AsyncOAuth を無理やり Windows.Net.Http 空間でも使えるように変換をかけて使うもの。Windows 8.1 Preview で UserStream を正常稼働させるのに必要。 なお、以下のコードを実行すればよい: private static HttpClient CreateClient( Account a ) { var baseFilter = new HttpBaseProtocolFilter(); baseFilter.AutomaticDecompression = true; baseFilter.IgnorableServerCertificateErrors.Add( ChainValidationResult.Untrusted );…

OAuthFilter.cs

using AsyncOAuth;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Windows.Foundation;
using Windows.Web.Http;
using Windows.Web.Http.Headers;
using Windows.Web.Http.Filters;

namespace Mntone.Critica.WindowsStore.Models.Communication
{
	public class OAuthFilter: IHttpFilter
	{
		private readonly IHttpFilter _filter;
		private readonly string _consumerKey, _consumerSecret;
		private readonly Token _token;
		private readonly IEnumerable<KeyValuePair<string, string>> _parameters;

		public OAuthFilter(
			string consumerKey,
			string consumerSecret,
			Token token = null,
			IEnumerable<KeyValuePair<string, string>> optionalOAuthHeaderParameters = null ):
			this( new HttpBaseProtocolFilter(), consumerKey, consumerSecret, token, optionalOAuthHeaderParameters )
		{
		}

		public OAuthFilter(
			IHttpFilter filter,
			string consumerKey,
			string consumerSecret,
			Token token = null,
			IEnumerable<KeyValuePair<string, string>> optionalOAuthHeaderParameters = null )
		{
			_filter = filter;
			_consumerKey = consumerKey;
			_consumerSecret = consumerSecret;
			_token = token;
			_parameters = optionalOAuthHeaderParameters ?? Enumerable.Empty<KeyValuePair<string, string>>();
		}

		public void Dispose()
		{
			GC.SuppressFinalize( this );
		}

		public IAsyncOperationWithProgress<HttpResponseMessage, HttpProgress> SendRequestAsync( HttpRequestMessage request )
		{
			var sendParameter = _parameters;
			if( request.Method.Method == "POST" )
			{
				// form url encoded content
				if( request.Content is HttpFormUrlEncodedContent )
				{
					var extraParameter = request.Content.ReadAsStringAsync().GetResults();
					var parsed = new WwwFormUrlDecoder( extraParameter );
					sendParameter = sendParameter.Concat( parsed.Select( x => new KeyValuePair<string, string>( x.Name, x.Value ) ) );
				}
			}

			var headerParams = OAuthUtility.BuildBasicParameters(
				_consumerKey, _consumerSecret, request.RequestUri.OriginalString, ConvertWindowsToSystem( request.Method ), _token, sendParameter );
			headerParams = headerParams.Concat( _parameters );

			var header = string.Join( ",", headerParams.Select( p => p.Key + "=\"" + p.Value + "\"" ) );
			request.Headers.Authorization = new HttpCredentialsHeaderValue( "OAuth", header );
			return _filter.SendRequestAsync( request );
		}

		private System.Net.Http.HttpMethod ConvertWindowsToSystem( HttpMethod method )
		{
			System.Net.Http.HttpMethod oMethod;
			if( method.Method == "DELETE" ) oMethod = System.Net.Http.HttpMethod.Delete;
			else if( method.Method == "GET" ) oMethod = System.Net.Http.HttpMethod.Get;
			else if( method.Method == "HEAD" ) oMethod = System.Net.Http.HttpMethod.Head;
			else if( method.Method == "OPTIONS" ) oMethod = System.Net.Http.HttpMethod.Options;
			else if( method.Method == "POST" ) oMethod = System.Net.Http.HttpMethod.Post;
			else if( method.Method == "PUT" ) oMethod = System.Net.Http.HttpMethod.Put;
			else throw new ArgumentException();
			return oMethod;
		}
	}
}