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Deploy a NextJS application using AWS CDK

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<h1 align="center">
  <div align="center">
      <img align="middle" alt="Typescript" src="./resources/typescript.svg" width=15>
      <img align="middle" alt="Java" src="./resources/java.svg" width=20>
      <img align="middle" alt="Go" src="./resources/go.svg" width=30>
      <img align="middle" alt="Python" src="./resources/python.svg" width=15>
      <img align="middle" alt=".NET" src="./resources/dotnet.svg" width=30>
  </div>
  OpenNext CDK
</h1>
<div align="center">
  <a href="https://github.com/datasprayio/open-next-cdk/actions?query=workflow%3A%22build%22">
    <img align="middle" alt="Build Status" src="https://img.shields.io/github/actions/workflow/status/datasprayio/open-next-cdk/build.yml?style=for-the-badge">
  </a>
  <a href="https://github.com/datasprayio/open-next-cdk/blob/master/LICENSE">
    <img align="middle" alt="License" src="https://img.shields.io/github/license/datasprayio/open-next-cdk?style=for-the-badge">
  </a>
  <a href="https://www.npmjs.com/package/open-next-cdk">
    <img align="middle" alt="NPM release" src="https://img.shields.io/npm/v/open-next-cdk?label=RELEASE&color=blue&style=for-the-badge">
  </a>
</div>
<h3 align="center">Deploy NextJS on AWS using CDK IaC and OpenNext packaging</h3>

### Contents

- [What is this?](#what-is-this)
- [Quickstart](#quickstart)
- [Requirements](#requirements)
- [Advanced](#advanced)
    - [Pre-built OpenNext package](#pre-built-opennext-package)
    - [Additional security](#additional-security)
- [About](#about)
    - [Benefits](#benefits)
    - [Dependencies](#dependencies)
    - [Similar projects](#similar-projects)
       - [Fork from cdk-nextjs](#fork-from-cdk-nextjs)
- [Contributing](#contributing)
    - [Using Projen](#using-projen)

# What is this?

A building block for Amazon's infrastructure-as-code CDK toolkit to deploy a NextJS app using AWS serverless services.

Your NextJS app is packaged using OpenNext to fit the serverless format on Lambda

# Requirements

NextJs versions: >=12.3.0+ (includes 13.0.0+)

Platforms: darwin-arm64, darwin-x64, linux-arm64, linux-x64, win32-arm64, win32-x64

# Quickstart

### NextJS setup

Add a dev dependency `esbuild@0.17.16` to your NextJS project.

```shell
npm install --save-dev esbuild@0.17.16
```

### CDK Construct

Use this construct in your CDK application to deploy your NextJS app to AWS.

<details>
  <summary>Typescript <img align="middle" alt="Typescript" src="./resources/typescript.svg" width=20></summary>

Install the dependency using npm:

```shell
  npm install --save-dev esbuild@0.17.16 open-next-cdk
  ```

Use the construct in your CDK application:

```ts
  import { Nextjs } from 'open-next-cdk';

new Nextjs(this, 'Web', {
    nextjsPath: './web', // relative path to nextjs project root
  });
  ```
</details>
<details>
  <summary>Java <img align="middle" alt="Java" src="./resources/java.svg" width=20></summary>
  <a href="https://search.maven.org/artifact/io.dataspray/open-next-cdk">
    <img align="middle" alt="Maven Central release" src="https://img.shields.io/maven-central/v/io.dataspray/open-next-cdk?style=for-the-badge">
  </a>

Install the dependency using Maven:

```xml
  <dependency>
    <groupId>io.dataspray</groupId>
    <artifactId>open-next-cdk</artifactId>
    <version>x.y.z</version>
  </dependency>
  ```

Use the construct in your CDK application:

```java
  Nextjs.Builder.create(this, getConstructId())
          .nextjsPath("./web")
          .build();
  ```
</details>
<details>
  <summary>Go <img align="middle" alt="Go" src="./resources/go.svg" width=20></summary>

Install the dependency:

```shell
  go get github.com:datasprayio/open-next-cdk.git@go
  ```

Or checkout [the code in the `go` branch](https://github.com/datasprayio/open-next-cdk/tree/go).
</details>
<details>
  <summary>Python <img align="middle" alt="Python" src="./resources/python.svg" width=20></summary>

Install the dependency:

```shell
  pip install open-next-cdk
  ```
</details>
<details>
  <summary>.NET <img align="middle" alt=".NET" src="./resources/dotnet.svg" width=20></summary>

Install the dependency:

```shell
  dotnet add package Dataspray.OpenNextCdk
  ```
</details>
<br/>

This will automatically build your NextJS app and package it for you as part of the CDK construct.

