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/*
 * Copyright 2012-2019 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;

import java.io.File;
import java.io.IOException;
import java.net.JarURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.security.CodeSource;
import java.util.jar.Attributes;
import java.util.jar.Attributes.Name;
import java.util.jar.JarFile;

/**
 * Class that exposes the Spring Boot version. Fetches the
 * {@link Name#IMPLEMENTATION_VERSION Implementation-Version} manifest attribute from the
 * jar file via {@link Package#getImplementationVersion()}, falling back to locating the
 * jar file that contains this class and reading the {@code Implementation-Version}
 * attribute from its manifest.
 * 

* This class might not be able to determine the Spring Boot version in all environments. * Consider using a reflection-based check instead: For example, checking for the presence * of a specific Spring Boot method that you intend to call. * * @author Drummond Dawson * @author Hendrig Sellik * @author Andy Wilkinson * @since 1.3.0 */ public final class SpringBootVersion { private SpringBootVersion() { } /** * Return the full version string of the present Spring Boot codebase, or {@code null} * if it cannot be determined. * @return the version of Spring Boot or {@code null} * @see Package#getImplementationVersion() */ public static String getVersion() { return determineSpringBootVersion(); } private static String determineSpringBootVersion() { String implementationVersion = SpringBootVersion.class.getPackage().getImplementationVersion(); if (implementationVersion != null) { return implementationVersion; } CodeSource codeSource = SpringBootVersion.class.getProtectionDomain().getCodeSource(); if (codeSource == null) { return null; } URL codeSourceLocation = codeSource.getLocation(); try { URLConnection connection = codeSourceLocation.openConnection(); if (connection instanceof JarURLConnection) { return getImplementationVersion(((JarURLConnection) connection).getJarFile()); } try (JarFile jarFile = new JarFile(new File(codeSourceLocation.toURI()))) { return getImplementationVersion(jarFile); } } catch (Exception ex) { return null; } } private static String getImplementationVersion(JarFile jarFile) throws IOException { return jarFile.getManifest().getMainAttributes().getValue(Attributes.Name.IMPLEMENTATION_VERSION); } }





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