com.earldouglas.xjdl.io.LicenseLoader.java Source code

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Here is the source code for com.earldouglas.xjdl.io.LicenseLoader.java

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/*
 * Copyright 2010 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.earldouglas.xjdl.io;

import java.io.ByteArrayInputStream;
import java.io.ObjectInputStream;
import java.io.UnsupportedEncodingException;

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

import org.apache.commons.codec.binary.Base64;

import com.earldouglas.xjdl.License;
import com.earldouglas.xjdl.exception.LicenseException;
import com.earldouglas.xjdl.exception.LicenseInvalidException;

public abstract class LicenseLoader {

    private String key;

    public void setKey(String key) {
        this.key = key;
    }

    public License loadLicense() {
        try {
            return readLicense();
        } catch (Exception e) {
            LicenseException licenseException = new LicenseInvalidException();
            licenseException.setStackTrace(e.getStackTrace());
            throw (licenseException);
        }
    }

    protected abstract License readLicense() throws Exception;

    protected License decryptLicense(String encodedLicense)
            throws BadPaddingException, UnsupportedEncodingException, Exception {
        byte[] encryptedLicense = Base64.decodeBase64(encodedLicense);

        SecretKeySpec secretKeySpec = new SecretKeySpec(key.getBytes(), "AES");
        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);
        byte[] serializedLicense = cipher.doFinal(encryptedLicense);

        ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(serializedLicense);
        ObjectInputStream objectInputStream = new ObjectInputStream(byteArrayInputStream);
        License license = (License) objectInputStream.readObject();
        objectInputStream.close();
        return license;
    }
}