通过Kratos内置HTTP框架(非RPC)mux上传文件

func uploadFile(ctx http.Context) error {
	req := ctx.Request()

	fileName := req.FormValue("name")
	file, handler, err := req.FormFile("file")
	if err != nil {
		return err
	}
	defer file.Close()

	f, err := os.OpenFile(handler.Filename, os.O_WRONLY|os.O_CREATE, 0o666)
	if err != nil {
		return err
	}
	defer f.Close()
	_, _ = io.Copy(f, file)

	return ctx.String(200, "File "+fileName+" Uploaded successfully")
}

func NewHTTPServer(c *conf.Server, greeter *service.GreeterService, logger log.Logger) *http.Server {
	var opts = []http.ServerOption{
		http.Middleware(
			recovery.Recovery(),
		),
	}
	if c.Http.Network != "" {
		opts = append(opts, http.Network(c.Http.Network))
	}
	if c.Http.Addr != "" {
		opts = append(opts, http.Address(c.Http.Addr))
	}
	if c.Http.Timeout != nil {
		opts = append(opts, http.Timeout(c.Http.Timeout.AsDuration()))
	}
	srv := http.NewServer(opts...)

	// 上传文件
	route := srv.Route("/")
	route.POST("/upload", uploadFile) // 路由地址, 上传文件的函数

	v1.RegisterGreeterHTTPServer(srv, greeter)

	return srv
}