From fe3f1d550b097aa580ed02a18b48106d27d74911 Mon Sep 17 00:00:00 2001 From: Jacob Hoffman-Andrews Date: Sat, 26 Nov 2022 12:58:26 -0800 Subject: [PATCH] Fork chunked_transfer crate --- src/chunked/LICENSE | 201 +++++++++++++++++++++++++++ src/chunked/decoder.rs | 305 +++++++++++++++++++++++++++++++++++++++++ src/chunked/encoder.rs | 212 ++++++++++++++++++++++++++++ src/chunked/lib.rs | 20 +++ 4 files changed, 738 insertions(+) create mode 100644 src/chunked/LICENSE create mode 100644 src/chunked/decoder.rs create mode 100644 src/chunked/encoder.rs create mode 100644 src/chunked/lib.rs diff --git a/src/chunked/LICENSE b/src/chunked/LICENSE new file mode 100644 index 0000000..16fe87b --- /dev/null +++ b/src/chunked/LICENSE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + +TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + +1. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + +Copyright [yyyy] [name of copyright owner] + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. diff --git a/src/chunked/decoder.rs b/src/chunked/decoder.rs new file mode 100644 index 0000000..bf6f61e --- /dev/null +++ b/src/chunked/decoder.rs @@ -0,0 +1,305 @@ +// Copyright 2015 The tiny-http Contributors +// Copyright 2015 The rust-chunked-transfer Contributors +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +use std::error::Error; +use std::fmt; +use std::io::Error as IoError; +use std::io::ErrorKind; +use std::io::Read; +use std::io::Result as IoResult; + +/// Reads HTTP chunks and sends back real data. +/// +/// # Example +/// +/// ``` +/// use chunked_transfer::Decoder; +/// use std::io::Read; +/// +/// let encoded = b"3\r\nhel\r\nb\r\nlo world!!!\r\n0\r\n\r\n"; +/// let mut decoded = String::new(); +/// +/// let mut decoder = Decoder::new(encoded as &[u8]); +/// decoder.read_to_string(&mut decoded); +/// +/// assert_eq!(decoded, "hello world!!!"); +/// ``` +pub struct Decoder { + // where the chunks come from + source: R, + + // remaining size of the chunk being read + // none if we are not in a chunk + remaining_chunks_size: Option, +} + +impl Decoder +where + R: Read, +{ + pub fn new(source: R) -> Decoder { + Decoder { + source, + remaining_chunks_size: None, + } + } + + /// Returns the remaining bytes left in the chunk being read. + pub fn remaining_chunks_size(&self) -> Option { + self.remaining_chunks_size + } + + /// Unwraps the Decoder into its inner `Read` source. + pub fn into_inner(self) -> R { + self.source + } + + fn read_chunk_size(&mut self) -> IoResult { + let mut chunk_size_bytes = Vec::new(); + let mut has_ext = false; + + loop { + let byte = match self.source.by_ref().bytes().next() { + Some(b) => b?, + None => return Err(IoError::new(ErrorKind::InvalidInput, DecoderError)), + }; + + if byte == b'\r' { + break; + } + + if byte == b';' { + has_ext = true; + break; + } + + chunk_size_bytes.push(byte); + } + + // Ignore extensions for now + if has_ext { + loop { + let byte = match self.source.by_ref().bytes().next() { + Some(b) => b?, + None => return Err(IoError::new(ErrorKind::InvalidInput, DecoderError)), + }; + if byte == b'\r' { + break; + } + } + } + + self.read_line_feed()?; + + let chunk_size = String::from_utf8(chunk_size_bytes) + .ok() + .and_then(|c| usize::from_str_radix(c.trim(), 16).ok()) + .ok_or_else(|| IoError::new(ErrorKind::InvalidInput, DecoderError))?; + + Ok(chunk_size) + } + + fn read_carriage_return(&mut self) -> IoResult<()> { + match