/// <summary>
/// Initializes a new instance of the <see cref="ContactResourcePresence"/> class using
/// the given session.
/// </summary>
/// <param name="session"></param>
internal ContactResourcePresence(ContactResource resource)
{
var transport = XmppTransportManager.GetTransport();
this.resource = resource;
this.presenceStream = new Subject <ContactResource>();
this.ShowAs = ShowType.Offline;
transport.StateChanged
.Where(state => state == XmppTransportState.Closing)
.Subscribe(state => OnDisconnecting());
}
private async Task OnPresenceChangedAsync(Presence message)
{
var transport = XmppTransportManager.GetTransport();
var resource = this.resources.SingleOrDefault(contactResource => contactResource.Address == message.From);
if (resource == null)
{
resource = new ContactResource(message.From, message);
this.resources.Add(resource);
this.newResourceStream.OnNext(resource);
if (transport.ServerCapabilities != null && resource.SupportsEntityCapabilities)
{
await resource.DiscoverCapabilitiesAsync().ConfigureAwait(false);
}
}
else
{
if (message.TypeSpecified)
{
switch (message.Type)
{
case PresenceType.Probe:
break;
case PresenceType.Subscribe:
// auto-accept subscription requests
await this.AcceptSubscriptionAsync().ConfigureAwait(false);
break;
case PresenceType.Unavailable:
this.UpdateResource(resource, message);
break;
case PresenceType.Unsubscribe:
await this.UnsuscribedAsync().ConfigureAwait(false);
break;
}
}
else
{
this.UpdateResource(resource, message);
}
}
this.RaisePropertyChanged(() => Resources);
this.RaisePropertyChanged(() => HighPriorityResource);
}
private void UpdateResource(ContactResource resource, Presence message)
{
resource.Update(message);
// Remove the resource information if the contact has gone offline
if (resource.IsOffline)
{
this.resources.Remove(resource);
this.removedResourceStream.OnNext(resource);
}
this.RaisePropertyChanged(() => Resources);
this.RaisePropertyChanged(() => HighPriorityResource);
}
private void OnDisconnecting()
{
this.resource = null;
this.presenceStream.Dispose();
}