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

   1 //
   2 // System.Net.HttpListenerRequest
   3 //
   4 // Authors:
   5 //      Gonzalo Paniagua Javier (gonzalo@novell.com)
   6 //      Marek Safar (marek.safar@gmail.com)
   7 //
   8 // Copyright (c) 2005 Novell, Inc. (http://www.novell.com)
   9 // Copyright 2011 Xamarin Inc.
  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 #if SECURITY_DEP
  32
  33 using System.Collections;
  34 using System.Collections.Specialized;
  35 using System.Globalization;
  36 using System.IO;
  37 using System.Security.Cryptography.X509Certificates;
  38 using System.Text;
  39 #if NET_4_5
  40 using System.Threading.Tasks;
  41 #endif
  42
  43 namespace System.Net {
  44         public sealed class HttpListenerRequest
  45         {
  46                 string [] accept_types;
  47 //              int client_cert_error;
  48 //              bool no_get_certificate;
  49                 Encoding content_encoding;
  50                 long content_length;
  51                 bool cl_set;
  52                 CookieCollection cookies;
  53                 WebHeaderCollection headers;
  54                 string method;
  55                 Stream input_stream;
  56                 Version version;
  57                 NameValueCollection query_string; // check if null is ok, check if read-only, check case-sensitiveness
  58                 string raw_url;
  59                 Uri url;
  60                 Uri referrer;
  61                 string [] user_languages;
  62                 HttpListenerContext context;
  63                 bool is_chunked;
  64                 bool ka_set;
  65                 bool keep_alive;
  66                 static byte [] _100continue = Encoding.ASCII.GetBytes ("HTTP/1.1 100 Continue\r\n\r\n");
  67
  68                 internal HttpListenerRequest (HttpListenerContext context)
  69                 {
  70                         this.context = context;
  71                         headers = new WebHeaderCollection ();
  72                         version = HttpVersion.Version10;
  73                 }
  74
  75                 static char [] separators = new char [] { ' ' };
  76
  77                 internal void SetRequestLine (string req)
  78                 {
  79                         string [] parts = req.Split (separators, 3);
  80                         if (parts.Length != 3) {
  81                                 context.ErrorMessage = "Invalid request line (parts).";
  82                                 return;
  83                         }
  84
  85                         method = parts [0];
  86                         foreach (char c in method){
  87                                 int ic = (int) c;
  88
  89                                 if ((ic >= 'A' && ic <= 'Z') ||
  90                                     (ic > 32 && c < 127 && c != '(' && c != ')' && c != '<' &&
  91                                      c != '<' && c != '>' && c != '@' && c != ',' && c != ';' &&
  92                                      c != ':' && c != '\\' && c != '"' && c != '/' && c != '[' &&
  93                                      c != ']' && c != '?' && c != '=' && c != '{' && c != '}'))
  94                                         continue;
  95
  96                                 context.ErrorMessage = "(Invalid verb)";
  97                                 return;
  98                         }
  99
 100                         raw_url = parts [1];
 101                         if (parts [2].Length != 8 || !parts [2].StartsWith ("HTTP/")) {
 102                                 context.ErrorMessage = "Invalid request line (version).";
 103                                 return;
 104                         }
 105
 106                         try {
 107                                 version = new Version (parts [2].Substring (5));
 108                                 if (version.Major < 1)
 109                                         throw new Exception ();
 110                         } catch {
 111                                 context.ErrorMessage = "Invalid request line (version).";
 112                                 return;
 113                         }
 114                 }
 115
 116                 void CreateQueryString (string query)
 117                 {
 118                         if (query == null || query.Length == 0) {
 119                                 query_string = new NameValueCollection (1);
 120                                 return;
 121                         }
 122
 123                         query_string = new NameValueCollection ();
 124                         if (query [0] == '?')
