update

src/telegram-widget.js

+function(window) {
+  (function(window){
+    window.__parseFunction = function(__func, __attrs) {
+      __attrs = __attrs || [];
+      __func = '(function(' + __attrs.join(',') + '){' + __func + '})';
+      return window.execScript ? window.execScript(__func) : eval(__func);
+    }
+  }(window));
+  (function(window){
+
+  function addEvent(el, event, handler) {
+    var events = event.split(/\s+/);
+    for (var i = 0; i < events.length; i++) {
+      if (el.addEventListener) {
+        el.addEventListener(events[i], handler);
+      } else {
+        el.attachEvent('on' + events[i], handler);
+      }
+    }
+  }
+  function removeEvent(el, event, handler) {
+    var events = event.split(/\s+/);
+    for (var i = 0; i < events.length; i++) {
+      if (el.removeEventListener) {
+        el.removeEventListener(events[i], handler);
+      } else {
+        el.detachEvent('on' + events[i], handler);
+      }
+    }
+  }
+  function getCssProperty(el, prop) {
+    if (window.getComputedStyle) {
+      return window.getComputedStyle(el, '').getPropertyValue(prop) || null;
+    } else if (el.currentStyle) {
+      return el.currentStyle[prop] || null;
+    }
+    return null;
+  }
+  function geById(el_or_id) {
+    if (typeof el_or_id == 'string' || el_or_id instanceof String) {
+      return document.getElementById(el_or_id);
+    } else if (el_or_id instanceof HTMLElement) {
+      return el_or_id;
+    }
+    return null;
+  }
+
+  var getWidgetsOrigin = function(default_origin, dev_origin) {
+    var link = document.createElement('A'), origin;
+    link.href = document.currentScript && document.currentScript.src || default_origin;
+    origin = link.origin || link.protocol + '//' + link.hostname;
+    if (origin == 'https://telegram.org') {
+      origin = default_origin;
+    } else if (origin == 'https://telegram-js.azureedge.net' || origin == 'https://tg.dev') {
+      origin = dev_origin;
+    }
+    return origin;
+  };
+
+  var getPageCanonical = function() {
+    var a = document.createElement('A'), link, href;
+    if (document.querySelector) {
+      link = document.querySelector('link[rel="canonical"]');
+      if (link && (href = link.getAttribute('href'))) {
+        a.href = href;
+        return a.href;
+      }
+    } else {
+      var links = document.getElementsByTagName('LINK');
+      for (var i = 0; i < links.length; i++) {
+        if ((link = links[i]) &&
+            (link.getAttribute('rel') == 'canonical') &&
+            (href = link.getAttribute('href'))) {
+          a.href = href;
+          return a.href;
+        }
+      }
+    }
+    return false;
+  };
+
+  function getXHR() {
+    if (navigator.appName == "Microsoft Internet Explorer"){
+      return new ActiveXObject("Microsoft.XMLHTTP");
+    } else {
+      return new XMLHttpRequest();
+    }
+  }
+
+  function postMessageToIframe(iframe, event, data) {
+    try {
+      data = data || {};
+      data.event = event;
+      iframe.contentWindow.postMessage(JSON.stringify(data), '*');
+    } catch(e) {}
+  }
+
+  if (!window.__TgWidgetUuid) {
+    window.__TgWidgetUuid = 0;
+  }
+
+  function initWidget(widgetEl) {
+    var widgetId, widgetElId, widgetsOrigin, existsEl,
+        src, styles = {}, allowedAttrs = [],
+        defWidth, defHeight, scrollable = false, onInitAuthUser, onAuthUser, onUnauth;
+    if (!widgetEl.tagName ||
+        !(widgetEl.tagName.toUpperCase() == 'SCRIPT' ||
+          widgetEl.tagName.toUpperCase() == 'BLOCKQUOTE' &&
+          widgetEl.classList.contains('telegram-post'))) {
+      return null;
+    }
+    if (widgetEl._iframe) {
+      return widgetEl._iframe;
+    }
+    if (widgetId = widgetEl.getAttribute('data-telegram-post')) {
+      var comment = widgetEl.getAttribute('data-comment') || '';
+      widgetsOrigin = getWidgetsOrigin('https://t.me', 'https://post.tg.dev');
+      widgetElId = 'telegram-post-' + widgetId.replace(/[^a-z0-9_]/ig, '-') + (comment ? '-comment' + comment : '');
+      src = widgetsOrigin + '/' + widgetId + '?embed=1';
+      allowedAttrs = ['comment', 'userpic', 'single?', 'color', 'dark', 'dark_color'];
+      defWidth = widgetEl.getAttribute('data-width') || '100%';
+      defHeight = '';
+      styles.minWidth = '320px';
+    }
