CI/ CD Pipeline for an Angular project

The AWS Cloud Development Kit (CDK) is used to build and expose an Angular application using AWS CloudFront.

The source code

The Angular source code is stored in one of my GitHub repositories. It is a very basic application that can be build by executing

ng build --prod

The build pipeline

The build pipeline consists of two stages, the sourceStage and the buildStage.

const sourceStage = pipeline.addStage({
    stageName: "Source"
});

const buildStage = pipeline.addStage({
    stageName: "Build",
    placement: {
    justAfter: sourceStage
    }
});

The sourceStage contains only a single action responsible for monitoring changes on the code repository

const sourceAction = new GitHubSourceAction({
    actionName: "GitHub",
    owner: "stefanfreitag",
    repo: "angular-hello-world",
    oauthToken: SecretValue.secretsManager("my-github-token"),
    output: sourceOutput,
    branch: "master",
    trigger: GitHubTrigger.POLL
});

sourceStage.addAction(sourceAction);

In the buildstage a CodeBuild project is executed. As part of the project the required software is installed: all required libraries, the AWS as well as the Angular CLI.

npm install
pip install awscli --upgrade --user,
npm i -g @angular/cli"

In the next phase of the project ng build --prod runs and generated the distribution files.

The last phase is responsible for updating the content of the used S3 bucket.

aws s3 rm s3://${websiteBucket.bucketName}/ --recursive
aws s3 cp ./dist/angular-hello-world s3://${websiteBucket.bucketName}/ --recursive

The CloudFront setup

The S3 bucket websiteBucket is not exposed directly to the Internet, CloudFront will be installed in between. Hence the publicReadAccess and blockPublicAccess are set to false settings.

const websiteBucket = new Bucket(this, "bucket", {
  websiteIndexDocument: "index.html",
  publicReadAccess: false,
  encryption: BucketEncryption.S3_MANAGED,
  blockPublicAccess: {
    restrictPublicBuckets: false,
    blockPublicAcls: false,
    ignorePublicAcls: false,
    blockPublicPolicy: false,
  },
   removalPolicy: RemovalPolicy.DESTROY,
});

To allow CloudFront access to the content of the S3 bucket a user is setup

const oai = new OriginAccessIdentity(this, "originAccessIdentity", {
  comment: "Allows CloudFront to reach the bucket",
});
websiteBucket.grantRead(oai);

The CloudFrontWebDistribution contains aside from the websiteBucket and the user information also another bucket used to store the access logs.

new CloudFrontWebDistribution(this, "myDistribution", {
  originConfigs: [
    {
      s3OriginSource: {
        s3BucketSource: websiteBucket,
        originAccessIdentity: oai,
      },
      behaviors: [{ isDefaultBehavior: true }],
    }],
    comment: "Demo CloudFront Distribution",
    loggingConfig: {
      bucket: accessLogsBucket,
      prefix: "ng-s3-demo",
      includeCookies: true,
    },
    priceClass: PriceClass.PRICE_CLASS_100,
});