Session idle timeout with logout implementation

src/app/home/timeout-dialog/idle-timeout.service.ts

@@ -0,0 +1,29 @@
+import { Injectable } from '@angular/core';
+import { environment } from 'environments/environment';
+import { interval, merge, fromEvent, Observable} from 'rxjs';
+import { takeUntil, repeat, map} from 'rxjs/operators';
+
+/**
+ *  Idle timeout service used to track idle user
+ */
+@Injectable({
+    providedIn: 'root'
+})
+export class IdleTimeoutService {
+
+    // max timeout for an idle user
+    readonly timeoutDelay = environment.session.timeout.idleTimeout || 300000; // 5 minutes
+
+    // observable timeout
+    readonly $onSessionTimeout: Observable<void>;
+
+    constructor() {
+        const events = ['mousemove', 'keydown', 'wheel', 'mousedown', 'scroll'];
+        const $signal = merge(...events.map(eventName => fromEvent(document, eventName)));
+        this.$onSessionTimeout = interval(this.timeoutDelay).pipe(
+            takeUntil($signal),
+            map(() => undefined),
+            repeat()
+        );
+    }
+}