v1.ts

enum DetectionMethod {
  "ip-only" = "ip-only",
  "timezone-then-ip" = "timezone-then-ip",
}

var redirectRussia = () => {
  // How it works:
  // (1) We detect your timezone to estimate if you're in Russia
  // (2) If we think you may be, we make an IP address geolocation API request to confirm
  // (3) If you are in indeed in Russia, we redirect you to a pro-Ukraine website

  var currentScript = document.currentScript;
  if (!currentScript) return;

  // Find the redirection URL
  var REDIRECT_URL =
    currentScript.getAttribute("data-redirect-url") ??
    `https://redirectrussia.org/${
      currentScript.getAttribute("data-hide-domain") === "hide"
        ? "?from=unknown"
        : `?from=${document.domain}`
    }`;

  var redirect = () => {
    try {
      // Dispatch a custom event
      // To listen to this event, you can add the following JavaScript:
      // document.addEventListener("redirect-russia", (event) => { /* */ }, false);
      var event = new Event("redirect-russia");
      document.dispatchEvent(event);

      // Set in session storage so we don't have to compute again
      window.sessionStorage.setItem("russia-redirect", "1");
    } catch (error) {
      // Ignore errors in storage or events
    }
    window.location.assign(REDIRECT_URL);
  };

  // Cache redirection status in session storage to avoid expensive computation
  try {
    var shouldRedirect = window.sessionStorage.getItem("russia-redirect");
    // If we already computed to redirect you, do it immediately
    if (shouldRedirect === "1") return redirect();
    // If we already skipped you, no need to redo the detection
    else if (shouldRedirect === "0") return;
  } catch (error) {
    // Ignore storage access errors
  }

  // Find the preferred method of location detection
  var detectionMethod =
    currentScript.getAttribute("data-detection") ??
    DetectionMethod["timezone-then-ip"];

  // If we find an unsupported method, throw an error
  if (
    detectionMethod !== DetectionMethod["ip-only"] &&
    detectionMethod !== DetectionMethod["timezone-then-ip"]
  )
    throw new Error("Redirect Russia: Unsupported location detection method");

  // By default, we assume that you're in Russia
  var mayBeRussian = true;

  // If the timezone-then-ip detection method is set
  if (detectionMethod === DetectionMethod["timezone-then-ip"]) {
    // Find the current timezone
    var currentTimezone: string | undefined = undefined;
    try {
      currentTimezone = Intl.DateTimeFormat().resolvedOptions().timeZone;
    } catch (error) {
      // Ignore errors if `Intl` is unavailable or we're unable to find the timezone
    }

    var RUSSIAN_TIMEZONES = [
      "Asia/Anadyr",
      "Asia/Barnaul",
      "Asia/Chita",
      "Asia/Irkutsk",
      "Asia/Kamchatka",
      "Asia/Khandyga",
      "Asia/Krasnoyarsk",
      "Asia/Magadan",
      "Asia/Novokuznetsk",
      "Asia/Novosibirsk",
      "Asia/Omsk",
      "Asia/Sakhalin",
      "Asia/Srednekolymsk",
      "Asia/Tomsk",
      "Asia/Ust",
      "Asia/Vladivostok",
      "Asia/Yakutsk",
      "Asia/Yekaterinburg",
      "Europe/Astrakhan",
      "Europe/Kaliningrad",
      "Europe/Kirov",
      "Europe/Moscow",
      "Europe/Samara",
      "Europe/Saratov",
      "Europe/Simferopol", // This timezone is also in Ukraine
      "Europe/Ulyanovsk",
      "Europe/Volgograd",
    ];

    if (
      // If we're unable to find the timezone, you may be in Russia
      currentTimezone &&
      // If you're in a Russian timezone, you may be in Russia
      !RUSSIAN_TIMEZONES.includes(currentTimezone)
    )
      mayBeRussian = false;
  }

  if (!mayBeRussian) return;

  var geolocationEndpoint =
    currentScript.getAttribute("data-geolocation-api") ??
    "https://api.country.is";

  var countryCode: string | undefined = undefined; // Uppercase country code, e.g., "UA" or "DE"
  // Make IP geolocation request
  fetch(geolocationEndpoint)
    .then((response) => {
      if (!response.ok) throw new Error("Response not OK");
      return response.json();
    })
    .then((json) => {
      countryCode = json.country.toLowerCase();
    })
    // Ignore errors if we're unable to fetch
    .catch(() => undefined)
    .then(() => {
      if (countryCode === "ru") return redirect();

      try {
        // Set in session storage so we don't have to compute again
        window.sessionStorage.setItem("russia-redirect", "0");
      } catch (error) {
        // Ignore storage access errors
      }
    });
};

void redirectRussia();