v.1.0.0. initial push of license-lib

client/config.js

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+// client/config.js
+
+export const CONFIG = {
+    LICENSE_API_URL: 'http://localhost:3000', // backend API URL
+    OFFLINE_GRACE_PERIOD_DAYS: 14,
+  };
+  

client/index.js

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+// client/index.js
+
+export { activateLicense } from './validate';
+export { cacheLicenseData, getCachedLicenseData, isLicenseCacheValid } from './offline';
+export { generateFingerprint } from './utils/fingerprint';
+export { CONFIG } from './config';

client/offline.js

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+// 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;
+};

client/utils/fingerprint.js

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+// client/utils/fingerprint.js
+
+export const generateFingerprint = () => {
+    return btoa(navigator.userAgent + navigator.language + screen.width + screen.height);
+  };
+  

client/validate.js

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+// client/validate.js
+
+import { CONFIG } from './config';
+
+export const activateLicense = async (userId, licenseKey) => {
+  const response = await fetch(`${CONFIG.LICENSE_API_URL}/validate-license`, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({ userId, licenseKey }),
+  });
+
+  const { valid } = await response.json();
+  return valid;
+};