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use axum::{
extract::FromRequestParts,
http::request::Parts,
response::{IntoResponseParts, ResponseParts},
};
use axum_extra::extract::cookie::{Cookie, CookieJar};
// The usage pattern here - receive the extractor as an argument, return it in
// the response - is heavily modelled after CookieJar's own intended usage.
pub struct IdentityToken {
cookies: CookieJar,
}
impl IdentityToken {
/// Get the identity secret sent in the request, if any. If the identity
/// was not sent, or if it has previously been [clear]ed, then this will
/// return [None]. If the identity has previously been [set], then this
/// will return that secret, regardless of what the request originally
/// included.
pub fn secret(&self) -> Option<&str> {
self.cookies.get(IDENTITY_COOKIE).map(Cookie::value)
}
/// Positively set the identity secret, and ensure that it will be sent
/// back to the client when this extractor is included in a response.
pub fn set(self, secret: &str) -> Self {
let identity_cookie = Cookie::build((IDENTITY_COOKIE, String::from(secret)))
.http_only(true)
.permanent()
.build();
Self {
cookies: self.cookies.add(identity_cookie),
}
}
/// Remove the identity secret and ensure that it will be cleared when this
/// extractor is included in a response.
pub fn clear(self) -> Self {
Self {
cookies: self.cookies.remove(IDENTITY_COOKIE),
}
}
}
const IDENTITY_COOKIE: &str = "identity";
#[async_trait::async_trait]
impl<S> FromRequestParts<S> for IdentityToken
where
S: Send + Sync,
{
type Rejection = <CookieJar as FromRequestParts<S>>::Rejection;
async fn from_request_parts(parts: &mut Parts, state: &S) -> Result<Self, Self::Rejection> {
let cookies = CookieJar::from_request_parts(parts, state).await?;
Ok(Self { cookies })
}
}
impl IntoResponseParts for IdentityToken {
type Error = <CookieJar as IntoResponseParts>::Error;
fn into_response_parts(self, res: ResponseParts) -> Result<ResponseParts, Self::Error> {
let Self { cookies } = self;
cookies.into_response_parts(res)
}
}
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