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The Adobe Experience Manager SDK

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// 
// ========================================================================
// Copyright (c) 1995-2022 Mort Bay Consulting Pty Ltd and others.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// 
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
// 
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// 
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
// 
package org.eclipse.jetty.util;

import java.io.File;
import java.net.URL;
import java.security.CodeSource;
import java.util.Optional;
import java.util.jar.JarFile;
import java.util.jar.Manifest;

// @deprecated The Eclipse Jetty and Apache Felix Http Jetty packages are no longer supported.
@Deprecated(since = "2021-05-27")
public class ManifestUtils {

    private ManifestUtils() {
    }

    public static Optional getManifest(Class klass) {
        try {
            CodeSource codeSource = klass.getProtectionDomain().getCodeSource();
            if (codeSource != null) {
                URL location = codeSource.getLocation();
                if (location != null) {
                    try (JarFile jarFile = new JarFile(new File(location.toURI()))) {
                        return Optional.of(jarFile.getManifest());
                    }
                }
            }
            return Optional.empty();
        } catch (Throwable x) {
            return Optional.empty();
        }
    }

    /**
     * Attempts to return the version of the jar/module for the given class.
     * First, retrieves the {@code Implementation-Version} main attribute of the manifest;
     * if that is missing, retrieves the JPMS module version (via reflection);
     * if that is missing, returns an empty Optional.
     *
     * @param klass the class of the jar/module to retrieve the version
     * @return the jar/module version, or an empty Optional
     */
    public static Optional getVersion(Class klass) {
        Optional version = getManifest(klass).map(Manifest::getMainAttributes).map(attributes -> attributes.getValue("Implementation-Version"));
        if (version.isPresent())
            return version;
        try {
            Object module = klass.getClass().getMethod("getModule").invoke(klass);
            Object descriptor = module.getClass().getMethod("getDescriptor").invoke(module);
            return (Optional) descriptor.getClass().getMethod("rawVersion").invoke(descriptor);
        } catch (Throwable x) {
            return Optional.empty();
        }
    }
}