From 9ae499f18c331276fa8f8768589e8a631bcd4c00 Mon Sep 17 00:00:00 2001
From: Anton Vakhrushev <anwinged@ya.ru>
Date: Sun, 18 Oct 2020 10:47:09 +0300
Subject: [PATCH] Add notification permission request

---
 src/Helpers/Browser.ts | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/src/Helpers/Browser.ts b/src/Helpers/Browser.ts
index 5b44d5a..f437489 100644
--- a/src/Helpers/Browser.ts
+++ b/src/Helpers/Browser.ts
@@ -9,8 +9,28 @@ export function parseLocation(location?: string | undefined) {
 }
 
 export function notify(msg: string): void {
-    const n = new Notification(msg);
-    setTimeout(() => n && n.close(), 4000);
+    // Let's check if the browser supports notifications
+    if (!('Notification' in window)) {
+        alert('This browser does not support desktop notification');
+    }
+
+    // Let's check whether notification permissions have already been granted
+    else if (Notification.permission === 'granted') {
+        // If it's okay let's create a notification
+        const n = new Notification(msg);
+        setTimeout(() => n && n.close(), 4000);
+    }
+
+    // Otherwise, we need to ask the user for permission
+    else if (Notification.permission !== 'denied') {
+        Notification.requestPermission().then(function (permission) {
+            // If the user accepts, let's create a notification
+            if (permission === 'granted') {
+                const n = new Notification(msg);
+                setTimeout(() => n && n.close(), 4000);
+            }
+        });
+    }
 }
 
 export function markPage(text: string, version: string) {