mcs/class/System/System.Net/WebRequest.cs

   1 //
   2 // System.Net.WebRequest
   3 //
   4 // Authors:
   5 //  Lawrence Pit (loz@cable.a2000.nl)
   6 //      Marek Safar (marek.safar@gmail.com)
   7 //
   8 // Copyright 2011 Xamarin Inc.
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 using System;
  31 using System.Collections;
  32 using System.Collections.Specialized;
  33 using System.Configuration;
  34 using System.IO;
  35 using System.Reflection;
  36 using System.Runtime.Serialization;
  37 using System.Globalization;
  38 using System.Net.Configuration;
  39 using System.Net.Security;
  40 using System.Net.Cache;
  41 using System.Security.Principal;
  42 using System.Threading.Tasks;
  43
  44 #if NET_2_1
  45 using ConfigurationException = System.ArgumentException;
  46
  47 namespace System.Net.Configuration {
  48         class Dummy {}
  49 }
  50 #endif
  51
  52 namespace System.Net
  53 {
  54         [Serializable]
  55         public abstract class WebRequest : MarshalByRefObject, ISerializable {
  56                 static HybridDictionary prefixes = new HybridDictionary ();
  57                 static bool isDefaultWebProxySet;
  58                 static IWebProxy defaultWebProxy;
  59                 static RequestCachePolicy defaultCachePolicy;
  60
  61                 static WebRequest ()
  62                 {
  63 #if MOBILE
  64                         IWebRequestCreate http = new HttpRequestCreator ();
  65                         RegisterPrefix ("http", http);
  66                         RegisterPrefix ("https", http);
  67                         RegisterPrefix ("file", new FileWebRequestCreator ());
  68                         RegisterPrefix ("ftp", new FtpRequestCreator ());
  69 #else
  70         #if CONFIGURATION_DEP
  71                         object cfg = ConfigurationManager.GetSection ("system.net/webRequestModules");
  72                         WebRequestModulesSection s = cfg as WebRequestModulesSection;
  73                         if (s != null) {
  74                                 foreach (WebRequestModuleElement el in
  75                                          s.WebRequestModules)
  76                                         AddPrefix (el.Prefix, el.Type);
  77                                 return;
  78                         }
  79         #endif
  80                         ConfigurationSettings.GetConfig ("system.net/webRequestModules");
  81 #endif
  82                 }
  83
  84                 protected WebRequest ()
  85                 {
  86                 }
  87
  88                 protected WebRequest (SerializationInfo serializationInfo, StreamingContext streamingContext)
  89                 {
  90                 }
  91
  92                 static Exception GetMustImplement ()
  93                 {
  94                         return new NotImplementedException ("This method must be implemented in derived classes");
  95                 }
  96
  97                 // Properties
  98
  99                 private AuthenticationLevel authentication_level = AuthenticationLevel.MutualAuthRequested;
 100
 101                 public AuthenticationLevel AuthenticationLevel
 102                 {
 103                         get {
 104                                 return(authentication_level);
 105                         }
 106                         set {
 107                                 authentication_level = value;
 108                         }
 109                 }
 110
 111                 public virtual string ConnectionGroupName {
 112                         get { throw GetMustImplement (); }
 113                         set { throw GetMustImplement (); }
 114                 }
 115
 116                 public virtual long ContentLength {
 117                         get { throw GetMustImplement (); }
 118                         set { throw GetMustImplement (); }
 119                 }
 120
 121                 public virtual string ContentType {
 122                         get { throw GetMustImplement (); }
 123                         set { throw GetMustImplement (); }
 124                 }
 125
 126                 public virtual ICredentials Credentials {
 127                         get { throw GetMustImplement (); }
 128                         set { throw GetMustImplement (); }
 129                 }
 130
 131                 [MonoTODO ("Implement the caching system. Currently always returns a policy with the NoCacheNoStore level")]
 132                 public virtual RequestCachePolicy CachePolicy
 133                 {
 134                         get { return DefaultCachePolicy; }
 135                         set {
 136                         }
 137                 }
 138
 139                 public static RequestCachePolicy DefaultCachePolicy {
 140                         get {
 141                                 return defaultCachePolicy ?? (defaultCachePolicy = new HttpRequestCachePolicy (HttpRequestCacheLevel.NoCacheNoStore));
 142                         }
 143                         set {
 144                                 throw GetMustImplement ();
 145                         }
 146                 }
 147
 148                 public virtual WebHeaderCollection Headers {
 149                         get { throw GetMustImplement (); }
 150                         set { throw GetMustImplement (); }
 151                 }
 152
 153
 154                 public virtual string Method {
 155                         get { throw GetMustImplement (); }
 156                         set { throw GetMustImplement (); }
 157                 }
 158
 159                 public virtual bool PreAuthenticate {
 160                         get { throw GetMustImplement (); }
 161                         set { throw GetMustImplement (); }
 162                 }
 163
 164                 public virtual IWebProxy Proxy {
 165                         get { throw GetMustImplement (); }
 166                         set { throw GetMustImplement (); }
 167                 }
 168
 169                 public virtual Uri RequestUri {
