#1218: optimized gradle url-updater

url-updater/src/main/java/com/devonfw/tools/ide/url/updater/gradle/GradleUrlUpdater.java

@@ -1,5 +1,7 @@
 package com.devonfw.tools.ide.url.updater.gradle;
 
+import java.util.HashSet;
+import java.util.Set;
 import java.util.regex.Pattern;
 
 import com.devonfw.tools.ide.url.model.folder.UrlVersion;
@@ -9,16 +11,31 @@
  * {@link WebsiteUrlUpdater} for Gradle.
  */
 public class GradleUrlUpdater extends WebsiteUrlUpdater {
+
+  private final static String VERSION_PATTERN = "release-checksums#v(\\d\\.\\d[\\.\\d]*)\"";
+
+  private final static String HASHSUM_GRAB_PATTERN = "((.*)\\s){5}";
+
+  private final static String SHA256_PATTERN = "[a-fA-F0-9]{64}";
+
+  private final static String VERSION_URL = "https://gradle.org/releases";
+
+  private final static String HASH_VERSION_URL = "https://gradle.org/release-checksums";
+
+  private final static String DOWNLOAD_URL = "https://services.gradle.org/distributions/gradle-${version}-bin.zip";
+
+  private String responseBody;
+
   @Override
   protected String getVersionUrl() {
 
-    return "https://gradle.org/releases/";
+    return VERSION_URL;
   }
 
   @Override
   protected Pattern getVersionPattern() {
 
-    return Pattern.compile("(\\d\\.\\d[\\.\\d]*)");
+    return Pattern.compile(VERSION_PATTERN);
   }
 
   @Override
@@ -30,8 +47,57 @@ protected String getTool() {
   @Override
   protected void addVersion(UrlVersion urlVersion) {
 
-    doAddVersion(urlVersion, "https://services.gradle.org/distributions/gradle-${version}-bin.zip");
+    if (responseBody == null) {
+      responseBody = doGetResponseBodyAsString(HASH_VERSION_URL);
+    }
+
+    String hashSum = "";
+    if (responseBody != null && !responseBody.isEmpty()) {
+      hashSum = doGetHashSumForVersion(responseBody, urlVersion.getName());
+    }
+
+    if (hashSum.isEmpty()) {
+      doAddVersion(urlVersion, DOWNLOAD_URL);
+    } else {
+      doAddVersion(urlVersion, DOWNLOAD_URL, null, null, hashSum);
+    }
+
+  }
+
+  /**
+   * Gets a hashSum from the release-checksum page for the provided version
+   *
+   * @param htmlBody the body of the hashSum HTML page
+   * @param version the version
+   * @return the checksum
+   */
+  protected String doGetHashSumForVersion(String htmlBody, String version) {
+
+    String regexVersion = version.replace(".", "\\.");
+    Pattern hashVersionPattern = Pattern.compile("v" + regexVersion + HASHSUM_GRAB_PATTERN);
+    var matcher = hashVersionPattern.matcher(htmlBody);
+    if (matcher.find()) {
+      String versionMatch = matcher.group();
+      Pattern hashPattern = Pattern.compile(SHA256_PATTERN);
+      var hashMatcher = hashPattern.matcher(versionMatch);
+      if (hashMatcher.find()) {
+        return hashMatcher.group();
+      }
+    }
+    return "";
+  }
+
+  @Override
+  protected Set<String> doGetRegexMatchesAsList(String htmlBody) {
 
+    Set<String> versions = new HashSet<>();
+    var matcher = getVersionPattern().matcher(htmlBody);
+    while (matcher.find()) {
+      String version = matcher.group();
+      String newVersion = version.replace("release-checksums#v", "").replace("\"", "");
+      addVersion(newVersion, versions);
+    }
+    return versions;
   }
 
 }