mattermost#1187 base proposal to sync user status to host OS

src/main/UserActivityMonitor.ts

@@ -73,13 +73,27 @@ export class UserActivityMonitor extends EventEmitter {
                 log.error('Error getting system idle time:', err);
             }
         }, this.config.updateFrequencyMs) as unknown as number;
+
+        // Register powerMonitor listeners to synchornise user status to host OS events
+        log.debug('Registering powerMonitor listeners');
+        if (process.platform === 'win32' || process.platform === 'darwin') {
+            powerMonitor.addListener('lock-screen', this.listenerLockScreen);
+            powerMonitor.addListener('unlock-screen', this.listenerUnlockScreen);
+        }
     }
 
     /**
    * Stop monitoring system events and idle time
    */
     stopMonitoring() {
         clearInterval(this.systemIdleTimeIntervalID);
+
+        // Unregister powerMonitor listeners to synchornise user status to host OS events
+        log.debug('Unregistering powerMonitor listeners');
+        if (process.platform === 'win32' || process.platform === 'darwin') {
+            powerMonitor.removeListener('lock-screen', this.listenerLockScreen);
+            powerMonitor.removeListener('unlock-screen', this.listenerUnlockScreen);
+        }
     }
 
     /**
@@ -135,6 +149,26 @@ export class UserActivityMonitor extends EventEmitter {
             isSystemEvent,
         });
     }
+
+    protected listenerLockScreen() {
+        /**
+         * TODO:
+         * find a way to respect custom set user statuses, for example,
+         * don't do anything if the user has their status set to DnD.
+         */
+        log.info('host OS screen has been locked');
+        userActivityMonitor.setActivityState(false, true);
+    }
+
+    protected listenerUnlockScreen() {
+        /**
+         * TODO:
+         * find a way to respect custom set user statuses, for example,
+         * don't do anything if the user has their status set to DnD.
+         */
+        log.info('host OS screen has been unlocked');
+        userActivityMonitor.setActivityState(true, true);
+    }
 }
 
 const userActivityMonitor = new UserActivityMonitor();