#1657: snapshot version number retrieval optimizations

cobigen/core-artifact-retriever/src/main/java/com/devonfw/cobigen/retriever/mavensearch/constants/MavenSearchRepositoryConstants.java

@@ -83,7 +83,7 @@ public class MavenSearchRepositoryConstants {
   /**
    * Nexus2 SNAPSHOT repository link
    */
-  public static final String NEXUS2_SNAPSHOT_REPOSITORY_LINK = "service/local/artifact/maven/redirect";
+  public static final String NEXUS2_SNAPSHOT_REPOSITORY_LINK = "service/local/repositories/snapshots/content";
 
   /**
    * Nexus2 REST search API path

cobigen/core-artifact-retriever/src/main/java/com/devonfw/cobigen/retriever/mavensearch/to/model/AbstractSearchResponse.java

@@ -138,7 +138,8 @@ public static String retrieveJsonResponseWithAuthentication(String targetLink,
     builder.writeTimeout(WRITE_TIMEOUT, TimeUnit.SECONDS);
     builder.retryOnConnectionFailure(true);
 
-    if (serverCredentials.getProxyAddress() != null && serverCredentials.getProxyPort() != 0) {
+    if (serverCredentials != null && serverCredentials.getProxyAddress() != null
+        && serverCredentials.getProxyPort() != 0) {
       buildProxy(serverCredentials, builder);
     }
 
@@ -156,7 +157,8 @@ public static String retrieveJsonResponseWithAuthentication(String targetLink,
 
       boolean usingBasicAuth = false;
       // use basic authentication
-      if (serverCredentials.getUsername() != null && serverCredentials.getPassword() != null) {
+      if (serverCredentials != null && serverCredentials.getUsername() != null
+          && serverCredentials.getPassword() != null) {
         LOG.debug("Connecting to REST API using Basic Authentication.");
         requestWithHeaders = basicUsernamePasswordAuthentication(targetLink, serverCredentials.getUsername(),
             serverCredentials.getPassword(), requestWithHeaders);
@@ -239,22 +241,33 @@ public Request authenticate(Route route, Response response) throws IOException {
   }
 
   /**
-   * Creates a download link (concatenates maven repository link with groupId, artifact and version)
+   * Creates a download link (concatenates maven repository link with groupId, artifact and version).
+   *
+   * Can handle snapshot versions if provided
    *
    * @param mavenRepo link to the maven repository to use
    * @param groupId for the download link
    * @param artifactId for the download link
    * @param version for the download link
    * @param fileEnding file ending for the download link
+   * @param snapshotVersion String of snapshot version number
    * @return concatenated download link
    * @throws MalformedURLException if the URL was not valid
    */
   protected static URL createDownloadLink(String mavenRepo, String groupId, String artifactId, String version,
-      String fileEnding) throws MalformedURLException {
+      String fileEnding, String snapshotVersion) throws MalformedURLException {
 
     String parsedGroupId = groupId.replace(".", "/");
     String downloadFile = artifactId + "-" + version + fileEnding;
+
+    // replace version with snapshot version
+    if (!snapshotVersion.isEmpty()) {
+      String versionWithoutSnapShot = version.replace("-SNAPSHOT", "");
+      downloadFile = artifactId + "-" + versionWithoutSnapShot + "-" + snapshotVersion + fileEnding;
+    }
+
     String downloadLink = mavenRepo + "/" + parsedGroupId + "/" + artifactId + "/" + version + "/" + downloadFile;
+
     URL url = new URL(downloadLink);
     return url;
   }

cobigen/core-artifact-retriever/src/main/java/com/devonfw/cobigen/retriever/mavensearch/to/model/maven/MavenSearchResponse.java

@@ -68,7 +68,7 @@ public List<URL> retrieveTemplateSetXmlDownloadURLs() throws MalformedURLExcepti
         if (fileEnding.endsWith(ConfigurationConstants.TEMPLATE_SET_CONFIG_FILENAME)) {
           downloadLinks.add(
               AbstractSearchResponse.createDownloadLink(MavenSearchRepositoryConstants.MAVEN_REPOSITORY_DOWNLOAD_LINK,
-                  doc.getGroup(), doc.getArtifact(), doc.getLatestVersion(), fileEnding));
+                  doc.getGroup(), doc.getArtifact(), doc.getLatestVersion(), fileEnding, ""));
         }
 
