Add function number.RandomInt64

server/backgrounds/handler.go

@@ -2,10 +2,8 @@ package backgrounds
 
 import (
 	"context"
-	"crypto/rand"
 	"encoding/base64"
 	"errors"
-	"math/big"
 	"net/http"
 	"net/url"
 	"path"
@@ -14,6 +12,7 @@ import (
 
 	"github.com/navidrome/navidrome/consts"
 	"github.com/navidrome/navidrome/log"
+	"github.com/navidrome/navidrome/utils/number"
 	"gopkg.in/yaml.v3"
 )
 
@@ -52,8 +51,8 @@ func (h *Handler) getRandomImage(ctx context.Context) (string, error) {
 	if len(list) == 0 {
 		return "", errors.New("no images available")
 	}
-	rnd, _ := rand.Int(rand.Reader, big.NewInt(int64(len(list))))
-	return list[rnd.Int64()], nil
+	rnd := number.RandomInt64(int64(len(list)))
+	return list[rnd], nil
 }
 
 func (h *Handler) getImageList(ctx context.Context) ([]string, error) {

utils/number/number.go

@@ -1,6 +1,11 @@
 package number
 
-import "golang.org/x/exp/constraints"
+import (
+	"crypto/rand"
+	"math/big"
+
+	"golang.org/x/exp/constraints"
+)
 
 func Min[T constraints.Ordered](vs ...T) T {
 	if len(vs) == 0 {
@@ -29,3 +34,8 @@ func Max[T constraints.Ordered](vs ...T) T {
 	}
 	return max
 }
+
+func RandomInt64(max int64) int64 {
+	rnd, _ := rand.Int(rand.Reader, big.NewInt(max))
+	return rnd.Int64()
+}

utils/weighted_random_chooser.go

@@ -1,9 +1,9 @@
 package utils
 
 import (
-	"crypto/rand"
 	"errors"
-	"math/big"
+
+	"github.com/navidrome/navidrome/utils/number"
 )
 
 type WeightedChooser struct {
@@ -41,9 +41,7 @@ func (w *WeightedChooser) weightedChoice() (int, error) {
 	if w.totalWeight == 0 {
 		return 0, errors.New("no choices available")
 	}
-	rndBig, _ := rand.Int(rand.Reader, big.NewInt(int64(w.totalWeight)))
-
-	rnd := rndBig.Int64()
+	rnd := number.RandomInt64(int64(w.totalWeight))
 	for i, weight := range w.weights {
 		rnd -= int64(weight)
 		if rnd < 0 {