connect.php

<?php
// fetch bootstrap
require('bootstrap.php');

try {

  switch ($_REQUEST['do']) {
    case 'connect':
      // check if social login enabled
      if (!$system['social_login_enabled']) {
        _error(404);
      }

      // check if user cancelled the connection
      if (isset($_GET['error']) || isset($_GET['denied'])) {
        redirect();
      }

      // check provider
      switch ($_REQUEST['provider']) {
        case 'facebook':
          if (!$system['facebook_login_enabled']) {
            _error(404);
          }
          break;

        case 'google':
          if (!$system['google_login_enabled']) {
            _error(404);
          }
          break;

        case 'twitter':
          if (!$system['twitter_login_enabled']) {
            _error(404);
          }
          break;

        case 'linkedin':
          if (!$system['linkedin_login_enabled']) {
            _error(404);
          }
          break;

        case 'vkontakte':
          if (!$system['vkontakte_login_enabled']) {
            _error(404);
          }
          break;

        default:
          _error(404);
          break;
      }

      // set provider
      $provider = $_REQUEST["provider"];

      // config hybridauth
      $config = array(
        'callback' => $system['system_url'] . "/connect/" . $provider,
        "providers" => array(
          "Facebook" => array(
            "enabled" => true,
            "keys"    => array("id" => $system['facebook_appid'], "secret" => $system['facebook_secret']),
            "scope"   => "email, public_profile",
            "trustForwarded" => false
          ),
          "Google" => array(
            "enabled" => true,
            "keys"    => array("key" => $system['google_appid'], "secret" => $system['google_secret'])
          ),
          "Twitter" => array(
            "enabled" => true,
            "keys"    => array("key" => $system['twitter_appid'], "secret" => $system['twitter_secret']),
            "includeEmail" => true
          ),
          "Instagram" => array(
            "enabled" => true,
            "keys"    => array("id" => $system['instagram_appid'], "secret" => $system['instagram_secret'])
          ),
          "LinkedIn" => array(
            "enabled" => true,
            "keys"    => array("id" => $system['linkedin_appid'], "secret" => $system['linkedin_secret'])
          ),
          "Vkontakte" => array(
            "enabled" => true,
            "keys"    => array("id" => $system['vkontakte_appid'], "secret" => $system['vkontakte_secret'])
          )
        )
      );

      // initialize Hybrid_Auth with a given file
      $hybridauth = new Hybridauth\Hybridauth($config);

      // try to authenticate with the selected provider
      $adapter = $hybridauth->authenticate($provider);

      // then grab the user profile
      $user_profile = $adapter->getUserProfile();

      // socail login
      $user->socail_login($provider, $user_profile);

      // disconnect
      $adapter->disconnect();
      break;

    case 'revoke':
      // user access
      user_access();

      // check provider
      switch ($_REQUEST['provider']) {
        case 'facebook':
          $social_id = "facebook_id";
          $social_connected = "facebook_connected";
          break;

        case 'google':
          $social_id = "google_id";
          $social_connected = "google_connected";
          break;

        case 'twitter':
          $social_id = "twitter_id";
          $social_connected = "twitter_connected";
          break;

        case 'instagram':
          $social_id = "instagram_id";
          $social_connected = "instagram_connected";
          break;

        case 'linkedin':
          $social_id = "linkedin_id";
          $social_connected = "linkedin_connected";
          break;

        case 'vkontakte':
          $social_id = "vkontakte_id";
          $social_connected = "vkontakte_connected";
          break;

        default:
          _error(404);
          break;
      }

      // revoke
      $db->query(sprintf("UPDATE users SET $social_connected = '0', $social_id = NULL WHERE user_id = %s", secure($user->_data['user_id'], 'int'))) or _error("SQL_ERROR_THROWEN");
      redirect('/settings/linked');
      break;

    default:
      _error(404);
      break;
  }
} catch (Exception $e) {
  _error(__("Error"), $e->getMessage());
}