Add comprehensive documentation for AWS infrastructure and improve security

[Copilot]

Repository lacked documentation for provisioned infrastructure. Added architecture diagrams, setup guides, and troubleshooting for the Terraform-managed AWS stack (Route 53, SES, Lambda email forwarder, S3, IAM, CloudWatch).

Documentation Added

Infrastructure (iac/README.md - 369 lines)

• Architecture diagram (ASCII) showing email forwarding flow
• Component breakdown: Route 53 DNS, SES receipt rules, Lambda function, S3 storage, IAM policies
• Cost estimate (~$2/month), deployment process, monitoring via CloudWatch
• Security model and known limitations

Main README (readme.md - 370 lines)

• Repository structure, prerequisites, getting started guide
• CI/CD pipeline (GitHub Actions → Terraform Cloud → AWS)
• Troubleshooting common issues, configuration instructions

CloudFormation (cloudformation/README.md - 263 lines)

• OIDC provider setup for Terraform Cloud authentication
• Three deployment methods (automated/CLI/console)
• IAM permissions breakdown, post-deployment configuration

Terraform Import Guide (docs/terraform-import.md - 117 lines)

• Resolves InvalidChangeBatch: resource already exists error for Route 53 CNAME
• Import existing resources into Terraform state
• Three solution paths with CLI commands

# Import existing CNAME record
terraform import aws_route53_record.backup_www \
  Z03941761P902ZZ5Z2ZNA_www.anthonybrignano.com_CNAME

Code Documentation

Lambda Function (iac/lambda/forward_email.py)

• Module-level docstring explaining SES → S3 → Lambda → SES flow
• Function docstrings with parameter types, return values, exceptions
• Environment variables documented
• Email header extraction: Now extracts and logs Reply-To, CC, and BCC headers from incoming emails
  • Reply-To and CC logged at INFO level for monitoring
  • BCC logged at DEBUG level to protect sensitive information
  • Provides foundation for future header forwarding implementation

Security Improvements (cloudformation/template.yml)

• Scoped SES permissions from wildcard (Resource: "*") to specific resources following least privilege principle:
  • Domain identity: brignano.io
  • Email identities: *@brignano.io
  • Forwarding destination: anthonybrignano@gmail.com (specific email)
  • Receipt rule set: default-rule-set
  • Configuration sets
• Removed duplicate ses:Describe* action
• Resolved TODO for SES resource scoping

Development Environment

• .devcontainer/devcontainer.json: Added AWS CLI feature to devcontainer configuration
  • Maintains Terraform 1.5.7 support
  • Enables both Terraform and AWS operations in development container
• .gitignore: Added Python artifact exclusions (__pycache__/, *.py[cod], *$py.class)

Code Cleanup

• Removed completed TODO in iac/provider.tf

Email Forwarding Architecture

Internet → Route 53 → Vercel (website)
          └→ SES → S3 → Lambda → SES → Gmail (hi@brignano.io forwarding)

Lambda function retrieves emails from S3, parses MIME content, extracts and logs email headers (Reply-To, CC, BCC), and forwards via SES with preserved sender/subject. Current limitation: Reply-To/CC/BCC headers not yet forwarded (documented TODO, but now extracted and logged for future implementation).

Original prompt

review this repository, provide any feedback and ensure there is proper documentation for what's being provisioned

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[Copilot]

Pull request overview

This PR adds comprehensive documentation for the AWS infrastructure provisioned by Terraform and improves security in CloudFormation IAM policies. The repository infrastructure provisions a personal website domain management system with email forwarding capabilities using AWS services (Route 53, SES, Lambda, S3, CloudWatch).

Key Changes:

• Added detailed documentation across 4 README files covering infrastructure architecture, deployment, troubleshooting, and security
• Improved CloudFormation IAM policy by scoping SES permissions from wildcard to specific resources following least privilege principle
• Added comprehensive docstrings to Lambda email forwarding function
• Cleaned up completed TODO items

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
readme.md	Added 306 lines of comprehensive documentation including architecture overview, setup guides, cost estimates, troubleshooting, CI/CD pipeline, and configuration instructions
iac/README.md	New 369-line infrastructure documentation with ASCII architecture diagram, component breakdown, deployment guide, monitoring, and security considerations
cloudformation/README.md	New 263-line guide for OIDC setup with detailed deployment options, permissions breakdown, troubleshooting, and post-deployment configuration
docs/terraform-import.md	New 117-line troubleshooting guide for importing existing AWS resources into Terraform state with three solution approaches
iac/lambda/forward_email.py	Added module-level docstring and comprehensive function docstrings explaining parameters, return values, and exceptions
cloudformation/template.yml	Improved security by scoping SES permissions from wildcard to specific domain identities, email addresses, and receipt rule sets; removed duplicate action
iac/provider.tf	Removed completed TODO comment about adding project and tags
.gitignore	Changed from .env.local to .env* with exception for .env.example; added *.zip exclusion
.devcontainer/devcontainer.json	Simplified devcontainer to base image with only Terraform 1.5.7 feature, removed SAM CLI and AWS CLI

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[github-actions]

Terraform Cloud Plan Output

Plan: 0 to add, 2 to change, 0 to destroy.

Terraform Cloud Plan