add structure

lib/model/messaging.dart

@@ -0,0 +1,35 @@
+import 'package:firebase_messaging/firebase_messaging.dart';
+import 'package:logging/logging.dart';
+import 'package:fcs/vo/user.dart';
+
+class MessagingFCM {
+  final log = Logger('MessagingFCM');
+
+  final FirebaseMessaging _firebaseMessaging = FirebaseMessaging();
+
+  MessagingFCM(User user) {
+    _firebaseMessaging.configure(
+      onMessage: (Map<String, dynamic> message) async {
+        log.info("onMessage: $message");
+      },
+      // onBackgroundMessage: backgroundMessageHandler,
+      onLaunch: (Map<String, dynamic> message) async {
+        log.info("onLaunch: $message");
+      },
+      onResume: (Map<String, dynamic> message) async {
+        log.info("onResume: $message");
+      },
+    );
+    _firebaseMessaging.requestNotificationPermissions(
+        const IosNotificationSettings(
+            sound: true, badge: true, alert: true, provisional: true));
+    _firebaseMessaging.onIosSettingsRegistered
+        .listen((IosNotificationSettings settings) {
+      log.info("Settings registered: $settings");
+    });
+    _firebaseMessaging.getToken().then((String token) {
+      log.info("Token:$token");
+    });
+    _firebaseMessaging.subscribeToTopic(user.docID);
+  }
+}