added push notifications

frontend/services/notifications.tsx

@@ -0,0 +1,35 @@
+import {
+    getMessaging,
+    requestPermission,
+    getToken,
+    onTokenRefresh,
+    AuthorizationStatus,
+} from '@react-native-firebase/messaging';
+import { post } from '@/services/api';
+
+export async function registerDeviceToken(authToken: string): Promise<void> {
+    const messaging = getMessaging();
+    const status = await requestPermission(messaging);
+    const granted =
+        status === AuthorizationStatus.AUTHORIZED ||
+        status === AuthorizationStatus.PROVISIONAL;
+
+    if (!granted) return;
+
+    const fcmToken = await getToken(messaging);
+
+    await fetch(`${process.env.EXPO_PUBLIC_API_URL}/device-tokens/register`, {
+        method: 'POST',
+        headers: {
+            'Content-Type': 'application/json',
+            'Authorization': `Bearer ${authToken}`,
+        },
+        body: JSON.stringify({ token: fcmToken }),
+    });
+}
+
+export function listenForTokenRefresh(authToken: string): () => void {
+    return onTokenRefresh(getMessaging(), async (newToken) => {
+        await post('/device-tokens/register', { token: newToken }, authToken);
+    });
+}