mcs/class/System.Web/System.Web/HttpResponse.cs

   1 //
   2 // System.Web.HttpResponse.cs
   3 //
   4 //
   5 // Author:
   6 //      Miguel de Icaza (miguel@novell.com)
   7 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   8 //      Marek Habersack <mhabersack@novell.com>
   9 //
  10 // Copyright (C) 2005-2010 Novell, Inc (http://www.novell.com)
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32 using System.Text;
  33 using System.Web.UI;
  34 using System.Collections;
  35 using System.Collections.Specialized;
  36 using System.IO;
  37 using System.Web.Caching;
  38 using System.Threading;
  39 using System.Web.Util;
  40 using System.Web.Configuration;
  41 using System.Globalization;
  42 using System.Security.Permissions;
  43 using System.Web.Hosting;
  44 using System.Web.SessionState;
  45
  46 using System.Web.Routing;
  47
  48 namespace System.Web
  49 {
  50         // CAS - no InheritanceDemand here as the class is sealed
  51         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  52         public sealed partial class HttpResponse
  53         {
  54                 internal HttpWorkerRequest WorkerRequest;
  55                 internal HttpResponseStream output_stream;
  56                 internal bool buffer = true;
  57
  58                 ArrayList fileDependencies;
  59
  60                 HttpContext context;
  61                 TextWriter writer;
  62                 HttpCachePolicy cache_policy;
  63                 Encoding encoding;
  64                 HttpCookieCollection cookies;
  65
  66                 int status_code = 200;
  67                 string status_description = "OK";
  68
  69                 string content_type = "text/html";
  70                 string charset;
  71                 bool charset_set;
  72                 CachedRawResponse cached_response;
  73                 string user_cache_control = "private";
  74                 string redirect_location;
  75                 string version_header;
  76                 bool version_header_checked;
  77
  78                 //
  79                 // Negative Content-Length means we auto-compute the size of content-length
  80                 // can be overwritten with AppendHeader ("Content-Length", value)
  81                 //
  82                 long content_length = -1;
  83
  84                 //
  85                 // The list of the headers that we will send back to the client, except
  86                 // the headers that we compute here.
  87                 //
  88
  89                 HttpHeaderCollection headers;
  90                 bool headers_sent;
  91                 NameValueCollection cached_headers;
  92
  93                 //
  94                 // Transfer encoding state
  95                 //
  96                 string transfer_encoding;
  97                 internal bool use_chunked;
  98
  99                 bool closed;
 100                 bool completed;
 101                 internal bool suppress_content;
 102
 103                 //
 104                 // Session State
 105                 //
 106                 string app_path_mod;
 107                 bool is_request_being_redirected;
 108                 Encoding headerEncoding;
 109
 110                 internal HttpResponse ()
 111                 {
 112                         output_stream = new HttpResponseStream (this);
 113                         writer = new HttpWriter (this);
 114                 }
 115
 116                 public HttpResponse (TextWriter writer) : this ()
 117                 {
 118
 119                         this.writer = writer;
 120                 }
 121
 122                 internal HttpResponse (HttpWorkerRequest worker_request, HttpContext context) : this ()
 123                 {
 124                         WorkerRequest = worker_request;
 125                         this.context = context;
 126
 127                         if (worker_request != null && worker_request.GetHttpVersion () == "HTTP/1.1") {
 128                                 string gi = worker_request.GetServerVariable ("GATEWAY_INTERFACE");
 129                                 use_chunked = (String.IsNullOrEmpty (gi) ||
 130                                         !gi.StartsWith ("cgi", StringComparison.OrdinalIgnoreCase));
 131                         } else {
 132                                 use_chunked = false;
 133                         }
 134                         writer = new HttpWriter (this);
 135                 }
 136
 137                 internal TextWriter SetTextWriter (TextWriter writer)
 138                 {
 139                         TextWriter prev = this.writer;
 140                         this.writer = writer;
 141                         return prev;
 142                 }
 143
 144                 internal string VersionHeader {
 145                         get {
 146                                 if (!version_header_checked && version_header == null) {
 147                                         version_header_checked = true;
 148                                         HttpRuntimeSection config = HttpRuntime.Section;
 149                                         if (config != null && config.EnableVersionHeader)
 150                                                 version_header = Environment.Version.ToString (3);
 151                                 }
 152
 153                                 return version_header;
 154                         }
 155                 }
 156
 157                 internal HttpContext Context {
 158                         get { return context; }
 159                         set { context = value; }
 160                 }
 161
 162                 internal string[] FileDependencies {
 163                         get {
 164                                 if (fileDependencies == null || fileDependencies.Count == 0)
 165                                         return new string[0] {};
 166                                 return (string[]) fileDependencies.ToArray (typeof (string));
 167                         }
 168                 }
 169
 170                 ArrayList FileDependenciesArray {
 171                         get {
 172                                 if (fileDependencies == null)
 173                                         fileDependencies = new ArrayList ();
 174                                 return fileDependencies;
 175                         }
 176                 }
 177
 178                 public bool Buffer {
 179                         get {
 180                                 return buffer;
 181                         }
 182
 183                         set {
 184                                 buffer = value;
 185                         }
 186                 }
 187
 188                 public bool BufferOutput {
 189                         get {
 190                                 return buffer;
 191                         }
 192
 193                         set {
 194                                 buffer = value;
 195                         }
 196                 }
 197
 198                 //
 199                 // Use the default from <globalization> section if the client has not set the encoding
 200                 //
 201                 public Encoding ContentEncoding {
 202                         get {
 203                                 if (encoding == null) {
 204                                         if (context != null) {
 205                                                 string client_content_type = context.Request.ContentType;
 206                                                 string parameter = HttpRequest.GetParameter (client_content_type, "; charset=");
 207                                                 if (parameter != null) {
 208                                                         try {
 209                                                                 // Do what the #1 web server does
 210                                                                 encoding = Encoding.GetEncoding (parameter);