self.source.by_ref().bytes().next() { + Some(Ok(b'\r')) => Ok(()), + _ => Err(IoError::new(ErrorKind::InvalidInput, DecoderError)), + } + } + + fn read_line_feed(&mut self) -> IoResult<()> { + match self.source.by_ref().bytes().next() { + Some(Ok(b'\n')) => Ok(()), + _ => Err(IoError::new(ErrorKind::InvalidInput, DecoderError)), + } + } +} + +impl Read for Decoder +where + R: Read, +{ + fn read(&mut self, buf: &mut [u8]) -> IoResult { + let remaining_chunks_size = match self.remaining_chunks_size { + Some(c) => c, + None => { + // first possibility: we are not in a chunk, so we'll attempt to determine + // the chunks size + let chunk_size = self.read_chunk_size()?; + + // if the chunk size is 0, we are at EOF + if chunk_size == 0 { + self.read_carriage_return()?; + self.read_line_feed()?; + return Ok(0); + } + + chunk_size + } + }; + + // second possibility: we continue reading from a chunk + if buf.len() < remaining_chunks_size { + let read = self.source.read(buf)?; + self.remaining_chunks_size = Some(remaining_chunks_size - read); + return Ok(read); + } + + // third possibility: the read request goes further than the current chunk + // we simply read until the end of the chunk and return + assert!(buf.len() >= remaining_chunks_size); + + let buf = &mut buf[..remaining_chunks_size]; + let read = self.source.read(buf)?; + + self.remaining_chunks_size = if read == remaining_chunks_size { + self.read_carriage_return()?; + self.read_line_feed()?; + None + } else { + Some(remaining_chunks_size - read) + }; + + Ok(read) + } +} + +#[derive(Debug, Copy, Clone)] +struct DecoderError; + +impl fmt::Display for DecoderError { + fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> { + write!(fmt, "Error while decoding chunks") + } +} + +impl Error for DecoderError { + fn description(&self) -> &str { + "Error while decoding chunks" + } +} + +#[cfg(test)] +mod test { + use super::Decoder; + use std::io; + use std::io::Read; + + /// This unit test is taken from from Hyper + /// https://github.com/hyperium/hyper + /// Copyright (c) 2014 Sean McArthur + #[test] + fn test_read_chunk_size() { + fn read(s: &str, expected: usize) { + let mut decoded = Decoder::new(s.as_bytes()); + let actual = decoded.read_chunk_size().unwrap(); + assert_eq!(expected, actual); + } + + fn read_err(s: &str) { + let mut decoded = Decoder::new(s.as_bytes()); + let err_kind = decoded.read_chunk_size().unwrap_err().kind(); + assert_eq!(err_kind, io::ErrorKind::InvalidInput); + } + + read("1\r\n", 1); + read("01\r\n", 1); + read("0\r\n", 0); + read("00\r\n", 0); + read("A\r\n", 10); + read("a\r\n", 10); + read("Ff\r\n", 255); + read("Ff \r\n", 255); + // Missing LF or CRLF + read_err("F\rF"); + read_err("F"); + // Invalid hex digit + read_err("X\r\n"); + read_err("1X\r\n"); + read_err("-\r\n"); + read_err("-1\r\n"); + // Acceptable (if not fully valid) extensions do not influence the size + read("1;extension\r\n", 1); + read("a;ext name=value\r\n", 10); + read("1;extension;extension2\r\n", 1); + read("1;;; ;\r\n", 1); + read("2; extension...\r\n", 2); + read("3 ; extension=123\r\n", 3); + read("3 ;\r\n", 3); + read("3 ; \r\n", 3); + // Invalid extensions cause an error + read_err("1 invalid extension\r\n"); + read_err("1 A\r\n"); + read_err("1;no CRLF"); + } + + #[test] + fn test_valid_chunk_decode() { + let source = io::Cursor::new( + "3\r\nhel\r\nb\r\nlo world!!!