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using System;
using System.Collections.Generic;
using System.Net;
using System.IO;
using System.Text;
namespace OpenSim.Framework
{
public static class MultipartForm
{
#region Helper Classes
public abstract class Element
{
public string Name;
}
public class File : Element
{
public string Filename;
public string ContentType;
public byte[] Data;
public File(string name, string filename, string contentType, byte[] data)
{
Name = name;
Filename = filename;
ContentType = contentType;
Data = data;
}
}
public class Parameter : Element
{
public string Value;
public Parameter(string name, string value)
{
Name = name;
Value = value;
}
}
#endregion Helper Classes
public static HttpWebResponse Post(HttpWebRequest request, List<Element> postParameters)
{
string boundary = Boundary();
// Set up the request properties
request.Method = "POST";
request.ContentType = "multipart/form-data; boundary=" + boundary;
#region Stream Writing
using (MemoryStream formDataStream = new MemoryStream())
{
foreach (var param in postParameters)
{
if (param is File)
{
File file = (File)param;
// Add just the first part of this param, since we will write the file data directly to the Stream
string header = string.Format("--{0}\r\nContent-Disposition: form-data; name=\"{1}\"; filename=\"{2}\";\r\nContent-Type: {3}\r\n\r\n",
boundary,
file.Name,
!String.IsNullOrEmpty(file.Filename) ? file.Filename : "tempfile",
file.ContentType);
formDataStream.Write(Encoding.UTF8.GetBytes(header), 0, header.Length);
formDataStream.Write(file.Data, 0, file.Data.Length);
}
else
{
Parameter parameter = (Parameter)param;
string postData = string.Format("--{0}\r\nContent-Disposition: form-data; name=\"{1}\"\r\n\r\n{2}\r\n",
boundary,
parameter.Name,
parameter.Value);
formDataStream.Write(Encoding.UTF8.GetBytes(postData), 0, postData.Length);
}
}
// Add the end of the request
byte[] footer = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n");
formDataStream.Write(footer, 0, footer.Length);
request.ContentLength = formDataStream.Length;
// Copy the temporary stream to the network stream
formDataStream.Seek(0, SeekOrigin.Begin);
using (Stream requestStream = request.GetRequestStream())
formDataStream.CopyTo(requestStream, (int)formDataStream.Length);
}
#endregion Stream Writing
return request.GetResponse() as HttpWebResponse;
}
private static string Boundary()
{
Random rnd = new Random();
string formDataBoundary = String.Empty;
while (formDataBoundary.Length < 15)
formDataBoundary = formDataBoundary + rnd.Next();
formDataBoundary = formDataBoundary.Substring(0, 15);
formDataBoundary = "-----------------------------" + formDataBoundary;
return formDataBoundary;
}
}
}
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