mcs/class/System/System.Net/HttpListenerRequest.cs

   1 //
   2 // System.Net.HttpListenerRequest
   3 //
   4 // Authors:
   5 //      Gonzalo Paniagua Javier (gonzalo.mono@gmail.com)
   6 //      Marek Safar (marek.safar@gmail.com)
   7 //
   8 // Copyright (c) 2005 Novell, Inc. (http://www.novell.com)
   9 // Copyright (c) 2011-2012 Xamarin, Inc. (http://xamarin.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System.Collections;
  32 using System.Collections.Specialized;
  33 using System.Globalization;
  34 using System.IO;
  35 using System.Security.Cryptography.X509Certificates;
  36 using System.Text;
  37 using System.Security.Authentication.ExtendedProtection;
  38 using System.Threading.Tasks;
  39 using System.Net;
  40
  41 namespace System.Net {
  42         public sealed class HttpListenerRequest
  43         {
  44                 class Context : TransportContext
  45                 {
  46                         public override ChannelBinding GetChannelBinding (ChannelBindingKind kind)
  47                         {
  48                                 throw new NotImplementedException ();
  49                         }
  50                 }
  51
  52                 string [] accept_types;
  53                 Encoding content_encoding;
  54                 long content_length;
  55                 bool cl_set;
  56                 CookieCollection cookies;
  57                 WebHeaderCollection headers;
  58                 string method;
  59                 Stream input_stream;
  60                 Version version;
  61                 NameValueCollection query_string; // check if null is ok, check if read-only, check case-sensitiveness
  62                 string raw_url;
  63                 Uri url;
  64                 Uri referrer;
  65                 string [] user_languages;
  66                 HttpListenerContext context;
  67                 bool is_chunked;
  68                 bool ka_set;
  69                 bool keep_alive;
  70                 delegate X509Certificate2 GCCDelegate ();
  71                 GCCDelegate gcc_delegate;
  72
  73                 static byte [] _100continue = Encoding.ASCII.GetBytes ("HTTP/1.1 100 Continue\r\n\r\n");
  74
  75                 internal HttpListenerRequest (HttpListenerContext context)
  76                 {
  77                         this.context = context;
  78                         headers = new WebHeaderCollection ();
  79                         version = HttpVersion.Version10;
  80                 }
  81
  82                 static char [] separators = new char [] { ' ' };
  83
  84                 internal void SetRequestLine (string req)
  85                 {
  86                         string [] parts = req.Split (separators, 3);
  87                         if (parts.Length != 3) {
  88                                 context.ErrorMessage = "Invalid request line (parts).";
  89                                 return;
  90                         }
  91
  92                         method = parts [0];
  93                         foreach (char c in method){
  94                                 int ic = (int) c;
  95
  96                                 if ((ic >= 'A' && ic <= 'Z') ||
  97                                     (ic > 32 && c < 127 && c != '(' && c != ')' && c != '<' &&
  98                                      c != '<' && c != '>' && c != '@' && c != ',' && c != ';' &&
  99                                      c != ':' && c != '\\' && c != '"' && c != '/' && c != '[' &&
 100                                      c != ']' && c != '?' && c != '=' && c != '{' && c != '}'))
 101                                         continue;
 102
 103                                 context.ErrorMessage = "(Invalid verb)";
 104                                 return;
 105                         }
 106
 107                         raw_url = parts [1];
 108                         if (parts [2].Length != 8 || !parts [2].StartsWith ("HTTP/")) {
 109                                 context.ErrorMessage = "Invalid request line (version).";
 110                                 return;
 111                         }
 112
 113                         try {
 114                                 version = new Version (parts [2].Substring (5));
 115                                 if (version.Major < 1)
 116                                         throw new Exception ();
 117                         } catch {
 118                                 context.ErrorMessage = "Invalid request line (version).";
 119                                 return;
 120                         }
 121                 }
 122
 123                 void CreateQueryString (string query)
 124                 {
 125                         if (query == null || query.Length == 0) {
 126                                 query_string = new NameValueCollection (1);
 127                                 return;
 128                         }
 129
 130                         query_string = new NameValueCollection ();
 131                         if (query [0] == '?')
