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//-----------------------------------------------------------------------
// <copyright file="SigningBindingElementChain.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.OAuth.ChannelElements {
using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.Linq;
using System.Text;
using DotNetOpenAuth.Messaging;
/// <summary>
/// A tamper protection applying binding element that can use any of several given
/// binding elements to apply the protection.
/// </summary>
internal class SigningBindingElementChain : ITamperProtectionChannelBindingElement {
/// <summary>
/// The various signing binding elements that may be applicable to a message in preferred use order.
/// </summary>
private readonly ITamperProtectionChannelBindingElement[] signers;
/// <summary>
/// Initializes a new instance of the <see cref="SigningBindingElementChain"/> class.
/// </summary>
/// <param name="signers">
/// The signing binding elements that may be used for some outgoing message,
/// in preferred use order.
/// </param>
internal SigningBindingElementChain(ITamperProtectionChannelBindingElement[] signers) {
Requires.NotNullOrEmpty(signers, "signers");
Requires.NullOrWithNoNullElements(signers, "signers");
Requires.True(signers.Select(s => s.Protection).Distinct().Count() == 1, "signers", OAuthStrings.SigningElementsMustShareSameProtection);
this.signers = signers;
}
#region ITamperProtectionChannelBindingElement Properties
/// <summary>
/// Gets or sets the delegate that will initialize the non-serialized properties necessary on a signed
/// message so that its signature can be correctly calculated for verification.
/// May be null for Consumers (who never have to verify signatures).
/// </summary>
public Action<ITamperResistantOAuthMessage> SignatureCallback {
get {
return this.signers[0].SignatureCallback;
}
set {
foreach (ITamperProtectionChannelBindingElement signer in this.signers) {
signer.SignatureCallback = value;
}
}
}
#endregion
#region IChannelBindingElement Members
/// <summary>
/// Gets the protection offered (if any) by this binding element.
/// </summary>
public MessageProtections Protection {
get { return this.signers[0].Protection; }
}
/// <summary>
/// Gets or sets the channel that this binding element belongs to.
/// </summary>
public Channel Channel {
get {
return this.signers[0].Channel;
}
set {
foreach (var signer in this.signers) {
signer.Channel = value;
}
}
}
/// <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>
public MessageProtections? ProcessOutgoingMessage(IProtocolMessage message) {
foreach (IChannelBindingElement signer in this.signers) {
ErrorUtilities.VerifyInternal(signer.Channel != null, "A binding element's Channel property is unexpectedly null.");
MessageProtections? result = signer.ProcessOutgoingMessage(message);
if (result.HasValue) {
return result;
}
}
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>
public MessageProtections? ProcessIncomingMessage(IProtocolMessage message) {
foreach (IChannelBindingElement signer in this.signers) {
ErrorUtilities.VerifyInternal(signer.Channel != null, "A binding element's Channel property is unexpectedly null.");
MessageProtections? result = signer.ProcessIncomingMessage(message);
if (result.HasValue) {
return result;
}
}
return null;
}
#endregion
#region ITamperProtectionChannelBindingElement Methods
/// <summary>
/// Creates a new object that is a copy of the current instance.
/// </summary>
/// <returns>
/// A new object that is a copy of this instance.
/// </returns>
ITamperProtectionChannelBindingElement ITamperProtectionChannelBindingElement.Clone() {
return new SigningBindingElementChain(this.signers.Select(el => (ITamperProtectionChannelBindingElement)el.Clone()).ToArray());
}
#endregion
}
}
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