Allow top level tld creation in Sandbox

Add a flag to the CreateCdnsTld command to bypass the dns name format
check in Sandbox (limiting names to `*.test.`). With this flag, we
can create TLDs for RST testing in Sandbox.

Note that if the new flag is wrongly set for a disallowed name, the
request to the Cloud DNS API will fail. The format check in the command
just provides a user-friendly error message.

Author: weiminyu

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

@@ -47,6 +47,11 @@ final class CreateCdnsTld extends ConfirmingCommand {
   )
   String name;
 
+  @Parameter(
+      names = "--skip_sandbox_tld_check",
+      description = "In Sandbox, skip the dns_name format check.")
+  boolean skipSandboxTldCheck;
+
   @Inject
   @Config("projectId")
   String projectId;
@@ -61,10 +66,15 @@ final class CreateCdnsTld extends ConfirmingCommand {
   protected void init() {
     // Sandbox talks to production Cloud DNS.  As a result, we can't configure any domains with a
     // suffix that might be used by customers on the same nameserver set.  Limit the user to setting
-    // up *.test TLDs.
-    if (RegistryToolEnvironment.get() == RegistryToolEnvironment.SANDBOX
-        && !dnsName.endsWith(".test.")) {
-      throw new IllegalArgumentException("Sandbox TLDs must be of the form \"*.test.\"");
+    // up *.test TLDs unless the user declares that the name is approved.
+    //
+    // The name format check simply provides a user-friendly error message. If the user wrongly
+    // declares name approval, the request to the Cloud DNS API will still fail.
+    if (RegistryToolEnvironment.get() == RegistryToolEnvironment.SANDBOX) {
+      if (!skipSandboxTldCheck && !dnsName.endsWith(".test.")) {
+        throw new IllegalArgumentException(
+            "Sandbox TLDs must be approved or in the form \"*.test.\"");
+      }
     }
 
     managedZone =

core/src/test/java/google/registry/tools/CreateCdnsTldTest.java

@@ -76,11 +76,37 @@ void testNameDefault() throws Exception {
 
   @Test
   @MockitoSettings(strictness = Strictness.LENIENT)
-  void testSandboxTldRestrictions() {
+  void testSandboxTldRestrictions_Disallowed() {
     IllegalArgumentException thrown =
         assertThrows(
             IllegalArgumentException.class,
-            () -> runCommandInEnvironment(RegistryToolEnvironment.SANDBOX, "--dns_name=foobar."));
-    assertThat(thrown).hasMessageThat().contains("Sandbox TLDs must be of the form \"*.test.\"");
+            () ->
+                runCommandInEnvironment(
+                    RegistryToolEnvironment.SANDBOX,
+                    "--dns_name=foobar.",
+                    "--description=test run",
+                    "--force"));
+    assertThat(thrown)
+        .hasMessageThat()
+        .contains("Sandbox TLDs must be approved or in the form \"*.test.\"");
+  }
+
+  @Test
+  void testSandboxTldRestrictions_tldCheckSkipped() throws Exception {
+    runCommandInEnvironment(
+        RegistryToolEnvironment.SANDBOX,
+        "--dns_name=foobar.",
+        "--description=test run",
+        "--force",
+        "--skip_sandbox_tld_check");
+  }
+
+  @Test
+  void testSandboxTldRestrictions_testTld() throws Exception {
+    runCommandInEnvironment(
+        RegistryToolEnvironment.SANDBOX,
+        "--dns_name=abc.test.",
+        "--description=test run",
+        "--force");
   }
 }