/***
 * 
 * Copyright (C) 2008 Alessandro La Rosa
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Contact: alessandro.larosa@gmail.com
 *
 * Author: Alessandro La Rosa
 */

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.Hashtable;

import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;

public class HttpMultipartRequest
{
	static final String BOUNDARY = "----------V2ymHFg03ehbqgZCaKO6jy";
	
	byte[] postBytes = null;
	String url = null;
	
	public HttpMultipartRequest(String url, Hashtable params, String fileField, String fileName, String fileType, byte[] fileBytes) throws Exception
	{
		this.url = url;
		
		String boundary = getBoundaryString();
		
		String boundaryMessage = getBoundaryMessage(boundary, params, fileField, fileName, fileType);
		
		String endBoundary = "\r\n--" + boundary + "--\r\n";
		
		ByteArrayOutputStream bos = new ByteArrayOutputStream();
		
		bos.write(boundaryMessage.getBytes());
		
		bos.write(fileBytes);
		
		bos.write(endBoundary.getBytes());
		
		this.postBytes = bos.toByteArray();
		
		bos.close();
	}
	
	String getBoundaryString()
	{
		return BOUNDARY;
	}
	
	String getBoundaryMessage(String boundary, Hashtable params, String fileField, String fileName, String fileType)
	{
		StringBuffer res = new StringBuffer("--").append(boundary).append("\r\n");
		
		Enumeration keys = params.keys();
		
		while(keys.hasMoreElements())
		{
			String key = (String)keys.nextElement();
			String value = (String)params.get(key);
			
			res.append("Content-Disposition: form-data; name=\"").append(key).append("\"\r\n")    
				.append("\r\n").append(value).append("\r\n")
				.append("--").append(boundary).append("\r\n");
		}
		res.append("Content-Disposition: form-data; name=\"").append(fileField).append("\"; filename=\"").append(fileName).append("\"\r\n") 
			.append("Content-Type: ").append(fileType).append("\r\n\r\n");
		
		return res.toString();
	}
	
	public byte[] send() throws Exception
	{
		HttpConnection hc = null;
		
		InputStream is = null;
		
		ByteArrayOutputStream bos = new ByteArrayOutputStream();
		
		byte[] res = null;

		try
		{
			hc = (HttpConnection) Connector.open(url);
			
			hc.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + getBoundaryString());
			
			hc.setRequestMethod(HttpConnection.POST);
			
			OutputStream dout = hc.openOutputStream();
			
			dout.write(postBytes);
			
			dout.close();
	
			int ch;
	
			is = hc.openInputStream();
			
			while ((ch = is.read()) != -1)
			{
				bos.write(ch);
			}
			res = bos.toByteArray();
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		finally
		{
			try
			{
				if(bos != null)
					bos.close();
				
				if(is != null)
					is.close();
				
				if(hc != null)
					hc.close();
			}
			catch(Exception e2)
			{
				e2.printStackTrace();
			}
		}
		return res;
	}
}