Add metadata map to LrpToken

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=135382828

java/google/registry/model/domain/LrpToken.java

@@ -18,13 +18,15 @@ import static google.registry.util.CollectionUtils.nullToEmptyImmutableCopy;
 import static google.registry.util.PreconditionsUtils.checkArgumentNotNull;
 
 import com.googlecode.objectify.Key;
+import com.googlecode.objectify.annotation.EmbedMap;
 import com.googlecode.objectify.annotation.Entity;
 import com.googlecode.objectify.annotation.Id;
 import com.googlecode.objectify.annotation.Index;
 import google.registry.model.BackupGroupRoot;
 import google.registry.model.Buildable;
 import google.registry.model.reporting.HistoryEntry;
-import google.registry.model.reporting.HistoryEntry.Type;
+
+import java.util.Map;
 import java.util.Set;
 
 /**
@@ -52,11 +54,18 @@ public class LrpToken extends BackupGroupRoot implements Buildable {
   Set<String> validTlds;
 
   /**
-   * The key of the history entry for which the token was used. Given LRP is a domain application
+   * The key of the history entry for which the token was used.
-   * phase, this should always be a {@link Type#DOMAIN_APPLICATION_CREATE}.
    */
   Key<HistoryEntry> redemptionHistoryEntry;
 
+  /**
+   * A set of key-value properties associated with the LRP token. This map can be used to store
+   * additional metadata about the assignee or space of domain names for which this token can be
+   * valid.
+   */
+  @EmbedMap
+  Map<String, String> metadata;
+
   public String getToken() {
     return token;
   }
@@ -77,6 +86,10 @@ public class LrpToken extends BackupGroupRoot implements Buildable {
     return nullToEmptyImmutableCopy(validTlds);
   }
 
+  public Map<String, String> getMetadata() {
+    return nullToEmptyImmutableCopy(metadata);
+  }
+  
   @Override
   public Builder asBuilder() {
     return new Builder(clone(this));
@@ -109,5 +122,10 @@ public class LrpToken extends BackupGroupRoot implements Buildable {
       getInstance().validTlds = validTlds;
       return this;
     }
+
+    public Builder setMetadata(Map<String, String> metadata) {
+      getInstance().metadata = metadata;
+      return this;
+    }
   }
 }

javatests/google/registry/model/domain/LrpTokenTest.java

@@ -20,6 +20,7 @@ import static google.registry.testing.DatastoreHelper.createTld;
 import static google.registry.testing.DatastoreHelper.persistActiveDomainApplication;
 import static google.registry.testing.DatastoreHelper.persistResource;
 
+import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableSet;
 import com.googlecode.objectify.Key;
 import google.registry.model.EntityTestCase;
@@ -51,6 +52,7 @@ public class LrpTokenTest extends EntityTestCase {
             .setAssignee("1:1020304")
             .setToken("a0b1c2d3e4f5g6")
             .setValidTlds(ImmutableSet.of("tld"))
+            .setMetadata(ImmutableMap.of("foo", "bar"))
             .build());
     redeemedToken = persistResource(
         new LrpToken.Builder()
@@ -59,6 +61,7 @@ public class LrpTokenTest extends EntityTestCase {
             .setRedemptionHistoryEntry(
                 Key.create(applicationCreateHistoryEntry))
             .setValidTlds(ImmutableSet.of("tld"))
+            .setMetadata(ImmutableMap.of("bar", "foo"))
             .build());
   }