Add copying list backgrounds

pkg/models/list_duplicate.go

@@ -17,6 +17,7 @@
 package models
 
 import (
+	"code.vikunja.io/api/pkg/files"
 	"code.vikunja.io/web"
 )
 
@@ -191,6 +192,39 @@ func (ld *ListDuplicate) Create(a web.Auth) (err error) {
 	}
 
 	// Background files + unsplash info
+	if ld.List.BackgroundFileID != 0 {
+		f := &files.File{ID: ld.List.BackgroundFileID}
+		if err := f.LoadFileMetaByID(); err != nil {
+			return err
+		}
+		if err := f.LoadFileByID(); err != nil {
+			return err
+		}
+		defer f.File.Close()
+
+		file, err := files.Create(f.File, f.Name, f.Size, a)
+		if err != nil {
+			return
+		}
+
+		// Get unsplash info if applicable
+		up, err := GetUnsplashPhotoByFileID(ld.List.BackgroundFileID)
+		if err != nil && files.IsErrFileIsNotUnsplashFile(err) {
+			return err
+		}
+		if up != nil {
+			up.ID = 0
+			up.FileID = file.ID
+			if err := up.Save(); err != nil {
+				return err
+			}
+		}
+
+		ld.List.BackgroundFileID = file.ID
+		if err := CreateOrUpdateList(ld.List); err != nil {
+			return err
+		}
+	}
 
 	// Rights / Shares
 	// Generate new link shares if any are available