public override async Task SaveAsync(Account account, string serviceId)
{
byte[] data = Encoding.UTF8.GetBytes(account.Serialize());
byte[] prot = (await DataProtectionExtensions.ProtectAsync(data).ConfigureAwait(false)).ToArray();
var path = GetAccountPath(account, serviceId);
var localFolder = ApplicationData.Current.LocalFolder;
var file = await localFolder.CreateFileAsync(path, CreationCollisionOption.OpenIfExists).AsTask().ConfigureAwait(false);
using (var stream = await file.OpenStreamForWriteAsync().ConfigureAwait(false))
using (var writer = new BinaryWriter(stream)) {
writer.Write(prot.Length);
writer.Write(prot);
}
}
public override async Task <List <Account> > FindAccountsForServiceAsync(string serviceId)
{
var localFolder = ApplicationData.Current.LocalFolder;
var files = await localFolder.GetFilesAsync().AsTask().ConfigureAwait(false);
var accounts = new List <Account>();
foreach (var file in files.Where(x => x.Name.StartsWith("xamarin.auth.") &&
x.Name.EndsWith("." + serviceId))
.ToList())
{
using (var stream = await file.OpenStreamForReadAsync().ConfigureAwait(false))
using (var reader = new BinaryReader(stream)) {
var length = reader.ReadInt32();
var data = reader.ReadBytes(length);
var unprot = (await DataProtectionExtensions.UnprotectAsync(data).ConfigureAwait(false)).ToArray();
accounts.Add(Account.Deserialize(Encoding.UTF8.GetString(unprot, 0, unprot.Length)));
}
}
return(accounts);
}
