# Functions
GetOssDirectory download an OSS "directory" to local path.
IsDirectory tests if the key is acting like a OSS directory.
IsOssErrCode tests if an err is an oss.ServiceError with the specified code.
ListOssDirectory lists all the files which are the descendants of the specified objectKey, if a file has suffix '/', then it is an OSS directory.
# Structs
ArtifactDriver is a driver for OSS.