 170                         get { throw GetMustImplement (); }
 171                 }
 172
 173                 public virtual int Timeout {
 174                         get { throw GetMustImplement (); }
 175                         set { throw GetMustImplement (); }
 176                 }
 177
 178                 public virtual bool UseDefaultCredentials
 179                 {
 180                         get {
 181                                 throw GetMustImplement ();
 182                         }
 183                         set {
 184                                 throw GetMustImplement ();
 185                         }
 186                 }
 187
 188                 public TokenImpersonationLevel ImpersonationLevel { get; set; }
 189
 190 //              volatile static IWebProxy proxy;
 191                 static readonly object lockobj = new object ();
 192
 193                 public static IWebProxy DefaultWebProxy {
 194                         get {
 195                                 if (!isDefaultWebProxySet) {
 196                                         lock (lockobj) {
 197                                                 if (defaultWebProxy == null)
 198                                                         defaultWebProxy = GetDefaultWebProxy ();
 199                                         }
 200                                 }
 201                                 return defaultWebProxy;
 202                         }
 203                         set {
 204                                 /* MS documentation states that a null value would cause an ArgumentNullException
 205                                  * but that's not the way it behaves:
 206                                  * https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=304724
 207                                  */
 208                                 defaultWebProxy = value;
 209                                 isDefaultWebProxySet = true;
 210                         }
 211                 }
 212
 213                 [MonoTODO("Needs to respect Module, Proxy.AutoDetect, and Proxy.ScriptLocation config settings")]
 214                 static IWebProxy GetDefaultWebProxy ()
 215                 {
 216 #if CONFIGURATION_DEP
 217                         DefaultProxySection sec = ConfigurationManager.GetSection ("system.net/defaultProxy") as DefaultProxySection;
 218                         WebProxy p;
 219
 220                         if (sec == null)
 221                                 return GetSystemWebProxy ();
 222
 223                         ProxyElement pe = sec.Proxy;
 224
 225                         if ((pe.UseSystemDefault != ProxyElement.UseSystemDefaultValues.False) && (pe.ProxyAddress == null)) {
 226                                 IWebProxy proxy = GetSystemWebProxy ();
 227
 228                                 if (!(proxy is WebProxy))
 229                                         return proxy;
 230
 231                                 p = (WebProxy) proxy;
 232                         } else
 233                                 p = new WebProxy ();
 234
 235                         if (pe.ProxyAddress != null)
 236                                 p.Address = pe.ProxyAddress;
 237
 238                         if (pe.BypassOnLocal != ProxyElement.BypassOnLocalValues.Unspecified)
 239                                 p.BypassProxyOnLocal = (pe.BypassOnLocal == ProxyElement.BypassOnLocalValues.True);
 240
 241                         foreach(BypassElement elem in sec.BypassList)
 242                                 p.BypassArrayList.Add(elem.Address);
 243
 244                         return p;
 245 #else
 246                         return GetSystemWebProxy ();
 247 #endif
 248                 }
 249
 250                 // Methods
 251
 252                 public virtual void Abort()
 253                 {
 254                         throw GetMustImplement ();
 255                 }
 256
 257                 public virtual IAsyncResult BeginGetRequestStream (AsyncCallback callback, object state)
 258                 {
 259                         throw GetMustImplement ();
 260                 }
 261
 262                 public virtual IAsyncResult BeginGetResponse (AsyncCallback callback, object state)
 263                 {
 264                         throw GetMustImplement ();
 265                 }
 266
 267                 public static WebRequest Create (string requestUriString)
 268                 {
 269                         if (requestUriString == null)
 270                                 throw new ArgumentNullException ("requestUriString");
 271                         return Create (new Uri (requestUriString));
 272                 }
 273
 274                 public static WebRequest Create (Uri requestUri)
 275                 {
 276                         if (requestUri == null)
 277                                 throw new ArgumentNullException ("requestUri");
 278                         return GetCreator (requestUri.AbsoluteUri).Create (requestUri);
 279                 }
 280
 281                 public static WebRequest CreateDefault (Uri requestUri)
 282                 {
 283                         if (requestUri == null)
 284                                 throw new ArgumentNullException ("requestUri");
 285                         return GetCreator (requestUri.Scheme).Create (requestUri);
 286                 }
 287                 static HttpWebRequest SharedCreateHttp (Uri uri)
 288                 {
 289                         if (uri.Scheme != "http" && uri.Scheme != "https")
 290                                 throw new NotSupportedException ("The uri should start with http or https");
 291
 292                         return new HttpWebRequest (uri);
 293                 }
 294
 295                 public static HttpWebRequest CreateHttp (string requestUriString)
 296                 {
 297                         if (requestUriString == null)
 298                                 throw new ArgumentNullException ("requestUriString");
