public 기능 완료

backend/utils/publicJwt.js

@@ -0,0 +1,12 @@
+// utils/publicJwt.js
+const jwt = require('jsonwebtoken');
+const SECRET = process.env.PUBLIC_EVENT_JWT_SECRET || 'default_public_event_secret';
+
+exports.signPublicEventToken = (payload) => {
+  const token = jwt.sign(payload, SECRET, { expiresIn: '2h' });
+  return token;
+};
+exports.verifyPublicEventToken = (token) => {
+  const decoded = jwt.verify(token, SECRET);
+  return decoded;
+};