use crate::http::GQLRequest;
use crate::query::{IntoQueryBuilder, IntoQueryBuilderOpts};
use crate::{ParseRequestError, QueryBuilder};
use bytes::Bytes;
use futures::{stream, AsyncRead, AsyncReadExt, Stream};
use multer::{Constraints, Multipart, SizeLimit};
use std::collections::HashMap;
use std::io::{self, Seek, SeekFrom, Write};
use std::pin::Pin;
use std::task::Poll;
impl From<multer::Error> for ParseRequestError {
fn from(err: multer::Error) -> Self {
match err {
multer::Error::FieldSizeExceeded { .. } | multer::Error::StreamSizeExceeded { .. } => {
ParseRequestError::PayloadTooLarge
}
_ => ParseRequestError::InvalidMultipart(err),
}
}
}
#[async_trait::async_trait]
impl<CT, Body> IntoQueryBuilder for (Option<CT>, Body)
where
CT: AsRef<str> + Send,
Body: AsyncRead + Send + Unpin + 'static,
{
async fn into_query_builder_opts(
mut self,
opts: &IntoQueryBuilderOpts,
) -> std::result::Result<QueryBuilder, ParseRequestError> {
if let Some(boundary) = self.0.and_then(|ct| multer::parse_boundary(ct).ok()) {
let mut multipart = Multipart::new_with_constraints(
reader_stream(self.1),
boundary,
Constraints::new().size_limit({
let mut limit = SizeLimit::new();
if let (Some(max_file_size), Some(max_num_files)) =
(opts.max_file_size, opts.max_file_size)
{
limit = limit.whole_stream((max_file_size * max_num_files) as u64);
}
if let Some(max_file_size) = opts.max_file_size {
limit = limit.per_field(max_file_size as u64);
}
limit
}),
);
let mut builder = None;
let mut map = None;
let mut files = Vec::new();
while let Some(mut field) = multipart.next_field().await? {
match field.name() {
Some("operations") => {
let request_str = field.text().await?;
let request: GQLRequest = serde_json::from_str(&request_str)
.map_err(ParseRequestError::InvalidRequest)?;
builder = Some(request.into_query_builder().await?);
}
Some("map") => {
let map_str = field.text().await?;
map = Some(
serde_json::from_str::<HashMap<String, Vec<String>>>(&map_str)
.map_err(ParseRequestError::InvalidFilesMap)?,
);
}
_ => {
if let Some(name) = field.name().map(ToString::to_string) {
if let Some(filename) = field.file_name().map(ToString::to_string) {
let content_type =
field.content_type().map(|mime| mime.to_string());
let mut file =
tempfile::tempfile().map_err(ParseRequestError::Io)?;
while let Some(chunk) = field.chunk().await.unwrap() {
file.write(&chunk).map_err(ParseRequestError::Io)?;
}
file.seek(SeekFrom::Start(0))?;
files.push((name, filename, content_type, file));
}
}
}
}
}
let mut builder = builder.ok_or(ParseRequestError::MissingOperatorsPart)?;
let map = map.as_mut().ok_or(ParseRequestError::MissingMapPart)?;
for (name, filename, content_type, file) in files {
if let Some(var_paths) = map.remove(&name) {
for var_path in var_paths {
builder.set_upload(
&var_path,
filename.clone(),
content_type.clone(),
file.try_clone().unwrap(),
);
}
}
}
if !map.is_empty() {
return Err(ParseRequestError::MissingFiles);
}
Ok(builder)
} else {
let mut data = Vec::new();
self.1
.read_to_end(&mut data)
.await
.map_err(ParseRequestError::Io)?;
let gql_request: GQLRequest =
serde_json::from_slice(&data).map_err(ParseRequestError::InvalidRequest)?;
gql_request.into_query_builder().await
}
}
}
fn reader_stream(
mut reader: impl AsyncRead + Unpin + Send + 'static,
) -> impl Stream<Item = io::Result<Bytes>> + Unpin + Send + 'static {
let mut buf = [0u8; 2048];
stream::poll_fn(move |cx| {
Poll::Ready(
match futures::ready!(Pin::new(&mut reader).poll_read(cx, &mut buf)?) {
0 => None,
size => Some(Ok(Bytes::copy_from_slice(&buf[..size]))),
},
)
})
}