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//-----------------------------------------------------------------------
// <copyright file="OAuth2ChannelBase.cs" company="Andrew Arnott">
// Copyright (c) Andrew Arnott. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.OAuth2.ChannelElements {
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using DotNetOpenAuth.Messaging;
using DotNetOpenAuth.OAuth2.Messages;
/// <summary>
/// The base messaging channel used by OAuth 2.0 parties.
/// </summary>
internal abstract class OAuth2ChannelBase : StandardMessageFactoryChannel {
/// <summary>
/// The messages receivable by this channel.
/// </summary>
private static readonly Type[] MessageTypes = new Type[] {
typeof(AccessTokenRefreshRequest),
typeof(AccessTokenAuthorizationCodeRequest),
typeof(AccessTokenResourceOwnerPasswordCredentialsRequest),
typeof(AccessTokenClientCredentialsRequest),
typeof(AccessTokenSuccessResponse),
typeof(AccessTokenFailedResponse),
typeof(EndUserAuthorizationRequest),
typeof(EndUserAuthorizationSuccessAuthCodeResponse),
typeof(EndUserAuthorizationSuccessAccessTokenResponse),
typeof(EndUserAuthorizationFailedResponse),
typeof(UnauthorizedResponse),
};
/// <summary>
/// The protocol versions supported by this channel.
/// </summary>
private static readonly Version[] Versions = Protocol.AllVersions.Select(v => v.Version).ToArray();
/// <summary>
/// Initializes a new instance of the <see cref="OAuth2ChannelBase"/> class.
/// </summary>
/// <param name="channelBindingElements">The channel binding elements.</param>
internal OAuth2ChannelBase(params IChannelBindingElement[] channelBindingElements)
: base(MessageTypes, Versions, channelBindingElements) {
}
/// <summary>
/// Allows preprocessing and validation of message data before an appropriate message type is
/// selected or deserialized.
/// </summary>
/// <param name="fields">The received message data.</param>
protected override void FilterReceivedFields(IDictionary<string, string> fields) {
base.FilterReceivedFields(fields);
// Apply the OAuth 2.0 section 2.1 requirement:
// Parameters sent without a value MUST be treated as if they were omitted from the request.
// The authorization server SHOULD ignore unrecognized request parameters.
var emptyKeys = from pair in fields
where String.IsNullOrEmpty(pair.Value)
select pair.Key;
foreach (string emptyKey in emptyKeys.ToList()) {
fields.Remove(emptyKey);
}
}
}
}
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