NotificationHub send notification in registered tag UWP

Question

Is there a way to send a notification with UWP app through NotificationHub? In many tutorials they send notifications with a C# console application using Microsoft.Azure.NotificationHubs Nuget package. I cannot install this package in a UWP app. Can i specifically send a notification to a tagged device that i register with RegisterNativeAsync?

Answer 1

Per my experience, I think the simple way for sending notification in a UWP app is to using Notification Hub REST APIs via HttpClient, without the issues for platform compatibility.

Please refer to the document Notification Hubs REST APIs .

You can try to refer to the doc Using REST APIs from a Backend to make your UWP app as a backend to send messages. For example, Send a WNS Native Notification .

Hope it helps.

Answer 2

Here's a working code that sends a notification from a UWP through an Azure Notification Hub (However, it uses GCM instead of WNS, see how to change the code in the approved answer). It obviously needs a few changes like your hub's name, see the comments in the code for more info.

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Text;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.Security.Cryptography;
using Windows.Security.Cryptography.Core;
using Windows.Storage.Streams;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;


namespace SendNotification
{
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();
            this.sendNotification();
        }

        string Endpoint = "";
        string SasKeyName = "";
        string SasKeyValue = "";

        public void ConnectionStringUtility(string connectionString)
        {
            //Parse Connectionstring
            char[] separator = { ';' };
            string[] parts = connectionString.Split(separator);
            for (int i = 0; i < parts.Length; i++)
            {
                if (parts[i].StartsWith("Endpoint"))
                    Endpoint = "https" + parts[i].Substring(11);
                if (parts[i].StartsWith("SharedAccessKeyName"))
                    SasKeyName = parts[i].Substring(20);
                if (parts[i].StartsWith("SharedAccessKey"))
                    SasKeyValue = parts[i].Substring(16);
            }
        }


        public string getSaSToken(string uri, int minUntilExpire)
        {
            string targetUri = Uri.EscapeDataString(uri.ToLower()).ToLower();

            // Add an expiration in seconds to it.
            long expiresOnDate = DateTime.Now.Ticks / TimeSpan.TicksPerMillisecond;
            expiresOnDate += minUntilExpire * 60 * 1000;
            long expires_seconds = expiresOnDate / 1000;
            String toSign = targetUri + "\n" + expires_seconds;

            // Generate a HMAC-SHA256 hash or the uri and expiration using your secret key.
            MacAlgorithmProvider macAlgorithmProvider = MacAlgorithmProvider.OpenAlgorithm(MacAlgorithmNames.HmacSha256);
            BinaryStringEncoding encoding = BinaryStringEncoding.Utf8;
            var messageBuffer = CryptographicBuffer.ConvertStringToBinary(toSign, encoding);
            IBuffer keyBuffer = CryptographicBuffer.ConvertStringToBinary(SasKeyValue, encoding);
            CryptographicKey hmacKey = macAlgorithmProvider.CreateKey(keyBuffer);
            IBuffer signedMessage = CryptographicEngine.Sign(hmacKey, messageBuffer);

            string signature = Uri.EscapeDataString(CryptographicBuffer.EncodeToBase64String(signedMessage));

            return "SharedAccessSignature sr=" + targetUri + "&sig=" + signature + "&se=" + expires_seconds + "&skn=" + SasKeyName;
        }


        public async void sendNotification()
        {
            ConnectionStringUtility("YOURHubFullAccess"); //insert your HubFullAccess here (a string that can be copied from the Azure Portal by clicking Access Policies on the Settings blade for your notification hub)

            //replace YOURHUBNAME with whatever you named your notification hub in azure 
            var uri = Endpoint + "YOURHUBNAME" + "/messages/?api-version=2015-01";
            string json = "{\"data\":{\"message\":\"" + "Hello World!" + "\"}}";


            //send an HTTP POST request
            using (var httpClient = new HttpClient())
            {
                var request = new HttpRequestMessage(HttpMethod.Post, uri);
                request.Content = new StringContent(json);

                request.Headers.Add("Authorization", getSaSToken(uri, 1000));
                request.Headers.Add("ServiceBusNotification-Format", "gcm");
                var response = await httpClient.SendAsync(request);
                await response.Content.ReadAsStringAsync();
            }
        }
    }
}

Answer 3

I finally found the solution. The code is like @Kyle but i had to add

request.Headers.Add("X-WNS-Type", "wns/toast");

in order to send a push notification

M ore details

Answer 4

Did you try WindowsAzure.Messaging.Managed? Just tried it with the W10 UWP.

https://azure.microsoft.com/en-us/documentation/articles/notification-hubs-windows-store-dotnet-get-started/