Nest: Custom messages from guards

Created on 8 Oct 2017 · 6Comments · Source: nestjs/nest

I've a guard which returns false if the request doesn't have correct jwt token or has expired jwt token. But I'm not being able to send the message back to notify why the request is 403 forbidden.

here's my code

@Guard()
export class AuthGuard implements CanActivate {

    canActivate(req: Request, context: ExecutionContext): Promise<boolean> {
        return new Promise<boolean>((resolve, reject) => {
            if (req.headers.authorization && req.headers.authorization.toString().split(' ')[0] === 'Bearer') {
                const token: string = req.headers.authorization.toString().split(' ')[1];
                Database.Connection.then((connection: Connection) => {
                    const decoded = jwt.verify(token, 'secret');

                    connection.getRepository(User).findOneById(decoded.data).then((user: User) => {
                        (req as any).user = user;
                        resolve(true);
                    });
                }).catch((err) => {
                    resolve(false);
                });
            } else {
                resolve(false);
            }
        });
    }
}

Source

nmabhinandan

Most helpful comment

@nmabhinandan of course! I see there's no example in the docs. Good point, maybe I should create one :slightly_smiling_face:

kamilmysliwiec on 8 Oct 2017

👍4

All 6 comments

You could take a look at my repo's this is exactly the same problem and a use a middleware and a custom exception to handle and send back to the client