FCM (Firebase Cloud Messaging) Push Notification with Asp.Net

Question

I have already push the GCM message to google server using asp .net in following method,

GCM Push Notification with Asp.Net

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Answer 1

To hit Firebase API we need some information from Firebase, we need the API URL (https://fcm.googleapis.com/fcm/send) and unique keys that identify our Firebase project for security reasons.

We can use this method to send notifications from .NET Core backend:

        public async Task<bool> SendNotificationAsync(string token, string title, string body)
    {
        using (var client = new HttpClient())
        {
            var firebaseOptionsServerId = _firebaseOptions.ServerApiKey;
            var firebaseOptionsSenderId = _firebaseOptions.SenderId;

            client.BaseAddress = new Uri("https://fcm.googleapis.com");
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            client.DefaultRequestHeaders.TryAddWithoutValidation("Authorization",
                $"key={firebaseOptionsServerId}");
            client.DefaultRequestHeaders.TryAddWithoutValidation("Sender", $"id={firebaseOptionsSenderId}");


            var data = new
            {
                to = token,
                notification = new
                {
                    body = body,
                    title = title,
                },
                priority = "high"
            };

            var json = JsonConvert.SerializeObject(data);
            var httpContent = new StringContent(json, Encoding.UTF8, "application/json");

            var result = await _client.PostAsync("/fcm/send", httpContent);
            return result.StatusCode.Equals(HttpStatusCode.OK);
        }
    }

These parameters are:

• token: string represents a FCM token provided by Firebase on each app-installation. This is going to be the list of app-installations that the notification is going to send.
• title: It’s the bold section of notification.
• body: It represents “Message text” field of the Firebase SDK, this is the message you want to send to the users.

To find your Sender ID and API key you have to:

• Login to the Firebase Developer Console and go to your Dashboard
• Click on the “gear” icon and access “project settings”
• Go to the “Cloud Messaging Section” and you will have access to the sender ID and the API Key.