From f03b4dd87fdc9a56e4ef652ccdb9213f7553e97c Mon Sep 17 00:00:00 2001
From: Michael Lumish <mlumish@google.com>
Date: Tue, 20 Jul 2021 14:12:59 -0700
Subject: [PATCH] Validate uniqueness of http filter names

---
 packages/grpc-js-xds/src/xds-stream-state/rds-state.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/packages/grpc-js-xds/src/xds-stream-state/rds-state.ts b/packages/grpc-js-xds/src/xds-stream-state/rds-state.ts
index 9441a7ec..0322218d 100644
--- a/packages/grpc-js-xds/src/xds-stream-state/rds-state.ts
+++ b/packages/grpc-js-xds/src/xds-stream-state/rds-state.ts
@@ -141,7 +141,12 @@ export class RdsState implements XdsStreamState<RouteConfiguration__Output> {
           return false;
         }
         if (EXPERIMENTAL_FAULT_INJECTION) {
-          for (const filterConfig of Object.values(route.typed_per_filter_config ?? {})) {
+          const filterNames = new Set<string>();
+          for (const [name, filterConfig] of Object.entries(route.typed_per_filter_config ?? {})) {
+            if (filterNames.has(name)) {
+              return false;
+            }
+            filterNames.add(name);
             if (!validateOverrideFilter(filterConfig)) {
               return false;
             }