implement extension point for share menu

www/common/common-ui-elements.js

@@ -859,9 +859,14 @@ define([
         if (typeof config !== "object" || !Array.isArray(config.options)) { return; }
         if (config.feedback && !config.common) { return void console.error("feedback in a dropdown requires sframe-common"); }
 
+        var isElement = function (o) {
+            return /HTML/.test(Object.prototype.toString.call(o)) &&
+                typeof(o.tagName) === 'string';
+        };
         var allowedTags = ['a', 'p', 'hr'];
         var isValidOption = function (o) {
             if (typeof o !== "object") { return false; }
+            if (isElement(o)) { return true; }
             if (!o.tag || allowedTags.indexOf(o.tag) === -1) { return false; }
             return true;
         };
@@ -893,6 +898,7 @@ define([
 
         config.options.forEach(function (o) {
             if (!isValidOption(o)) { return; }
+            if (isElement(o)) { return $innerblock.append($(o)); }
             $('<' + o.tag + '>', o.attributes || {}).html(o.content || '').appendTo($innerblock);
         });
 

www/common/toolbar3.js

@@ -8,7 +8,8 @@ define([
     '/common/common-feedback.js',
     '/customize/messages.js',
     '/common/clipboard.js',
-], function ($, Config, ApiConfig, UIElements, UI, Hash, Feedback, Messages, Clipboard) {
+    '/common/hyperscript.js',
+], function ($, Config, ApiConfig, UIElements, UI, Hash, Feedback, Messages, Clipboard, h) {
     var Common;
 
     var Bar = {
@@ -496,6 +497,9 @@ define([
                 content: '<span class="fa fa-eye"></span> ' + Messages.getEmbedCode
             });
         }
+        if (typeof(Config.customizeShareOptions) === 'function') {
+            Config.customizeShareOptions(hashes, options);
+        }
         var dropdownConfigShare = {
             text: $('<div>').append($shareIcon).html(),
             options: options,