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
use crate::digest::ContentDigest;
use mime::Mime;
use serde::{de::Error as _, Deserialize, Deserializer, Serialize, Serializer};
#[cfg(feature = "axum")]
use axum::{
extract::rejection::{TypedHeaderRejection, TypedHeaderRejectionReason},
extract::{FromRequest, RequestParts, TypedHeader},
headers::{ContentLength, ContentType},
response::{IntoResponseParts, Response, ResponseParts},
};
#[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
pub struct Meta {
#[serde(rename = "digest")]
pub hash: ContentDigest<Box<[u8]>>,
#[serde(rename = "length")]
pub size: u64,
#[serde(deserialize_with = "deserialize")]
#[serde(serialize_with = "serialize")]
#[serde(rename = "type")]
pub mime: Mime,
}
fn deserialize<'de, D: Deserializer<'de>>(deserializer: D) -> Result<Mime, D::Error> {
String::deserialize(deserializer)?
.parse()
.map_err(|_| D::Error::custom("invalid mime type"))
}
fn serialize<S: Serializer>(mime: &Mime, serializer: S) -> Result<S::Ok, S::Error> {
mime.to_string().serialize(serializer)
}
#[cfg(feature = "axum")]
#[axum::async_trait]
impl<B: Send> FromRequest<B> for Meta {
type Rejection = TypedHeaderRejection;
async fn from_request(req: &mut RequestParts<B>) -> Result<Self, Self::Rejection> {
let hash = match req.extract().await {
Ok(TypedHeader(hash)) => hash,
Err(e) if matches!(e.reason(), TypedHeaderRejectionReason::Missing) => {
Default::default()
}
Err(e) => return Err(e),
};
let size = req.extract::<TypedHeader<ContentLength>>().await?.0 .0;
let mime = req.extract::<TypedHeader<ContentType>>().await?.0.into();
Ok(Meta { hash, size, mime })
}
}
#[cfg(feature = "axum")]
impl IntoResponseParts for Meta {
type Error = Response;
fn into_response_parts(self, res: ResponseParts) -> Result<ResponseParts, Self::Error> {
let hash = TypedHeader(self.hash);
let size = TypedHeader(ContentLength(self.size));
let mime = TypedHeader(ContentType::from(self.mime));
(hash, size, mime).into_response_parts(res)
}
}
#[cfg(test)]
mod tests {
use super::*;
use serde_json::json;
#[test]
fn serialization() {
let meta = Meta {
hash: "sha-384=:mqVuAfXRKap7bdgcCY5uykM6+R9GqQ8K/uxy9rx7HNQlGYl1kPzQho1wx4JwY8w=:"
.parse()
.unwrap(),
size: 42,
mime: "text/plain".parse().unwrap(),
};
let json = json!({
"digest": {"sha-384": "mqVuAfXRKap7bdgcCY5uykM6+R9GqQ8K/uxy9rx7HNQlGYl1kPzQho1wx4JwY8w="},
"length": 42,
"type": "text/plain",
});
assert_eq!(serde_json::to_string(&meta).unwrap(), json.to_string());
}
}
