(#1)

- refactored User service from IceWhaleTech/CasaOS as first modularized service

pkg/utils/random/random.go

@@ -0,0 +1,24 @@
+package random
+
+import (
+	"math/rand"
+	"time"
+)
+
+func RandomString(n int, onlyLetter bool) string {
+
+	var letters []rune
+
+	if onlyLetter {
+		letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
+	} else {
+		letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
+	}
+
+	b := make([]rune, n)
+	rand.Seed(time.Now().UnixNano())
+	for i := range b {
+		b[i] = letters[rand.Intn(len(letters))]
+	}
+	return string(b)
+}