de.pawlidi.openaletheia.license.LicenseLoader.java Source code

Introduction

Here is the source code for de.pawlidi.openaletheia.license.LicenseLoader.java

Source

/*
 * Copyright (C) 2016 Maximilian Pawlidi
 *
 * 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 de.pawlidi.openaletheia.license;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.Serializable;
import java.security.interfaces.RSAPublicKey;
import java.util.Properties;

import org.apache.commons.io.FileUtils;
import org.apache.commons.lang.StringUtils;

import de.pawlidi.openaletheia.LicenseException;
import de.pawlidi.openaletheia.base.model.License;
import de.pawlidi.openaletheia.utils.CipherUtils;
import de.pawlidi.openaletheia.utils.Converter;
import de.pawlidi.openaletheia.utils.PropertiesUtils;

/**
 * 
 * @author PAWLIDIM
 * 
 *         Create: 23:36:13 2015
 * 
 */
final class LicenseLoader implements Serializable {

    private String publicKey;

    /**
     * Constructor to construct new license loader.
     */
    public LicenseLoader(final String publicKey) {
        super();
        this.publicKey = publicKey;
    }

    public License loadLicense(final String fileName) throws LicenseException {
        Properties properties = load(fileName);
        License license = LicenseProperties.createLicense(properties);
        return license;
    }

    public Properties load(final String fileName) throws LicenseException {
        if (StringUtils.isBlank(fileName)) {
            throw new LicenseException("Invalid license file");
        }
        return load(new File(fileName));
    }

    public License loadLicense(File licenseFile) throws LicenseException {
        Properties properties = load(licenseFile);
        License license = LicenseProperties.createLicense(properties);
        return license;
    }

    public Properties load(File licenseFile) throws LicenseException {
        if (licenseFile == null) {
            throw new LicenseException("Invalid license file");
        }
        try {
            return load(FileUtils.openInputStream(licenseFile));
        } catch (IOException e) {
            throw new LicenseException("Could not load license file " + licenseFile.getName());
        }
    }

    public License loadLicense(InputStream licenseStream) throws LicenseException {
        Properties properties = load(licenseStream);
        License license = LicenseProperties.createLicense(properties);
        return license;
    }

    public Properties load(InputStream licenseStream) throws LicenseException {
        if (licenseStream == null) {
            throw new LicenseException("Given input stream cannot be null");
        }
        Properties properties = new Properties();
        try {
            properties.load(licenseStream);
        } catch (IOException e) {
            throw new LicenseException("Could not load license file");
        }
        return load(properties);
    }

    public Properties load(Properties properties) throws LicenseException {
        if (PropertiesUtils.isEmpty(properties)) {
            throw new LicenseException("Given properties cannot be empty or null");
        }

        if (StringUtils.isBlank(publicKey)) {
            throw new LicenseException("Given public key cannot be empty or null");
        }

        Object signature = PropertiesUtils.removeValue(properties, LicenseProperties.SIGNATURE);
        if (signature == null) {
            throw new LicenseException("Invalid license file");
        }

        final String encryptedSignature = (String) signature;

        if (StringUtils.isNotEmpty(encryptedSignature)) {

            // decrypt signature
            byte[] signatureData = Converter.toBytes(encryptedSignature);
            RSAPublicKey rsaPublicKey = CipherUtils.buildPublicKey(publicKey);
            byte[] decryptedSignatureData = CipherUtils.decrypt(signatureData, rsaPublicKey);
            String decryptedSignature = Converter.toString(decryptedSignatureData);

            // compute other signature
            byte[] otherSignatureData = CipherUtils.computeSignature(properties);
            String otherSignature = Converter.toString(otherSignatureData);

            // compare both
            if (!StringUtils.equals(otherSignature, decryptedSignature)) {
                throw new LicenseException("License signature violation");
            }
        } else {
            throw new LicenseException("Invalid license file");
        }
        return properties;
    }

    /**
     * Dispose reserved fields.
     */
    public void dispose() {
        publicKey = null;
    }
}