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
use std::collections::HashSet;
use http::{header::HeaderName, HeaderMap};
use crate::{Endpoint, IntoResponse, Middleware, Request, Response, Result};
#[derive(Default)]
pub struct PropagateHeader {
headers: HashSet<HeaderName>,
}
impl PropagateHeader {
#[must_use]
pub fn new() -> Self {
Default::default()
}
#[must_use]
pub fn header<K>(mut self, key: K) -> Self
where
K: TryInto<HeaderName>,
{
if let Ok(key) = key.try_into() {
self.headers.insert(key);
}
self
}
}
impl<E: Endpoint> Middleware<E> for PropagateHeader {
type Output = PropagateHeaderEndpoint<E>;
fn transform(&self, ep: E) -> Self::Output {
PropagateHeaderEndpoint {
inner: ep,
headers: self.headers.clone(),
}
}
}
pub struct PropagateHeaderEndpoint<E> {
inner: E,
headers: HashSet<HeaderName>,
}
#[async_trait::async_trait]
impl<E: Endpoint> Endpoint for PropagateHeaderEndpoint<E> {
type Output = Response;
async fn call(&self, req: Request) -> Result<Self::Output> {
let mut headers = HeaderMap::new();
for header in &self.headers {
for value in req.headers().get_all(header) {
headers.append(header.clone(), value.clone());
}
}
let mut resp = self.inner.call(req).await?.into_response();
resp.headers_mut().extend(headers);
Ok(resp)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::{handler, EndpointExt};
#[tokio::test]
async fn test_propagate_header() {
#[handler(internal)]
fn index() {}
let resp = index
.with(PropagateHeader::new().header("x-request-id"))
.call(Request::builder().header("x-request-id", "100").finish())
.await
.unwrap();
assert_eq!(
resp.headers()
.get("x-request-id")
.and_then(|value| value.to_str().ok()),
Some("100")
);
}
}