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package org.bouncycastle.jsse.provider;

import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Method;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.concurrent.atomic.AtomicInteger;

import javax.net.ssl.SSLParameters;
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocket;

import org.bouncycastle.jsse.BCExtendedSSLSession;
import org.bouncycastle.jsse.BCSSLParameters;
import org.bouncycastle.jsse.BCSSLSocket;

abstract class SSLSocketUtil
{
    private static AtomicInteger threadNumber = new AtomicInteger();

    private static final Method getHandshakeSession;
    private static final Method getSSLParameters;
    private static final boolean useSocket8;

    static
    {
        Method[] methods = ReflectionUtil.getMethods("javax.net.ssl.SSLSocket");

        getHandshakeSession = ReflectionUtil.findMethod(methods, "getHandshakeSession");
        getSSLParameters = ReflectionUtil.findMethod(methods, "getSSLParameters");

        // Note that we only need this for the 8u251 update with ALPN methods
        useSocket8 = ReflectionUtil.hasMethod(methods, "getApplicationProtocol");
    }

    /** This factory method is the one used (only) by ProvSSLServerSocket */
    static ProvSSLSocketDirect create(ContextData contextData, boolean enableSessionCreation,
        boolean useClientMode, ProvSSLParameters sslParameters)
    {
        return useSocket8
            ?   new ProvSSLSocketDirect_8(contextData, enableSessionCreation, useClientMode, sslParameters)
            :   new ProvSSLSocketDirect(contextData, enableSessionCreation, useClientMode, sslParameters);
    }

    static ProvSSLSocketDirect create(ContextData contextData)
    {
        return useSocket8
            ?   new ProvSSLSocketDirect_8(contextData)
            :   new ProvSSLSocketDirect(contextData);
    }

    static ProvSSLSocketDirect create(ContextData contextData, InetAddress address, int port,
        InetAddress clientAddress, int clientPort) throws IOException
    {
        return useSocket8
            ?   new ProvSSLSocketDirect_8(contextData, address, port, clientAddress, clientPort)
            :   new ProvSSLSocketDirect(contextData, address, port, clientAddress, clientPort);
    }

    static ProvSSLSocketDirect create(ContextData contextData, InetAddress address, int port)
        throws IOException
    {
        return useSocket8
            ?   new ProvSSLSocketDirect_8(contextData, address, port)
            :   new ProvSSLSocketDirect(contextData, address, port);
    }

    static ProvSSLSocketDirect create(ContextData contextData, String host, int port, InetAddress clientAddress, int clientPort)
        throws IOException, UnknownHostException
    {
        return useSocket8
            ?   new ProvSSLSocketDirect_8(contextData, host, port, clientAddress, clientPort)
            :   new ProvSSLSocketDirect(contextData, host, port, clientAddress, clientPort);
    }

    static ProvSSLSocketDirect create(ContextData contextData, String host, int port) throws IOException, UnknownHostException
    {
        return useSocket8
            ?   new ProvSSLSocketDirect_8(contextData, host, port)
            :   new ProvSSLSocketDirect(contextData, host, port);
    }

    static ProvSSLSocketWrap create(ContextData contextData, Socket s, InputStream consumed, boolean autoClose)
        throws IOException
    {
        return useSocket8
            ?   new ProvSSLSocketWrap_8(contextData, s, consumed, autoClose)
            :   new ProvSSLSocketWrap(contextData, s, consumed, autoClose);
    }

    static ProvSSLSocketWrap create(ContextData contextData, Socket s, String host, int port, boolean autoClose)
        throws IOException
    {
        return useSocket8
            ?   new ProvSSLSocketWrap_8(contextData, s, host, port, autoClose)
            :   new ProvSSLSocketWrap(contextData, s, host, port, autoClose);
    }

    static void handshakeCompleted(Runnable notifyRunnable)
    {
        String name = "BCJSSE-HandshakeCompleted-" + (threadNumber.getAndIncrement() & 0x7FFFFFFF);

        // Can't be a daemon thread
        new Thread(notifyRunnable, name).start();
    }

    static BCExtendedSSLSession importHandshakeSession(SSLSocket sslSocket)
    {
        if (sslSocket instanceof BCSSLSocket)
        {
            return ((BCSSLSocket)sslSocket).getBCHandshakeSession();
        }
        if (null != sslSocket && null != getHandshakeSession)
        {
            SSLSession sslSession = (SSLSession)ReflectionUtil.invokeGetter(sslSocket, getHandshakeSession);
            if (null != sslSession)
            {
                return SSLSessionUtil.importSSLSession(sslSession);
            }
        }
        return null;
    }

    static BCSSLParameters importSSLParameters(SSLSocket sslSocket)
    {
        if (sslSocket instanceof BCSSLSocket)
        {
            return ((BCSSLSocket)sslSocket).getParameters();
        }
        if (null == sslSocket || null == getSSLParameters)
        {
            return null;
        }

        SSLParameters sslParameters = (SSLParameters)ReflectionUtil.invokeGetter(sslSocket, getSSLParameters);
        if (null == sslParameters)
        {
            throw new RuntimeException("SSLSocket.getSSLParameters returned null");
        }

        return SSLParametersUtil.importSSLParameters(sslParameters);
    }
}