1 files changed, 101 insertions, 0 deletions
diff --git a/src/DotNetOpenAuth.OAuth2/OAuth2/ChannelElements/AuthorizationCodeBindingElement.cs b/src/DotNetOpenAuth.OAuth2/OAuth2/ChannelElements/AuthorizationCodeBindingElement.cs
new file mode 100644
index 0000000..b0e6203
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+++ b/src/DotNetOpenAuth.OAuth2/OAuth2/ChannelElements/AuthorizationCodeBindingElement.cs
@@ -0,0 +1,101 @@
+//-----------------------------------------------------------------------
+// <copyright file="AuthorizationCodeBindingElement.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.OAuth2.ChannelElements {
+	using System;
+	using System.Collections.Generic;
+	using System.Linq;
+	using System.Text;
+	using Messages;
+	using Messaging;
+	using Messaging.Bindings;
+
+	/// <summary>
+	/// A binding element for OAuth 2.0 authorization servers that create/verify
+	/// issued authorization codes as part of obtaining access/refresh tokens.
+	/// </summary>
+	internal class AuthorizationCodeBindingElement : AuthServerBindingElementBase {
+		/// <summary>
+		/// Initializes a new instance of the <see cref="AuthorizationCodeBindingElement"/> class.
+		/// </summary>
+		internal AuthorizationCodeBindingElement() {
+		}
+
+		/// <summary>
+		/// Gets the protection commonly offered (if any) by this binding element.
+		/// </summary>
+		/// <value>Always <c>MessageProtections.None</c></value>
+		/// <remarks>
+		/// This value is used to assist in sorting binding elements in the channel stack.
+		/// </remarks>
+		public override MessageProtections Protection {
+			get { return MessageProtections.None; }
+		}
+
+		/// <summary>
+		/// Gets the maximum message age from the standard expiration binding element.
+		/// </summary>
+		/// <value>This interval need not account for clock skew because it is only compared within a single authorization server or farm of servers.</value>
+		internal static TimeSpan MaximumMessageAge {
+			get { return Configuration.DotNetOpenAuthSection.Messaging.MaximumMessageLifetimeNoSkew; }
+		}
+
+		/// <summary>
+		/// Prepares a message for sending based on the rules of this channel binding element.
+		/// </summary>
+		/// <param name="message">The message to prepare for sending.</param>
+		/// <returns>
+		/// The protections (if any) that this binding element applied to the message.
+		/// Null if this binding element did not even apply to this binding element.
+		/// </returns>
+		/// <remarks>
+		/// Implementations that provide message protection must honor the
+		/// <see cref="MessagePartAttribute.RequiredProtection"/> properties where applicable.
+		/// </remarks>
+		public override MessageProtections? ProcessOutgoingMessage(IProtocolMessage message) {
+			var response = message as EndUserAuthorizationSuccessAuthCodeResponse;
+			if (response != null) {
+				var directResponse = (IDirectResponseProtocolMessage)response;
+				var request = (EndUserAuthorizationRequest)directResponse.OriginatingRequest;
+				IAuthorizationCarryingRequest tokenCarryingResponse = response;
+				tokenCarryingResponse.AuthorizationDescription = new AuthorizationCode(request.ClientIdentifier, request.Callback, response.Scope, response.AuthorizingUsername);
+
+				return MessageProtections.None;
+			}
+
+			return null;
+		}
+
+		/// <summary>
+		/// Performs any transformation on an incoming message that may be necessary and/or
+		/// validates an incoming message based on the rules of this channel binding element.
+		/// </summary>
+		/// <param name="message">The incoming message to process.</param>
+		/// <returns>
+		/// The protections (if any) that this binding element applied to the message.
+		/// Null if this binding element did not even apply to this binding element.
+		/// </returns>
+		/// <exception cref="ProtocolException">
+		/// Thrown when the binding element rules indicate that this message is invalid and should
+		/// NOT be processed.
+		/// </exception>
+		/// <remarks>
+		/// Implementations that provide message protection must honor the
+		/// <see cref="MessagePartAttribute.RequiredProtection"/> properties where applicable.
+		/// </remarks>
+		public override MessageProtections? ProcessIncomingMessage(IProtocolMessage message) {
+			var request = message as AccessTokenAuthorizationCodeRequest;
+			if (request != null) {
+				IAuthorizationCarryingRequest tokenRequest = request;
+				((AuthorizationCode)tokenRequest.AuthorizationDescription).VerifyCallback(request.Callback);
+
+				return MessageProtections.None;
+			}
+
+			return null;
+		}
+	}
+}