2 * Copyright 2007-present the original author or authors.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * https://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 import java.nio.channels.*;
19 import java.util.Properties;
21 public class MavenWrapperDownloader {
23 private static final String WRAPPER_VERSION = "0.5.6";
25 * Default URL to download the maven-wrapper.jar from, if no 'downloadUrl' is provided.
27 private static final String DEFAULT_DOWNLOAD_URL = "https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/"
28 + WRAPPER_VERSION + "/maven-wrapper-" + WRAPPER_VERSION + ".jar";
31 * Path to the maven-wrapper.properties file, which might contain a downloadUrl property to
32 * use instead of the default one.
34 private static final String MAVEN_WRAPPER_PROPERTIES_PATH =
35 ".mvn/wrapper/maven-wrapper.properties";
38 * Path where the maven-wrapper.jar will be saved to.
40 private static final String MAVEN_WRAPPER_JAR_PATH =
41 ".mvn/wrapper/maven-wrapper.jar";
44 * Name of the property which should be used to override the default download url for the wrapper.
46 private static final String PROPERTY_NAME_WRAPPER_URL = "wrapperUrl";
48 public static void main(String args[]) {
49 System.out.println("- Downloader started");
50 File baseDirectory = new File(args[0]);
51 System.out.println("- Using base directory: " + baseDirectory.getAbsolutePath());
53 // If the maven-wrapper.properties exists, read it and check if it contains a custom
54 // wrapperUrl parameter.
55 File mavenWrapperPropertyFile = new File(baseDirectory, MAVEN_WRAPPER_PROPERTIES_PATH);
56 String url = DEFAULT_DOWNLOAD_URL;
57 if(mavenWrapperPropertyFile.exists()) {
58 FileInputStream mavenWrapperPropertyFileInputStream = null;
60 mavenWrapperPropertyFileInputStream = new FileInputStream(mavenWrapperPropertyFile);
61 Properties mavenWrapperProperties = new Properties();
62 mavenWrapperProperties.load(mavenWrapperPropertyFileInputStream);
63 url = mavenWrapperProperties.getProperty(PROPERTY_NAME_WRAPPER_URL, url);
64 } catch (IOException e) {
65 System.out.println("- ERROR loading '" + MAVEN_WRAPPER_PROPERTIES_PATH + "'");
68 if(mavenWrapperPropertyFileInputStream != null) {
69 mavenWrapperPropertyFileInputStream.close();
71 } catch (IOException e) {
76 System.out.println("- Downloading from: " + url);
78 File outputFile = new File(baseDirectory.getAbsolutePath(), MAVEN_WRAPPER_JAR_PATH);
79 if(!outputFile.getParentFile().exists()) {
80 if(!outputFile.getParentFile().mkdirs()) {
82 "- ERROR creating output directory '" + outputFile.getParentFile().getAbsolutePath() + "'");
85 System.out.println("- Downloading to: " + outputFile.getAbsolutePath());
87 downloadFileFromURL(url, outputFile);
88 System.out.println("Done");
90 } catch (Throwable e) {
91 System.out.println("- Error downloading");
97 private static void downloadFileFromURL(String urlString, File destination) throws Exception {
98 if (System.getenv("MVNW_USERNAME") != null && System.getenv("MVNW_PASSWORD") != null) {
99 String username = System.getenv("MVNW_USERNAME");
100 char[] password = System.getenv("MVNW_PASSWORD").toCharArray();
101 Authenticator.setDefault(new Authenticator() {
103 protected PasswordAuthentication getPasswordAuthentication() {
104 return new PasswordAuthentication(username, password);
108 URL website = new URL(urlString);
109 ReadableByteChannel rbc;
110 rbc = Channels.newChannel(website.openStream());
111 FileOutputStream fos = new FileOutputStream(destination);
112 fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);