refactor: obj name mapping and internal path processing (#2733)

* refactor:Prepare to remove the get interface

* feat:add obj Unwarp interface

* refactor:obj name mapping and program internal path processing

* chore: fix typo

* feat: unwrap get

* fix: no use op.Get to get parent id

* fix: set the path uniformly

Co-authored-by: Noah Hsu <i@nn.ci>

internal/model/stream.go

@@ -9,6 +9,7 @@ type FileStream struct {
 	io.ReadCloser
 	Mimetype     string
 	WebPutAsTask bool
+	Old          Obj
 }
 
 func (f *FileStream) GetMimetype() string {
@@ -26,3 +27,7 @@ func (f *FileStream) GetReadCloser() io.ReadCloser {
 func (f *FileStream) SetReadCloser(rc io.ReadCloser) {
 	f.ReadCloser = rc
 }
+
+func (f *FileStream) GetOld() Obj {
+	return f.Old
+}