From 9507f2f8d2ec616f01f5ee8825106300b95e8ddc Mon Sep 17 00:00:00 2001
From: Andrew Gauld <agauld@att.com>
Date: Fri, 7 Feb 2020 15:00:39 +0000
Subject: Add DCAE MOD design tool project

Change-Id: I660b28ebfaa7e4b5f03a1df5fd17d126f58b7c14
Issue-ID: DCAEGEN2-1860
Signed-off-by: Andrew Gauld <agauld@att.com>
---
 .../java/org/apache/nifi/nar/DCAEClassLoaders.java | 127 +++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 mod/designtool/designtool-web/src/main/java/org/apache/nifi/nar/DCAEClassLoaders.java

(limited to 'mod/designtool/designtool-web/src/main/java/org/apache/nifi/nar/DCAEClassLoaders.java')

diff --git a/mod/designtool/designtool-web/src/main/java/org/apache/nifi/nar/DCAEClassLoaders.java b/mod/designtool/designtool-web/src/main/java/org/apache/nifi/nar/DCAEClassLoaders.java
new file mode 100644
index 0000000..a4dbe77
--- /dev/null
+++ b/mod/designtool/designtool-web/src/main/java/org/apache/nifi/nar/DCAEClassLoaders.java
@@ -0,0 +1,127 @@
+/*-
+ * ============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;
+     }
+
+}
-- 
cgit 1.2.3-korg