Imports github.com/aws/aws-sdk-go/aws github.com/aws/aws-sdk-go/aws/credentials github.com/aws/aws-sdk-go/aws/endpoints github.com/aws/aws-sdk-go/aws/session github.com/aws/aws-sdk-go/service/s3 github.com/aws/aws-sdk-go/service/s3/s3manager Standard library imports bytes crypto/md5 encoding/csv encoding/hex encoding/json flag fmt io io/ioutil mime os path path/filepath strings time