telegram-crawler/data/web/telegram.org/js/telegram-web-app.js

// WebView
(function () {
  var eventHandlers = {};

  var locationHash = '';
  try {
    locationHash = location.hash.toString();
  } catch (e) {}

  var initParams = urlParseHashParams(locationHash);

  var isIframe = false, iFrameStyle;
  try {
    isIframe = (window.parent != null && window != window.parent);
    if (isIframe) {
      window.addEventListener('message', function (event) {
        if (event.source !== window.parent) return;
        try {
          var dataParsed = JSON.parse(event.data);
        } catch (e) {
          return;
        }
        if (!dataParsed || !dataParsed.eventType) {
          return;
        }
        if (dataParsed.eventType == 'set_custom_style') {
          iFrameStyle.innerHTML = dataParsed.eventData;
        } else {
          receiveEvent(dataParsed.eventType, dataParsed.eventData);
        }
      });
      iFrameStyle = document.createElement('style');
      document.head.appendChild(iFrameStyle);
      try {
        window.parent.postMessage(JSON.stringify({eventType: 'iframe_ready'}), '*');
      } catch (e) {}
    }
  } catch (e) {}

  function urlSafeDecode(urlencoded) {
    try {
      urlencoded = urlencoded.replace(/\+/g, '%20');
      return decodeURIComponent(urlencoded);
    } catch (e) {
      return urlencoded;
    }
  }

  function urlParseHashParams(locationHash) {
    locationHash = locationHash.replace(/^#/, '');
    var params = {};
    if (!locationHash.length) {
      return params;
    }
    if (locationHash.indexOf('=') < 0 && locationHash.indexOf('?') < 0) {
      params._path = urlSafeDecode(locationHash);
      return params;
    }
    var qIndex = locationHash.indexOf('?');
    if (qIndex >= 0) {
      var pathParam = locationHash.substr(0, qIndex);
      params._path = urlSafeDecode(pathParam);
      locationHash = locationHash.substr(qIndex + 1);
    }
    var query_params = urlParseQueryString(locationHash);
    for (var k in query_params) {
      params[k] = query_params[k];
    }
    return params;
  }

  function urlParseQueryString(queryString) {
    var params = {};
    if (!queryString.length) {
      return params;
    }
    var queryStringParams = queryString.split('&');
    var i, param, paramName, paramValue;
    for (i = 0; i < queryStringParams.length; i++) {
      param = queryStringParams[i].split('=');
      paramName = urlSafeDecode(param[0]);
      paramValue = param[1] == null ? null : urlSafeDecode(param[1]);
      params[paramName] = paramValue;
    }
    return params;
  }

  // Telegram apps will implement this logic to add service params (e.g. tgShareScoreUrl) to game URL
  function urlAppendHashParams(url, addHash) {
    // url looks like 'https://game.com/path?query=1#hash'
    // addHash looks like 'tgShareScoreUrl=' + encodeURIComponent('tgb://share_game_score?hash=telegram-crawler_long_hash123')

    var ind = url.indexOf('#');
    if (ind < 0) {
      // https://game.com/path -> https://game.com/path#tgShareScoreUrl=etc
      return url + '#' + addHash;
    }
    var curHash = url.substr(ind + 1);
    if (curHash.indexOf('=') >= 0 || curHash.indexOf('?') >= 0) {
      // https://game.com/#hash=1 -> https://game.com/#hash=1&tgShareScoreUrl=etc
      // https://game.com/#path?query -> https://game.com/#path?query&tgShareScoreUrl=etc
      return url + '&' + addHash;
    }
    // https://game.com/#hash -> https://game.com/#hash?tgShareScoreUrl=etc
    if (curHash.length > 0) {
      return url + '?' + addHash;
    }
    // https://game.com/# -> https://game.com/#tgShareScoreUrl=etc
    return url + addHash;
  }

  function postEvent(eventType, callback, eventData) {
    if (!callback) {
      callback = function () {};
    }
    if (eventData === undefined) {
      eventData = '';
    }

