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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 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 io.netty.handler.proxy;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPipeline;
import io.netty.handler.codec.base64.Base64;
import io.netty.handler.codec.http.DefaultFullHttpRequest;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.HttpClientCodec;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpMethod;
import io.netty.handler.codec.http.HttpResponse;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http.HttpUtil;
import io.netty.handler.codec.http.HttpVersion;
import io.netty.handler.codec.http.LastHttpContent;
import io.netty.util.AsciiString;
import io.netty.util.CharsetUtil;

import java.net.InetSocketAddress;
import java.net.SocketAddress;

public final class HttpProxyHandler extends ProxyHandler {

    private static final String PROTOCOL = "http";
    private static final String AUTH_BASIC = "basic";

    private final HttpClientCodec codec = new HttpClientCodec();
    private final String username;
    private final String password;
    private final CharSequence authorization;
    private final boolean ignoreDefaultPortsInConnectHostHeader;
    private HttpResponseStatus status;
    private HttpHeaders headers;

    public HttpProxyHandler(SocketAddress proxyAddress) {
        this(proxyAddress, null);
    }

    public HttpProxyHandler(SocketAddress proxyAddress, HttpHeaders headers) {
        this(proxyAddress, headers, false);
    }

    public HttpProxyHandler(SocketAddress proxyAddress,
                            HttpHeaders headers,
                            boolean ignoreDefaultPortsInConnectHostHeader) {
        super(proxyAddress);
        username = null;
        password = null;
        authorization = null;
        this.headers = headers;
        this.ignoreDefaultPortsInConnectHostHeader = ignoreDefaultPortsInConnectHostHeader;
    }

    public HttpProxyHandler(SocketAddress proxyAddress, String username, String password) {
        this(proxyAddress, username, password, null);
    }

    public HttpProxyHandler(SocketAddress proxyAddress, String username, String password,
                            HttpHeaders headers) {
        this(proxyAddress, username, password, headers, false);
    }

    public HttpProxyHandler(SocketAddress proxyAddress,
                            String username,
                            String password,
                            HttpHeaders headers,
                            boolean ignoreDefaultPortsInConnectHostHeader) {
        super(proxyAddress);
        if (username == null) {
            throw new NullPointerException("username");
        }
        if (password == null) {
            throw new NullPointerException("password");
        }
        this.username = username;
        this.password = password;

        ByteBuf authz = Unpooled.copiedBuffer(username + ':' + password, CharsetUtil.UTF_8);
        ByteBuf authzBase64 = Base64.encode(authz, false);

        authorization = new AsciiString("Basic " + authzBase64.toString(CharsetUtil.US_ASCII));

        authz.release();
        authzBase64.release();

        this.headers = headers;
        this.ignoreDefaultPortsInConnectHostHeader = ignoreDefaultPortsInConnectHostHeader;
    }

    @Override
    public String protocol() {
        return PROTOCOL;
    }

    @Override
    public String authScheme() {
        return authorization != null? AUTH_BASIC : AUTH_NONE;
    }

    public String username() {
        return username;
    }

    public String password() {
        return password;
    }

    @Override
    protected void addCodec(ChannelHandlerContext ctx) throws Exception {
        ChannelPipeline p = ctx.pipeline();
        String name = ctx.name();
        p.addBefore(name, null, codec);
    }

    @Override
    protected void removeEncoder(ChannelHandlerContext ctx) throws Exception {
        codec.removeOutboundHandler();
    }

    @Override
    protected void removeDecoder(ChannelHandlerContext ctx) throws Exception {
        codec.removeInboundHandler();
    }

    @Override
    protected Object newInitialMessage(ChannelHandlerContext ctx) throws Exception {
        InetSocketAddress raddr = destinationAddress();

        String hostString = HttpUtil.formatHostnameForHttp(raddr);
        int port = raddr.getPort();
        String url = hostString + ":" + port;
        String hostHeader = (ignoreDefaultPortsInConnectHostHeader && (port == 80 || port == 443)) ?
                hostString :
                url;

        FullHttpRequest req = new DefaultFullHttpRequest(
                HttpVersion.HTTP_1_1, HttpMethod.CONNECT,
                url,
                Unpooled.EMPTY_BUFFER, false);

        req.headers().set(HttpHeaderNames.HOST, hostHeader);

        if (authorization != null) {
            req.headers().set(HttpHeaderNames.PROXY_AUTHORIZATION, authorization);
        }

        if (headers != null) {
            req.headers().add(headers);
        }

        return req;
    }

    @Override
    protected boolean handleResponse(ChannelHandlerContext ctx, Object response) throws Exception {
        if (response instanceof HttpResponse) {
            if (status != null) {
                throw new ProxyConnectException(exceptionMessage("too many responses"));
            }
            status = ((HttpResponse) response).status();
        }

        boolean finished = response instanceof LastHttpContent;
        if (finished) {
            if (status == null) {
                throw new ProxyConnectException(exceptionMessage("missing response"));
            }
            if (status.code() != 200) {
                throw new ProxyConnectException(exceptionMessage("status: " + status));
            }
        }

        return finished;
    }
}