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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Copyright 2015 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 io.netty.handler.ssl;

import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;

/**
 * Configures a {@link ChannelPipeline} depending on the application-level protocol negotiation result of
 * {@link SslHandler}.  For example, you could configure your HTTP pipeline depending on the result of ALPN:
 *  * public class MyInitializer extends {@link ChannelInitializer}<{@link Channel}> {
 *     private final {@link SslContext} sslCtx;
 *
 *     public MyInitializer({@link SslContext} sslCtx) {
 *         this.sslCtx = sslCtx;
 *     }
 *
 *     protected void initChannel({@link Channel} ch) {
 *         {@link ChannelPipeline} p = ch.pipeline();
 *         p.addLast(sslCtx.newHandler(...)); // Adds {@link SslHandler}
 *         p.addLast(new MyNegotiationHandler());
 *     }
 * }
 *
 * public class MyNegotiationHandler extends {@link ApplicationProtocolNegotiationHandler} {
 *     public MyNegotiationHandler() {
 *         super({@link ApplicationProtocolNames}.HTTP_1_1);
 *     }
 *
 *     protected void configurePipeline({@link ChannelHandlerContext} ctx, String protocol) {
 *         if ({@link ApplicationProtocolNames}.HTTP_2.equals(protocol) {
 *             configureHttp2(ctx);
 *         } else if ({@link ApplicationProtocolNames}.HTTP_1_1.equals(protocol)) {
 *             configureHttp1(ctx);
 *         } else {
 *             throw new IllegalStateException("unknown protocol: " + protocol);
 *         }
 *     }
 * }
 * 
 */
public abstract class ApplicationProtocolNegotiationHandler extends ChannelInboundHandlerAdapter {

    private static final InternalLogger logger =
            InternalLoggerFactory.getInstance(ApplicationProtocolNegotiationHandler.class);

    private final String fallbackProtocol;
    private SslHandler sslHandler;

    /**
     * Creates a new instance with the specified fallback protocol name.
     *
     * @param fallbackProtocol the name of the protocol to use when
     *                         ALPN/NPN negotiation fails or the client does not support ALPN/NPN
     */
    protected ApplicationProtocolNegotiationHandler(String fallbackProtocol) {
        this.fallbackProtocol = ObjectUtil.checkNotNull(fallbackProtocol, "fallbackProtocol");
    }

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        // FIXME: There is no way to tell if the SSL handler is placed before the negotiation handler.
        final SslHandler sslHandler = ctx.pipeline().get(SslHandler.class);
        if (sslHandler == null) {
            throw new IllegalStateException(
                    "cannot find a SslHandler in the pipeline (required for application-level protocol negotiation)");
        }

        this.sslHandler = sslHandler;
    }

    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
        if (evt instanceof SslHandshakeCompletionEvent) {
            ctx.pipeline().remove(this);

            SslHandshakeCompletionEvent handshakeEvent = (SslHandshakeCompletionEvent) evt;
            if (handshakeEvent.isSuccess()) {
                String protocol = sslHandler.applicationProtocol();
                configurePipeline(ctx, protocol != null? protocol : fallbackProtocol);
            } else {
                logger.warn("{} TLS handshake failed:", ctx.channel(), handshakeEvent.cause());
                ctx.close();
            }
        }

        ctx.fireUserEventTriggered(evt);
    }

    /**
     * Invoked on successful initial SSL/TLS handshake. Implement this method to configure your pipeline
     * for the negotiated application-level protocol.
     *
     * @param protocol the name of the negotiated application-level protocol, or
     *                 the fallback protocol name specified in the constructor call if negotiation failed or the client
     *                 isn't aware of ALPN/NPN extension
     */
    protected abstract void configurePipeline(ChannelHandlerContext ctx, String protocol) throws Exception;

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        logger.warn("{} Failed to select the application-level protocol:", ctx.channel(), cause);
        ctx.close();
    }
}