feat(iframe_api): Implement readyToClose event and hangup command

modules/API/API.js

@@ -50,7 +50,8 @@ function initCommands() {
         "toggle-film-strip": APP.UI.toggleFilmStrip,
         "toggle-chat": APP.UI.toggleChat,
         "toggle-contact-list": APP.UI.toggleContactList,
-        "toggle-share-screen": APP.conference.toggleScreenSharing
+        "toggle-share-screen": APP.conference.toggleScreenSharing,
+        "video-hangup": () => APP.conference.hangup()
     };
     Object.keys(commands).forEach(function (key) {
         postis.listen(key, commands[key]);
@@ -78,7 +79,8 @@ const events = {
     "participant-joined": false,
     "participant-left": false,
     "video-conference-joined": false,
-    "video-conference-left": false
+    "video-conference-left": false,
+    "video-ready-to-close": false
 };
 
 /**
@@ -243,6 +245,14 @@ export default {
         triggerEvent("video-conference-left", {roomName: room});
     },
 
+    /**
+     * Notify external application (if API is enabled) that
+     * we are ready to be closed.
+     */
+    notifyReadyToClose () {
+        triggerEvent("video-ready-to-close", {});
+    },
+
     /**
      * Removes the listeners.
      */

modules/API/external/external_api.js

@@ -33,7 +33,8 @@ var commands = {
     "toggleFilmStrip": "toggle-film-strip",
     "toggleChat": "toggle-chat",
     "toggleContactList": "toggle-contact-list",
-    "toggleShareScreen": "toggle-share-screen"
+    "toggleShareScreen": "toggle-share-screen",
+    "hangup": "video-hangup"
 };
 
 /**
@@ -47,7 +48,8 @@ var events = {
     "participantJoined": "participant-joined",
     "participantLeft": "participant-left",
     "videoConferenceJoined": "video-conference-joined",
-    "videoConferenceLeft": "video-conference-left"
+    "videoConferenceLeft": "video-conference-left",
+    "readyToClose": "video-ready-to-close"
 };
 
 /**
@@ -246,6 +248,8 @@ JitsiMeetExternalAPI.prototype.executeCommands = function(object) {
  * {{
  * roomName: room //the room name of the conference
  * }}
+ * readyToClose - all hangup operations are completed and Jitsi Meet is ready
+ * to be disposed.
  * @param object
  */
 JitsiMeetExternalAPI.prototype.addEventListeners = function(object) {