mirror of
https://github.com/fafhrd91/actix-web
synced 2024-11-24 08:22:59 +01:00
789 lines
26 KiB
Rust
789 lines
26 KiB
Rust
//! Multipart requests support
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use std::cell::RefCell;
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use std::marker::PhantomData;
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use std::rc::Rc;
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use std::{cmp, fmt};
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use bytes::Bytes;
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use futures::task::{current as current_task, Task};
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use futures::{Async, Poll, Stream};
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use http::HttpTryFrom;
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use http::header::{self, HeaderMap, HeaderName, HeaderValue};
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use httparse;
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use mime;
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use error::{MultipartError, ParseError, PayloadError};
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use payload::PayloadHelper;
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const MAX_HEADERS: usize = 32;
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/// The server-side implementation of `multipart/form-data` requests.
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///
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/// This will parse the incoming stream into `MultipartItem` instances via its
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/// Stream implementation.
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/// `MultipartItem::Field` contains multipart field. `MultipartItem::Multipart`
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/// is used for nested multipart streams.
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pub struct Multipart<S> {
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safety: Safety,
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error: Option<MultipartError>,
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inner: Option<Rc<RefCell<InnerMultipart<S>>>>,
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}
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///
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pub enum MultipartItem<S> {
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/// Multipart field
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Field(Field<S>),
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/// Nested multipart stream
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Nested(Multipart<S>),
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}
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enum InnerMultipartItem<S> {
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None,
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Field(Rc<RefCell<InnerField<S>>>),
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Multipart(Rc<RefCell<InnerMultipart<S>>>),
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}
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#[derive(PartialEq, Debug)]
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enum InnerState {
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/// Stream eof
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Eof,
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/// Skip data until first boundary
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FirstBoundary,
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/// Reading boundary
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Boundary,
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/// Reading Headers,
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Headers,
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}
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struct InnerMultipart<S> {
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payload: PayloadRef<S>,
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boundary: String,
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state: InnerState,
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item: InnerMultipartItem<S>,
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}
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impl Multipart<()> {
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/// Extract boundary info from headers.
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pub fn boundary(headers: &HeaderMap) -> Result<String, MultipartError> {
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if let Some(content_type) = headers.get(header::CONTENT_TYPE) {
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if let Ok(content_type) = content_type.to_str() {
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if let Ok(ct) = content_type.parse::<mime::Mime>() {
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if let Some(boundary) = ct.get_param(mime::BOUNDARY) {
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Ok(boundary.as_str().to_owned())
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} else {
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Err(MultipartError::Boundary)
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}
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} else {
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Err(MultipartError::ParseContentType)
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}
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} else {
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Err(MultipartError::ParseContentType)
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}
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} else {
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Err(MultipartError::NoContentType)
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}
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}
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}
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impl<S> Multipart<S>
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where
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S: Stream<Item = Bytes, Error = PayloadError>,
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{
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/// Create multipart instance for boundary.
