@next-nest-auth/nestauth/src/nestauth-jwt.guard.ts

NestAuth is an authentication solution for NestJS applications, designed to handle user login, session management, and token-based authentication (JWT). It integrates seamlessly with Next.js and other frontends to provide a unified authentication system,

import {
  ExecutionContext,
  Injectable,
  UnauthorizedException,
} from "@nestjs/common";
import { AuthGuard } from "@nestjs/passport";
import * as macaddress from "macaddress";

@Injectable()
export class NestAuthJwtGuard extends AuthGuard("jwt") {
  // ✅ Custom error handling here
  handleRequest(err: any, user: any, info: any, context: ExecutionContext) {
    // console.log("err, user, info, context1");
    if (err || !user) {
      throw new UnauthorizedException("Unauthorized: Invalid or missing token");
    }
    return user;
  }

  // ✅ Make sure to return the result of `super.canActivate`
  async canActivate(context: ExecutionContext): Promise<boolean> {
    const can = (await super.canActivate(context)) as boolean;
    if (!can) return false; // short-circuit if base guard fails

    const request = context.switchToHttp().getRequest();
    const user = request.user;

    if (!user) {
      throw new UnauthorizedException("Unauthorized: Invalid token");
    }

    const currentMacId = await macaddress.one();
    if (user.macId !== currentMacId) {
      throw new UnauthorizedException("Unauthorized: Device mismatch");
    }

    return true;
  }
}