1 files changed, 120 insertions, 0 deletions
diff --git a/src/DotNetOpenAuth.OpenId.RelyingParty/OpenId/ChannelElements/OpenIdRelyingPartyChannel.cs b/src/DotNetOpenAuth.OpenId.RelyingParty/OpenId/ChannelElements/OpenIdRelyingPartyChannel.cs
new file mode 100644
index 0000000..4739d84
--- /dev/null
+++ b/src/DotNetOpenAuth.OpenId.RelyingParty/OpenId/ChannelElements/OpenIdRelyingPartyChannel.cs
@@ -0,0 +1,120 @@
+//-----------------------------------------------------------------------
+// <copyright file="OpenIdRelyingPartyChannel.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.OpenId.ChannelElements {
+	using System;
+	using System.Collections.Generic;
+	using System.Diagnostics.Contracts;
+	using System.Linq;
+	using System.Text;
+	using DotNetOpenAuth.Messaging;
+	using DotNetOpenAuth.Messaging.Bindings;
+	using DotNetOpenAuth.OpenId.Extensions;
+	using DotNetOpenAuth.OpenId.RelyingParty;
+
+	/// <summary>
+	/// The messaging channel for OpenID relying parties.
+	/// </summary>
+	internal class OpenIdRelyingPartyChannel : OpenIdChannel {
+		/// <summary>
+		/// Initializes a new instance of the <see cref="OpenIdRelyingPartyChannel"/> class.
+		/// </summary>
+		/// <param name="cryptoKeyStore">The association store to use.</param>
+		/// <param name="nonceStore">The nonce store to use.</param>
+		/// <param name="securitySettings">The security settings to apply.</param>
+		internal OpenIdRelyingPartyChannel(ICryptoKeyStore cryptoKeyStore, INonceStore nonceStore, RelyingPartySecuritySettings securitySettings)
+			: this(cryptoKeyStore, nonceStore, new OpenIdRelyingPartyMessageFactory(), securitySettings, false) {
+			Requires.NotNull(securitySettings, "securitySettings");
+		}
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="OpenIdRelyingPartyChannel"/> class.
+		/// </summary>
+		/// <param name="cryptoKeyStore">The association store to use.</param>
+		/// <param name="nonceStore">The nonce store to use.</param>
+		/// <param name="messageTypeProvider">An object that knows how to distinguish the various OpenID message types for deserialization purposes.</param>
+		/// <param name="securitySettings">The security settings to apply.</param>
+		/// <param name="nonVerifying">A value indicating whether the channel is set up with no functional security binding elements.</param>
+		private OpenIdRelyingPartyChannel(ICryptoKeyStore cryptoKeyStore, INonceStore nonceStore, IMessageFactory messageTypeProvider, RelyingPartySecuritySettings securitySettings, bool nonVerifying) :
+			base(messageTypeProvider, InitializeBindingElements(cryptoKeyStore, nonceStore, securitySettings, nonVerifying)) {
+			Requires.NotNull(messageTypeProvider, "messageTypeProvider");
+			Requires.NotNull(securitySettings, "securitySettings");
+			Requires.True(!nonVerifying || securitySettings is RelyingPartySecuritySettings);
+		}
+
+		/// <summary>
+		/// A value indicating whether the channel is set up
+		/// with no functional security binding elements.
+		/// </summary>
+		/// <returns>A new <see cref="OpenIdChannel"/> instance that will not perform verification on incoming messages or apply any security to outgoing messages.</returns>
+		/// <remarks>
+		/// 	<para>A value of <c>true</c> allows the relying party to preview incoming
+		/// messages without invalidating nonces or checking signatures.</para>
+		/// 	<para>Setting this to <c>true</c> poses a great security risk and is only
+		/// present to support the OpenIdAjaxTextBox which needs to preview
+		/// messages, and will validate them later.</para>
+		/// </remarks>
+		internal static OpenIdChannel CreateNonVerifyingChannel() {
+			Contract.Ensures(Contract.Result<OpenIdChannel>() != null);
+
+			return new OpenIdRelyingPartyChannel(null, null, new OpenIdRelyingPartyMessageFactory(), new RelyingPartySecuritySettings(), true);
+		}
+
+		/// <summary>
+		/// Initializes the binding elements.
+		/// </summary>
+		/// <param name="cryptoKeyStore">The crypto key store.</param>
+		/// <param name="nonceStore">The nonce store to use.</param>
+		/// <param name="securitySettings">The security settings to apply.  Must be an instance of either <see cref="RelyingPartySecuritySettings"/> or ProviderSecuritySettings.</param>
+		/// <param name="nonVerifying">A value indicating whether the channel is set up with no functional security binding elements.</param>
+		/// <returns>
+		/// An array of binding elements which may be used to construct the channel.
+		/// </returns>
+		private static IChannelBindingElement[] InitializeBindingElements(ICryptoKeyStore cryptoKeyStore, INonceStore nonceStore, RelyingPartySecuritySettings securitySettings, bool nonVerifying) {
+			Requires.NotNull(securitySettings, "securitySettings");
+
+			SigningBindingElement signingElement;
+			signingElement = nonVerifying ? null : new RelyingPartySigningBindingElement(new CryptoKeyStoreAsRelyingPartyAssociationStore(cryptoKeyStore ?? new MemoryCryptoKeyStore()));
+
+			var extensionFactory = OpenIdExtensionFactoryAggregator.LoadFromConfiguration();
+
+			List<IChannelBindingElement> elements = new List<IChannelBindingElement>(8);
+			elements.Add(new ExtensionsBindingElementRelyingParty(extensionFactory, securitySettings));
+			elements.Add(new RelyingPartySecurityOptions(securitySettings));
+			elements.Add(new BackwardCompatibilityBindingElement());
+			ReturnToNonceBindingElement requestNonceElement = null;
+
+			if (cryptoKeyStore != null) {
+				if (nonceStore != null) {
+					// There is no point in having a ReturnToNonceBindingElement without
+					// a ReturnToSignatureBindingElement because the nonce could be
+					// artificially changed without it.
+					requestNonceElement = new ReturnToNonceBindingElement(nonceStore, securitySettings);
+					elements.Add(requestNonceElement);
+				}
+
+				// It is important that the return_to signing element comes last
+				// so that the nonce is included in the signature.
+				elements.Add(new ReturnToSignatureBindingElement(cryptoKeyStore));
+			}
+
+			ErrorUtilities.VerifyOperation(!securitySettings.RejectUnsolicitedAssertions || requestNonceElement != null, OpenIdStrings.UnsolicitedAssertionRejectionRequiresNonceStore);
+
+			if (nonVerifying) {
+				elements.Add(new SkipSecurityBindingElement());
+			} else {
+				if (nonceStore != null) {
+					elements.Add(new StandardReplayProtectionBindingElement(nonceStore, true));
+				}
+
+				elements.Add(new StandardExpirationBindingElement());
+				elements.Add(signingElement);
+			}
+
+			return elements.ToArray();
+		}
+	}
+}