package org.apache.turbine.services.crypto;

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001-2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache Turbine" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
 *    written permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    "Apache Turbine", nor may "Apache" appear in their name, without
 *    prior written permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

import java.security.NoSuchAlgorithmException;

import java.util.Hashtable;
import java.util.Iterator;

import org.apache.commons.configuration.Configuration;

import org.apache.turbine.services.BaseService;
import org.apache.turbine.services.InitializationException;
import org.apache.turbine.services.TurbineServices;
import org.apache.turbine.services.crypto.provider.JavaCrypt;
import org.apache.turbine.services.factory.FactoryService;

/**
 * An implementation of CryptoService that uses either supplied crypto
 * Algorithms (provided in Turbine.Services.properties) or tries to get them via
 * the normal java mechanisms if this fails.
 *
 * @deprecated Use the Fulcrum Crypto component instead.
 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
 * @version $Id$
 *
 */

public class TurbineCryptoService
        extends BaseService
        implements CryptoService
{
    /** Key Prefix for our algorithms */
    private static final String ALGORITHM = "algorithm";

    /** Default Key */
    private static final String DEFAULT_KEY = "default";

    /** Default Encryption Class */
    private static final String DEFAULT_CLASS =
            JavaCrypt.class.getName();

    /** Names of the registered algorithms and the wanted classes */
    private Hashtable algos = null;

    /** A factory to construct CryptoAlgorithm objects  */
    private FactoryService factoryService = null;

    /**
     * There is not much to initialize here. This runs
     * as early init method.
     *
     * @throws InitializationException Something went wrong in the init
     *         stage
     */

    public void init()
            throws InitializationException
    {
        this.algos = new Hashtable();

        /*
         * Set up default (Can be overridden by default key
         * from the properties
         */

        algos.put(DEFAULT_KEY, DEFAULT_CLASS);

        /* get the parts of the configuration relevant to us. */

        Configuration conf = getConfiguration().subset(ALGORITHM);

        if (conf != null)
        {
            for (Iterator it = conf.getKeys(); it.hasNext();)
            {
                String key = (String) it.next();
                String val = conf.getString(key);
                // Log.debug("Registered " + val
                //            + " for Crypto Algorithm " + key);
                algos.put(key, val);
            }
        }

        try
        {
            factoryService = (FactoryService) TurbineServices.getInstance().
                    getService(FactoryService.SERVICE_NAME);
        }
        catch (Exception e)
        {
            throw new InitializationException(
                    "Failed to get a Factory object: ", e);
        }

        setInit(true);
    }

    /**
     * Returns a CryptoAlgorithm Object which represents the requested
     * crypto algorithm.
     *
     * @param algo      Name of the requested algorithm
     *
     * @return An Object representing the algorithm
     *
     * @throws NoSuchAlgorithmException  Requested algorithm is not available
     *
     */

    public CryptoAlgorithm getCryptoAlgorithm(String algo)
            throws NoSuchAlgorithmException
    {
        String cryptoClass = (String) algos.get(algo);
        CryptoAlgorithm ca = null;

        if (cryptoClass == null)
        {
            cryptoClass = (String) algos.get(DEFAULT_KEY);
        }

        if (cryptoClass == null || cryptoClass.equalsIgnoreCase("none"))
        {
            throw new NoSuchAlgorithmException(
                    "TurbineCryptoService: No Algorithm for "
                    + algo + " found");
        }

        try
        {
            ca = (CryptoAlgorithm) factoryService.getInstance(cryptoClass);
        }
        catch (Exception e)
        {
            throw new NoSuchAlgorithmException(
                    "TurbineCryptoService: Error instantiating "
                    + cryptoClass + " for " + algo);
        }

        ca.setCipher(algo);

        return ca;
    }
}