/// <summary>
/// Runs the view model filter.
/// </summary>
/// <param name="hubContext">Hub context.</param>
/// <param name="vm">View model instance.</param>
public void RunVMFilters(DotNetifyHubContext hubContext, BaseVM vm, NextFilterDelegate finalFilter)
{
var nextFilters = new Stack <NextFilterDelegate>();
nextFilters.Push(finalFilter);
// Find and execute the filter that matches each view model class attribute.
foreach (var attr in vm.GetType().GetTypeInfo().GetCustomAttributes().Reverse())
{
var vmFilterType = typeof(IVMFilter <>).MakeGenericType(attr.GetType());
if (_vmFilterFactories.Keys.Any(t => vmFilterType.IsAssignableFrom(t)))
{
var vmFilter = _vmFilterFactories.FirstOrDefault(kvp => vmFilterType.IsAssignableFrom(kvp.Key)).Value();
var vmFilterInvokeMethod = vmFilterType.GetMethod(nameof(IVMFilter <Attribute> .Invoke));
if (vmFilterInvokeMethod != null)
{
nextFilters.Push(ctx => (Task)vmFilterInvokeMethod.Invoke(vmFilter, new object[] { attr, ctx, nextFilters.Pop() }));
}
}
}
var vmContext = new VMContext(hubContext, vm);
if (nextFilters.Count > 0)
{
nextFilters.Pop()(vmContext);
}
}
/// <summary>
/// Returns whether current security context is authorized to access a view model.
/// </summary>
/// <param name="vmInstance">View model instance.</param>
/// <returns>True if authorized.</returns>
protected virtual bool IsAuthorized(BaseVM vmInstance)
{
var authAttr = vmInstance.GetType().GetTypeInfo().GetCustomAttribute <AuthorizeAttribute>();
return(authAttr == null || authAttr.IsAuthorized(Principal));
}
