fix: marshal size of empty files to the JSON response of CheckFileInfo

pkg/internal/app/fileinfo.go

@@ -13,7 +13,7 @@ type FileInfo struct {
  // A string value uniquely identifying the user currently accessing the file.
  UserID string `json:"UserId,omitempty"`
  // The size of the file in bytes, expressed as a long, a 64-bit signed integer.
- Size int64 `json:"Size,omitempty"`
+ Size *int64 `json:"Size,omitempty"`
  // The current version of the file based on the server’s file version schema, as a string. This value must change when the file changes, and version values must never repeat for a given file.
  Version string `json:"Version,omitempty"`
  // A string that is the name of the user, suitable for displaying in UI.

pkg/internal/app/wopiinfo.go

@@ -37,9 +37,11 @@ func CheckFileInfo(app *demoApp, w http.ResponseWriter, r *http.Request) {
  return
  }
 
+ // must be a pointer otherwise empty files will not have the property set in JSON response
+ size := int64(statRes.Info.Size)
  fileInfo := FileInfo{
  OwnerID: statRes.Info.Owner.OpaqueId + "@" + statRes.Info.Owner.Idp,
- Size: int64(statRes.Info.Size),
+ Size: &size,
  Version: statRes.Info.Mtime.String(),
  BaseFileName: path.Base(statRes.Info.Path),
  BreadcrumbDocName: path.Base(statRes.Info.Path),