/*
* Created on 15-Dec-2004
* Created by Paul Gardner
* Copyright (C) 2004, 2005, 2006 Aelitis, All Rights Reserved.
*
* 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, or (at your option) any later version.
* 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.
* 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.
*
* AELITIS, SAS au capital de 46,603.30 euros
* 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
*
*/
package com.aelitis.azureus.core.proxy.impl;
import java.util.*;
import java.net.InetAddress;
import java.net.MalformedURLException;
import java.net.URL;
import org.gudy.azureus2.core3.config.COConfigurationManager;
import org.gudy.azureus2.core3.util.AEMonitor;
import org.gudy.azureus2.core3.util.ByteFormatter;
import org.gudy.azureus2.core3.util.Debug;
import org.gudy.azureus2.core3.util.RandomUtils;
import com.aelitis.azureus.core.proxy.AEProxyAddressMapper;
/**
* @author parg
*
*/
public class
AEProxyAddressMapperImpl
implements AEProxyAddressMapper
{
protected static AEProxyAddressMapper singleton = new AEProxyAddressMapperImpl();
public static AEProxyAddressMapper
getSingleton()
{
return( singleton );
}
protected boolean enabled;
protected String prefix;
protected long next_value;
protected Map<String,String> map = new HashMap<String,String>();
protected Map<String,String> reverse_map = new HashMap<String,String>();
protected AEMonitor this_mon = new AEMonitor( "AEProxyAddressMapper" );
protected
AEProxyAddressMapperImpl()
{
if ( COConfigurationManager.getBooleanParameter("Enable.Proxy") &&
COConfigurationManager.getBooleanParameter("Enable.SOCKS")){
String host = COConfigurationManager.getStringParameter("Proxy.Host");
try{
if ( host.length() > 0 &&
InetAddress.getByName(host).isLoopbackAddress()){
enabled = true;
byte[] b = new byte[120];
for (int i=0;i<b.length;i++){
b[i] = (byte)(RandomUtils.nextInt(256));
}
prefix = ByteFormatter.encodeString( b );
}
}catch( Throwable e ){
Debug.printStackTrace(e);
}
}
}
public String
internalise(
String address )
{
if ( !enabled ){
return( address );
}
if ( address.length() < 256 ){
return( address );
}
String target;
try{
this_mon.enter();
target = reverse_map.get( address );
if ( target == null ){
StringBuilder target_b = new StringBuilder( 256 );
target_b.append( prefix );
target_b.append( next_value++ );
while( target_b.length() < 255 ){
target_b.append( "0" );
}
target = target_b.toString();
map.put( target, address );
reverse_map.put( address, target );
}
}finally{
this_mon.exit();
}
// System.out.println( "AEProxyAddressMapper: internalise " + address + " -> " + target );
return( target );
}
public String
externalise(
String address )
{
if ( !enabled || address.length() < 255 ){
return( address );
}
String target = map.get( address );
if ( target == null ){
target = address;
}
// System.out.println( "AEProxyAddressMapper: externalise " + address + " -> " + target );
return( target );
}
public URL
internalise(
URL url )
{
if ( !enabled ){
return( url );
}
String host = url.getHost();
if ( host.length() < 256 ){
return( url );
}
String new_host = internalise( host );
String url_str = url.toString();
int pos = url_str.indexOf( host );
if ( pos == -1 ){
Debug.out( "inconsistent url '" + url_str + "' / '" + host + "'" );
return( url );
}
String new_url_str = url_str.substring(0,pos) +
new_host + url_str.substring(pos+host.length());
try{
return( new URL( new_url_str ));
}catch( MalformedURLException e ){
Debug.printStackTrace(e);
return( url );
}
}
public URL
externalise(
URL url )
{
if ( !enabled ){
return( url );
}
String host = url.getHost();
if ( host.length() < 255 ){
return( url );
}
String new_host = externalise( host );
String url_str = url.toString();
int pos = url_str.indexOf( host );
if ( pos == -1 ){
Debug.out( "inconsistent url '" + url_str + "' / '" + host + "'" );
return( url );
}
String new_url_str = url_str.substring(0,pos) +
new_host + url_str.substring(pos+host.length());
try{
return( new URL( new_url_str ));
}catch( MalformedURLException e ){
Debug.printStackTrace(e);
return( url );
}
}
}