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pub fn new(boundary: Result<String, MultipartError>, stream: S) -> Multipart<S> {
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match boundary {
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Ok(boundary) => Multipart {
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error: None,
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safety: Safety::new(),
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inner: Some(Rc::new(RefCell::new(InnerMultipart {
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boundary,
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payload: PayloadRef::new(PayloadHelper::new(stream)),
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state: InnerState::FirstBoundary,
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item: InnerMultipartItem::None,
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}))),
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},
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Err(err) => Multipart {
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error: Some(err),
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safety: Safety::new(),
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inner: None,
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},
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}
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}
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}
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impl<S> Stream for Multipart<S>
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where
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S: Stream<Item = Bytes, Error = PayloadError>,
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{
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type Item = MultipartItem<S>;
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type Error = MultipartError;
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fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
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if let Some(err) = self.error.take() {
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Err(err)
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} else if self.safety.current() {
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self.inner
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.as_mut()
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.unwrap()
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.borrow_mut()
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.poll(&self.safety)
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} else {
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Ok(Async::NotReady)
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}
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}
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}
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impl<S> InnerMultipart<S>
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where
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S: Stream<Item = Bytes, Error = PayloadError>,
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{
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fn read_headers(payload: &mut PayloadHelper<S>) -> Poll<HeaderMap, MultipartError> {
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match payload.read_until(b"\r\n\r\n")? {
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Async::NotReady => Ok(Async::NotReady),
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Async::Ready(None) => Err(MultipartError::Incomplete),
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Async::Ready(Some(bytes)) => {
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let mut hdrs = [httparse::EMPTY_HEADER; MAX_HEADERS];
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match httparse::parse_headers(&bytes, &mut hdrs) {
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Ok(httparse::Status::Complete((_, hdrs))) => {
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// convert headers
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let mut headers = HeaderMap::with_capacity(hdrs.len());
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for h in hdrs {
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if let Ok(name) = HeaderName::try_from(h.name) {
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if let Ok(value) = HeaderValue::try_from(h.value) {
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headers.append(name, value);
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} else {
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return Err(ParseError::Header.into());
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}
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} else {
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return Err(ParseError::Header.into());
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}
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}
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Ok(Async::Ready(headers))
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}
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Ok(httparse::Status::Partial) => Err(ParseError::Header.into()),
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Err(err) => Err(ParseError::from(err).into()),
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}
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}
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}
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}
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fn read_boundary(
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payload: &mut PayloadHelper<S>, boundary: &str
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) -> Poll<bool, MultipartError> {
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// TODO: need to read epilogue
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match payload.readline()? {
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Async::NotReady => Ok(Async::NotReady),
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Async::Ready(None) => Err(MultipartError::Incomplete),
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Async::Ready(Some(chunk)) => {
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if chunk.len() == boundary.len() + 4 && &chunk[..2] == b"--"
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&& &chunk[2..boundary.len() + 2] == boundary.as_bytes()
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{
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Ok(Async::Ready(false))
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} else if chunk.len() == boundary.len() + 6 && &chunk[..2] == b"--"
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&& &chunk[2..boundary.len() + 2] == boundary.as_bytes()
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&& &chunk[boundary.len() + 2..boundary.len() + 4] == b"--"
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{
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Ok(Async::Ready(true))
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} else {
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Err(MultipartError::Boundary)
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}
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}
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}
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}
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fn skip_until_boundary(
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payload: &mut PayloadHelper<S>, boundary: &str
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) -> Poll<bool, MultipartError> {
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let mut eof = false;
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loop {
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match payload.readline()? {
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Async::Ready(Some(chunk)) => {
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if chunk.is_empty() {
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//ValueError("Could not find starting boundary %r"
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//% (self._boundary))
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}
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if chunk.len() < boundary.len() {
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continue;
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}
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if &chunk[..2] == b"--"
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&& &chunk[2..chunk.len() - 2] == boundary.as_bytes()
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{
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break;
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} else {
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if chunk.len() < boundary.len() + 2 {
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continue;
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}
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let b: &[u8] = boundary.as_ref();
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if &chunk[..boundary.len()] == b
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&& &chunk[boundary.len()..boundary.len() + 2] == b"--"
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{
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eof = true;
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break;
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}
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}
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}
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Async::NotReady => return Ok(Async::NotReady),
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Async::Ready(None) => return Err(MultipartError::Incomplete),
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}
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}
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Ok(Async::Ready(eof))
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}
