Sessions directory path configuration

This patch allows to configure the directory where the sessions file will be
stored. Updates server documentation

Signed-off-by: Bruno Bottazzini <bruno.bottazzini@intel.com>

README.md

@@ -119,6 +119,12 @@ The configuration file has the following attributes:
           Choose where to store tmp files.
           Default: /tmp
 
+    sessions_dir:
+          Choose where to store sessions files.
+          Default: ./sessions
+          If the folder does not exists, it will be created.
+          Where ./ means root of the server folder.
+
     journal_access:
           Allows users to access the journal tab.
           Default: true

server/app.js

@@ -44,6 +44,7 @@
 
     try {
         var app = express();
+        var jConf = getConfigurationJson();
 
         app.use(session({
             genid: function(req) {
@@ -57,10 +58,10 @@
             resave: true,
             saveUninitialized: true,
             store: new SessionStore({
-                retries: 500
+                retries: 500,
+                path: jConf.sessions_dir
             })
         }));
-        var jConf = getConfigurationJson();
 
         // view engine setup
         app.set('views', path.join(__dirname, 'views'));

server/configuration.json

@@ -2,6 +2,7 @@
     "server_port": 3000,
     "server_output": true,
     "server_user_home_dir": "/tmp",
+    "sessions_dir" : "./sessions",
     "journal_access": true,
     "cheat_sheet_access": true,
     "run_fbp_access": true,