    if (window.TelegramWebviewProxy !== undefined) {
      TelegramWebviewProxy.postEvent(eventType, JSON.stringify(eventData));
      callback();
    }
    else if (window.external && 'notify' in window.external) {
      window.external.notify(JSON.stringify({eventType: eventType, eventData: eventData}));
      callback();
    }
    else if (isIframe) {
      try {
        var trustedTarget = 'https://web.telegram.org';
        // For now we don't restrict target, for testing purposes
        trustedTarget = '*';
        window.parent.postMessage(JSON.stringify({eventType: eventType, eventData: eventData}), trustedTarget);
        if (initParams.tgWebAppDebug) {
          console.log('[Telegram.WebView] postEvent via postMessage', eventType, eventData);
        }
        callback();
      } catch (e) {
        callback(e);
      }
    }
    else {
      if (initParams.tgWebAppDebug) {
        console.log('[Telegram.WebView] postEvent', eventType, eventData);
      }
      callback({notAvailable: true});
    }
  };

  function receiveEvent(eventType, eventData) {
    callEventCallbacks(eventType, function(callback) {
      callback(eventType, eventData);
    });
  }

  function callEventCallbacks(eventType, func) {
    var curEventHandlers = eventHandlers[eventType];
    if (curEventHandlers === undefined ||
        !curEventHandlers.length) {
      return;
    }
    for (var i = 0; i < curEventHandlers.length; i++) {
      try {
        func(curEventHandlers[i]);
      } catch (e) {}
    }
  }

  function onEvent(eventType, callback) {
    if (eventHandlers[eventType] === undefined) {
      eventHandlers[eventType] = [];
    }
    var index = eventHandlers[eventType].indexOf(callback);
    if (index === -1) {
      eventHandlers[eventType].push(callback);
    }
  };

  function offEvent(eventType, callback) {
    if (eventHandlers[eventType] === undefined) {
      return;
    }
    var index = eventHandlers[eventType].indexOf(callback);
    if (index === -1) {
      return;
    }
    eventHandlers[eventType].splice(index, 1);
  };

  function openProtoUrl(url) {
    if (!url.match(/^(web\+)?tgb?:\/\/./)) {
      return false;
    }
    var useIframe = navigator.userAgent.match(/iOS|iPhone OS|iPhone|iPod|iPad/i) ? true : false;
    if (useIframe) {
      var iframeContEl = document.getElementById('tgme_frame_cont') || document.body;
      var iframeEl = document.createElement('iframe');
      iframeContEl.appendChild(iframeEl);
      var pageHidden = false;
      var enableHidden = function () {
        pageHidden = true;
      };
      window.addEventListener('pagehide', enableHidden, false);
      window.addEventListener('blur', enableHidden, false);
      if (iframeEl !== null) {
        iframeEl.src = url;
      }
      setTimeout(function() {
        if (!pageHidden) {
          window.location = url;
        }
        window.removeEventListener('pagehide', enableHidden, false);
        window.removeEventListener('blur', enableHidden, false);
      }, 2000);
    }
    else {
      window.location = url;
    }
    return true;
  }

  if (!window.Telegram) {
    window.Telegram = {};
  }
  window.Telegram.WebView = {
    initParams: initParams,
    isIframe: isIframe,
    onEvent: onEvent,
    offEvent: offEvent,
    postEvent: postEvent,
    receiveEvent: receiveEvent,
    callEventCallbacks: callEventCallbacks
  };

  window.Telegram.Utils = {
    urlSafeDecode: urlSafeDecode,
    urlParseQueryString: urlParseQueryString,
    urlParseHashParams: urlParseHashParams,
    urlAppendHashParams: urlAppendHashParams
  };

  // For Windows Phone app
  window.TelegramGameProxy_receiveEvent = receiveEvent;

  // App backward compatibility
  window.TelegramGameProxy = {
    receiveEvent: receiveEvent
  };
})();

