acm

Overview

Provisions a single ACM TLS certificate used by API Gateway (custom domain), both CloudFront distributions, and the Cognito custom authentication domain. The certificate must be in us-east-1 to satisfy CloudFront and Cognito requirements; API Gateway is also deployed in us-east-1.

CloudFormation Stack

firefly-acm

Dependencies

Deploy

None — this workflow has no prerequisites.

Delete

• delete-api-gateway — API Gateway custom domain must be deleted before the certificate can be released
• delete-cloudfront-firmware — CloudFront firmware distribution must be deleted first
• delete-cloudfront-fmc — CloudFront FMC distribution must be deleted first
• delete-cognito — Cognito User Pool custom domain must be removed before the certificate can be deleted

Required By

Deploy

• cloudfront-firmware — uses the CertificateArn output for the firmware CloudFront distribution
• cloudfront-fmc — uses the CertificateArn output for the FMC CloudFront distribution
• api-gateway — uses the CertificateArn output for the API custom domain
• cognito — uses the CertificateArn output for the Cognito User Pool custom domain

Delete

None.

---

Deploy Workflow

Description

Builds the SAM template and deploys the firefly-acm CloudFormation stack. ACM validates the certificate via DNS by creating a CNAME record in the Route 53 hosted zone. The stack blocks until the certificate reaches the ISSUED state, which requires DNS propagation — allow up to 30 minutes on first deploy.

The stack exports CertificateArn, which is read by downstream workflows using aws cloudformation describe-stacks.

Steps

1. Checkout repository
2. Configure AWS credentials (us-east-1 required)
3. Install SAM CLI
4. sam build — template: templates/acm.yaml
5. sam deploy — stack: firefly-acm; params: CertificateDomainName (from vars.CERTIFICATE_DOMAIN_NAME), HostedZoneId (from secrets)

Sequence Diagram

---

Delete Workflow

Description

Deletes the firefly-acm CloudFormation stack and the ACM certificate it manages. Must run only after all resources using the certificate (API Gateway custom domain, both CloudFront distributions, and the Cognito custom domain) have been deleted.

Steps

1. Configure AWS credentials (us-east-1 required)
2. Install SAM CLI
3. sam delete --stack-name firefly-acm --no-prompts --region us-east-1

Sequence Diagram

---

Failure Scenarios

Scenario	Cause	Resolution
Certificate DNS validation timeout	ACM waits up to 30 minutes for Route 53 CNAME to propagate; stack rolls back if validation does not complete	Verify the Route 53 hosted zone ID is correct and the domain is delegated properly; re-run the workflow
Stack in ROLLBACK_COMPLETE	A previous failed deploy left the stack in a terminal state	Manually delete the stack in the AWS Console or via CLI, then re-run
DELETE_FAILED — certificate still in use	Certificate is still associated with a CloudFront distribution, API Gateway custom domain, or Cognito User Pool custom domain	Ensure delete-cloudfront-firmware, delete-cloudfront-fmc, delete-api-gateway, and delete-cognito all completed successfully before re-running delete