Hey. I'm trying to send out web notifications whenever a new article is published for the frist time.

I've got it for the most part. The notifications are sending, but there's a few things im missing that i can't work out.

public class UmbracoEventInterceptor : ApplicationEventHandler
{
    // Constructor method
    public UmbracoEventInterceptor()
    {
        //ContentService.Published += sendPushNotifications;
        ContentService.Publishing += sendPushNotifications;
    }

    private void sendPushNotifications(IPublishingStrategy sender, PublishEventArgs<IContent> args)
    {
        string sql = null;

        using (SqlConnection cnn = new SqlConnection(ConfigurationManager.ConnectionStrings["umbracoDbDSN"].ConnectionString))
        {
            sql = "SELECT [Endpoint],[Key],[AuthSecret] FROM [dbo].[PushNotificationSubscriptions]";
            using (SqlCommand cmd = new SqlCommand(sql, cnn))
            {
                cnn.Open();
                DataSet dSet = new DataSet();
                DataTable dt = new DataTable();
                SqlDataAdapter da = new SqlDataAdapter(cmd);

                try
                {
                    da.Fill(dSet);
                    dt = dSet.Tables[0];

                    //loop through each endpoint
                    foreach (DataRow a in dt.Rows)
                    {
                        //loop through each published article. (hopefully only the one)
                        foreach (var entity in args.PublishedEntities)
                        {
                            //only send notification if not already published and is an article
                            if (!entity.HasIdentity && !entity.HasPublishedVersion && entity.ContentType.Alias == "newsItem")
                            {
                                PushSubscription subscription = new PushSubscription(a["Endpoint"].ToString(), a["Key"].ToString().Replace(" ", "+"), a["AuthSecret"].ToString().Replace(" ", "+"));
                                string payload = "{\"Title\": \"New Article!\", \"Description\": \"" + entity.Name + "\", \"Url\": \"https://www.WEBSITENAME.com\"}";
                                NotificationsController.createNotification(subscription, payload);
                            }

                        }
                    }
                }
                catch (SqlException)
                {
                    throw;
                }

                if (cnn.State == ConnectionState.Open)
                    cnn.Close();
            }
        }
    }
}

Basically it just loops through a table in the database and sends out notifications to each endpoint.

1. I need the URL for the newly published page, but cant access it yet. how can i, and still know that it hasn't been published before?
2. once the notifications are sent, the function seems to just hang for an unknown reason. I dont get any errors come up either.

At the moment this is just a proof of concept. Any ideas for better implementations would be considered :)