private static async Task TrackAndSendNotificationsAsync(Sortation sortation, NotificationSubscription subscription)
{
// In a realistic case, some other backend process would track
// sortation delivery progress and send us notifications when it
// changes. Since we don't have any such process here, fake it.
//await Task.Delay(PurchaseItem.PreparationDuration);
//await SendNotificationAsync(sortation, subscription, "Your sortation has been dispatched!");
//await Task.Delay(PurchaseItem.DeliveryDuration);
//await SendNotificationAsync(sortation, subscription, "Your sortation is now delivered. Enjoy!");
}
public async Task <Sortation> SaveAsync(Sortation sortation)
{
if (sortation.Id == 0)
{
var sortations = await ListAsync(sortation.CategoryId);
sortation.Order = sortations.Count;
_sortationService.Create(sortation);
}
else
{
_sortationService.Update(sortation);
}
await _sortationService.SaveChangesAsync();
return(sortation);
}
public async Task <ActionResult <int> > SaveSortation(Sortation sortation)
{
// Enforce existence of Pizza.SpecialId and Topping.ToppingId
// in the database - prevent the submitter from making up
// new specials and toppings
_db.Sortations.Attach(sortation);
await _db.SaveChangesAsync();
// In the background, send push notifications if possible
var subscription = await _db.NotificationSubscriptions.Where(e => e.UserId == GetUserId()).SingleOrDefaultAsync();
if (subscription != null)
{
_ = TrackAndSendNotificationsAsync(sortation, subscription);
}
return(sortation.Id);
}
private static async Task SendNotificationAsync(Sortation sortation, NotificationSubscription subscription, string message)
{
// For a real application, generate your own
var publicKey = "BLC8GOevpcpjQiLkO7JmVClQjycvTCYWm6Cq_a7wJZlstGTVZvwGFFHMYfXt6Njyvgx_GlXJeo5cSiZ1y4JOx1o";
var privateKey = "OrubzSz3yWACscZXjFQrrtDwCKg-TGFuWhluQ2wLXDo";
var pushSubscription = new PushSubscription(subscription.Url, subscription.P256dh, subscription.Auth);
var vapidDetails = new VapidDetails("mailto:<*****@*****.**>", publicKey, privateKey);
var webPushClient = new WebPushClient();
try
{
var payload = JsonSerializer.Serialize(new
{
message,
url = $"mysortations/{sortation.Id}",
});
await webPushClient.SendNotificationAsync(pushSubscription, payload, vapidDetails);
}
catch (Exception ex)
{
Console.Error.WriteLine("Error sending push notification: " + ex.Message);
}
}
public void Update(Sortation sortation)
{
}
public void Create(Sortation sortation)
{
}