 211                                                         } catch {
 212                                                         }
 213                                                 }
 214                                         }
 215                                         if (encoding == null)
 216                                                 encoding = WebEncoding.ResponseEncoding;
 217                                 }
 218                                 return encoding;
 219                         }
 220
 221                         set {
 222                                 if (value == null)
 223                                         throw new ArgumentException ("ContentEncoding can not be null");
 224
 225                                 encoding = value;
 226                                 HttpWriter http_writer = writer as HttpWriter;
 227                                 if (http_writer != null)
 228                                         http_writer.SetEncoding (encoding);
 229                         }
 230                 }
 231
 232                 public string ContentType {
 233                         get {
 234                                 return content_type;
 235                         }
 236
 237                         set {
 238                                 content_type = value;
 239                         }
 240                 }
 241
 242                 public string Charset {
 243                         get {
 244                                 if (charset == null)
 245                                         charset = ContentEncoding.WebName;
 246
 247                                 return charset;
 248                         }
 249
 250                         set {
 251                                 charset_set = true;
 252                                 charset = value;
 253                         }
 254                 }
 255
 256                 public HttpCookieCollection Cookies {
 257                         get {
 258                                 if (cookies == null)
 259                                         cookies = new HttpCookieCollection (true, false);
 260                                 return cookies;
 261                         }
 262                 }
 263
 264                 public int Expires {
 265                         get {
 266                                 if (cache_policy == null)
 267                                         return 0;
 268
 269                                 return cache_policy.ExpireMinutes ();
 270                         }
 271
 272                         set {
 273                                 Cache.SetExpires (DateTime.Now + new TimeSpan (0, value, 0));
 274                         }
 275                 }
 276
 277                 public DateTime ExpiresAbsolute {
 278                         get {
 279                                 return Cache.Expires;
 280                         }
 281
 282                         set {
 283                                 Cache.SetExpires (value);
 284                         }
 285                 }
 286
 287                 public Stream Filter {
 288                         get {
 289                                 if (WorkerRequest == null)
 290                                         return null;
 291
 292                                 return output_stream.Filter;
 293                         }
 294
 295                         set {
 296                                 output_stream.Filter = value;
 297                         }
 298                 }
 299
 300                 public Encoding HeaderEncoding {
 301                         get {
 302                                 if (headerEncoding == null) {
 303                                         GlobalizationSection gs = WebConfigurationManager.SafeGetSection ("system.web/globalization", typeof (GlobalizationSection)) as GlobalizationSection;
 304
 305                                         if (gs == null)
 306                                                 headerEncoding = Encoding.UTF8;
 307                                         else {
 308                                                 headerEncoding = gs.ResponseHeaderEncoding;
 309                                                 if (headerEncoding == Encoding.Unicode)
 310                                                         throw new HttpException ("HeaderEncoding must not be Unicode");
 311                                         }
 312                                 }
 313                                 return headerEncoding;
 314                         }
 315                         set {
 316                                 if (headers_sent)
 317                                         throw new HttpException ("headers have already been sent");
 318                                 if (value == null)
 319                                         throw new ArgumentNullException ("HeaderEncoding");
 320                                 if (value == Encoding.Unicode)
 321                                         throw new HttpException ("HeaderEncoding must not be Unicode");
 322                                 headerEncoding = value;
 323                         }
 324                 }
 325
 326                 public NameValueCollection Headers {
 327                         get {
 328                                 if (headers == null)
 329                                         headers = new HttpHeaderCollection ();
 330
 331                                 return headers;
 332                         }
 333                 }
 334
 335
 336                 public bool IsClientConnected {
 337                         get {
 338                                 if (WorkerRequest == null)
 339                                         return true; // yep that's true
 340
 341                                 return WorkerRequest.IsClientConnected ();
 342                         }
 343                 }
 344
 345                 public bool IsRequestBeingRedirected {
 346                         get { return is_request_being_redirected; }
 347                 }
 348
 349                 public TextWriter Output {
 350                         get {
 351                                 return writer;
 352                         }
 353                         set { writer = value; }
 354                 }
 355
 356                 public Stream OutputStream {
 357                         get {
 358                                 return output_stream;
 359                         }
 360                 }
 361
 362                 public string RedirectLocation {
 363                         get {
 364                                 return redirect_location;
 365                         }
 366
 367                         set {
 368                                 redirect_location = value;
 369                         }
 370                 }
 371
 372                 public string Status {
 373                         get { return String.Concat (status_code.ToString (), " ", StatusDescription); }
 374
 375                         set {
 376                                 int p = value.IndexOf (' ');
 377                                 if (p == -1)
 378                                         throw new HttpException ("Invalid format for the Status property");
 379
 380                                 string s = value.Substring (0, p);
 381
 382                                 if (!Int32.TryParse (s, out status_code))
 383                                         throw new HttpException ("Invalid format for the Status property");
 384
 385                                 status_description = value.Substring (p+1);
 386                         }
 387                 }
 388
 389                 // We ignore the two properties on Mono as they are for use with IIS7, but there is
 390                 // no point in throwing PlatformNotSupportedException. We might find a use for them
 391                 // some day.