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fn poll(
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&mut self, safety: &Safety
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) -> Poll<Option<MultipartItem<S>>, MultipartError> {
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if self.state == InnerState::Eof {
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Ok(Async::Ready(None))
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} else {
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// release field
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loop {
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// Nested multipart streams of fields has to be consumed
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// before switching to next
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if safety.current() {
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let stop = match self.item {
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InnerMultipartItem::Field(ref mut field) => {
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match field.borrow_mut().poll(safety)? {
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Async::NotReady => return Ok(Async::NotReady),
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Async::Ready(Some(_)) => continue,
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Async::Ready(None) => true,
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}
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}
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InnerMultipartItem::Multipart(ref mut multipart) => {
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match multipart.borrow_mut().poll(safety)? {
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Async::NotReady => return Ok(Async::NotReady),
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Async::Ready(Some(_)) => continue,
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Async::Ready(None) => true,
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}
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}
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_ => false,
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};
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if stop {
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self.item = InnerMultipartItem::None;
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}
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if let InnerMultipartItem::None = self.item {
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break;
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}
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}
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}
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let headers = if let Some(payload) = self.payload.get_mut(safety) {
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match self.state {
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// read until first boundary
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InnerState::FirstBoundary => {
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match InnerMultipart::skip_until_boundary(
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payload,
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&self.boundary,
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)? {
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Async::Ready(eof) => {
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if eof {
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self.state = InnerState::Eof;
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return Ok(Async::Ready(None));
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} else {
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self.state = InnerState::Headers;
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}
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}
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Async::NotReady => return Ok(Async::NotReady),
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}
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}
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// read boundary
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InnerState::Boundary => {
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match InnerMultipart::read_boundary(payload, &self.boundary)? {
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Async::NotReady => return Ok(Async::NotReady),
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Async::Ready(eof) => {
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if eof {
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self.state = InnerState::Eof;
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return Ok(Async::Ready(None));
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} else {
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self.state = InnerState::Headers;
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}
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}
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}
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}
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_ => (),
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}
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// read field headers for next field
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if self.state == InnerState::Headers {
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if let Async::Ready(headers) = InnerMultipart::read_headers(payload)?
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{
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self.state = InnerState::Boundary;
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headers
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} else {
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return Ok(Async::NotReady);
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}
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} else {
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unreachable!()
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}
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} else {
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debug!("NotReady: field is in flight");
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return Ok(Async::NotReady);
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};
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// content type
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let mut mt = mime::APPLICATION_OCTET_STREAM;
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if let Some(content_type) = headers.get(header::CONTENT_TYPE) {
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if let Ok(content_type) = content_type.to_str() {
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if let Ok(ct) = content_type.parse::<mime::Mime>() {
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mt = ct;
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}
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}
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}
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self.state = InnerState::Boundary;
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// nested multipart stream
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if mt.type_() == mime::MULTIPART {
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let inner = if let Some(boundary) = mt.get_param(mime::BOUNDARY) {
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Rc::new(RefCell::new(InnerMultipart {
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payload: self.payload.clone(),
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boundary: boundary.as_str().to_owned(),
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state: InnerState::FirstBoundary,
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item: InnerMultipartItem::None,
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}))
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} else {
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return Err(MultipartError::Boundary);
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};
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self.item = InnerMultipartItem::Multipart(Rc::clone(&inner));
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Ok(Async::Ready(Some(MultipartItem::Nested(Multipart {
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safety: safety.clone(),
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error: None,
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inner: Some(inner),
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}))))
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} else {
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let field = Rc::new(RefCell::new(InnerField::new(
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self.payload.clone(),
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self.boundary.clone(),
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&headers,
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)?));
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self.item = InnerMultipartItem::Field(Rc::clone(&field));
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Ok(Async::Ready(Some(MultipartItem::Field(Field::new(
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safety.clone(),
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headers,
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mt,
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field,
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)))))
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}
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}
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}
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}
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impl<S> Drop for InnerMultipart<S> {
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fn drop(&mut self) {
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// InnerMultipartItem::Field has to be dropped first because of Safety.
