Push messages topics

Author: tpeczek

Lib.Net.Http.WebPush/PushMessage.cs

@@ -12,6 +12,11 @@ public class PushMessage
         #endregion
 
         #region Properties
+        /// <summary>
+        /// Gets or sets the topic (used to correlate messages sent to the same subscription).
+        /// </summary>
+        public string Topic { get; set; }
+
         /// <summary>
         /// Gets or sets the content.
         /// </summary>

Lib.Net.Http.WebPush/PushServiceClient.cs

@@ -26,6 +26,7 @@ public class PushServiceClient
     {
         #region Fields
         private const string TTL_HEADER_NAME = "TTL";
+        private const string TOPIC_HEADER_NAME = "Topic";
         private const string URGENCY_HEADER_NAME = "Urgency";
         private const string CRYPTO_KEY_HEADER_NAME = "Crypto-Key";
         private const string WEBPUSH_AUTHENTICATION_SCHEME = "WebPush";
@@ -172,6 +173,7 @@ private HttpRequestMessage PreparePushMessageDeliveryRequest(PushSubscription su
                 }
             };
             pushMessageDeliveryRequest = SetAuthentication(pushMessageDeliveryRequest, subscription, authentication, authenticationScheme);
+            pushMessageDeliveryRequest = SetTopic(pushMessageDeliveryRequest, message);
             pushMessageDeliveryRequest = SetContent(pushMessageDeliveryRequest, subscription, message);
 
             return pushMessageDeliveryRequest;
@@ -197,6 +199,16 @@ private static HttpRequestMessage SetAuthentication(HttpRequestMessage pushMessa
             return pushMessageDeliveryRequest;
         }
 
+        private static HttpRequestMessage SetTopic(HttpRequestMessage pushMessageDeliveryRequest, PushMessage message)
+        {
+            if (!String.IsNullOrWhiteSpace(message.Topic))
+            {
+                pushMessageDeliveryRequest.Headers.Add(TOPIC_HEADER_NAME, message.Topic);
+            }
+
+            return pushMessageDeliveryRequest;
+        }
+
         private static HttpRequestMessage SetContent(HttpRequestMessage pushMessageDeliveryRequest, PushSubscription subscription, PushMessage message)
         {
             if (String.IsNullOrEmpty(message.Content))