 132                                 query = query.Substring (1);
 133                         string [] components = query.Split ('&');
 134                         foreach (string kv in components) {
 135                                 int pos = kv.IndexOf ('=');
 136                                 if (pos == -1) {
 137                                         query_string.Add (null, WebUtility.UrlDecode (kv));
 138                                 } else {
 139                                         string key = WebUtility.UrlDecode (kv.Substring (0, pos));
 140                                         string val = WebUtility.UrlDecode (kv.Substring (pos + 1));
 141
 142                                         query_string.Add (key, val);
 143                                 }
 144                         }
 145                 }
 146
 147                 static bool MaybeUri (string s)
 148                 {
 149                         int p = s.IndexOf (':');
 150                         if (p == -1)
 151                                 return false;
 152
 153                         if (p >= 10)
 154                                 return false;
 155
 156                         return IsPredefinedScheme (s.Substring (0, p));
 157                 }
 158
 159                 //
 160                 // Using a simple block of if's is twice as slow as the compiler generated
 161                 // switch statement.   But using this tuned code is faster than the
 162                 // compiler generated code, with a million loops on x86-64:
 163                 //
 164                 // With "http": .10 vs .51 (first check)
 165                 // with "https": .16 vs .51 (second check)
 166                 // with "foo": .22 vs .31 (never found)
 167                 // with "mailto": .12 vs .51  (last check)
 168                 //
 169                 //
 170                 static bool IsPredefinedScheme (string scheme)
 171                 {
 172                         if (scheme == null || scheme.Length < 3)
 173                                 return false;
 174
 175                         char c = scheme [0];
 176                         if (c == 'h')
 177                                 return (scheme == "http" || scheme == "https");
 178                         if (c == 'f')
 179                                 return (scheme == "file" || scheme == "ftp");
 180
 181                         if (c == 'n'){
 182                                 c = scheme [1];
 183                                 if (c == 'e')
 184                                         return (scheme == "news" || scheme == "net.pipe" || scheme == "net.tcp");
 185                                 if (scheme == "nntp")
 186                                         return true;
 187                                 return false;
 188                         }
 189                         if ((c == 'g' && scheme == "gopher") || (c == 'm' && scheme == "mailto"))
 190                                 return true;
 191
 192                         return false;
 193                 }
 194
 195                 internal void FinishInitialization ()
 196                 {
 197                         string host = UserHostName;
 198                         if (version > HttpVersion.Version10 && (host == null || host.Length == 0)) {
 199                                 context.ErrorMessage = "Invalid host name";
 200                                 return;
 201                         }
 202
 203                         string path;
 204                         Uri raw_uri = null;
 205                         if (MaybeUri (raw_url.ToLowerInvariant ()) && Uri.TryCreate (raw_url, UriKind.Absolute, out raw_uri))
 206                                 path = raw_uri.PathAndQuery;
 207                         else
 208                                 path = raw_url;
 209
 210                         if ((host == null || host.Length == 0))
 211                                 host = UserHostAddress;
 212
 213                         if (raw_uri != null)
 214                                 host = raw_uri.Host;
 215
 216                         int colon = host.IndexOf (':');
 217                         if (colon >= 0)
 218                                 host = host.Substring (0, colon);
 219
 220                         string base_uri = String.Format ("{0}://{1}:{2}",
 221                                                                 (IsSecureConnection) ? "https" : "http",
 222                                                                 host, LocalEndPoint.Port);
 223
 224                         if (!Uri.TryCreate (base_uri + path, UriKind.Absolute, out url)){
 225                                 context.ErrorMessage = WebUtility.HtmlEncode ("Invalid url: " + base_uri + path);
 226                                 return;
 227                         }
 228
 229                         CreateQueryString (url.Query);
 230
 231                         // Use reference source HttpListenerRequestUriBuilder to process url.
 232                         // Fixes #29927
 233                         url = HttpListenerRequestUriBuilder.GetRequestUri (raw_url, url.Scheme,
 234                                                                 url.Authority, url.LocalPath, url.Query);
 235
 236                         if (version >= HttpVersion.Version11) {
 237                                 string t_encoding = Headers ["Transfer-Encoding"];
 238                                 is_chunked = (t_encoding != null && String.Compare (t_encoding, "chunked", StringComparison.OrdinalIgnoreCase) == 0);
 239                                 // 'identity' is not valid!