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self.item = InnerMultipartItem::None;
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}
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}
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/// A single field in a multipart stream
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pub struct Field<S> {
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ct: mime::Mime,
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headers: HeaderMap,
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inner: Rc<RefCell<InnerField<S>>>,
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safety: Safety,
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}
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impl<S> Field<S>
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where
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S: Stream<Item = Bytes, Error = PayloadError>,
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{
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fn new(
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safety: Safety, headers: HeaderMap, ct: mime::Mime,
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inner: Rc<RefCell<InnerField<S>>>,
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) -> Self {
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Field {
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ct,
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headers,
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inner,
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safety,
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}
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}
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pub fn headers(&self) -> &HeaderMap {
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&self.headers
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}
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pub fn content_type(&self) -> &mime::Mime {
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&self.ct
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}
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}
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impl<S> Stream for Field<S>
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where
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S: Stream<Item = Bytes, Error = PayloadError>,
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{
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type Item = Bytes;
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type Error = MultipartError;
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fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
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if self.safety.current() {
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self.inner.borrow_mut().poll(&self.safety)
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} else {
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Ok(Async::NotReady)
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}
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}
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}
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impl<S> fmt::Debug for Field<S> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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let res = writeln!(f, "\nMultipartField: {}", self.ct);
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let _ = writeln!(f, " boundary: {}", self.inner.borrow().boundary);
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let _ = writeln!(f, " headers:");
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for (key, val) in self.headers.iter() {
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let _ = writeln!(f, " {:?}: {:?}", key, val);
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}
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res
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}
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}
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struct InnerField<S> {
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payload: Option<PayloadRef<S>>,
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boundary: String,
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eof: bool,
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length: Option<u64>,
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}
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|
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impl<S> InnerField<S>
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where
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S: Stream<Item = Bytes, Error = PayloadError>,
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{
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fn new(
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payload: PayloadRef<S>, boundary: String, headers: &HeaderMap
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) -> Result<InnerField<S>, PayloadError> {
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let len = if let Some(len) = headers.get(header::CONTENT_LENGTH) {
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if let Ok(s) = len.to_str() {
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if let Ok(len) = s.parse::<u64>() {
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Some(len)
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} else {
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return Err(PayloadError::Incomplete);
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}
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} else {
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return Err(PayloadError::Incomplete);
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}
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} else {
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None
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};
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Ok(InnerField {
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boundary,
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payload: Some(payload),
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eof: false,
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length: len,
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})
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}
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|
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/// Reads body part content chunk of the specified size.
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/// The body part must has `Content-Length` header with proper value.
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fn read_len(
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payload: &mut PayloadHelper<S>, size: &mut u64
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) -> Poll<Option<Bytes>, MultipartError> {
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if *size == 0 {
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Ok(Async::Ready(None))
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} else {
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match payload.readany() {
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Ok(Async::NotReady) => Ok(Async::NotReady),
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Ok(Async::Ready(None)) => Err(MultipartError::Incomplete),
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Ok(Async::Ready(Some(mut chunk))) => {
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let len = cmp::min(chunk.len() as u64, *size);
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*size -= len;
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let ch = chunk.split_to(len as usize);
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if !chunk.is_empty() {
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payload.unread_data(chunk);
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}
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Ok(Async::Ready(Some(ch)))
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}
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Err(err) => Err(err.into()),
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}
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}
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}
|
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|
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/// Reads content chunk of body part with unknown length.
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/// The `Content-Length` header for body part is not necessary.
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fn read_stream(
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payload: &mut PayloadHelper<S>, boundary: &str
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) -> Poll<Option<Bytes>, MultipartError> {
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match payload.read_until(b"\r")? {
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Async::NotReady => Ok(Async::NotReady),
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|
Async::Ready(None) => Err(MultipartError::Incomplete),
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Async::Ready(Some(mut chunk)) => {
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if chunk.len() == 1 {
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payload.unread_data(chunk);
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match payload.read_exact(boundary.len() + 4)? {
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Async::NotReady => Ok(Async::NotReady),
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Async::Ready(None) => Err(MultipartError::Incomplete),
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Async::Ready(Some(chunk)) => {
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if &chunk[..2] == b"\r\n" && &chunk[2..4] == b"--"
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&& &chunk[4..] == boundary.as_bytes()
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{
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payload.unread_data(chunk);
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Ok(Async::Ready(None))
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} else {
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Ok(Async::Ready(Some(chunk)))
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}
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}
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}
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} else {
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let to = chunk.len() - 1;
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let ch = chunk.split_to(to);
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payload.unread_data(chunk);
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Ok(Async::Ready(Some(ch)))
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}
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}
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}
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}
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|
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fn poll(&mut self, s: &Safety) -> Poll<Option<Bytes>, MultipartError> {
|
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if self.payload.is_none() {
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return Ok(Async::Ready(None));
|
|
}
|
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|
|
let result = if let Some(payload) = self.payload.as_ref().unwrap().get_mut(s) {
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|
let res = if let Some(ref mut len) = self.length {
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InnerField::read_len(payload, len)?
