v.1.0.0. initial push of license-lib

client/offline.js

@@ -0,0 +1,24 @@
+// client/offline.js
+
+const CACHE_KEY = 'license_data';
+
+export const cacheLicenseData = (licenseData) => {
+  localStorage.setItem(CACHE_KEY, JSON.stringify({
+    data: licenseData,
+    cachedAt: Date.now(),
+  }));
+};
+
+export const getCachedLicenseData = () => {
+  const item = localStorage.getItem(CACHE_KEY);
+  return item ? JSON.parse(item) : null;
+};
+
+export const isLicenseCacheValid = () => {
+  const cache = getCachedLicenseData();
+  if (!cache) return false;
+
+  const cachedAt = cache.cachedAt;
+  const elapsedDays = (Date.now() - cachedAt) / (1000 * 60 * 60 * 24);
+  return elapsedDays <= CONFIG.OFFLINE_GRACE_PERIOD_DAYS;
+};