ManagementProxyResource.java

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// Portions Copyright [2016] [Payara Foundation]

package org.glassfish.admin.rest.resources.custom;

import org.glassfish.admin.rest.results.ActionReportResult;
import org.glassfish.admin.rest.utils.ProxyImpl;
import org.glassfish.admin.rest.utils.xml.RestActionReporter;
import org.jvnet.hk2.config.Dom;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.PathSegment;
import javax.ws.rs.core.UriBuilder;
import javax.ws.rs.core.UriInfo;
import java.net.URL;
import java.util.List;
import java.util.Properties;
import org.glassfish.admin.rest.utils.Util;
import org.glassfish.hk2.api.ServiceLocator;

/**
 * @author Mitesh Meswani
 */
@Produces({MediaType.TEXT_HTML, MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML})
@Path("domain/proxy/{path:.*}")
public class ManagementProxyResource {
    @Context
    protected UriInfo uriInfo;

    @Context
    protected ServiceLocator habitat;

    @GET
    public ActionReportResult proxyRequest() {

        RestActionReporter ar = new RestActionReporter();
        ar.setActionDescription("Proxied Data");
        ar.setSuccess();

        ActionReportResult result = new ActionReportResult(ar);

        Properties proxiedResponse = new ManagementProxyImpl().proxyRequest(uriInfo, Util.getJerseyClient(), habitat);
        ar.setExtraProperties(proxiedResponse);
        return result;
    }

    private static class ManagementProxyImpl extends ProxyImpl {
        private static int TARGET_INSTANCE_NAME_PATH_INDEX = 2; //pathSegments == { "domain", "proxy", "instanceName", ....}

        @Override
        public UriBuilder constructTargetURLPath(UriInfo sourceUriInfo, URL responseURLReceivedFromTarget) {
            return sourceUriInfo.getBaseUriBuilder().replacePath(responseURLReceivedFromTarget.getFile());
        }

        @Override
        public UriBuilder constructForwardURLPath(UriInfo sourceUriInfo) {
            // The sourceURI is of the form /mangement/domain/proxy/<instanceName>/forwardSegment1/forwardSegment2/....
            // The forwardURI constructed is of the form /mangement/domain/forwardSegment1/forwardSegment2/....
            List<PathSegment> sourcePathSegments = sourceUriInfo.getPathSegments();
            List<PathSegment> forwardPathSegmentsHead =  sourcePathSegments.subList(0, TARGET_INSTANCE_NAME_PATH_INDEX - 1); //path that precedes proxy/<instancenName>
            List<PathSegment> forwardPathSegmentsTail =  sourcePathSegments.subList(TARGET_INSTANCE_NAME_PATH_INDEX + 1, sourcePathSegments.size()); //path that follows <instanceName>
            UriBuilder forwardUriBuilder = sourceUriInfo.getBaseUriBuilder(); // Gives /management/domain
            for (PathSegment pathSegment : forwardPathSegmentsHead) { //append domain
                forwardUriBuilder.segment(pathSegment.getPath());
            }

            for (PathSegment pathSegment : forwardPathSegmentsTail) { //append forwardSegment1/forwardSegment2/....
                forwardUriBuilder.segment(pathSegment.getPath());
            }
            return forwardUriBuilder;
        }

        @Override
        public String extractTargetInstanceName(UriInfo uriInfo) {
            return uriInfo.getPathSegments().get(TARGET_INSTANCE_NAME_PATH_INDEX).getPath();
        }
    }

    public void setEntity(Dom p) {
        // ugly no-op hack to keep the generated code happy.
    }

}