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<?php

//laravel

namespace App\Helpers;

use App\Repositories\UserRepository;
use Auth;
use Response;

class AuthHelper {

    /**
     * @var \App\Repositories\UserRepository
     */
    private $userRepository;

    public function __construct(
        UserRepository $userRepository
    ) {

        $this->userRepository = $userRepository;
    }

    /**
     * Authenticate user from the wordpress site
     *
     * @param string $login
     * @param string $password
     * @return \Illuminate\Http\Response
     */
    public function checkInWpAndAuthorize($login, $password) {

        require(base_path() . env('WORDPRESS_PATH') . 'wp-load.php');

        $check = \wp_authenticate_username_password(NULL, $login, $password);

        if (\is_wp_error($check)) {

            return Response::json(['error' => 'Wrong credentials'], 403);
        }

        if (Auth::check()) {

            Auth::logout();
        }

        $user = $this->userRepository
            ->findWhere(['wp_id' => $check->ID])
            ->first();

        if (empty($user)) {

            $user = $this->userRepository->create(
                [],
                [
                    'name' => $login,
                    'email' => $check->user_email,
                    'wp_id' => $check->ID,
                ]
            );
        }

        if ($user->hasRole('admin')) {

            return Response::json(['error' => 'Wrong credentials'], 403);
        }

        Auth::login($user, true);

        return Response::json(['message' => 'User logged']);
    }
}

<?php

namespace App\Http\Middleware;

use Closure;

class CheckExternalCall {

    /**
     * Handle an incoming request and add headers for external call
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @param  string|null  $guard
     * @return mixed
     */
    public function handle($request, Closure $next) {

        if ($request->server('HTTP_ORIGIN') == env('WORDPRESS_URL')) {

            header('Access-Control-Allow-Origin: ' . env('WORDPRESS_URL'));
            header('Access-Control-Allow-Methods: GET, POST, OPTIONS');
            header('Access-Control-Allow-Headers: Origin, Content-Type, Accept, Authorization, X-Request-With, Set-Cookie');
            header('Access-Control-Allow-Credentials: true');
        }

        return $next($request);
    }

}

<?php
add_action( 'user_register', 'create_user_in_laravel_app' );

function create_user_in_laravel_app($user_id) {

    $user = get_user_by('id', $user_id);

    if (!empty($user->get_role_caps()['administrator'])) {

        return;
    }

    require_once get_home_path() . LARAVEL_APP_PATH . '/app/Helpers/WpFunctions.php';
    LrCreateUser($user);
}

add_action( 'delete_user', 'delete_user_in_laravel_app' );

function delete_user_in_laravel_app($user_id) {

    require_once get_home_path() . LARAVEL_APP_PATH . '/app/Helpers/WpFunctions.php';
    LrDeleteUser($user_id);
}

add_action( 'profile_update', 'update_user_in_laravel_app');

function update_user_in_laravel_app($user_id) {

    $user = get_user_by('id', $user_id);

    if (!empty($user->get_role_caps()['administrator'])) {

        return;
    }

    require_once get_home_path() . LARAVEL_APP_PATH . '/app/Helpers/WpFunctions.php';
    LrUpdateUser($user);
}

  var ajaxSended = false;

  //Authorize in laravel app by ajax
  $('.ui-dialog').on('click', '.ui-button[type="submit"]', function(event) {

      if (ajaxSended) {

          ajaxSended = false;
          return true;
      }

      event.preventDefault();
      // Block interface
      $('#ual_div_<?php $ual->form_id(); ?>').block({ message: null });

      var $button = $(this);
      var login = $("#ual_form_<?php $ual->form_id(); ?>").find('[name="ual_username"]').val();
      var password = $("#ual_form_<?php $ual->form_id(); ?>").find('[name="ual_password"]').val();

      $.ajax({
          type: 'POST',
          url: 'http://app.wfresidency.loc/wpLogin',
          //allow some crossdomain xhr headers like as 'Set-Cookie' which need for authorize
          xhrFields: {
              withCredentials: true,
          },
          data: {
              'login': login,
              'password': password,
          },
          success: function(){
              $button.trigger('click');
          },
          error: function(){
              $button.trigger('click');
          }
      });

      ajaxSended = true;
  });
  

<?php
/**
 * File with functions called in the wordpress site by including this file
 *
 * Name all functions by prefix "Lr" for clear understanding in the wordpress code
 */

//init laravel

require __DIR__.'/../../bootstrap/autoload.php';
$app = require_once __DIR__.'/../../bootstrap/app.php';
$kernel = $app->make(Illuminate\Contracts\Http\Kernel::class);
$response = $kernel->handle(
    $request = Illuminate\Http\Request::capture()
);

//functions

/**
 * Make new user in laravel app by the WP user
 *
 * @param $user
 */
function LrCreateUser($user) {

    if (empty($user)) {

        return;
    }

    $userRepository = \App::make('App\Repositories\UserRepository');
    $userRepository->create(
        [],
        [
            'name' => $user->get('user_login'),
            'email' => $user->get('user_email'),
            'wp_id' => $user->get('ID'),
        ]
    );
}

/**
 * Delete user by ID in WP
 *
 * @param $userId
 */
function LrDeleteUser($userId) {

    if (empty($userId)) {

        return;
    }

    $userRepository = \App::make('App\Repositories\UserRepository');
    $user = $userRepository->findWhere(['wp_id' => $userId])->first();

    if (empty($user)) {

        return;
    }

    if ($user->hasRole('admin')) {

        return;
    }

    $user->delete();
}

/**
 * Update user in laravel app by the WP user
 *
 * @param $wpUser
 */
function LrUpdateUser($wpUser) {

    if (empty($wpUser)) {

        return;
    }

    $userRepository = \App::make('App\Repositories\UserRepository');
    $lrUser = $userRepository->findWhere(['wp_id' => $wpUser->get('ID')])->first();

    if (empty($lrUser)) {

        return;
    }

    $lrUser->name = $wpUser->get('user_login');
    $lrUser->email = $wpUser->get('user_email');
    $lrUser->save();
}