+    else if (widgetId = widgetEl.getAttribute('data-telegram-discussion')) {
+      widgetsOrigin = getWidgetsOrigin('https://t.me', 'https://post.tg.dev');
+      widgetElId = 'telegram-discussion-' + widgetId.replace(/[^a-z0-9_]/ig, '-') + '-' + (++window.__TgWidgetUuid);
+      var websitePageUrl = widgetEl.getAttribute('data-page-url');
+      if (!websitePageUrl) {
+        websitePageUrl = getPageCanonical();
+      }
+      src = widgetsOrigin + '/' + widgetId + '?embed=1&discussion=1' + (websitePageUrl ? '&page_url=' + encodeURIComponent(websitePageUrl) : '');
+      allowedAttrs = ['comments_limit', 'color', 'colorful', 'dark', 'dark_color', 'width', 'height'];
+      defWidth = widgetEl.getAttribute('data-width') || '100%';
+      defHeight = widgetEl.getAttribute('data-height') || 0;
+      styles.minWidth = '320px';
+      if (defHeight > 0) {
+        scrollable = true;
+      }
+    }
+    else if (widgetEl.hasAttribute('data-telegram-login')) {
+      widgetId = widgetEl.getAttribute('data-telegram-login');
+      widgetsOrigin = getWidgetsOrigin('https://oauth.telegram.org', 'https://oauth.tg.dev');
+      widgetElId = 'telegram-login-' + widgetId.replace(/[^a-z0-9_]/ig, '-');
+      src = widgetsOrigin + '/embed/' + widgetId + '?origin=' + encodeURIComponent(location.origin || location.protocol + '//' + location.hostname);
+      allowedAttrs = ['size', 'userpic', 'init_auth', 'request_access', 'radius', 'min_width', 'max_width', 'lang'];
+      defWidth = 186;
+      defHeight = 28;
+      if (widgetEl.hasAttribute('data-size')) {
+        var size = widgetEl.getAttribute('data-size');
+        if (size == 'small') defWidth = 148, defHeight = 20;
+        else if (size == 'large') defWidth = 238, defHeight = 40;
+      }
+      if (widgetEl.hasAttribute('data-onauth')) {
+        onInitAuthUser = onAuthUser = __parseFunction(widgetEl.getAttribute('data-onauth'), ['user']);
+      }
+      else if (widgetEl.hasAttribute('data-auth-url')) {
+        var a = document.createElement('A');
+        a.href = widgetEl.getAttribute('data-auth-url');
+        onAuthUser = function(user) {
+          var authUrl = a.href;
+          authUrl += (authUrl.indexOf('?') >= 0) ? '&' : '?';
+          var params = [];
+          for (var key in user) {
+            params.push(key + '=' + encodeURIComponent(user[key]));
+          }
+          authUrl += params.join('&');
+          location.href = authUrl;
+        };
+      }
+      if (widgetEl.hasAttribute('data-onunauth')) {
+        onUnauth = __parseFunction(widgetEl.getAttribute('data-onunauth'));
+      }
+    }
+    else if (widgetId = widgetEl.getAttribute('data-telegram-share-url')) {
+      widgetsOrigin = getWidgetsOrigin('https://t.me', 'https://post.tg.dev');
+      widgetElId = 'telegram-share-' + window.btoa(widgetId);
+      src = widgetsOrigin + '/share/embed?origin=' + encodeURIComponent(location.origin || location.protocol + '//' + location.hostname);
+      allowedAttrs = ['telegram-share-url', 'comment', 'size', 'text'];
+      defWidth = 60;
+      defHeight = 20;
+      if (widgetEl.getAttribute('data-size') == 'large') {
+        defWidth = 76;
+        defHeight = 28;
+      }
+    }
+    else {
+      return null;
+    }
+    existsEl = document.getElementById(widgetElId);
+    if (existsEl) {
+      return existsEl;
+    }
+    for (var i = 0; i < allowedAttrs.length; i++) {
+      var attr = allowedAttrs[i];
+      var novalue = attr.substr(-1) == '?';
+      if (novalue) {
+        attr = attr.slice(0, -1);
+      }
+      var data_attr = 'data-' + attr.replace(/_/g, '-');
+      if (widgetEl.hasAttribute(data_attr)) {
+        var attr_value = novalue ? '1' : encodeURIComponent(widgetEl.getAttribute(data_attr));
+        src += '&' + attr + '=' + attr_value;
+      }
+    }
+    function getCurCoords(iframe) {
+      var docEl = document.documentElement;
+      var frect = iframe.getBoundingClientRect();
+      return {
+        frameTop: frect.top,
+        frameBottom: frect.bottom,
+        frameLeft: frect.left,
+        frameRight: frect.right,
+        frameWidth: frect.width,
+        frameHeight: frect.height,
+        scrollTop: window.pageYOffset,
+        scrollLeft: window.pageXOffset,
+        clientWidth: docEl.clientWidth,
+        clientHeight: docEl.clientHeight
