some fix

server/rutor/utils/utils.go

@@ -1,6 +1,11 @@
 package utils
 
-import "strings"
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"os"
+	"strings"
+)
 
 func ClearStr(str string) string {
 	ret := ""
@@ -12,3 +17,26 @@ func ClearStr(str string) string {
 	}
 	return ret
 }
+
+func MD5File(fname string) string {
+	f, err := os.Open(fname)
+	if err != nil {
+		return ""
+	}
+
+	defer f.Close()
+
+	buf := make([]byte, 1024*1024)
+	h := sha256.New()
+
+	for {
+		bytesRead, err := f.Read(buf)
+		if err != nil {
+			break
+		}
+
+		h.Write(buf[:bytesRead])
+	}
+
+	return hex.EncodeToString(h.Sum(nil))
+}