org.springframework.cloud.stream.app.websocket.sink.WebsocketSinkServerInitializer.java Source code

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Here is the source code for org.springframework.cloud.stream.app.websocket.sink.WebsocketSinkServerInitializer.java

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/*
 * Copyright 2014-2016 the original author or authors.
 *
 * 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 org.springframework.cloud.stream.app.websocket.sink;

import java.security.cert.CertificateException;

import javax.net.ssl.SSLException;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.actuate.trace.TraceRepository;

import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslContextBuilder;
import io.netty.handler.ssl.util.SelfSignedCertificate;

/**
 * Does some basic initialization and setup.
 *
 * <ul>
 * <li>Configure the {@link SslContext} based on {@link WebsocketSinkProperties#ssl}</li>
 * <li>add the {@link WebsocketSinkServerHandler} to the underlying {@link ChannelPipeline}</li>
 * </ul>
 *
 * @author Oliver Moser
 * @author Gary Russell
 */
public class WebsocketSinkServerInitializer extends ChannelInitializer<SocketChannel> {

    public static final int MAX_CONTENT_LENGTH = 65536;

    private final TraceRepository traceRepository;

    @Autowired
    private WebsocketSinkProperties properties;

    @Value("${endpoints.websocketsinktrace.enabled:false}")
    private boolean traceEnabled;

    public WebsocketSinkServerInitializer(TraceRepository traceRepository) {
        this.traceRepository = traceRepository;
    }

    @Override
    public void initChannel(SocketChannel ch) throws Exception {
        ChannelPipeline pipeline = ch.pipeline();

        final SslContext sslCtx = configureSslContext();
        if (sslCtx != null) {
            pipeline.addLast(sslCtx.newHandler(ch.alloc()));
        }

        pipeline.addLast(new HttpServerCodec());
        pipeline.addLast(new HttpObjectAggregator(MAX_CONTENT_LENGTH));
        pipeline.addLast(new WebsocketSinkServerHandler(traceRepository, properties, traceEnabled));
    }

    private SslContext configureSslContext() throws CertificateException, SSLException {
        if (properties.isSsl()) {
            SelfSignedCertificate ssc = new SelfSignedCertificate();
            return SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey()).build();
        } else {
            return null;
        }
    }
}