public Stream GetFile(FileId id)
{
try
{
var obj = _OssClient.GetObject(_BucketName, id.ToString());
if (!obj.Metadata.UserMetadata.ContainsKey("Expires") || String.IsNullOrWhiteSpace(obj.Metadata.UserMetadata["Expires"]))
return obj.Content;
var expirationTime = obj.Metadata.UserMetadata["Expires"].To<DateTime>();
if (expirationTime > DateTime.Now)
{
return obj.Content;
}
else
{
Delete(id);
return null;
}
}
catch (ServiceException ex)
{
if(ex.ErrorCode == "NoSuchKey")
{
return null;
}
else
{
throw new Exception("aliyun error:" + ex.ErrorCode + ";message:" + ex.ToString());
}
}
}
public bool Exists(FileId id)
{
return _OssClient.DoesObjectExist(_BucketName, id.ToString());
}
public void Delete(FileId id)
{
_OssClient.DeleteObject(_BucketName, id.ToString());
}
public void CreateOrUpdate(FileId id, System.IO.Stream stream)
{
_OssClient.PutObject(_BucketName, id.ToString(), stream);
}
public void CreateOrAppend(FileId id, System.IO.Stream stream)
{
_OssClient.AppendObject(new AppendObjectRequest(_BucketName, id.ToString()){
Content = stream
});
}
public void Copy(FileId sourceId, FileId destId)
{
_OssClient.CopyObject(new CopyObjectRequest(_BucketName, sourceId.ToString(), _BucketName, destId.ToString()));
}