// WebApp
(function () {
  var Utils = window.Telegram.Utils;
  var WebView = window.Telegram.WebView;
  var initParams = WebView.initParams;
  var isIframe = WebView.isIframe;

  var WebApp = {};
  var webAppInitData = '', webAppInitDataUnsafe = {};
  var themeParams = {}, colorScheme = 'light';
  var webAppVersion = '6.0';

  if (initParams.tgWebAppData && initParams.tgWebAppData.length) {
    webAppInitData = initParams.tgWebAppData;
    webAppInitDataUnsafe = Utils.urlParseQueryString(webAppInitData);
    for (var key in webAppInitDataUnsafe) {
      var val = webAppInitDataUnsafe[key];
      try {
        if (val.substr(0, 1) == '{' && val.substr(-1) == '}' ||
            val.substr(0, 1) == '[' && val.substr(-1) == ']') {
          webAppInitDataUnsafe[key] = JSON.parse(val);
        }
      } catch (e) {}
    }
  }
  if (initParams.tgWebAppThemeParams && initParams.tgWebAppThemeParams.length) {
    var themeParamsRaw = initParams.tgWebAppThemeParams;
    try {
      var theme_params = JSON.parse(themeParamsRaw);
      setThemeParams(theme_params);
    } catch (e) {}
  }
  if (initParams.tgWebAppVersion) {
    webAppVersion = initParams.tgWebAppVersion;
  }

  function onThemeChanged(eventType, eventData) {
    if (eventData.theme_params) {
      setThemeParams(eventData.theme_params);
      window.Telegram.WebApp.MainButton.setParams({
        force_update: true
      });
      receiveWebViewEvent('themeChanged');
    }
  }

  var lastWindowHeight = window.innerHeight;
  function onViewportChanged(eventType, eventData) {
    if (eventData.height) {
      window.removeEventListener('resize', onWindowResize);
      setViewportHeight(eventData);
    }
  }

  function onWindowResize(e) {
    if (lastWindowHeight != window.innerHeight) {
      lastWindowHeight = window.innerHeight;
      receiveWebViewEvent('viewportChanged', {
        isStateStable: true
      });
    }
  }

  function linkHandler(e) {
    if (e.metaKey || e.ctrlKey) return;
    var el = e.target;
    while (el.tagName != 'A' && el.parentNode) {
      el = el.parentNode;
    }
    if (el.tagName == 'A' &&
        el.target != '_blank' &&
        (el.protocol == 'http:' || el.protocol == 'https:') &&
        el.hostname == 't.me') {
      WebApp.openTgLink(el.href);
      e.preventDefault();
    }
  }

  function receiveWebViewEvent(eventType) {
    var args = Array.prototype.slice.call(arguments);
    eventType = args.shift();
    WebView.callEventCallbacks('webview:' + eventType, function(callback) {
      callback.apply(WebApp, args);
    });
  }

  function onWebViewEvent(eventType, callback) {
    WebView.onEvent('webview:' + eventType, callback);
  };

  function offWebViewEvent(eventType, callback) {
    WebView.offEvent('webview:' + eventType, callback);
  };

  function setCssProperty(name, value) {
    var root = document.documentElement;
    if (root && root.style && root.style.setProperty) {
      root.style.setProperty('--tg-' + name, value);
    }
  }

  function setThemeParams(theme_params) {
    var color;
    for (var key in theme_params) {
      if (color = parseColorToHex(theme_params[key])) {
        themeParams[key] = color;
        if (key == 'bg_color') {
          colorScheme = isColorDark(color) ? 'dark' : 'light'
          setCssProperty('color-scheme', colorScheme);
        }
        key = 'theme-' + key.split('_').join('-');
        setCssProperty(key, color);
      }
    }
  }

  var viewportHeight = false, viewportStableHeight = false, isExpanded = true;
  function setViewportHeight(data) {
    if (typeof data !== 'undefined') {
      isExpanded = !!data.is_expanded;
      viewportHeight = data.height;
      if (data.is_state_stable) {
        viewportStableHeight = data.height;
      }
      receiveWebViewEvent('viewportChanged', {
        isStateStable: !!data.is_state_stable
      });
    }
    var height, stable_height;
    if (viewportHeight !== false) {
      height = (viewportHeight - mainButtonHeight) + 'px';
    } else {
      height = mainButtonHeight ? 'calc(100vh - ' + mainButtonHeight + 'px)' : '100vh';
    }
    if (viewportStableHeight !== false) {
      stable_height = (viewportStableHeight - mainButtonHeight) + 'px';
    } else {
      stable_height = mainButtonHeight ? 'calc(100vh - ' + mainButtonHeight + 'px)' : '100vh';
    }
    setCssProperty('viewport-height', height);
    setCssProperty('viewport-stable-height', stable_height);
  }