+      };
+    }
+    function visibilityHandler() {
+      if (isVisible(iframe, 50)) {
+        postMessageToIframe(iframe, 'visible', {frame: widgetElId});
+      }
+    }
+    function focusHandler() {
+      postMessageToIframe(iframe, 'focus', {has_focus: document.hasFocus()});
+    }
+    function postMessageHandler(event) {
+      if (event.source !== iframe.contentWindow ||
+          event.origin != widgetsOrigin) {
+        return;
+      }
+      try {
+        var data = JSON.parse(event.data);
+      } catch(e) {
+        var data = {};
+      }
+      if (data.event == 'resize') {
+        if (data.height) {
+          iframe.style.height = data.height + 'px';
+        }
+        if (data.width) {
+          iframe.style.width = data.width + 'px';
+        }
+      }
+      else if (data.event == 'ready') {
+        focusHandler();
+      }
+      else if (data.event == 'visible_off') {
+        removeEvent(window, 'scroll', visibilityHandler);
+        removeEvent(window, 'resize', visibilityHandler);
+      }
+      else if (data.event == 'get_coords') {
+        postMessageToIframe(iframe, 'callback', {
+          _cb: data._cb,
+          value: getCurCoords(iframe)
+        });
+      }
+      else if (data.event == 'scroll_to') {
+        try {
+          window.scrollTo(data.x || 0, data.y || 0);
+        } catch(e) {}
+      }
+      else if (data.event == 'auth_user') {
+        if (data.init) {
+          onInitAuthUser && onInitAuthUser(data.auth_data);
+        } else {
+          onAuthUser && onAuthUser(data.auth_data);
+        }
+      }
+      else if (data.event == 'unauthorized') {
+        onUnauth && onUnauth();
+      }
+    }
+    var iframe = document.createElement('iframe');
+    iframe.id = widgetElId;
+    iframe.src = src;
+    iframe.width = defWidth;
+    iframe.height = defHeight;
+    iframe.setAttribute('frameborder', '0');
+    if (!scrollable) {
+      iframe.setAttribute('scrolling', 'no');
+      iframe.style.overflow = 'hidden';
+    }
+    iframe.style.border = 'none';
+    for (var prop in styles) {
+      iframe.style[prop] = styles[prop];
+    }
+    if (widgetEl.parentNode) {
+      widgetEl.parentNode.insertBefore(iframe, widgetEl);
+      if (widgetEl.tagName.toUpperCase() == 'BLOCKQUOTE') {
+        widgetEl.parentNode.removeChild(widgetEl);
+      }
+    }
+    widgetEl._iframe = iframe;
+    addEvent(iframe, 'load', function() {
+      removeEvent(iframe, 'load', visibilityHandler);
+      addEvent(window, 'scroll', visibilityHandler);
+      addEvent(window, 'resize', visibilityHandler);
+      visibilityHandler();
+    });
+    addEvent(window, 'focus blur', focusHandler);
+    addEvent(window, 'message', postMessageHandler);
+    return iframe;
+  }
+  function isVisible(el, padding) {
+    var node = el, val;
+    var visibility = getCssProperty(node, 'visibility');
+    if (visibility == 'hidden') return false;
+    while (node) {
+      if (node === document.documentElement) break;
+      var display = getCssProperty(node, 'display');
+      if (display == 'none') return false;
+      var opacity = getCssProperty(node, 'opacity');
+      if (opacity !== null && opacity < 0.1) return false;
+      node = node.parentNode;
+    }
+    if (el.getBoundingClientRect) {
+      padding = +padding || 0;
+      var rect = el.getBoundingClientRect();
+      var html = document.documentElement;
+      if (rect.bottom < padding ||
+          rect.right < padding ||
+          rect.top > (window.innerHeight || html.clientHeight) - padding ||
+          rect.left > (window.innerWidth || html.clientWidth) - padding) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  function getAllWidgets() {
+    var widgets = [];
+    if (document.querySelectorAll) {
+      widgets = document.querySelectorAll('script[data-telegram-post],blockquote.telegram-post,script[data-telegram-discussion],script[data-telegram-login],script[data-telegram-share-url]');
+    } else {
+      widgets = Array.prototype.slice.apply(document.getElementsByTagName('SCRIPT'));
+      widgets = widgets.concat(Array.prototype.slice.apply(document.getElementsByTagName('BLOCKQUOTE')));
+    }
+    return widgets;
+  }
+
+  function setWidgetOptions(options, el_or_id) {
+    var iframe;
+    if (typeof el_or_id === 'undefined') {
