क्रैश रिपोर्ट और डिवाइस इंटीग्रिटी

Copyasync function guard() {
  if (!(window.AppMint && AppMint.integrity)) return;          // browser, or option off
  const local = await AppMint.integrity.check();
  if (local.rooted) console.warn('rooted signals:', local.signals);

  const { nonce } = await fetch('/api/integrity/nonce').then(r => r.json());
  try {
    const token = await AppMint.integrity.token(nonce);          // project number from the build
    await fetch('/api/integrity/verify', { method: 'POST', body: token });
  } catch (e) {
    console.warn('Play Integrity unavailable:', e.message, e.code);
  }
}

Copyif (window.AppMint && AppMint.integrity) {
  const d = await AppMint.integrity.check();
  if (!d.installedFromPlay) console.log('installed by', d.installer || 'side-loaded');
  if (d.signatureSha256 && d.signatureSha256 !== MY_CERT_SHA256) reportTamper(d.signatureSha256);
}

Copyasync function getToken(nonce) {
  if (!(window.AppMint && AppMint.integrity)) return null;
  try {
    return await AppMint.integrity.token(nonce);
  } catch (e) {
    if (e.message === 'not_enabled') console.warn('Device integrity checks are off in this build');
    else if (e.message === 'nonce_too_short') console.warn('the server nonce must be longer');
    else console.warn('Play Integrity error', e.message, e.code);
    return null;
  }
}

Copyfunction deviceCheck() {
  if (!(window.WebToApk && window.WebToApk.getDeviceIntegrity)) return null;
  const r = JSON.parse(WebToApk.getDeviceIntegrity());
  if (r.error) return null;                       // 'not_enabled'
  return r;
}

const d = deviceCheck();
if (d && d.rooted) {
  showNotice('This phone looks rooted (' + d.signals.join(', ') + '). Some features are turned off.');
}
if (d && !d.installedFromPlay) console.log('installed by', d.installer || 'unknown (side-loaded)');

Copyconst MY_CERT = 'AB:CD:EF:…';   // Play Console → App integrity → App signing key SHA-256
const d = deviceCheck();
if (d && d.signatureSha256 && d.signatureSha256 !== MY_CERT) reportTamper();

Copywindow.addEventListener('appmint:integrity', function (e) {
  if (e.detail.error) { showNotice('Check failed: ' + e.detail.error); return; }
  fetch('https://api.example.com/verify', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ token: e.detail.token })
  });
});
if (window.WebToApk && WebToApk.requestIntegrityToken) {
  const nonce = crypto.randomUUID().replace(/-/g, '') + '0000';   // your server issues and checks this
  WebToApk.requestIntegrityToken(nonce, '123456789012');          // your Google Cloud project number
}

Copy(function () {
  if (!(window.WebToApk && window.WebToApk.getLastCrash)) return;
  const raw = WebToApk.getLastCrash();
  if (!raw) return;
  const crash = JSON.parse(raw);
  if (localStorage.getItem('seenCrash') === String(crash.at)) return;   // shown already
  localStorage.setItem('seenCrash', String(crash.at));
  showBanner('Sorry, the app closed unexpectedly last time. We have been told about it.');
})();

Copy(function () {
  if (!(window.WebToApk && WebToApk.getLastCrash)) return;
  const raw = WebToApk.getLastCrash();
  if (!raw) return;                         // no crash, or Crash reports are off
  const c = JSON.parse(raw);
  if (localStorage.getItem('sentCrash') === String(c.at)) return;
  fetch('https://api.example.com/crashes', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ kind: c.kind, message: c.message, version: c.appVersion, count: c.count })
  }).then(function () { localStorage.setItem('sentCrash', String(c.at)); });
})();

Copyconst raw = window.WebToApk && WebToApk.getLastCrash && WebToApk.getLastCrash();
if (raw) {
  const c = JSON.parse(raw);
  showBanner(c.kind === 'renderer'
    ? 'The page ran out of memory last time. Try closing other apps.'
    : 'The app closed unexpectedly last time.');
}

Copyfunction logError(err, context) {
  if (!(window.WebToApk && window.WebToApk.logError)) return false;   // browser, or an older build
  var msg = (context ? context + ': ' : '') + (err && err.message ? err.message : String(err));
  return WebToApk.logError(msg, (err && err.stack) || '');
}

async function checkout(cart) {
  try {
    await payments.charge(cart.total);
  } catch (err) {
    logError(err, 'checkout');          // shows up as "Logged by your page"
    showToast('Payment failed, please try again');
  }
}

Copyasync function api(path) {
  const res = await fetch('/api' + path);
  if (!res.ok && window.WebToApk && WebToApk.logError) {
    WebToApk.logError('API ' + res.status + ' ' + path.split('?')[0], '');
  }
  return res;
}

Copyif (window.WebToApk && WebToApk.setCrashUserId) WebToApk.setCrashUserId('user_' + currentUser.id);

try {
  JSON.parse(savedState);
} catch (err) {
  if (window.WebToApk && WebToApk.logError) {
    const logged = WebToApk.logError('state parse: ' + err.message, err.stack || '');
    if (!logged) console.warn('not recorded (Crash reports off, or repeated too often)');
  }
}

Copyasync function integrityToken() {
  // 1. Your server makes a one-time nonce: URL-safe Base64, 16-500 characters.
  const { nonce } = await fetch('/api/integrity/nonce').then(r => r.json());
  return new Promise((resolve, reject) => {
    const id = WebToApk.requestIntegrityToken(nonce, '');
    if (!id) return reject(new Error('not_enabled'));
    window.addEventListener('appmint:integrity', function on(e) {
      if (e.detail.requestId !== id) return;
      window.removeEventListener('appmint:integrity', on);
      e.detail.token ? resolve(e.detail.token) : reject(new Error(e.detail.error));
    });
  });
}

// 2. Your server decodes it with Google and decides.
const token = await integrityToken();
const verdict = await fetch('/api/integrity/verify', { method: 'POST', body: token }).then(r => r.json());

Copyconst p = decoded.tokenPayloadExternal;
const ok = p.requestDetails.nonce === issuedNonce &&
  p.appIntegrity.appRecognitionVerdict === 'PLAY_RECOGNIZED' &&
  p.deviceIntegrity.deviceRecognitionVerdict.includes('MEETS_DEVICE_INTEGRITY');

Copywindow.onAppMintIntegrity = function (d) {
  if (d.error) console.warn('integrity failed', d.error, d.code);
  else sendToServer(d.token);
};
WebToApk.requestIntegrityToken(nonceFromServer, '123456789012');

Copyfunction crashUser(id) {
  if (!(window.WebToApk && window.WebToApk.setCrashUserId)) return false;
  return WebToApk.setCrashUserId(id);
}

async function signIn(email, password) {
  const user = await myBackend.signIn(email, password);
  crashUser(user.id);            // e.g. 'u_42'
}

function signOut() {
  crashUser('');                 // later reports carry no user
}

Copyfunction setCrashUser(id) {
  if (!(window.WebToApk && WebToApk.setCrashUserId)) return;
  if (!WebToApk.setCrashUserId(id)) {
    console.warn('Crash user id not saved: bad characters, over 128 long, or Crash reports are off');
  }
}
setCrashUser('u_42');       // your database id, never an e-mail address

Copyif (window.WebToApk && WebToApk.getLastCrash) {
  const raw = WebToApk.getLastCrash();          // '' when there has been none
  if (raw) {
    const c = JSON.parse(raw);
    showMessage('Sorry, the app closed last time (' + c.kind + ').');
  }
}