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//-----------------------------------------------------------------------
// <copyright file="WebAppAccessTokenRequestVerifier.cs" company="Andrew Arnott">
// Copyright (c) Andrew Arnott. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
using DotNetOpenAuth.Messaging.Bindings;
namespace DotNetOpenAuth.OAuthWrap.ChannelElements {
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Messages;
using Messaging;
internal class WebAppAccessTokenRequestVerifier : IChannelBindingElement {
private const string VerificationCodeContext = "{VerificationCode}";
/// <summary>
/// Initializes a new instance of the <see cref="WebAppAccessTokenRequestVerifier"/> class.
/// </summary>
internal WebAppAccessTokenRequestVerifier() {
}
/// <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>
/// <value>Always <c>MessageProtections.None</c></value>
/// <remarks>
/// This value is used to assist in sorting binding elements in the channel stack.
/// </remarks>
public MessageProtections Protection {
get { return MessageProtections.None; }
}
protected OAuthWrapAuthorizationServerChannel OAuthChannel {
get { return (OAuthWrapAuthorizationServerChannel)this.Channel; }
}
/// <summary>
/// Gets the maximum message age from the standard expiration binding element.
/// </summary>
private static TimeSpan MaximumMessageAge {
get { return StandardExpirationBindingElement.MaximumMessageAge; }
}
/// <summary>
/// Gets the authorization server hosting this channel.
/// </summary>
/// <value>The authorization server.</value>
private IAuthorizationServer AuthorizationServer {
get { return this.OAuthChannel.AuthorizationServer; }
}
/// <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) {
var response = message as WebAppSuccessResponse;
if (response != null) {
var directResponse = response as IDirectResponseProtocolMessage;
var request = directResponse.OriginatingRequest as WebAppRequest;
var code = new VerificationCode(this.OAuthChannel, request.Callback, request.Scope);
response.VerificationCode = code.Encode();
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) {
var request = message as WebAppAccessTokenRequest;
if (request != null) {
var client = this.AuthorizationServer.GetClient(request.ClientIdentifier);
ErrorUtilities.VerifyProtocol(string.Equals(client.Secret, request.ClientSecret, StringComparison.Ordinal), Protocol.incorrect_client_credentials);
var verificationCode = VerificationCode.Decode(this.OAuthChannel, request.VerificationCode);
verificationCode.VerifyCallback(request.Callback);
// Has this verification code expired?
DateTime expirationDate = verificationCode.CreationDateUtc + MaximumMessageAge;
if (expirationDate < DateTime.UtcNow) {
throw new ExpiredMessageException(expirationDate, message);
}
// Has this verification code already been used to obtain an access/refresh token?
if (!this.AuthorizationServer.VerificationCodeNonceStore.StoreNonce(VerificationCodeContext, verificationCode.Nonce, verificationCode.CreationDateUtc)) {
Logger.OpenId.ErrorFormat("Replayed nonce detected ({0} {1}). Rejecting message.", verificationCode.Nonce, verificationCode.CreationDateUtc);
throw new ReplayedMessageException(message);
}
return MessageProtections.None;
}
return null;
}
}
}
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