com.gs.api.accelrx.monitor.util.ManifestAttributes Maven / Gradle / Ivy

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package com.gs.api.accelrx.monitor.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.net.JarURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.jar.Attributes;
import java.util.jar.Manifest;

public class ManifestAttributes {
    private static final Logger logger = LoggerFactory.getLogger(ManifestAttributes.class);

    public static final String IMPLEMENTATION_VERSION = "Implementation-Version";
    public static final String BUILD_JDK_SPEC = "Build-Jdk-Spec";
    public static final String BUILD_DATE = "Build-Date";
    public static final String BUILD_NUMBER = "Build-Number";
    public static final String PIPELINE_URL = "Pipeline-Url";
    public static final String COMMIT_REVISION = "Commit-Revision";

    private static final String[] DEFAULT_ATTRIBUTES = {
            IMPLEMENTATION_VERSION,
            BUILD_JDK_SPEC,
            BUILD_DATE,
            BUILD_NUMBER,
            PIPELINE_URL,
            COMMIT_REVISION
    };

    private static final Map manifestAttributes = Collections.unmodifiableMap(classManifestAttributes());

    public static Map get() {
        return manifestAttributes;
    }

    private static Map classManifestAttributes() {
        Map aboutProperties = new HashMap<>();
        try {
            URL resource = ManifestAttributes.class.getResource(ManifestAttributes.class.getSimpleName() + ".class");
            URLConnection urlConnection = resource == null ? null : resource.openConnection();
            if (urlConnection instanceof JarURLConnection) {
                JarURLConnection jarURLConnection = (JarURLConnection) urlConnection;
                Manifest manifest = jarURLConnection.getManifest();
                Attributes mainAttributes = manifest.getMainAttributes();
                for (String attributeName : DEFAULT_ATTRIBUTES) {
                    copyAttribute(mainAttributes, aboutProperties, attributeName);
                }
            } else {
                logger.warn("Not starting from JAR, so no manifest attributes");
            }
        } catch (IOException e) {
            logger.warn("Failed to load manifest attributes!", e);
        }
        return aboutProperties;
    }

    private static void copyAttribute(Attributes from, Map to, String key) {
        String value = from.getValue(key);
        to.put(key, value != null ? value : "");
    }
}