 240                                 if (t_encoding != null && !is_chunked) {
 241                                         context.Connection.SendError (null, 501);
 242                                         return;
 243                                 }
 244                         }
 245
 246                         if (!is_chunked && !cl_set) {
 247                                 if (String.Compare (method, "POST", StringComparison.OrdinalIgnoreCase) == 0 ||
 248                                     String.Compare (method, "PUT", StringComparison.OrdinalIgnoreCase) == 0) {
 249                                         context.Connection.SendError (null, 411);
 250                                         return;
 251                                 }
 252                         }
 253
 254                         if (String.Compare (Headers ["Expect"], "100-continue", StringComparison.OrdinalIgnoreCase) == 0) {
 255                                 ResponseStream output = context.Connection.GetResponseStream ();
 256                                 output.InternalWrite (_100continue, 0, _100continue.Length);
 257                         }
 258                 }
 259
 260                 internal static string Unquote (String str) {
 261                         int start = str.IndexOf ('\"');
 262                         int end = str.LastIndexOf ('\"');
 263                         if (start >= 0 && end >=0)
 264                                 str = str.Substring (start + 1, end - 1);
 265                         return str.Trim ();
 266                 }
 267
 268                 internal void AddHeader (string header)
 269                 {
 270                         int colon = header.IndexOf (':');
 271                         if (colon == -1 || colon == 0) {
 272                                 context.ErrorMessage = "Bad Request";
 273                                 context.ErrorStatus = 400;
 274                                 return;
 275                         }
 276
 277                         string name = header.Substring (0, colon).Trim ();
 278                         string val = header.Substring (colon + 1).Trim ();
 279                         string lower = name.ToLower (CultureInfo.InvariantCulture);
 280                         headers.SetInternal (name, val);
 281                         switch (lower) {
 282                                 case "accept-language":
 283                                         user_languages = val.Split (','); // yes, only split with a ','
 284                                         break;
 285                                 case "accept":
 286                                         accept_types = val.Split (','); // yes, only split with a ','
 287                                         break;
 288                                 case "content-length":
 289                                         try {
 290                                                 //TODO: max. content_length?
 291                                                 content_length = Int64.Parse (val.Trim ());
 292                                                 if (content_length < 0)
 293                                                         context.ErrorMessage = "Invalid Content-Length.";
 294                                                 cl_set = true;
 295                                         } catch {
 296                                                 context.ErrorMessage = "Invalid Content-Length.";
 297                                         }
 298
 299                                         break;
 300                                 case "referer":
 301                                         try {
 302                                                 referrer = new Uri (val);
 303                                         } catch {
 304                                                 referrer = new Uri ("http://someone.is.screwing.with.the.headers.com/");
 305                                         }
 306                                         break;
 307                                 case "cookie":
 308                                         if (cookies == null)
 309                                                 cookies = new CookieCollection();
 310
 311                                         string[] cookieStrings = val.Split(new char[] {',', ';'});
 312                                         Cookie current = null;
 313                                         int version = 0;
 314                                         foreach (string cookieString in cookieStrings) {
 315                                                 string str = cookieString.Trim ();
 316                                                 if (str.Length == 0)
 317                                                         continue;
 318                                                 if (str.StartsWith ("$Version")) {
 319                                                         version = Int32.Parse (Unquote (str.Substring (str.IndexOf ('=') + 1)));
 320                                                 } else if (str.StartsWith ("$Path")) {
 321                                                         if (current != null)
 322                                                                 current.Path = str.Substring (str.IndexOf ('=') + 1).Trim ();
 323                                                 } else if (str.StartsWith ("$Domain")) {
 324                                                         if (current != null)
 325                                                                 current.Domain = str.Substring (str.IndexOf ('=') + 1).Trim ();
 326                                                 } else if (str.StartsWith ("$Port")) {
 327                                                         if (current != null)
 328                                                                 current.Port = str.Substring (str.IndexOf ('=') + 1).Trim ();
 329                                                 } else {
 330                                                         if (current != null) {
 331                                                                 cookies.Add (current);
 332                                                         }
 333                                                         try {
 334                                                                 current = new Cookie ();
 335                                                                 int idx = str.IndexOf ('=');
 336                                                                 if (idx > 0) {
 337                                                                         current.Name = str.Substring (0, idx).Trim ();
 338                                                                         current.Value =  str.Substring (idx + 1).Trim ();
 339                                                                 } else {
 340                                                                         current.Name = str.Trim ();
 341                                                                         current.Value = String.Empty;
 342                                                                 }
 343                                                                 current.Version = version;
 344                                                         } catch (CookieException) {
 345                                                                 current = null;
 346                                                         }
 347                                                 }
 348                                         }
 349                                         if (current != null) {
 350                                                 cookies.Add (current);
 351                                         }
 352                                         break;
 353                         }
 354                 }
 355
 356                 // returns true is the stream could be reused.
