Auth0 Refresh Token Metadata Polyfill

auth0-rt-metadata-polyfill.js

const refreshTokenSetMetadata = (key, value) => {
  if (useRefreshTokenMetadata) {
    api.refreshToken.setMetadata(key, value);
  } else {
    const rtIdentifier = event.refresh_token?.id ?? event.user.user_id;
    logLine(`Setting cache key RT:${rtIdentifier}:${key} to value: ${value}`);
    api.cache.set(`RT:${rtIdentifier}:${key}`, value, {
      ttl: 365 * 24 * 60 * 60 * 1000, // 1 year in milliseconds
    });
  }
  logLine(`Metadata check for ${key}: ${refreshTokenGetMetadata(key)}`);
};

const refreshTokenGetMetadata = (key) => {
  if (useRefreshTokenMetadata) {
    return event.refresh_token?.metadata?.[key];
  } else {
    const rtId = event.refresh_token?.id;
    const rtValue = api.cache.get(`RT:${rtId}:${key}`)?.value;
    if (rtId && rtValue) {
      console.log(`Using RT ID = RT:${rtId}:${key}; value = ${rtValue}`);
      return rtValue;
    }
    const userId = event.user.user_id;
    const userValue = api.cache.get(`RT:${userId}:${key}`)?.value;
    console.log(
      `Using User ID = RT:${userId}:${key}; value = ${userValue} (fallback since no RT ID)`
    );
    return userValue;
  }
};