001/*
002 * Copyright 2012-2018 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.boot.docs.cloudfoundry;
018
019import java.io.IOException;
020import java.util.Collections;
021
022import javax.servlet.GenericServlet;
023import javax.servlet.Servlet;
024import javax.servlet.ServletContainerInitializer;
025import javax.servlet.ServletContext;
026import javax.servlet.ServletException;
027import javax.servlet.ServletRequest;
028import javax.servlet.ServletResponse;
029
030import org.apache.catalina.Host;
031import org.apache.catalina.core.StandardContext;
032import org.apache.catalina.startup.Tomcat;
033
034import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;
035import org.springframework.boot.web.servlet.ServletContextInitializer;
036import org.springframework.context.annotation.Bean;
037
038/**
039 * Example configuration for custom context path in Cloud Foundry.
040 *
041 * @author Johnny Lim
042 */
043public class CloudFoundryCustomContextPathExample {
044
045        // tag::configuration[]
046        @Bean
047        public TomcatServletWebServerFactory servletWebServerFactory() {
048                return new TomcatServletWebServerFactory() {
049
050                        @Override
051                        protected void prepareContext(Host host,
052                                        ServletContextInitializer[] initializers) {
053                                super.prepareContext(host, initializers);
054                                StandardContext child = new StandardContext();
055                                child.addLifecycleListener(new Tomcat.FixContextListener());
056                                child.setPath("/cloudfoundryapplication");
057                                ServletContainerInitializer initializer = getServletContextInitializer(
058                                                getContextPath());
059                                child.addServletContainerInitializer(initializer, Collections.emptySet());
060                                child.setCrossContext(true);
061                                host.addChild(child);
062                        }
063
064                };
065        }
066
067        private ServletContainerInitializer getServletContextInitializer(String contextPath) {
068                return (c, context) -> {
069                        Servlet servlet = new GenericServlet() {
070
071                                @Override
072                                public void service(ServletRequest req, ServletResponse res)
073                                                throws ServletException, IOException {
074                                        ServletContext context = req.getServletContext()
075                                                        .getContext(contextPath);
076                                        context.getRequestDispatcher("/cloudfoundryapplication").forward(req,
077                                                        res);
078                                }
079
080                        };
081                        context.addServlet("cloudfoundry", servlet).addMapping("/*");
082                };
083        }
084        // end::configuration[]
085
086}