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function isSessionValid() {
  return (request.auth.token.auth_time + (60 * 60 * 24 * 30)) * 1000 > request.time.toMillis();
}

allow read: if isSessionValid();

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allow read: if (request.auth.token.auth_time + (60 * 60 * 24 * 30)) * 1000 > request.time.toMillis();

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allow read: if request.auth.token.expiresAt > request.time.toMillis();

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".read": "(auth.token.auth_time + (60 * 60 * 24 * 30)) * 1000 > now"

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".read": "auth.token.expiresAt > now"

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admin.auth().createCustomToken(uid, {
  // Add a custom claim indicating an expiration time of 30 days.
  expiresAt: Date.now() + (1000 * 60 * 60 * 24 * 30),
})
  .then((customToken) => {
    // Send token back to client for authentication...
  })
  .catch((error) => {
    console.log("Failed to create custom token:", error);
  });

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const auth = admin.auth();
auth.onAuthStateChanged((user) => {
  let sessionTimeout = null;
  if (user === null) {
    // User is logged out.
    // Clear the session timeout.
    sessionTimeout && clearTimeout(sessionTimeout);
    sessionTimeout = null;
  } else {
    // User is logged in.

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