 392                 public int SubStatusCode {
 393                         get;
 394                         set;
 395                 }
 396
 397                 public bool SuppressFormsAuthenticationRedirect {
 398                         get;
 399                         set;
 400                 }
 401
 402                 public bool TrySkipIisCustomErrors {
 403                         get;
 404                         set;
 405                 }
 406
 407                 public int StatusCode {
 408                         get {
 409                                 return status_code;
 410                         }
 411
 412                         set {
 413                                 if (headers_sent)
 414                                         throw new HttpException ("headers have already been sent");
 415
 416                                 status_code = value;
 417                                 status_description = null;
 418                         }
 419                 }
 420
 421                 public string StatusDescription {
 422                         get {
 423                                 if (status_description == null)
 424                                         status_description = HttpWorkerRequest.GetStatusDescription (status_code);
 425
 426                                 return status_description;
 427                         }
 428
 429                         set {
 430                                 if (headers_sent)
 431                                         throw new HttpException ("headers have already been sent");
 432
 433                                 status_description = value;
 434                         }
 435                 }
 436
 437                 public bool SuppressContent {
 438                         get {
 439                                 return suppress_content;
 440                         }
 441
 442                         set {
 443                                 suppress_content = value;
 444                         }
 445                 }
 446
 447                 [MonoTODO ("Not implemented")]
 448                 public void AddCacheDependency (params CacheDependency[] dependencies)
 449                 {
 450                         throw new NotImplementedException ();
 451                 }
 452
 453                 [MonoTODO ("Not implemented")]
 454                 public void AddCacheItemDependencies (string[] cacheKeys)
 455                 {
 456                         throw new NotImplementedException ();
 457                 }
 458
 459                 [MonoTODO("Currently does nothing")]
 460                 public void AddCacheItemDependencies (ArrayList cacheKeys)
 461                 {
 462                         // TODO: talk to jackson about the cache
 463                 }
 464
 465                 [MonoTODO("Currently does nothing")]
 466                 public void AddCacheItemDependency (string cacheKey)
 467                 {
 468                         // TODO: talk to jackson about the cache
 469                 }
 470
 471                 public void AddFileDependencies (ArrayList filenames)
 472                 {
 473                         if (filenames == null || filenames.Count == 0)
 474                                 return;
 475                         FileDependenciesArray.AddRange (filenames);
 476                 }
 477
 478                 public void AddFileDependencies (string[] filenames)
 479                 {
 480                         if (filenames == null || filenames.Length == 0)
 481                                 return;
 482                         FileDependenciesArray.AddRange (filenames);
 483                 }
 484
 485                 public void AddFileDependency (string filename)
 486                 {
 487                         if (filename == null || filename == String.Empty)
 488                                 return;
 489                         FileDependenciesArray.Add (filename);
 490                 }
 491
 492                 public void AddHeader (string name, string value)
 493                 {
 494                         AppendHeader (name, value);
 495                 }
 496
 497                 public void AppendCookie (HttpCookie cookie)
 498                 {
 499                         Cookies.Add (cookie);
 500                 }
 501
 502                 //
 503                 // AppendHeader:
 504                 //    Special case for Content-Length, Content-Type, Transfer-Encoding and Cache-Control
 505                 //
 506                 //
 507                 public void AppendHeader (string name, string value)
 508                 {
 509                         if (headers_sent)
 510                                 throw new HttpException ("Headers have been already sent");
 511                         if (String.Compare (name, "content-length", StringComparison.OrdinalIgnoreCase) == 0){
 512                                 content_length = (long) UInt64.Parse (value);
 513                                 use_chunked = false;
 514                                 return;
 515                         }
 516
 517                         if (String.Compare (name, "content-type", StringComparison.OrdinalIgnoreCase) == 0){
 518                                 ContentType = value;
 519                                 return;
 520                         }
 521
 522                         if (String.Compare (name, "transfer-encoding", StringComparison.OrdinalIgnoreCase) == 0){
 523                                 transfer_encoding = value;
 524                                 use_chunked = false;
 525                                 return;
 526                         }
 527
 528                         if (String.Compare (name, "cache-control", StringComparison.OrdinalIgnoreCase) == 0){
 529                                 user_cache_control = value;
 530                                 return;
 531                         }
 532
 533                         Headers.Add (name, value);
 534                 }
 535
 536                 [AspNetHostingPermission (SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Medium)]
 537                 public void AppendToLog (string param)
 538                 {
 539                         Console.Write ("System.Web: ");
 540                         Console.WriteLine (param);
 541                 }
 542
 543                 public string ApplyAppPathModifier (string virtualPath)
 544                 {
 545                         if (virtualPath == null || context == null)
 546                                 return null;
 547
 548                         if (virtualPath.Length == 0)
 549                                 return context.Request.RootVirtualDir;
 550
 551                         if (UrlUtils.IsRelativeUrl (virtualPath)) {
 552                                 virtualPath = UrlUtils.Combine (context.Request.RootVirtualDir, virtualPath);
 553                         } else if (UrlUtils.IsRooted (virtualPath)) {
 554                                 virtualPath = UrlUtils.Canonic (virtualPath);
 555                         }
 556
 557                         bool cookieless = false;
 558                         SessionStateSection config = WebConfigurationManager.GetWebApplicationSection ("system.web/sessionState") as SessionStateSection;
 559                         cookieless = SessionStateModule.IsCookieLess (context, config);
 560
 561                         if (!cookieless)
 562                                 return virtualPath;
 563
 564                         if (app_path_mod != null && virtualPath.IndexOf (app_path_mod) < 0) {
 565                                 if (UrlUtils.HasSessionId (virtualPath))
 566                                         virtualPath = UrlUtils.RemoveSessionId (VirtualPathUtility.GetDirectory (virtualPath), virtualPath);
 567                                 return UrlUtils.InsertSessionId (app_path_mod, virtualPath);
 568                         }
 569
 570                         return virtualPath;
 571                 }
 572
 573                 public void BinaryWrite (byte [] buffer)
 574                 {
 575                         output_stream.Write (buffer, 0, buffer.Length);
 576                 }
 577
 578                 internal void BinaryWrite (byte [] buffer, int start, int len)
 579                 {
 580                         output_stream.Write (buffer, start, len);
 581                 }
 582
 583                 public void Clear ()
 584                 {
 585                         ClearContent ();
 586                 }
 587
 588                 public void ClearContent ()
 589                 {
 590                         output_stream.Clear ();
 591                         content_length = -1;
 592                 }
 593
 594                 public void ClearHeaders ()
 595                 {
 596                         if (headers_sent)
 597                                 throw new HttpException ("headers have been already sent");
 598
 599                         // Reset the special case headers.
