helper

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

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

	// FileTypeIcon 文件类型icon
	FileTypeIcon = upload.FileTypeIcon

	// DetectFileType 根据文件扩展名判断文件类型
	DetectFileType = upload.DetectType

	// TypeRegister 注册文件扩展名
	TypeRegister = upload.TypeRegister
)

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 = path.Clean(src)
	ext := strings.ToLower(path.Ext(src))
	if !com.InSlice(ext, AllowedUploadFileExtensions) {
		return errors.WithMessage(ErrIncorrectPath, ext)
	}
	if !strings.HasPrefix(src, UploadURLPath) {
		return ErrIncorrectPath
	}
	return nil
}

var ParseAnyFileName = func(s string) []string {
	files := anyFileRegexp.FindAllString(s, -1)
	return files
}

var ParsePersistentFileName = func(s string) []string {
	files := persistentFileRegexp.FindAllString(s, -1)
	return files
}

var ParseTemporaryFileName = func(s string) []string {
	files := temporaryFileRegexp.FindAllString(s, -1)
	return files
}

var ReplaceAnyFileName = func(s string, repl func(string) string) string {
	return anyFileRegexp.ReplaceAllStringFunc(s, repl)
}

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)
	})
}