bpfaas service auth middleware in bpframework.

$3

https://github.com/bpfaas/middleware

$3

#### Setup.

``js

// to use debugAdminServiceUrl
(global as any)__debugFeignClient = true

import { Application } from 'bpframework';
import * as middleware_auth from '@bpfaas/middleware-auth';

Application.use(middleware_auth.middleware('http://debugAdminServiceUrl'))
Application.runKoa(...);
`

#### Config.

`properties
spring:
application: xxxxxxxxx # 服务名字

service_sign:
faas_service_sign: xxxxxxxxx # 服务签名
``