protected async Task LoadDeviceIDFromStorage()
{
DeviceId dId = await Storage.Instance.LoadFromFile <DeviceId>(deviceFilename);
bool saveAfterLoading = false;
if (dId == null)
{
// if it's null then either there is no device Id saved or it's saved
// in the legacy format as just a string. Try deserializing that
String backupDeviceId = await Storage.Instance.LoadFromFile <string>(deviceFilename);
if (backupDeviceId != null)
{
//it was in the backup format, assume it's Guid
dId = new DeviceId(backupDeviceId, DeviceIdMethodInternal.windowsGUID);
saveAfterLoading = true;
}
}
if (dId?.deviceId != null)
{
deviceId = dId.deviceId;
usedIdMethod = dId.deviceIdMethod;
}
if (saveAfterLoading)
{
//it must have been in the legacy format, save it before continueing
await SaveDeviceIDToStorage();
}
}
/// <summary>
/// Returns the unique device identificator
/// </summary>
internal async Task <string> GetDeviceId()
{
try
{
if (deviceId != null)
{
return(deviceId);
}
await LoadDeviceIDFromStorage();
if (deviceId == null)
{
DeviceId dId = ComputeDeviceID();
deviceId = dId.deviceId;
usedIdMethod = dId.deviceIdMethod;
await SaveDeviceIDToStorage();
}
return(deviceId);
}
catch
{
//todo log
return(String.Empty);
}
}
/// <summary>
/// Set preferred method for generating device id. If a Id is already provided, use that and
/// set method to developerSupplied
/// </summary>
/// <param name="deviceIdMethod">preferred method</param>
/// <param name="suppliedDeviceId">device id to use</param>
/// <returns></returns>
internal async Task SetPreferredDeviceIdMethod(DeviceIdMethodInternal deviceIdMethod, String suppliedDeviceId = null)
{
if (suppliedDeviceId != null)
{
deviceId = suppliedDeviceId;
usedIdMethod = DeviceIdMethodInternal.developerSupplied;
preferredIdMethod = usedIdMethod;
await SaveDeviceIDToStorage();
}
else
{
preferredIdMethod = deviceIdMethod;
}
}
