/*
 * ====================================================================
 *
 *  Copyright 2002-2004 The Apache Software Foundation
 *
 *  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.
 * ====================================================================
 *
 * 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/>.
 *
 */

package org.apache.commons.httpclient.contrib.ssl;

import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

import com.sun.net.ssl.TrustManagerFactory;
import com.sun.net.ssl.TrustManager;
import com.sun.net.ssl.X509TrustManager;
import org.apache.commons.logging.Log; 
import org.apache.commons.logging.LogFactory;

/**
 * <p>
 * EasyX509TrustManager unlike default {@link X509TrustManager} accepts 
 * self-signed certificates. 
 * </p>
 * <p>
 * This trust manager SHOULD NOT be used for productive systems 
 * due to security reasons, unless it is a concious decision and 
 * you are perfectly aware of security implications of accepting 
 * self-signed certificates
 * </p>
 * 
 * @author <a href="mailto:adrian.sutton@ephox.com">Adrian Sutton</a>
 * @author <a href="mailto:oleg@ural.ru">Oleg Kalnichevski</a>
 * 
 * <p>
 * DISCLAIMER: HttpClient developers DO NOT actively support this component.
 * The component is provided as a reference material, which may be inappropriate
 * for use without additional customization.
 * </p>
 */

public class EasyX509TrustManager implements X509TrustManager
{
    private X509TrustManager standardTrustManager = null;

    /** Log object for this class. */
    private static final Log LOG = LogFactory.getLog(EasyX509TrustManager.class);

    /**
     * Constructor for EasyX509TrustManager.
     */
    public EasyX509TrustManager(KeyStore keystore) throws NoSuchAlgorithmException, KeyStoreException {
        super();
        TrustManagerFactory factory = TrustManagerFactory.getInstance("SunX509");
        factory.init(keystore);
        TrustManager[] trustmanagers = factory.getTrustManagers();
        if (trustmanagers.length == 0) {
            throw new NoSuchAlgorithmException("SunX509 trust manager not supported");
        }
        this.standardTrustManager = (X509TrustManager)trustmanagers[0];
    }

    /**
     * @see com.sun.net.ssl.X509TrustManager#isClientTrusted(X509Certificate[])
     */
    public boolean isClientTrusted(X509Certificate[] certificates) {
        return this.standardTrustManager.isClientTrusted(certificates);
    }

    /**
     * @see com.sun.net.ssl.X509TrustManager#isServerTrusted(X509Certificate[])
     */
    public boolean isServerTrusted(X509Certificate[] certificates) {
        if ((certificates != null) && LOG.isDebugEnabled()) {
            LOG.debug("Server certificate chain:");
            for (int i = 0; i < certificates.length; i++) {
                LOG.debug("X509Certificate[" + i + "]=" + certificates[i]);
            }
        }
        if ((certificates != null) && (certificates.length == 1)) {
            X509Certificate certificate = certificates[0];
            try {
                certificate.checkValidity(); 
            }
            catch (CertificateException e) {
                LOG.error(e.toString());
                return false;
            }
            return true;
        } else {
            return this.standardTrustManager.isServerTrusted(certificates);
        }
    }

    /**
     * @see com.sun.net.ssl.X509TrustManager#getAcceptedIssuers()
     */
    public X509Certificate[] getAcceptedIssuers() {
        return this.standardTrustManager.getAcceptedIssuers();
    }
}