Add a way to restore broken spreadsheets

www/common/onlyoffice/inner.js

@@ -48,6 +48,7 @@ define([
     };
 
     var CHECKPOINT_INTERVAL = 50;
+    var DISPLAY_RESTORE_BUTTON = false;
 
     var debug = function (x) {
         if (!window.CP_DEV_MODE) { return; }
@@ -237,13 +238,7 @@ define([
             }
         };
 
-        var fmConfig = {
-            noHandlers: true,
-            noStore: true,
-            body: $('body'),
-            onUploaded: function (ev, data) {
-                if (!data || !data.url) { return; }
-                sframeChan.query('Q_OO_SAVE', data, function (err) {
+        var onUploaded = function (ev, data, err) {
             if (err) {
                 console.error(err);
                 return void UI.alert(Messages.oo_saveError);
@@ -270,6 +265,16 @@ define([
             }, function (err, obj) {
                 if (err || (obj && obj.error)) { console.error(err || obj.error); }
             });
+        };
+
+        var fmConfig = {
+            noHandlers: true,
+            noStore: true,
+            body: $('body'),
+            onUploaded: function (ev, data) {
+                if (!data || !data.url) { return; }
+                sframeChan.query('Q_OO_SAVE', data, function (err) {
+                    onUploaded(ev, data, err);
                 });
             }
         };
@@ -307,6 +312,19 @@ define([
                 }
             }, to);
         };
+        var restoreLastCp = function () {
+            content.saveLock = myOOId;
+            APP.onLocal();
+            APP.realtime.onSettle(function () {
+                onUploaded({
+                    hash: ooChannel.lastHash,
+                    index: ooChannel.cpIndex
+                }, {
+                    url: getLastCp().file,
+                });
+            });
+        };
+
 
         var openRtChannel = function (cb) {
             if (rtChannel.ready) { return void cb(); }
@@ -880,6 +898,16 @@ define([
                 });
                 $save.appendTo($rightside);
             }
+            if (window.CP_DEV_MODE || DISPLAY_RESTORE_BUTTON) {
+                common.createButton('', true, {
+                    name: 'restore',
+                    icon: 'fa-history',
+                    hiddenReadOnly: true
+                }).click(function () {
+                    if (initializing) { return void console.error('initializing'); }
+                    restoreLastCp();
+                }).attr('title', 'Restore last checkpoint').appendTo($rightside);
+            }
 
             var $export = common.createButton('export', true, {}, exportFile);
             $export.appendTo($rightside);