GwtRpcController.java

/*
 Copyright (c) 2012 GFT Appverse, S.L., Sociedad Unipersonal.

 This Source Code Form is subject to the terms of the Appverse Public License 
 Version 2.0 (“APL v2.0”). If a copy of the APL was not distributed with this 
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 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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package org.appverse.web.framework.backend.frontfacade.gxt.controllers;

import com.google.gwt.user.client.rpc.RemoteService;
import com.google.gwt.user.client.rpc.SerializationException;
import com.google.gwt.user.server.rpc.RPC;
import com.google.gwt.user.server.rpc.RPCRequest;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;
import org.appverse.web.framework.backend.api.helpers.security.SecurityHelper;
import org.appverse.web.framework.backend.api.services.presentation.AuthenticationServiceFacade;
import org.appverse.web.framework.backend.frontfacade.gxt.services.presentation.GWTPresentationException;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

import javax.inject.Singleton;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.core.Context;

@Singleton
@Component
@Path("/")
public class GwtRpcController extends RemoteServiceServlet implements ApplicationContextAware {

	private static final long serialVersionUID = 4147354200774086984L;

    /**
     * With Jersey 2.x applicationContext is not Autowired (see https://java.net/jira/browse/JERSEY-2169)
     * It must implement ApplicationContextAware to get the ApplicationContext instance
     */
	private ApplicationContext applicationContext;

	@Autowired
	private ServletContext servletContext;
	private final ThreadLocal<String> serviceName = new ThreadLocal<String>();

	@Override
	public ServletContext getServletContext() {
		return servletContext;
	}

	@POST
	@Path("{servicemethodname}")
	public String handleRequest(
			@PathParam("servicemethodname") String servicemethodname,
			@Context HttpServletRequest request,
			@Context HttpServletResponse response) throws Exception {
		
//		String path = request.getServletPath();
		serviceName.set(servicemethodname.substring(0,
				servicemethodname.lastIndexOf('.')));
		Object presentationService = applicationContext.getBean(serviceName
				.get());
		if (!(presentationService instanceof AuthenticationServiceFacade)) {
			SecurityHelper.checkXSRFToken(request);
		}
		super.doPost(request, response);
		return "";
	}

	@Override
	public String processCall(final String payload)
			throws SerializationException {
		try {
			Object presentationService = applicationContext.getBean(serviceName
					.get());
			if (!(presentationService instanceof RemoteService)) {
				throw new IllegalArgumentException(
						"Requested Spring Bean is not a GWT RemoteService Presentation Service: "
								+ payload + " (" + presentationService + ")");
			}

			RPCRequest rpcRequest = RPC.decodeRequest(payload,
					presentationService.getClass(), this);
			if (presentationService instanceof AuthenticationServiceFacade
					&& rpcRequest.getMethod().equals(
							AuthenticationServiceFacade.class
									.getMethod("getXSRFSessionToken"))) {
				return RPC.encodeResponseForSuccess(rpcRequest.getMethod(),
						SecurityHelper.createXSRFToken(getThreadLocalRequest()));
			}
			return RPC.invokeAndEncodeResponse(presentationService,
					rpcRequest.getMethod(), rpcRequest.getParameters(),
					rpcRequest.getSerializationPolicy(), rpcRequest.getFlags());
		} catch (Exception e) {
			GWTPresentationException pex = new GWTPresentationException(
					e.getMessage());
			return RPC.encodeResponseForFailure(null, pex);
		}
	}

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }
}