koa session middleware in bpframework.

$3

https://github.com/bpcloud/middleware

$3

use koa-session

Setup.

``js
import { Application } from 'bpframework';
import * as middleware_session from '@bpframework/middleware-koa-session';

let cfg = {
keys: ['secure keys']
};

Application.use(middleware_session.middleware(cfg))
Application.runKoa(...);
`

Add global types declare

`js
import { Session } from '@bpframework/middleware-koa-session';

declare module 'bpframework' {
export interface RestRequest {
session: Session;
}
}
`

Use in RestController.

`js
@RequestMapping({
path: '/test',
method: RequestMethod.GET,
})
async test(
@RestObject restObj: RestObjectTypeRest // or RestObjectType
): Promise {

// session is new.
if (this.session.isNew) {
// user has not logged in
} else {
// user has already logged in
}

// set session value.
restObj.request.session.a = 1;

// get session value.
console.log(restObj.request.session.a);

// destroy session.
restObj.request.session.destroy();

...
}
``