feat(route53-targets): Add AppSync target

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

@@ -32,6 +32,19 @@ This library contains Route53 Alias Record targets for:
   });
   ```
 
+* AppSync custom domains
+
+  ```ts
+  import * as appsync from 'aws-cdk-lib/aws-appsync';
+
+  declare const zone: route53.HostedZone;
+  declare const graphqlApi: appsync.GraphqlApi;
+
+  new route53.ARecord(this, 'AliasRecord', {
+    zone,
+    target: route53.RecordTarget.fromAlias(new targets.AppSync(graphqlApi))
+  });
+
 * CloudFront distributions
 
   ```ts

packages/aws-cdk-lib/aws-route53-targets/lib/appsync-target.ts

@@ -0,0 +1,23 @@
+import { CloudFrontTarget } from './cloudfront-target';
+import { GraphqlApi } from '../../aws-appsync';
+import {
+  AliasRecordTargetConfig,
+  IAliasRecordTarget,
+  IHostedZone,
+  IRecordSet,
+} from '../../aws-route53';
+
+/**
+ * Defines an AppSync Graphql API as the alias target. Requires that the domain
+ * name will be defined through `GraphqlApiProps.domainName`.
+ */
+export class AppSync implements IAliasRecordTarget {
+  constructor(private readonly graphqlApi: GraphqlApi) {}
+
+  public bind(_record: IRecordSet, _zone?: IHostedZone): AliasRecordTargetConfig {
+    return {
+      dnsName: this.graphqlApi.appSyncDomainName,
+      hostedZoneId: CloudFrontTarget.getHostedZoneId(this.graphqlApi),
+    };
+  }
+}

packages/aws-cdk-lib/aws-route53-targets/lib/index.ts

@@ -1,5 +1,6 @@
 export * from './api-gateway-domain-name';
 export * from './api-gatewayv2-domain-name';
+export * from './appsync-domain-target';
 export * from './bucket-website-target';
 export * from './elastic-beanstalk-environment-target';
 export * from './classic-load-balancer-target';

packages/aws-cdk-lib/aws-route53-targets/test/appsync-target.test.ts

@@ -0,0 +1,54 @@
+import { join } from 'path';
+import { Template } from '../../assertions';
+import * as appsync from '../../aws-appsync';
+import * as acm from '../../aws-certificatemanager';
+import * as route53 from '../../aws-route53';
+import { Stack } from '../../core';
+import * as targets from '../lib';
+
+test('targets.AppSync can be used to the default domain of an AppSync GraphqlApi', () => {
+  // GIVEN
+  const stack = new Stack();
+  const cert = new acm.Certificate(stack, 'cert', { domainName: 'example.com' });
+  const api = new appsync.GraphqlApi(stack, 'api', {
+    definition: appsync.Definition.fromFile(join(__dirname, '..', '..', 'aws-appsync', 'test', 'appsync.test.graphql')),
+    domainName: {
+      domainName: 'example.com',
+      certificate: cert,
+    },
+    name: 'api',
+  });
+  const zone = new route53.HostedZone(stack, 'zone', {
+    zoneName: 'example.com',
+  });
+
+  // WHEN
+  new route53.ARecord(stack, 'A', {
+    zone,
+    target: route53.RecordTarget.fromAlias(new targets.AppSync(api)),
+  });
+
+  // THEN
+  Template.fromStack(stack).hasResourceProperties('AWS::Route53::RecordSet', {
+    Name: 'example.com.',
+    Type: 'A',
+    AliasTarget: {
+      DNSName: {
+        'Fn::GetAtt': [
+          'apiDomainNameBBFE36A4',
+          'AppSyncDomainName',
+        ],
+      },
+      HostedZoneId: {
+        'Fn::FindInMap': [
+          'AWSCloudFrontPartitionHostedZoneIdMap',
+          { Ref: 'AWS::Partition' },
+          'zoneId',
+        ],
+      },
+    },
+    HostedZoneId: {
+      Ref: 'zoneEB40FF1E',
+    },
+  });
+});