Nestjs - how to get session in middleware - node.js

Question

im trying to add graphql to nestjs app. I use postgraphile for the graphql server.
everything works, but i don't know how to protect the '/graphql' endpoint.
the login is done via session, through the nestjs app.
on the needed endpoints (in the existed nestjs app) there is a Session guard which works fine.
i want to add the same behavior to the graphql endpoint.
this is the graphql code:
export const graphqlBootstrap = async (app: INestApplication) => {
app.use(cors());
// what i want to achieve
app.use('/graphql', (req, res, next) => {
if (!req.session.user) res.send('Authetication Error`);
next();
})
app.use(
postgraphile(...)
and the nestjs code the init it:
const bootstrap = async () => {
const { app, start } = await createApplication(TearupsApplicationModule);
app.useGlobalInterceptors(new ApiResponseInterceptor());
configureHiddenFileUploadEndpoint(app.getHttpAdapter());
await Promise.all(app.get(INITIATION_SEQUENCE).map((fn) => fn()));
await graphqlBootstrap(app); // <--
await start();
app.get(EventsEmitter).init(app);
};
is it possible to use the session in a middleware?
I don't know how to reach the ExecutionContext that exist in the Guard.
I read in the docs that there is also ArgumentsHost which might hold the session, but i also don't know how to get it in simple middleware(app.use(...))
Edit 1
i tried to add a middleware to the app module, with forRoutes call.
but the middleware isn't called with the graphql route /graphql.
also, when using route: / - there is no session on the request.
middleware:
export function Logger(req: any, res: Response, next: NextFunction) {
if (req.session) console.log(`Request...`, req.session.user);
next();
}
App Module:
export class MyApp implements NestModule {
configure(consumer: MiddlewareConsumer) {
consumer.apply(Logger).forRoutes('/');
}
Edit 2
tried this now, still didn't work:
export class MyApp implements NestModule {
configure(consumer: MiddlewareConsumer) {
consumer
.apply(logger)
.forRoutes({ path: 'api/tearups/graphql', method: RequestMethod.ALL });
}
}

Answer 1

Write a functional middleware as follow signature:
import { Request, Response, NextFunction } from 'express';
export function Logger(req: Request, res: Response, next: NextFunction) {
console.log(`Request...`, req.session.user);
next();
};
Or, a class-based middleware as:
#Injectable()
export class Logger implements NestMiddleware {
use(req: Request, res: Response, next: NextFunction) {
console.log('Request...', req.session.user);
next();
}
}
Now apply the middleware as follows:
export class AppModule implements NestModule {
configure(consumer: MiddlewareConsumer) {
consumer
.apply(Logger)
.forRoutes(CatsController);
}
}