老师你好，中间件API层里面有很多个接口：

func (e *MiddlewareApi) FindMiddlewareById(ctx context.Context, req *middlewareApi.Request, rsp *middlewareApi.Response) error {}
func (e *MiddlewareApi) AddMiddleware(ctx context.Context, req *middlewareApi.Request, rsp *middlewareApi.Response) error {}
func (e *MiddlewareApi) DeleteMiddlewareById(ctx context.Context, req *middlewareApi.Request, rsp *middlewareApi.Response) error {}
func (e *MiddlewareApi) UpdateMiddleware(ctx context.Context, req *middlewareApi.Request, rsp *middlewareApi.Response) error {}
func (e *MiddlewareApi) FindAllMiddlewareByTypeId(ctx context.Context, req *middlewareApi.Request, rsp *middlewareApi.Response) error {}
func (e *MiddlewareApi) FindMiddleTypeById(ctx context.Context, req *middlewareApi.Request, rsp *middlewareApi.Response) error {}
func (e *MiddlewareApi) AddMiddleType(ctx context.Context, req *middlewareApi.Request, rsp *middlewareApi.Response) error {}
func (e *MiddlewareApi) DeleteMiddleTypeById(ctx context.Context, req *middlewareApi.Request, rsp *middlewareApi.Response) error {}
func (e *MiddlewareApi) UpdateMiddleType(ctx context.Context, req *middlewareApi.Request, rsp *middlewareApi.Response) error {}
func (e *MiddlewareApi) FindAllMiddleType(ctx context.Context, req *middlewareApi.Request, rsp *middlewareApi.Response) error {}

这里面有中间件添加、还有中间件类型添加，中间件类型课程中案例是提供四种中间件类型的服务。
所以，

func (e *MiddlewareApi) AddMiddleType(ctx context.Context, req *middlewareApi.Request, rsp *middlewareApi.Response) error {}
func (e *MiddlewareApi) UpdateMiddleType(ctx context.Context, req *middlewareApi.Request, rsp *middlewareApi.Response) error {}
func (e *MiddlewareApi) DeleteMiddleTypeById(ctx context.Context, req *middlewareApi.Request, rsp *middlewareApi.Response) error {}

这三个接口是暴露出去了吗，也就是用户能调用？提供的中间件类型不应该是paas平台决定的吗？万一用户调用了把中间件类型都给删了呢？这么设计是不是不合理