upload

var (
	// UploadURLPath 上传文件网址访问路径
	UploadURLPath = defaultUploadURLPath

	// UploadDir 定义上传目录（首尾必须带“/”）
	UploadDir = defaultUploadDir

	// AllowedExtensions 被允许上传的文件的扩展名
	AllowedExtensions = []string{
		`.jpeg`, `.jpg`, `.gif`, `.png`, `.mp4`,
	}
)

var (
	ErrUnsupportedExtension = errors.New("不支持的文件扩展名")
	ErrIncorrectPath        = errors.New("路径不合法")
)

var IsRightUploadFile = func(ctx echo.Context, src string) error {
	src = echo.CleanPath(src)
	ext := strings.ToLower(path.Ext(src))
	cfg := Get()
	if !com.InSlice(ext, cfg.AllowedExtensions) {
		return errors.WithMessage(ErrUnsupportedExtension, ext)
	}
	if !strings.HasPrefix(src, UploadURLPath) {
		return ErrIncorrectPath
	}
	return nil
}

var ReplacePlaceholder = func(s string, repl func(string) string) string {
	return placeholderRegexp.ReplaceAllStringFunc(s, func(find string) string {
		id := find[9 : len(find)-1]
		return repl(id)
	})
}