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MultipartRequest.cs

//
// Mono.Tabblo.MultipartRequest
//
// Authors:
//    Gonzalo Paniagua Javier (gonzalo@ximian.com)
//    Stephane Delcroix (stephane@delcroix.org)
//    Wojciech Dzierzanowski (wojciech.dzierzanowski@gmail.com)
//
// (C) Copyright 2006 Novell, Inc. (http://www.novell.com)
// (C) Copyright 2007 S. Delcroix
// (C) Copyright 2009 Wojciech Dzierzanowski
//

// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.Collections;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Net;
using System.Text;

namespace Mono.Tabblo {

      class MultipartRequest {

            private const string VerboseSymbol =
                        "FSPOT_TABBLO_EXPORT_VERBOSE";

            private static readonly byte [] CRLF = { 13, 10 };

            private const string SeparatorString = "PART_SEPARATOR";
            private const string Separator =
                        "--" + SeparatorString + "\r\n";
            private const string SeparatorEnd =
                        "--" + SeparatorString + "--\r\n";

            private static readonly byte [] SeparatorBytes =
                        Encoding.ASCII.GetBytes (Separator);
            private static readonly byte [] SeparatorEndBytes =
                        Encoding.ASCII.GetBytes (SeparatorEnd);

            private HttpWebRequest request;
            private Stream output_stream;

            bool output_set;


            public MultipartRequest (HttpWebRequest http_request)
            {
                  request = http_request;
                  request.ContentType = "multipart/form-data; boundary="
                              + SeparatorString;
            }


            public HttpWebRequest Request {
                  get {
                        return request;
                  }
            }

            public Stream OutputStream {
                  get {
                        return output_stream;
                  }
                  set {
                        output_set = true;
                        output_stream = value;
                  }
            }


            public void BeginPart ()
            {
                  BeginPart (false);
            }

            public void BeginPart (bool first)
            {
                  if (!first) {
                        return;
                  }

                  LogBeginPart ();
                  InitContent ();
                  AppendContent (SeparatorBytes, 0,
                              SeparatorBytes.Length);
            }


            public void AddHeader (string name, string val)
            {
                  AddHeader (name, val, false);
            }

            public void AddHeader (string name, string val, bool last)
            {
                  AddHeader (String.Format ("{0}: {1}", name, val), last);
            }

            public void AddHeader (string header)
            {
                  AddHeader (header, false);
            }

            public void AddHeader (string header, bool last)
            {
                  bool need_crlf = !header.EndsWith ("\r\n");
                  byte [] bytes = Encoding.UTF8.GetBytes (header);
                  AppendContent (bytes, 0, bytes.Length);
                  if (need_crlf) {
                        AppendContent (CRLF, 0, CRLF.Length);
                  }
                  if (last) {
                        AppendContent (CRLF, 0, CRLF.Length);
                  }
            }


            public void WriteContent (string content)
            {
                  WriteContent (Encoding.UTF8.GetBytes (content));
            }

            public void WriteContent (byte [] content)
            {
                  AppendContent (content, 0, content.Length);
                  AppendContent (CRLF, 0, CRLF.Length);
            }

            public void WritePartialContent (byte [] content, int offset,
                                             int nbytes)
            {
                  AppendContent (content, offset, nbytes);
            }


            public void EndPartialContent ()
            {
                  AppendContent (CRLF, 0, CRLF.Length);
            }

            public void EndPart (bool last)
            {
                  if (last) {
                        LogEndPart ();
                        AppendContent (SeparatorEndBytes, 0,
                                    SeparatorEndBytes.Length);
                        CloseContent ();
                  } else {
                        AppendContent (SeparatorBytes, 0,
                                    SeparatorBytes.Length);
                  }
            }


            private void InitContent ()
            {
                  if (output_stream == null) {
                        output_stream = request.GetRequestStream ();
                  }
            }

            private void CloseContent ()
            {
                  if (!output_set) {
                        output_stream.Close ();
                  }
            }

            private void AppendContent (byte [] content, int offset,
                                        int length)
            {
                  LogContent (content, offset, length);
                  output_stream.Write (content, offset, length);
            }



            [Conditional (VerboseSymbol)]
            private static void LogBeginPart ()
            {
                  Debug.WriteLine (">>>START MultipartRequest content");
            }

            [Conditional (VerboseSymbol)]
            private static void LogEndPart ()
            {
                  Debug.WriteLine ("<<<END MultipartRequest content");
            }

            [Conditional (VerboseSymbol)]
            private static void LogContent (byte [] content, int offset,
                                            int length)
            {
                  char [] content_chars = new char [length];
                  Array.Copy (content, offset, content_chars, 0, length);
                  Debug.Write (new string (content_chars));
            }
      }
}

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