Add exporting list background files

pkg/models/export.go

@@ -21,6 +21,7 @@ import (
 	"archive/zip"
 	"code.vikunja.io/api/pkg/config"
 	"code.vikunja.io/api/pkg/db"
+	"code.vikunja.io/api/pkg/files"
 	"code.vikunja.io/api/pkg/modules/dump"
 	"code.vikunja.io/api/pkg/user"
 	"encoding/json"
@@ -68,6 +69,10 @@ func ExportUserData(u *user.User) (err error) {
 		return err
 	}
 	// Background files
+	err = exportListBackgrounds(s, u, dumpWriter)
+	if err != nil {
+		return err
+	}
 
 	// Pack it in a zip file and save it
 
@@ -170,15 +175,15 @@ func exportTaskAttachments(s *xorm.Session, u *user.User, wr *zip.Writer) (err e
 		return err
 	}
 
-	files := make(map[int64]io.ReadCloser)
+	fs := make(map[int64]io.ReadCloser)
 	for _, ta := range tas {
 		if err := ta.File.LoadFileByID(); err != nil {
 			return err
 		}
-		files[ta.FileID] = ta.File.File
+		fs[ta.FileID] = ta.File.File
 	}
 
-	return dump.WriteFilesToZip(files, wr)
+	return dump.WriteFilesToZip(fs, wr)
 }
 
 func exportSavedFilters(s *xorm.Session, u *user.User, wr *zip.Writer) (err error) {
@@ -194,3 +199,35 @@ func exportSavedFilters(s *xorm.Session, u *user.User, wr *zip.Writer) (err erro
 
 	return dump.WriteBytesToZip("filters.json", data, wr)
 }
+
+func exportListBackgrounds(s *xorm.Session, u *user.User, wr *zip.Writer) (err error) {
+	lists, _, _, err := getRawListsForUser(
+		s,
+		&listOptions{
+			user: u,
+			page: -1,
+		},
+	)
+	if err != nil {
+		return err
+	}
+
+	fs := make(map[int64]io.ReadCloser)
+	for _, l := range lists {
+		if l.BackgroundFileID == 0 {
+			continue
+		}
+
+		bgFile := &files.File{
+			ID: l.BackgroundFileID,
+		}
+		err = bgFile.LoadFileByID()
+		if err != nil {
+			return
+		}
+
+		fs[l.BackgroundFileID] = bgFile.File
+	}
+
+	return dump.WriteFilesToZip(fs, wr)
+}