Remove Contact and ContactHistory Java objects and related code

This doesn't remove everything -- there are still other contact-related
objects that we'll need to remove (e.g.
ContactPendingActionNotificationResponse) and simplifications we'll need to make
(e.g. only domains can be transferred now, so all transfer data can move
there instead of being generic)

But this removes the bulk of the remaining contact-related code. We'll
keep around the XML request objects, since it's still nice to route them
to the appropriate (exception-throwing but logging) flow class.

Author: gbrodman

core/src/main/java/google/registry/flows/domain/DomainFlowUtils.java

@@ -67,14 +67,11 @@
 import google.registry.flows.EppException.RequiredParameterMissingException;
 import google.registry.flows.EppException.StatusProhibitsOperationException;
 import google.registry.flows.EppException.UnimplementedOptionException;
-import google.registry.flows.exceptions.ContactsProhibitedException;
 import google.registry.flows.exceptions.ResourceHasClientUpdateProhibitedException;
 import google.registry.model.EppResource;
 import google.registry.model.billing.BillingBase.Flag;
 import google.registry.model.billing.BillingBase.Reason;
 import google.registry.model.billing.BillingRecurrence;
-import google.registry.model.contact.Contact;
-import google.registry.model.domain.DesignatedContact;
 import google.registry.model.domain.Domain;
 import google.registry.model.domain.DomainCommand.Create;
 import google.registry.model.domain.DomainCommand.CreateOrUpdate;
@@ -421,33 +418,6 @@ static void validateNameserversCountForTld(String tld, InternetDomainName domain
     }
   }
 
-  /** Enforces absence of contact data on creation as part of the Minimum Dataset requirements. */
-  static void enforceContactAbsencesOnCreate(Create create)
-      throws ParameterValuePolicyErrorException {
-    enforceContactAbsences(create.getRegistrant(), create.getContacts());
-  }
-
-  /** Enforces absence of contact data on update as part of the Minimum Dataset requirements. */
-  static void enforceContactAbsencesOnUpdate(Update update)
-      throws ParameterValuePolicyErrorException {
-    Set<DesignatedContact> allDesignatedContacts =
-        Sets.union(update.getInnerAdd().getContacts(), update.getInnerRemove().getContacts());
-    enforceContactAbsences(update.getInnerChange().getRegistrant(), allDesignatedContacts);
-  }
-
-  /** Enforces the absence of contact data as part of the Minimum Dataset requirements. */
-  static void enforceContactAbsences(
-      Optional<VKey<Contact>> registrant, Set<DesignatedContact> contacts)
-      throws ParameterValuePolicyErrorException {
-    if (registrant.isPresent()) {
-      throw new RegistrantProhibitedException();
-    }
-    if (!contacts.isEmpty()) {
-      throw new ContactsProhibitedException();
-    }
-  }
-
-
   static void validateNameserversAllowedOnTld(String tld, Set<String> fullyQualifiedHostNames)
       throws EppException {
     ImmutableSet<String> allowedHostNames = Tld.get(tld).getAllowedFullyQualifiedHostNames();
@@ -971,7 +941,6 @@ static void validateCreateCommandContactsAndNameservers(
       Create command, Tld tld, InternetDomainName domainName) throws EppException {
     verifyNotInPendingDelete(command.getNameservers());
     String tldStr = tld.getTldStr();
-    enforceContactAbsencesOnCreate(command);
     ImmutableSet<String> hostNames = command.getNameserverHostNames();
     validateNameserversCountForTld(tldStr, domainName, hostNames.size());
     validateNameserversAllowedOnTld(tldStr, hostNames);

core/src/main/java/google/registry/flows/domain/DomainUpdateFlow.java

@@ -29,7 +29,6 @@
 import static google.registry.flows.ResourceFlowUtils.verifyResourceOwnership;
 import static google.registry.flows.domain.DomainFlowUtils.checkAllowedAccessToTld;
 import static google.registry.flows.domain.DomainFlowUtils.cloneAndLinkReferences;
-import static google.registry.flows.domain.DomainFlowUtils.enforceContactAbsencesOnUpdate;
 import static google.registry.flows.domain.DomainFlowUtils.updateDsData;
 import static google.registry.flows.domain.DomainFlowUtils.validateDsData;
 import static google.registry.flows.domain.DomainFlowUtils.validateFeesAckedIfPresent;
@@ -249,8 +248,6 @@ private Domain performUpdate(Update command, Domain domain, DateTime now) throws
           ext.getRemove().map(Remove::getDsData).orElse(ImmutableSet.of()));
     }
     Change change = command.getInnerChange();
-    enforceContactAbsencesOnUpdate(command);
-
     Domain.Builder domainBuilder =
         domain
             .asBuilder()

core/src/main/java/google/registry/model/ForeignKeyUtils.java

@@ -29,7 +29,6 @@
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Maps;
 import google.registry.config.RegistryConfig;
-import google.registry.model.contact.Contact;
 import google.registry.model.domain.Domain;
 import google.registry.model.host.Host;
 import google.registry.persistence.VKey;
@@ -60,7 +59,6 @@ private ForeignKeyUtils() {}
   private static final ImmutableMap<Class<? extends EppResource>, String>
       RESOURCE_TYPE_TO_FK_PROPERTY =
           ImmutableMap.of(
-              Contact.class, "contactId",
               Domain.class, "domainName",
               Host.class, "hostName");