1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136

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()) {
            // multipart
            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]))),
            },
        )
    })
}