Telegram oauth

telegramoauth.ts

const openTgWindow = (options: {
  bot_id: string;
  request_access?: boolean;
  lang?: string;
}, callback) => {
  let timeoutId = null;

  const popup_url =
    'https://oauth.telegram.org/auth?bot_id=' +
    encodeURIComponent(options.bot_id) +
    '&origin=' +
    encodeURIComponent(
      location.origin || location.protocol + '//' + location.hostname
    ) +
    (options.request_access
      ? '&request_access=' + encodeURIComponent(options.request_access)
      : '') +
    (options.lang ? '&lang=' + encodeURIComponent(options.lang) : '');

  const checkClose = (window: Window) => {
    if (!window || window.closed) {
      return getAuthData({ bot_id: options.bot_id }, (authData) => {
        callback(authData);
      });
    } else {
      timeoutId = setTimeout(() => checkClose(window), 100);
    }
  };

  const popup = window.open(popup_url);

  checkClose(popup);

  window.addEventListener('message', (event) => {
    let data;

    if (event.source !== popup) return;

    try {
      data = JSON.parse(event.data);
    } catch (e) {
      data = {};
    }

    if (data.event == 'auth_result') {
      clearTimeout(timeoutId);
      callback(data.result);
    }
  });

  return popup;
};

const getAuthData = (options: { bot_id: string; lang?: string }, callback) => {
  const xhr = new XMLHttpRequest();
  const url = 'https://oauth.telegram.org/auth/get';
  xhr.open('POST', url);
  xhr.setRequestHeader(
    'Content-Type',
    'application/x-www-form-urlencoded; charset=UTF-8'
  );
  xhr.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
  xhr.onreadystatechange = () => {
    if (xhr.readyState == 4) {
      if (xhr.responseText) {
        let result;
        try {
          result = JSON.parse(xhr.responseText);
        } catch (e) {
          result = {};
        }
        if (result.user) {
          callback(result.user);
        } else {
          callback(false);
        }
      } else {
        callback(false);
      }
    }
  };
  xhr.onerror = () => {
    callback(false);
  };
  xhr.withCredentials = true;
  xhr.send(
    'bot_id=' +
      encodeURIComponent(options.bot_id) +
      (options.lang ? '&lang=' + encodeURIComponent(options.lang) : '')
  );
};