AimWhy · February 28, 2025 13:42 · Feb 28, 2025 · Feb 28, 2025
diff --git a/gistfile1.txt → broadcast.js b/gistfile1.txt → broadcast.js
diff --git a/gistfile1.txt b/gistfile1.txt
@@ -0,0 +1,53 @@
+"use strict";
+
+self.addEventListener('install', (event) => {
+    event.waitUntil(self.skipWaiting());
+});
+
+self.addEventListener('activate', (event) => {
+    event.waitUntil(self.clients.claim());
+});
+
+self.addEventListener('message', (event) => {
+    switch (event.data.type) {
+        case "broadcast":
+            const message = event.data;
+            message.sender_id = event.source.id;
+
+            event.waitUntil(messageClients(message));
+            break;
+        default:
+            console.info("Service Worker: unknown message", event);
+    }
+});
+
+self.addEventListener("notificationclick", (event) => {
+    const notification = event.notification;
+    const localURL = ensureLocalURL(notification.data ? notification.data.url : void 0);
+    event.waitUntil(focusWindow(localURL));
+});
+
+// Relay a message to all clients (including the sender)
+function messageClients(message) {
+    return self.clients.matchAll().then((clientList) => {
+        clientList.forEach((client) => {
+            client.postMessage(message);
+        })
+    });
+}
+
+// Try to focus a tab with the given url. When such a tab is not found, a new one will be opened.
+function focusWindow(url) {
+    return clients.matchAll({ type: "window" }).then((clientList) => {
+        // Check if there already is a tab with has this url open.
+        for (const client of clientList) {
+            if ((client.url === url) && ('focus' in client)) {
+                return client.focus();
+            }
+        }
+
+        if (clients.openWindow) {
+            return clients.openWindow(url);
+        }
+    });
+}
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