package com.atlassian.theplugin.commons.thirdparty.apache;

/*
 * $HeadURL$
 * $Revision$
 * $Date$
 *
 * ====================================================================
 *
 *  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.
 * ====================================================================
 *
 * 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 org.apache.commons.httpclient.ConnectTimeoutException;
import org.apache.commons.httpclient.HttpClientError;
import org.apache.commons.httpclient.params.HttpConnectionParams;
import org.apache.commons.httpclient.protocol.SecureProtocolSocketFactory;

import javax.net.SocketFactory;
import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.UnknownHostException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateException;

import static java.lang.System.getProperty;

/**
 * <p>
 * EasySSLProtocolSocketFactory can be used to creats SSL {@link Socket}s
 * that accept self-signed certificates.
 * </p>
 * <p>
 * This socket factory 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>
 * <p/>
 * <p>
 * Example of using custom protocol socket factory for a specific host:
 * <pre>
 *     Protocol easyhttps = new Protocol("https", new EasySSLProtocolSocketFactory(), 443);
 * <p/>
 *     HttpClient client = new HttpClient();
 *     client.getHostConfiguration().setHost("localhost", 443, easyhttps);
 *     // use relative url only
 *     GetMethod httpget = new GetMethod("/");
 *     client.executeMethod(httpget);
 *     </pre>
 * </p>
 * <p>
 * Example of using custom protocol socket factory per default instead of the standard one:
 * <pre>
 *     Protocol easyhttps = new Protocol("https", new EasySSLProtocolSocketFactory(), 443);
 *     Protocol.registerProtocol("https", easyhttps);
 * <p/>
 *     HttpClient client = new HttpClient();
 *     GetMethod httpget = new GetMethod("https://localhost/");
 *     client.executeMethod(httpget);
 *     </pre>
 * </p>
 *
 * @author <a href="mailto:oleg -at- ural.ru">Oleg Kalnichevski</a>
 *         <p/>
 *         <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 EasySSLProtocolSocketFactory implements SecureProtocolSocketFactory {
    public final static int SSL_PORT = 443;
    private SSLContext sslcontext = null;
    //private Logger logger;

    /**
     * Constructor for EasySSLProtocolSocketFactory.
     */
    public EasySSLProtocolSocketFactory() {
        super();
        //this.logger = logger;
    }

    private SSLContext createEasySSLContext() {

        KeyManagerFactory kmf = null;

        try {
            final KeyStore keyStore = getKeyStore();
            final String p = getProperty("javax.net.ssl.keyStorePassword");
            if (keyStore != null && p != null) {
                kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
                kmf.init(keyStore, p.toCharArray() );
                TrustManagerFactory tmf =
                        TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
                tmf.init(keyStore);
            }
            //the exception is not important
        } catch (KeyStoreException e) {
        } catch (NoSuchAlgorithmException e) {
        } catch (UnrecoverableKeyException e) {
        }


        try {
            SSLContext context = SSLContext.getInstance("SSL");

            context.init(
                    kmf != null ? kmf.getKeyManagers() : null,
                    new TrustManager[]{getTrustManager()},
                    kmf != null ? new SecureRandom() : null);
            return context;
        } catch (Exception e) {
            //logger.error(e.getMessage(), e);
            throw new HttpClientError(e.toString());
        }
    }

    public static KeyStore getKeyStore() {
        KeyStore keyJKSStore = getKeyJKSStore(getProperty("javax.net.ssl.keyStore"), getProperty("javax.net.ssl.keyStorePassword"));
        KeyStore trust = getKeyJKSStore(getProperty("javax.net.ssl.trustStore"), getProperty("javax.net.ssl.trustStorePassword"));

//        if (keyJKSStore == null) {
//            try {
//                keyJKSStore = KeyStore.getInstance("JKS");
//
//            } catch (KeyStoreException e) {
//                return null;
//            }
//        }

        try {
            if (trust != null && keyJKSStore != null && trust.size() > 0 && keyJKSStore.size() > 0) {
                try {
                    while (trust.aliases().hasMoreElements()) {
                        String alias = trust.aliases().nextElement();
                        keyJKSStore.setCertificateEntry(alias, trust.getCertificate(alias));
                        trust.deleteEntry(alias);
                    }
                } catch (KeyStoreException e) {
                }

            }
        } catch (KeyStoreException e) {
            e.printStackTrace();  
        }
        return keyJKSStore;
    }


    private static KeyStore getKeyJKSStore(String keyStoreFileName, String keyStorePassword) {
        KeyStore jKeyStore = null;
        try {


            if (keyStorePassword != null && keyStorePassword.length() > 0
                    && keyStoreFileName != null && keyStoreFileName.length() > 0) {
                jKeyStore = KeyStore.getInstance("JKS");
                File file = new File(keyStoreFileName);
                FileInputStream inStream = new FileInputStream(file);
                jKeyStore.load(inStream, keyStorePassword.toCharArray());

            }
        } catch (KeyStoreException e) {
        } catch (FileNotFoundException e) {
        } catch (CertificateException e) {
        } catch (NoSuchAlgorithmException e) {
        } catch (IOException e) {
        }

        return jKeyStore;
    }

    protected X509TrustManager getTrustManager() throws NoSuchAlgorithmException, KeyStoreException {
        return new EasyX509TrustManager(getKeyStore());
    }

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

    /**
     * @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 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
     */
    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();
        SocketFactory socketfactory = getSSLContext().getSocketFactory();
        if (timeout == 0) {
            return socketfactory.createSocket(host, port, localAddress, localPort);
        } else {

            Socket socket = socketfactory.createSocket();
            SocketAddress localaddr = new InetSocketAddress(localAddress, localPort);
            SocketAddress remoteaddr = new InetSocketAddress(host, port);
            socket.bind(localaddr);
            socket.connect(remoteaddr, timeout);
            return socket;
        }
    }

    /**
     * @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(EasySSLProtocolSocketFactory.class));
    }

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

}