A lot of code was taken from express-sharp.
npm install
Create a .env file with those required keys:
NODE_ENV=production
BASE_HOST=s3.amazonaws.com
BUCKETS=[comma separated list of whitelisted S3 buckets]
Sample url:
curl http://localhost:8000/resize/my_image.png?crop=limit&height=800&url=my_s3_bucket/image_path.png.png&version=3&width=1000
npm install -g foreman
You can use the ./deploy.sh script as a sample script for deployment.