common-passport.decorator.ts

import { createParamDecorator, ExecutionContext, SetMetadata } from '@nestjs/common';

export const Passport = createParamDecorator((data: unknown, ctx: ExecutionContext) => {
  const req = ctx.switchToHttp().getRequest();
  const logIn = <U>(user: U): Promise<U> => new Promise(
    (resolve, reject) => req.logIn(user, err => err ? reject(err) : resolve(user))
  );
  return { logIn };
})

nest-passport-cb.ts

import { Controller, Get, UseGuards, Request, UseInterceptors } from '@nestjs/common';
import { SSOAuthGuard } from './sso-auth.guard';
import { AuthService } from './auth.service';
import { LoginInterceptor } from './login.interceptor';
import { User } from '../common/user.decorator';

@Controller('auth')
export class AuthController {
  constructor(
    private readonly auth: AuthService
  ) {
    console.log('AuthController created');
  }
  @Get('login')
  @UseGuards(SSOAuthGuard)
  login() {
    return
  }

  @Get('callback')
  @UseGuards(SSOAuthGuard)
  callback(@User() user: any, @Passport() passport: any) {
    return passport.logIn(user);
  }
}