If you would prefer to package it separately, see below:

# Advanced

### Pre-built OpenNext package

You may also provide already pre-built OpenNext package directly by building it yourself first:

```shell
  open-next build
  ```

You will find a new folder `.open-next` which contains the packaging for your NextJS App. Now you can use the construct by instructing it not to build your app, just use the OpenNext folder directly:

```ts
  import { Nextjs } from 'open-next-cdk';

new Nextjs(this, 'Web', {
    openNextPath: './web/.open-next', // relative path to .open-next folder
  });
  ```
</details>

### Additional security
<details>
  <summary>How-to</summary>

```ts
  import { RemovalPolicy, Stack } from "aws-cdk-lib";
  import { Construct } from "constructs";
  import { CfnWebAcl } from "aws-cdk-lib/aws-wafv2";
  import { SecurityPolicyProtocol, type DistributionProps } from "aws-cdk-lib/aws-cloudfront";
  import { Nextjs, type NextjsDistributionProps } from "cdk-nextjs-standalone";
  import { Bucket, BlockPublicAccess, BucketEncryption } from "aws-cdk-lib/aws-s3";

// Because of `WebAcl`, this stack must be deployed in us-east-1. If you want
  // to deploy Nextjs in another region, add WAF in separate stack deployed in us-east-1
  export class UiStack {
    constructor(scope: Construct, id: string) {
      const webAcl = new CfnWebAcl(this, "WebAcl", { ... });
      new Nextjs(this, "NextSite", {
        nextjsPath: "...",
        defaults: {
          assetDeployment: {
            bucket: new Bucket(this, "NextjsAssetDeploymentBucket", {
              autoDeleteObjects: true,
              removalPolicy: RemovalPolicy.DESTROY,
              encryption: BucketEncryption.S3_MANAGED,
              enforceSSL: true,
              blockPublicAccess: BlockPublicAccess.BLOCK_ALL,
            }),
          },
          distribution: {
            functionUrlAuthType: FunctionUrlAuthType.AWS_IAM,
            cdk: {
              distribution: {
                webAclId: webAcl.attrArn,
                minimumProtocolVersion: SecurityPolicyProtocol.TLS_V1_2_2021,
              } as DistributionProps,
            },
          } satisfies Partial<NextjsDistributionProps>,
        },
      });
    }
  }
  ```

</details>
<br />

# About

Deploys a NextJs static site with server-side rendering and API support. Uses AWS lambda and CloudFront.

There is a new (since Next 12) [standalone output mode which uses output tracing](https://nextjs.org/docs/advanced-features/output-file-tracing) to generate a minimal server and static files.
This standalone server can be converted into a CloudFront distribution and a lambda handler that handles SSR, API, and routing.

The CloudFront default origin first checks S3 for static files and falls back to an HTTP origin using a lambda function URL.

## Benefits

This approach is most compatible with new NextJs features such as ESM configuration, [middleware](https://nextjs.org/docs/advanced-features/middleware), next-auth, and React server components ("appDir").

The unmaintained [@serverless-nextjs project](https://github.com/serverless-nextjs/serverless-next.js) uses the deprecated `serverless` NextJs build target which [prevents the use of new features](https://github.com/serverless-nextjs/serverless-next.js/pull/2478).
This construct was created to use the new `standalone` output build and newer AWS features like lambda function URLs and fallback origins.

You may want to look at [Serverless Stack](https://sst.dev) and its [NextjsSite](https://docs.sst.dev/constructs/NextjsSite) construct for an improved developer experience if you are building serverless applications on CDK.

## Dependencies

Built on top of [open-next](https://open-next.js.org/), which was partially built using the original core of cdk-nextjs-standalone.

## Similar projects
This project is heavily based on

- [Open-next](https://open-next.js.org/)
- <https://github.com/iiroj/iiro.fi/commit/bd43222032d0dbb765e1111825f64dbb5db851d9>
- <https://github.com/sladg/nextjs-lambda>
- <https://github.com/serverless-nextjs/serverless-next.js/tree/master/packages/compat-layers/apigw-lambda-compat>
- [Serverless Stack](https://github.com/serverless-stack/sst)
  - [RemixSite](https://github.com/serverless-stack/sst/blob/master/packages/resources/src/NextjsSite.ts) construct
  - [NextjsSite](https://github.com/serverless-stack/sst/blob/master/packages/resources/src/RemixSite.ts) construct

### Fork from cdk-nextjs
Compatible with: `cdk-nextjs`[@3.2.1](https://github.com/jetbridge/cdk-nextjs/releases/tag/v3.2.1)

This project has been initially forked from [cdk-nextjs](https://github.com/jetbridge/cdk-nextjs) in order to [publish the package to other langugages](https://github.com/jetbridge/cdk-nextjs/issues/120#issuecomment-1634926223). So far notable changes are:
- Extended language support: TS, Java, Go, .NET, Python.
- Extended platform support: darwin-arm64, darwin-x64, linux-arm64, linux-x64, win32-arm64, win32-x64
- Use pre-built open-next package

# Contributing

Hey there, we value every new contribution a lot 🙏🏼 thank you. Open an issue or a PR and we'll gladly help you out.

## Using Projen
Most boilerplate files are pre-generated including package.json. Don't update it directly, rather update `.projenrc.js` then run `yarn projen` to re-generate the files.

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