\r\n0\r\n\r\n" + .to_string() + .into_bytes(), + ); + let mut decoded = Decoder::new(source); + + let mut string = String::new(); + decoded.read_to_string(&mut string).unwrap(); + + assert_eq!(string, "hello world!!!"); + } + + #[test] + fn test_decode_zero_length() { + let mut decoder = Decoder::new(b"0\r\n\r\n" as &[u8]); + + let mut decoded = String::new(); + decoder.read_to_string(&mut decoded).unwrap(); + + assert_eq!(decoded, ""); + } + + #[test] + fn test_decode_invalid_chunk_length() { + let mut decoder = Decoder::new(b"m\r\n\r\n" as &[u8]); + + let mut decoded = String::new(); + assert!(decoder.read_to_string(&mut decoded).is_err()); + } + + #[test] + fn invalid_input1() { + let source = io::Cursor::new( + "2\r\nhel\r\nb\r\nlo world!!!\r\n0\r\n" + .to_string() + .into_bytes(), + ); + let mut decoded = Decoder::new(source); + + let mut string = String::new(); + assert!(decoded.read_to_string(&mut string).is_err()); + } + + #[test] + fn invalid_input2() { + let source = io::Cursor::new( + "3\rhel\r\nb\r\nlo world!!!\r\n0\r\n" + .to_string() + .into_bytes(), + ); + let mut decoded = Decoder::new(source); + + let mut string = String::new(); + assert!(decoded.read_to_string(&mut string).is_err()); + } +} diff --git a/src/chunked/encoder.rs b/src/chunked/encoder.rs new file mode 100644 index 0000000..ef4172c --- /dev/null +++ b/src/chunked/encoder.rs @@ -0,0 +1,212 @@ +// Copyright 2015 The tiny-http Contributors +// Copyright 2015 The rust-chunked-transfer Contributors +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +use std::io::Result as IoResult; +use std::io::Write; + +/// Splits the incoming data into HTTP chunks. +/// +/// # Example +/// +/// ``` +/// use chunked_transfer::Encoder; +/// use std::io::Write; +/// +/// let mut decoded = "hello world"; +/// let mut encoded: Vec = vec![]; +/// +/// { +/// let mut encoder = Encoder::with_chunks_size(&mut encoded, 5); +/// encoder.write_all(decoded.as_bytes()); +/// } +/// +/// assert_eq!(encoded, b"5\r\nhello\r\n5\r\n worl\r\n1\r\nd\r\n0\r\n\r\n"); +/// ``` +pub struct Encoder +where + W: Write, +{ + // where to send the result + output: W, + + // size of each chunk + chunks_size: usize, + + // data waiting to be sent is stored here + // This will always be at least 6 bytes long. The first 6 bytes + // are reserved for the chunk size and \r\n. + buffer: Vec, + + // Flushes the internal buffer after each write. This might be useful + // if data should be sent immediately to downstream consumers + flush_after_write: bool, +} + +const MAX_CHUNK_SIZE: usize = std::u32::MAX as usize; +// This accounts for four hex digits (enough to hold a u32) plus two bytes +// for the \r\n +const MAX_HEADER_SIZE: usize = 6; + +impl Encoder +where + W: Write, +{ + pub fn new(output: W) -> Encoder { + Encoder::with_chunks_size(output, 8192) + } + + pub fn with_chunks_size(output: W, chunks: usize) -> Encoder { + let chunks_size = chunks.min(MAX_CHUNK_SIZE); + let mut encoder = Encoder { + output, + chunks_size, + buffer: vec![0; MAX_HEADER_SIZE], + flush_after_write: false, + }; + encoder.reset_buffer(); + encoder + } + + pub fn with_flush_after_write(output: W) -> Encoder { + let mut encoder = Encoder { + output, + chunks_size: 8192, + buffer: vec![0; MAX_HEADER_SIZE], + flush_after_write: true, + }; + encoder.reset_buffer(); + encoder + } + + fn reset_buffer(&mut self) { + // Reset buffer, still leaving space for the chunk size. That space + // will be populated once we know the