swarm: changes taken unjudged, dropped (REFUSALS)

A node refusing changes a peer brought tells it which broke a rule; the
peer judges them itself, and if its rules refuse them too, drops them
with all built on them (its document forked without them, a fresh
actor), quarantining its own writes among them. Wire version 42.

Auth plan M6 (rejoin on taint).

1 files changed, 10 insertions, 0 deletions

diff --git a/src/swarm/peer/inbound.rs b/src/swarm/peer/inbound.rs
index 9b5db8f..a7633b3 100644
--- a/src/swarm/peer/inbound.rs
+++ b/src/swarm/peer/inbound.rs
@@ -272,6 +272,16 @@ pub(crate) async fn handle_message(
                 crate::swarm::signatures::received(state, message).await;
             }
         }
+        transport::ParsedMessage::Refusals(message) => {
+            // From members, of our epoch: judging costs (`swarm::refusals`).
+            let member = matches!(
+                peer_state.lock().await.standing,
+                crate::state::Standing::Member { .. }
+            );
+            if member && same_epoch {
+                crate::swarm::refusals::received(state, &peer, message).await;
+            }
+        }
         transport::ParsedMessage::Probe(request) => {
             crate::swarm::working_links::answer(state, &peer, request).await;
         }