 600                         content_length = -1;
 601                         content_type = "text/html";
 602                         transfer_encoding = null;
 603                         user_cache_control = "private";
 604                         if (cache_policy != null)
 605                                 cache_policy.Cacheability = HttpCacheability.Private;
 606
 607                         if (headers != null)
 608                                 headers.Clear ();
 609                 }
 610
 611                 internal bool HeadersSent {
 612                         get {
 613                                 return headers_sent;
 614                         }
 615                 }
 616
 617                 public void Close ()
 618                 {
 619                         if (closed)
 620                                 return;
 621                         if (WorkerRequest != null)
 622                                 WorkerRequest.CloseConnection ();
 623                         closed = true;
 624                 }
 625
 626                 public void DisableKernelCache ()
 627                 {
 628                         // does nothing in Mono
 629                 }
 630
 631                 public void End ()
 632                 {
 633                         if (context == null)
 634                                 return;
 635
 636                         if (context.TimeoutPossible) {
 637                                 Thread.CurrentThread.Abort (FlagEnd.Value);
 638                         } else {
 639                                 // If this is called from an async event, signal the completion
 640                                 // but don't throw.
 641                                 HttpApplication app_instance = context.ApplicationInstance;
 642                                 if (app_instance != null)
 643                                         app_instance.CompleteRequest ();
 644                         }
 645                 }
 646
 647                 // Generate:
 648                 //   Content-Length
 649                 //   Content-Type
 650                 //   Transfer-Encoding (chunked)
 651                 //   Cache-Control
 652                 //   X-AspNet-Version
 653                 void AddHeadersNoCache (NameValueCollection write_headers, bool final_flush)
 654                 {
 655                         //
 656                         // Transfer-Encoding
 657                         //
 658                         if (use_chunked)
 659                                 write_headers.Add ("Transfer-Encoding", "chunked");
 660                         else if (transfer_encoding != null)
 661                                 write_headers.Add ("Transfer-Encoding", transfer_encoding);
 662                         if (redirect_location != null)
 663                                 write_headers.Add ("Location", redirect_location);
 664
 665                         string vh = VersionHeader;
 666                         if (vh != null)
 667                                 write_headers.Add ("X-AspNet-Version", vh);
 668
 669                         //
 670                         // If Content-Length is set.
 671                         //
 672                         if (content_length >= 0) {
 673                                 write_headers.Add (HttpWorkerRequest.GetKnownResponseHeaderName (HttpWorkerRequest.HeaderContentLength),
 674                                                    content_length.ToString (Helpers.InvariantCulture));
 675                         } else if (BufferOutput) {
 676                                 if (final_flush) {
 677                                         //
 678                                         // If we are buffering and this is the last flush, not a middle-flush,
 679                                         // we know the content-length.
 680                                         //
 681                                         content_length = output_stream.total;
 682                                         write_headers.Add (HttpWorkerRequest.GetKnownResponseHeaderName (HttpWorkerRequest.HeaderContentLength),
 683                                                            content_length.ToString (Helpers.InvariantCulture));
 684                                 } else {
 685                                         //
 686                                         // We are buffering, and this is a flush in the middle.
 687                                         // If we are not chunked, we need to set "Connection: close".
 688                                         //
 689                                         if (use_chunked){
 690                                                 write_headers.Add (HttpWorkerRequest.GetKnownResponseHeaderName (HttpWorkerRequest.HeaderConnection), "close");
 691                                         }
 692                                 }
 693                         } else {
 694                                 //
 695                                 // If the content-length is not set, and we are not buffering, we must
 696                                 // close at the end.
 697                                 //
 698                                 if (use_chunked){
 699                                         write_headers.Add (HttpWorkerRequest.GetKnownResponseHeaderName (HttpWorkerRequest.HeaderConnection), "close");
 700                                 }
 701                         }
 702
 703                         //
 704                         // Cache Control, the cache policy takes precedence over the cache_control property.
