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service.rs
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service.rs
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use std::{
sync::Arc,
task::{Context, Poll},
};
use axum::{body::Body, response::IntoResponse};
use futures::future::BoxFuture;
use http::Request;
use serde::de::DeserializeOwned;
use crate::{
error::AuthError, extract, layer::KeycloakAuthLayer, role::Role, KeycloakAuthStatus,
PassthroughMode,
};
#[derive(Clone)]
pub struct KeycloakAuthService<S, R, Extra>
where
R: Role,
Extra: DeserializeOwned + Clone,
{
inner: S,
layer: KeycloakAuthLayer<R, Extra>,
}
impl<S, R, Extra> KeycloakAuthService<S, R, Extra>
where
R: Role,
Extra: DeserializeOwned + Clone,
{
pub fn new(inner: S, layer: &KeycloakAuthLayer<R, Extra>) -> Self {
Self {
inner,
layer: layer.clone(),
}
}
}
impl<S, R, Extra> tower::Service<http::Request<axum::body::Body>>
for KeycloakAuthService<S, R, Extra>
where
S: tower::Service<Request<Body>, Response = axum::response::Response> + Clone + Send + 'static,
S::Future: Send + 'static,
R: Role + 'static,
Extra: DeserializeOwned + Clone + Sync + Send + 'static,
{
type Response = S::Response;
type Error = S::Error;
type Future = BoxFuture<'static, Result<Self::Response, Self::Error>>;
fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
// Once ready, we shall always be ready, independent of future discovery requests,
// satisfying a `poll_ready` requirement!
let is_ready = self.layer.instance.discovery.version() > 0;
if is_ready {
tracing::debug!("Ready to process requests.");
} else {
tracing::debug!("Not ready to process requests. Waiting for initial discovery...");
// We have to assume that the discovery action was initialized.
// Our waker handling in would otherwise be wrong!
assert!(self.layer.instance.discovery.is_pending());
let instance = self.layer.instance.clone();
let waker = cx.waker().clone();
tokio::spawn(async move {
instance.discovery.notified().await;
waker.wake();
});
}
match (is_ready, self.inner.poll_ready(cx)) {
(true, Poll::Ready(t)) => Poll::Ready(t),
(false, _) => Poll::Pending,
(_, Poll::Pending) => Poll::Pending,
}
}
fn call(&mut self, mut request: Request<Body>) -> Self::Future {
tracing::debug!("Validating request...");
let clone = self.inner.clone();
let cloned_layer = self.layer.clone();
// Take the service that was ready!
let mut inner = std::mem::replace(&mut self.inner, clone);
let passthrough_mode = cloned_layer.passthrough_mode;
Box::pin(async move {
// Process the request.
let result = match extract::extract_jwt(&request, &cloned_layer.token_extractors) {
Some(token) => cloned_layer.validate_raw_token(&token).await,
None => Err(AuthError::MissingToken),
};
match result {
Ok((raw_claims, keycloak_token)) => {
if let Some(raw_claims) = raw_claims {
request.extensions_mut().insert(raw_claims);
}
match cloned_layer.passthrough_mode {
PassthroughMode::Block => {
request.extensions_mut().insert(keycloak_token);
}
PassthroughMode::Pass => {
request
.extensions_mut()
.insert(KeycloakAuthStatus::<R, Extra>::Success(keycloak_token));
}
};
inner.call(request).await
}
Err(err) => match passthrough_mode {
PassthroughMode::Block => Ok(err.into_response()),
PassthroughMode::Pass => {
request
.extensions_mut()
.insert(KeycloakAuthStatus::<R, Extra>::Failure(Arc::new(err)));
inner.call(request).await
}
},
}
})
}
}