From 9e7f8b85dd12de07986f44ac3d874bd035d86ef6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Julius=20H=C3=A4rtl?= <jus@bitgrid.net>
Date: Fri, 3 Apr 2020 22:43:21 +0200
Subject: [PATCH] Add config for auto logout after browser inactivity
MIME-Version: 1.0
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Content-Transfer-Encoding: 8bit

Signed-off-by: Julius Härtl <jus@bitgrid.net>
---
 config/config.sample.php      |  9 +++++++
 core/src/session-heartbeat.js | 50 ++++++++++++++++++++++++++++++-----
 2 files changed, 53 insertions(+), 6 deletions(-)

diff --git a/config/config.sample.php b/config/config.sample.php
index 00e3a6779f..268838a176 100644
--- a/config/config.sample.php
+++ b/config/config.sample.php
@@ -251,6 +251,15 @@ $CONFIG = [
  */
 'session_keepalive' => true,
 
+/**
+ * Enable or disable the automatic logout after session_lifetime, even if session
+ * keepalive is enabled. This will make sure that an inactive browser will be logged out
+ * even if requests to the server might extend the session lifetime.
+ *
+ * Defaults to ``false``
+ */
+'auto_logout' => false,
+
 /**
  * Enforce token authentication for clients, which blocks requests using the user
  * password for enhanced security. Users need to generate tokens in personal settings
diff --git a/core/src/session-heartbeat.js b/core/src/session-heartbeat.js
index a941720d85..4678982d59 100644
--- a/core/src/session-heartbeat.js
+++ b/core/src/session-heartbeat.js
@@ -21,18 +21,21 @@
 
 import $ from 'jquery'
 import { emit } from '@nextcloud/event-bus'
+import { loadState } from '@nextcloud/initial-state'
+import { getCurrentUser } from '@nextcloud/auth'
 
 import { generateUrl } from './OC/routing'
-import OC from './OC'
-import { setToken as setRequestToken } from './OC/requesttoken'
+import { setToken as setRequestToken, getToken as getRequestToken } from './OC/requesttoken'
+
+const config = loadState('core', 'config')
 
 /**
  * session heartbeat (defaults to enabled)
  * @returns {boolean}
  */
 const keepSessionAlive = () => {
-	return OC.config.session_keepalive === undefined
-		|| !!OC.config.session_keepalive
+	return config.session_keepalive === undefined
+		|| !!config.session_keepalive
 }
 
 /**
@@ -41,8 +44,8 @@ const keepSessionAlive = () => {
  */
 const getInterval = () => {
 	let interval = NaN
-	if (OC.config.session_lifetime) {
-		interval = Math.floor(OC.config.session_lifetime / 2)
+	if (config.session_lifetime) {
+		interval = Math.floor(config.session_lifetime / 2)
 	}
 
 	// minimum one minute, max 24 hours, default 15 minutes
@@ -83,11 +86,46 @@ const startPolling = () => {
 	return interval
 }
 
+const registerAutoLogout = () => {
+	if (!config.auto_logout || !getCurrentUser()) {
+		return
+	}
+
+	let lastActive = Date.now()
+	window.addEventListener('mousemove', e => {
+		lastActive = Date.now()
+		localStorage.setItem('lastActive', lastActive)
+	})
+
+	window.addEventListener('touchstart', e => {
+		lastActive = Date.now()
+		localStorage.setItem('lastActive', lastActive)
+	})
+
+	window.addEventListener('storage', e => {
+		if (e.key !== 'lastActive') {
+			return
+		}
+		lastActive = e.newValue
+	})
+
+	setInterval(function() {
+		const timeout = Date.now() - config.session_lifetime * 1000
+		if (lastActive < timeout) {
+			console.info('Inactivity timout reached, logging out')
+			const logoutUrl = generateUrl('/logout') + '?requesttoken=' + getRequestToken()
+			window.location = logoutUrl
+		}
+	}, 1000)
+}
+
 /**
  * Calls the server periodically to ensure that session and CSRF
  * token doesn't expire
  */
 export const initSessionHeartBeat = () => {
+	registerAutoLogout()
+
 	if (!keepSessionAlive()) {
 		console.info('session heartbeat disabled')
 		return