personalweb

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MavenWrapperDownloader.java (4942B)

      1 /*
      2  * Copyright 2007-present the original author or authors.
      3  *
      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
      7  *
      8  *      https://www.apache.org/licenses/LICENSE-2.0
      9  *
     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.
     15  */
     16 import java.net.*;
     17 import java.io.*;
     18 import java.nio.channels.*;
     19 import java.util.Properties;
     20 
     21 public class MavenWrapperDownloader {
     22 
     23     private static final String WRAPPER_VERSION = "0.5.6";
     24     /**
     25      * Default URL to download the maven-wrapper.jar from, if no 'downloadUrl' is provided.
     26      */
     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";
     29 
     30     /**
     31      * Path to the maven-wrapper.properties file, which might contain a downloadUrl property to
     32      * use instead of the default one.
     33      */
     34     private static final String MAVEN_WRAPPER_PROPERTIES_PATH =
     35             ".mvn/wrapper/maven-wrapper.properties";
     36 
     37     /**
     38      * Path where the maven-wrapper.jar will be saved to.
     39      */
     40     private static final String MAVEN_WRAPPER_JAR_PATH =
     41             ".mvn/wrapper/maven-wrapper.jar";
     42 
     43     /**
     44      * Name of the property which should be used to override the default download url for the wrapper.
     45      */
     46     private static final String PROPERTY_NAME_WRAPPER_URL = "wrapperUrl";
     47 
     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());
     52 
     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;
     59             try {
     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 + "'");
     66             } finally {
     67                 try {
     68                     if(mavenWrapperPropertyFileInputStream != null) {
     69                         mavenWrapperPropertyFileInputStream.close();
     70                     }
     71                 } catch (IOException e) {
     72                     // Ignore ...
     73                 }
     74             }
     75         }
     76         System.out.println("- Downloading from: " + url);
     77 
     78         File outputFile = new File(baseDirectory.getAbsolutePath(), MAVEN_WRAPPER_JAR_PATH);
     79         if(!outputFile.getParentFile().exists()) {
     80             if(!outputFile.getParentFile().mkdirs()) {
     81                 System.out.println(
     82                         "- ERROR creating output directory '" + outputFile.getParentFile().getAbsolutePath() + "'");
     83             }
     84         }
     85         System.out.println("- Downloading to: " + outputFile.getAbsolutePath());
     86         try {
     87             downloadFileFromURL(url, outputFile);
     88             System.out.println("Done");
     89             System.exit(0);
     90         } catch (Throwable e) {
     91             System.out.println("- Error downloading");
     92             e.printStackTrace();
     93             System.exit(1);
     94         }
     95     }
     96 
     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() {
    102                 @Override
    103                 protected PasswordAuthentication getPasswordAuthentication() {
    104                     return new PasswordAuthentication(username, password);
    105                 }
    106             });
    107         }
    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);
    113         fos.close();
    114         rbc.close();
    115     }
    116 
    117 }