 125                                 query = query.Substring (1);
 126                         string [] components = query.Split ('&');
 127                         foreach (string kv in components) {
 128                                 int pos = kv.IndexOf ('=');
 129                                 if (pos == -1) {
 130                                         query_string.Add (null, HttpUtility.UrlDecode (kv));
 131                                 } else {
 132                                         string key = HttpUtility.UrlDecode (kv.Substring (0, pos));
 133                                         string val = HttpUtility.UrlDecode (kv.Substring (pos + 1));
 134
 135                                         query_string.Add (key, val);
 136                                 }
 137                         }
 138                 }
 139
 140                 internal void FinishInitialization ()
 141                 {
 142                         string host = UserHostName;
 143                         if (version > HttpVersion.Version10 && (host == null || host.Length == 0)) {
 144                                 context.ErrorMessage = "Invalid host name";
 145                                 return;
 146                         }
 147
 148                         string path;
 149                         Uri raw_uri = null;
 150                         if (Uri.MaybeUri (raw_url) && Uri.TryCreate (raw_url, UriKind.Absolute, out raw_uri))
 151                                 path = raw_uri.PathAndQuery;
 152                         else
 153                                 path = HttpUtility.UrlDecode (raw_url);
 154
 155                         if ((host == null || host.Length == 0))
 156                                 host = UserHostAddress;
 157
 158                         if (raw_uri != null)
 159                                 host = raw_uri.Host;
 160
 161                         int colon = host.IndexOf (':');
 162                         if (colon >= 0)
 163                                 host = host.Substring (0, colon);
 164
 165                         string base_uri = String.Format ("{0}://{1}:{2}",
 166                                                                 (IsSecureConnection) ? "https" : "http",
 167                                                                 host, LocalEndPoint.Port);
 168
 169                         if (!Uri.TryCreate (base_uri + path, UriKind.Absolute, out url)){
 170                                 context.ErrorMessage = "Invalid url: " + base_uri + path;
 171                                 return;
 172                         }
 173
 174                         CreateQueryString (url.Query);
 175
 176                         if (version >= HttpVersion.Version11) {
 177                                 string t_encoding = Headers ["Transfer-Encoding"];
 178                                 is_chunked = (t_encoding != null && String.Compare (t_encoding, "chunked", StringComparison.OrdinalIgnoreCase) == 0);
 179                                 // 'identity' is not valid!
 180                                 if (t_encoding != null && !is_chunked) {
 181                                         context.Connection.SendError (null, 501);
 182                                         return;
 183                                 }
 184                         }
 185
 186                         if (!is_chunked && !cl_set) {
 187                                 if (String.Compare (method, "POST", StringComparison.OrdinalIgnoreCase) == 0 ||
 188                                     String.Compare (method, "PUT", StringComparison.OrdinalIgnoreCase) == 0) {
 189                                         context.Connection.SendError (null, 411);
 190                                         return;
 191                                 }
 192                         }
 193
 194                         if (String.Compare (Headers ["Expect"], "100-continue", StringComparison.OrdinalIgnoreCase) == 0) {
 195                                 ResponseStream output = context.Connection.GetResponseStream ();
 196                                 output.InternalWrite (_100continue, 0, _100continue.Length);
 197                         }
 198                 }
 199
 200                 internal static string Unquote (String str) {
 201                         int start = str.IndexOf ('\"');
 202                         int end = str.LastIndexOf ('\"');
 203                         if (start >= 0 && end >=0)
 204                                 str = str.Substring (start + 1, end - 1);
 205                         return str.Trim ();
 206                 }
 207
 208                 internal void AddHeader (string header)
 209                 {
 210                         int colon = header.IndexOf (':');
 211                         if (colon == -1 || colon == 0) {
 212                                 context.ErrorMessage = "Bad Request";
 213                                 context.ErrorStatus = 400;
 214                                 return;
 215                         }
 216
 217                         string name = header.Substring (0, colon).Trim ();
 218                         string val = header.Substring (colon + 1).Trim ();
 219                         string lower = name.ToLower (CultureInfo.InvariantCulture);
 220                         headers.SetInternal (name, val);
 221                         switch (lower) {
 222                                 case "accept-language":
 223                                         user_languages = val.Split (','); // yes, only split with a ','
 224                                         break;
 225                                 case "accept":
 226                                         accept_types = val.Split (','); // yes, only split with a ','
 227                                         break;
 228                                 case "content-length":
 229                                         try {
 230                                                 //TODO: max. content_length?
