Add support of allow free url config option with correspond modifications

lib/response.js

@@ -112,7 +112,8 @@ function newNote(req, res, next) {
         return response.errorForbidden(res);
     }
     models.Note.create({
-        ownerId: owner
+        ownerId: owner,
+        alias: req.alias ? req.alias : null
     }).then(function (note) {
         return res.redirect(config.serverurl + "/" + LZString.compressToBase64(note.id));
     }).catch(function (err) {
@@ -133,6 +134,7 @@ function checkViewPermission(req, note) {
 }
 
 function findNote(req, res, callback, include) {
+    var noteId = req.params.noteId;
     var id = req.params.noteId || req.params.shortid;
     models.Note.parseNoteId(id, function (err, _id) {
         models.Note.findOne({
@@ -142,7 +144,12 @@ function findNote(req, res, callback, include) {
             include: include || null
         }).then(function (note) {
             if (!note) {
-                return response.errorNotFound(res);
+                if (config.allowfreeurl && noteId) {
+                    req.alias = noteId;
+                    return newNote(req, res);
+                } else {
+                    return response.errorNotFound(res);
+                }
             }
             if (!checkViewPermission(req, note)) {
                 return response.errorForbidden(res);