feat (jkube-kit/common) : Add CLIDownloaderUtil to download cli binar…

…ies (eclipse-jkube#2454)

Add CLIDownloaderUtil to download CLI binaries from remote sources.

Signed-off-by: Rohan Kumar <[email protected]>

jkube-kit/common/src/main/java/org/eclipse/jkube/kit/common/util/CliDownloaderUtil.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2019 Red Hat, Inc.
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at:
+ *
+ *     https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *   Red Hat, Inc. - initial API and implementation
+ */
+package org.eclipse.jkube.kit.common.util;
+
+import io.fabric8.kubernetes.client.Config;
+import io.fabric8.kubernetes.client.http.HttpClient;
+import io.fabric8.kubernetes.client.http.HttpResponse;
+import io.fabric8.kubernetes.client.utils.HttpClientUtils;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+
+import static org.apache.commons.io.FilenameUtils.removeExtension;
+import static org.eclipse.jkube.kit.common.archive.ArchiveDecompressor.extractArchive;
+
+public class CliDownloaderUtil {
+  private CliDownloaderUtil() { }
+
+  public static String downloadCli(String baseDownloadUrl, String cliBinaryPrefix, String cliArtifactName, File outputDirectory) throws IOException {
+    URL downloadUrl = new URL(String.format("%s/%s", baseDownloadUrl, cliArtifactName));
+    File targetExtractionDir = outputDirectory.toPath().resolve(removeExtension(cliArtifactName)).toFile();
+
+    downloadAndExtractTo(downloadUrl, targetExtractionDir);
+
+    return getCliBinaryPathFromExtractedDir(targetExtractionDir, cliBinaryPrefix);
+  }
+
+  private static void downloadAndExtractTo(URL downloadUrl, File target) throws IOException {
+    try (HttpClient client = HttpClientUtils.getHttpClientFactory().newBuilder(Config.empty()).build()) {
+      final HttpResponse<InputStream> response = client.sendAsync(
+              client.newHttpRequestBuilder().timeout(30, TimeUnit.MINUTES).url(downloadUrl).build(), InputStream.class)
+          .get();
+      if (!response.isSuccessful()) {
+        throw new IOException("Server returned (" + response.code() + ") while downloading " + downloadUrl);
+      }
+      try (InputStream is = response.body()) {
+        extractArchive(is, target);
+      }
+    } catch(InterruptedException ex) {
+      Thread.currentThread().interrupt();
+      throw new IOException("Download interrupted", ex);
+    } catch (IOException | ExecutionException e) {
+      throw new IOException("Failed to download URL " + downloadUrl + " to  " + target + ": " + e, e);
+    }
+  }
+
+  private static String getCliBinaryPathFromExtractedDir(File targetExtractionDir, String binaryPrefix) {
+    String cliPath = null;
+    File[] cliArtifactList = targetExtractionDir.listFiles(f -> f.getName().startsWith(binaryPrefix));
+    if (cliArtifactList != null && cliArtifactList.length >= 1) {
+      cliPath = cliArtifactList[0].getAbsolutePath();
+    }
+    return cliPath;
+  }
+}

jkube-kit/common/src/test/java/org/eclipse/jkube/kit/common/util/CliDownloaderUtilTest.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2019 Red Hat, Inc.
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at:
+ *
+ *     https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *   Red Hat, Inc. - initial API and implementation
+ */
+package org.eclipse.jkube.kit.common.util;
+
+import org.eclipse.jkube.kit.common.TestHttpStaticServer;
+import org.eclipse.jkube.kit.common.assertj.FileAssertions;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import java.io.File;
+import java.io.IOException;
+
+import static org.assertj.core.api.Assertions.assertThatIOException;
+import static org.assertj.core.api.AssertionsForInterfaceTypes.assertThat;
+
+class CliDownloaderUtilTest {
+  @TempDir
+  private File temporaryFolder;
+
+  @Test
+  void downloadCLI_whenUnixArtifactProvided_thenDownloadAndExtract() throws IOException {
+    File remoteDirectory = new File(getClass().getResource("/downloadable-artifacts").getFile());
+    try (TestHttpStaticServer http = new TestHttpStaticServer(remoteDirectory)) {
+      // Given
+      String baseUrl = String.format("http://localhost:%d", http.getPort());
+
+      // When
+      String downloadPath = CliDownloaderUtil.downloadCli(baseUrl, "foo", "foo-v0.0.1-linux.tgz", temporaryFolder);
+
+      // Then
+      assertThat(downloadPath).contains("foo-v0.0.1-linux", "foo");
+      FileAssertions.assertThat(temporaryFolder)
+          .exists()
+          .fileTree()
+          .containsExactlyInAnyOrder("foo-v0.0.1-linux", "foo-v0.0.1-linux/foo");
+    }
+  }
+
+  @Test
+  void downloadCLI_whenZipArtifactProvided_thenDownloadAndExtract() throws IOException {
+    File remoteDirectory = new File(getClass().getResource("/downloadable-artifacts").getFile());
+    try (TestHttpStaticServer http = new TestHttpStaticServer(remoteDirectory)) {
+      // Given
+      String baseUrl = String.format("http://localhost:%d", http.getPort());
+
+      // When
+      String downloadPath = CliDownloaderUtil.downloadCli(baseUrl, "foo", "foo-v0.0.1-windows.zip", temporaryFolder);
+
+      // Then
+      assertThat(downloadPath).contains("foo-v0.0.1-windows", "foo.exe");
+      FileAssertions.assertThat(temporaryFolder)
+          .exists()
+          .fileTree()
+          .containsExactlyInAnyOrder("foo-v0.0.1-windows", "foo-v0.0.1-windows/foo.exe");
+    }
+  }
+
+  @Test
+  void downloadCLI_whenArtifactNotAvailable_thenThrowException() throws IOException {
+    File remoteDirectory = new File(getClass().getResource("/downloadable-artifacts").getFile());
+    try (TestHttpStaticServer http = new TestHttpStaticServer(remoteDirectory)) {
+      // Given
+      String baseUrl = String.format("http://localhost:%d", http.getPort());
+
+      // When + Then
+      assertThatIOException()
+          .isThrownBy(() -> CliDownloaderUtil.downloadCli(baseUrl, "idontexist", "idontexist-v0.0.1-linux.tgz", temporaryFolder))
+          .withMessageContaining("Failed to download");
+    }
+  }
+}