 231                                                 content_length = Int64.Parse (val.Trim ());
 232                                                 if (content_length < 0)
 233                                                         context.ErrorMessage = "Invalid Content-Length.";
 234                                                 cl_set = true;
 235                                         } catch {
 236                                                 context.ErrorMessage = "Invalid Content-Length.";
 237                                         }
 238
 239                                         break;
 240                                 case "referer":
 241                                         try {
 242                                                 referrer = new Uri (val);
 243                                         } catch {
 244                                                 referrer = new Uri ("http://someone.is.screwing.with.the.headers.com/");
 245                                         }
 246                                         break;
 247                                 case "cookie":
 248                                         if (cookies == null)
 249                                                 cookies = new CookieCollection();
 250
 251                                         string[] cookieStrings = val.Split(new char[] {',', ';'});
 252                                         Cookie current = null;
 253                                         int version = 0;
 254                                         foreach (string cookieString in cookieStrings) {
 255                                                 string str = cookieString.Trim ();
 256                                                 if (str.Length == 0)
 257                                                         continue;
 258                                                 if (str.StartsWith ("$Version")) {
 259                                                         version = Int32.Parse (Unquote (str.Substring (str.IndexOf ('=') + 1)));
 260                                                 } else if (str.StartsWith ("$Path")) {
 261                                                         if (current != null)
 262                                                                 current.Path = str.Substring (str.IndexOf ('=') + 1).Trim ();
 263                                                 } else if (str.StartsWith ("$Domain")) {
 264                                                         if (current != null)
 265                                                                 current.Domain = str.Substring (str.IndexOf ('=') + 1).Trim ();
 266                                                 } else if (str.StartsWith ("$Port")) {
 267                                                         if (current != null)
 268                                                                 current.Port = str.Substring (str.IndexOf ('=') + 1).Trim ();
 269                                                 } else {
 270                                                         if (current != null) {
 271                                                                 cookies.Add (current);
 272                                                         }
 273                                                         current = new Cookie ();
 274                                                         int idx = str.IndexOf ('=');
 275                                                         if (idx > 0) {
 276                                                                 current.Name = str.Substring (0, idx).Trim ();
 277                                                                 current.Value =  str.Substring (idx + 1).Trim ();
 278                                                         } else {
 279                                                                 current.Name = str.Trim ();
 280                                                                 current.Value = String.Empty;
 281                                                         }
 282                                                         current.Version = version;
 283                                                 }
 284                                         }
 285                                         if (current != null) {
 286                                                 cookies.Add (current);
 287                                         }
 288                                         break;
 289                         }
 290                 }
 291
 292                 // returns true is the stream could be reused.
 293                 internal bool FlushInput ()
 294                 {
 295                         if (!HasEntityBody)
 296                                 return true;
 297
 298                         int length = 2048;
 299                         if (content_length > 0)
 300                                 length = (int) Math.Min (content_length, (long) length);
 301
 302                         byte [] bytes = new byte [length];
 303                         while (true) {
 304                                 // TODO: test if MS has a timeout when doing this
 305                                 try {
 306                                         IAsyncResult ares = InputStream.BeginRead (bytes, 0, length, null, null);
 307                                         if (!ares.IsCompleted && !ares.AsyncWaitHandle.WaitOne (100))
 308                                                 return false;
 309                                         if (InputStream.EndRead (ares) <= 0)
 310                                                 return true;
 311                                 } catch {
 312                                         return false;
 313                                 }
 314                         }
 315                 }
 316
 317                 public string [] AcceptTypes {
 318                         get { return accept_types; }
 319                 }
 320
 321                 [MonoTODO ("Always returns 0")]
 322                 public int ClientCertificateError {
 323                         get {
 324 /*
 325                                 if (no_get_certificate)
 326                                         throw new InvalidOperationException (
 327                                                 "Call GetClientCertificate() before calling this method.");
 328                                 return client_cert_error;
 329 */
 330                                 return 0;
 331                         }
 332                 }
 333
 334                 public Encoding ContentEncoding {
 335                         get {
 336                                 if (content_encoding == null)
