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extern crate actix_web;
extern crate bytes;
extern crate futures;
#[macro_use]
extern crate log;
extern crate tempfile;
#[macro_use]
extern crate failure;
extern crate mime;
use actix_web::dev::AsyncResult;
use actix_web::error::PayloadError;
use actix_web::http::header::ContentDisposition;
use actix_web::http::HeaderMap;
use actix_web::multipart::Multipart;
use actix_web::multipart::MultipartItem;
use actix_web::{FromRequest, HttpMessage, HttpRequest, HttpResponse, ResponseError};
use bytes::Bytes;
use futures::future::Either;
use futures::prelude::*;
use futures::stream;
use futures::Poll;
use mime::Mime;
use std::fs::File;
use std::io::Write;
use tempfile::tempfile;
#[derive(Debug)]
pub struct Field {
pub headers: HeaderMap,
pub content_type: Mime,
pub content_disposition: ContentDisposition,
pub form_data: FormData,
}
impl Field {
pub fn headers(&self) -> &HeaderMap {
&self.headers
}
pub fn content_type(&self) -> &Mime {
&self.content_type
}
pub fn content_disposition(&self) -> Option<ContentDisposition> {
Some(self.content_disposition.clone())
}
}
#[derive(Debug)]
pub enum FormData {
Data {
name: String,
value: Bytes,
},
File {
name: String,
filename: String,
file: File,
},
}
#[derive(Debug, Fail)]
pub enum Error {
#[fail(display = "Multipart error: {}", _0)]
Multipart(#[cause] ::actix_web::error::MultipartError),
#[fail(display = "Given data is not a form data")]
NotFormData,
#[fail(display = " File handling error: {}", _0)]
Io(#[cause] ::std::io::Error),
}
impl From<::actix_web::error::MultipartError> for Error {
fn from(e: ::actix_web::error::MultipartError) -> Self {
Error::Multipart(e)
}
}
impl From<::std::io::Error> for Error {
fn from(e: ::std::io::Error) -> Self {
Error::Io(e)
}
}
impl ResponseError for Error {
fn error_response(&self) -> HttpResponse {
match self {
Error::Multipart(_) => HttpResponse::BadRequest().body("multipart error"),
Error::NotFormData => HttpResponse::BadRequest().body("not a form data"),
Error::Io(_) => HttpResponse::InternalServerError().body("file error"),
}
}
}
pub type BoxStream<'a, T, E> = Box<Stream<Item = T, Error = E> + 'a>;
fn save_into_tempfile<S, I, E>(input: S) -> impl Future<Item = File, Error = Error>
where
S: Stream<Item = I, Error = E>,
I: AsRef<[u8]>,
Error: From<E>,
{
tempfile()
.into_future()
.from_err()
.and_then(|tempfile| {
let file = tempfile.try_clone()?;
Ok((tempfile, file))
}).and_then(|(mut tempfile, mut file)| {
input
.from_err()
.and_then(move |bytes| {
tempfile.write_all(bytes.as_ref()).map_err(|err| err.into())
}).collect()
.and_then(move |_| {
use std::io::{Seek, SeekFrom};
file.seek(SeekFrom::Start(0))?;
Ok(file)
})
})
}
pub fn save_files<S>(multipart: Multipart<S>) -> BoxStream<'static, Field, Error>
where
S: Stream<Item = Bytes, Error = PayloadError> + 'static,
{
let st = multipart
.map_err(Error::from)
.map(|item| -> BoxStream<Field, Error> {
match item {
MultipartItem::Nested(m) => save_files(m),
MultipartItem::Field(field) => {
debug!("multipart field: {:?}", field);
let content_disposition = match field.content_disposition() {
Some(d) => d,
None => return Box::new(stream::once(Err(Error::NotFormData))),
};
if !content_disposition.is_form_data() {
return Box::new(stream::once(Err(Error::NotFormData)));
}
let name = match content_disposition.get_name() {
Some(n) => n.to_string(),
None => return Box::new(stream::empty()),
};
let content_type = field.content_type().clone();
let headers = field.headers().clone();
let form_data = match content_disposition.get_filename() {
None => {
let fut = field
.from_err()
.concat2()
.map(|value| FormData::Data { name, value });
Either::A(fut)
}
Some(filename) => {
let filename = filename.to_string();
let fut = save_into_tempfile(field).map(move |file| FormData::File {
name,
filename,
file,
});
Either::B(fut)
}
};
let fut = form_data.map(move |form_data| Field {
content_type,
headers,
content_disposition,
form_data,
});
Box::new(fut.into_stream())
}
}
}).flatten();
Box::new(st)
}
pub struct Multiparts(BoxStream<'static, Field, Error>);
impl<S> FromRequest<S> for Multiparts {
type Config = ();
type Result = AsyncResult<Self>;
fn from_request(req: &HttpRequest<S>, _: &Self::Config) -> Self::Result {
AsyncResult::ok(Multiparts(save_files(req.multipart())))
}
}
impl Stream for Multiparts {
type Item = Field;
type Error = Error;
fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
self.0.poll()
}
}