Ability to force the version of onlyoffice

www/common/onlyoffice/inner.js

@@ -81,7 +81,7 @@ define([
             hashes: {},
             ids: {},
             mediasSources: {},
-            version: NEW_VERSION
+            version: privateData.ooForceVersion ? Number(privateData.ooForceVersion) : NEW_VERSION
         };
         var oldHashes = {};
         var oldIds = {};
@@ -1437,7 +1437,11 @@ define([
 
             var version = '';
             // Old version detected: use the old OO and start the migration if we can
-            if (content && !content.version) {
+            if (privateData.ooForceVersion) {
+                if (privateData.ooForceVersion === "1") {
+                    version = "v1/";
+                }
+            } else if (content && (!content.version || content.version === 1)) {
                 version = 'v1/';
                 APP.migrate = true;
                 // Registedred users can start the migration

www/common/onlyoffice/main.js

@@ -38,6 +38,7 @@ define([
     }).nThen(function (/*waitFor*/) {
         var addData = function (obj) {
             obj.ooType = window.location.pathname.replace(/^\//, '').replace(/\/$/, '');
+            obj.ooForceVersion = localStorage.CryptPad_ooVersion || sessionStorage.CryptPad_ooVersion || "";
         };
         var addRpc = function (sframeChan, Cryptpad, Utils) {
             sframeChan.on('Q_OO_SAVE', function (data, cb) {