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//-----------------------------------------------------------------------
// <copyright file="AccessTokenBindingElement.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.OAuth2.ChannelElements {
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using DotNetOpenAuth.Messaging;
using DotNetOpenAuth.OAuth2.Messages;
/// <summary>
/// Serializes access tokens inside an outgoing message.
/// </summary>
internal class AccessTokenBindingElement : AuthServerBindingElementBase {
/// <summary>
/// Initializes a new instance of the <see cref="AccessTokenBindingElement"/> class.
/// </summary>
internal AccessTokenBindingElement() {
}
/// <summary>
/// Gets the protection commonly offered (if any) by this binding element.
/// </summary>
/// <value>Always <c>MessageProtections.None</c></value>
/// <remarks>
/// This value is used to assist in sorting binding elements in the channel stack.
/// </remarks>
public override 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>
public override MessageProtections? ProcessOutgoingMessage(IProtocolMessage message) {
var directResponse = message as IDirectResponseProtocolMessage;
var request = directResponse != null ? directResponse.OriginatingRequest as IAccessTokenRequestInternal : null;
if (request != null) {
request.AccessTokenCreationParameters = this.AuthorizationServer.GetAccessTokenParameters(request);
ErrorUtilities.VerifyHost(request.AccessTokenCreationParameters != null, "IAuthorizationServer.GetAccessTokenParameters must not return null.");
}
var implicitGrantResponse = message as EndUserAuthorizationSuccessAccessTokenResponse;
if (implicitGrantResponse != null) {
IAccessTokenCarryingRequest tokenCarryingResponse = implicitGrantResponse;
tokenCarryingResponse.AuthorizationDescription = new AccessToken(request.ClientIdentifier, implicitGrantResponse.Scope, implicitGrantResponse.AuthorizingUsername, implicitGrantResponse.Lifetime);
return MessageProtections.None;
}
var accessTokenResponse = message as AccessTokenSuccessResponse;
if (accessTokenResponse != null) {
var accessTokenRequest = request as IAccessTokenRequestInternal;
ErrorUtilities.VerifyInternal(accessTokenRequest != null, MessagingStrings.UnexpectedMessageReceived, typeof(IAccessTokenRequestInternal), request.GetType());
var authCarryingRequest = (IAuthorizationCarryingRequest)request;
var accessToken = new AccessToken(authCarryingRequest.AuthorizationDescription, accessTokenResponse.Lifetime);
var accessTokenFormatter = AccessToken.CreateFormatter(this.AuthorizationServer.AccessTokenSigningKey, accessTokenRequest.AccessTokenCreationParameters.ResourceServerEncryptionKey);
accessTokenResponse.AccessToken = accessTokenFormatter.Serialize(accessToken);
if (accessTokenResponse.HasRefreshToken) {
var refreshToken = new RefreshToken(authCarryingRequest.AuthorizationDescription);
var refreshTokenFormatter = RefreshToken.CreateFormatter(this.AuthorizationServer.CryptoKeyStore);
accessTokenResponse.RefreshToken = refreshTokenFormatter.Serialize(refreshToken);
}
}
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>
public override MessageProtections? ProcessIncomingMessage(IProtocolMessage message) {
return null;
}
}
}
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