Bug fix: fix GetRandString return same result

consts.go

@@ -3,7 +3,7 @@ package dotweb
 // Global define
 const (
 	// Version current version
-	Version = "1.7.16"
+	Version = "1.7.17"
 )
 
 // Log define

dotweb.go

@@ -670,7 +670,7 @@ func (app *DotWeb) printDotLogo() {
 	app.Logger().Print(`  / / / / / __ \ / __/| | /| / / / _ \  / __ \`, LogTarget_HttpServer)
 	app.Logger().Print(` / /_/ / / /_/ // /_  | |/ |/ / /  __/ / /_/ /`, LogTarget_HttpServer)
 	app.Logger().Print(`/_____/  \____/ \__/  |__/|__/  \___/ /_.___/`, LogTarget_HttpServer)
-	app.Logger().Print(`                             Version 1.7.14`, LogTarget_HttpServer)
+	app.Logger().Print(`                             Version `+Version, LogTarget_HttpServer)
 }
 
 // Close immediately stops the server.

framework/crypto/cryptos.go

@@ -1,10 +1,11 @@
 package cryptos
 
 import (
+	"bytes"
 	"crypto/md5"
-	"math/rand"
+	"crypto/rand"
 	"encoding/hex"
-	"time"
+	"math/big"
 )
 
 // GetMd5String compute the md5 sum as string
@@ -16,11 +17,14 @@ func GetMd5String(s string) string {
 
 // GetRandString returns randominzed string with given length
 func GetRandString(length int) string {
-	bytes := []byte("0123456789abcdefghijklmnopqrstuvwxyz")
-	result := []byte{}
-	r := rand.New(rand.NewSource(time.Now().UnixNano()))
+	var container string
+	var str = "0123456789abcdefghijklmnopqrstuvwxyz"
+	b := bytes.NewBufferString(str)
+	len := b.Len()
+	bigInt := big.NewInt(int64(len))
 	for i := 0; i < length; i++ {
-		result = append(result, bytes[r.Intn(len(bytes))])
+		randomInt, _ := rand.Int(rand.Reader, bigInt)
+		container += string(str[randomInt.Int64()])
 	}
-	return string(result)
+	return container
 }

framework/crypto/cryptos_test.go

@@ -17,6 +17,13 @@ func Test_GetMd5String_1(t *testing.T) {
 
 func Test_GetRandString(t *testing.T) {
 	randStr := GetRandString(12)
-	t.Log("GetRandString:", randStr)
-	test.Equal(t, 12, len(randStr))
+	rand1 := GetRandString(12)
+	rand2 := GetRandString(12)
+	rand3 := GetRandString(12)
+	if rand1 == rand2 || rand2 == rand3 || rand1 == rand3 {
+		t.Error("rand result is same")
+	} else {
+		t.Log("GetRandString:", randStr)
+		test.Equal(t, 12, len(randStr))
+	}
 }

version.MD

@@ -1,5 +1,9 @@
 ## dotweb版本记录：
 
+####Version 1.7.17
+* Bug fix: fix GetRandString return same result
+* 2021-01-29 08:00 at ShangHai
+
 ####Version 1.7.16
 * Bug fix: fix middleware chain misbehaving in netsed groups
 * Tips: for issue #234, thanks for @live's code