From 227043b918215b0e1b66c8bb3d94bf1354fc2b47 Mon Sep 17 00:00:00 2001
From: Roman Zabaluev <gpg@haarolean.dev>
Date: Thu, 9 Jan 2025 23:00:17 +0700
Subject: [PATCH] BE: Auth: Fix startup error on missing (non-prod profile)
 index.html

---
 .../main/java/io/kafbat/ui/util/StaticFileWebFilter.java  | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/api/src/main/java/io/kafbat/ui/util/StaticFileWebFilter.java b/api/src/main/java/io/kafbat/ui/util/StaticFileWebFilter.java
index 1b74bd374..f76ffad6b 100644
--- a/api/src/main/java/io/kafbat/ui/util/StaticFileWebFilter.java
+++ b/api/src/main/java/io/kafbat/ui/util/StaticFileWebFilter.java
@@ -1,6 +1,7 @@
 package io.kafbat.ui.util;
 
 import java.io.IOException;
+import lombok.extern.slf4j.Slf4j;
 import org.jetbrains.annotations.NotNull;
 import org.springframework.core.io.ClassPathResource;
 import org.springframework.core.io.buffer.DataBufferFactory;
@@ -15,6 +16,7 @@
 import org.springframework.web.server.WebFilterChain;
 import reactor.core.publisher.Mono;
 
+@Slf4j
 public class StaticFileWebFilter implements WebFilter {
 
   private static final String INDEX_HTML = "/static/index.html";
@@ -29,6 +31,12 @@ public StaticFileWebFilter() {
   public StaticFileWebFilter(String path, ClassPathResource resource) {
     this.matcher = ServerWebExchangeMatchers.pathMatchers(HttpMethod.GET, path);
 
+    if (!resource.exists()) {
+      log.warn("Resource [{}] does not exist. Frontend might not be available.", resource.getPath());
+      contents = "Missing index.html. Make sure the app has been built with a correct (prod) profile.";
+      return;
+    }
+
     try {
       this.contents = ResourceUtil.readAsString(resource);
     } catch (IOException e) {