IdentityPart as a last resort GUID for references.

Adding it to htmlwidget and comment.

--HG--
branch : dev

src/Orchard.Web/Core/Common/Drivers/IdentityPartDriver.cs

@@ -0,0 +1,30 @@
+using JetBrains.Annotations;
+using Orchard.ContentManagement.Drivers;
+using Orchard.Core.Common.Models;
+using Orchard.Localization;
+
+namespace Orchard.Core.Common.Drivers {
+    [UsedImplicitly]
+    public class IdentityPartDriver : ContentPartDriver<IdentityPart> {
+        public IdentityPartDriver() {
+            T = NullLocalizer.Instance;
+        }
+
+        public Localizer T { get; set; }
+
+        protected override string Prefix {
+            get { return "Identity"; }
+        }
+
+        protected override void Importing(IdentityPart part, ContentManagement.Handlers.ImportContentContext context) {
+            var identity = context.Attribute(part.PartDefinition.Name, "Identifier");
+            if (identity != null) {
+                part.Identifier = identity;
+            }
+        }
+
+        protected override void Exporting(IdentityPart part, ContentManagement.Handlers.ExportContentContext context) {
+            context.Element(part.PartDefinition.Name).SetAttributeValue("Identifier", part.Identifier);
+        }
+    }
+}

src/Orchard.Web/Core/Common/Handlers/IdentityPartHandler.cs

@@ -0,0 +1,28 @@
+using System;
+using JetBrains.Annotations;
+using Orchard.ContentManagement;
+using Orchard.Core.Common.Models;
+using Orchard.Data;
+using Orchard.ContentManagement.Handlers;
+
+namespace Orchard.Core.Common.Handlers {
+    [UsedImplicitly]
+    public class IdentityPartHandler : ContentHandler {
+        public IdentityPartHandler(IRepository<IdentityPartRecord> identityRepository) {
+            Filters.Add(StorageFilter.For(identityRepository));
+            OnInitializing<IdentityPart>(AssignIdentity);
+        }
+
+        protected void AssignIdentity(InitializingContentContext context, IdentityPart part) {
+            part.Identifier = Guid.NewGuid().ToString("n");
+        }
+
+        protected override void GetItemMetadata(GetContentItemMetadataContext context) {
+            var part = context.ContentItem.As<IdentityPart>();
+
+            if (part != null) {
+                context.Metadata.Identity.Add("Identifier", part.Identifier);
+            }
+        }
+    }
+}

src/Orchard.Web/Core/Common/Migrations.cs

@@ -36,5 +36,16 @@ namespace Orchard.Core.Common {
 
             return 1;
         }
+
+        public int UpdateFrom1() {
+            SchemaBuilder.CreateTable("IdentityPartRecord",
+                table => table
+                    .ContentPartRecord()
+                    .Column<string>("Identifier", column => column.Unlimited())
+                );
+            ContentDefinitionManager.AlterPartDefinition("IdentityPart", builder => builder.Attachable());
+
+            return 2;
+        }
     }
 }

src/Orchard.Web/Core/Common/Models/IdentityPart.cs

@@ -0,0 +1,10 @@
+using Orchard.ContentManagement;
+
+namespace Orchard.Core.Common.Models {
+    public class IdentityPart : ContentPart<IdentityPartRecord> {
+        public string Identifier {
+            get { return Record.Identifier; }
+            set { Record.Identifier = value; }
+        }
+    }
+}

src/Orchard.Web/Core/Common/Models/IdentityPartRecord.cs

@@ -0,0 +1,7 @@
+using Orchard.ContentManagement.Records;
+
+namespace Orchard.Core.Common.Models {
+    public class IdentityPartRecord : ContentPartRecord {
+        public virtual string Identifier { get; set; }
+    }
+}

src/Orchard.Web/Core/Orchard.Core.csproj

@@ -61,7 +61,11 @@
     <Reference Include="System.Xml.Linq" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Common\Drivers\IdentityPartDriver.cs" />
+    <Compile Include="Common\Handlers\IdentityPartHandler.cs" />
     <Compile Include="Common\Models\CommonPartVersionRecord.cs" />
+    <Compile Include="Common\Models\IdentityPartRecord.cs" />
+    <Compile Include="Common\Models\IdentityPart.cs" />
     <Compile Include="Common\Services\XmlRpcHandler.cs" />
     <Compile Include="Containers\Controllers\ItemController.cs" />
     <Compile Include="Containers\Drivers\ContainablePartDriver.cs" />