AWS Amplify Construct Library

AWS CDK v1 has reached End-of-Support on 2023-06-01. This package is no longer being updated, and users should migrate to AWS CDK v2.

For more information on how to migrate, see the Migrating to AWS CDK v2 guide.

The AWS Amplify Console provides a Git-based workflow for deploying and hosting fullstack serverless web applications. A fullstack serverless app consists of a backend built with cloud resources such as GraphQL or REST APIs, file and data storage, and a frontend built with single page application frameworks such as React, Angular, Vue, or Gatsby.

Setting up an app with branches, custom rules and a domain

To set up an Amplify Console app, define an App:

import * as codebuild from '@aws-cdk/aws-codebuild';

const amplifyApp = new amplify.App(this, 'MyApp', {
  sourceCodeProvider: new amplify.GitHubSourceCodeProvider({
    owner: '<user>',
    repository: '<repo>',
    oauthToken: SecretValue.secretsManager('my-github-token'),
  }),
  buildSpec: codebuild.BuildSpec.fromObjectToYaml({
    // Alternatively add a `amplify.yml` to the repo
    version: '1.0',
    frontend: {
      phases: {
        preBuild: {
          commands: [
            'yarn',
          ],
        },
        build: {
          commands: [
            'yarn build',
          ],
        },
      },
      artifacts: {
        baseDirectory: 'public',
        files:
        - '**/*',
      },
    },
  }),
});

To connect your App to GitLab, use the GitLabSourceCodeProvider:

const amplifyApp = new amplify.App(this, 'MyApp', {
  sourceCodeProvider: new amplify.GitLabSourceCodeProvider({
    owner: '<user>',
    repository: '<repo>',
    oauthToken: SecretValue.secretsManager('my-gitlab-token'),
  }),
});

To connect your App to CodeCommit, use the CodeCommitSourceCodeProvider:

import * as codecommit from '@aws-cdk/aws-codecommit';

const repository = new codecommit.Repository(this, 'Repo', {
  repositoryName: 'my-repo',
});

const amplifyApp = new amplify.App(this, 'App', {
  sourceCodeProvider: new amplify.CodeCommitSourceCodeProvider({ repository }),
});

The IAM role associated with the App will automatically be granted the permission to pull the CodeCommit repository.

Add branches:

declare const amplifyApp: amplify.App;

const master = amplifyApp.addBranch('master'); // `id` will be used as repo branch name
const dev = amplifyApp.addBranch('dev', {
  performanceMode: true, // optional, enables performance mode
});
dev.addEnvironment('STAGE', 'dev');

Auto build and pull request preview are enabled by default.

Add custom rules for redirection:

declare const amplifyApp: amplify.App;
amplifyApp.addCustomRule({
  source: '/docs/specific-filename.html',
  target: '/documents/different-filename.html',
  status: amplify.RedirectStatus.TEMPORARY_REDIRECT,
});

When working with a single page application (SPA), use the CustomRule.SINGLE_PAGE_APPLICATION_REDIRECT to set up a 200 rewrite for all files to index.html except for the following file extensions: css, gif, ico, jpg, js, png, txt, svg, woff, ttf, map, json, webmanifest.

declare const mySinglePageApp: amplify.App;

mySinglePageApp.addCustomRule(amplify.CustomRule.SINGLE_PAGE_APPLICATION_REDIRECT);

Add a domain and map sub domains to branches:

declare const amplifyApp: amplify.App;
declare const master: amplify.Branch;
declare const dev: amplify.Branch;

const domain = amplifyApp.addDomain('example.com', {
  enableAutoSubdomain: true, // in case subdomains should be auto registered for branches
  autoSubdomainCreationPatterns: ['*', 'pr*'], // regex for branches that should auto register subdomains
});
domain.mapRoot(master); // map master branch to domain root
domain.mapSubDomain(master, 'www');
domain.mapSubDomain(dev); // sub domain prefix defaults to branch name

Restricting access

Password protect the app with basic auth by specifying the basicAuth prop.

Use BasicAuth.fromCredentials when referencing an existing secret:

const amplifyApp = new amplify.App(this, 'MyApp', {
  sourceCodeProvider: new amplify.GitHubSourceCodeProvider({
    owner: '<user>',
    repository: '<repo>',
    oauthToken: SecretValue.secretsManager('my-github-token'),
  }),
  basicAuth: amplify.BasicAuth.fromCredentials('username', SecretValue.secretsManager('my-github-token')),
});

Use BasicAuth.fromGeneratedPassword to generate a password in Secrets Manager:

const amplifyApp = new amplify.App(this, 'MyApp', {
  sourceCodeProvider: new amplify.GitHubSourceCodeProvider({
    owner: '<user>',
    repository: '<repo>',
    oauthToken: SecretValue.secretsManager('my-github-token'),
  }),
  basicAuth: amplify.BasicAuth.fromGeneratedPassword('username'),
});

Basic auth can be added to specific branches:

declare const amplifyApp: amplify.App;
amplifyApp.addBranch('feature/next', {
  basicAuth: amplify.BasicAuth.fromGeneratedPassword('username'),
});

Automatically creating and deleting branches

Use the autoBranchCreation and autoBranchDeletion props to control creation/deletion of branches:

const amplifyApp = new amplify.App(this, 'MyApp', {
  sourceCodeProvider: new amplify.GitHubSourceCodeProvider({
    owner: '<user>',
    repository: '<repo>',
    oauthToken: SecretValue.secretsManager('my-github-token'),
  }),
  autoBranchCreation: { // Automatically connect branches that match a pattern set
    patterns: ['feature/*', 'test/*'],
  },
  autoBranchDeletion: true, // Automatically disconnect a branch when you delete a branch from your repository
});

Adding custom response headers

Use the customResponseHeaders prop to configure custom response headers for an Amplify app:

const amplifyApp = new amplify.App(this, 'App', {
  sourceCodeProvider: new amplify.GitHubSourceCodeProvider({
    owner: '<user>',
    repository: '<repo>',
    oauthToken: SecretValue.secretsManager('my-github-token'),
  }),
  customResponseHeaders: [
    {
      pattern: '*.json',
      headers: {
        'custom-header-name-1': 'custom-header-value-1',
        'custom-header-name-2': 'custom-header-value-2',
      },
    },
    {
      pattern: '/path/*',
      headers: {
        'custom-header-name-1': 'custom-header-value-2',
      },
    },
  ],
});

Deploying Assets

sourceCodeProvider is optional; when this is not specified the Amplify app can be deployed to using .zip packages. The asset property can be used to deploy S3 assets to Amplify as part of the CDK:

import * as assets from '@aws-cdk/aws-s3-assets';

declare const asset: assets.Asset;
declare const amplifyApp: amplify.App;
const branch = amplifyApp.addBranch("dev", { asset: asset });