Feature/get public keys (#59)

* add /api/v1/eth2/publicKeys endpoint for compatibility with validator clients

* add file

src/bin/validator.rs

@@ -48,6 +48,13 @@ async fn main() {
                 puffersecuresigner::enclave::shared::handlers::list_bls_keys::handler,
             ),
         )
+        // Endpoint to list all bls pubkeys - used by the validator client
+        .route(
+            "/api/v1/eth2/publicKeys",
+            axum::routing::get(
+                puffersecuresigner::enclave::shared::handlers::list_bls_keys_for_vc::handler,
+            ),
+        )
         // Endpoint to request a signature using BLS sk
         .route(
             "/api/v1/eth2/sign/:bls_pk_hex",

src/enclave/shared/handlers/list_bls_keys_for_vc.rs

@@ -0,0 +1,22 @@
+use axum::{response::IntoResponse, Json};
+use log::{error, info};
+
+use crate::{io::key_management, strip_0x_prefix};
+
+pub async fn handler() -> axum::response::Response {
+    info!("list_bls_keys_for_vc()");
+    match key_management::list_bls_keys() {
+        Ok(list_res) => {
+            // safely prepend the response with "0x" to match the expected format
+            let list_res = list_res.iter().map(|x| {
+                let stripped: &str = strip_0x_prefix!(x);
+                format!("0x{}", stripped)
+            }).collect::<Vec<String>>();
+            (axum::http::status::StatusCode::OK, Json(list_res)).into_response()
+        }
+        Err(e) => {
+            error!("list_bls_keys_for_vc() failed with: {:?}", e);
+            axum::http::status::StatusCode::INTERNAL_SERVER_ERROR.into_response()
+        }
+    }
+}

src/enclave/shared/handlers/mod.rs

@@ -1,5 +1,6 @@
 pub mod health;
 pub mod list_bls_keys;
+pub mod list_bls_keys_for_vc;
 pub mod list_eth_keys;
 pub mod secure_sign_bls;