feat(auth): add apikeys undelete api key sample. (#9619)

* Implemented apikeys_undelete_api_key sample, created test

* Fixed header

auth/src/main/java/UndeleteApiKey.java

@@ -0,0 +1,59 @@
+/*
+ * Copyright 2024 Google LLC
+ *
+ * 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.
+ */
+
+// [START apikeys_undelete_api_key]
+import com.google.api.apikeys.v2.ApiKeysClient;
+import com.google.api.apikeys.v2.Key;
+import com.google.api.apikeys.v2.UndeleteKeyRequest;
+import java.io.IOException;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+public class UndeleteApiKey {
+
+  public static void main(String[] args)
+      throws IOException, ExecutionException, InterruptedException, TimeoutException {
+    // TODO(developer): Replace these variables before running the sample.
+    // Project ID or project number of the Google Cloud project.
+    String projectId = "YOUR_PROJECT_ID";
+    // The API key id to undelete.
+    String keyId = "YOUR_KEY_ID";
+
+    undeleteApiKey(projectId, keyId);
+  }
+
+  // Undeletes an API key.
+  public static void undeleteApiKey(String projectId, String keyId)
+      throws IOException, ExecutionException, InterruptedException, TimeoutException {
+    // Initialize client that will be used to send requests. This client only needs to be created
+    // once, and can be reused for multiple requests.
+    try (ApiKeysClient apiKeysClient = ApiKeysClient.create()) {
+
+      // Initialize the undelete request and set the argument.
+      UndeleteKeyRequest undeleteKeyRequest = UndeleteKeyRequest.newBuilder()
+          .setName(String.format("projects/%s/locations/global/keys/%s", projectId, keyId))
+          .build();
+
+      // Make the request and wait for the operation to complete.
+      Key undeletedKey = apiKeysClient.undeleteKeyAsync(undeleteKeyRequest)
+          .get(3, TimeUnit.MINUTES);
+
+      System.out.printf("Successfully undeleted the API key: %s", undeletedKey.getName());
+    }
+  }
+}
+// [END apikeys_undelete_api_key]

auth/src/test/java/ApiKeySnippetsIT.java

@@ -36,7 +36,6 @@
 public class ApiKeySnippetsIT {
 
   private static final String PROJECT_ID = System.getenv("GOOGLE_CLOUD_PROJECT");
-  private static final String CREDENTIALS = System.getenv("GOOGLE_APPLICATION_CREDENTIALS");
   private static Key API_KEY;
   private static String API_KEY_STRING;
   private ByteArrayOutputStream stdOut;
@@ -79,8 +78,15 @@ public static void cleanup()
 
     String apiKeyId = getApiKeyId(API_KEY);
     DeleteApiKey.deleteApiKey(PROJECT_ID, apiKeyId);
-    String goal = String.format("Successfully deleted the API key: %s", API_KEY.getName());
-    assertThat(stdOut.toString()).contains(goal);
+
+    UndeleteApiKey.undeleteApiKey(PROJECT_ID, apiKeyId);
+    String undeletedKey = String.format("Successfully undeleted the API key: %s",
+        API_KEY.getName());
+    assertThat(stdOut.toString()).contains(undeletedKey);
+
+    DeleteApiKey.deleteApiKey(PROJECT_ID, apiKeyId);
+    String deletedKey = String.format("Successfully deleted the API key: %s", API_KEY.getName());
+    assertThat(stdOut.toString()).contains(deletedKey);
 
     stdOut.close();
     System.setOut(out);