AuthService

auth.service.ts

import { AuthConfig } from './auth.config';
import { Inject, Injectable } from '@nestjs/common';
import {
  AuthenticationDetails,
  CognitoUser,
  CognitoUserPool,
} from 'amazon-cognito-identity-js';

@Injectable()
export class AuthService {
  private userPool: CognitoUserPool;
  constructor(
    @Inject('AuthConfig')
    private readonly authConfig: AuthConfig,
  ) {
    this.userPool = new CognitoUserPool({
      UserPoolId: this.authConfig.userPoolId,
      ClientId: this.authConfig.clientId,
    });
  }

  authenticateUser(user: { name: string, password: string}) {
    const { name, password } = user;

    const authenticationDetails = new AuthenticationDetails({
      Username: name,
      Password: password,
    });
    const userData = {
      Username: name,
      Pool: this.userPool,
    };

    const newUser = new CognitoUser(userData);

    return new Promise((resolve, reject) => {
      return newUser.authenticateUser(authenticationDetails, {
        onSuccess: result => {
          resolve(result);
        },
        onFailure: err => {
          reject(err);
        },
      });
    });
  }
}