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Justine Tunney 2016-03-01 17:18:14 -05:00
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java/com/google/domain/registry/model/server/ServerSecret.java Normal file
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// Copyright 2016 Google Inc. 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 com.google.domain.registry.model.server;
import static com.google.domain.registry.model.ofy.ObjectifyService.ofy;
import com.google.domain.registry.model.annotations.NotBackedUp;
import com.google.domain.registry.model.annotations.NotBackedUp.Reason;
import com.google.domain.registry.model.common.CrossTldSingleton;
import com.googlecode.objectify.VoidWork;
import com.googlecode.objectify.annotation.Cache;
import com.googlecode.objectify.annotation.Entity;
import com.googlecode.objectify.annotation.Unindex;
import java.util.UUID;
/** A secret number used for generating tokens (such as XSRF tokens). */
@Entity
@Cache
@Unindex
@NotBackedUp(reason = Reason.AUTO_GENERATED)
public class ServerSecret extends CrossTldSingleton {
private static ServerSecret secret;
long mostSignificant;
long leastSignificant;
/**
* Get the server secret, creating it if the datastore doesn't have one already.
* <p>
* There's a tiny risk of a race here if two calls to this happen simultaneously and create
* different keys, in which case one of the calls will end up with an incorrect key. However, this
* happens precisely once in the history of the system (after that it's always in datastore) so
* it's not worth worrying about.
*/
public static UUID getServerSecret() {
if (secret == null) {
secret = ofy().load().entity(new ServerSecret()).now();
}
if (secret == null) {
secret = new ServerSecret();
UUID uuid = UUID.randomUUID();
secret.mostSignificant = uuid.getMostSignificantBits();
secret.leastSignificant = uuid.getLeastSignificantBits();
ofy().transact(new VoidWork(){
@Override
public void vrun() {
ofy().saveWithoutBackup().entity(secret);
}});
}
return new UUID(secret.mostSignificant, secret.leastSignificant);
}
}