OpenTween/Connection/Networking.cs

   1 // OpenTween - Client of Twitter
   2 // Copyright (c) 2014 kim_upsilon (@kim_upsilon) <https://upsilo.net/~upsilon/>
   3 // All rights reserved.
   4 //
   5 // This file is part of OpenTween.
   6 //
   7 // This program is free software; you can redistribute it and/or modify it
   8 // under the terms of the GNU General Public License as published by the Free
   9 // Software Foundation; either version 3 of the License, or (at your option)
  10 // any later version.
  11 //
  12 // This program is distributed in the hope that it will be useful, but
  13 // WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14 // or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  15 // for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License along
  18 // with this program. If not, see <http://www.gnu.org/licenses/>, or write to
  19 // the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
  20 // Boston, MA 02110-1301, USA.
  21
  22 using System;
  23 using System.Collections.Generic;
  24 using System.Diagnostics.CodeAnalysis;
  25 using System.Linq;
  26 using System.Net;
  27 using System.Net.Cache;
  28 using System.Net.Http;
  29 using System.Text;
  30 using System.Threading;
  31 using System.Threading.Tasks;
  32
  33 namespace OpenTween.Connection
  34 {
  35     public static class Networking
  36     {
  37         public static TimeSpan DefaultTimeout { get; set; }
  38         public static TimeSpan UploadImageTimeout { get; set; }
  39
  40         /// <summary>
  41         /// 通信に使用するプロキシの種類
  42         /// </summary>
  43         public static ProxyType ProxyType { get; private set; } = ProxyType.IE;
  44
  45         /// <summary>
  46         /// 通信に使用するプロキシ
  47         /// </summary>
  48         public static IWebProxy Proxy { get; private set; } = null;
  49
  50         /// <summary>
  51         /// OpenTween 内で共通して使用する HttpClient インスタンス
  52         /// </summary>
  53         public static HttpClient Http => globalHttpClient;
  54
  55         /// <summary>
  56         /// pbs.twimg.com で IPv4 を強制的に使用する
  57         /// </summary>
  58         public static bool ForceIPv4
  59         {
  60             get => forceIPv4;
  61             set
  62             {
  63                 if (forceIPv4 == value)
  64                     return;
  65
  66                 forceIPv4 = value;
  67
  68                 // Network.Http を再作成させる
  69                 OnWebProxyChanged(EventArgs.Empty);
  70             }
  71         }
  72
  73         private static bool IsWindows7
  74         {
  75             get
  76             {
  77                 var os = Environment.OSVersion;
  78                 return os.Platform == PlatformID.Win32NT && os.Version.Major == 6 && os.Version.Minor == 1;
  79             }
  80         }
  81
  82         /// <summary>
  83         /// Webプロキシの設定が変更された場合に発生します
  84         /// </summary>
  85         public static event EventHandler WebProxyChanged;
  86
  87         private static bool initialized = false;
  88         private static HttpClient globalHttpClient;
  89         private static bool forceIPv4 = false;
  90
  91         [SuppressMessage("Microsoft.Reliability", "CA2000:DisposeObjectsBeforeLosingScope")]
  92         static Networking()
  93         {
  94             DefaultTimeout = TimeSpan.FromSeconds(20);
  95             UploadImageTimeout = TimeSpan.FromSeconds(60);
  96             globalHttpClient = CreateHttpClient(new HttpClientHandler());
  97         }
  98
  99         /// <summary>
 100         /// ネットワーク接続前に行う処理。起動時に一回だけ実行する必要があります。
 101         /// </summary>
 102         public static void Initialize()
 103         {
 104             Networking.initialized = true;
 105
 106             ServicePointManager.Expect100Continue = false;
 107
 108             // Win7 では SystemDefault が SSL3.0 または TLS1.0 のため、明示的にバージョンを引き上げる必要がある
 109             if (IsWindows7)
 110                 ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
 111         }
 112
 113         public static void SetWebProxy(ProxyType proxyType, string proxyAddress, int proxyPort,
 114             string proxyUser, string proxyPassword)
 115         {
 116             IWebProxy proxy;
 117             switch (proxyType)
 118             {
 119                 case ProxyType.None:
 120                     proxy = null;
 121                     break;
 122                 case ProxyType.Specified:
 123                     proxy = new WebProxy(proxyAddress, proxyPort);
 124                     if (!string.IsNullOrEmpty(proxyUser) || !string.IsNullOrEmpty(proxyPassword))
 125                         proxy.Credentials = new NetworkCredential(proxyUser, proxyPassword);
