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
use super::{rejection::*, FromRequest, RequestParts};
use async_trait::async_trait;
use axum_core::response::IntoResponse;
use std::ops::Deref;
#[derive(Debug, Clone)]
pub struct ContentLengthLimit<T, const N: u64>(pub T);
#[async_trait]
impl<T, B, const N: u64> FromRequest<B> for ContentLengthLimit<T, N>
where
T: FromRequest<B>,
T::Rejection: IntoResponse,
B: Send,
{
type Rejection = ContentLengthLimitRejection<T::Rejection>;
async fn from_request(req: &mut RequestParts<B>) -> Result<Self, Self::Rejection> {
let content_length = req.headers().get(http::header::CONTENT_LENGTH);
let content_length =
content_length.and_then(|value| value.to_str().ok()?.parse::<u64>().ok());
if let Some(length) = content_length {
if length > N {
return Err(ContentLengthLimitRejection::PayloadTooLarge(
PayloadTooLarge,
));
}
} else {
return Err(ContentLengthLimitRejection::LengthRequired(LengthRequired));
};
let value = T::from_request(req)
.await
.map_err(ContentLengthLimitRejection::Inner)?;
Ok(Self(value))
}
}
impl<T, const N: u64> Deref for ContentLengthLimit<T, N> {
type Target = T;
fn deref(&self) -> &Self::Target {
&self.0
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::{body::Bytes, routing::post, test_helpers::*, Router};
use http::StatusCode;
use serde::Deserialize;
#[tokio::test]
async fn body_with_length_limit() {
use std::iter::repeat;
#[derive(Debug, Deserialize)]
#[allow(dead_code)]
struct Input {
foo: String,
}
const LIMIT: u64 = 8;
let app = Router::new().route(
"/",
post(|_body: ContentLengthLimit<Bytes, LIMIT>| async {}),
);
let client = TestClient::new(app);
let res = client
.post("/")
.body(repeat(0_u8).take((LIMIT - 1) as usize).collect::<Vec<_>>())
.send()
.await;
assert_eq!(res.status(), StatusCode::OK);
let res = client
.post("/")
.body(repeat(0_u8).take(LIMIT as usize).collect::<Vec<_>>())
.send()
.await;
assert_eq!(res.status(), StatusCode::OK);
let res = client
.post("/")
.body(repeat(0_u8).take((LIMIT + 1) as usize).collect::<Vec<_>>())
.send()
.await;
assert_eq!(res.status(), StatusCode::PAYLOAD_TOO_LARGE);
let res = client
.post("/")
.body(reqwest::Body::wrap_stream(futures_util::stream::iter(
vec![Ok::<_, std::io::Error>(Bytes::new())],
)))
.send()
.await;
assert_eq!(res.status(), StatusCode::LENGTH_REQUIRED);
}
}