size of the chunk. + self.buffer.truncate(MAX_HEADER_SIZE); + } + + fn is_buffer_empty(&self) -> bool { + self.buffer.len() == MAX_HEADER_SIZE + } + + fn buffer_len(&self) -> usize { + self.buffer.len() - MAX_HEADER_SIZE + } + + fn send(&mut self) -> IoResult<()> { + // Never send an empty buffer, because that would be interpreted + // as the end of the stream, which we indicate explicitly on drop. + if self.is_buffer_empty() { + return Ok(()); + } + // Prepend the length and \r\n to the buffer. + let prelude = format!("{:x}\r\n", self.buffer_len()); + let prelude = prelude.as_bytes(); + + // This should never happen because MAX_CHUNK_SIZE of u32::MAX + // can always be encoded in 4 hex bytes. + assert!( + prelude.len() <= MAX_HEADER_SIZE, + "invariant failed: prelude longer than MAX_HEADER_SIZE" + ); + + // Copy the prelude into the buffer. For small chunks, this won't necessarily + // take up all the space that was reserved for the prelude. + let offset = MAX_HEADER_SIZE - prelude.len(); + self.buffer[offset..MAX_HEADER_SIZE].clone_from_slice(&prelude); + + // Append the chunk-finishing \r\n to the buffer. + self.buffer.write_all(b"\r\n")?; + + self.output.write_all(&self.buffer[offset..])?; + self.reset_buffer(); + + Ok(()) + } +} + +impl Write for Encoder +where + W: Write, +{ + fn write(&mut self, data: &[u8]) -> IoResult { + let remaining_buffer_space = self.chunks_size - self.buffer_len(); + let bytes_to_buffer = std::cmp::min(remaining_buffer_space, data.len()); + self.buffer.extend_from_slice(&data[0..bytes_to_buffer]); + let more_to_write: bool = bytes_to_buffer < data.len(); + if self.flush_after_write || more_to_write { + self.send()?; + } + + // If we didn't write the whole thing, keep working on it. + if more_to_write { + self.write_all(&data[bytes_to_buffer..])?; + } + Ok(data.len()) + } + + fn flush(&mut self) -> IoResult<()> { + self.send() + } +} + +impl Drop for Encoder +where + W: Write, +{ + fn drop(&mut self) { + self.flush().ok(); + write!(self.output, "0\r\n\r\n").ok(); + } +} + +#[cfg(test)] +mod test { + use super::Encoder; + use std::io; + use std::io::Write; + use std::str::from_utf8; + + #[test] + fn test() { + let mut source = io::Cursor::new("hello world".to_string().into_bytes()); + let mut dest: Vec = vec![]; + + { + let mut encoder = Encoder::with_chunks_size(dest.by_ref(), 5); + io::copy(&mut source, &mut encoder).unwrap(); + assert!(!encoder.is_buffer_empty()); + } + + let output = from_utf8(&dest).unwrap(); + + assert_eq!(output, "5\r\nhello\r\n5\r\n worl\r\n1\r\nd\r\n0\r\n\r\n"); + } + #[test] + fn flush_after_write() { + let mut source = io::Cursor::new("hello world".to_string().into_bytes()); + let mut dest: Vec = vec![]; + + { + let mut encoder = Encoder::with_flush_after_write(dest.by_ref()); + io::copy(&mut source, &mut encoder).unwrap(); + // The internal buffer has been flushed. + assert!(encoder.is_buffer_empty()); + } + + let output = from_utf8(&dest).unwrap(); + + assert_eq!(output, "b\r\nhello world\r\n0\r\n\r\n"); + } +} diff --git a/src/chunked/lib.rs b/src/chunked/lib.rs new file mode 100644 index 0000000..1e0ac9d --- /dev/null +++ b/src/chunked/lib.rs @@ -0,0 +1,20 @@ +// Copyright 2015 The tiny-http Contributors +// Copyright 2015 The rust-chunked-transfer Contributors +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +mod decoder; +pub use crate::decoder::Decoder; + +mod encoder; +pub use crate::encoder::Encoder;