From e2b711c6dbce4e518a5d8efd9a0e3a89ce3aa347 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marko=20Mili=C4=87?= <marko@tesobe.com>
Date: Fri, 17 Nov 2023 14:41:45 +0100
Subject: [PATCH] feature/Add user inactivity log off feature

---
 src/main/webapp/media/js/inactivity-timer.js  |  36 ++++++
 src/main/webapp/media/js/inactivity.js        | 105 ++++++++++++++++++
 src/main/webapp/templates-hidden/default.html |   5 +-
 3 files changed, 145 insertions(+), 1 deletion(-)
 create mode 100644 src/main/webapp/media/js/inactivity-timer.js
 create mode 100644 src/main/webapp/media/js/inactivity.js

diff --git a/src/main/webapp/media/js/inactivity-timer.js b/src/main/webapp/media/js/inactivity-timer.js
new file mode 100644
index 00000000..93b48826
--- /dev/null
+++ b/src/main/webapp/media/js/inactivity-timer.js
@@ -0,0 +1,36 @@
+function addSeconds(date, seconds) {
+  date.setSeconds(date.getSeconds() + seconds);
+  return date;
+}
+
+export function showCountdownTimer() {
+
+  // Get current date and time
+  var now = new Date().getTime();
+  let distance = countDownDate - now;
+
+  // Output the result in an element with id="countdown-timer-span"
+  let elementId = ("countdown-timer-span");
+  document.getElementById(elementId).innerHTML = "in " + Math.floor(distance / 1000) + "s";
+
+  // If the count down is over release resources
+  if (distance < 0) {
+    destroyCountdownTimer();
+  }
+}
+
+
+// Set the date we're counting down to
+let countDownDate = addSeconds(new Date(), 5);
+
+let showTimerInterval = null;
+
+export function destroyCountdownTimer() {
+    clearInterval(showTimerInterval);
+}
+
+export function resetCountdownTimer(seconds) {
+    destroyCountdownTimer(); // Destroy previous timer if any
+    countDownDate = addSeconds(new Date(), seconds); // Set the date we're counting down to
+    showTimerInterval = setInterval(showCountdownTimer, 1000); // Update the count down every 1 second
+}
\ No newline at end of file
diff --git a/src/main/webapp/media/js/inactivity.js b/src/main/webapp/media/js/inactivity.js
new file mode 100644
index 00000000..52249f45
--- /dev/null
+++ b/src/main/webapp/media/js/inactivity.js
@@ -0,0 +1,105 @@
+import * as countdownTimer from './inactivity-timer.js'
+
+// holds the idle duration in ms (current value = 301 seconds)
+var timeoutIntervalInMillis = 5 * 60 * 1000 + 1000;
+// holds the timeout variables for easy destruction and reconstruction of the setTimeout hooks
+var timeHook = null;
+
+function initializeTimeHook() {
+    // this method has the purpose of creating our timehooks and scheduling the call to our logout function when the idle time has been reached
+    if (timeHook == null) {
+        timeHook = setTimeout( function () { destroyTimeHook(); logout(); }.bind(this), timeoutIntervalInMillis);
+    }
+}
+
+function destroyTimeHook() {
+    // this method has the sole purpose of destroying any time hooks we might have created
+    clearTimeout(timeHook);
+    timeHook = null;
+}
+
+function resetTimeHook(event) {
+    // this method replaces the current time hook with a new time hook
+    destroyTimeHook();
+    initializeTimeHook();
+    countdownTimer.resetCountdownTimer(timeoutIntervalInMillis / 1000);
+    // show event type, element and coordinates of the click
+    // console.log(event.type + " at " + event.currentTarget);
+    // console.log("Coordinates: " + event.clientX + ":" + event.clientY);
+    console.log("Reset inactivity of a user");
+}
+
+function setupListeners() {
+    // here we setup the event listener for the mouse click operation
+    document.addEventListener("click", resetTimeHook);
+    document.addEventListener("mousemove", resetTimeHook);
+    document.addEventListener("mousedown", resetTimeHook);
+    document.addEventListener("keypress", resetTimeHook);
