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#![cfg_attr(feature = "docs", feature(external_doc))]
#![cfg_attr(feature = "docs", doc(include = "../README.md"))]
#![cfg_attr(feature = "docs", warn(missing_docs))]
use actix_http::error::PayloadError;
use actix_http::http::HeaderMap;
use actix_multipart::Field as ActixField;
use actix_multipart::Multipart as ActixMultipart;
use actix_multipart::MultipartError as ActixMultipartError;
use bytes::Bytes;
use futures::Stream;
use hyper::Body;
use roa_core::http::{header::CONTENT_TYPE, StatusCode};
use roa_core::{Context, Status};
use std::fmt::{self, Display, Formatter};
use std::io;
use std::ops::Deref;
use std::pin::Pin;
use std::task::{self, Poll};
pub trait MultipartForm {
fn form(&mut self) -> Multipart;
}
impl<S> MultipartForm for Context<S> {
fn form(&mut self) -> Multipart {
let mut map = HeaderMap::new();
if let Some(value) = self.req.headers.get(CONTENT_TYPE) {
map.insert(CONTENT_TYPE, value.clone())
}
Multipart(ActixMultipart::new(
&map,
WrapStream(Some(self.req.raw_body())),
))
}
}
pub struct Multipart(ActixMultipart);
pub struct Field(ActixField);
#[derive(Debug)]
pub struct MultipartError(ActixMultipartError);
struct WrapStream(Option<Body>);
impl Stream for WrapStream {
type Item = Result<Bytes, PayloadError>;
fn poll_next(
mut self: Pin<&mut Self>,
cx: &mut task::Context<'_>,
) -> Poll<Option<Self::Item>> {
match &mut self.0 {
None => Poll::Ready(None),
Some(body) => match futures::ready!(Pin::new(body).poll_next(cx)) {
None => {
self.0 = None;
self.poll_next(cx)
}
Some(item) => Poll::Ready(Some(match item {
Ok(data) => Ok(data),
Err(err) => Err(if err.is_incomplete_message() {
PayloadError::Incomplete(Some(io::Error::new(
io::ErrorKind::UnexpectedEof,
err,
)))
} else {
PayloadError::Io(io::Error::new(io::ErrorKind::Other, err))
}),
})),
},
}
}
}
impl Stream for Multipart {
type Item = Result<Field, MultipartError>;
#[inline]
fn poll_next(
mut self: Pin<&mut Self>,
cx: &mut task::Context<'_>,
) -> Poll<Option<Self::Item>> {
match futures::ready!(Pin::new(&mut self.0).poll_next(cx)) {
None => Poll::Ready(None),
Some(item) => Poll::Ready(Some(match item {
Ok(field) => Ok(Field(field)),
Err(err) => Err(MultipartError(err)),
})),
}
}
}
impl Stream for Field {
type Item = Result<Bytes, io::Error>;
#[inline]
fn poll_next(
mut self: Pin<&mut Self>,
cx: &mut task::Context<'_>,
) -> Poll<Option<Self::Item>> {
match futures::ready!(Pin::new(&mut self.0).poll_next(cx)) {
None => Poll::Ready(None),
Some(item) => Poll::Ready(Some(match item {
Ok(bytes) => Ok(bytes),
Err(err) => Err(match err {
ActixMultipartError::Payload(PayloadError::Io(err)) => err,
err => io::Error::new(
io::ErrorKind::Other,
Status::new(
StatusCode::INTERNAL_SERVER_ERROR,
format!("{}\nread multipart field error.", err),
false,
)
.to_string(),
),
}),
})),
}
}
}
impl Deref for Field {
type Target = ActixField;
#[inline]
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl From<MultipartError> for Status {
#[inline]
fn from(err: MultipartError) -> Self {
Status::new(StatusCode::BAD_REQUEST, err, true)
}
}
impl Display for MultipartError {
#[inline]
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
f.write_fmt(format_args!("{}\nmultipart form read error.", self.0))
}
}
#[cfg(test)]
mod tests {
use super::MultipartForm;
use async_std::fs::{read, read_to_string};
use futures::stream::TryStreamExt;
use futures::{AsyncReadExt, StreamExt};
use reqwest::{
multipart::{Form, Part},
Client,
};
use roa::http::{header::CONTENT_TYPE, StatusCode};
use roa::router::{post, Router};
use roa::tcp::Listener;
use roa::{throw, App, Context};
use std::error::Error as StdError;
const FILE_PATH: &str = "../assets/author.txt";
const FILE_NAME: &str = "author.txt";
const FIELD_NAME: &str = "file";
async fn post_file(ctx: &mut Context) -> roa::Result {
let mut form = ctx.form();
while let Some(item) = form.next().await {
let field = item?;
match field.content_disposition() {
None => throw!(StatusCode::BAD_REQUEST, "content disposition not set"),
Some(disposition) => {
match (disposition.get_filename(), disposition.get_name()) {
(Some(filename), Some(name)) => {
assert_eq!(FIELD_NAME, name);
assert_eq!(FILE_NAME, filename);
let mut content = String::new();
field.into_async_read().read_to_string(&mut content).await?;
let expected_content = read_to_string(FILE_PATH).await?;
assert_eq!(&expected_content, &content);
}
_ => throw!(StatusCode::BAD_REQUEST, "invalid field"),
}
}
}
}
Ok(())
}
#[tokio::test]
async fn upload() -> Result<(), Box<dyn StdError>> {
let router = Router::new().on("/file", post(post_file));
let app = App::new().end(router.routes("/")?);
let (addr, server) = app.run()?;
async_std::task::spawn(server);
let url = format!("http://{}/file", addr);
let client = Client::new();
let form = Form::new().part(
FIELD_NAME,
Part::bytes(read(FILE_PATH).await?).file_name(FILE_NAME),
);
let boundary = form.boundary().to_string();
let resp = client
.post(&url)
.body(form.stream())
.header(
CONTENT_TYPE,
format!(r#"multipart/form-data; boundary="{}""#, boundary),
)
.send()
.await?;
assert_eq!(StatusCode::OK, resp.status());
Ok(())
}
}