 337                                         content_encoding = Encoding.Default;
 338                                 return content_encoding;
 339                         }
 340                 }
 341
 342                 public long ContentLength64 {
 343                         get { return content_length; }
 344                 }
 345
 346                 public string ContentType {
 347                         get { return headers ["content-type"]; }
 348                 }
 349
 350                 public CookieCollection Cookies {
 351                         get {
 352                                 // TODO: check if the collection is read-only
 353                                 if (cookies == null)
 354                                         cookies = new CookieCollection ();
 355                                 return cookies;
 356                         }
 357                 }
 358
 359                 public bool HasEntityBody {
 360                         get { return (content_length > 0 || is_chunked); }
 361                 }
 362
 363                 public NameValueCollection Headers {
 364                         get { return headers; }
 365                 }
 366
 367                 public string HttpMethod {
 368                         get { return method; }
 369                 }
 370
 371                 public Stream InputStream {
 372                         get {
 373                                 if (input_stream == null) {
 374                                         if (is_chunked || content_length > 0)
 375                                                 input_stream = context.Connection.GetRequestStream (is_chunked, content_length);
 376                                         else
 377                                                 input_stream = Stream.Null;
 378                                 }
 379
 380                                 return input_stream;
 381                         }
 382                 }
 383
 384                 [MonoTODO ("Always returns false")]
 385                 public bool IsAuthenticated {
 386                         get { return false; }
 387                 }
 388
 389                 public bool IsLocal {
 390                         get { return IPAddress.IsLoopback (RemoteEndPoint.Address); }
 391                 }
 392
 393                 public bool IsSecureConnection {
 394                         get { return context.Connection.IsSecure; }
 395                 }
 396
 397                 public bool KeepAlive {
 398                         get {
 399                                 if (ka_set)
 400                                         return keep_alive;
 401
 402                                 ka_set = true;
 403                                 // 1. Connection header
 404                                 // 2. Protocol (1.1 == keep-alive by default)
 405                                 // 3. Keep-Alive header
 406                                 string cnc = headers ["Connection"];
 407                                 if (!String.IsNullOrEmpty (cnc)) {
 408                                         keep_alive = (0 == String.Compare (cnc, "keep-alive", StringComparison.OrdinalIgnoreCase));
 409                                 } else if (version == HttpVersion.Version11) {
 410                                         keep_alive = true;
 411                                 } else {
 412                                         cnc = headers ["keep-alive"];
 413                                         if (!String.IsNullOrEmpty (cnc))
 414                                                 keep_alive = (0 != String.Compare (cnc, "closed", StringComparison.OrdinalIgnoreCase));
 415                                 }
 416                                 return keep_alive;
 417                         }
 418                 }
 419
 420                 public IPEndPoint LocalEndPoint {
 421                         get { return context.Connection.LocalEndPoint; }
 422                 }
 423
 424                 public Version ProtocolVersion {
 425                         get { return version; }
 426                 }
 427
 428                 public NameValueCollection QueryString {
 429                         get { return query_string; }
 430                 }
 431
 432                 public string RawUrl {
 433                         get { return raw_url; }
 434                 }
 435
 436                 public IPEndPoint RemoteEndPoint {
 437                         get { return context.Connection.RemoteEndPoint; }
 438                 }
 439
 440                 [MonoTODO ("Always returns Guid.Empty")]
 441                 public Guid RequestTraceIdentifier {
 442                         get { return Guid.Empty; }
 443                 }
 444
 445                 public Uri Url {
 446                         get { return url; }
 447                 }
 448
 449                 public Uri UrlReferrer {
 450                         get { return referrer; }
 451                 }
 452
 453                 public string UserAgent {
 454                         get { return headers ["user-agent"]; }
 455                 }
 456
 457                 public string UserHostAddress {
 458                         get { return LocalEndPoint.ToString (); }
 459                 }
 460
 461                 public string UserHostName {
 462                         get { return headers ["host"]; }
 463                 }
 464
 465                 public string [] UserLanguages {
 466                         get { return user_languages; }
 467                 }
 468
 469                 [MonoTODO]
 470                 public IAsyncResult BeginGetClientCertificate (AsyncCallback requestCallback, object state)
 471                 {
 472                         throw new NotImplementedException ();
 473                 }
 474
 475                 [MonoTODO]
 476                 public X509Certificate2 EndGetClientCertificate (IAsyncResult asyncResult)
 477                 {
 478                         throw new NotImplementedException ();
 479                 }
 480
 481                 public X509Certificate2 GetClientCertificate ()
 482                 {
 483                         // set no_client_certificate once done.
 484
 485                         // InvalidOp if call in progress.
 486                         return null;
 487                 }
 488
 489 #if NET_4_5
 490                 public Task<X509Certificate2> GetClientCertificateAsync ()
 491                 {
 492                         return Task<X509Certificate2>.Factory.FromAsync (BeginGetClientCertificate, EndGetClientCertificate, null);
 493                 }
 494 #endif
 495         }
 496 }
 497 #endif
 498