 357                 internal bool FlushInput ()
 358                 {
 359                         if (!HasEntityBody)
 360                                 return true;
 361
 362                         int length = 2048;
 363                         if (content_length > 0)
 364                                 length = (int) Math.Min (content_length, (long) length);
 365
 366                         byte [] bytes = new byte [length];
 367                         while (true) {
 368                                 // TODO: test if MS has a timeout when doing this
 369                                 try {
 370                                         IAsyncResult ares = InputStream.BeginRead (bytes, 0, length, null, null);
 371                                         if (!ares.IsCompleted && !ares.AsyncWaitHandle.WaitOne (1000))
 372                                                 return false;
 373                                         if (InputStream.EndRead (ares) <= 0)
 374                                                 return true;
 375                                 } catch (ObjectDisposedException) {
 376                                         input_stream = null;
 377                                         return true;
 378                                 } catch {
 379                                         return false;
 380                                 }
 381                         }
 382                 }
 383
 384                 public string [] AcceptTypes {
 385                         get { return accept_types; }
 386                 }
 387
 388                 public int ClientCertificateError {
 389                         get {
 390                                 HttpConnection cnc = context.Connection;
 391                                 if (cnc.ClientCertificate == null)
 392                                         throw new InvalidOperationException ("No client certificate");
 393                                 int [] errors = cnc.ClientCertificateErrors;
 394                                 if (errors != null && errors.Length > 0)
 395                                         return errors [0];
 396                                 return 0;
 397                         }
 398                 }
 399
 400                 public Encoding ContentEncoding {
 401                         get {
 402                                 if (content_encoding == null)
 403                                         content_encoding = Encoding.Default;
 404                                 return content_encoding;
 405                         }
 406                 }
 407
 408                 public long ContentLength64 {
 409                         get { return is_chunked ? -1 : content_length; }
 410                 }
 411
 412                 public string ContentType {
 413                         get { return headers ["content-type"]; }
 414                 }
 415
 416                 public CookieCollection Cookies {
 417                         get {
 418                                 // TODO: check if the collection is read-only
 419                                 if (cookies == null)
 420                                         cookies = new CookieCollection ();
 421                                 return cookies;
 422                         }
 423                 }
 424
 425                 public bool HasEntityBody {
 426                         get { return (content_length > 0 || is_chunked); }
 427                 }
 428
 429                 public NameValueCollection Headers {
 430                         get { return headers; }
 431                 }
 432
 433                 public string HttpMethod {
 434                         get { return method; }
 435                 }
 436
 437                 public Stream InputStream {
 438                         get {
 439                                 if (input_stream == null) {
 440                                         if (is_chunked || content_length > 0)
 441                                                 input_stream = context.Connection.GetRequestStream (is_chunked, content_length);
 442                                         else
 443                                                 input_stream = Stream.Null;
 444                                 }
 445
 446                                 return input_stream;
 447                         }
 448                 }
 449
 450                 [MonoTODO ("Always returns false")]
 451                 public bool IsAuthenticated {
 452                         get { return false; }
 453                 }
 454
 455                 public bool IsLocal {
 456                         get { return LocalEndPoint.Address.Equals (RemoteEndPoint.Address); }
 457                 }
 458
 459                 public bool IsSecureConnection {
 460                         get { return context.Connection.IsSecure; }
 461                 }
 462
 463                 public bool KeepAlive {
 464                         get {
 465                                 if (ka_set)
