fix: make text updates and uploads safer

chfs-ng/internal/api/server.go

@@ -509,13 +509,7 @@ func (s *Server) updatetext(w http.ResponseWriter, r *http.Request) {
 		writeJSONError(w, http.StatusForbidden, "has no privilege")
 		return
 	}
-	f, e := s.Store.Create(p)
-	if e != nil {
-		http.Error(w, e.Error(), 500)
-		return
-	}
-	defer f.Close()
-	if _, e = io.WriteString(f, r.FormValue("text")); e != nil {
+	if e := copyFileToDestination(s.Store, strings.NewReader(r.FormValue("text")), p); e != nil {
 		http.Error(w, e.Error(), 500)
 		return
 	}
@@ -569,10 +563,13 @@ func (s *Server) upload(w http.ResponseWriter, r *http.Request) {
 		for _, h := range hs {
 			target := path.Join(dir, filepath.ToSlash(h.Filename))
 			if e := savePart(s.Store, target, h); e != nil {
+				for _, previous := range saved {
+					_ = s.Store.Remove(previous)
+				}
 				http.Error(w, e.Error(), 500)
 				return
 			}
-			saved = append(saved, h.Filename)
+			saved = append(saved, target)
 		}
 	}
 	for _, name := range saved {
@@ -660,14 +657,19 @@ func (s *Server) upload2(w http.ResponseWriter, r *http.Request) {
 			}
 		}
 	}
+	var saved []string
 	for _, hs := range r.MultipartForm.File {
 		for _, h := range hs {
 			name := strings.TrimPrefix(filepath.ToSlash(h.Filename), "/")
 			target := path.Join(dir, name)
 			if err := savePart(s.Store, target, h); err != nil {
+				for _, previous := range saved {
+					_ = s.Store.Remove(previous)
+				}
 				http.Error(w, err.Error(), 500)
 				return
 			}
+			saved = append(saved, target)
 		}
 	}
 	writeCreated(w)