[feature] Create option to automatically reconnect after a few seconds

On some erros that display a modal with "Force reconnect" button, allow
Etherpad to automatically reload pad after a few seconds. Amount of
seconds is defined on settings.json.

Still need to create tests for this feature, and implement i18n.

src/node/handler/PadMessageHandler.js

@@ -936,7 +936,7 @@ function handleSwitchToPad(client, message)
   var currentSession = sessioninfos[client.id];
   var padId = currentSession.padId;
   var roomClients = _getRoomClients(padId);
-  
+
   async.forEach(roomClients, function(client, callback) {
     var sinfo = sessioninfos[client.id];
     if(sinfo && sinfo.author == currentSession.author) {
@@ -1115,7 +1115,7 @@ function handleClientReady(client, message)
 
       //Check if this author is already on the pad, if yes, kick the other sessions!
       var roomClients = _getRoomClients(pad.id);
-      
+
       async.forEach(roomClients, function(client, callback) {
         var sinfo = sessioninfos[client.id];
         if(sinfo && sinfo.author == author) {
@@ -1176,6 +1176,7 @@ function handleClientReady(client, message)
           "accountPrivs": {
               "maxRevisions": 100
           },
+          "automaticReconnectionTimeout": settings.automaticReconnectionTimeout,
           "initialRevisionList": [],
           "initialOptions": {
               "guestPolicy": "deny"
@@ -1676,13 +1677,13 @@ function composePadChangesets(padId, startNum, endNum, callback)
 
 function _getRoomClients(padID) {
   var roomClients = []; var room = socketio.sockets.adapter.rooms[padID];
-  
+
   if (room) {
     for (var id in room.sockets) {
       roomClients.push(socketio.sockets.sockets[id]);
     }
   }
-  
+
   return roomClients;
 }
 

src/node/utils/Settings.js

@@ -177,6 +177,11 @@ exports.loglevel = "INFO";
  */
 exports.disableIPlogging = false;
 
+/**
+ * Number of seconds to automatically reconnect pad
+ */
+exports.automaticReconnectionTimeout = 0;
+
 /**
  * Disable Load Testing
  */