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} else {
|
|
InnerField::read_stream(payload, &self.boundary)?
|
|
};
|
|
|
|
match res {
|
|
Async::NotReady => Async::NotReady,
|
|
Async::Ready(Some(bytes)) => Async::Ready(Some(bytes)),
|
|
Async::Ready(None) => {
|
|
self.eof = true;
|
|
match payload.readline()? {
|
|
Async::NotReady => Async::NotReady,
|
|
Async::Ready(None) => Async::Ready(None),
|
|
Async::Ready(Some(line)) => {
|
|
if line.as_ref() != b"\r\n" {
|
|
warn!("multipart field did not read all the data or it is malformed");
|
|
}
|
|
Async::Ready(None)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
Async::NotReady
|
|
};
|
|
|
|
if Async::Ready(None) == result {
|
|
self.payload.take();
|
|
}
|
|
Ok(result)
|
|
}
|
|
}
|
|
|
|
struct PayloadRef<S> {
|
|
payload: Rc<PayloadHelper<S>>,
|
|
}
|
|
|
|
impl<S> PayloadRef<S>
|
|
where
|
|
S: Stream<Item = Bytes, Error = PayloadError>,
|
|
{
|
|
fn new(payload: PayloadHelper<S>) -> PayloadRef<S> {
|
|
PayloadRef {
|
|
payload: Rc::new(payload),
|
|
}
|
|
}
|
|
|
|
fn get_mut<'a, 'b>(&'a self, s: &'b Safety) -> Option<&'a mut PayloadHelper<S>>
|
|
where
|
|
'a: 'b,
|
|
{
|
|
if s.current() {
|
|
let payload: &mut PayloadHelper<S> =
|
|
unsafe { &mut *(self.payload.as_ref() as *const _ as *mut _) };
|
|
Some(payload)
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<S> Clone for PayloadRef<S> {
|
|
fn clone(&self) -> PayloadRef<S> {
|
|
PayloadRef {
|
|
payload: Rc::clone(&self.payload),
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Counter. It tracks of number of clones of payloads and give access to
|
|
/// payload only to top most task panics if Safety get destroyed and it not top
|
|
/// most task.
|
|
#[derive(Debug)]
|
|
struct Safety {
|
|
task: Option<Task>,
|
|
level: usize,
|
|
payload: Rc<PhantomData<bool>>,
|
|
}
|
|
|
|
impl Safety {
|
|
fn new() -> Safety {
|
|
let payload = Rc::new(PhantomData);
|
|
Safety {
|
|
task: None,
|
|
level: Rc::strong_count(&payload),
|
|
payload,
|
|
}
|
|
}
|
|
|
|
fn current(&self) -> bool {
|
|
Rc::strong_count(&self.payload) == self.level
|
|
}
|
|
}
|
|
|
|
impl Clone for Safety {
|
|
fn clone(&self) -> Safety {
|
|
let payload = Rc::clone(&self.payload);
|
|
Safety {
|
|
task: Some(current_task()),
|
|
level: Rc::strong_count(&payload),
|
|
payload,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Drop for Safety {
|
|
fn drop(&mut self) {
|
|
// parent task is dead
|
|
if Rc::strong_count(&self.payload) != self.level {
|
|
panic!("Safety get dropped but it is not from top-most task");
|
|
}
|
|
if let Some(task) = self.task.take() {
|
|
task.notify()
|
|
}
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
use bytes::Bytes;
|
|
use futures::future::{lazy, result};
|
|
use payload::{Payload, PayloadWriter};
|
|
use tokio_core::reactor::Core;
|
|
|
|
#[test]
|
|
fn test_boundary() {
|
|
let headers = HeaderMap::new();
|
|
match Multipart::boundary(&headers) {
