1 files changed, 40 insertions, 0 deletions
diff --git a/src/DotNetOpenAuth.Messaging/Messaging/IMessageOriginalPayload.cs b/src/DotNetOpenAuth.Messaging/Messaging/IMessageOriginalPayload.cs
new file mode 100644
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+++ b/src/DotNetOpenAuth.Messaging/Messaging/IMessageOriginalPayload.cs
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+//-----------------------------------------------------------------------
+// <copyright file="IMessageOriginalPayload.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.Messaging {
+	using System;
+	using System.Collections.Generic;
+	using System.Diagnostics.CodeAnalysis;
+	using System.Diagnostics.Contracts;
+	using System.Text;
+
+	/// <summary>
+	/// An interface that appears on messages that need to retain a description of
+	/// what their literal payload was when they were deserialized.
+	/// </summary>
+	[ContractClass(typeof(IMessageOriginalPayloadContract))]
+	public interface IMessageOriginalPayload {
+		/// <summary>
+		/// Gets or sets the original message parts, before any normalization or default values were assigned.
+		/// </summary>
+		[SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly", Justification = "By design")]
+		IDictionary<string, string> OriginalPayload { get; set; }
+	}
+
+	/// <summary>
+	/// Code contract for the <see cref="IMessageOriginalPayload"/> interface.
+	/// </summary>
+	[ContractClassFor(typeof(IMessageOriginalPayload))]
+	internal abstract class IMessageOriginalPayloadContract : IMessageOriginalPayload {
+		/// <summary>
+		/// Gets or sets the original message parts, before any normalization or default values were assigned.
+		/// </summary>
+		IDictionary<string, string> IMessageOriginalPayload.OriginalPayload {
+			get { throw new NotImplementedException(); }
+			set { throw new NotImplementedException(); }
+		}
+	}
+}