add backend/file structs

backend/global/base.go

@@ -10,13 +10,19 @@ import (
 const (
 	// DataFolder stores all backend data in
 	DataFolder = "./data/"
-	// FileFolder stores all blob files
+	// FileFolder stores all uploaded blob files
 	FileFolder = DataFolder + "file/"
+	// ImageFolder stores images of questions
+	ImageFolder = DataFolder + "image/"
+	// PaperFolder stores all protected files
+	PaperFolder = DataFolder + "paper/"
 )
 
 func init() {
 	initdir(DataFolder)
 	initdir(FileFolder)
+	initsecuredir(ImageFolder)
+	initsecuredir(PaperFolder)
 }
 
 func initdir(folder string) {
@@ -27,6 +33,14 @@ func initdir(folder string) {
 	}
 }
 
+func initsecuredir(folder string) {
+	err := os.MkdirAll(folder, 0700)
+	if err != nil {
+		logrus.Errorln("[os.MkdirAll]", err)
+		os.Exit(line())
+	}
+}
+
 func line() int {
 	_, _, fileLine, ok := runtime.Caller(2)
 	if ok {