Remove VC response signing and fix HTTP error handling (#5529)

* and_then to then
remove expect
move convert_rejection to utils
remove signer from vc api

* remove key

* remove auth header

* revert

* Merge branch 'unstable' of https://github.com/sigp/lighthouse into vc-api-fix

* merge unstable

* revert

* Merge branch 'unstable' of https://github.com/sigp/lighthouse into vc-api-fix

* Merge branch 'unstable' of https://github.com/sigp/lighthouse into vc-api-fix

* refactor blocking json task

* linting

* revert logging

* remove response signing checks in validtor http_api client

* remove notion of public key, prefixes, and simplify token generation

* fmt

* Remove outdated comment on public key

common/warp_utils/src/reject.rs

@@ -2,7 +2,7 @@ use eth2::types::{ErrorMessage, Failure, IndexedErrorMessage};
 use std::convert::Infallible;
 use std::error::Error;
 use std::fmt;
-use warp::{http::StatusCode, reject::Reject};
+use warp::{http::StatusCode, reject::Reject, reply::Response, Reply};
 
 #[derive(Debug)]
 pub struct ServerSentEventError(pub String);
@@ -255,3 +255,21 @@ pub async fn handle_rejection(err: warp::Rejection) -> Result<impl warp::Reply,
 
     Ok(warp::reply::with_status(json, code))
 }
+
+/// Convert a warp `Rejection` into a `Response`.
+///
+/// This function should *always* be used to convert rejections into responses. This prevents warp
+/// from trying to backtrack in strange ways. See: https://github.com/sigp/lighthouse/issues/3404
+pub async fn convert_rejection<T: Reply>(res: Result<T, warp::Rejection>) -> Response {
+    match res {
+        Ok(response) => response.into_response(),
+        Err(e) => match handle_rejection(e).await {
+            Ok(reply) => reply.into_response(),
+            Err(_) => warp::reply::with_status(
+                warp::reply::json(&"unhandled error"),
+                eth2::StatusCode::INTERNAL_SERVER_ERROR,
+            )
+            .into_response(),
+        },
+    }
+}

common/warp_utils/src/task.rs

@@ -1,3 +1,4 @@
+use crate::reject::convert_rejection;
 use serde::Serialize;
 use warp::reply::{Reply, Response};
 
@@ -24,14 +25,16 @@ where
 }
 
 /// A convenience wrapper around `blocking_task` for use with `warp` JSON responses.
-pub async fn blocking_json_task<F, T>(func: F) -> Result<Response, warp::Rejection>
+pub async fn blocking_json_task<F, T>(func: F) -> Response
 where
     F: FnOnce() -> Result<T, warp::Rejection> + Send + 'static,
     T: Serialize + Send + 'static,
 {
-    blocking_response_task(|| {
+    let result = blocking_response_task(|| {
         let response = func()?;
         Ok(warp::reply::json(&response))
     })
-    .await
+    .await;
+
+    convert_rejection(result).await
 }