  function parseColorToHex(color) {
    color += '';
    var match;
    if (/^#([0-9a-f]){6}$/i.test(color)) {
      return color.toLowerCase();
    }
    else if (match = /^#([0-9a-f])([0-9a-f])([0-9a-f])$/i.exec(color)) {
      return ('#' + match[1] + match[1] + match[2] + match[2] + match[3] + match[3]).toLowerCase();
    }
    return false;
  }

  function isColorDark(rgb) {
    rgb = rgb.replace(/[\s#]/g, '');
    if (rgb.length == 3) {
      rgb = rgb[0] + rgb[0] + rgb[1] + rgb[1] + rgb[2] + rgb[2];
    }
    var r = parseInt(rgb.substr(0, 2), 16);
    var g = parseInt(rgb.substr(2, 2), 16);
    var b = parseInt(rgb.substr(4, 2), 16);
    var hsp = Math.sqrt(0.299 * (r * r) + 0.587 * (g * g) + 0.114 * (b * b));
    return hsp < 120;
  }

  function versionCompare(v1, v2) {
    if (typeof v1 !== 'string') v1 = '';
    if (typeof v2 !== 'string') v2 = '';
    v1 = v1.replace(/^\s+|\s+$/g, '').split('.');
    v2 = v2.replace(/^\s+|\s+$/g, '').split('.');
    var a = Math.max(v1.length, v2.length), i, p1, p2;
    for (i = 0; i < a; i++) {
      p1 = parseInt(v1[i]) || 0;
      p2 = parseInt(v2[i]) || 0;
      if (p1 == p2) continue;
      if (p1 > p2) return 1;
      return -1;
    }
    return 0;
  }

  function versionAtLeast(ver) {
    return versionCompare(webAppVersion, ver) >= 0;
  }

  function byteLength(str) {
    if (window.Blob) {
      try { return new Blob([str]).size; } catch (e) {}
    }
    var s = str.length;
    for (var i=str.length-1; i>=0; i--) {
      var code = str.charCodeAt(i);
      if (code > 0x7f && code <= 0x7ff) s++;
      else if (code > 0x7ff && code <= 0xffff) s+=2;
      if (code >= 0xdc00 && code <= 0xdfff) i--;
    }
    return s;
  }

  var windowOpen = window.open;
  window.open = function(url) {
    WebApp.openLink(url);
  };

  var BackButton = (function() {
    var isVisible = false;

    var backButton = {};
    Object.defineProperty(backButton, 'isVisible', {
      set: function(val){ setParams({is_visible: val}); },
      get: function(){ return isVisible; },
      enumerable: true
    });

    var curButtonState = null;

    WebView.onEvent('back_button_pressed', onBackButtonPressed);

    function onBackButtonPressed() {
      receiveWebViewEvent('backButtonClicked');
    }

    function buttonParams() {
      return {is_visible: isVisible};
    }

    function buttonState(btn_params) {
      if (typeof btn_params === 'undefined') {
        btn_params = buttonParams();
      }
      return JSON.stringify(btn_params);
    }

    function buttonCheckVersion() {
      if (!versionAtLeast('6.1')) {
        console.warn('[Telegram.WebApp] BackButton is not supported in version ' + webAppVersion);
      }
    }

    function updateButton() {
      var btn_params = buttonParams();
      var btn_state = buttonState(btn_params);
      if (curButtonState === btn_state) {
        return;
      }
      curButtonState = btn_state;
      WebView.postEvent('web_app_setup_back_button', false, btn_params);
    }

    function setParams(params) {
      if (typeof params.is_visible !== 'undefined') {
        isVisible = !!params.is_visible;
      }
      updateButton();
      return backButton;
    }

