Integrate Firebase

lib/helpers/firebase_messaging_helper.dart

@@ -0,0 +1,26 @@
+import 'package:firebase_core/firebase_core.dart';
+import 'package:firebase_messaging/firebase_messaging.dart';
+
+/// Firebase messaging helper
+///
+/// @author Pierre Hubert
+
+bool _isFirebaseReady = false;
+
+class FirebaseMessagingHelper {
+  /// Pre configure notifications
+  static Future<void> preConfigure() async {
+    if (!_isFirebaseReady) await Firebase.initializeApp();
+    _isFirebaseReady = true;
+
+    final settings = await FirebaseMessaging.instance.requestPermission();
+
+    if (settings.authorizationStatus != AuthorizationStatus.authorized)
+      throw new Exception("The user did not authorize notifications!");
+  }
+
+  /// Get a Firebase access token
+  static Future<String> getToken() async {
+    return await FirebaseMessaging.instance.getToken();
+  }
+}