/*
 * 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.apache.kylin.engine.mr.common;

import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;

import org.apache.commons.httpclient.ConnectTimeoutException;
import org.apache.commons.httpclient.HttpClientError;
import org.apache.commons.httpclient.params.HttpConnectionParams;
import org.apache.commons.httpclient.protocol.ControllerThreadSocketFactory;
import org.apache.commons.httpclient.protocol.SecureProtocolSocketFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author xduo
 * 
 */
public class DefaultSslProtocolSocketFactory implements SecureProtocolSocketFactory {
    /** Log object for this class. */
    private static Logger logger = LoggerFactory.getLogger(DefaultSslProtocolSocketFactory.class);
    private SSLContext sslcontext = null;

    /**
     * Constructor for DefaultSslProtocolSocketFactory.
     */
    public DefaultSslProtocolSocketFactory() {
        super();
    }

    /**
     * @see SecureProtocolSocketFactory#createSocket(java.lang.String,int,java.net.InetAddress,int)
     */
    public Socket createSocket(String host, int port, InetAddress clientHost, int clientPort) throws IOException, UnknownHostException {
        return getSSLContext().getSocketFactory().createSocket(host, port, clientHost, clientPort);
    }

    /**
     * Attempts to get a new socket connection to the given host within the
     * given time limit.
     * 
     * <p>
     * To circumvent the limitations of older JREs that do not support connect
     * timeout a controller thread is executed. The controller thread attempts
     * to create a new socket within the given limit of time. If socket
     * constructor does not return until the timeout expires, the controller
     * terminates and throws an {@link ConnectTimeoutException}
     * </p>
     * 
     * @param host
     *            the host name/IP
     * @param port
     *            the port on the host
     * @param localAddress
     *            the local host name/IP to bind the socket to
     * @param localPort
     *            the port on the local machine
     * @param params
     *            {@link HttpConnectionParams Http connection parameters}
     * 
     * @return Socket a new socket
     * 
     * @throws IOException
     *             if an I/O error occurs while creating the socket
     * @throws UnknownHostException
     *             if the IP address of the host cannot be determined
     * @throws ConnectTimeoutException
     *             DOCUMENT ME!
     * @throws IllegalArgumentException
     *             DOCUMENT ME!
     */
    public Socket createSocket(final String host, final int port, final InetAddress localAddress, final int localPort, final HttpConnectionParams params) throws IOException, UnknownHostException, ConnectTimeoutException {
        if (params == null) {
            throw new IllegalArgumentException("Parameters may not be null");
        }

        int timeout = params.getConnectionTimeout();

        if (timeout == 0) {
            return createSocket(host, port, localAddress, localPort);
        } else {
            // To be eventually deprecated when migrated to Java 1.4 or above
            return ControllerThreadSocketFactory.createSocket(this, host, port, localAddress, localPort, timeout);
        }
    }

    /**
     * @see SecureProtocolSocketFactory#createSocket(java.lang.String,int)
     */
    public Socket createSocket(String host, int port) throws IOException, UnknownHostException {
        return getSSLContext().getSocketFactory().createSocket(host, port);
    }

    /**
     * @see SecureProtocolSocketFactory#createSocket(java.net.Socket,java.lang.String,int,boolean)
     */
    public Socket createSocket(Socket socket, String host, int port, boolean autoClose) throws IOException, UnknownHostException {
        return getSSLContext().getSocketFactory().createSocket(socket, host, port, autoClose);
    }

    public boolean equals(Object obj) {
        return ((obj != null) && obj.getClass().equals(DefaultX509TrustManager.class));
    }

    public int hashCode() {
        return DefaultX509TrustManager.class.hashCode();
    }

    private static SSLContext createEasySSLContext() {
        try {
            SSLContext context = SSLContext.getInstance("TLS");
            context.init(null, new TrustManager[] { new DefaultX509TrustManager(null) }, null);

            return context;
        } catch (Exception e) {
            logger.error(e.getMessage(), e);
            throw new HttpClientError(e.toString());
        }
    }

    private SSLContext getSSLContext() {
        if (this.sslcontext == null) {
            this.sslcontext = createEasySSLContext();
        }

        return this.sslcontext;
    }
}