|
|
Err(MultipartError::NoContentType) => (),
|
|
_ => unreachable!("should not happen"),
|
|
}
|
|
|
|
let mut headers = HeaderMap::new();
|
|
headers.insert(
|
|
header::CONTENT_TYPE,
|
|
header::HeaderValue::from_static("test"),
|
|
);
|
|
|
|
match Multipart::boundary(&headers) {
|
|
Err(MultipartError::ParseContentType) => (),
|
|
_ => unreachable!("should not happen"),
|
|
}
|
|
|
|
let mut headers = HeaderMap::new();
|
|
headers.insert(
|
|
header::CONTENT_TYPE,
|
|
header::HeaderValue::from_static("multipart/mixed"),
|
|
);
|
|
match Multipart::boundary(&headers) {
|
|
Err(MultipartError::Boundary) => (),
|
|
_ => unreachable!("should not happen"),
|
|
}
|
|
|
|
let mut headers = HeaderMap::new();
|
|
headers.insert(
|
|
header::CONTENT_TYPE,
|
|
header::HeaderValue::from_static(
|
|
"multipart/mixed; boundary=\"5c02368e880e436dab70ed54e1c58209\"",
|
|
),
|
|
);
|
|
|
|
assert_eq!(
|
|
Multipart::boundary(&headers).unwrap(),
|
|
"5c02368e880e436dab70ed54e1c58209"
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_multipart() {
|
|
Core::new()
|
|
.unwrap()
|
|
.run(lazy(|| {
|
|
let (mut sender, payload) = Payload::new(false);
|
|
|
|
let bytes = Bytes::from(
|
|
"testasdadsad\r\n\
|
|
--abbc761f78ff4d7cb7573b5a23f96ef0\r\n\
|
|
Content-Type: text/plain; charset=utf-8\r\nContent-Length: 4\r\n\r\n\
|
|
test\r\n\
|
|
--abbc761f78ff4d7cb7573b5a23f96ef0\r\n\
|
|
Content-Type: text/plain; charset=utf-8\r\nContent-Length: 4\r\n\r\n\
|
|
data\r\n\
|
|
--abbc761f78ff4d7cb7573b5a23f96ef0--\r\n");
|
|
sender.feed_data(bytes);
|
|
|
|
let mut multipart = Multipart::new(
|
|
Ok("abbc761f78ff4d7cb7573b5a23f96ef0".to_owned()),
|
|
payload,
|
|
);
|
|
match multipart.poll() {
|
|
Ok(Async::Ready(Some(item))) => match item {
|
|
MultipartItem::Field(mut field) => {
|
|
assert_eq!(field.content_type().type_(), mime::TEXT);
|
|
assert_eq!(field.content_type().subtype(), mime::PLAIN);
|
|
|
|
match field.poll() {
|
|
Ok(Async::Ready(Some(chunk))) => {
|
|
assert_eq!(chunk, "test")
|
|
}
|
|
_ => unreachable!(),
|
|
}
|
|
match field.poll() {
|
|
Ok(Async::Ready(None)) => (),
|
|
_ => unreachable!(),
|
|
}
|
|
}
|
|
_ => unreachable!(),
|
|
},
|
|
_ => unreachable!(),
|
|
}
|
|
|
|
match multipart.poll() {
|
|
Ok(Async::Ready(Some(item))) => match item {
|
|
MultipartItem::Field(mut field) => {
|
|
assert_eq!(field.content_type().type_(), mime::TEXT);
|
|
assert_eq!(field.content_type().subtype(), mime::PLAIN);
|
|
|
|
match field.poll() {
|
|
Ok(Async::Ready(Some(chunk))) => {
|
|
assert_eq!(chunk, "data")
|
|
}
|
|
_ => unreachable!(),
|
|
}
|
|
match field.poll() {
|
|
Ok(Async::Ready(None)) => (),
|
|
_ => unreachable!(),
|
|
}
|
|
}
|
|
_ => unreachable!(),
|
|
},
|
|
_ => unreachable!(),
|
|
}
|
|
|
|
match multipart.poll() {
|
|
Ok(Async::Ready(None)) => (),
|
|
_ => unreachable!(),
|
|
}
|
|
|
|
let res: Result<(), ()> = Ok(());
|
|
result(res)
|
|
}))
|
|
.unwrap();
|
|
}
|
|
}
|