 126                     break;
 127                 case ProxyType.IE:
 128                 default:
 129                     proxy = WebRequest.GetSystemWebProxy();
 130                     break;
 131             }
 132
 133             Networking.ProxyType = proxyType;
 134             Networking.Proxy = proxy;
 135
 136             NativeMethods.SetProxy(proxyType, proxyAddress, proxyPort, proxyUser, proxyPassword);
 137
 138             OnWebProxyChanged(EventArgs.Empty);
 139         }
 140
 141         /// <summary>
 142         /// OpenTween で必要な設定を施した HttpClientHandler インスタンスを生成します
 143         /// </summary>
 144         [SuppressMessage("Microsoft.Reliability", "CA2000:DisposeObjectsBeforeLosingScope")]
 145         public static WebRequestHandler CreateHttpClientHandler()
 146         {
 147             var handler = new WebRequestHandler
 148             {
 149                 AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate,
 150             };
 151
 152             if (Networking.Proxy != null)
 153             {
 154                 handler.UseProxy = true;
 155                 handler.Proxy = Networking.Proxy;
 156             }
 157             else
 158             {
 159                 handler.UseProxy = false;
 160             }
 161
 162             return handler;
 163         }
 164
 165         /// <summary>
 166         /// OpenTween で必要な設定を施した HttpClient インスタンスを生成します
 167         /// </summary>
 168         /// <remarks>
 169         /// 通常は Networking.Http を使用すべきです。
 170         /// このメソッドを使用する場合は、WebProxyChanged イベントが発生する度に HttpClient を生成し直すように実装してください。
 171         /// </remarks>
 172         [SuppressMessage("Microsoft.Reliability", "CA2000:DisposeObjectsBeforeLosingScope")]
 173         public static HttpClient CreateHttpClient(HttpMessageHandler handler)
 174         {
 175             HttpClient client;
 176             if (ForceIPv4)
 177                 client = new HttpClient(new ForceIPv4Handler(handler));
 178             else
 179                 client = new HttpClient(handler);
 180
 181             client.Timeout = Networking.DefaultTimeout;
 182             client.DefaultRequestHeaders.Add("User-Agent", Networking.GetUserAgentString());
 183
 184             return client;
 185         }
 186
 187         public static string GetUserAgentString(bool fakeMSIE = false)
 188         {
 189             if (fakeMSIE)
 190                 return ApplicationSettings.AssemblyName + "/" + MyCommon.FileVersion + " (compatible; MSIE 10.0)";
 191             else
 192                 return ApplicationSettings.AssemblyName + "/" + MyCommon.FileVersion;
 193         }
 194
 195         /// <summary>
 196         /// Initialize() メソッドが事前に呼ばれているか確認します
 197         /// </summary>
 198         internal static void CheckInitialized()
 199         {
 200             if (!Networking.initialized)
 201                 throw new InvalidOperationException("Sequence error.(not initialized)");
 202         }
 203
 204         [SuppressMessage("Microsoft.Reliability", "CA2000:DisposeObjectsBeforeLosingScope")]
 205         private static void OnWebProxyChanged(EventArgs e)
 206         {
 207             var newClient = Networking.CreateHttpClient(Networking.CreateHttpClientHandler());
 208             var oldClient = Interlocked.Exchange(ref globalHttpClient, newClient);
 209             oldClient.Dispose();
 210
 211             WebProxyChanged?.Invoke(null, e);
 212         }
 213
 214         private class ForceIPv4Handler : DelegatingHandler
 215         {
 216             private readonly IPAddress ipv4Address;
 217
 218             public ForceIPv4Handler(HttpMessageHandler innerHandler)
 219                 : base(innerHandler)
 220             {
 221                 foreach (var address in Dns.GetHostAddresses("pbs.twimg.com"))
 222                     if (address.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
 223                         this.ipv4Address = address;
 224             }
 225
 226             protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
 227             {
 228                 var requestUri = request.RequestUri;
 229                 if (requestUri.Host == "pbs.twimg.com")
 230                 {
 231                     var rewriteUriStr = requestUri.GetLeftPart(UriPartial.Scheme) + this.ipv4Address + requestUri.PathAndQuery;
 232                     request.RequestUri = new Uri(rewriteUriStr);
 233                     request.Headers.Host = "pbs.twimg.com";
 234                 }
 235
 236                 return base.SendAsync(request, cancellationToken);
 237             }
 238         }
 239     }
 240
 241     public enum ProxyType
 242     {
 243         None,
 244         IE,
 245         Specified,
 246     }
 247 }