Add support of allow anonymous config option with correspond modifications

lib/config.js

@@ -19,6 +19,8 @@ var urladdport = process.env.HMD_URL_ADDPORT ? (process.env.HMD_URL_ADDPORT ===
 
 var usecdn = process.env.HMD_USECDN ? (process.env.HMD_USECDN === 'true') : ((typeof config.usecdn === 'boolean') ? config.usecdn : true);
 
+var allowanonmyous = process.env.HMD_ALLOW_ANONMYOUS ?  (process.env.HMD_ALLOW_ANONMYOUS === 'true') : ((typeof config.allowanonmyous === 'boolean') ? config.allowanonmyous : true);
+
 // db
 var db = config.db || {
     dialect: 'sqlite',
@@ -125,6 +127,7 @@ module.exports = {
     usessl: usessl,
     serverurl: getserverurl(),
     usecdn: usecdn,
+    allowanonmyous: allowanonmyous,
     db: db,
     sslkeypath: path.join(cwd, sslkeypath),
     sslcertpath: path.join(cwd, sslcertpath),

lib/realtime.js

@@ -763,6 +763,7 @@ function connection(socket) {
             var note = notes[noteId];
             //Only owner can change permission
             if (note.owner && note.owner == socket.request.user.id) {
+                if (permission == 'freely' && !config.allowanonmyous) return;
                 note.permission = permission;
                 models.Note.update({
                     permission: permission

lib/response.js

@@ -60,6 +60,7 @@ function showIndex(req, res, next) {
     res.render(config.indexpath, {
         url: config.serverurl,
         useCDN: config.usecdn,
+        allowAnonmyous: config.allowanonmyous,
         facebook: config.facebook,
         twitter: config.twitter,
         github: config.github,
@@ -92,6 +93,7 @@ function responseHackMD(res, note) {
         url: config.serverurl,
         title: title,
         useCDN: config.usecdn,
+        allowAnonmyous: config.allowanonmyous,
         facebook: config.facebook,
         twitter: config.twitter,
         github: config.github,
@@ -106,6 +108,8 @@ function newNote(req, res, next) {
     var owner = null;
     if (req.isAuthenticated()) {
         owner = req.user.id;
+    } else if (!config.allowanonmyous) {
+        return response.errorForbidden(res);
     }
     models.Note.create({
         ownerId: owner