closes #4868

public/language/en_GB/login.json

@@ -7,5 +7,6 @@
 	"alternative_logins": "Alternative Logins",
 	"failed_login_attempt": "Login Unsuccessful",
 	"login_successful": "You have successfully logged in!",
-	"dont_have_account": "Don't have an account?"
+	"dont_have_account": "Don't have an account?",
+	"logged-out-due-to-inactivity": "You have been logged out due to inactivity"
 }

public/src/admin/admin.js

@@ -2,9 +2,23 @@
 /*global config, translator, componentHandler, define, socket, app, ajaxify, utils, bootbox, Slideout, NProgress, RELATIVE_PATH*/
 
 (function() {
+	var logoutTimer = 0;
+	function startLogoutTimer() {
+		if (logoutTimer) {
+			clearTimeout(logoutTimer);
+		}
+
+		logoutTimer = setTimeout(function() {
+			app.alert({
+				message: '[[login:logged-out-due-to-inactivity]]'
+			});
+			setTimeout(app.logout, 5000);
+		}, 3600000);
+	}
 
 	$(window).on('action:ajaxify.end', function() {
 		showCorrectNavTab();
+		startLogoutTimer();
 	});
 
 	function showCorrectNavTab() {

src/middleware/middleware.js

@@ -206,6 +206,7 @@ middleware.isAdmin = function(req, res, next) {
 
 				var loginTime = req.session.meta ? req.session.meta.datetime : 0;
 				if (loginTime && parseInt(loginTime, 10) > Date.now() - 3600000) {
+					req.session.meta.datetime += 300000;
 					return next();
 				}