 466                                         return keep_alive;
 467
 468                                 ka_set = true;
 469                                 // 1. Connection header
 470                                 // 2. Protocol (1.1 == keep-alive by default)
 471                                 // 3. Keep-Alive header
 472                                 string cnc = headers ["Connection"];
 473                                 if (!String.IsNullOrEmpty (cnc)) {
 474                                         keep_alive = (0 == String.Compare (cnc, "keep-alive", StringComparison.OrdinalIgnoreCase));
 475                                 } else if (version == HttpVersion.Version11) {
 476                                         keep_alive = true;
 477                                 } else {
 478                                         cnc = headers ["keep-alive"];
 479                                         if (!String.IsNullOrEmpty (cnc))
 480                                                 keep_alive = (0 != String.Compare (cnc, "closed", StringComparison.OrdinalIgnoreCase));
 481                                 }
 482                                 return keep_alive;
 483                         }
 484                 }
 485
 486                 public IPEndPoint LocalEndPoint {
 487                         get { return context.Connection.LocalEndPoint; }
 488                 }
 489
 490                 public Version ProtocolVersion {
 491                         get { return version; }
 492                 }
 493
 494                 public NameValueCollection QueryString {
 495                         get { return query_string; }
 496                 }
 497
 498                 public string RawUrl {
 499                         get { return raw_url; }
 500                 }
 501
 502                 public IPEndPoint RemoteEndPoint {
 503                         get { return context.Connection.RemoteEndPoint; }
 504                 }
 505
 506                 [MonoTODO ("Always returns Guid.Empty")]
 507                 public Guid RequestTraceIdentifier {
 508                         get { return Guid.Empty; }
 509                 }
 510
 511                 public Uri Url {
 512                         get { return url; }
 513                 }
 514
 515                 public Uri UrlReferrer {
 516                         get { return referrer; }
 517                 }
 518
 519                 public string UserAgent {
 520                         get { return headers ["user-agent"]; }
 521                 }
 522
 523                 public string UserHostAddress {
 524                         get { return LocalEndPoint.ToString (); }
 525                 }
 526
 527                 public string UserHostName {
 528                         get { return headers ["host"]; }
 529                 }
 530
 531                 public string [] UserLanguages {
 532                         get { return user_languages; }
 533                 }
 534
 535                 public IAsyncResult BeginGetClientCertificate (AsyncCallback requestCallback, object state)
 536                 {
 537                         if (gcc_delegate == null)
 538                                 gcc_delegate = new GCCDelegate (GetClientCertificate);
 539                         return gcc_delegate.BeginInvoke (requestCallback, state);
 540                 }
 541
 542                 public X509Certificate2 EndGetClientCertificate (IAsyncResult asyncResult)
 543                 {
 544                         if (asyncResult == null)
 545                                 throw new ArgumentNullException ("asyncResult");
 546
 547                         if (gcc_delegate == null)
 548                                 throw new InvalidOperationException ();
 549
 550                         return gcc_delegate.EndInvoke (asyncResult);
 551                 }
 552
 553                 public X509Certificate2 GetClientCertificate ()
 554                 {
 555                         return context.Connection.ClientCertificate;
 556                 }
 557
 558                 [MonoTODO]
 559                 public string ServiceName {
 560                         get {
 561                                 return null;
 562                         }
 563                 }
 564
 565                 public TransportContext TransportContext {
 566                         get {
 567                                 return new Context ();
 568                         }
 569                 }
 570
 571                 [MonoTODO]
 572                 public bool IsWebSocketRequest {
 573                         get {
 574                                 return false;
 575                         }
 576                 }
 577
 578                 public Task<X509Certificate2> GetClientCertificateAsync ()
 579                 {
 580                         return Task<X509Certificate2>.Factory.FromAsync (BeginGetClientCertificate, EndGetClientCertificate, null);
 581                 }
 582         }
 583 }
 584