read owner information in ReadRecycleItem

we have to read the owner information in ReadRecycleItem because the lookup would return the origin node path instead of the deleted node path

Fixes owncloud/ocis#551

changelog/unreleased/fix-ocis-storage-purge.md

@@ -0,0 +1,5 @@
+Bugfix: Fix purging deleted files with the ocis storage
+
+The ocis storage could load the owner information of a deleted file. This caused the storage to not be able to purge deleted files.
+
+https://github.com/owncloud/ocis/issues/551

pkg/storage/fs/ocis/node.go

@@ -124,6 +124,18 @@ func ReadRecycleItem(ctx context.Context, lu *Lookup, key string) (n *Node, tras
 	} else {
 		return
 	}
+	// lookup ownerId in extended attributes
+	if attrBytes, err = xattr.Get(deletedNodePath, ownerIDAttr); err == nil {
+		n.ownerID = string(attrBytes)
+	} else {
+		return
+	}
+	// lookup ownerIdp in extended attributes
+	if attrBytes, err = xattr.Get(deletedNodePath, ownerIDPAttr); err == nil {
+		n.ownerIDP = string(attrBytes)
+	} else {
+		return
+	}
 
 	// get origin node
 	origin = "/"