docs(route53): crossaccountrole scope-down guidance

packages/aws-cdk-lib/aws-route53/README.md

@@ -182,7 +182,7 @@ new route53.ARecord(this, 'ARecord', {
 ### Cross Account Zone Delegation
 
 If you want to have your root domain hosted zone in one account and your subdomain hosted
-zone in a diferent one, you can use `CrossAccountZoneDelegationRecord` to set up delegation
+zone in a different one, you can use `CrossAccountZoneDelegationRecord` to set up delegation
 between them.
 
 In the account containing the parent hosted zone:
@@ -196,6 +196,36 @@ const crossAccountRole = new iam.Role(this, 'CrossAccountRole', {
   roleName: 'MyDelegationRole',
   // The other account
   assumedBy: new iam.AccountPrincipal('12345678901'),
+  // You can scope down this role policy to be least privileged.
+  // If you want the other account to be able to manage specific records,
+  // you can scope down by resource and/or normalized record names
+  inlinePolicies: {
+    crossAccountPolicy: new iam.PolicyDocument({
+      statements: [
+        new iam.PolicyStatement({
+          sid: 'ListHostedZonesByName',
+          effect: iam.Effect.ALLOW,
+          actions: ['route53:ListHostedZonesByName'],
+          resources: ['*'],
+        }),
+        new iam.PolicyStatement({
+          sid: 'GetHostedZoneAndChangeResourceRecordSet',
+          effect: iam.Effect.ALLOW,
+          actions: ['route53:GetHostedZone', 'route53:ChangeResourceRecordSet'],
+          // This example assumes the RecordSet subdomain.somexample.com
+          // is contained in the HostedZone
+          resources: ['arn:aws:route53:::hostedzone/HZID00000000000000000'],
+          conditions: {
+            'ForAllValues:StringLike': {
+              'route53:ChangeResourceRecordSetsNormalizedRecordNames': [
+                'subdomain.someexample.com',
+              ],
+            },
+          },
+        }),
+      ],
+    }),
+  },
 });
 parentZone.grantDelegation(crossAccountRole);
 ```