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//-----------------------------------------------------------------------
// <copyright file="TokenHandlingBindingElement.cs" company="Andrew Arnott">
// Copyright (c) Andrew Arnott. 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;
using DotNetOpenAuth.OAuth.Messages;
/// <summary>
/// A binding element for Service Providers to manage the
/// callbacks and verification codes on applicable messages.
/// </summary>
internal class TokenHandlingBindingElement : IChannelBindingElement {
/// <summary>
/// The token manager offered by the service provider.
/// </summary>
private IServiceProviderTokenManager tokenManager;
/// <summary>
/// Initializes a new instance of the <see cref="TokenHandlingBindingElement"/> class.
/// </summary>
/// <param name="tokenManager">The token manager.</param>
internal TokenHandlingBindingElement(IServiceProviderTokenManager tokenManager) {
Contract.Requires(tokenManager != null);
ErrorUtilities.VerifyArgumentNotNull(tokenManager, "tokenManager");
this.tokenManager = tokenManager;
}
#region IChannelBindingElement Members
/// <summary>
/// Gets or sets the channel that this binding element belongs to.
/// </summary>
/// <remarks>
/// This property is set by the channel when it is first constructed.
/// </remarks>
public Channel Channel { get; set; }
/// <summary>
/// Gets the protection commonly offered (if any) by this binding element.
/// </summary>
/// <remarks>
/// This value is used to assist in sorting binding elements in the channel stack.
/// </remarks>
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) {
ErrorUtilities.VerifyArgumentNotNull(message, "message");
var userAuthResponse = message as UserAuthorizationResponse;
if (userAuthResponse != null && userAuthResponse.Version >= Protocol.V10a.Version) {
this.tokenManager.GetRequestToken(userAuthResponse.RequestToken).VerificationCode = userAuthResponse.VerificationCode;
return MessageProtections.None;
}
// Hook to store the token and secret on its way down to the Consumer.
var grantRequestTokenResponse = message as UnauthorizedTokenResponse;
if (grantRequestTokenResponse != null) {
this.tokenManager.StoreNewRequestToken(grantRequestTokenResponse.RequestMessage, grantRequestTokenResponse);
this.tokenManager.GetRequestToken(grantRequestTokenResponse.RequestToken).ConsumerVersion = grantRequestTokenResponse.Version;
if (grantRequestTokenResponse.RequestMessage.Callback != null) {
this.tokenManager.GetRequestToken(grantRequestTokenResponse.RequestToken).Callback = grantRequestTokenResponse.RequestMessage.Callback;
}
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) {
ErrorUtilities.VerifyArgumentNotNull(message, "message");
var authorizedTokenRequest = message as AuthorizedTokenRequest;
if (authorizedTokenRequest != null && authorizedTokenRequest.Version >= Protocol.V10a.Version) {
string expectedVerifier = this.tokenManager.GetRequestToken(authorizedTokenRequest.RequestToken).VerificationCode;
ErrorUtilities.VerifyProtocol(string.Equals(authorizedTokenRequest.VerificationCode, expectedVerifier, StringComparison.Ordinal), OAuthStrings.IncorrectVerifier);
return MessageProtections.None;
}
return null;
}
#endregion
}
}
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