feat(dm): implement signed direct messaging with web push fallback

shine-UI/firebase-messaging-sw.js

@@ -1,30 +1,20 @@
-/* global importScripts, firebase */
-importScripts('https://www.gstatic.com/firebasejs/10.12.2/firebase-app-compat.js');
-importScripts('https://www.gstatic.com/firebasejs/10.12.2/firebase-messaging-compat.js');
-
 self.addEventListener('install', () => self.skipWaiting());
 self.addEventListener('activate', (event) => event.waitUntil(self.clients.claim()));
 
-// Заполните теми же значениями, что и в shine-UI/index.html
-const FIREBASE_CONFIG = {
-  apiKey: '',
-  authDomain: '',
-  projectId: '',
-  messagingSenderId: '',
-  appId: '',
-};
-
-if (FIREBASE_CONFIG.apiKey && firebase && firebase.messaging) {
-  if (!firebase.apps.length) {
-    firebase.initializeApp(FIREBASE_CONFIG);
+self.addEventListener('push', (event) => {
+  let body = 'Новое сообщение SHiNE';
+  try {
+    if (event.data) {
+      const text = event.data.text();
+      body = text || body;
+    }
+  } catch {
+    // ignore
   }
-  const messaging = firebase.messaging();
-  messaging.onBackgroundMessage((payload) => {
-    const title = payload?.notification?.title || 'Новое сообщение';
-    const options = {
-      body: payload?.notification?.body || '',
-      data: payload?.data || {},
-    };
-    self.registration.showNotification(title, options);
-  });
-}
+
+  event.waitUntil(self.registration.showNotification('SHiNE: входящее сообщение', {
+    body,
+    tag: 'shine-direct-message',
+    renotify: true,
+  }));
+});