feat(cdk): enables customization of the API domain

While the Next.js rewrite support works nicely, it increases the total cost of the deployment since the server API will be charged while the real backend does its work. This gets worse when the backend is also deployed as a lambda function on the same account, as they will consume two concurrent execution quotas.
sladg · Jan 3, 2023 · 2f724a8 · 2f724a8
1 parent 688fd7f
commit 2f724a8
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Showing 4 changed files with 8 additions and 2 deletions.
diff --git a/lib/cdk/app.ts b/lib/cdk/app.ts
@@ -38,6 +38,7 @@ new NextStandaloneStack(app, process.env.STACK_NAME, {
 	imageLambdaMemory: process.env.LAMBDA_MEMORY ? Number(process.env.IMAGE_LAMBDA_MEMORY) : IMAGE_LAMBDA_DEFAULT_MEMORY,
 	hostedZone: process.env.HOSTED_ZONE ?? undefined,
 	dnsPrefix: process.env.DNS_PREFIX ?? undefined,
+	customApiDomain: process.env.CUSTOM_API_DOMAIN ?? undefined,
 	env: {
 		account: process.env.CDK_DEFAULT_ACCOUNT,
 		region: process.env.CDK_DEFAULT_REGION,

diff --git a/lib/cdk/stack.ts b/lib/cdk/stack.ts
@@ -2,6 +2,7 @@ import { HttpApi } from '@aws-cdk/aws-apigatewayv2-alpha'
 import { App, Stack } from 'aws-cdk-lib'
 import { ICertificate } from 'aws-cdk-lib/aws-certificatemanager'
 import { IDistribution } from 'aws-cdk-lib/aws-cloudfront'
+import { HttpOrigin } from 'aws-cdk-lib/aws-cloudfront-origins'
 import { Function } from 'aws-cdk-lib/aws-lambda'
 import { HostedZone, IHostedZone } from 'aws-cdk-lib/aws-route53'
 import { Bucket } from 'aws-cdk-lib/aws-s3'
@@ -76,6 +77,7 @@ export class NextStandaloneStack extends Stack {
 			serverBasePath: config.apigwServerPath,
 			domainName: config.dnsPrefix ? `${config.dnsPrefix}.${config.hostedZone}` : config.hostedZone,
 			certificate: this.cfnCertificate,
+			customApiOrigin: config.customApiDomain ? new HttpOrigin(config.customApiDomain) : undefined,
 		})
 
 		this.uploadStaticAssets({

diff --git a/lib/cdk/types.ts b/lib/cdk/types.ts
@@ -17,4 +17,5 @@ export interface CustomStackProps extends StackProps {
 	imageLambdaMemory?: number
 	hostedZone?: string
 	dnsPrefix?: string
+	customApiDomain?: string
 }
diff --git a/lib/cdk/utils/cfnDistro.ts b/lib/cdk/utils/cfnDistro.ts
@@ -8,6 +8,7 @@ import {
 	CachePolicy,
 	CacheQueryStringBehavior,
 	Distribution,
+	IOrigin,
 	PriceClass,
 	ViewerProtocolPolicy,
 } from 'aws-cdk-lib/aws-cloudfront'
@@ -21,9 +22,10 @@ export interface SetupCfnDistroProps {
 	imageBasePath: string
 	serverBasePath: string
 	assetsBucket: Bucket
+	customApiOrigin?: IOrigin
 }
 
-export const setupCfnDistro = (scope: Stack, { apiGateway, imageBasePath, serverBasePath, assetsBucket, domainName, certificate }: SetupCfnDistroProps) => {
+export const setupCfnDistro = (scope: Stack, { apiGateway, imageBasePath, serverBasePath, assetsBucket, domainName, certificate, customApiOrigin }: SetupCfnDistroProps) => {
 	const apiGwDomainName = `${apiGateway.apiId}.execute-api.${scope.region}.amazonaws.com`
 
 	const serverOrigin = new HttpOrigin(apiGwDomainName, { originPath: serverBasePath })
@@ -80,7 +82,7 @@ export const setupCfnDistro = (scope: Stack, { apiGateway, imageBasePath, server
 		additionalBehaviors: {
 			'/api*': {
 				...defaultOptions,
-				origin: serverOrigin,
+				origin: customApiOrigin ?? serverOrigin,
 				allowedMethods: AllowedMethods.ALLOW_ALL,
 				cachePolicy: apiCachePolicy,
 			},