 705                         //
 706                         if (cache_policy != null)
 707                                 cache_policy.SetHeaders (this, headers);
 708                         else
 709                                 write_headers.Add ("Cache-Control", CacheControl);
 710
 711                         //
 712                         // Content-Type
 713                         //
 714                         if (content_type != null){
 715                                 string header = content_type;
 716
 717                                 if (charset_set || header == "text/plain" || header == "text/html") {
 718                                         if (header.IndexOf ("charset=") == -1 && !string.IsNullOrEmpty (charset)) {
 719                                                 header += "; charset=" + charset;
 720                                         }
 721                                 }
 722
 723                                 write_headers.Add ("Content-Type", header);
 724                         }
 725
 726                         if (cookies != null && cookies.Count != 0){
 727                                 int n = cookies.Count;
 728                                 for (int i = 0; i < n; i++)
 729                                         write_headers.Add ("Set-Cookie", cookies.Get (i).GetCookieHeaderValue ());
 730                         }
 731                 }
 732
 733                 internal void WriteHeaders (bool final_flush)
 734                 {
 735                         if (headers_sent)
 736                                 return;
 737
 738                         //
 739                         // Flush
 740                         //
 741                         if (context != null) {
 742                                 HttpApplication app_instance = context.ApplicationInstance;
 743                                 if (app_instance != null)
 744                                         app_instance.TriggerPreSendRequestHeaders ();
 745                         }
 746
 747                         headers_sent = true;
 748
 749                         if (cached_response != null)
 750                                 cached_response.SetHeaders (headers);
 751
 752                         // If this page is cached use the cached headers
 753                         // instead of the standard headers
 754                         NameValueCollection write_headers;
 755                         if (cached_headers != null)
 756                                 write_headers = cached_headers;
 757                         else {
 758                                 write_headers = Headers;
 759                                 AddHeadersNoCache (write_headers, final_flush);
 760                         }
 761
 762                         if (WorkerRequest != null)
 763                                 WorkerRequest.SendStatus (status_code, StatusDescription);
 764
 765                         if (WorkerRequest != null) {
 766                                 string header_name;
 767                                 string[] values;
 768                                 int header_index;
 769
 770                                 for (int i = 0; i < write_headers.Count; i++) {
 771                                         header_name = write_headers.GetKey (i);
 772                                         header_index = HttpWorkerRequest.GetKnownResponseHeaderIndex (header_name);
 773                                         values = write_headers.GetValues (i);
 774                                         if (values == null)
 775                                                 continue;
 776
 777                                         foreach (string val in values) {
 778                                                 if (header_index > -1)
 779                                                         WorkerRequest.SendKnownResponseHeader (header_index, val);
 780                                                 else
 781                                                         WorkerRequest.SendUnknownResponseHeader (header_name, val);
 782                                         }
 783                                 }
 784                         }
 785                 }
 786
 787                 internal void DoFilter (bool close)
 788                 {
 789                         if (output_stream.HaveFilter && context != null && context.Error == null)
 790                                 output_stream.ApplyFilter (close);
 791                 }
 792
 793                 internal void Flush (bool final_flush)
 794                 {
 795                         if (completed)
 796                                 throw new HttpException ("Server cannot flush a completed response");
 797
 798                         DoFilter (final_flush);
 799                         if (!headers_sent){
 800                                 if (final_flush || status_code != 200)
 801                                         use_chunked = false;
 802                         }
 803
 804                         bool head = ((context != null) && (context.Request.HttpMethod == "HEAD"));
 805                         if (suppress_content || head) {
 806                                 if (!headers_sent)
 807                                         WriteHeaders (true);
 808                                 output_stream.Clear ();
 809                                 if (WorkerRequest != null)
 810                                         output_stream.Flush (WorkerRequest, true); // ignore final_flush here.
 811                                 completed = true;
 812                                 return;
 813                         }
 814                         completed = final_flush;
 815
 816                         if (!headers_sent)
 817                                 WriteHeaders (final_flush);
 818
 819                         if (context != null) {
 820                                 HttpApplication app_instance = context.ApplicationInstance;
 821                                 if (app_instance != null)
 822                                         app_instance.TriggerPreSendRequestContent ();
 823                         }
 824
 825                         if (IsCached)
 826                                 cached_response.SetData (output_stream.GetData ());
 827
 828                         if (WorkerRequest != null)
 829                                 output_stream.Flush (WorkerRequest, final_flush);
 830                 }
 831
 832                 public void Flush ()
 833                 {
 834                         Flush (false);
 835                 }
 836
 837                 public void Pics (string value)
 838                 {
 839                         AppendHeader ("PICS-Label", value);
 840                 }
 841
 842                 void Redirect (string url, bool endResponse, int code)
 843                 {
 844                         if (url == null)
 845                                 throw new ArgumentNullException ("url");
 846
 847                         if (headers_sent)
 848                                 throw new HttpException ("Headers have already been sent");
 849
 850                         if (url.IndexOf ('\n') != -1)
 851                                 throw new ArgumentException ("Redirect URI cannot contain newline characters.", "url");
 852
 853                         is_request_being_redirected = true;
 854                         ClearHeaders ();
 855                         ClearContent ();
 856
 857                         StatusCode = code;
 858                         url = ApplyAppPathModifier (url);
 859
 860                         bool isFullyQualified;
 861                         if (StrUtils.StartsWith (url, "http:", true) ||
 862                             StrUtils.StartsWith (url, "https:", true) ||
 863                             StrUtils.StartsWith (url, "file:", true) ||
 864                             StrUtils.StartsWith (url, "ftp:", true))
 865                                 isFullyQualified = true;
 866                         else
 867                                 isFullyQualified = false;
 868
 869                         if (!isFullyQualified) {
 870                                 HttpRuntimeSection config = HttpRuntime.Section;
 871                                 if (config != null && config.UseFullyQualifiedRedirectUrl) {
 872                                         var ub = new UriBuilder (context.Request.Url);
 873                                         int qpos = url.IndexOf ('?');
 874                                         if (qpos == -1) {
 875                                                 ub.Path = url;
 876                                                 ub.Query = null;
 877                                         } else {
 878                                                 ub.Path = url.Substring (0, qpos);
 879                                                 ub.Query = url.Substring (qpos + 1);
 880                                         }
