153 lines
4.6 KiB
Rust
153 lines
4.6 KiB
Rust
use crate::{ParseRequestError, Request};
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use bytes::Bytes;
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use futures::io::AsyncRead;
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use futures::stream::Stream;
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use multer::{Constraints, Multipart, SizeLimit};
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use pin_project_lite::pin_project;
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use std::collections::HashMap;
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use std::io::{self, Seek, SeekFrom, Write};
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use std::pin::Pin;
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use std::task::{Context, Poll};
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/// Options for `receive_multipart`.
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#[derive(Default, Clone)]
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#[non_exhaustive]
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pub struct MultipartOptions {
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/// The maximum file size.
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pub max_file_size: Option<usize>,
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/// The maximum number of files.
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pub max_num_files: Option<usize>,
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}
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impl MultipartOptions {
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/// Set maximum file size.
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pub fn max_file_size(self, size: usize) -> Self {
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MultipartOptions {
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max_file_size: Some(size),
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..self
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}
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}
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/// Set maximum number of files.
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pub fn max_num_files(self, n: usize) -> Self {
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MultipartOptions {
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max_num_files: Some(n),
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..self
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}
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}
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}
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/// Receive a multipart request.
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pub async fn receive_multipart(
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body: impl AsyncRead + Send + 'static,
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boundary: impl Into<String>,
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opts: MultipartOptions,
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) -> Result<Request, ParseRequestError> {
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let mut multipart = Multipart::new_with_constraints(
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ReaderStream::new(body),
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boundary,
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Constraints::new().size_limit({
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let mut limit = SizeLimit::new();
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if let (Some(max_file_size), Some(max_num_files)) =
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(opts.max_file_size, opts.max_file_size)
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{
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limit = limit.whole_stream((max_file_size * max_num_files) as u64);
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}
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if let Some(max_file_size) = opts.max_file_size {
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limit = limit.per_field(max_file_size as u64);
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}
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limit
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}),
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);
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let mut request = None;
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let mut map = None;
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let mut files = Vec::new();
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while let Some(mut field) = multipart.next_field().await? {
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match field.name() {
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Some("operations") => {
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let request_str = field.text().await?;
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request = Some(
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serde_json::from_str::<Request>(&request_str)
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.map_err(ParseRequestError::InvalidRequest)?,
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);
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}
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Some("map") => {
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let map_str = field.text().await?;
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map = Some(
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serde_json::from_str::<HashMap<String, Vec<String>>>(&map_str)
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.map_err(ParseRequestError::InvalidFilesMap)?,
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);
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}
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_ => {
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if let Some(name) = field.name().map(ToString::to_string) {
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if let Some(filename) = field.file_name().map(ToString::to_string) {
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let content_type = field.content_type().map(|mime| mime.to_string());
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let mut file = tempfile::tempfile().map_err(ParseRequestError::Io)?;
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while let Some(chunk) = field.chunk().await.unwrap() {
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file.write(&chunk).map_err(ParseRequestError::Io)?;
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}
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file.seek(SeekFrom::Start(0))?;
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files.push((name, filename, content_type, file));
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}
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}
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}
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}
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}
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let mut request: Request = request.ok_or(ParseRequestError::MissingOperatorsPart)?;
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let map = map.as_mut().ok_or(ParseRequestError::MissingMapPart)?;
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for (name, filename, content_type, file) in files {
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if let Some(var_paths) = map.remove(&name) {
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for var_path in var_paths {
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request.set_upload(
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&var_path,
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filename.clone(),
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content_type.clone(),
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file.try_clone().unwrap(),
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);
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}
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}
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}
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if !map.is_empty() {
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return Err(ParseRequestError::MissingFiles);
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}
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Ok(request)
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}
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pin_project! {
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struct ReaderStream<T> {
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buf: [u8; 2048],
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#[pin]
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reader: T,
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}
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}
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impl<T> ReaderStream<T> {
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fn new(reader: T) -> Self {
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Self {
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buf: [0; 2048],
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reader,
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}
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}
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}
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impl<T: AsyncRead> Stream for ReaderStream<T> {
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type Item = io::Result<Bytes>;
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fn poll_next(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
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let this = self.project();
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Poll::Ready(
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match futures::ready!(this.reader.poll_read(cx, this.buf)?) {
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0 => None,
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size => Some(Ok(Bytes::copy_from_slice(&this.buf[..size]))),
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},
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)
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}
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}
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