public async Task RequestRosterAsync()
{
var rosterIq = await xmppClient.RequestRosterAsync();
var rosterItems
= rosterIq
.Query
.Cast <Roster>()
.GetRoster();
await Observable.Start(() =>
{
foreach (var ri in rosterItems)
{
var contact = mapper.Map <Contact>(ri);
if (userAvatarStorage.HasUserAvatar(contact.Jid))
{
var hash = userAvatarStorage.GetUserAvatar(contact.Jid).Hash;
contact.AvatarBytes = avatarStorage.GetAvatar(hash)?.ImageBytes;
}
contacts.AddOrReplace(contact, c => c.Jid == contact.Jid);
}
}, RxApp.MainThreadScheduler);
}
public AvatarCollectionHandler(
IAvatarStorage avatarStorage,
IUserAvatarStorage userAvatarStorage,
ViewModel.Account account,
ViewModel.Contacts contacts)
{
this.avatarStorage = avatarStorage;
this.userAvatarStorage = userAvatarStorage;
this.contacts = contacts;
Handle(
el =>
el.OfType <Message>() &&
el.HasDescendants <Event>() &&
el.HasDescendants <Metadata>(),
async(context, el) =>
{
var msg = el.Cast <Message>();
var metaData = el.Descendants <Metadata>().First();
if (metaData.Info != null)
{
var id = metaData.Info.Id;
var from = msg.From.Bare;
if (!avatarStorage.HasAvatar(id))
{
await RequestAvatar(from, id);
}
if (contacts.Contains(from))
{
// avatar of a contact
contacts[from].AvatarBytes = avatarStorage.GetAvatar(id)?.ImageBytes;
}
else if (account.XmppId == from)
{
//our own avatar
account.AvatarBytes = avatarStorage.GetAvatar(id)?.ImageBytes;
}
}
});
}