 881                                         ub.Fragment = null;
 882                                         ub.Password = null;
 883                                         ub.UserName = null;
 884                                         url = ub.Uri.ToString ();
 885                                 }
 886                         }
 887
 888                         redirect_location = url;
 889
 890                         // Text for browsers that can't handle location header
 891                         Write ("<html><head><title>Object moved</title></head><body>\r\n");
 892                         Write ("<h2>Object moved to <a href=\"" + url + "\">here</a></h2>\r\n");
 893                         Write ("</body><html>\r\n");
 894
 895                         if (endResponse)
 896                                 End ();
 897                         is_request_being_redirected = false;
 898                 }
 899
 900                 public void Redirect (string url)
 901                 {
 902                         Redirect (url, true);
 903                 }
 904
 905                 public void Redirect (string url, bool endResponse)
 906                 {
 907                         Redirect (url, endResponse, 302);
 908                 }
 909                 public void RedirectPermanent (string url)
 910                 {
 911                         RedirectPermanent (url, true);
 912                 }
 913
 914                 public void RedirectPermanent (string url, bool endResponse)
 915                 {
 916                         Redirect (url, endResponse, 301);
 917                 }
 918
 919                 public void RedirectToRoute (object routeValues)
 920                 {
 921                         RedirectToRoute ("RedirectToRoute", null, new RouteValueDictionary (routeValues), 302, true);
 922                 }
 923
 924                 public void RedirectToRoute (RouteValueDictionary routeValues)
 925                 {
 926                         RedirectToRoute ("RedirectToRoute", null, routeValues, 302, true);
 927                 }
 928
 929                 public void RedirectToRoute (string routeName)
 930                 {
 931                         RedirectToRoute ("RedirectToRoute", routeName, null, 302, true);
 932                 }
 933
 934                 public void RedirectToRoute (string routeName, object routeValues)
 935                 {
 936                         RedirectToRoute ("RedirectToRoute", routeName, new RouteValueDictionary (routeValues), 302, true);
 937                 }
 938
 939                 public void RedirectToRoute (string routeName, RouteValueDictionary routeValues)
 940                 {
 941                         RedirectToRoute ("RedirectToRoute", routeName, routeValues, 302, true);
 942                 }
 943
 944                 public void RedirectToRoutePermanent (object routeValues)
 945                 {
 946                         RedirectToRoute ("RedirectToRoutePermanent", null, new RouteValueDictionary (routeValues), 301, false);
 947                 }
 948
 949                 public void RedirectToRoutePermanent (RouteValueDictionary routeValues)
 950                 {
 951                         RedirectToRoute ("RedirectToRoutePermanent", null, routeValues, 301, false);
 952                 }
 953
 954                 public void RedirectToRoutePermanent (string routeName)
 955                 {
 956                         RedirectToRoute ("RedirectToRoutePermanent", routeName, null, 301, false);
 957                 }
 958
 959                 public void RedirectToRoutePermanent (string routeName, object routeValues)
 960                 {
 961                         RedirectToRoute ("RedirectToRoutePermanent", routeName, new RouteValueDictionary (routeValues), 301, false);
 962                 }
 963
 964                 public void RedirectToRoutePermanent (string routeName, RouteValueDictionary routeValues)
 965                 {
 966                         RedirectToRoute ("RedirectToRoutePermanent", routeName, routeValues, 301, false);
 967                 }
 968
 969                 void RedirectToRoute (string callerName, string routeName, RouteValueDictionary routeValues, int redirectCode, bool endResponse)
 970                 {
 971                         HttpContext ctx = context ?? HttpContext.Current;
 972                         HttpRequest req = ctx != null ? ctx.Request : null;
 973
 974                         if (req == null)
 975                                 // Let's emulate .NET
 976                                 throw new NullReferenceException ();
 977
 978                         VirtualPathData vpd = RouteTable.Routes.GetVirtualPath (req.RequestContext, routeName, routeValues);
 979                         string redirectUrl = vpd != null ? vpd.VirtualPath : null;
 980                         if (String.IsNullOrEmpty (redirectUrl))
 981                                 throw new InvalidOperationException ("No matching route found for RedirectToRoute");
 982
 983                         Redirect (redirectUrl, true, redirectCode);
 984                 }
 985
 986                 public static void RemoveOutputCacheItem (string path, string providerName)
 987                 {
 988                         if (path == null)
 989                                 throw new ArgumentNullException ("path");
 990
 991                         if (path.Length > 0 && path [0] != '/')
 992                                 throw new ArgumentException ("Invalid path for HttpResponse.RemoveOutputCacheItem: '" + path + "'. An absolute virtual path is expected");
 993
 994                         OutputCache.RemoveFromProvider (path, providerName);
 995                 }
 996                 public static void RemoveOutputCacheItem (string path)
 997                 {
 998                         if (path == null)
 999                                 throw new ArgumentNullException ("path");
1000
1001                         if (path.Length == 0)
1002                                 return;
1003
1004                         if (path [0] != '/')
1005                                 throw new ArgumentException ("'" + path + "' is not an absolute virtual path.");
1006
1007                         RemoveOutputCacheItem (path, OutputCache.DefaultProviderName);
1008                 }
1009
1010                 public void SetCookie (HttpCookie cookie)
1011                 {
1012                         AppendCookie (cookie);
1013                 }
1014
1015                 public void Write (char ch)
1016                 {
1017                         TextWriter writer = Output;
1018                         // Emulating .NET
1019                         if (writer == null)
1020                                 throw new NullReferenceException (".NET 4.0 emulation. A null value was found where an object was required.");
1021                         writer.Write (ch);
1022                 }
1023
1024                 public void Write (object obj)
1025                 {
1026                         TextWriter writer = Output;
1027                         // Emulating .NET
1028                         if (writer == null)
1029                                 throw new NullReferenceException (".NET 4.0 emulation. A null value was found where an object was required.");
1030                         if (obj == null)
1031                                 return;
1032
1033                         writer.Write (obj.ToString ());
1034                 }
1035
1036                 public void Write (string s)
1037                 {
1038                         TextWriter writer = Output;
1039                         // Emulating .NET
1040                         if (writer == null)
1041                                 throw new NullReferenceException (".NET 4.0 emulation. A null value was found where an object was required.");
1042                         writer.Write (s);
1043                 }
1044
1045                 public void Write (char [] buffer, int index, int count)
1046                 {
1047                         TextWriter writer = Output;
1048                         // Emulating .NET
1049                         if (writer == null)
1050                                 throw new NullReferenceException (".NET 4.0 emulation. A null value was found where an object was required.");
1051                         writer.Write (buffer, index, count);
1052                 }
1053
1054                 bool IsFileSystemDirSeparator (char ch)
1055                 {
1056                         return ch == '\\' || ch == '/';
1057                 }
1058
1059                 string GetNormalizedFileName (string fn)
1060                 {
1061                         if (String.IsNullOrEmpty (fn))
1062                                 return fn;
1063
1064                         // On Linux we don't change \ to / since filenames with \ are valid. We also
1065                         // don't remove drive: designator for the same reason.
