Add a get_package_promotion Command (#1793)

* Add a get_package_promotion Command

* add changes to loadByTokenString

* Fix test

core/src/main/java/google/registry/tools/GetPackagePromotionCommand.java

@@ -0,0 +1,47 @@
+// Copyright 2022 The Nomulus Authors. All Rights Reserved.
+//
+// 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.
+
+package google.registry.tools;
+
+import static google.registry.persistence.transaction.TransactionManagerFactory.jpaTm;
+import static google.registry.util.PreconditionsUtils.checkArgumentPresent;
+
+import com.beust.jcommander.Parameter;
+import com.beust.jcommander.Parameters;
+import google.registry.model.domain.token.PackagePromotion;
+import java.util.List;
+
+/** Command to show a {@link PackagePromotion} object. */
+@Parameters(separators = " =", commandDescription = "Show package promotion object(s)")
+public class GetPackagePromotionCommand extends GetEppResourceCommand {
+
+  @Parameter(description = "Package token(s)", required = true)
+  private List<String> mainParameters;
+
+  @Override
+  void runAndPrint() {
+    for (String token : mainParameters) {
+      jpaTm()
+          .transact(
+              () -> {
+                PackagePromotion packagePromotion =
+                    checkArgumentPresent(
+                        PackagePromotion.loadByTokenString(token),
+                        "PackagePromotion with package token %s does not exist",
+                        token);
+                System.out.println(packagePromotion);
+              });
+    }
+  }
+}

core/src/main/java/google/registry/tools/RegistryTool.java

@@ -71,6 +71,7 @@ public final class RegistryTool {
           .put("get_history_entries", GetHistoryEntriesCommand.class)
           .put("get_host", GetHostCommand.class)
           .put("get_keyring_secret", GetKeyringSecretCommand.class)
+          .put("get_package_promotion", GetPackagePromotionCommand.class)
           .put("get_premium_list", GetPremiumListCommand.class)
           .put("get_registrar", GetRegistrarCommand.class)
           .put("get_reserved_list", GetReservedListCommand.class)