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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2012 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
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 */

package org.glassfish.loadbalancer.admin.cli.connection;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.HostnameVerifier;
import java.net.HttpURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import com.sun.enterprise.security.ssl.SSLUtils;

import org.glassfish.hk2.api.ServiceLocator;
import org.glassfish.internal.api.Globals;
import org.glassfish.loadbalancer.admin.cli.LbLogUtil;

/**
 *
 * @author hr124446
 */
public class ConnectionManager {

    public static final String HTTPS_PROTOCOL = "https";
    public static final String HTTP_PROTOCOL = "http";
    public static final String TLS = "TLS";

    /** Creates a new instance of ConnectionManager */
    public ConnectionManager(String lbHost, String lbPort, String lbProxyHost,
            String lbProxyPort, String lbName, boolean isSecure) {
        _lbHost = lbHost;
        _lbPort = lbPort;
        _lbProxyHost = lbProxyHost;
        _lbProxyPort = lbProxyPort;
        _lbName = lbName;
        _isSecure = isSecure;
    }

    /**
     * creates a connection to the loadbalancer
     * @param contextRoot context root that will be used in constructing the URL
     * @throws java.io.IOException 
     * @return either HTTP or HTTPS connection to the load balancer.
     */
    public HttpURLConnection getConnection(String contextRoot) throws IOException {
        if (_isSecure) {
            return getSecureConnection(contextRoot);
        } else {
            return getNonSecureConnection(contextRoot);
        }
    }

    /**
     * creates a connection to the loadbalancer
     * @param contextRoot context root that will be used in constructing the URL
     * @throws java.io.IOException 
     * @return either HTTP or HTTPS connection to the load balancer.
     */
    private HttpURLConnection getNonSecureConnection(String contextRoot) throws IOException {
        if (_lbHost == null || _lbPort == null) {
            String msg = LbLogUtil.getStringManager().getString("LbDeviceNotConfigured", _lbName);
            throw new IOException(msg);
        }

        HttpURLConnection conn = null;
        URL url = null;
        try {

            //---------------------------------
            url = new URL(HTTP_PROTOCOL, _lbHost, Integer.parseInt(_lbPort), contextRoot);
            if (_lbProxyHost != null && _lbProxyPort != null) {
                Proxy proxy = new Proxy(Proxy.Type.HTTP,
                        new InetSocketAddress(_lbProxyHost, Integer.parseInt(_lbProxyPort)));
                conn = (HttpURLConnection) url.openConnection(proxy);
            } else {
                conn = (HttpURLConnection) url.openConnection();
            }
        } catch (Exception e) {
            throw new IOException(e.getMessage(), e);
        }
        return conn;
    }

    /**
     * creates a connection to the loadbalancer
     * @param contextRoot context root that will be used in constructing the URL
     * @throws java.io.IOException 
     * @return HTTPS connection to the load balancer.
     */
    private HttpsURLConnection getSecureConnection(String contextRoot) throws IOException {
        if (_lbHost == null || _lbPort == null) {
            String msg = LbLogUtil.getStringManager().getString("LbDeviceNotConfigured", _lbName);
            throw new IOException(msg);
        }

        HttpsURLConnection conn = null;
        URL url = null;
        try {
            //---------------------------------
            // Create a trust manager that does not validate certificate chains
            TrustManager[] trustAllCerts = new TrustManager[]{
                new X509TrustManager() {

                    @Override
                    public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                        return null;
                    }

                    @Override
                    public void checkClientTrusted(
                            java.security.cert.X509Certificate[] certs, String authType) {
                    }

                    @Override
                    public void checkServerTrusted(
                            java.security.cert.X509Certificate[] certs, String authType) {
                    }
                }
            };

            // Install the all-trusting trust manager
            SSLContext sc = SSLContext.getInstance(TLS);
            ServiceLocator habitat = Globals.getDefaultHabitat();
            SSLUtils sslUtils = habitat.getService(SSLUtils.class);
            sc.init(sslUtils.getKeyManagers(), trustAllCerts, new java.security.SecureRandom());

            //---------------------------------
            url = new URL(HTTPS_PROTOCOL, _lbHost, Integer.parseInt(_lbPort), contextRoot);
            if (_lbProxyHost != null && _lbProxyPort != null) {
                Proxy proxy = new Proxy(Proxy.Type.HTTP,
                        new InetSocketAddress(_lbProxyHost, Integer.parseInt(_lbProxyPort)));
                conn = (HttpsURLConnection) url.openConnection(proxy);
            } else {
                conn = (HttpsURLConnection) url.openConnection();
            }
            conn.setSSLSocketFactory(sc.getSocketFactory());
            HostnameVerifier hnv = new SSLHostNameVerifier();
            conn.setDefaultHostnameVerifier(hnv);
        } catch (Exception e) {
            throw new IOException(e.getMessage(), e);
        }
        return conn;
    }
    private String _lbHost = null;
    private String _lbPort = null;
    private String _lbProxyHost = null;
    private String _lbProxyPort = null;
    private String _lbName = null;
    private boolean _isSecure = true;
}