fix(serverHandler): ensure not mutating aliased item

- prevent doing mkdir if it is an alias
- prevent doing delete if it is an alias

Author: marjune163

src/serverHandler/delete.go

@@ -18,7 +18,8 @@ func (h *handler) deleteItems(fsPrefix string, files []string, aliasSubItems []o
 		if filename, ok = getCleanFilePath(inputFilename); !ok {
 			errs = append(errs, errors.New("delete: illegal item name "+inputFilename))
 			continue
-		} else if containsItem(aliasSubItems, filename) {
+		}
+		if containsItem(aliasSubItems, filename) {
 			continue
 		}
 		err := os.RemoveAll(fsPrefix + "/" + filename)

src/serverHandler/mkdir.go

@@ -18,7 +18,8 @@ func (h *handler) mkdirs(fsPrefix string, files []string, aliasSubItems []os.Fil
 		if filename, ok = getCleanFilePath(inputFilename); !ok {
 			errs = append(errs, errors.New("mkdir: illegal directory name "+inputFilename))
 			continue
-		} else if containsItem(aliasSubItems, filename) {
+		}
+		if containsItem(aliasSubItems, filename) {
 			continue
 		}
 		err := os.Mkdir(fsPrefix+"/"+filename, 0755)