feat: add desktop notifications and skills updates

server/modules/notifications/websocket/desktop-notifications-websocket.service.ts

@@ -0,0 +1,109 @@
+import type { WebSocket } from 'ws';
+
+import {
+  registerDesktopNotificationClient,
+  unregisterDesktopNotificationClient,
+} from '@/modules/notifications/services/desktop-notification-clients.service.js';
+import type { AuthenticatedWebSocketRequest } from '@/shared/types.js';
+import { parseIncomingJsonObject } from '@/shared/utils.js';
+
+type DesktopNotificationRegisterMessage = {
+  type?: unknown;
+  kind?: unknown;
+  deviceId?: unknown;
+  label?: unknown;
+  platform?: unknown;
+  appVersion?: unknown;
+};
+
+function readRequestUserId(request: AuthenticatedWebSocketRequest): number | null {
+  const user = request.user;
+  const rawUserId = typeof user?.id === 'number' || typeof user?.id === 'string'
+    ? user.id
+    : typeof user?.userId === 'number' || typeof user?.userId === 'string'
+      ? user.userId
+      : null;
+  const numericUserId = Number(rawUserId);
+  return Number.isInteger(numericUserId) && numericUserId > 0 ? numericUserId : null;
+}
+
+function readOptionalString(value: unknown): string | null {
+  if (typeof value !== 'string') return null;
+  const normalized = value.trim();
+  return normalized || null;
+}
+
+function sendJson(ws: WebSocket, payload: unknown): void {
+  if (ws.readyState === ws.OPEN) {
+    ws.send(JSON.stringify(payload));
+  }
+}
+
+export function handleDesktopNotificationsConnection(
+  ws: WebSocket,
+  request: AuthenticatedWebSocketRequest
+): void {
+  const userId = readRequestUserId(request);
+  if (!userId) {
+    ws.close(1008, 'Missing authenticated user');
+    return;
+  }
+
+  let registered = false;
+
+  ws.on('message', (rawMessage) => {
+    const data = parseIncomingJsonObject(rawMessage) as DesktopNotificationRegisterMessage | null;
+    if (!data) {
+      return;
+    }
+
+    const type = typeof data.type === 'string' ? data.type : typeof data.kind === 'string' ? data.kind : '';
+    if (type === 'notification_ack') {
+      return;
+    }
+
+    if (type !== 'register' || registered) {
+      return;
+    }
+
+    const deviceId = readOptionalString(data.deviceId);
+    if (!deviceId) {
+      sendJson(ws, {
+        type: 'error',
+        code: 'DEVICE_ID_REQUIRED',
+        message: 'Desktop notification registration requires deviceId.',
+      });
+      ws.close(1008, 'Missing deviceId');
+      return;
+    }
+
+    const device = registerDesktopNotificationClient({
+      userId,
+      deviceId,
+      label: readOptionalString(data.label),
+      platform: readOptionalString(data.platform),
+      appVersion: readOptionalString(data.appVersion),
+      ws,
+    });
+
+    if (!device) {
+      ws.close(1011, 'Registration failed');
+      return;
+    }
+
+    registered = true;
+    sendJson(ws, {
+      type: 'registered',
+      deviceId: device.endpoint_id,
+      enabled: Boolean(device.enabled),
+    });
+  });
+
+  ws.on('close', () => {
+    unregisterDesktopNotificationClient(ws);
+  });
+
+  ws.on('error', () => {
+    unregisterDesktopNotificationClient(ws);
+  });
+}