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use super::{
rejection::{FailedToResolveHost, HostRejection},
FromRequest, RequestParts,
};
use async_trait::async_trait;
const X_FORWARDED_HOST_HEADER_KEY: &str = "X-Forwarded-Host";
#[derive(Debug, Clone)]
pub struct Host(pub String);
#[async_trait]
impl<B> FromRequest<B> for Host
where
B: Send,
{
type Rejection = HostRejection;
async fn from_request(req: &mut RequestParts<B>) -> Result<Self, Self::Rejection> {
if let Some(host) = req
.headers()
.get(X_FORWARDED_HOST_HEADER_KEY)
.and_then(|host| host.to_str().ok())
{
return Ok(Host(host.to_owned()));
}
if let Some(host) = req
.headers()
.get(http::header::HOST)
.and_then(|host| host.to_str().ok())
{
return Ok(Host(host.to_owned()));
}
if let Some(host) = req.uri().host() {
return Ok(Host(host.to_owned()));
}
Err(HostRejection::FailedToResolveHost(FailedToResolveHost))
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::{routing::get, test_helpers::TestClient, Router};
fn test_client() -> TestClient {
async fn host_as_body(Host(host): Host) -> String {
host
}
TestClient::new(Router::new().route("/", get(host_as_body)))
}
#[tokio::test]
async fn host_header() {
let original_host = "some-domain:123";
let host = test_client()
.get("/")
.header(http::header::HOST, original_host)
.send()
.await
.text()
.await;
assert_eq!(host, original_host);
}
#[tokio::test]
async fn x_forwarded_host_header() {
let original_host = "some-domain:456";
let host = test_client()
.get("/")
.header(X_FORWARDED_HOST_HEADER_KEY, original_host)
.send()
.await
.text()
.await;
assert_eq!(host, original_host);
}
#[tokio::test]
async fn x_forwarded_host_precedence_over_host_header() {
let x_forwarded_host_header = "some-domain:456";
let host_header = "some-domain:123";
let host = test_client()
.get("/")
.header(X_FORWARDED_HOST_HEADER_KEY, x_forwarded_host_header)
.header(http::header::HOST, host_header)
.send()
.await
.text()
.await;
assert_eq!(host, x_forwarded_host_header);
}
#[tokio::test]
async fn uri_host() {
let host = test_client().get("/").send().await.text().await;
assert!(host.contains("127.0.0.1"));
}
}