package s3

import (
	"encoding/base64"
	"fmt"
	"path"
)

func DecodeBase64Hash(hash string) ([]byte, error) {
	hashBytes := make([]byte, 32)
	n, err := base64.RawStdEncoding.Decode(hashBytes, []byte(hash))
	if err != nil {
		return nil, err
	}
	if n != 32 {
		return nil, fmt.Errorf("invalid hash length: %d", n)
	}

	return hashBytes, nil
}

func JoinKey(comps ...string) string {
	return path.Join(comps...)
}

func BaseKey(key string) string {
	return path.Base(key)
}