1 files changed, 113 insertions, 0 deletions
diff --git a/src/DotNetOpenAuth.OpenId/OpenId/Messages/IndirectResponseBase.cs b/src/DotNetOpenAuth.OpenId/OpenId/Messages/IndirectResponseBase.cs
new file mode 100644
index 0000000..fce6028
--- /dev/null
+++ b/src/DotNetOpenAuth.OpenId/OpenId/Messages/IndirectResponseBase.cs
@@ -0,0 +1,113 @@
+//-----------------------------------------------------------------------
+// <copyright file="IndirectResponseBase.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.OpenId.Messages {
+	using System;
+	using System.Collections.Generic;
+	using System.Diagnostics.Contracts;
+	using System.Linq;
+	using System.Text;
+	using DotNetOpenAuth.Messaging;
+
+	/// <summary>
+	/// A common base class from which indirect response messages should derive.
+	/// </summary>
+	[Serializable]
+	internal class IndirectResponseBase : RequestBase, IProtocolMessageWithExtensions {
+		/// <summary>
+		/// Backing store for the <see cref="Extensions"/> property.
+		/// </summary>
+		private IList<IExtensionMessage> extensions = new List<IExtensionMessage>();
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="IndirectResponseBase"/> class.
+		/// </summary>
+		/// <param name="request">The request that caused this response message to be constructed.</param>
+		/// <param name="mode">The value of the openid.mode parameter.</param>
+		protected IndirectResponseBase(SignedResponseRequest request, string mode)
+			: base(GetVersion(request), GetReturnTo(request), mode, MessageTransport.Indirect) {
+			Contract.Requires<ArgumentNullException>(request != null);
+
+			this.OriginatingRequest = request;
+		}
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="IndirectResponseBase"/> class
+		/// for unsolicited assertion scenarios.
+		/// </summary>
+		/// <param name="version">The OpenID version supported at the Relying Party.</param>
+		/// <param name="relyingPartyReturnTo">
+		/// The URI at which the Relying Party receives OpenID indirect messages.
+		/// </param>
+		/// <param name="mode">The value to use for the openid.mode parameter.</param>
+		protected IndirectResponseBase(Version version, Uri relyingPartyReturnTo, string mode)
+			: base(version, relyingPartyReturnTo, mode, MessageTransport.Indirect) {
+		}
+
+		#region IProtocolMessageWithExtensions Members
+
+		/// <summary>
+		/// Gets the list of extensions that are included with this message.
+		/// </summary>
+		/// <value></value>
+		/// <remarks>
+		/// Implementations of this interface should ensure that this property never returns null.
+		/// </remarks>
+		public IList<IExtensionMessage> Extensions {
+			get { return this.extensions; }
+		}
+
+		#endregion
+
+		/// <summary>
+		/// Gets the signed extensions on this message.
+		/// </summary>
+		internal IEnumerable<IOpenIdMessageExtension> SignedExtensions {
+			get { return this.extensions.OfType<IOpenIdMessageExtension>().Where(ext => ext.IsSignedByRemoteParty); }
+		}
+
+		/// <summary>
+		/// Gets the unsigned extensions on this message.
+		/// </summary>
+		internal IEnumerable<IOpenIdMessageExtension> UnsignedExtensions {
+			get { return this.extensions.OfType<IOpenIdMessageExtension>().Where(ext => !ext.IsSignedByRemoteParty); }
+		}
+
+		/// <summary>
+		/// Gets the originating request message, if applicable.
+		/// </summary>
+		protected SignedResponseRequest OriginatingRequest { get; private set; }
+
+		/// <summary>
+		/// Gets the <see cref="IMessage.Version"/> property of a message.
+		/// </summary>
+		/// <param name="message">The message to fetch the protocol version from.</param>
+		/// <returns>The value of the <see cref="IMessage.Version"/> property.</returns>
+		/// <remarks>
+		/// This method can be used by a constructor to throw an <see cref="ArgumentNullException"/>
+		/// instead of a <see cref="NullReferenceException"/>.
+		/// </remarks>
+		internal static Version GetVersion(IProtocolMessage message) {
+			Contract.Requires<ArgumentNullException>(message != null);
+			return message.Version;
+		}
+
+		/// <summary>
+		/// Gets the <see cref="SignedResponseRequest.ReturnTo"/> property of a message.
+		/// </summary>
+		/// <param name="message">The message to fetch the ReturnTo from.</param>
+		/// <returns>The value of the <see cref="SignedResponseRequest.ReturnTo"/> property.</returns>
+		/// <remarks>
+		/// This method can be used by a constructor to throw an <see cref="ArgumentNullException"/>
+		/// instead of a <see cref="NullReferenceException"/>.
+		/// </remarks>
+		private static Uri GetReturnTo(SignedResponseRequest message) {
+			Contract.Requires<ArgumentNullException>(message != null);
+			ErrorUtilities.VerifyProtocol(message.ReturnTo != null, OpenIdStrings.ReturnToRequiredForResponse);
+			return message.ReturnTo;
+		}
+	}
+}