    backButton.onClick = function(callback) {
      buttonCheckVersion();
      onWebViewEvent('backButtonClicked', callback);
      return backButton;
    };
    backButton.offClick = function(callback) {
      buttonCheckVersion();
      offWebViewEvent('backButtonClicked', callback);
      return backButton;
    };
    backButton.show = function() {
      buttonCheckVersion();
      return setParams({is_visible: true});
    };
    backButton.hide = function() {
      buttonCheckVersion();
      return setParams({is_visible: false});
    };
    return backButton;
  })();

  var mainButtonHeight = 0;
  var MainButton = (function() {
    var isVisible = false;
    var isActive = true;
    var isProgressVisible = false;
    var buttonText = 'CONTINUE';
    var buttonColor = false;
    var buttonTextColor = false;

    var mainButton = {};
    Object.defineProperty(mainButton, 'text', {
      set: function(val){ mainButton.setParams({text: val}); },
      get: function(){ return buttonText; },
      enumerable: true
    });
    Object.defineProperty(mainButton, 'color', {
      set: function(val){ mainButton.setParams({color: val}); },
      get: function(){ return buttonColor || themeParams.button_color || '#2481cc'; },
      enumerable: true
    });
    Object.defineProperty(mainButton, 'textColor', {
      set: function(val){ mainButton.setParams({text_color: val}); },
      get: function(){ return buttonTextColor || themeParams.button_text_color || '#ffffff'; },
      enumerable: true
    });
    Object.defineProperty(mainButton, 'isVisible', {
      set: function(val){ mainButton.setParams({is_visible: val}); },
      get: function(){ return isVisible; },
      enumerable: true
    });
    Object.defineProperty(mainButton, 'isProgressVisible', {
      get: function(){ return isProgressVisible; },
      enumerable: true
    });
    Object.defineProperty(mainButton, 'isActive', {
      set: function(val){ mainButton.setParams({is_active: val}); },
      get: function(){ return isActive; },
      enumerable: true
    });

    var curButtonState = null;

    WebView.onEvent('main_button_pressed', onMainButtonPressed);

    var debugBtn = null, debugBtnStyle = {};
    if (initParams.tgWebAppDebug) {
      debugBtn = document.createElement('tg-main-button');
      debugBtnStyle = {
        font: '600 14px/18px sans-serif',
        display: 'none',
        width: '100%',
        height: '48px',
        borderRadius: '0',
        background: 'no-repeat right center',
        position: 'fixed',
        left: '0',
        right: '0',
        bottom: '0',
        margin: '0',
        padding: '15px 20px',
        textAlign: 'center',
        boxSizing: 'border-box',
        zIndex: '10000'
      };
      for (var k in debugBtnStyle) {
        debugBtn.style[k] = debugBtnStyle[k];
      }
      document.addEventListener('DOMContentLoaded', function onDomLoaded(event) {
        document.removeEventListener('DOMContentLoaded', onDomLoaded);
        document.body.appendChild(debugBtn);
        debugBtn.addEventListener('click', onMainButtonPressed, false);
      });
    }

    function onMainButtonPressed() {
      if (isActive) {
        receiveWebViewEvent('mainButtonClicked');
      }
    }

    function buttonParams() {
      var color = mainButton.color;
      var text_color = mainButton.textColor;
      return isVisible ? {
        is_visible: true,
        is_active: isActive,
        is_progress_visible: isProgressVisible,
        text: buttonText,
        color: color,
        text_color: text_color
      } : {is_visible: false};
    }

    function buttonState(btn_params) {
      if (typeof btn_params === 'undefined') {
        btn_params = buttonParams();
      }
      return JSON.stringify(btn_params);
    }

    function updateButton() {
      var btn_params = buttonParams();
      var btn_state = buttonState(btn_params);
      if (curButtonState === btn_state) {
        return;
      }
      curButtonState = btn_state;
      WebView.postEvent('web_app_setup_main_button', false, btn_params);
      if (initParams.tgWebAppDebug) {
        updateDebugButton(btn_params);
      }
    }

    function updateDebugButton(btn_params) {
      if (btn_params.is_visible) {
        debugBtn.style.display = 'block';
        mainButtonHeight = 48;

