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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using Tango.BL.Enumerations;
using Tango.Core.DI;
using Tango.FSE.Common.Authentication;
namespace Tango.FSE.Common.Authorization
{
public static class AuthorizationHelper
{
private static IAuthenticationProvider _authenticationProvider;
private static List<FrameworkElement> _elements;
private static bool _initialized;
static AuthorizationHelper()
{
_elements = new List<FrameworkElement>();
}
#region Mode
/// <summary>
/// Determined the resolution mode for the trigger.
/// </summary>
public static readonly DependencyProperty ModeProperty =
DependencyProperty.RegisterAttached("Mode",
typeof(BlockingMode?), typeof(AuthorizationHelper),
new FrameworkPropertyMetadata(null, Invalidate));
/// <summary>
/// Sets the Mode attached property.
/// </summary>
/// <param name="element">The element.</param>
/// <param name="value">if set to <c>true</c> [value].</param>
public static void SetMode(FrameworkElement element, BlockingMode? value)
{
element.SetValue(ModeProperty, value);
}
/// <summary>
/// Gets the Mode attached property.
/// </summary>
/// <param name="element">The element.</param>
/// <returns></returns>
public static BlockingMode? GetMode(FrameworkElement element)
{
return (BlockingMode?)element.GetValue(ModeProperty);
}
#endregion
#region Permission
/// <summary>
/// Determined the resolution Permission for the trigger.
/// </summary>
public static readonly DependencyProperty PermissionProperty =
DependencyProperty.RegisterAttached("Permission",
typeof(Permissions?), typeof(AuthorizationHelper),
new FrameworkPropertyMetadata(null, Invalidate));
/// <summary>
/// Sets the Permission attached property.
/// </summary>
/// <param name="element">The element.</param>
/// <param name="value">if set to <c>true</c> [value].</param>
public static void SetPermission(FrameworkElement element, Permissions? value)
{
element.SetValue(PermissionProperty, value);
}
/// <summary>
/// Gets the Permission attached property.
/// </summary>
/// <param name="element">The element.</param>
/// <returns></returns>
public static Permissions? GetPermission(FrameworkElement element)
{
return (Permissions?)element.GetValue(PermissionProperty);
}
#endregion
private static void Invalidate(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
FrameworkElement element = d as FrameworkElement;
if (element != null)
{
if (!_initialized)
{
_initialized = true;
TangoIOC.Default.GetInstanceWhenAvailable<IAuthenticationProvider>((x) =>
{
_authenticationProvider = x;
_authenticationProvider.CurrentUserChanged += _authenticationProvider_CurrentUserChanged;
});
}
Invalidate(element);
}
}
private static void Invalidate(FrameworkElement element)
{
if (!_elements.Contains(element))
{
_elements.Add(element);
element.Unloaded += Element_Unloaded;
}
if (_authenticationProvider == null) return;
var currentUser = _authenticationProvider.CurrentUser;
var permission = GetPermission(element);
var mode = GetMode(element);
if (currentUser != null && permission != null && mode != null)
{
bool hasPermission = currentUser.HasPermission(permission.Value);
if (!hasPermission)
{
if (mode == BlockingMode.Collapsed)
{
element.Visibility = Visibility.Collapsed;
}
else if (mode == BlockingMode.Hidden)
{
element.Visibility = Visibility.Hidden;
}
else if (mode == BlockingMode.Disabled)
{
element.IsEnabled = false;
}
}
else
{
if (mode == BlockingMode.Collapsed || mode == BlockingMode.Hidden)
{
element.Visibility = Visibility.Visible;
}
else if (mode == BlockingMode.Disabled)
{
element.IsEnabled = true;
}
}
}
}
private static void Element_Unloaded(object sender, RoutedEventArgs e)
{
FrameworkElement element = sender as FrameworkElement;
if (element != null)
{
element.Unloaded -= Element_Unloaded;
}
}
private static void _authenticationProvider_CurrentUserChanged(object sender, Tango.BL.Entities.User e)
{
foreach (var element in _elements.ToList())
{
Invalidate(element);
}
}
}
}
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