacity(len.try_into().unwrap_or(usize::max_value()))
} else {
Vec::new()
};
self.read_to_end(&mut vec).await?;
Ok(vec)
}
pub fn encoding(&self) -> &'static Encoding {
self.encoding
}
fn read_raw(&mut self, cx: &mut Context<'_>, buf: &mut [u8]) -> Poll<io::Result<usize>> {
if let Some(transport) = self.transport.as_mut() {
read_raw(&mut self.buffer, &mut **transport, cx, buf)
} else {
Ready(Err(ErrorKind::NotConnected.into()))
}
}
#[allow(clippy::missing_errors_doc)] pub async fn drain(self) -> io::Result<u64> {
io::copy(self, io::sink()).await
}
}
impl<T> ReceivedBody<'static, T> {
pub fn take_transport(&mut self) -> Option<T> {
self.transport.take().map(MutCow::unwrap_owned)
}
}
fn read_raw<Transport>(
opt_buffer: &mut Option<Vec<u8>>,
transport: &mut Transport,
cx: &mut Context<'_>,
buf: &mut [u8],
) -> Poll<io::Result<usize>>
where
Transport: AsyncRead + Unpin + Send + Sync + 'static,
{
match opt_buffer {
Some(buffer) if !buffer.is_empty() => {
let len = buffer.len();
if len > buf.len() {
trace!(
"have {} bytes of pending data but can only use {}",
len,
buf.len()
);
let remaining = buffer.split_off(buf.len());
buf.copy_from_slice(buffer);
*buffer = remaining;
Ready(Ok(buf.len()))
} else {
trace!("have {} bytes of pending data, using all of it", len);
buf[..len].copy_from_slice(buffer);
*opt_buffer = None;
match Pin::new(transport).poll_read(cx, &mut buf[len..]) {
Ready(Ok(e)) => Ready(Ok(e + len)),
Pending => Ready(Ok(len)),
other @ Ready(_) => other,
}
}
}
_ => Pin::new(transport).poll_read(cx, buf),
}
}
#[allow(
clippy::only_used_in_recursion,
clippy::cast_possible_truncation
)]
fn chunk_decode(
remaining: usize,
mut total: usize,
buf: &mut [u8],
) -> io::Result<(ReceivedBodyState, usize, Option<Vec<u8>>)> {
let mut ranges_to_keep = vec![];
let mut chunk_start = 0;
let mut chunk_end = remaining;
let (request_body_state, unused) = loop {
if chunk_end > 2 {
let keep_end = buf.len().min(chunk_end - 2);
ranges_to_keep.push(chunk_start..keep_end);
total += keep_end - chunk_start;
}
chunk_start = chunk_end;
if chunk_start >= buf.len() {
break (
Chunked {
remaining: (chunk_start - buf.len()),
total,
},
None,
);
}
match httparse::parse_chunk_size(&buf[chunk_start..]) {
Ok(Status::Complete((framing_bytes, chunk_size))) => {
chunk_start += framing_bytes;
chunk_end = 2 + chunk_start + chunk_size as usize;
if chunk_size == 0 {
break (
End,
if chunk_end < buf.len() {
Some(buf[chunk_end..].to_vec())
} else {
None
},
);
}
}
Ok(Status::Partial) => {
break (
Chunked {
remaining: 0,
total,
},
if chunk_start < buf.len() {
Some(buf[chunk_start..].to_vec())
} else {
None
},
);
}
Err(httparse::InvalidChunkSize) => {
return Err(io::Error::new(
io::ErrorKind::InvalidData,
"invalid chunk size",
));
}
}
};
let mut bytes = 0;
for range_to_keep in ranges_to_keep {
let new_bytes = bytes + range_to_keep.end - range_to_keep.start;
buf.copy_within(range_to_keep, bytes);
bytes = new_bytes;
}
Ok((request_body_state, bytes, unused))
}
const STREAM_READ_BUF_LENGTH: usize = 128;
impl<'conn, Transport> Stream for ReceivedBody<'conn, Transport>
where
Transport: AsyncRead + Unpin + Send + Sync + 'static,
{
type Item = Vec<u8>;
fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
let mut bytes = 0;
let mut vec = vec![0; STREAM_READ_BUF_LENGTH];
loop {
match Pin::new(&mut *self).poll_read(cx, &mut vec[bytes..]) {
Pending if bytes == 0 => return Pending,
Ready(Ok(0)) if bytes == 0 => return Ready(None),
Pending | Ready(Ok(0)) => {
vec.truncate(bytes);
return Ready(Some(vec));
}
Ready(Ok(new_bytes)) => {
bytes += new_bytes;
vec.extend(iter::repeat(0).take(bytes + STREAM_READ_BUF_LENGTH - vec.len()));
}
Ready(Err(error)) => {
log::error!("got {error:?} in ReceivedBody stream");
return Ready(None);
}
}
}
}
}
impl<'conn, Transport> AsyncRead for ReceivedBody<'conn, Transport>
where
Transport: AsyncRead + Unpin + Send + Sync + 'static,
{
#[allow(clippy::cast_possible_truncation)]
fn poll_read(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &mut [u8],
) -> Poll<io::Result<usize>> {
trace!("polling received body with state {:?}", &*self.state);
let (new_body_state, bytes, unused) = match *self.state {
Start => (
match self.content_length {
Some(0) => End,
Some(total_length) => FixedLength {
current_index: 0,
total_length,
},
None => Chunked {
remaining: 0,
total: 0,
},
},
0,
None,
),
Chunked { remaining, total } => {
let bytes = ready!(self.read_raw(cx, buf)?);
chunk_decode(remaining, total, &mut buf[..bytes])?
