Imports github.com/aws/aws-sdk-go/aws/credentials github.com/aws/aws-sdk-go/aws/session github.com/aws/aws-sdk-go/service/s3 golang.org/x/image/draw golang.org/x/image/webp github.com/rs/cors github.com/aws/aws-sdk-go/aws Standard library imports archive/zip crypto/md5 encoding/hex errors fmt image image/color image/draw image/jpeg image/png io log math net/http os path/filepath regexp runtime strconv strings sync time slices