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+/*-
+ * ============LICENSE_START=======================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+package org.apache.nifi.nar;
+
+import org.apache.nifi.bundle.Bundle;
+import org.apache.nifi.bundle.BundleCoordinate;
+import org.apache.nifi.bundle.BundleDetails;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URI;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.jar.Manifest;
+import java.util.stream.Collectors;
+
+import com.fasterxml.jackson.core.JsonFactory;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import java.util.jar.Attributes;
+
+
+/**
+ * Class responsible for loading JARs for DCAEProcessors into Nifi
+ */
+public class DCAEClassLoaders {
+
+ public static class DCAEClassLoadersError extends RuntimeException {
+ public DCAEClassLoadersError(Throwable e) {
+ super("Error while using DCAEClassLoaders", e);
+ }
+ }
+
+ /**
+ * Given a URL to a index.json file, fetches the file and generates a list of
+ * URLs for DCAE jars that has Processors packaged.
+ *
+ * @param indexDCAEJars
+ * @return
+ */
+ public static List<URL> getDCAEJarsURLs(URI indexDCAEJars) {
+ JsonFactory jf = new JsonFactory();
+ ObjectMapper om = new ObjectMapper();
+
+ try {
+ List<Object> urls = om.readValue(jf.createParser(indexDCAEJars.toURL()), List.class);
+
+ return urls.stream().map(u -> {
+ try {
+ Map<String, Object> foo = (Map<String, Object>) u;
+ String name = (String) foo.get("name");
+ String url = String.format("%s/%s", indexDCAEJars.toString(), name);
+ return new URL(url);
+ } catch (MalformedURLException e) {
+ // Hopefully you never come here...
+ return null;
+ }
+ }).collect(Collectors.toList());
+ } catch (Exception e) {
+ throw new RuntimeException("Error while getting jar URIs", e);
+ }
+ }
+
+ private static BundleDetails createBundleDetails(URLClassLoader classLoader) {
+ try {
+ URL url = classLoader.findResource("META-INF/MANIFEST.MF");
+ Manifest manifest = new Manifest(url.openStream());
+
+ final Attributes attributes = manifest.getMainAttributes();
+
+ final BundleDetails.Builder builder = new BundleDetails.Builder();
+ // NOTE: Working directory cannot be null so set it to some bogus dir
+ // because we aren't really using this. Or maybe should create our own
+ // working directory
+ builder.workingDir(new File("/tmp"));
+
+ final String group = attributes.getValue("Group");
+ final String id = attributes.getValue("Id");
+ final String version = attributes.getValue("Version");
+ builder.coordinate(new BundleCoordinate(group, id, version));
+
+ return builder.build();
+ } catch (IOException e) {
+ throw new DCAEClassLoadersError(e);
+ }
+ }
+
+ /**
+ * From a list of URLs to remote JARs where the JARs contain DCAEProcessor classes,
+ * create a bundle for each JAR. You will never get a partial list of bundles.
+ *
+ * @param jarURLs
+ * @return
+ */
+ public static Set<Bundle> createDCAEBundles(List<URL> jarURLs) {
+ Set<Bundle> bundles = new HashSet<>();
+
+ for (URL jarURL : jarURLs) {
+ URLClassLoader classLoader = new URLClassLoader(new URL[] {jarURL});
+ Bundle bundle = new Bundle(createBundleDetails(classLoader), classLoader);
+ bundles.add(bundle);
+ }
+
+ return bundles;
+ }
+
+}