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packages/shared/src/auth.ts

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+import { storageGetSync, storageRemove, storageSetSync } from './storage/index.js';
+
+export type UserRole = 'ADMIN' | 'USER';
+
+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';
+
+function normalizeRole(role: string): UserRole {
+  return role === 'ADMIN' ? 'ADMIN' : 'USER';
+}
+
+export function getAuthSession(): AuthSession | null {
+  const id = storageGetSync(USER_ID_KEY);
+  if (!id) return null;
+  const userId = Number(id);
+  if (!Number.isFinite(userId) || userId <= 0) return null;
+  const username = storageGetSync(USERNAME_KEY) ?? '';
+  const displayName = storageGetSync(DISPLAY_NAME_KEY) ?? username;
+  const storedRole = storageGetSync(ROLE_KEY);
+  const role = normalizeRole(storedRole ?? 'USER');
+  return { userId, username, displayName, role };
+}
+
+export function setAuthSession(session: AuthSession): void {
+  storageSetSync(USER_ID_KEY, String(session.userId));
+  storageSetSync(USERNAME_KEY, session.username);
+  storageSetSync(DISPLAY_NAME_KEY, session.displayName);
+  storageSetSync(ROLE_KEY, session.role);
+}
+
+export async function clearAuthSession(): Promise<void> {
+  await storageRemove(USER_ID_KEY);
+  await storageRemove(USERNAME_KEY);
+  await storageRemove(DISPLAY_NAME_KEY);
+  await storageRemove(ROLE_KEY);
+}
+
+export function isLoggedIn(): boolean {
+  return getAuthSession() !== null;
+}