1 files changed, 21 insertions, 0 deletions
diff --git a/src/DotNetOpenAuth.OAuth2/OAuth2/Messages/IMessageWithClientState.cs b/src/DotNetOpenAuth.OAuth2/OAuth2/Messages/IMessageWithClientState.cs
new file mode 100644
index 0000000..fa371ae
--- /dev/null
+++ b/src/DotNetOpenAuth.OAuth2/OAuth2/Messages/IMessageWithClientState.cs
@@ -0,0 +1,21 @@
+//-----------------------------------------------------------------------
+// <copyright file="IMessageWithClientState.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.OAuth2.Messages {
+	using DotNetOpenAuth.Messaging;
+
+	/// <summary>
+	/// A message carrying client state the authorization server should preserve on behalf of the client
+	/// during an authorization.
+	/// </summary>
+	internal interface IMessageWithClientState : IProtocolMessage {
+		/// <summary>
+		/// Gets or sets the state of the client.
+		/// </summary>
+		/// <value>The state of the client.</value>
+		string ClientState { get; set; }
+	}
+}