OAuth2 in NestJS for social login (Google, Facebook, Twitter, etc) /2

jwt-auth.guard.ts

import { Injectable } from '@nestjs/common';
import { AuthGuard } from '@nestjs/passport';

@Injectable()
export class JwtAuthGuard extends AuthGuard('jwt') {}

jwt-auth.module.ts

import { Module } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import { JwtModule } from '@nestjs/jwt';
import { JwtAuthService } from './jwt-auth.service';
import { JwtAuthStrategy } from './jwt-auth.strategy';

@Module({
  imports: [
    JwtModule.registerAsync({
      useFactory: async (configService: ConfigService) => {
        return {
          secret: configService.get<string>('JWT_SECRET'),
          signOptions: {
            expiresIn: configService.get<string>('JWT_EXPIRES_IN'),
          },
        };
      },
      inject: [ConfigService],
    }),
  ],
  providers: [JwtAuthStrategy, JwtAuthService],
  exports: [JwtModule, JwtAuthService],
})
export class JwtAuthModule {}

jwt-auth.service.ts

import { Injectable } from '@nestjs/common';
import { JwtService } from '@nestjs/jwt';
import { JwtPayload } from './jwt-auth.strategy';

@Injectable()
export class JwtAuthService {
  constructor(private jwtService: JwtService) {}

  login(user) {
    const payload: JwtPayload = { username: user.username, sub: user.id };
    return {
      accessToken: this.jwtService.sign(payload),
    };
  }
}

jwt-auth.strategy.ts

import { ExtractJwt, Strategy } from 'passport-jwt';
import { PassportStrategy } from '@nestjs/passport';
import { Injectable } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';

export type JwtPayload = { sub: number; username: string };

@Injectable()
export class JwtAuthStrategy extends PassportStrategy(Strategy) {
  constructor(configService: ConfigService) {
    const extractJwtFromCookie = (req) => {
      let token = null;

      if (req && req.cookies) {
        token = req.cookies['jwt'];
      }
      return token;
    };

    super({
      jwtFromRequest: extractJwtFromCookie,
      ignoreExpiration: false,
      secretOrKey: configService.get<string>('JWT_SECRET'),
    });
  }

  async validate(payload: JwtPayload) {
    return { id: payload.sub, username: payload.username };
  }
}