Fix the history mode with readOnly and old URLs

www/common/common-history.js

@@ -37,6 +37,17 @@ define([
 
         var parsed = config.href ? common.parsePadUrl(config.href) : {};
         var secret = common.getSecrets(parsed.type, parsed.hash);
+
+        History.readOnly = 1;
+        if (!secret.keys) {
+            secret.keys = secret.key;
+            History.readOnly = 2;
+        }
+        else if (!secret.keys.validateKey) {
+            secret.keys.validateKey = true;
+            History.readOnly = 0;
+        }
+
         var crypto = Crypto.createEncryptor(secret.keys);
 
         var to = window.setTimeout(function () {
@@ -185,6 +196,7 @@ define([
                 'class':'revertHistory buttonSuccess',
                 title: Messages.history_restoreTitle
             }).text(Messages.history_restore).appendTo($nav);
+            if (!History.readOnly) { $rev.hide(); }
 
             onUpdate = function () {
                 $cur.attr('max', states.length);