        debugBtn.style.opacity = btn_params.is_active ? '1' : '0.8';
        debugBtn.style.cursor = btn_params.is_active ? 'pointer' : 'auto';
        debugBtn.disabled = !btn_params.is_active;
        debugBtn.innerText = btn_params.text;
        debugBtn.style.backgroundImage = btn_params.is_progress_visible ? "url('data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20xmlns%3Axlink%3D%22http%3A%2F%2Fwww.w3.org%2F1999%2Fxlink%22%20viewport%3D%220%200%2048%2048%22%20width%3D%2248px%22%20height%3D%2248px%22%3E%3Ccircle%20cx%3D%2250%25%22%20cy%3D%2250%25%22%20stroke%3D%22%23fff%22%20stroke-width%3D%222.25%22%20stroke-linecap%3D%22round%22%20fill%3D%22none%22%20stroke-dashoffset%3D%22106%22%20r%3D%229%22%20stroke-dasharray%3D%2256.52%22%20rotate%3D%22-90%22%3E%3Canimate%20attributeName%3D%22stroke-dashoffset%22%20attributeType%3D%22XML%22%20dur%3D%22360s%22%20from%3D%220%22%20to%3D%2212500%22%20repeatCount%3D%22indefinite%22%3E%3C%2Fanimate%3E%3CanimateTransform%20attributeName%3D%22transform%22%20attributeType%3D%22XML%22%20type%3D%22rotate%22%20dur%3D%221s%22%20from%3D%22-90%2024%2024%22%20to%3D%22630%2024%2024%22%20repeatCount%3D%22indefinite%22%3E%3C%2FanimateTransform%3E%3C%2Fcircle%3E%3C%2Fsvg%3E')" : 'none';
        debugBtn.style.backgroundColor = btn_params.color;
        debugBtn.style.color = btn_params.text_color;
      } else {
        debugBtn.style.display = 'none';
        mainButtonHeight = 0;
      }
      if (document.documentElement) {
        document.documentElement.style.boxSizing = 'border-box';
        document.documentElement.style.paddingBottom = mainButtonHeight + 'px';
      }
      setViewportHeight();
    }

    function setParams(params) {
      if (typeof params.text !== 'undefined') {
        var text = params.text.toString().replace(/^\s+|\s+$/g, '');
        if (!text.length) {
          console.error('[Telegram.WebApp] Main button text is required', params.text);
          throw Error('WebAppMainButtonParamInvalid');
        }
        if (text.length > 64) {
          console.error('[Telegram.WebApp] Main button text is too long', text);
          throw Error('WebAppMainButtonParamInvalid');
        }
        buttonText = text;
      }
      if (typeof params.color !== 'undefined') {
        if (params.color === false ||
            params.color === null) {
          buttonColor = false;
        } else {
          var color = parseColorToHex(params.color);
          if (!color) {
            console.error('[Telegram.WebApp] Main button color format is invalid', color);
            throw Error('WebAppMainButtonParamInvalid');
          }
          buttonColor = color;
        }
      }
      if (typeof params.text_color !== 'undefined') {
        if (params.text_color === false ||
            params.text_color === null) {
          buttonTextColor = false;
        } else {
          var text_color = parseColorToHex(params.text_color);
          if (!text_color) {
            console.error('[Telegram.WebApp] Main button text color format is invalid', text_color);
            throw Error('WebAppMainButtonParamInvalid');
          }
          buttonTextColor = text_color;
        }
      }
      if (typeof params.is_visible !== 'undefined') {
        if (params.is_visible &&
            !mainButton.text.length) {
          console.error('[Telegram.WebApp] Main button text is required');
          throw Error('WebAppMainButtonParamInvalid');
        }
        isVisible = !!params.is_visible;
      }
      if (typeof params.is_active !== 'undefined') {
        isActive = !!params.is_active;
      }
      updateButton();
      return mainButton;
    }

