/*
 * 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. 
 */
package io.prestosql.plugin.password.ldap;

import javax.net. SocketFactory;
import javax.net.ssl. SSLContext;

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

import static com.google.common.base. Preconditions.checkState;
import static java.util. Objects.requireNonNull;

public final class LdapSslSocketFactory
        extends SocketFactory
{
    private static final ThreadLocal<SSLContext> SSL_CONTEXT = new ThreadLocal<>();

    private final SocketFactory socketFactory;

    public LdapSslSocketFactory(SocketFactory socketFactory)
    {
        this.socketFactory = requireNonNull(socketFactory, "socketFactory is null");
    }

    @Override
    public Socket createSocket()
            throws IOException
    {
        return socketFactory.createSocket();
    }

    @Override
    public Socket createSocket(String host, int port)
            throws IOException
    {
        return socketFactory.createSocket(host, port);
    }

    @Override
    public Socket createSocket(String host, int port, InetAddress localHost, int localPort)
            throws IOException
    {
        return socketFactory.createSocket(host, port, localHost, localPort);
    }

    @Override
    public Socket createSocket(InetAddress host, int port)
            throws IOException
    {
        return socketFactory.createSocket(host, port);
    }

    @Override
    public Socket createSocket(InetAddress address, int port, InetAddress localAddress, int localPort)
            throws IOException
    {
        return socketFactory.createSocket(address, port, localAddress, localPort);
    }

    // entry point per https://docs.oracle.com/javase/jndi/tutorial/ldap/security/ssl.html
    @SuppressWarnings({"unused", "MethodOverridesStaticMethodOfSuperclass"})
    public static SocketFactory getDefault()
    {
        SSLContext sslContext = SSL_CONTEXT.get();
        checkState(sslContext ! = null, "SSLContext was not set");
        return new LdapSslSocketFactory(sslContext.getSocketFactory());
    }

    public static void setSslContextForCurrentThread(SSLContext sslContext)
    {
        SSL_CONTEXT.set(sslContext);
    }
}
