Feature/secure serverless arch - #18
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IsaacTai13 merged 15 commits intoNov 13, 2025
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- Created IAM role and attached least privilege policies for Lambda (logs, SES, secrets) - Created SNS topic 'user-signup-topic' and subscribed Lambda as subscriber - Added Lambda permission allowing SNS to invoke the function
- data source to zip lambda source from ../serverless - created lambda func using Node.js 20 runtime - config env vars (FROM_EMAIL, VERIFY_URL_BASE) - Included source_code_hash for automatic function update when zip content changes
- Created DynamoDB table 'SentEmails' with messageId as primary key - Added IAM policy to grant Lambda dynamodb:GetItem and dynamodb:PutItem permissions - Inserted messageId after successful delivery to avoid duplicates
- using `terraform init -upgrade` cmd - Updated .terraform.lock.hcl to latest compatible provider versions - Ensures consistent provider versions across environments
- RDS, EC2, SecretManager, S3
- Avoid using AWS-managed default keys and instead use customer-managed keys
- to control all encryption and description for our resources
…Manager - Stored Mailgun API key securely in Secrets Manager instead of Lambda env vars - Correct KMS decrypt target resources - Updated Lambda IAM role to allow `secretsmanager:GetSecretValue` and `kms:Decrypt`
- change SNS topic using arn instead of name - fetch AWS account ID via aws_caller_identity - pass it into user_data for runtime configuration
- Adjust format - Add comment
- Added HTTPS listener on port 443 using ACM certificate - Ensured ALB forwards only HTTPS requests to target group
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