feat: download/upgrade XD to external-ui

config/utils.go

@@ -1,15 +1,37 @@
 package config
 
 import (
+	"context"
 	"fmt"
+	"io"
 	"net"
+	"net/http"
 	"net/netip"
+	"os"
 	"strings"
+	"time"
 
 	"github.com/Dreamacro/clash/adapter/outboundgroup"
 	"github.com/Dreamacro/clash/common/structure"
+	clashHttp "github.com/Dreamacro/clash/component/http"
 )
 
+func downloadForBytes(url string) ([]byte, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*90)
+	defer cancel()
+	resp, err := clashHttp.HttpRequest(ctx, url, http.MethodGet, http.Header{"User-Agent": {"clash"}}, nil)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	return io.ReadAll(resp.Body)
+}
+
+func saveFile(bytes []byte, path string) error {
+	return os.WriteFile(path, bytes, 0o644)
+}
+
 func trimArr(arr []string) (r []string) {
 	for _, e := range arr {
 		r = append(r, strings.Trim(e, " "))