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|
use axum::{
extract::FromRequestParts,
http::{request::Parts, HeaderName, HeaderValue},
};
use axum_extra::typed_header::TypedHeader;
/// A typed header. When used as a bare extractor, reads from the
/// `Last-Event-Id` HTTP header.
pub struct LastEventId(pub String);
static LAST_EVENT_ID: HeaderName = HeaderName::from_static("last-event-id");
impl headers::Header for LastEventId {
fn name() -> &'static HeaderName {
&LAST_EVENT_ID
}
fn decode<'i, I>(values: &mut I) -> Result<Self, headers::Error>
where
I: Iterator<Item = &'i HeaderValue>,
{
let value = values.next().ok_or_else(headers::Error::invalid)?;
if let Ok(value) = value.to_str() {
Ok(Self(value.into()))
} else {
Err(headers::Error::invalid())
}
}
fn encode<E>(&self, values: &mut E)
where
E: Extend<HeaderValue>,
{
let Self(value) = self;
// Must panic or suppress; the trait provides no other options.
let value = HeaderValue::from_str(value).expect("LastEventId is a valid header value");
values.extend(std::iter::once(value));
}
}
#[async_trait::async_trait]
impl<S> FromRequestParts<S> for LastEventId
where
S: Send + Sync,
{
type Rejection = <TypedHeader<Self> as FromRequestParts<S>>::Rejection;
async fn from_request_parts(parts: &mut Parts, state: &S) -> Result<Self, Self::Rejection> {
// This is purely for ergonomics: it allows `RequestedAt` to be extracted
// without having to wrap it in `Extension<>`. Callers _can_ still do that,
// but they aren't forced to.
let TypedHeader(requested_at) =
TypedHeader::<Self>::from_request_parts(parts, state).await?;
Ok(requested_at)
}
}
impl From<String> for LastEventId {
fn from(header: String) -> Self {
Self(header)
}
}
impl std::ops::Deref for LastEventId {
type Target = str;
fn deref(&self) -> &Self::Target {
let Self(header) = self;
header
}
}
|
