cloudfront_config.go

func createCloudfrontDistro(s *session.Session, functionARN string) {
	cdnHandler := cloudfront.New(s)
  
	config := &cloudfront.CreateDistributionInput{
		DistributionConfig: &cloudfront.DistributionConfig{
			CallerReference: aws.String(bucketNameOrigin),
			Comment:         aws.String(bucketNameOrigin),
			Enabled:         aws.Bool(true),
			Origins: &cloudfront.Origins{ // here we tell cloudfront that we want to use a Bucket as origin
				Quantity: aws.Int64(1),
				Items: []*cloudfront.Origin{
					{
						S3OriginConfig: &cloudfront.S3OriginConfig{
							OriginAccessIdentity: aws.String(""), // this would have a value if you chose to use an access ID to restrict bucket access
						},
						Id:         aws.String("ORIGIN_ID"),
						DomainName: aws.String(bucketNameOrigin + ".s3.amazonaws.com"),
					},
				},
			},
			DefaultCacheBehavior: &cloudfront.DefaultCacheBehavior{
				MinTTL:               aws.Int64(10),
				Compress:             aws.Bool(true),
				TargetOriginId:       aws.String("ORIGIN_ID"),
				ViewerProtocolPolicy: aws.String("redirect-to-https"),
				LambdaFunctionAssociations: &cloudfront.LambdaFunctionAssociations{ // this is where we add Lambda@Edge to our CDN
					Items: []*cloudfront.LambdaFunctionAssociation{
						{
							LambdaFunctionARN: aws.String(functionARN),
							IncludeBody:       aws.Bool(false),
							EventType:         aws.String("origin-request"), // you can change the event type according to your needs
						},
					},
					Quantity: aws.Int64(1),
				},
				ForwardedValues: &cloudfront.ForwardedValues{ // we don't do anything here, but we need to define the nullish config here
					QueryString: aws.Bool(false),
					Cookies: &cloudfront.CookiePreference{
						Forward: aws.String("none"),
					},
				},
				TrustedSigners: &cloudfront.TrustedSigners{
					Quantity: aws.Int64(0),
					Enabled:  aws.Bool(false),
				},
			},
		},
	}

	_, err := cdnHandler.CreateDistribution(config)
	if err != nil {
		panic("Could not create CDN" + err.Error())
	}
}