+      var widgets = getAllWidgets();
+      for (var i = 0; i < widgets.length; i++) {
+        if (iframe = widgets[i]._iframe) {
+          postMessageToIframe(iframe, 'set_options', {options: options});
+        }
+      }
+    } else {
+      if (iframe = geById(el_or_id)) {
+        if (iframe.tagName &&
+            iframe.tagName.toUpperCase() == 'IFRAME') {
+          postMessageToIframe(iframe, 'set_options', {options: options});
+        } else if (iframe._iframe) {
+          iframe = iframe._iframe;
+          postMessageToIframe(iframe, 'set_options', {options: options});
+        }
+      }
+    }
+  }
+
+  if (!document.currentScript ||
+      !initWidget(document.currentScript)) {
+    var widgets = getAllWidgets();
+    for (var i = 0; i < widgets.length; i++) {
+      initWidget(widgets[i]);
+    }
+  }
+
+  var TelegramLogin = {
+    popups: {},
+    auth: function(options, callback) {
+      var bot_id = parseInt(options.bot_id);
+      if (!bot_id) {
+        throw new Error('Bot id required');
+      }
+      var width = 550;
+      var height = 470;
+      var left = Math.max(0, (screen.width - width) / 2) + (screen.availLeft | 0),
+          top = Math.max(0, (screen.height - height) / 2) + (screen.availTop | 0);
+      var onMessage = function (event) {
+        try {
+          var data = JSON.parse(event.data);
+        } catch(e) {
+          var data = {};
+        }
+        if (!TelegramLogin.popups[bot_id]) return;
+        if (event.source !== TelegramLogin.popups[bot_id].window) return;
+        if (data.event == 'auth_result') {
+          onAuthDone(data.result);
+        }
+      };
+      var onAuthDone = function (authData) {
+        if (!TelegramLogin.popups[bot_id]) return;
+        if (TelegramLogin.popups[bot_id].authFinished) return;
+        callback && callback(authData);
+        TelegramLogin.popups[bot_id].authFinished = true;
+        removeEvent(window, 'message', onMessage);
+      };
+      var checkClose = function(bot_id) {
+        if (!TelegramLogin.popups[bot_id]) return;
+        if (!TelegramLogin.popups[bot_id].window ||
+            TelegramLogin.popups[bot_id].window.closed) {
+          return TelegramLogin.getAuthData(options, function(origin, authData) {
+            onAuthDone(authData);
+          });
+        }
+        setTimeout(checkClose, 100, bot_id);
+      }
+      var popup_url = Telegram.Login.widgetsOrigin + '/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) : '');
+      var popup = window.open(popup_url, 'telegram_oauth_bot' + bot_id, 'width=' + width + ',height=' + height + ',left=' + left + ',top=' + top + ',status=0,location=0,menubar=0,toolbar=0');
+      TelegramLogin.popups[bot_id] = {
+        window: popup,
+        authFinished: false
+      };
+      if (popup) {
+        addEvent(window, 'message', onMessage);
+        popup.focus();
+        checkClose(bot_id);
+      }
+    },
+    getAuthData: function(options, callback) {
+      var bot_id = parseInt(options.bot_id);
+      if (!bot_id) {
+        throw new Error('Bot id required');
+      }
+      var xhr = getXHR();
+      var url = Telegram.Login.widgetsOrigin + '/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 = function() {
+        if (xhr.readyState == 4) {
+          if (typeof xhr.responseBody == 'undefined' && xhr.responseText) {
+            try {
+              var result = JSON.parse(xhr.responseText);
+            } catch(e) {
+              var result = {};
+            }
+            if (result.user) {
+              callback(result.origin, result.user);
+            } else {
+              callback(result.origin, false);
+            }
+          } else {
+            callback('*', false);
+          }
+        }
+      };
+      xhr.onerror = function() {
+        callback('*', false);
+      };
+      xhr.withCredentials = true;
+      xhr.send('bot_id=' + encodeURIComponent(options.bot_id) + (options.lang ? '&lang=' + encodeURIComponent(options.lang) : ''));
+    }
+  };
+
+  if (!window.Telegram) {
+    window.Telegram = {};
+  }
+  window.Telegram.setWidgetOptions = setWidgetOptions;
+  window.Telegram.Login = {
+    auth: TelegramLogin.auth,
+    widgetsOrigin: getWidgetsOrigin('https://oauth.telegram.org', 'https://oauth.tg.dev')
+  };
+
+  }(window));
+}