+    document.addEventListener("touchmove", resetTimeHook);
+    console.log("Listeners for user inactivity activated");
+}
+
+function destroyListeners() {
+    // here we destroy event listeners for the mouse click operation
+    document.removeEventListener("click", resetTimeHook);
+    document.removeEventListener("mousemove", resetTimeHook);
+    document.removeEventListener("mousedown", resetTimeHook);
+    document.removeEventListener("keypress", resetTimeHook);
+    document.removeEventListener("touchmove", resetTimeHook);
+    console.log("Listeners for user inactivity deactivated");
+}
+
+function logout() {
+    destroyListeners();
+    countdownTimer.destroyCountdownTimer();
+    console.log("Logging you out due to inactivity..");
+    const logoffButton = document.getElementById("logout");
+    logoffButton.click();
+}
+
+async function makeObpApiCall() {
+  let timeoutInSeconds;
+  try {
+    let obpApiHost = document.getElementById("api_home_link");
+    if(obpApiHost) {
+      obpApiHost = obpApiHost.href.split("?")[0];
+    }
+    console.log(obpApiHost);
+    const response = await fetch(`${obpApiHost}/obp/v5.1.0/ui/suggested-session-timeout`);
+    const json = await response.json();
+    if(json.timeout_in_seconds) {
+      timeoutInSeconds = json.timeout_in_seconds;
+      console.log(`Suggested value ${timeoutInSeconds} is used`);
+    } else {
+      timeoutInSeconds = 5 * 60 + 1; // Set default value to 301 seconds
+      console.log(`Default value ${timeoutInSeconds} is used`);
+    }
+  } catch (e) {
+    console.error(e);
+  }
+  return timeoutInSeconds;
+}
+
+async function getSuggestedSessionTimeout() {
+  if(!sessionStorage.getItem("suggested-session-timeout-in-seconds")) {
+    let timeoutInSeconds = await makeObpApiCall();
+    sessionStorage.setItem("suggested-session-timeout-in-seconds", timeoutInSeconds);
+  }
+  return sessionStorage.getItem("suggested-session-timeout-in-seconds") * 1000 + 1000; // We need timeout in millis
+}
+
+// self executing function to trigger the operation on page load
+(async function () {
+    timeoutIntervalInMillis = await getSuggestedSessionTimeout(); // Try to get suggested value
+    const logoffButton = document.getElementById("countdown-timer-span");
+    if(logoffButton) {
+        // to prevent any lingering timeout handlers preventing memory leaks
+        destroyTimeHook();
+        // setup a fresh time hook
+        initializeTimeHook();
+        // setup initial event listeners
+        setupListeners();
+        // Reset countdown timer
+        countdownTimer.resetCountdownTimer(timeoutIntervalInMillis / 1000);
+    }
+})();
\ No newline at end of file
diff --git a/src/main/webapp/templates-hidden/default.html b/src/main/webapp/templates-hidden/default.html
index 8503b9d4..ad392b09 100755
--- a/src/main/webapp/templates-hidden/default.html
+++ b/src/main/webapp/templates-hidden/default.html
@@ -53,6 +53,9 @@
     <script src="/media/js/scripts.js"></script>
     <script src="/media/js/select2.min.js"></script>
     <script src="/media/js/website.js"></script>
+
+    <!-- The script loads “in the background”, and then runs when the DOM is fully built. -->
+    <script type="module" defer src="/media/js/inactivity.js"></script>
 </head>
 
 
@@ -93,7 +96,7 @@
                     <div class="logged-in">
                         <span class="username"></span>
                         <a class="settings-imgs__link" id="logout" href="#">
-                            <span class="logout-link"><lift:loc locid="logoff">Log off</lift:loc></span>
+                            <span class="logout-link"><lift:loc locid="logoff">Log off <span id="countdown-timer-span" class="badge text-bg-primary"></span></lift:loc></span>
                         </a>
                     </div>
                 </div>