}
FixedLength {
current_index,
total_length,
} => {
let len = buf.len();
let remaining = (total_length - current_index) as usize;
let buf = &mut buf[..len.min(remaining)];
let bytes = ready!(self.read_raw(cx, buf)?);
let current_index = current_index + bytes as u64;
let state = if bytes == 0 || current_index == total_length {
End
} else {
FixedLength {
current_index,
total_length,
}
};
(state, bytes, None)
}
End => (End, 0, None),
};
if let Some(unused) = unused {
if let Some(existing) = &mut *self.buffer {
existing.extend_from_slice(&unused);
} else {
*self.buffer = Some(unused);
}
}
*self.state = new_body_state;
if *self.state == End {
if self.on_completion.is_some() && self.owns_transport() {
let transport = self.transport.take().unwrap().unwrap_owned();
let on_completion = self.on_completion.take().unwrap();
on_completion(transport);
}
Ready(Ok(bytes))
} else if bytes == 0 {
cx.waker().wake_by_ref();
Pending
} else {
Ready(Ok(bytes))
}
}
}
impl<'conn, Transport> fmt::Debug for ReceivedBody<'conn, Transport> {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
f.debug_struct("RequestBody")
.field("state", &*self.state)
.field("content_length", &self.content_length)
.field(
"buffer",
&self.buffer.as_deref().map(String::from_utf8_lossy),
)
.field("on_completion", &self.on_completion.is_some())
.finish()
}
}
#[derive(Debug, Clone, Copy, Eq, PartialEq)]
pub enum ReceivedBodyState {
Start,
Chunked {
remaining: usize,
total: usize,
},
FixedLength {
current_index: u64,
total_length: u64,
},
End,
}
impl Default for ReceivedBodyState {
fn default() -> Self {
Start
}
}
impl<Transport> From<ReceivedBody<'static, Transport>> for Body
where
Transport: AsyncRead + AsyncWrite + Send + Sync + Unpin + 'static,
{
fn from(rb: ReceivedBody<'static, Transport>) -> Self {
let len = rb.content_length.map(|cl| cl as u64);
Body::new_streaming(rb, len)
}
}
#[cfg(test)]
mod chunk_decode {
use super::{chunk_decode, ReceivedBody, ReceivedBodyState};
use encoding_rs::UTF_8;
use futures_lite::{io::Cursor, AsyncRead, AsyncReadExt};
fn assert_decoded(input: (usize, &str), expected_output: (Option<usize>, &str, Option<&str>)) {
let (remaining, input_data) = input;
let mut buf = input_data.to_string().into_bytes();
let (output_state, bytes, unused) = chunk_decode(remaining, 0, &mut buf).unwrap();
assert_eq!(
(
match output_state {
ReceivedBodyState::Chunked { remaining, .. } => Some(remaining),
ReceivedBodyState::End => None,
_ => panic!("unexpected output state {:?}", output_state),
},
&*String::from_utf8_lossy(&buf[0..bytes]),
unused.as_deref().map(String::from_utf8_lossy).as_deref()
),
expected_output
);
}
async fn read_with_buffers_of_size<R>(reader: &mut R, size: usize) -> crate::Result<String>
where
R: AsyncRead + Unpin,
{
let mut return_buffer = vec![];
loop {
let mut buf = vec![0; size];
match reader.read(&mut buf).await? {
0 => break Ok(String::from_utf8_lossy(&return_buffer).into()),
bytes_read => return_buffer.extend_from_slice(&buf[..bytes_read]),
}
}
}
fn full_decode_with_size(
input: &str,
poll_size: usize,
) -> crate::Result<(String, ReceivedBody<'static, Cursor<&str>>)> {
let mut rb = ReceivedBody::new(
None,
None,
Cursor::new(input),
ReceivedBodyState::Chunked {
remaining: 0,
total: 0,
},
None,
UTF_8,
);
let output = trillium_testing::block_on(read_with_buffers_of_size(&mut rb, poll_size))?;
Ok((output, rb))
}
#[test]
fn test_full_decode() {
env_logger::try_init().ok();
for size in 3..50 {
let input = "5\r\n12345\r\n1\r\na\r\n2\r\nbc\r\n3\r\ndef\r\n0\r\n";
let (output, _) = full_decode_with_size(input, size).unwrap();
assert_eq!(output, "12345abcdef", "size: {}", size);
let input = "7\r\nMozilla\r\n9\r\nDeveloper\r\n7\r\nNetwork\r\n0\r\n\r\n";
let (output, _) = full_decode_with_size(input, size).unwrap();
assert_eq!(output, "MozillaDeveloperNetwork", "size: {}", size);
}
}
#[test]
fn test_chunk_start() {
assert_decoded((0, "5\r\n12345\r\n"), (Some(0), "12345", None));
assert_decoded((0, "F\r\n1"), (Some(14 + 2), "1", None));
assert_decoded((0, "5\r\n123"), (Some(2 + 2), "123", None));
assert_decoded((0, "1\r\nX\r\n1\r\nX\r\n"), (Some(0), "XX", None));
assert_decoded((0, "1\r\nX\r\n1\r\nX\r\n1"), (Some(0), "XX", Some("1")));
assert_decoded((0, "FFF\r\n"), (Some(0xfff + 2), "", None));
assert_decoded((10, "hello"), (Some(5), "hello", None));
assert_decoded(
(7, "hello\r\nA\r\n world"),
(Some(4 + 2), "hello world", None),
);
assert_decoded(
(0, "e\r\ntest test test\r\n0\r\n\r\n"),
(None, "test test test", None),
);
assert_decoded(
(0, "1\r\n_\r\n0\r\n\r\nnext request"),
(None, "_", Some("next request")),
);
assert_decoded((7, "hello\r\n0\r\n\r\n"), (None, "hello", None));
}
}