       }

cobigen/core-artifact-retriever/src/main/java/com/devonfw/cobigen/retriever/mavensearch/to/model/nexus2/Nexus2SearchResponse.java

@@ -4,6 +4,8 @@
 import java.net.URL;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -49,17 +51,23 @@ public List<URL> retrieveTemplateSetXmlDownloadURLs() throws MalformedURLExcepti
           if (artifactLink.getClassifier() != null && artifactLink.getClassifier().equals("template-set")) {
             // Check for full SNAPSHOT version link
             if (item.getVersion().contains("-SNAPSHOT")) {
-              URL snapShotUrl = new URL(MavenSearchRepositoryConstants.NEXUS2_REPOSITORY_URL + "/"
-                  + MavenSearchRepositoryConstants.NEXUS2_SNAPSHOT_REPOSITORY_LINK + "?r=snapshots" + "&g="
-                  + item.getGroupId() + "&a=" + item.getArtifactId() + "&v=" + item.getVersion() + "&e="
-                  + artifactLink.getExtension() + "&c=" + artifactLink.getClassifier());
-              downloadLinks.add(snapShotUrl);
+
+              String fullSnapshotVersion = determineSnapshotVersionFromResource(item.getGroupId(), item.getArtifactId(),
+                  item.getVersion());
+
+              URL snapshotUrl = AbstractSearchResponse.createDownloadLink(
+                  MavenSearchRepositoryConstants.NEXUS2_REPOSITORY_URL + "/"
+                      + MavenSearchRepositoryConstants.NEXUS2_SNAPSHOT_REPOSITORY_LINK,
+                  item.getGroupId(), item.getArtifactId(), item.getVersion(),
+                  "-" + artifactLink.getClassifier() + "." + artifactLink.getExtension(), fullSnapshotVersion);
+
+              downloadLinks.add(snapshotUrl);
             } else {
               downloadLinks.add(AbstractSearchResponse.createDownloadLink(
                   MavenSearchRepositoryConstants.NEXUS2_REPOSITORY_URL + "/"
                       + MavenSearchRepositoryConstants.NEXUS2_REPOSITORY_LINK,
                   item.getGroupId(), item.getArtifactId(), item.getVersion(),
-                  "-" + artifactLink.getClassifier() + "." + artifactLink.getExtension()));
+                  "-" + artifactLink.getClassifier() + "." + artifactLink.getExtension(), ""));
             }
           }
         }
@@ -69,6 +77,32 @@ public List<URL> retrieveTemplateSetXmlDownloadURLs() throws MalformedURLExcepti
     return removeDuplicatedDownloadURLs(downloadLinks);
   }
 
+  /**
+   * Determines the full snapshot version number from resource xml
+   *
+   * @param groupId String of the group ID
+   * @param artifactId String of the artifact ID
+   * @param version String of the version
+   * @return String of full snapshot version number
+   */
+  @JsonIgnore
+  public String determineSnapshotVersionFromResource(String groupId, String artifactId, String version) {
+
+    String parsedGroupId = groupId.replace(".", "/");
+    String snapshotUrl = MavenSearchRepositoryConstants.NEXUS2_REPOSITORY_URL + "/"
+        + MavenSearchRepositoryConstants.NEXUS2_SNAPSHOT_REPOSITORY_LINK + "/" + parsedGroupId + "/" + artifactId + "/"
+        + version;
+    String response = AbstractSearchResponse.retrieveJsonResponseWithAuthentication(snapshotUrl, getRepositoryType(),
+        null);
+    Pattern pattern = Pattern.compile("(\\d+\\.)?(\\d+\\.)?(\\*|\\d+)-(\\d+)-template-set\\.xml");
+    Matcher matcher = pattern.matcher(response);
+    String versionNumber = "";
+    if (matcher.find()) {
+      versionNumber = matcher.group();
+    }
+    return versionNumber.replace("-template-set.xml", "");
+  }
+
   @Override
   @JsonIgnore
   public String retrieveJsonResponse(ServerCredentials serverCredentials, String groupId)