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.cli.app;
018
019import java.io.IOException;
020import java.io.InputStream;
021import java.util.jar.Manifest;
022
023import javax.servlet.ServletContext;
024import javax.servlet.ServletException;
025
026import org.springframework.boot.builder.SpringApplicationBuilder;
027import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
028
029/**
030 * {@link SpringBootServletInitializer} for CLI packaged WAR files.
031 *
032 * @author Phillip Webb
033 * @since 1.3.0
034 */
035public class SpringApplicationWebApplicationInitializer
036                extends SpringBootServletInitializer {
037
038        /**
039         * The entry containing the source class.
040         */
041        public static final String SOURCE_ENTRY = "Spring-Application-Source-Classes";
042
043        private String[] sources;
044
045        @Override
046        public void onStartup(ServletContext servletContext) throws ServletException {
047                try {
048                        this.sources = getSources(servletContext);
049                }
050                catch (IOException ex) {
051                        throw new IllegalStateException(ex);
052                }
053                super.onStartup(servletContext);
054        }
055
056        private String[] getSources(ServletContext servletContext) throws IOException {
057                Manifest manifest = getManifest(servletContext);
058                if (manifest == null) {
059                        throw new IllegalStateException("Unable to read manifest");
060                }
061                String sources = manifest.getMainAttributes().getValue(SOURCE_ENTRY);
062                return sources.split(",");
063        }
064
065        private Manifest getManifest(ServletContext servletContext) throws IOException {
066                InputStream stream = servletContext.getResourceAsStream("/META-INF/MANIFEST.MF");
067                return (stream != null) ? new Manifest(stream) : null;
068        }
069
070        @Override
071        protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
072                try {
073                        ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
074                        Class<?>[] sourceClasses = new Class<?>[this.sources.length];
075                        for (int i = 0; i < this.sources.length; i++) {
076                                sourceClasses[i] = classLoader.loadClass(this.sources[i]);
077                        }
078                        return builder.sources(sourceClasses)
079                                        .properties("spring.groovy.template.check-template-location=false");
080                }
081                catch (Exception ex) {
082                        throw new IllegalStateException(ex);
083                }
084        }
085
086}