 299                         return SharedCreateHttp (new Uri (requestUriString));
 300                 }
 301
 302                 public static HttpWebRequest CreateHttp (Uri requestUri)
 303                 {
 304                         if (requestUri == null)
 305                                 throw new ArgumentNullException ("requestUri");
 306                         return SharedCreateHttp (requestUri);
 307                 }
 308                 public virtual Stream EndGetRequestStream (IAsyncResult asyncResult)
 309                 {
 310                         throw GetMustImplement ();
 311                 }
 312
 313                 public virtual WebResponse EndGetResponse (IAsyncResult asyncResult)
 314                 {
 315                         throw GetMustImplement ();
 316                 }
 317
 318                 public virtual Stream GetRequestStream()
 319                 {
 320                         throw GetMustImplement ();
 321                 }
 322
 323                 public virtual WebResponse GetResponse()
 324                 {
 325                         throw GetMustImplement ();
 326                 }
 327
 328                 [MonoTODO("Look in other places for proxy config info")]
 329                 public static IWebProxy GetSystemWebProxy ()
 330                 {
 331 #if MONOTOUCH
 332                         return CFNetwork.GetDefaultProxy ();
 333 #else
 334 #if MONODROID
 335                         // Return the system web proxy.  This only works for ICS+.
 336                         var androidProxy = AndroidPlatform.GetDefaultProxy ();
 337                         if (androidProxy != null)
 338                                 return androidProxy;
 339 #endif
 340 #if !NET_2_1
 341                         if (IsWindows ()) {
 342                                 int iProxyEnable = (int)Microsoft.Win32.Registry.GetValue ("HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings", "ProxyEnable", 0);
 343
 344                                 if (iProxyEnable > 0) {
 345                                         string strHttpProxy = "";
 346                                         bool bBypassOnLocal = false;
 347                                         ArrayList al = new ArrayList ();
 348
 349                                         string strProxyServer = (string)Microsoft.Win32.Registry.GetValue ("HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings", "ProxyServer", null);
 350                                         string strProxyOverrride = (string)Microsoft.Win32.Registry.GetValue ("HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings", "ProxyOverride", null);
 351
 352                                         if (strProxyServer.Contains ("=")) {
 353                                                 foreach (string strEntry in strProxyServer.Split (new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries))
 354                                                         if (strEntry.StartsWith ("http=")) {
 355                                                                 strHttpProxy = strEntry.Substring (5);
 356                                                                 break;
 357                                                         }
 358                                         } else strHttpProxy = strProxyServer;
 359
 360                                         if (strProxyOverrride != null) {
 361                                                 string[] bypassList = strProxyOverrride.Split (new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries);
 362
 363                                                 foreach (string str in bypassList) {
 364                                                         if (str != "<local>")
 365                                                                 al.Add (str);
 366                                                         else
 367                                                                 bBypassOnLocal = true;
 368                                                 }
 369                                         }
 370
 371                                         return new WebProxy (strHttpProxy, bBypassOnLocal, al.ToArray (typeof(string)) as string[]);
 372                                 }
 373                         } else {
 374 #endif
 375                                 if (Platform.IsMacOS)
 376                                         return CFNetwork.GetDefaultProxy ();
 377
 378                                 string address = Environment.GetEnvironmentVariable ("http_proxy");
 379
 380                                 if (address == null)
 381                                         address = Environment.GetEnvironmentVariable ("HTTP_PROXY");
 382
 383                                 if (address != null) {
 384                                         try {
 385                                                 if (!address.StartsWith ("http://"))
 386                                                         address = "http://" + address;
 387
 388                                                 Uri uri = new Uri (address);
 389                                                 IPAddress ip;
 390
 391                                                 if (IPAddress.TryParse (uri.Host, out ip)) {
 392                                                         if (IPAddress.Any.Equals (ip)) {
 393                                                                 UriBuilder builder = new UriBuilder (uri);
 394                                                                 builder.Host = "127.0.0.1";
 395                                                                 uri = builder.Uri;
 396                                                         } else if (IPAddress.IPv6Any.Equals (ip)) {
 397                                                                 UriBuilder builder = new UriBuilder (uri);
 398                                                                 builder.Host = "[::1]";
 399                                                                 uri = builder.Uri;
