//
//  AbstractRemoteHandler
//  Copyright 2011 by Florian Richter
//  First released 2011 at http://yacy.net
//  
//  $LastChangedDate$
//  $LastChangedRevision$
//  $LastChangedBy$
//
//  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 2.1 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 program in the file lgpl21.txt
//  If not, see <http://www.gnu.org/licenses/>.
//

package net.yacy.http;

import java.io.IOException;
import java.util.LinkedList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.yacy.search.Switchboard;

import org.eclipse.jetty.server.Handler;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.handler.AbstractHandler;

/**
 * abstract jetty http handler
 * only request to remote hosts (proxy requests) are processed by derived classes 
 */
abstract public class AbstractRemoteHandler extends AbstractHandler implements Handler {
	
	protected Switchboard sb = null;
	
	private List<String> localVirtualHostNames;
	
	@Override
	protected void doStart() {
		sb = Switchboard.getSwitchboard();

		localVirtualHostNames = new LinkedList<String>();
		localVirtualHostNames.add("localpeer");
		localVirtualHostNames.add("localhost");
	}
	
	abstract public void handleRemote(String target, Request baseRequest, HttpServletRequest request,
			HttpServletResponse response) throws IOException, ServletException;
	
	@Override
	public void handle(String target, Request baseRequest, HttpServletRequest request,
			HttpServletResponse response) throws IOException, ServletException {
		String host = request.getHeader("Host");
		if(host == null) return; // no proxy request, continue processing by handlers
		int hostSplitPos = host.indexOf(':');
		String hostOnly =  hostSplitPos<0 ? host : host.substring(0, hostSplitPos);
		
		if(localVirtualHostNames.contains(hostOnly)) return; // no proxy request, continue processing by handlers
		
		handleRemote(target, baseRequest, request, response);
	}

}