/
StaticResourceJars.java
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/
StaticResourceJars.java
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/*
* Copyright 2012-2023 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.boot.web.servlet.server;
import java.io.File;
import java.io.IOException;
import java.lang.management.ManagementFactory;
import java.net.JarURLConnection;
import java.net.MalformedURLException;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLClassLoader;
import java.net.URLConnection;
import java.nio.file.InvalidPathException;
import java.util.ArrayList;
import java.util.List;
import java.util.jar.JarFile;
import java.util.stream.Stream;
/**
* Logic to extract URLs of static resource jars (those containing
* {@code "META-INF/resources"} directories).
*
* @author Andy Wilkinson
* @author Phillip Webb
*/
class StaticResourceJars {
List<URL> getUrls() {
ClassLoader classLoader = getClass().getClassLoader();
if (classLoader instanceof URLClassLoader urlClassLoader) {
return getUrlsFrom(urlClassLoader.getURLs());
}
else {
return getUrlsFrom(Stream.of(ManagementFactory.getRuntimeMXBean().getClassPath().split(File.pathSeparator))
.map(this::toUrl)
.toArray(URL[]::new));
}
}
List<URL> getUrlsFrom(URL... urls) {
List<URL> resourceJarUrls = new ArrayList<>();
for (URL url : urls) {
addUrl(resourceJarUrls, url);
}
return resourceJarUrls;
}
private URL toUrl(String classPathEntry) {
try {
return new File(classPathEntry).toURI().toURL();
}
catch (MalformedURLException ex) {
throw new IllegalArgumentException("URL could not be created from '" + classPathEntry + "'", ex);
}
}
private File toFile(URL url) {
try {
return new File(url.toURI());
}
catch (URISyntaxException ex) {
throw new IllegalStateException("Failed to create File from URL '" + url + "'");
}
catch (IllegalArgumentException ex) {
return null;
}
}
private void addUrl(List<URL> urls, URL url) {
try {
if (!"file".equals(url.getProtocol())) {
addUrlConnection(urls, url, url.openConnection());
}
else {
File file = toFile(url);
if (file != null) {
addUrlFile(urls, url, file);
}
else {
addUrlConnection(urls, url, url.openConnection());
}
}
}
catch (IOException ex) {
throw new IllegalStateException(ex);
}
}
private void addUrlFile(List<URL> urls, URL url, File file) {
if ((file.isDirectory() && new File(file, "META-INF/resources").isDirectory()) || isResourcesJar(file)) {
urls.add(url);
}
}
private void addUrlConnection(List<URL> urls, URL url, URLConnection connection) {
if (connection instanceof JarURLConnection jarURLConnection && isResourcesJar(jarURLConnection)) {
urls.add(url);
}
}
private boolean isResourcesJar(JarURLConnection connection) {
try {
return isResourcesJar(connection.getJarFile(), !connection.getUseCaches());
}
catch (IOException ex) {
return false;
}
}
private boolean isResourcesJar(File file) {
try {
return isResourcesJar(new JarFile(file), true);
}
catch (IOException | InvalidPathException ex) {
return false;
}
}
private boolean isResourcesJar(JarFile jarFile, boolean closeJarFile) throws IOException {
try {
return jarFile.getName().endsWith(".jar") && (jarFile.getJarEntry("META-INF/resources") != null);
}
finally {
if (closeJarFile) {
jarFile.close();
}
}
}
}