goldenChat base source add

frontend/src/utils/auth.ts

@@ -0,0 +1,50 @@
+/**
+ * 로그인 세션 (localStorage).
+ * - 미로그인: X-Device-Id 만 전송 → 기존과 동일 (기기별 설정)
+ * - 로그인: X-User-Id 전송 → 사용자별 DB 설정 공유
+ */
+
+import type { UserRole } from './permissions';
+import { normalizeRole } from './permissions';
+
+export interface AuthSession {
+  userId: number;
+  username: string;
+  displayName: string;
+  role: UserRole;
+}
+
+const USER_ID_KEY = 'gc_user_id';
+const USERNAME_KEY = 'gc_username';
+const DISPLAY_NAME_KEY = 'gc_display_name';
+const ROLE_KEY = 'gc_user_role';
+
+export function getAuthSession(): AuthSession | null {
+  const id = localStorage.getItem(USER_ID_KEY);
+  if (!id) return null;
+  const userId = Number(id);
+  if (!Number.isFinite(userId) || userId <= 0) return null;
+  const username = localStorage.getItem(USERNAME_KEY) ?? '';
+  const displayName = localStorage.getItem(DISPLAY_NAME_KEY) ?? username;
+  const storedRole = localStorage.getItem(ROLE_KEY);
+  const role = normalizeRole(storedRole ?? 'USER');
+  return { userId, username, displayName, role };
+}
+
+export function setAuthSession(session: AuthSession): void {
+  localStorage.setItem(USER_ID_KEY, String(session.userId));
+  localStorage.setItem(USERNAME_KEY, session.username);
+  localStorage.setItem(DISPLAY_NAME_KEY, session.displayName);
+  localStorage.setItem(ROLE_KEY, session.role);
+}
+
+export function clearAuthSession(): void {
+  localStorage.removeItem(USER_ID_KEY);
+  localStorage.removeItem(USERNAME_KEY);
+  localStorage.removeItem(DISPLAY_NAME_KEY);
+  localStorage.removeItem(ROLE_KEY);
+}
+
+export function isLoggedIn(): boolean {
+  return getAuthSession() !== null;
+}