<?php

/**
 * @package     Joomla.Plugin
 * @subpackage  Apiauthentication.basic
 *
 * @copyright   (C) 2019 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\Plugin\ApiAuthentication\Basic\Extension;

use Joomla\CMS\Authentication\Authentication;
use Joomla\CMS\Plugin\CMSPlugin;
use Joomla\CMS\User\UserFactoryInterface;
use Joomla\CMS\User\UserHelper;
use Joomla\Database\DatabaseAwareTrait;
use Joomla\Event\DispatcherInterface;

/**
 * Joomla Authentication plugin
 *
 * @since  4.0.0
 */
final class Basic extends CMSPlugin
{
    use DatabaseAwareTrait;

    /**
     * The user factory
     *
     * @var    UserFactoryInterface
     * @since  4.2.0
     */
    private $userFactory;

    /**
     * Constructor.
     *
     * @param   DispatcherInterface   $dispatcher   The dispatcher
     * @param   array                 $config       An optional associative array of configuration settings
     * @param   UserFactoryInterface  $userFactory  The user factory
     *
     * @since   4.2.0
     */
    public function __construct(DispatcherInterface $dispatcher, array $config, UserFactoryInterface $userFactory)
    {
        parent::__construct($dispatcher, $config);

        $this->userFactory = $userFactory;
    }

    /**
     * This method should handle any authentication and report back to the subject
     *
     * @param   array   $credentials  Array holding the user credentials
     * @param   array   $options      Array of extra options
     * @param   object  &$response    Authentication response object
     *
     * @return  void
     *
     * @since   4.0.0
     */
    public function onUserAuthenticate($credentials, $options, &$response)
    {
        $response->type = 'Basic';

        $username = $this->getApplication()->input->server->get('PHP_AUTH_USER', '', 'USERNAME');
        $password = $this->getApplication()->input->server->get('PHP_AUTH_PW', '', 'RAW');

        if ($password === '') {
            $response->status        = Authentication::STATUS_FAILURE;
            $response->error_message = $this->getApplication()->getLanguage()->_('JGLOBAL_AUTH_EMPTY_PASS_NOT_ALLOWED');

            return;
        }

        $db    = $this->getDatabase();
        $query = $db->getQuery(true)
            ->select($db->quoteName(['id', 'password']))
            ->from($db->quoteName('#__users'))
            ->where($db->quoteName('username') . ' = :username')
            ->bind(':username', $username);

        $db->setQuery($query);
        $result = $db->loadObject();

        if ($result) {
            $match = UserHelper::verifyPassword($password, $result->password, $result->id);

            if ($match === true) {
                // Bring this in line with the rest of the system
                $user               = $this->userFactory->loadUserById($result->id);
                $response->email    = $user->email;
                $response->fullname = $user->name;
                $response->username = $username;

                if ($this->getApplication()->isClient('administrator')) {
                    $response->language = $user->getParam('admin_language');
                } else {
                    $response->language = $user->getParam('language');
                }

                $response->status        = Authentication::STATUS_SUCCESS;
                $response->error_message = '';
            } else {
                // Invalid password
                $response->status        = Authentication::STATUS_FAILURE;
                $response->error_message = $this->getApplication()->getLanguage()->_('JGLOBAL_AUTH_INVALID_PASS');
            }
        } else {
            // Let's hash the entered password even if we don't have a matching user for some extra response time
            // By doing so, we mitigate side channel user enumeration attacks
            UserHelper::hashPassword($password);

            // Invalid user
            $response->status        = Authentication::STATUS_FAILURE;
            $response->error_message = $this->getApplication()->getLanguage()->_('JGLOBAL_AUTH_NO_USER');
        }
    }
}