refactor and to go mod

server/utils/strings.go

@@ -0,0 +1,48 @@
+package utils
+
+import (
+	"fmt"
+	"strconv"
+)
+
+const (
+	_ = 1.0 << (10 * iota) // ignore first value by assigning to blank identifier
+	KB
+	MB
+	GB
+	TB
+	PB
+	EB
+)
+
+func Format(b float64) string {
+	multiple := ""
+	value := b
+
+	switch {
+	case b >= EB:
+		value /= EB
+		multiple = "EB"
+	case b >= PB:
+		value /= PB
+		multiple = "PB"
+	case b >= TB:
+		value /= TB
+		multiple = "TB"
+	case b >= GB:
+		value /= GB
+		multiple = "GB"
+	case b >= MB:
+		value /= MB
+		multiple = "MB"
+	case b >= KB:
+		value /= KB
+		multiple = "KB"
+	case b == 0:
+		return "0"
+	default:
+		return strconv.FormatInt(int64(b), 10) + "B"
+	}
+
+	return fmt.Sprintf("%.2f%s", value, multiple)
+}