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//-----------------------------------------------------------------------
// <copyright file="OAuth2ClientChannel.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.OAuth2.ChannelElements {
using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Diagnostics.Contracts;
using System.Net;
using System.Web;
using DotNetOpenAuth.Messaging;
/// <summary>
/// The messaging channel used by OAuth 2.0 Clients.
/// </summary>
internal class OAuth2ClientChannel : OAuth2ChannelBase {
/// <summary>
/// Initializes a new instance of the <see cref="OAuth2ClientChannel"/> class.
/// </summary>
internal OAuth2ClientChannel() {
}
/// <summary>
/// Prepares an HTTP request that carries a given message.
/// </summary>
/// <param name="request">The message to send.</param>
/// <returns>
/// The <see cref="HttpWebRequest"/> prepared to send the request.
/// </returns>
/// <remarks>
/// This method must be overridden by a derived class, unless the <see cref="Channel.RequestCore"/> method
/// is overridden and does not require this method.
/// </remarks>
protected override HttpWebRequest CreateHttpRequest(IDirectedProtocolMessage request) {
HttpWebRequest httpRequest;
if ((request.HttpMethods & HttpDeliveryMethods.GetRequest) != 0) {
httpRequest = InitializeRequestAsGet(request);
} else if ((request.HttpMethods & HttpDeliveryMethods.PostRequest) != 0) {
httpRequest = InitializeRequestAsPost(request);
} else {
throw new NotSupportedException();
}
return httpRequest;
}
/// <summary>
/// Gets the protocol message that may be in the given HTTP response.
/// </summary>
/// <param name="response">The response that is anticipated to contain an protocol message.</param>
/// <returns>
/// The deserialized message parts, if found. Null otherwise.
/// </returns>
/// <exception cref="ProtocolException">Thrown when the response is not valid.</exception>
protected override IDictionary<string, string> ReadFromResponseCore(IncomingWebResponse response) {
// The spec says direct responses should be JSON objects, but Facebook uses HttpFormUrlEncoded instead, calling it text/plain
// Others return text/javascript. Again bad.
string body = response.GetResponseReader().ReadToEnd();
if (response.ContentType.MediaType == JsonEncoded || response.ContentType.MediaType == JsonTextEncoded) {
return this.DeserializeFromJson(body);
} else if (response.ContentType.MediaType == HttpFormUrlEncoded || response.ContentType.MediaType == PlainTextEncoded) {
return HttpUtility.ParseQueryString(body).ToDictionary();
} else {
throw ErrorUtilities.ThrowProtocol("Unexpected response Content-Type {0}", response.ContentType.MediaType);
}
}
/// <summary>
/// Gets the protocol message that may be embedded in the given HTTP request.
/// </summary>
/// <param name="request">The request to search for an embedded message.</param>
/// <returns>
/// The deserialized message, if one is found. Null otherwise.
/// </returns>
protected override IDirectedProtocolMessage ReadFromRequestCore(HttpRequestInfo request) {
Logger.Channel.DebugFormat("Incoming HTTP request: {0} {1}", request.HttpMethod, request.UrlBeforeRewriting.AbsoluteUri);
var fields = request.QueryStringBeforeRewriting.ToDictionary();
// Also read parameters from the fragment, if it's available.
// Typically the fragment is not available because the browser doesn't send it to a web server
// but this request may have been fabricated by an installed desktop app, in which case
// the fragment is available.
string fragment = request.UrlBeforeRewriting.Fragment;
if (!string.IsNullOrEmpty(fragment)) {
foreach (var pair in HttpUtility.ParseQueryString(fragment.Substring(1)).ToDictionary()) {
fields.Add(pair.Key, pair.Value);
}
}
MessageReceivingEndpoint recipient;
try {
recipient = request.GetRecipient();
} catch (ArgumentException ex) {
Logger.Messaging.WarnFormat("Unrecognized HTTP request: ", ex);
return null;
}
return (IDirectedProtocolMessage)this.Receive(fields, recipient);
}
/// <summary>
/// Queues a message for sending in the response stream where the fields
/// are sent in the response stream in querystring style.
/// </summary>
/// <param name="response">The message to send as a response.</param>
/// <returns>
/// The pending user agent redirect based message to be sent as an HttpResponse.
/// </returns>
/// <remarks>
/// This method implements spec OAuth V1.0 section 5.3.
/// </remarks>
protected override OutgoingWebResponse PrepareDirectResponse(IProtocolMessage response) {
// Clients don't ever send direct responses.
throw new NotImplementedException();
}
}
}
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