Add missing .mvn wrapper

.mvn/wrapper/MavenWrapperDownloader.java

@@ -0,0 +1,118 @@
+/*
+ * Copyright 2007-present the original author or authors.
+ *
+ * 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.
+ */
+import java.io.*;
+import java.net.*;
+import java.nio.channels.*;
+import java.util.Properties;
+
+public class MavenWrapperDownloader {
+
+  private static final String WRAPPER_VERSION = "0.5.6";
+  /** Default URL to download the maven-wrapper.jar from, if no 'downloadUrl' is provided. */
+  private static final String DEFAULT_DOWNLOAD_URL =
+      "https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/"
+          + WRAPPER_VERSION
+          + "/maven-wrapper-"
+          + WRAPPER_VERSION
+          + ".jar";
+
+  /**
+   * Path to the maven-wrapper.properties file, which might contain a downloadUrl property to use
+   * instead of the default one.
+   */
+  private static final String MAVEN_WRAPPER_PROPERTIES_PATH =
+      ".mvn/wrapper/maven-wrapper.properties";
+
+  /** Path where the maven-wrapper.jar will be saved to. */
+  private static final String MAVEN_WRAPPER_JAR_PATH = ".mvn/wrapper/maven-wrapper.jar";
+
+  /**
+   * Name of the property which should be used to override the default download url for the wrapper.
+   */
+  private static final String PROPERTY_NAME_WRAPPER_URL = "wrapperUrl";
+
+  public static void main(String args[]) {
+    System.out.println("- Downloader started");
+    File baseDirectory = new File(args[0]);
+    System.out.println("- Using base directory: " + baseDirectory.getAbsolutePath());
+
+    // If the maven-wrapper.properties exists, read it and check if it contains a custom
+    // wrapperUrl parameter.
+    File mavenWrapperPropertyFile = new File(baseDirectory, MAVEN_WRAPPER_PROPERTIES_PATH);
+    String url = DEFAULT_DOWNLOAD_URL;
+    if (mavenWrapperPropertyFile.exists()) {
+      FileInputStream mavenWrapperPropertyFileInputStream = null;
+      try {
+        mavenWrapperPropertyFileInputStream = new FileInputStream(mavenWrapperPropertyFile);
+        Properties mavenWrapperProperties = new Properties();
+        mavenWrapperProperties.load(mavenWrapperPropertyFileInputStream);
+        url = mavenWrapperProperties.getProperty(PROPERTY_NAME_WRAPPER_URL, url);
+      } catch (IOException e) {
+        System.out.println("- ERROR loading '" + MAVEN_WRAPPER_PROPERTIES_PATH + "'");
+      } finally {
+        try {
+          if (mavenWrapperPropertyFileInputStream != null) {
+            mavenWrapperPropertyFileInputStream.close();
+          }
+        } catch (IOException e) {
+          // Ignore ...
+        }
+      }
+    }
+    System.out.println("- Downloading from: " + url);
+
+    File outputFile = new File(baseDirectory.getAbsolutePath(), MAVEN_WRAPPER_JAR_PATH);
+    if (!outputFile.getParentFile().exists()) {
+      if (!outputFile.getParentFile().mkdirs()) {
+        System.out.println(
+            "- ERROR creating output directory '"
+                + outputFile.getParentFile().getAbsolutePath()
+                + "'");
+      }
+    }
+    System.out.println("- Downloading to: " + outputFile.getAbsolutePath());
+    try {
+      downloadFileFromURL(url, outputFile);
+      System.out.println("Done");
+      System.exit(0);
+    } catch (Throwable e) {
+      System.out.println("- Error downloading");
+      e.printStackTrace();
+      System.exit(1);
+    }
+  }
+
+  private static void downloadFileFromURL(String urlString, File destination) throws Exception {
+    if (System.getenv("MVNW_USERNAME") != null && System.getenv("MVNW_PASSWORD") != null) {
+      String username = System.getenv("MVNW_USERNAME");
+      char[] password = System.getenv("MVNW_PASSWORD").toCharArray();
+      Authenticator.setDefault(
+          new Authenticator() {
+            @Override
+            protected PasswordAuthentication getPasswordAuthentication() {
+              return new PasswordAuthentication(username, password);
+            }
+          });
+    }
+    URL website = new URL(urlString);
+    ReadableByteChannel rbc;
+    rbc = Channels.newChannel(website.openStream());
+    FileOutputStream fos = new FileOutputStream(destination);
+    fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
+    fos.close();
+    rbc.close();
+  }
+}

.mvn/wrapper/maven-wrapper.properties

@@ -0,0 +1,2 @@
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.6.3/apache-maven-3.6.3-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar