/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.openmeetings.app.sip.xmlrpc;

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

import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.TrustManager;
import javax.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];
    }

    /**
     * @throws CertificateException 
     * @see com.sun.net.ssl.X509TrustManager#isClientTrusted(X509Certificate[])
     */
    public void checkClientTrusted(X509Certificate[] certificates, String arg) throws CertificateException {
   		standardTrustManager.checkClientTrusted(certificates, arg);
    }

    /**
     * @throws CertificateException 
     * @see com.sun.net.ssl.X509TrustManager#isServerTrusted(X509Certificate[])
     */
    public void checkServerTrusted(X509Certificate[] certificates, String arg) throws CertificateException {
        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());
            }
        } else {
            standardTrustManager.checkServerTrusted(certificates, arg);
        }
    }

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