package storage

import (
	"crypto/rand"
	"encoding/hex"
	"strings"
)

func randomHex(n int) string {
	b := make([]byte, n)
	_, _ = rand.Read(b)
	return hex.EncodeToString(b)
}

// NormalizePublicBase 去掉末尾斜杠
func NormalizePublicBase(base string) string {
	return strings.TrimRight(strings.TrimSpace(base), "/")
}

// IsAllowedObjectURL 判断 url 是否属于当前存储公网前缀
func IsAllowedObjectURL(publicBase, url string) bool {
	base := NormalizePublicBase(publicBase)
	if base == "" || url == "" {
		return false
	}
	return strings.HasPrefix(url, base+"/") || url == base
}