Generate complex password

internal/controller/mysqluser_controller.go

@@ -190,7 +190,11 @@ func (r *MySQLUserReconciler) Reconcile(ctx context.Context, req ctrl.Request) (
 	if err != nil {
 		if errors.IsNotFound(err) { // Secret doesn't exists -> generate password
 			log.Info("[password] Generate new password for Secret", "secretName", secretName)
-			password = utils.GenerateRandomString(16)
+			password, genErr := utils.GenerateComplexRandomString(16)
+			if genErr != nil {
+			    log.Error(genErr, "[password] Failed to generate password")
+			    return ctrl.Result{}, genErr // Handle error
+		    }
 		} else {
 			log.Error(err, "[password] Failed to get Secret", "secretName", secretName)
 			return ctrl.Result{}, err // requeue

internal/utils/utils_oci.go

@@ -0,0 +1,28 @@
+package utils
+
+import (
+	"crypto/rand"
+	"math/big"
+)
+
+const (
+	letterBytes   = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	numberBytes   = "0123456789"
+	specialBytes  = "!@#$%^&*()-_=+[]{}|;:,.<>?/~`"
+	allBytes      = letterBytes + numberBytes + specialBytes
+)
+
+// GenerateComplexRandomString generates a random string of specified length with a mix of letters, numbers, and special characters.
+func GenerateComplexRandomString(length int) (string, error) {
+	result := make([]byte, length)
+
+	for i := 0; i < length; i++ {
+		index, err := rand.Int(rand.Reader, big.NewInt(int64(len(allBytes))))
+		if err != nil {
+			return "", err
+		}
+		result[i] = allBytes[index.Int64()]
+	}
+	return string(result), nil
+}
+