iflrandevu/application/controllers/Login.php

<?php defined('BASEPATH') or exit('No direct script access allowed');

/* ----------------------------------------------------------------------------
 * Easy!Appointments - Open Source Web Scheduler
 *
 * @package     EasyAppointments
 * @author      A.Tselegidis <alextselegidis@gmail.com>
 * @copyright   Copyright (c) 2013 - 2020, Alex Tselegidis
 * @license     https://opensource.org/licenses/GPL-3.0 - GPLv3
 * @link        https://easyappointments.org
 * @since       v1.5.0
 * ---------------------------------------------------------------------------- */

/**
 * Login controller.
 *
 * Handles the login page functionality. 
 *
 * @package Controllers
 */
class Login extends EA_Controller {
    /**
     * Login constructor.
     */
    public function __construct()
    {
        parent::__construct();

        $this->load->library('accounts');
        $this->load->library('email_messages');

        script_vars([
            'dest_url' => session('dest_url', site_url('backend')),
        ]);
    }

    /**
     * Render the login page. 
     */
    public function index()
    {
        html_vars([
            'base_url' => config('base_url'),
            'dest_url' => session('dest_url', site_url('backend')),
            'company_name' => setting('company_name')
        ]);
        
        $this->load->view('pages/login', html_vars());
    }

    /**
     * Validate the provided credentials and start a new session if the validation was successful. 
     */
    public function validate()
    {
        try
        {
            $username = request('username');

            if (empty($username))
            {
                throw new InvalidArgumentException('No username value provided.');
            }

            $password = request('password');

            if (empty($password))
            {
                throw new InvalidArgumentException('No password value provided.');
            }

            $user_data = $this->accounts->check_login($username, $password);

            if (empty($user_data))
            {
                throw new InvalidArgumentException('Invalid credentials provided, please try again.');
            }

            session($user_data); // Save data in the session.

            json_response([
                'success' => TRUE,
            ]);
        }
        catch (Throwable $e)
        {
            json_exception($e);
        }
    }
}