Why nestjs service is not injected into passport strategy?

Question

I'm trying to make application using nestjs

Dependency injection into controller works well so far.

But when I inject service into passport strategy, injecting is not working.

I want to inject authService into googleStrategy.

This is my module code.

auth.modules.ts

@Module({
  imports: [
    UsersModules,
    PassportModule,
  ],
  controllers: [AuthController],
  providers: [AuthService, GoogleStrategy],
})
export class AuthModules {}

google.strategy.ts

@Injectable()
export class GoogleStrategy extends PassportStrategy(Strategy, 'google') {
  constructor(private authService: AuthService) {
    super({ /*...*/ });
    console.log(this.authService) //undefined
  }
}

In this case, AuthService is not injected.

When I inject AuthService manually using @Inject decorator, AuthService injected successfully.

constructor(@Inject('AuthService') private authService: AuthService) {
  super({ /*...*/ });
  console.log(this.authService) // AuthService is injected
}

Why service is not injected into passport strategy?

Answer 1

i think that you want to do something like this

import { PassportStrategy } from '@nestjs/passport';
import { ExtractJwt, Strategy } from 'passport-jwt';
import { config } from 'dotenv';
import { UserService } from 'src/user/user.service';
import { Injectable } from '@nestjs/common';
config();
@Injectable()
export class JwtStrategy extends PassportStrategy(Strategy, 'jwt') {
  constructor(private readonly UserSerive: UserService) {
    super({
      jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
      ignoreExpiration: false,
      secretOrKey: process.env.jwt_secret,
    });
  }

  async validate(payload: any) {
    return {
      user: payload.sub,
      username: payload.username,
      id: payload.id,
      roles: (await this.UserSerive.findOne(payload.id)).roles,
    };
  }
}