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/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project 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.jboss.netty.handler.ssl;

import org.eclipse.jetty.npn.NextProtoNego;
import org.eclipse.jetty.npn.NextProtoNego.ClientProvider;
import org.eclipse.jetty.npn.NextProtoNego.ServerProvider;

import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLEngineResult;
import javax.net.ssl.SSLEngineResult.HandshakeStatus;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLParameters;
import javax.net.ssl.SSLSession;
import java.nio.ByteBuffer;
import java.util.List;

final class JettyNpnSslEngine extends SSLEngine {

    private static boolean available;

    static boolean isAvailable() {
        updateAvailability();
        return available;
    }

    private static void updateAvailability() {
        if (available) {
            return;
        }
        try {
            // Try to get the bootstrap class loader.
            ClassLoader bootloader = ClassLoader.getSystemClassLoader().getParent();
            if (bootloader == null) {
                // If failed, use the system class loader,
                // although it's not perfect to tell if NPN extension has been loaded.
                bootloader = ClassLoader.getSystemClassLoader();
            }
            Class.forName("sun.security.ssl.NextProtoNegoExtension", true, bootloader);
            available = true;
        } catch (Exception ignore) {
            // npn-boot was not loaded.
        }
    }

    private final SSLEngine engine;
    private final JettyNpnSslSession session;

    JettyNpnSslEngine(SSLEngine engine, final List nextProtocols, boolean server) {
        assert !nextProtocols.isEmpty();

        this.engine = engine;
        session = new JettyNpnSslSession(engine);

        if (server) {
            NextProtoNego.put(engine, new ServerProvider() {
                public void unsupported() {
                    getSession().setApplicationProtocol(nextProtocols.get(nextProtocols.size() - 1));
                }

                public List protocols() {
                    return nextProtocols;
                }

                public void protocolSelected(String protocol) {
                    getSession().setApplicationProtocol(protocol);
                }
            });
        } else {
            final String[] list = nextProtocols.toArray(new String[nextProtocols.size()]);
            final String fallback = list[list.length - 1];

            NextProtoNego.put(engine, new ClientProvider() {
                public boolean supports() {
                    return true;
                }

                public void unsupported() {
                    session.setApplicationProtocol(null);
                }

                public String selectProtocol(List protocols) {
                    for (String p: list) {
                        if (protocols.contains(p)) {
                            return p;
                        }
                    }
                    return fallback;
                }
            });
        }
    }

    @Override
    public JettyNpnSslSession getSession() {
        return session;
    }

    @Override
    public void closeInbound() throws SSLException {
        NextProtoNego.remove(engine);
        engine.closeInbound();
    }

    @Override
    public void closeOutbound() {
        NextProtoNego.remove(engine);
        engine.closeOutbound();
    }

    @Override
    public String getPeerHost() {
        return engine.getPeerHost();
    }

    @Override
    public int getPeerPort() {
        return engine.getPeerPort();
    }

    @Override
    public SSLEngineResult wrap(ByteBuffer byteBuffer, ByteBuffer byteBuffer2) throws SSLException {
        return engine.wrap(byteBuffer, byteBuffer2);
    }

    @Override
    public SSLEngineResult wrap(ByteBuffer[] byteBuffers, ByteBuffer byteBuffer) throws SSLException {
        return engine.wrap(byteBuffers, byteBuffer);
    }

    @Override
    public SSLEngineResult wrap(ByteBuffer[] byteBuffers, int i, int i2, ByteBuffer byteBuffer) throws SSLException {
        return engine.wrap(byteBuffers, i, i2, byteBuffer);
    }

    @Override
    public SSLEngineResult unwrap(ByteBuffer byteBuffer, ByteBuffer byteBuffer2) throws SSLException {
        return engine.unwrap(byteBuffer, byteBuffer2);
    }

    @Override
    public SSLEngineResult unwrap(ByteBuffer byteBuffer, ByteBuffer[] byteBuffers) throws SSLException {
        return engine.unwrap(byteBuffer, byteBuffers);
    }

    @Override
    public SSLEngineResult unwrap(ByteBuffer byteBuffer, ByteBuffer[] byteBuffers, int i, int i2) throws SSLException {
        return engine.unwrap(byteBuffer, byteBuffers, i, i2);
    }

    @Override
    public Runnable getDelegatedTask() {
        return engine.getDelegatedTask();
    }

    @Override
    public boolean isInboundDone() {
        return engine.isInboundDone();
    }

    @Override
    public boolean isOutboundDone() {
        return engine.isOutboundDone();
    }

    @Override
    public String[] getSupportedCipherSuites() {
        return engine.getSupportedCipherSuites();
    }

    @Override
    public String[] getEnabledCipherSuites() {
        return engine.getEnabledCipherSuites();
    }

    @Override
    public void setEnabledCipherSuites(String[] strings) {
        engine.setEnabledCipherSuites(strings);
    }

    @Override
    public String[] getSupportedProtocols() {
        return engine.getSupportedProtocols();
    }

    @Override
    public String[] getEnabledProtocols() {
        return engine.getEnabledProtocols();
    }

    @Override
    public void setEnabledProtocols(String[] strings) {
        engine.setEnabledProtocols(strings);
    }

    @Override
    public SSLSession getHandshakeSession() {
        return engine.getHandshakeSession();
    }

    @Override
    public void beginHandshake() throws SSLException {
        engine.beginHandshake();
    }

    @Override
    public HandshakeStatus getHandshakeStatus() {
        return engine.getHandshakeStatus();
    }

    @Override
    public void setUseClientMode(boolean b) {
        engine.setUseClientMode(b);
    }

    @Override
    public boolean getUseClientMode() {
        return engine.getUseClientMode();
    }

    @Override
    public void setNeedClientAuth(boolean b) {
        engine.setNeedClientAuth(b);
    }

    @Override
    public boolean getNeedClientAuth() {
        return engine.getNeedClientAuth();
    }

    @Override
    public void setWantClientAuth(boolean b) {
        engine.setWantClientAuth(b);
    }

    @Override
    public boolean getWantClientAuth() {
        return engine.getWantClientAuth();
    }

    @Override
    public void setEnableSessionCreation(boolean b) {
        engine.setEnableSessionCreation(b);
    }

    @Override
    public boolean getEnableSessionCreation() {
        return engine.getEnableSessionCreation();
    }

    @Override
    public SSLParameters getSSLParameters() {
        return engine.getSSLParameters();
    }

    @Override
    public void setSSLParameters(SSLParameters sslParameters) {
        engine.setSSLParameters(sslParameters);
    }
}