1066                         int len = fn.Length;
1067                         if (len >= 3 && fn [1] == ':' && IsFileSystemDirSeparator (fn [2]))
1068                                 return Path.GetFullPath (fn); // drive-qualified absolute file path
1069
1070                         bool startsWithDirSeparator = IsFileSystemDirSeparator (fn [0]);
1071                         if (len >= 2 && startsWithDirSeparator && IsFileSystemDirSeparator (fn [1]))
1072                                 return Path.GetFullPath (fn); // UNC path
1073
1074                         if (!startsWithDirSeparator) {
1075                                 HttpContext ctx = context ?? HttpContext.Current;
1076                                 HttpRequest req = ctx != null ? ctx.Request : null;
1077
1078                                 if (req != null)
1079                                         return req.MapPath (fn);
1080                         }
1081
1082                         return fn; // Or should we rather throw?
1083                 }
1084
1085                 internal void WriteFile (FileStream fs, long offset, long size)
1086                 {
1087                         byte [] buffer = new byte [32*1024];
1088
1089                         if (offset != 0)
1090                                 fs.Position = offset;
1091
1092                         long remain = size;
1093                         int n;
1094                         while (remain > 0 && (n = fs.Read (buffer, 0, (int) Math.Min (remain, 32*1024))) != 0){
1095                                 remain -= n;
1096                                 output_stream.Write (buffer, 0, n);
1097                         }
1098                 }
1099
1100                 public void WriteFile (string filename)
1101                 {
1102                         WriteFile (filename, false);
1103                 }
1104
1105                 public void WriteFile (string filename, bool readIntoMemory)
1106                 {
1107                         if (filename == null)
1108                                 throw new ArgumentNullException ("filename");
1109
1110                         string fn = GetNormalizedFileName (filename);
1111                         if (readIntoMemory){
1112                                 using (FileStream fs = File.OpenRead (fn))
1113                                         WriteFile (fs, 0, fs.Length);
1114                         } else {
1115                                 FileInfo fi = new FileInfo (fn);
1116                                 output_stream.WriteFile (fn, 0, fi.Length);
1117                         }
1118                         if (buffer)
1119                                 return;
1120
1121                         output_stream.ApplyFilter (false);
1122                         Flush ();
1123                 }
1124
1125                 public void WriteFile (IntPtr fileHandle, long offset, long size)
1126                 {
1127                         if (offset < 0)
1128                                 throw new ArgumentNullException ("offset can not be negative");
1129                         if (size < 0)
1130                                 throw new ArgumentNullException ("size can not be negative");
1131
1132                         if (size == 0)
1133                                 return;
1134
1135                         // Note: this .ctor will throw a SecurityException if the caller
1136                         // doesn't have the UnmanagedCode permission
1137                         using (FileStream fs = new FileStream (fileHandle, FileAccess.Read))
1138                                 WriteFile (fs, offset, size);
1139
1140                         if (buffer)
1141                                 return;
1142                         output_stream.ApplyFilter (false);
1143                         Flush ();
1144                 }
1145
1146                 public void WriteFile (string filename, long offset, long size)
1147                 {
1148                         if (filename == null)
1149                                 throw new ArgumentNullException ("filename");
1150                         if (offset < 0)
1151                                 throw new ArgumentNullException ("offset can not be negative");
1152                         if (size < 0)
1153                                 throw new ArgumentNullException ("size can not be negative");
1154
1155                         if (size == 0)
1156                                 return;
1157
1158                         FileStream fs = File.OpenRead (filename);
1159                         WriteFile (fs, offset, size);
1160
1161                         if (buffer)
1162                                 return;
1163
1164                         output_stream.ApplyFilter (false);
1165                         Flush ();
1166                 }
1167
1168                 public void WriteSubstitution (HttpResponseSubstitutionCallback callback)
1169                 {
1170                         // Emulation of .NET behavior
1171                         if (callback == null)
1172                                 throw new NullReferenceException ();
1173
1174                         object target = callback.Target;
1175                         if (target != null && target.GetType () == typeof (Control))
1176                                 throw new ArgumentException ("callback");
1177
1178                         string s = callback (context);
1179                         if (!IsCached) {
1180                                 Write (s);
1181                                 return;
1182                         }
1183
1184                         Cache.Cacheability = HttpCacheability.Server;
1185                         Flush ();
1186                         if (WorkerRequest == null)
1187                                 Write (s); // better this than nothing
1188                         else {
1189                                 byte[] bytes = WebEncoding.ResponseEncoding.GetBytes (s);
1190                                 WorkerRequest.SendResponseFromMemory (bytes, bytes.Length);
1191                         }
1192
1193                         cached_response.SetData (callback);
1194                 }
1195
1196                 //
1197                 // Like WriteFile, but never buffers, so we manually Flush here
1198                 //
1199                 public void TransmitFile (string filename)
1200                 {
1201                         if (filename == null)
1202                                 throw new ArgumentNullException ("filename");
1203
1204                         TransmitFile (filename, false);
1205                 }
1206
1207                 internal void TransmitFile (string filename, bool final_flush)
1208                 {
1209                         FileInfo fi = new FileInfo (filename);
1210                         using (Stream s = fi.OpenRead ()); // Just check if we can read.
