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//-----------------------------------------------------------------------
// <copyright file="OAuthMessageTypeProvider.cs" company="Andrew Arnott">
// Copyright (c) Andrew Arnott. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOAuth {
using System;
using System.Collections.Generic;
using DotNetOAuth.Messages;
using DotNetOAuth.Messaging;
/// <summary>
/// An OAuth-protocol specific implementation of the <see cref="IMessageTypeProvider"/>
/// interface.
/// </summary>
internal class OAuthMessageTypeProvider : IMessageTypeProvider {
#region IMessageTypeProvider Members
/// <summary>
/// Analyzes an incoming request message payload to discover what kind of
/// message is embedded in it and returns the type, or null if no match is found.
/// </summary>
/// <param name="fields">The name/value pairs that make up the message payload.</param>
/// <remarks>
/// The request messages are:
/// RequestTokenMessage
/// RequestAccessTokenMessage
/// DirectUserToServiceProviderMessage
/// AccessProtectedResourcesMessage
/// </remarks>
/// <returns>
/// The <see cref="IProtocolMessage"/>-derived concrete class that this message can
/// deserialize to. Null if the request isn't recognized as a valid protocol message.
/// </returns>
public Type GetRequestMessageType(IDictionary<string, string> fields) {
if (fields == null) {
throw new ArgumentNullException("fields");
}
if (fields.ContainsKey("oauth_consumer_key") &&
!fields.ContainsKey("oauth_token")) {
return typeof(RequestTokenMessage);
}
if (fields.ContainsKey("oauth_consumer_key") &&
fields.ContainsKey("oauth_token")) {
// Discern between RequestAccessToken and AccessProtectedResources,
// which have all the same parameters, by figuring out what type of token
// is in the token parameter.
bool tokenTypeIsAccessToken = false; // TODO
return tokenTypeIsAccessToken ? typeof(AccessProtectedResourcesMessage) :
typeof(RequestAccessTokenMessage);
}
// fail over to the message with no required fields at all.
return typeof(DirectUserToServiceProviderMessage);
}
/// <summary>
/// Analyzes an incoming request message payload to discover what kind of
/// message is embedded in it and returns the type, or null if no match is found.
/// </summary>
/// <param name="request">
/// The message that was sent as a request that resulted in the response.
/// Null on a Consumer site that is receiving an indirect message from the Service Provider.
/// </param>
/// <param name="fields">The name/value pairs that make up the message payload.</param>
/// <returns>
/// The <see cref="IProtocolMessage"/>-derived concrete class that this message can
/// deserialize to. Null if the request isn't recognized as a valid protocol message.
/// </returns>
/// <remarks>
/// The response messages are:
/// UnauthorizedRequestTookenMessage
/// DirectUserToConsumerMessage
/// GrantAccessTokenMessage
/// </remarks>
public Type GetResponseMessageType(IProtocolMessage request, IDictionary<string, string> fields) {
if (fields == null) {
throw new ArgumentNullException("fields");
}
// All response messages have the oauth_token field.
if (!fields.ContainsKey("oauth_token")) {
return null;
}
if (request == null) {
return typeof(DirectUserToConsumerMessage);
}
// All direct message responses should haev the oauth_token_secret field.
if (!fields.ContainsKey("oauth_token_secret")) {
Logger.Error("An OAuth message was expected to contain an oauth_token_secret but didn't.");
return null;
}
if (request is RequestTokenMessage) {
return typeof(UnauthorizedRequestTokenMessage);
} else if (request is RequestAccessTokenMessage) {
return typeof(GrantAccessTokenMessage);
} else {
Logger.ErrorFormat("Unexpected response message given the request type {0}", request.GetType().Name);
throw new ProtocolException(Strings.InvalidIncomingMessage);
}
}
#endregion
}
}
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