io.undertow.server.handlers.proxy.ProxyHandlerBuilder Maven / Gradle / Ivy

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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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package io.undertow.server.handlers.proxy;

import io.undertow.server.HandlerWrapper;
import io.undertow.server.HttpHandler;
import io.undertow.server.handlers.builder.HandlerBuilder;

import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * @author Stuart Douglas
 */
public class ProxyHandlerBuilder implements HandlerBuilder {

    @Override
    public String name() {
        return "reverse-proxy";
    }

    @Override
    public Map> parameters() {
        Map> params = new HashMap<>();
        params.put("hosts", String[].class);
        params.put("rewrite-host-header", Boolean.class);
        return params;
    }

    @Override
    public Set requiredParameters() {
        return Collections.singleton("hosts");
    }

    @Override
    public String defaultParameter() {
        return "hosts";
    }

    @Override
    public HandlerWrapper build(Map config) {
        String[] hosts = (String[]) config.get("hosts");
        List uris = new ArrayList<>();
        for (String host : hosts) {
            try {
                uris.add(new URI(host));
            } catch (URISyntaxException e) {
                throw new RuntimeException(e);
            }
        }
        Boolean rewriteHostHeader = (Boolean) config.get("rewrite-host-header");
        return new Wrapper(uris, rewriteHostHeader);
    }

    private static class Wrapper implements HandlerWrapper {

        private final List uris;
        private final boolean rewriteHostHeader;

        private Wrapper(List uris, Boolean rewriteHostHeader) {
            this.uris = uris;
            this.rewriteHostHeader = rewriteHostHeader != null && rewriteHostHeader;
        }

        @Override
        public HttpHandler wrap(HttpHandler handler) {
            final LoadBalancingProxyClient loadBalancingProxyClient = new LoadBalancingProxyClient();
            for (URI url : uris) {
                loadBalancingProxyClient.addHost(url);
            }

            return new ProxyHandler(loadBalancingProxyClient, -1, handler, rewriteHostHeader, false);
        }
    }

}