Add registry_tool host_create command

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130953679

java/google/registry/tools/CreateHostCommand.java

@@ -0,0 +1,76 @@
+// Copyright 2016 The Domain Registry 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.util.CollectionUtils.nullToEmpty;
+
+import com.beust.jcommander.Parameter;
+import com.beust.jcommander.Parameters;
+import com.google.common.collect.ImmutableList;
+import com.google.common.net.InetAddresses;
+import com.google.template.soy.data.SoyMapData;
+import google.registry.tools.Command.GtechCommand;
+import google.registry.tools.soy.HostCreateSoyInfo;
+import java.net.Inet4Address;
+import java.net.Inet6Address;
+import java.net.InetAddress;
+import java.util.List;
+
+/** A command to create a new host via EPP. */
+@Parameters(separators = " =", commandDescription = "Create a new host via EPP.")
+final class CreateHostCommand extends MutatingEppToolCommand implements GtechCommand {
+
+  @Parameter(
+      names = {"-c", "--client"},
+      description = "Client identifier of the registrar to execute the command as.",
+      required = true)
+  String clientIdentifier;
+
+  @Parameter(
+      names = "--host",
+      description = "Host name.",
+      required = true)
+  private String hostName;
+
+  @Parameter(
+      names = {"-a", "--addresses"},
+      description = "List of addresses in IPv4 and/or IPv6 format.",
+      variableArity = true)
+  private List<String> addresses;
+
+  @Override
+  protected void initMutatingEppToolCommand() {
+    setSoyTemplate(HostCreateSoyInfo.getInstance(), HostCreateSoyInfo.HOSTCREATE);
+    ImmutableList.Builder<String> ipv4Addresses = new ImmutableList.Builder<>();
+    ImmutableList.Builder<String> ipv6Addresses = new ImmutableList.Builder<>();
+    for (String address : nullToEmpty(addresses)) {
+      InetAddress inetAddress = InetAddresses.forString(address);
+      if (inetAddress instanceof Inet4Address) {
+        ipv4Addresses.add(inetAddress.getHostAddress());
+      } else if (inetAddress instanceof Inet6Address) {
+        ipv6Addresses.add(inetAddress.getHostAddress());
+      } else {
+        throw new IllegalArgumentException(
+            String.format("IP address in unknown format: %s", address));
+      }
+    }
+    addSoyRecord(
+        clientIdentifier,
+        new SoyMapData(
+            "hostname", hostName,
+            "ipv4addresses", ipv4Addresses.build(),
+            "ipv6addresses", ipv6Addresses.build()));
+  }
+}