릴리스: v1.4.33 가입 검증과 테마 기본값 정리

backend/src/lib/user-validation.js

@@ -0,0 +1,48 @@
+const RESERVED_NICKNAME_KEYWORDS = [
+  'admin',
+  'administrator',
+  'operator',
+  'owner',
+  'master',
+  'staff',
+  'system',
+  'root',
+  'support',
+  'manager',
+  'mod',
+  'moderator',
+  'official',
+  'service',
+  'team',
+  'zenn',
+  '운영자',
+  '관리자',
+  '오너',
+  '마스터',
+  '스태프',
+  '시스템',
+  '루트',
+  '서포트',
+  '매니저',
+  '모더레이터',
+  '공식',
+]
+
+function normalizeNickname(value) {
+  return String(value || '')
+    .trim()
+    .toLowerCase()
+    .replace(/\s+/g, '')
+}
+
+function isReservedNickname(value) {
+  const normalized = normalizeNickname(value)
+  if (!normalized) return false
+  return RESERVED_NICKNAME_KEYWORDS.some((keyword) => normalized.includes(normalizeNickname(keyword)))
+}
+
+module.exports = {
+  RESERVED_NICKNAME_KEYWORDS,
+  normalizeNickname,
+  isReservedNickname,
+}