Handler.java example

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/*
 * File    : Handler.java
 * Created : 19-Jan-2004
 * By      : parg
 * 
 * Azureus - a Java Bittorrent client
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License.
 *
 * This program 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 General Public License for more details ( see the LICENSE file ).
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package org.gudy.azureus2.core3.util.protocol.maggot;

/**
 * @author parg
 *
 */

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.*;

import org.gudy.azureus2.core3.util.Base32;
import org.gudy.azureus2.core3.util.ByteFormatter;
import org.gudy.azureus2.core3.util.protocol.magnet.MagnetConnection2;

import com.aelitis.net.magneturi.MagnetURIHandler;


public class 
Handler 
	extends URLStreamHandler 
{
	public URLConnection 
	openConnection(URL u)
	{		
		return(
			new MagnetConnection2( 
				u,
				new MagnetConnection2.MagnetHandler()
				{
					
					public void 
					process(
						URL 			maggot, 
						OutputStream	os) 
						
						throws IOException
					{
							// convert into magnet lookalike
						
						String maggot_str = maggot.toExternalForm();
						
						int pos = maggot_str.indexOf( '?' );
							
						String rem;
						
						if ( pos == -1 ){
							
							rem = "";
							
						}else{
							
							rem = "&" + maggot_str.substring( pos+1 );
							
							maggot_str = maggot_str.substring( 0, pos );
						}
						
						pos = maggot_str.lastIndexOf( "/" );
						
						maggot_str = maggot_str.substring( pos+1 );
						
						String[] bits = maggot_str.split( ":" );
						
						String btih_str = bits[0];
						String sha1_str	= bits[1];
					
						String	magnet_str = "magnet:?xt=urn:btih:" + Base32.encode( ByteFormatter.decodeString( btih_str ));
						
						magnet_str += rem + "&maggot_sha1=" + sha1_str;
						
						URL magnet = new URL( magnet_str );
						
						String	get = "/download/" + magnet.toString().substring( 7 ) + " HTTP/1.0\r\n\r\n";
						
						MagnetURIHandler.getSingleton().process( get, new ByteArrayInputStream(new byte[0]), os );
					}
				}));
	}
	
	 protected void 
	 parseURL(
		URL 		u, 
		String 		spec, 
		int 		start, 
		int 		limit ) 
	 {
		 	// need to override this as the <ih>:<sha1> format of maggot URIs isn't compatible with the 
		 	// usual <host>:<port>.... - turn it all into the host
		 
		 spec = spec.substring( start );
		 
		 while( spec.length() > 0 && "/?".indexOf( spec.charAt(0)) != -1 ){
			 
			 spec = spec.substring(1);
		 }
		 
		 setURL(u, "maggot", spec, -1, spec, null, "", null, null );
	 }
}