First pass at dividing DotNetOpenAuth features into separate assemblies.

Nothing compiles at this point.

1 files changed, 129 insertions, 0 deletions

diff --git a/src/DotNetOpenAuth.OpenId/OpenId/ChannelElements/BackwardCompatibilityBindingElement.cs b/src/DotNetOpenAuth.OpenId/OpenId/ChannelElements/BackwardCompatibilityBindingElement.cs
new file mode 100644
index 0000000..b730b1f
--- /dev/null
+++ b/src/DotNetOpenAuth.OpenId/OpenId/ChannelElements/BackwardCompatibilityBindingElement.cs
@@ -0,0 +1,129 @@
+//-----------------------------------------------------------------------
+// <copyright file="BackwardCompatibilityBindingElement.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.OpenId.ChannelElements {
+	using System;
+	using DotNetOpenAuth.Messaging;
+	using DotNetOpenAuth.Messaging.Reflection;
+	using DotNetOpenAuth.OpenId.Messages;
+
+	/// <summary>
+	/// Provides a mechanism for Relying Parties to work with OpenID 1.0 Providers
+	/// without losing claimed_id and op_endpoint data, which OpenID 2.0 Providers
+	/// are required to send back with positive assertions.
+	/// </summary>
+	internal class BackwardCompatibilityBindingElement : IChannelBindingElement {
+		/// <summary>
+		/// The "dnoa.op_endpoint" callback parameter that stores the Provider Endpoint URL
+		/// to tack onto the return_to URI.
+		/// </summary>
+		private const string ProviderEndpointParameterName = OpenIdUtilities.CustomParameterPrefix + "op_endpoint";
+
+		/// <summary>
+		/// The "dnoa.claimed_id" callback parameter that stores the Claimed Identifier
+		/// to tack onto the return_to URI.
+		/// </summary>
+		private const string ClaimedIdentifierParameterName = OpenIdUtilities.CustomParameterPrefix + "claimed_id";
+
+		#region IChannelBindingElement Members
+
+		/// <summary>
+		/// Gets or sets the channel that this binding element belongs to.
+		/// </summary>
+		/// <value></value>
+		/// <remarks>
+		/// This property is set by the channel when it is first constructed.
+		/// </remarks>
+		public Channel Channel { get; set; }
+
+		/// <summary>
+		/// Gets the protection offered (if any) by this binding element.
+		/// </summary>
+		/// <value><see cref="MessageProtections.None"/></value>
+		public MessageProtections Protection {
+			get { return MessageProtections.None; }
+		}
+
+		/// <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 MessageProtections? ProcessOutgoingMessage(IProtocolMessage message) {
+			SignedResponseRequest request = message as SignedResponseRequest;
+			if (request != null && request.Version.Major < 2) {
+				request.AddReturnToArguments(ProviderEndpointParameterName, request.Recipient.AbsoluteUri);
+
+				CheckIdRequest authRequest = request as CheckIdRequest;
+				if (authRequest != null) {
+					request.AddReturnToArguments(ClaimedIdentifierParameterName, authRequest.ClaimedIdentifier);
+				}
+
+				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 MessageProtections? ProcessIncomingMessage(IProtocolMessage message) {
+			IndirectSignedResponse response = message as IndirectSignedResponse;
+			if (response != null && response.Version.Major < 2) {
+				// GetReturnToArgument may return parameters that are not signed,
+				// but we must allow for that since in OpenID 1.x, a stateless RP has 
+				// no way to preserve the provider endpoint and claimed identifier otherwise.  
+				// We'll verify the positive assertion later in the 
+				// RelyingParty.PositiveAuthenticationResponse constructor anyway.
+				// If this is a 1.0 OP signed response without these parameters then we didn't initiate
+				// the request ,and since 1.0 OPs are not supposed to be able to send unsolicited 
+				// assertions it's an invalid case that we throw an exception for.
+				if (response.ProviderEndpoint == null) {
+					string op_endpoint = response.GetReturnToArgument(ProviderEndpointParameterName);
+					ErrorUtilities.VerifyProtocol(op_endpoint != null, MessagingStrings.RequiredParametersMissing, message.GetType().Name, ProviderEndpointParameterName);
+					response.ProviderEndpoint = new Uri(op_endpoint);
+				}
+
+				PositiveAssertionResponse authResponse = response as PositiveAssertionResponse;
+				if (authResponse != null) {
+					if (authResponse.ClaimedIdentifier == null) {
+						string claimedId = response.GetReturnToArgument(ClaimedIdentifierParameterName);
+						ErrorUtilities.VerifyProtocol(claimedId != null, MessagingStrings.RequiredParametersMissing, message.GetType().Name, ClaimedIdentifierParameterName);
+						authResponse.ClaimedIdentifier = claimedId;
+					}
+				}
+
+				return MessageProtections.None;
+			}
+
+			return null;
+		}
+
+		#endregion
+	}
+}