1 files changed, 53 insertions, 0 deletions
diff --git a/src/DotNetOpenAuth.OAuth2/OAuth2/IClientAuthorizationTracker.cs b/src/DotNetOpenAuth.OAuth2/OAuth2/IClientAuthorizationTracker.cs
new file mode 100644
index 0000000..4529cef
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+++ b/src/DotNetOpenAuth.OAuth2/OAuth2/IClientAuthorizationTracker.cs
@@ -0,0 +1,53 @@
+//-----------------------------------------------------------------------
+// <copyright file="IClientAuthorizationTracker.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.OAuth2 {
+	using System;
+	using System.Diagnostics.Contracts;
+
+	/// <summary>
+	/// A token manager implemented by some clients to assist in tracking authorization state.
+	/// </summary>
+	[ContractClass(typeof(IClientAuthorizationTrackerContract))]
+	public interface IClientAuthorizationTracker {
+		/// <summary>
+		/// Gets the state of the authorization for a given callback URL and client state.
+		/// </summary>
+		/// <param name="callbackUrl">The callback URL.</param>
+		/// <param name="clientState">State of the client stored at the beginning of an authorization request.</param>
+		/// <returns>The authorization state; may be <c>null</c> if no authorization state matches.</returns>
+		IAuthorizationState GetAuthorizationState(Uri callbackUrl, string clientState);
+	}
+
+	/// <summary>
+	/// Contract class for the <see cref="IClientAuthorizationTracker"/> interface.
+	/// </summary>
+	[ContractClassFor(typeof(IClientAuthorizationTracker))]
+	internal abstract class IClientAuthorizationTrackerContract : IClientAuthorizationTracker {
+		/// <summary>
+		/// Prevents a default instance of the <see cref="IClientAuthorizationTrackerContract"/> class from being created.
+		/// </summary>
+		private IClientAuthorizationTrackerContract() {
+		}
+
+		#region IClientTokenManager Members
+
+		/// <summary>
+		/// Gets the state of the authorization for a given callback URL and client state.
+		/// </summary>
+		/// <param name="callbackUrl">The callback URL.</param>
+		/// <param name="clientState">State of the client stored at the beginning of an authorization request.</param>
+		/// <returns>
+		/// The authorization state; may be <c>null</c> if no authorization state matches.
+		/// </returns>
+		IAuthorizationState IClientAuthorizationTracker.GetAuthorizationState(Uri callbackUrl, string clientState) {
+			Requires.NotNull(callbackUrl, "callbackUrl");
+			throw new NotImplementedException();
+		}
+
+		#endregion
+	}
+}