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MavenWrapperDownloader.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.
*/
import java.io.IOException;
import java.io.InputStream;
import java.net.Authenticator;
import java.net.PasswordAuthentication;
import java.net.URI;
import java.net.URL;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.util.concurrent.ThreadLocalRandom;
public final class MavenWrapperDownloader {
private static final String WRAPPER_VERSION = "3.3.1";
private static final boolean VERBOSE = Boolean.parseBoolean(System.getenv("MVNW_VERBOSE"));
public static void main(String[] args) {
log("Apache Maven Wrapper Downloader " + WRAPPER_VERSION);
if (args.length != 2) {
System.err.println(" - ERROR wrapperUrl or wrapperJarPath parameter missing");
System.exit(1);
}
try {
log(" - Downloader started");
final URL wrapperUrl = URI.create(args[0]).toURL();
final String jarPath = args[1].replace("..", ""); // Sanitize path
final Path wrapperJarPath = Paths.get(jarPath).toAbsolutePath().normalize();
downloadFileFromURL(wrapperUrl, wrapperJarPath);
log("Done");
} catch (IOException e) {
System.err.println("- Error downloading: " + e.getMessage());
if (VERBOSE) {
e.printStackTrace();
}
System.exit(1);
}
}
private static void downloadFileFromURL(URL wrapperUrl, Path wrapperJarPath)
throws IOException {
log(" - Downloading to: " + wrapperJarPath);
if (System.getenv("MVNW_USERNAME") != null && System.getenv("MVNW_PASSWORD") != null) {
final String username = System.getenv("MVNW_USERNAME");
final char[] password = System.getenv("MVNW_PASSWORD").toCharArray();
Authenticator.setDefault(new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(username, password);
}
});
}
Path temp = wrapperJarPath
.getParent()
.resolve(wrapperJarPath.getFileName() + "."
+ Long.toUnsignedString(ThreadLocalRandom.current().nextLong()) + ".tmp");
try (InputStream inStream = wrapperUrl.openStream()) {
Files.copy(inStream, temp, StandardCopyOption.REPLACE_EXISTING);
Files.move(temp, wrapperJarPath, StandardCopyOption.REPLACE_EXISTING);
} finally {
Files.deleteIfExists(temp);
}
log(" - Downloader complete");
}
private static void log(String msg) {
if (VERBOSE) {
System.out.println(msg);
}
}
}