mall-app/src/app/services/auth.service.ts

import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { URL } from '../mocks/url';

@Injectable({
  providedIn: 'root'
})
export class AuthService {

    constructor(
        private http: HttpClient
    ) { }

    authenticateUser(credentials: { username: string, password: string, login_type: string }) {
        return this.http.post(URL + '/api/auth/signin', credentials).toPromise();
    }
}