Adds converter for Upload field

Our.Umbraco.PropertyConverters/Our.Umbraco.PropertyConverters.csproj

@@ -268,6 +268,7 @@
     <Compile Include="MediaPickerPropertyConverter.cs" />
     <Compile Include="MultiNodeTreePickerPropertyConverter.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="UploadPropertyConverter.cs" />
     <Compile Include="Utilities\ConverterHelper.cs" />
   </ItemGroup>
   <ItemGroup>

Our.Umbraco.PropertyConverters/UploadPropertyConverter.cs

@@ -0,0 +1,101 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Our.Umbraco.PropertyConverters.Utilities;
+using Umbraco.Core;
+using Umbraco.Core.Models.PublishedContent;
+using Umbraco.Core.PropertyEditors;
+
+namespace Our.Umbraco.PropertyConverters
+{
+    /// <summary>
+    /// The upload property value converter.
+    /// </summary>
+    public class UploadPropertyConverter : PropertyValueConverterBase, IPropertyValueConverterMeta
+    {
+        /// <summary>
+        /// Checks if this converter can convert the property editor and registers if it can.
+        /// </summary>
+        /// <param name="propertyType">
+        /// The published property type.
+        /// </param>
+        /// <returns>
+        /// The <see cref="bool"/>.
+        /// </returns>
+        public override bool IsConverter(PublishedPropertyType propertyType)
+        {
+            return propertyType.PropertyEditorAlias.Equals(Constants.PropertyEditors.UploadFieldAlias);
+        }
+
+        /// <summary>
+        /// The CLR type that the value converter returns.
+        /// </summary>
+        /// <param name="propertyType">
+        /// The property type.
+        /// </param>
+        /// <returns>
+        /// The <see cref="Type"/>.
+        /// </returns>
+        public Type GetPropertyValueType(PublishedPropertyType propertyType)
+        {
+            return typeof(string);
+        }
+
+        /// <summary>
+        /// Convert the source object to a string
+        /// </summary>
+        /// <param name="propertyType">
+        /// The published property type.
+        /// </param>
+        /// <param name="source">
+        /// The value of the property
+        /// </param>
+        /// <param name="preview">
+        /// The preview.
+        /// </param>
+        /// <returns>
+        /// The <see cref="object"/>.
+        /// </returns>
+        public override object ConvertSourceToObject(PublishedPropertyType propertyType, object source, bool preview)
+        {
+            return (source ?? "").ToString();
+        }
+
+        /// <summary>
+        /// The get property cache level.
+        /// </summary>
+        /// <param name="propertyType">
+        /// The property type.
+        /// </param>
+        /// <param name="cacheValue">
+        /// The cache value.
+        /// </param>
+        /// <returns>
+        /// The <see cref="PropertyCacheLevel"/>.
+        /// </returns>
+        public PropertyCacheLevel GetPropertyCacheLevel(PublishedPropertyType propertyType, PropertyCacheValue cacheValue)
+        {
+            PropertyCacheLevel returnLevel;
+            switch (cacheValue)
+            {
+                case PropertyCacheValue.Object:
+                    returnLevel = ConverterHelper.ModeFixed() ? PropertyCacheLevel.ContentCache : PropertyCacheLevel.Request;
+                    break;
+                case PropertyCacheValue.Source:
+                    returnLevel = PropertyCacheLevel.Content;
+                    break;
+                case PropertyCacheValue.XPath:
+                    returnLevel = PropertyCacheLevel.Content;
+                    break;
+                default:
+                    returnLevel = PropertyCacheLevel.None;
+                    break;
+            }
+
+            return returnLevel;
+        }
+
+    }
+}