/* * Copyright 2015-2016 Red Hat, Inc. and/or its affiliates * and other contributors as indicated by the @author tags. * * 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 * * http://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.hawkular.alerts.rest; import java.io.InputStream; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.jar.Attributes; import java.util.jar.Manifest; import javax.enterprise.context.ApplicationScoped; import javax.servlet.ServletContext; import com.google.common.collect.ImmutableList; /** * Manifest extraction. * Credits to Hawkular Metrics team. * * @author Jay Shaughnessy * @author Lucas Ponce */ @ApplicationScoped public class ManifestUtil { private static final String IMPLEMENTATION_VERSION = "Implementation-Version"; private static final String BUILT_FROM_GIT = "Built-From-Git-SHA1"; private static final List<String> VERSION_ATTRIBUTES = ImmutableList.of(IMPLEMENTATION_VERSION, BUILT_FROM_GIT); private Map<String, String> manifestInformation = new HashMap<>(); public Map<String, String> getFrom(ServletContext servletContext) { if (!manifestInformation.containsKey(IMPLEMENTATION_VERSION) && !manifestInformation.containsKey(BUILT_FROM_GIT)) { try (InputStream inputStream = servletContext.getResourceAsStream("/META-INF/MANIFEST.MF")) { Manifest manifest = new Manifest(inputStream); Attributes attr = manifest.getMainAttributes(); for (String attribute : VERSION_ATTRIBUTES) { manifestInformation.put(attribute, attr.getValue(attribute)); } } catch (Exception e) { for (String attribute : VERSION_ATTRIBUTES) { if (manifestInformation.get(attribute) == null) { manifestInformation.put(attribute, "Unknown"); } } } } return manifestInformation; } }