backends

type MetaStorageBackend interface {
	StorageBackend
	List() ([]string, error)
}

type Metadata struct {
	DeleteKey    string
	AccessKey    string
	Sha256sum    string
	Mimetype     string
	Size         int64
	Expiry       time.Time
	ArchiveFiles []string
}

type StorageBackend interface {
	Delete(key string) error
	Exists(key string) (bool, error)
	Head(key string) (Metadata, error)
	Get(key string) (Metadata, io.ReadCloser, error)
	Put(key string, r io.Reader, expiry time.Time, deleteKey, accessKey string) (Metadata, error)
	PutMetadata(key string, m Metadata) error
	Size(key string) (int64, error)
}