    mainButton.setText = function(text) {
      return mainButton.setParams({text: text});
    };
    mainButton.onClick = function(callback) {
      onWebViewEvent('mainButtonClicked', callback);
      return mainButton;
    };
    mainButton.offClick = function(callback) {
      offWebViewEvent('mainButtonClicked', callback);
      return mainButton;
    };
    mainButton.show = function() {
      return mainButton.setParams({is_visible: true});
    };
    mainButton.hide = function() {
      return mainButton.setParams({is_visible: false});
    };
    mainButton.enable = function() {
      return mainButton.setParams({is_active: true});
    };
    mainButton.disable = function() {
      return mainButton.setParams({is_active: false});
    };
    mainButton.showProgress = function(leaveActive) {
      isActive = !!leaveActive;
      isProgressVisible = true;
      updateButton();
      return mainButton;
    };
    mainButton.hideProgress = function() {
      if (!mainButton.isActive) {
        isActive = true;
      }
      isProgressVisible = false;
      updateButton();
      return mainButton;
    }
    mainButton.setParams = setParams;
    return mainButton;
  })();

  var HapticFeedback = (function() {
    var hapticFeedback = {};

    function triggerFeedback(params) {
      if (params.type == 'impact') {
        if (params.impact_style != 'light' &&
            params.impact_style != 'medium' &&
            params.impact_style != 'heavy' &&
            params.impact_style != 'rigid' &&
            params.impact_style != 'soft') {
          console.error('[Telegram.WebApp] Haptic impact style is invalid', params.impact_style);
          throw Error('WebAppHapticImpactStyleInvalid');
        }
      } else if (params.type == 'notification') {
        if (params.notification_type != 'error' &&
            params.notification_type != 'success' &&
            params.notification_type != 'warning') {
          console.error('[Telegram.WebApp] Haptic notification type is invalid', params.notification_type);
          throw Error('WebAppHapticNotificationTypeInvalid');
        }
      } else if (params.type == 'selection_change') {
        // no params needed
      } else {
        console.error('[Telegram.WebApp] Haptic feedback type is invalid', params.type);
        throw Error('WebAppHapticFeedbackTypeInvalid');
      }
      if (!versionAtLeast('6.1')) {
        console.warn('[Telegram.WebApp] HapticFeedback is not supported in version ' + webAppVersion);
      }
      WebView.postEvent('web_app_trigger_haptic_feedback', false, params);
      return hapticFeedback;
    }

    hapticFeedback.impactOccupped = function(style) {
      return triggerFeedback({type: 'impact', impact_style: style});
    };
    hapticFeedback.notificationOccurred = function(type) {
      return triggerFeedback({type: 'notification', notification_type: type});
    };
    hapticFeedback.selectionChanged = function() {
      return triggerFeedback({type: 'selection_change'});
    };
    return hapticFeedback;
  })();

  var webAppInvoices = {};
  function onInvoiceClosed(eventType, eventData) {
    if (eventData.slug && webAppInvoices[eventData.slug]) {
      var invoiceData = webAppInvoices[eventData.slug];
      delete webAppInvoices[eventData.slug];
      if (invoiceData.callback) {
        invoiceData.callback(eventData.status);
      }
      receiveWebViewEvent('invoiceClosed', {
        url: invoiceData.url,
        status: eventData.status
      });
    }
  }

