137 lines
5.3 KiB
Rust
137 lines
5.3 KiB
Rust
use crate::http::GQLRequest;
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use crate::query::{IntoQueryBuilder, IntoQueryBuilderOpts};
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use crate::{ParseRequestError, QueryBuilder};
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use bytes::Bytes;
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use futures::{stream, AsyncRead, AsyncReadExt, Stream};
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use multer::{Constraints, Multipart, SizeLimit};
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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::Poll;
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impl From<multer::Error> for ParseRequestError {
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fn from(err: multer::Error) -> Self {
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match err {
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multer::Error::FieldSizeExceeded { .. } | multer::Error::StreamSizeExceeded { .. } => {
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ParseRequestError::PayloadTooLarge
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}
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_ => ParseRequestError::InvalidMultipart(err),
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}
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}
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}
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#[async_trait::async_trait]
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impl<CT, Body> IntoQueryBuilder for (Option<CT>, Body)
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where
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CT: AsRef<str> + Send,
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Body: AsyncRead + Send + Unpin + 'static,
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{
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async fn into_query_builder_opts(
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mut self,
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opts: &IntoQueryBuilderOpts,
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) -> std::result::Result<QueryBuilder, ParseRequestError> {
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if let Some(boundary) = self.0.and_then(|ct| multer::parse_boundary(ct).ok()) {
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// multipart
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let mut multipart = Multipart::new_with_constraints(
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reader_stream(self.1),
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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 builder = 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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let request: GQLRequest = serde_json::from_str(&request_str)
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.map_err(ParseRequestError::InvalidRequest)?;
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builder = Some(request.into_query_builder().await?);
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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 =
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field.content_type().map(|mime| mime.to_string());
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let mut file =
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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 builder = builder.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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builder.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(builder)
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} else {
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let mut data = Vec::new();
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self.1
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.read_to_end(&mut data)
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.await
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.map_err(ParseRequestError::Io)?;
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let gql_request: GQLRequest =
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serde_json::from_slice(&data).map_err(ParseRequestError::InvalidRequest)?;
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gql_request.into_query_builder().await
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}
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}
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}
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fn reader_stream(
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mut reader: impl AsyncRead + Unpin + Send + 'static,
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) -> impl Stream<Item = io::Result<Bytes>> + Unpin + Send + 'static {
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let mut buf = [0u8; 2048];
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stream::poll_fn(move |cx| {
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Poll::Ready(
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match futures::ready!(Pin::new(&mut reader).poll_read(cx, &mut buf)?) {
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0 => None,
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size => Some(Ok(Bytes::copy_from_slice(&buf[..size]))),
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},
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)
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})
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}
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