add app

utils/utils.go

@@ -8,6 +8,7 @@ import (
 	"github.com/dchest/captcha"
 	"github.com/gin-contrib/sessions"
 	"github.com/gin-gonic/gin"
+	"math/rand"
 	"net/http"
 	"strings"
 	"time"
@@ -28,6 +29,18 @@ func init() {
 	uncommonInitialismsReplacer = strings.NewReplacer(uncommonInitialismsForReplacer...)
 }
 
+var (
+	letterBytes = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+)
+
+func RandStringBytes(n int) string {
+	b := make([]byte, n)
+	for i := range b {
+		b[i] = letterBytes[rand.Intn(len(letterBytes))]
+	}
+	return string(b)
+}
+
 func Captcha(c *gin.Context, length ...int) {
 	l := captcha.DefaultLen
 	w, h := 107, 36