org.apache.gobblin.util.DownloadUtils.java Source code

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Here is the source code for org.apache.gobblin.util.DownloadUtils.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.gobblin.util;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URI;
import java.net.URL;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Map;

import com.google.common.collect.Maps;
import com.google.common.io.Resources;

import groovy.grape.Grape;
import groovy.lang.GroovyClassLoader;

/**
 * Utility class for downloads using grape
 */
public class DownloadUtils {
    public static final String IVY_SETTINGS_FILE_NAME = "ivysettings.xml";

    /**
     * Download jar through {@link Grape} given an org, module and version
     * It is assumed that an ivy settings file exists on the classpath
     */
    public static URI[] downloadJar(String org, String module, String version, boolean transitive)
            throws IOException {
        Map<String, Object> artifactMap = Maps.newHashMap();
        artifactMap.put("org", org);
        artifactMap.put("module", module);
        artifactMap.put("version", version);
        artifactMap.put("transitive", transitive);
        return downloadJar(artifactMap);
    }

    public static URI[] downloadJar(Map<String, Object> artifactMap) throws IOException {
        System.setProperty("grape.config", getIvySettingsFile().getAbsolutePath());

        Map<String, Object> args = Maps.newHashMap();
        args.put("classLoader", AccessController.doPrivileged(new PrivilegedAction<GroovyClassLoader>() {
            @Override
            public GroovyClassLoader run() {
                return new GroovyClassLoader();
            }
        }));
        return Grape.resolve(args, artifactMap);
    }

    /**
     * Get ivy settings file from classpath
     */
    public static File getIvySettingsFile() throws IOException {
        URL settingsUrl = Thread.currentThread().getContextClassLoader().getResource(IVY_SETTINGS_FILE_NAME);
        if (settingsUrl == null) {
            throw new IOException("Failed to find " + IVY_SETTINGS_FILE_NAME + " from class path");
        }

        // Check if settingsUrl is file on classpath
        File ivySettingsFile = new File(settingsUrl.getFile());
        if (ivySettingsFile.exists()) {
            // can access settingsUrl as a file
            return ivySettingsFile;
        }

        // Create temporary Ivy settings file.
        ivySettingsFile = File.createTempFile("ivy.settings", ".xml");
        ivySettingsFile.deleteOnExit();

        try (OutputStream os = new BufferedOutputStream(new FileOutputStream(ivySettingsFile))) {
            Resources.copy(settingsUrl, os);
        }

        return ivySettingsFile;
    }
}