  if (!window.Telegram) {
    window.Telegram = {};
  }

  Object.defineProperty(WebApp, 'initData', {
    get: function(){ return webAppInitData; },
    enumerable: true
  });
  Object.defineProperty(WebApp, 'initDataUnsafe', {
    get: function(){ return webAppInitDataUnsafe; },
    enumerable: true
  });
  Object.defineProperty(WebApp, 'version', {
    get: function(){ return webAppVersion; },
    enumerable: true
  });
  Object.defineProperty(WebApp, 'colorScheme', {
    get: function(){ return colorScheme; },
    enumerable: true
  });
  Object.defineProperty(WebApp, 'themeParams', {
    get: function(){ return themeParams; },
    enumerable: true
  });
  Object.defineProperty(WebApp, 'isExpanded', {
    get: function(){ return isExpanded; },
    enumerable: true
  });
  Object.defineProperty(WebApp, 'viewportHeight', {
    get: function(){ return (viewportHeight === false ? window.innerHeight : viewportHeight) - mainButtonHeight; },
    enumerable: true
  });
  Object.defineProperty(WebApp, 'viewportStableHeight', {
    get: function(){ return (viewportStableHeight === false ? window.innerHeight : viewportStableHeight) - mainButtonHeight; },
    enumerable: true
  });
  Object.defineProperty(WebApp, 'BackButton', {
    value: BackButton,
    enumerable: true
  });
  Object.defineProperty(WebApp, 'MainButton', {
    value: MainButton,
    enumerable: true
  });
  Object.defineProperty(WebApp, 'HapticFeedback', {
    value: HapticFeedback,
    enumerable: true
  });
  WebApp.isVersionAtLeast = function(ver) {
    return versionAtLeast(ver);
  };
  WebApp.onEvent = function(eventType, callback) {
    onWebViewEvent(eventType, callback);
  };
  WebApp.offEvent = function(eventType, callback) {offWebViewEvent(eventType, callback);
  };
  WebApp.sendData = function (data) {
    if (!data || !data.length) {
      console.error('[Telegram.WebApp] Data is required', data);
      throw Error('WebAppDataInvalid');
    }
    if (byteLength(data) > 4096) {
      console.error('[Telegram.WebApp] Data is too long', data);
      throw Error('WebAppDataInvalid');
    }
    WebView.postEvent('web_app_data_send', false, {data: data});
  };
  WebApp.openLink = function (url) {
    var a = document.createElement('A');
    a.href = url;
    if (a.protocol != 'http:' &&
        a.protocol != 'https:') {
      console.error('[Telegram.WebApp] Url protocol is not supported', url);
      throw Error('WebAppTgUrlInvalid');
    }
    var url = a.href;
    if (versionAtLeast('6.1')) {
      WebView.postEvent('web_app_open_link', false, {url: url});
    } else {
      windowOpen(url, '_blank');
    }
  };
  WebApp.openTelegramLink = function (url) {
    var a = document.createElement('A');
    a.href = url;
    if (a.protocol != 'http:' &&
        a.protocol != 'https:') {
      console.error('[Telegram.WebApp] Url protocol is not supported', url);
      throw Error('WebAppTgUrlInvalid');
    }
    if (a.hostname != 't.me') {
      console.error('[Telegram.WebApp] Url host is not supported', url);
      throw Error('WebAppTgUrlInvalid');
    }
    var path_full = a.pathname + a.search;
    if (isIframe || versionAtLeast('6.1')) {
      WebView.postEvent('web_app_open_tg_link', false, {path_full: path_full});
    } else {
      location.href = 'https://t.me' + path_full;
    }
  };
  WebApp.openInvoice = function (url, callback) {
    var a = document.createElement('A'), match, slug;
    a.href = url;
    if (a.protocol != 'http:' &&
        a.protocol != 'https:' ||
        a.hostname != 't.me' ||
        !(match = a.pathname.match(/^\/(\$|invoice\/)([A-Za-z0-9\-_=]+)$/)) ||
        !(slug = match[2])) {
      console.error('[Telegram.WebApp] Invoice url is invalid', url);
      throw Error('WebAppInvoiceUrlInvalid');
    }
    if (!versionAtLeast('6.1')) {
      console.error('[Telegram.WebApp] Method openInvoice is not supported in version ' + webAppVersion);
      throw Error('WebAppMethodUnsupported');
    }
    if (webAppInvoices[slug]) {
      console.error('[Telegram.WebApp] Invoice is already opened');
      throw Error('WebAppInvoiceOpened');
    }
    webAppInvoices[slug] = {
      url: url,
      callback: callback
    };
    WebView.postEvent('web_app_open_invoice', false, {slug: slug});
  };
  WebApp.ready = function () {
    WebView.postEvent('web_app_ready');
  };
  WebApp.expand = function () {
    WebView.postEvent('web_app_expand');
  };
  WebApp.close = function () {
    WebView.postEvent('web_app_close');
  };

  window.Telegram.WebApp = WebApp;

  setViewportHeight();

  window.addEventListener('resize', onWindowResize);
  if (isIframe) {
    document.addEventListener('click', linkHandler);
  }

  WebView.onEvent('theme_changed', onThemeChanged);
  WebView.onEvent('viewport_changed', onViewportChanged);
  WebView.onEvent('invoice_closed', onInvoiceClosed);
  WebView.postEvent('web_app_request_theme');
  WebView.postEvent('web_app_request_viewport');

})();