org.kawanfw.file.servlet.convert.StreamsEncrypted.java Source code

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Here is the source code for org.kawanfw.file.servlet.convert.StreamsEncrypted.java

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/*
 * This file is part of Awake FILE. 
 * Awake file: Easy file upload & download over HTTP with Java.                                    
 * Copyright (C) 2015,  KawanSoft SAS
 * (http://www.kawansoft.com). All rights reserved.                                
 *                                                                               
 * Awake FILE 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.            
 *                                                                               
 * Awake FILE 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.                               
 *                                                                               
 * You should have received a copy of the GNU Lesser General Public              
 * License along with this library; if not, write to the Free Software           
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  
 * 02110-1301  USA
 *
 * Any modifications to this file must keep this entire header
 * intact.
 */
package org.kawanfw.file.servlet.convert;

import java.io.IOException;
import java.io.InputStream;
import java.sql.SQLException;

import org.apache.commons.fileupload.util.Streams;
import org.apache.commons.lang3.StringUtils;
import org.kawanfw.commons.api.server.CommonsConfigurator;
import org.kawanfw.commons.util.Tag;
import org.kawanfw.commons.util.convert.Pbe;
import org.kawanfw.file.servlet.CommonsConfiguratorCall;

/**
 * 
 * Wrapper/holder for org.apache.commons.fileupload.util.Streams that will allow
 * to decrypt correctly the request.getParameter()
 * 
 * @author Nicolas de Pomereu
 * 
 */

public class StreamsEncrypted {

    /**
     * Protected constructor
     */
    protected StreamsEncrypted() {

    }

    /**
     * @param stream
     *            The ServletFileUpload input stream
     * @param commonsConfigurator
     *            Used to get the password for encryption
     */
    public static String asString(InputStream stream, CommonsConfigurator commonsConfigurator) throws IOException {
        String value = Streams.asString(stream);

        if (isEncrypted(value, commonsConfigurator)) {
            try {
                value = StringUtils.substringAfter(value, Pbe.KAWANFW_ENCRYPTED);

                value = new Pbe().decryptFromHexa(value,
                        CommonsConfiguratorCall.getEncryptionPassword(commonsConfigurator));

                return value;
            } catch (Exception e) {
                String message = Tag.PRODUCT_USER_CONFIG_FAIL + " Impossible to decrypt the value " + value;
                message += ". Check that password values are the same on client and server side.";

                throw new IOException(message, e);
            }
        } else {
            return value;
        }
    }

    /**
     * Says it the request is encrypted
     * 
     * @param parameterName
     *            the parameter name
     * @return if the request is encrypted
     */
    private static boolean isEncrypted(String value, CommonsConfigurator commonsConfigurator) throws IOException {

        char[] password = null;

        try {
            password = CommonsConfiguratorCall.getEncryptionPassword(commonsConfigurator);
        } catch (SQLException e) {
            throw new IOException(e);
        }

        if (commonsConfigurator != null && password != null) {
            if (value != null && !value.isEmpty() && value.startsWith(Pbe.KAWANFW_ENCRYPTED)) {
                return true;
            } else {
                return false;
            }
        } else {
            return false;
        }

    }

}