Created login and error handling to get auth token. Refreshing not handled.

BodyshopUploader/Utils/UiConverters.cs

@@ -0,0 +1,44 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Data;
+
+namespace BodyshopUploader.Utils
+{
+    public class BoolVisibilityConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if ((bool)value)
+                return Visibility.Visible;
+            else
+                return Visibility.Collapsed;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotSupportedException("Two-way binding not supported by BoolVisibilityConverter");
+        }
+    }
+
+    public class NullVisibilityConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value == null)
+                return Visibility.Collapsed;
+            else
+                return Visibility.Visible;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotSupportedException("Two-way binding not supported by ZeroVisibilityConverter");
+        }
+    }
+
+}