com.liferay.sync.engine.lan.util.LanTokenUtil.java Source code

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Here is the source code for com.liferay.sync.engine.lan.util.LanTokenUtil.java

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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * 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.
 */

package com.liferay.sync.engine.lan.util;

import java.nio.charset.Charset;

import java.security.SecureRandom;

import java.util.Arrays;
import java.util.Collections;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.collections4.map.PassiveExpiringMap;
import org.apache.commons.lang.RandomStringUtils;

/**
 * @author Dennis Ju
 */
public class LanTokenUtil {

    public static boolean containsLanToken(String lanToken) {
        return _lanTokens.contains(lanToken);
    }

    public static String createEncryptedToken(String lanTokenKey) throws Exception {

        String lanToken = RandomStringUtils.random(32, 0, 0, true, true, null, _secureRandom);

        byte[] bytes = DigestUtils.sha1(lanTokenKey);

        bytes = Arrays.copyOf(bytes, 16);

        Cipher cipher = Cipher.getInstance("AES");

        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(bytes, "AES"));

        String encryptedToken = Base64
                .encodeBase64String(cipher.doFinal(lanToken.getBytes(Charset.forName("UTF-8"))));

        _lanTokens.add(lanToken);

        return encryptedToken;
    }

    public static String decryptLanToken(String lanTokenKey, String encryptedToken) throws Exception {

        byte[] bytes = DigestUtils.sha1(lanTokenKey);

        bytes = Arrays.copyOf(bytes, 16);

        Cipher cipher = Cipher.getInstance("AES");

        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(bytes, "AES"));

        return new String(cipher.doFinal(Base64.decodeBase64(encryptedToken)), Charset.forName("UTF-8"));
    }

    public static boolean removeLanToken(String lanToken) {
        return _lanTokens.remove(lanToken);
    }

    private static final Set<String> _lanTokens = Collections
            .newSetFromMap(new PassiveExpiringMap(3600, TimeUnit.SECONDS, new ConcurrentHashMap()));
    private static final SecureRandom _secureRandom = new SecureRandom();

}