agregando modulo general para la auth

import { Module } from '@nestjs/common';

import { JwtService } from '@nestjs/jwt';

import { AuthService } from './auth.service';

@Module({

  controllers: [],

  providers: [JwtService, AuthService],

  imports: [],

  exports: [AuthService],

})

export class AuthModule {}

import { Injectable, UnauthorizedException } from '@nestjs/common';

import { JwtService } from '@nestjs/jwt';

import { JwtConstants } from 'src/constants/jwt.constants';

import { PayloadJwtDto } from 'src/shared/dto/payload-jwt.dto';

@Injectable()

export class AuthService {

  constructor(private jwtService: JwtService) {}

  async validateToken(token: string): Promise<string | null> {

    try {

      const payload: PayloadJwtDto = await this.jwtService.verify(token, { secret: JwtConstants.SECRET });

      return payload.role;

    } catch (error) {

      throw new UnauthorizedException('Invalid token');

    }

  }

}