/*******************************************************************************
 * Copyright (c) 2007, 2008 IBM Corporation and Others
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Hisashi MIYASHITA - initial API and implementation
 *******************************************************************************/

package org.eclipse.actf.model.internal.flash.proxy;

import java.security.SecureRandom;

import org.eclipse.actf.util.httpproxy.proxy.ISecretManager;
import org.eclipse.actf.util.httpproxy.util.CacheMap;

public class SWFSecretManager implements ISecretManager {
	private CacheMap secrets = new CacheMap(256, 20);
	private SecureRandom random;
	private static final int SECRET_LENGTH = 20;

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.actf.util.httpproxy.proxy.ISecretManager#getSecret(java.lang
	 * .String, boolean)
	 */
	public synchronized String getSecret(String id, boolean remove) {
		String secret = (String) secrets.get(id);
		if (remove && (secret != null)) {
			secrets.remove(id);
		}
		return secret;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.actf.util.httpproxy.proxy.ISecretManager#requestSecret()
	 */
	public byte[] requestSecret() {
		byte[] secretBytes = new byte[SECRET_LENGTH * 2];
		random.nextBytes(secretBytes);
		StringBuffer buf = new StringBuffer("contentid="); //$NON-NLS-1$
		StringBuffer buf2 = new StringBuffer();
		int i;
		for (i = 0; i < SECRET_LENGTH; i++) {
			byte b = secretBytes[i];
			buf2.append(b % 100);
		}
		String id = buf2.toString();
		buf.append(buf2);
		buf2.setLength(0);
		buf.append("&secret="); //$NON-NLS-1$
		for (; i < SECRET_LENGTH * 2; i++) {
			byte b = secretBytes[i];
			buf2.append(b % 100);
		}
		buf.append(buf2);
		buf.append("&end=term"); //$NON-NLS-1$
		buf.append('\r');
		buf.append('\n');
		String secret = buf2.toString();
		synchronized (this) {
			secrets.put(id, secret);
		}
		return buf.toString().getBytes();
	}

	public SWFSecretManager() {
		this.random = new SecureRandom();
	}
}