LowTechFilter/Surge/check_futadns.js

const { v4, v6 } = $network;

const errorMessage = {
  title: 'FutaDNS',
  content: '無已被設定的 FutaGuard DNS 伺服器',
  icon: 'xmark.shield.fill',
  'icon-color': '#FE6245',
};

const successMessage = {
  title: 'FutaDNS',
  content: '已指定的 FutaGuard DNS 伺服器\n正在正確地運作',
  icon: 'checkmark.shield.fill',
  'icon-color': '#1FCFB4',
};

if (!v4.primaryAddress && !v6.primaryAddress) {
  $done(errorMessage);
} else {
  $httpClient.get('https://check.futa.gg', function (error, response, data) {
    if (error) {
      $done(errorMessage);
    }
    if (data.includes('正在正確地運作')) {
      $done(successMessage);
    }
    $done(errorMessage);
  });
}