/// <summary>
/// Wraps the specified action so the <see cref="AuthenticationService"/> can complete
/// processing of the operation before invoking the <paramref name="completeAction"/>.
/// </summary>
/// <typeparam name="T">The type of operation.</typeparam>
/// <param name="completeAction">The action to invoke once the service finishes
/// processing the operation. This parameter is optional.
/// </param>
/// <returns>An action that will complete processing of the operation before invoking
/// the wrapped action.
/// </returns>
private Action <T> WrapCompleteAction <T>(Action <T> completeAction) where T : AuthenticationOperation
{
return(new Action <T>(ao =>
{
bool raiseUserChanged = false;
bool raiseLoggedIn = false;
bool raiseLoggedOut = false;
// If the operation completed successfully, update the user and
// determine which events should be raised
if (!ao.IsCanceled && !ao.HasError && (ao.User != null))
{
if (this._user != ao.User)
{
raiseLoggedIn =
// anonymous -> authenticated
(this._user == null) ||
(!this._user.Identity.IsAuthenticated && ao.User.Identity.IsAuthenticated) ||
// authenticated -> authenticated
(ao.User.Identity.IsAuthenticated && (this._user.Identity.Name != ao.User.Identity.Name));
raiseLoggedOut =
// authenticated -> anonymous
(this._user != null) &&
(this._user.Identity.IsAuthenticated && !ao.User.Identity.IsAuthenticated);
this._user = ao.User;
raiseUserChanged = true;
}
}
// Setting the operation to null indicates the service is no longer busy and
// can process another operation
this.Operation = null;
// Invoke the wrapped action
if (completeAction != null)
{
try
{
completeAction.DynamicInvoke(ao);
}
catch (TargetInvocationException tie)
{
if (tie.InnerException != null)
{
throw tie.InnerException;
}
throw;
}
}
// Raise notification events as appropriate
if (raiseUserChanged)
{
this.RaisePropertyChanged(nameof(User));
}
this.RaisePropertyChanged(nameof(IsBusy));
this.RaisePropertyChanged(AuthenticationService.GetBusyPropertyName(ao));
if (raiseLoggedIn)
{
this.OnLoggedIn(new AuthenticationEventArgs(ao.User));
}
if (raiseLoggedOut)
{
this.OnLoggedOut(new AuthenticationEventArgs(ao.User));
}
}));
}
internal SaveUserOperation(AuthenticationService service, Action <SaveUserOperation> completeAction, object userState) :
base(service, userState)
{
this._completeAction = completeAction;
}
internal LoginOperation(AuthenticationService service, LoginParameters loginParameters, Action <LoginOperation> completeAction, object userState) :
base(service, userState)
{
this._loginParameters = loginParameters;
this._completeAction = completeAction;
}