goldenChat base source add

frontend/src/utils/stompMessage.ts

@@ -0,0 +1,21 @@
+import type { IMessage } from '@stomp/stompjs';
+
+/** STOMP MESSAGE body — 텍스트·바이너리(UTF-8 JSON) 모두 처리 */
+export function stompMessageBody(msg: IMessage): string {
+  if (msg.body && msg.body.length > 0) return msg.body;
+  const bin = msg.binaryBody;
+  if (bin && bin.length > 0) {
+    return new TextDecoder('utf-8').decode(bin);
+  }
+  return '';
+}
+
+export function parseStompJson<T>(msg: IMessage): T | null {
+  const raw = stompMessageBody(msg);
+  if (!raw) return null;
+  try {
+    return JSON.parse(raw) as T;
+  } catch {
+    return null;
+  }
+}