s3sync.sh

#!/usr/bin/env bash

set -euo pipefail
IFS=$'\n\t'

[[ "${DEBUG:-}" == 'true' ]] && set -x

CACHE_CONTROL_DEFAULT="${CACHE_CONTROL_DEFAULT-public, max-age=3600}"
CACHE_CONTROL_DEFAULT_OVERRIDE="${CACHE_CONTROL_DEFAULT_OVERRIDE-public, max-age=60, s-maxage=60}"

s3sync() {
  # Configuration checks
  if [[ -z "${AWS_BUCKET_NAME:-}" ]]; then
    echo "Error: AWS_BUCKET_NAME is not specified"
    exit 128
  fi

  if [[ -z "${AWS_ACCESS_KEY_ID:-}" ]]; then
    echo "Warning: AWS_ACCESS_KEY_ID not specified"
  fi

  if [[ -z "${AWS_SECRET_ACCESS_KEY:-}" ]]; then
    echo "Warning: AWS_SECRET_ACCESS_KEY not specified"
  fi

  CMD=()
  OVERRIDE_CMD=("--exclude" '*')
  
  # Add --dryrun if DEBUG=true
  if [[ "${DEBUG:-}" == "true" ]]; then
    CMD+=("--dryrun")
    OVERRIDE_CMD+=("--dryrun")
  fi

  # Add the Cache Control default if set
  if [[ -n "${CACHE_CONTROL_DEFAULT}" ]]; then
    CMD+=("--cache-control" "${CACHE_CONTROL_DEFAULT}")
  fi

  # Add exclude when an override is set
  while read -r line; do
    # value="$(
    #   export "${line?}"
    #   name="${line%%\=*}"
    #   echo "${!name}"
    # )"
    # IFS=":" read -r -a override <<<"${value}"
    IFS=":" read -r -a override <<<"${line#*\=}"
    CMD+=("--exclude" "${override[0]}")
    echo ">> Adding exclude for: ${override[0]}"
  done < <(env | grep "^CACHE_CONTROL_OVERRIDE")

  # Run the main sync (excludes overrides)
  set -x
  aws s3 sync /var/www/html "s3://${AWS_BUCKET_NAME}" --delete "${CMD[@]}"
  set +x

  # Run the override syncs
  while read -r line; do
    IFS=":" read -r -a override <<<"${line#*\=}"
    echo ">> Override sync for: ${override[0]}"
    cache_control="${override[1]:-${CACHE_CONTROL_DEFAULT_OVERRIDE}}"
    set -x
    aws s3 sync /var/www/html "s3://${AWS_BUCKET_NAME}" --delete "${OVERRIDE_CMD[@]}" --include "${override[0]}" --cache-control "${cache_control}"
    set +x
  done < <(env | grep "^CACHE_CONTROL_OVERRIDE")

}

s3sync
echo ">> Sync done"