Validate potentially-invalid domain names when (un)locking domains (#698)

* Validate potentially-invalid domain names when (un)locking domains

core/src/test/java/google/registry/ui/server/registrar/RegistryLockPostActionTest.java

@@ -280,6 +280,16 @@ public final class RegistryLockPostActionTest {
     assertFailureWithMessage(response, "Missing key for domainName");
   }
 
+  @Test
+  public void testFailure_nonPunycodeDomainName() {
+    Map<String, ?> response = action.handleJsonRequest(ImmutableMap.of(
+        "isLock", true,
+        "registrarId", "TheRegistrar",
+        "domainName", "example.みんな",
+        "password", "hi"));
+    assertFailureWithMessage(response, "Domain names can only contain a-z, 0-9, '.' and '-'");
+  }
+
   @Test
   public void testFailure_noLockParam() {
     Map<String, ?> response =