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# @cloudcomponents/cdk-lambda-at-edge-pattern 

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> CDK Constructs for Lambda@Edge pattern: HttpHeaders

## Install
TypeScript/JavaScript:

```bash
npm i @cloudcomponents/cdk-lambda-at-edge-pattern 
```

Python:

```bash
pip install cloudcomponents.cdk-lambda-at-edge-pattern 
```

## How to use

```typescript
import { StaticWebsite } from '@cloudcomponents/cdk-static-website';
import { OriginMutation } from '@cloudcomponents/cdk-lambda-at-edge-pattern';
import { RemovalPolicy, Stack, StackProps, aws_route53 } from 'aws-cdk-lib';

import { Construct } from 'constructs';

export class StaticWebsiteStack extends Stack {
  constructor(scope: Construct, id: string, props: StackProps) {
    super(scope, id, props);

    const hostedZone = aws_route53.HostedZone.fromLookup(this, 'HostedZone', {
      domainName: 'cloudcomponents.org',
    });

    // Create a lambda at edge
    const originMutation = new OriginMutation(stack, 'OriginMutation');

    new StaticWebsite(this, 'StaticWebsite', {
      hostedZone,
      domainNames: ['cloudcomponents.org', 'www.cloudcomponents.org'],
      edgeLambdas: [originMutation],
      removalPolicy: RemovalPolicy.DESTROY,
    });
  }
}
```

### Cloudfront Distribution
```typescript
new cloudfront.Distribution(this, 'myDist', {
  defaultBehavior: {
    origin: new origins.S3Origin(myBucket),
    edgeLambdas: [httpHeaders],
  },
});
```

### HttpHeaders
```typescript
const httpHeaders = new HttpHeaders(this, 'HttpHeaders', {
  httpHeaders: {
    'Content-Security-Policy':
      "default-src 'none'; img-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; object-src 'none'; connect-src 'self'",
    'Strict-Transport-Security':
      'max-age=31536000; includeSubdomains; preload',
    'Referrer-Policy': 'same-origin',
    'X-XSS-Protection': '1; mode=block',
    'X-Frame-Options': 'DENY',
    'X-Content-Type-Options': 'nosniff',
    'Cache-Control': 'no-cache',
  },
});
```

### OriginMutation
https://chrisschuld.com/2020/05/gatsby-hosting-on-cloudfront/

```typescript
const originMutation = new OriginMutation(stack, 'OriginMutation');
```

## API Reference

See [API.md](https://github.com/cloudcomponents/cdk-constructs/tree/master/packages/cdk-lambda-at-edge-pattern/API.md).

## Example

See more complete [examples](https://github.com/cloudcomponents/cdk-constructs/tree/master/examples).

## License

[MIT](https://github.com/cloudcomponents/cdk-constructs/tree/master/packages/cdk-lambda-at-edge-pattern/LICENSE)
