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/*
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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 * 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.html
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package com.sun.grizzly.ssl;

import java.io.IOException;
import java.nio.ByteBuffer;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLEngineResult;
import javax.net.ssl.SSLEngineResult.HandshakeStatus;
import com.sun.grizzly.Buffer;

/**
 * Utility class, which implements the set of useful SSL related operations.
 * 
 * @author Alexey Stashok
 */
public class SSLUtils {

    public static SSLEngineResult unwrap(SSLEngine sslEngine,
            Buffer securedInBuffer, Buffer plainBuffer) throws IOException {
        return sslEngine.unwrap((ByteBuffer) securedInBuffer.underlying(),
                (ByteBuffer) plainBuffer.underlying());
    }

    public static SSLEngineResult wrap(SSLEngine sslEngine, Buffer plainBuffer,
            Buffer securedOutBuffer) throws IOException {
        return sslEngine.wrap((ByteBuffer) plainBuffer.underlying(),
                (ByteBuffer) securedOutBuffer.underlying());
    }

    /**
     * Complete hanshakes operations.
     * @param sslEngine The SSLEngine used to manage the SSL operations.
     * @return SSLEngineResult.HandshakeStatus
     */
    public static void executeDelegatedTask(SSLEngine sslEngine) {

        Runnable runnable;
        while ((runnable = sslEngine.getDelegatedTask()) != null) {
            runnable.run();
        }
    }


    public static boolean isHandshaking(SSLEngine sslEngine) {
        HandshakeStatus handshakeStatus = sslEngine.getHandshakeStatus();
        return !(handshakeStatus == HandshakeStatus.FINISHED ||
                handshakeStatus == HandshakeStatus.NOT_HANDSHAKING);
    }


    static void clearOrCompact(Buffer buffer) {
        if (buffer == null) {
            return;
        }

        if (!buffer.hasRemaining()) {
            buffer.clear();
        } else if (buffer.position() > 0) {
            buffer.compact();
        }
    }
}