 400                                                         }
 401                                                 }
 402
 403                                                 bool bBypassOnLocal = false;
 404                                                 ArrayList al = new ArrayList ();
 405                                                 string bypass = Environment.GetEnvironmentVariable ("no_proxy");
 406
 407                                                 if (bypass == null)
 408                                                         bypass = Environment.GetEnvironmentVariable ("NO_PROXY");
 409
 410                                                 if (bypass != null) {
 411                                                         string[] bypassList = bypass.Split (new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
 412
 413                                                         foreach (string str in bypassList) {
 414                                                                 if (str != "*.local")
 415                                                                         al.Add (str);
 416                                                                 else
 417                                                                         bBypassOnLocal = true;
 418                                                         }
 419                                                 }
 420
 421                                                 return new WebProxy (uri, bBypassOnLocal, al.ToArray (typeof(string)) as string[]);
 422                                         } catch (UriFormatException) {
 423                                         }
 424                                 }
 425 #if !NET_2_1
 426                         }
 427 #endif
 428
 429                         return new WebProxy ();
 430 #endif // MONOTOUCH
 431                 }
 432
 433                 void ISerializable.GetObjectData (SerializationInfo serializationInfo, StreamingContext streamingContext)
 434                 {
 435                         throw new NotSupportedException ();
 436                 }
 437
 438                 protected virtual void GetObjectData (SerializationInfo serializationInfo, StreamingContext streamingContext)
 439                 {
 440                         throw GetMustImplement ();
 441                 }
 442
 443                 public static bool RegisterPrefix (string prefix, IWebRequestCreate creator)
 444                 {
 445                         if (prefix == null)
 446                                 throw new ArgumentNullException ("prefix");
 447                         if (creator == null)
 448                                 throw new ArgumentNullException ("creator");
 449
 450                         lock (prefixes.SyncRoot) {
 451                                 string lowerCasePrefix = prefix.ToLower (CultureInfo.InvariantCulture);
 452                                 if (prefixes.Contains (lowerCasePrefix))
 453                                         return false;
 454                                 prefixes.Add (lowerCasePrefix, creator);
 455                         }
 456                         return true;
 457                 }
 458
 459                 private static IWebRequestCreate GetCreator (string prefix)
 460                 {
 461                         int longestPrefix = -1;
 462                         IWebRequestCreate creator = null;
 463
 464                         prefix = prefix.ToLower (CultureInfo.InvariantCulture);
 465
 466                         IDictionaryEnumerator e = prefixes.GetEnumerator ();
 467                         while (e.MoveNext ()) {
 468                                 string key = e.Key as string;
 469
 470                                 if (key.Length <= longestPrefix)
 471                                         continue;
 472
 473                                 if (!prefix.StartsWith (key))
 474                                         continue;
 475
 476                                 longestPrefix = key.Length;
 477                                 creator = (IWebRequestCreate) e.Value;
 478                         }
 479
 480                         if (creator == null)
 481                                 throw new NotSupportedException (prefix);
 482
 483                         return creator;
 484                 }
 485
 486                 internal static bool IsWindows ()
 487                 {
 488                         return (int) Environment.OSVersion.Platform < 4;
 489                 }
 490
 491                 internal static void ClearPrefixes ()
 492                 {
 493                         prefixes.Clear ();
 494                 }
 495
 496                 internal static void RemovePrefix (string prefix)
 497                 {
 498                         prefixes.Remove (prefix);
 499                 }
 500
 501                 internal static void AddPrefix (string prefix, string typeName)
 502                 {
 503                         Type type = Type.GetType (typeName);
 504                         if (type == null)
 505                                 throw new ConfigurationException (String.Format ("Type {0} not found", typeName));
 506                         AddPrefix (prefix, type);
 507                 }
 508
 509                 internal static void AddPrefix (string prefix, Type type)
 510                 {
 511                         object o = Activator.CreateInstance (type, true);
 512                         prefixes [prefix] = o;
 513                 }
 514
 515                 public virtual Task<Stream> GetRequestStreamAsync ()
 516                 {
 517                         return Task<Stream>.Factory.FromAsync (BeginGetRequestStream, EndGetRequestStream, null);
 518                 }
 519
 520                 public virtual Task<WebResponse> GetResponseAsync ()
 521                 {
 522                         return Task<WebResponse>.Factory.FromAsync (BeginGetResponse, EndGetResponse, null);
 523                 }
 524
 525         }
 526 }