Imports github.com/kelseyhightower/envconfig github.com/gorilla/mux github.com/thraxil/resize github.com/mitchellh/goamz/aws github.com/mitchellh/goamz/s3 github.com/go-kit/kit/log Standard library imports context crypto/sha1 encoding/json errors fmt io io/ioutil log net/http os os/signal path path/filepath strings syscall time