Nestjs how to pass data from AuthGuard to controller - node.js

Question

I have two microservices one for authentication and another for users. I can log in and get a token, and i can use protected routes only when logged in. However I want to use the userId which i get in the AuthGuard's canActivate function, but i cant reach it in the controller. What is the best way to do it?
My auth guard:
import { CanActivate, ExecutionContext, Inject, Logger } from '#nestjs/common';
import { ClientProxy } from '#nestjs/microservices';
export class JwtAuthGuard implements CanActivate {
constructor(
#Inject('AUTH_CLIENT')
private readonly client: ClientProxy,
) {}
async canActivate(context: ExecutionContext): Promise<boolean> {
const req = context.switchToHttp().getRequest();
try {
const res = await this.client
.send(
{ role: 'auth', cmd: 'check' },
{ jwt: req.headers['authorization']?.split(' ')[1] },
)
.toPromise<boolean>();
return res;
} catch (err) {
Logger.error(err);
return false;
}
}
}
The controller:
#UseGuards(JwtAuthGuard)
#Get('greet')
async greet(#Request() req): Promise<string> {
return 'AUTHENTICATED!' + req;
}
The response:
AUTHENTICATED![object Object]

Answer 1

Attach the userId that you get in the AuthGuard to the req object and then you can access it in the controller:
// after fetching the auth user in the AuthGuard, attach its ID like this
req.userId = authUser.id
And in the controller, you can access it like this:
#UseGuards(JwtAuthGuard)
#Get('greet')
async greet(#Request() req): Promise<string> {
return 'AUTHENTICATED USER ID!' + req.userId;
}