1211                         output_stream.WriteFile (filename, 0, fi.Length);
1212                         output_stream.ApplyFilter (final_flush);
1213                         Flush (final_flush);
1214                 }
1215
1216                 public void TransmitFile (string filename, long offset, long length)
1217                 {
1218                         output_stream.WriteFile (filename, offset, length);
1219                         output_stream.ApplyFilter (false);
1220                         Flush (false);
1221                 }
1222
1223                 internal void TransmitFile (VirtualFile vf)
1224                 {
1225                         TransmitFile (vf, false);
1226                 }
1227
1228                 const int bufLen = 65535;
1229                 internal void TransmitFile (VirtualFile vf, bool final_flush)
1230                 {
1231                         if (vf == null)
1232                                 throw new ArgumentNullException ("vf");
1233
1234                         if (vf is DefaultVirtualFile) {
1235                                 TransmitFile (HostingEnvironment.MapPath (vf.VirtualPath), final_flush);
1236                                 return;
1237                         }
1238
1239                         byte[] buf = new byte [bufLen];
1240                         using (Stream s = vf.Open ()) {
1241                                 int readBytes;
1242                                 while ((readBytes = s.Read (buf, 0, bufLen)) > 0) {
1243                                         output_stream.Write (buf, 0, readBytes);
1244                                         output_stream.ApplyFilter (final_flush);
1245                                         Flush (false);
1246                                 }
1247                                 if (final_flush)
1248                                         Flush (true);
1249                         }
1250                 }
1251
1252 #region Session state support
1253                 internal void SetAppPathModifier (string app_modifier)
1254                 {
1255                         app_path_mod = app_modifier;
1256                 }
1257 #endregion
1258
1259 #region Cache Support
1260                 internal void SetCachedHeaders (NameValueCollection headers)
1261                 {
1262                         cached_headers = headers;
1263
1264                 }
1265
1266                 internal bool IsCached {
1267                         get { return cached_response != null; }
1268                         set {
1269                                 if (value)
1270                                         cached_response = new CachedRawResponse (cache_policy);
1271                                 else
1272                                         cached_response = null;
1273                         }
1274                 }
1275
1276                 public HttpCachePolicy Cache {
1277                         get {
1278                                 if (cache_policy == null)
1279                                         cache_policy = new HttpCachePolicy ();
1280
1281                                 return cache_policy;
1282                         }
1283                 }
1284
1285                 internal CachedRawResponse GetCachedResponse ()
1286                 {
1287                         if (cached_response != null) {
1288                                 cached_response.StatusCode = StatusCode;
1289                                 cached_response.StatusDescription = StatusDescription;
1290                         }
1291
1292                         return cached_response;
1293                 }
1294
1295                 //
1296                 // This is one of the old ASP compatibility methods, the real cache
1297                 // control is in the Cache property, and this is a second class citizen
1298                 //
1299                 public string CacheControl {
1300                         set {
1301                                 if (value == null || value == "") {
1302                                         Cache.SetCacheability (HttpCacheability.NoCache);
1303                                         user_cache_control = null;
1304                                 } else if (String.Compare (value, "public", true, Helpers.InvariantCulture) == 0) {
1305                                         Cache.SetCacheability (HttpCacheability.Public);
1306                                         user_cache_control = "public";
1307                                 } else if (String.Compare (value, "private", true, Helpers.InvariantCulture) == 0) {
1308                                         Cache.SetCacheability (HttpCacheability.Private);
1309                                         user_cache_control = "private";
1310                                 } else if (String.Compare (value, "no-cache", true, Helpers.InvariantCulture) == 0) {
1311                                         Cache.SetCacheability (HttpCacheability.NoCache);
1312                                         user_cache_control = "no-cache";
1313                                 } else
1314                                         throw new ArgumentException ("CacheControl property only allows `public', " +
1315                                                                      "`private' or no-cache, for different uses, use " +
1316                                                                      "Response.AppendHeader");
1317                         }
1318
1319                         get { return (user_cache_control != null) ? user_cache_control : "private"; }
1320                 }
1321 #endregion
1322
1323                 internal int GetOutputByteCount ()
1324                 {
1325                         return output_stream.GetTotalLength ();
1326                 }
1327
1328                 internal void ReleaseResources ()
1329                 {
1330                         if (output_stream != null)
1331                                 output_stream.ReleaseResources (true);
1332                         if (completed)
1333                                 return;
1334
1335                         Close ();
1336                         completed = true;
1337                 }
1338         }
1339
1340         static class FlagEnd
1341         {
1342                 public static readonly object Value = new object ();
1343         }
1344 }
1345