При попытке авторизоваться через вк появляется ошибка "К сожалению, произошла ошибка при авторизации на сервисе ВКонтакте".

if(!isset($_REQUEST['backurl']) && isset($_REQUEST['amp;backurl'])){ $_REQUEST['backurl'] = $_REQUEST['amp;backurl']; }

<?
IncludeModuleLangFile(__FILE__);

class CSocServVKontakte extends CSocServAuth
{
   const ID = "VKontakte";
   const CONTROLLER_URL = "https://www.bitrix24.ru/controller";

   protected $entityOAuth = NULL;

   public function GetSettings()
   {
      return array(
         array("vkontakte_appid", GetMessage("socserv_vk_id"), "", Array("text", 40)),
         array("vkontakte_appsecret", GetMessage("socserv_vk_key"), "", Array("text", 40)),
         array("note" => GetMessage("socserv_vk_sett_note1", array('#URL#'=>$this->getEntityOAuth()->GetRedirectURI()))),
      );
   }

   public function GetFormHtml($arParams)
   {
      $url = $this->getUrl($arParams);

      $phrase = ($arParams["FOR_INTRANET"]) ? GetMessage("socserv_vk_note_intranet") : GetMessage("socserv_vk_note");
      if ($arParams["FOR_INTRANET"])
         return array("ON_CLICK" => 'oncl ick="BX.util.popup(\'' . htmlspecialcharsbx(CUtil::JSEscape($url)) . '\', 660, 425)"');

      return '<a href="jav * ascript:void(0)" oncl ick="BX.util.popup(\'' . htmlspecialcharsbx(CUtil::JSEscape($url)) . '\', 660, 425)" class="bx-ss-button vkontakte-button"></a><span class="bx-spacer"></span><span>' . $phrase . '</span>';
   }

   public function GetOnClickJs($arParams)
   {
      $url = $this->getUrl($arParams);

      return "BX.util.popup('" . CUtil::JSEscape($url) . "', 660, 425)";
   }

   public function getUrl($arParams)
   {
      global $APPLICATION;

      CSocServAuthManager::SetUniqueKey();
      if (IsModuleInstalled('bitrix24') && defined('BX24_HOST_NAME'))
      {
         $redirect_uri = self::CONTROLLER_URL . "/redirect.php";
         // error, but this code is not working at all
         $state = \CHTTP::URN2URI("/bitrix/tools/oauth/liveid.php") . "?state=";
         $backurl = urlencode($APPLICATION->GetCurPageParam('check_key=' . $_SESSION["UNIQUE_KEY"], array("logout", "auth_service_error", "auth_service_id", "backurl")));
         $state .= urlencode(urlencode("backurl=" . $backurl));
      }
      else
      {
         $backurl = $APPLICATION->GetCurPageParam(
            'check_key=' . $_SESSION["UNIQUE_KEY"],
            array("logout", "auth_service_error", "auth_service_id", "backurl")
         );

         $state = 'site_id=' . SITE_ID . '&backurl=' . urlencode($backurl) . (isset($arParams['BACKURL']) ? '&redirect_url=' . urlencode($arParams['BACKURL']) : '');
         $redirect_uri = $this->getEntityOAuth()->GetRedirectURI();

      }

      return $this->getEntityOAuth()->GetAuthUrl($redirect_uri, $state);
   }

   public function getEntityOAuth($code = false)
   {
      if (!$this->entityOAuth)
      {
         $this->entityOAuth = new CVKontakteOAuthInterface();
      }

      if ($code !== false)
      {
         $this->entityOAuth->setCode($code);
      }

      return $this->entityOAuth;
   }

   public function prepareUser($arVkUser, $short = false)
   {
      $first_name = $last_name = $gender = "";

      if ($arVkUser['response']['0']['first_name'] <> '')
      {
         $first_name = $arVkUser['response']['0']['first_name'];
      }

      if ($arVkUser['response']['0']['last_name'] <> '')
      {
         $last_name = $arVkUser['response']['0']['last_name'];
      }

      if (isset($arVkUser['response']['0']['sex']) && $arVkUser['response']['0']['sex'] != '')
      {
         if ($arVkUser['response']['0']['sex'] == '2')
            $gender = 'M';
         elseif ($arVkUser['response']['0']['sex'] == '1')
            $gender = 'F';
      }

      $arFields = array(
         'EXTERNAL_AUTH_ID' => self::ID,
         'XML_ID' => $arVkUser['response']['0']['id'],
         'LOGIN' => "VKuser" . $arVkUser['response']['0']['id'],
         'EMAIL' => $this->entityOAuth->GetCurrentUserEmail(),
         'NAME' => $first_name,
         'LAST_NAME' => $last_name,
         'PERSONAL_GENDER' => $gender,
         'OATOKEN' => $this->entityOAuth->getToken(),
         'OATOKEN_EXPIRES' => $this->entityOAuth->getAccessTokenExpires(),
      );

      if (isset($arVkUser['response']['0']['photo_max_orig']) && self::CheckPhotoURI($arVkUser['response']['0']['photo_max_orig']))
      {
         if (!$short)
         {
            $arPic = CFile::MakeFileArray($arVkUser['response']['0']['photo_max_orig']);
            if ($arPic)
            {
               $arFields["PERSONAL_PHOTO"] = $arPic;
            }
         }

         if (isset($arVkUser['response']['0']['bdate']))
         {
            if ($date = MakeTimeStamp($arVkUser['response']['0']['bdate'], "DD.MM.YYYY"))
            {
               $arFields["PERSONAL_BIRTHDAY"] = ConvertTimeStamp($date);
            }
         }

         $arFields["PERSONAL_WWW"] = self::getProfileUrl($arVkUser['response']['0']['id']);

         if (SITE_ID <> '')
         {
            $arFields["SITE_ID"] = SITE_ID;
         }
      }

      return $arFields;
   }

   public function Authorize()
   {
      $GLOBALS["APPLICATION"]->RestartBuffer();
      $bSuccess = SOCSERV_AUTHORISATION_ERROR;

      if ((isset($_REQUEST["code"]) && $_REQUEST["code"] <> '') && CSocServAuthManager::CheckUniqueKey())
      {
         if (IsModuleInstalled('bitrix24') && defined('BX24_HOST_NAME'))
            $redirect_uri = self::CONTROLLER_URL . "/redirect.php";
         else
            $redirect_uri = $this->getEntityOAuth()->GetRedirectURI();

         $this->entityOAuth = $this->getEntityOAuth($_REQUEST['code']);
         if ($this->entityOAuth->GetAccessToken($redirect_uri) !== false)
         {
            $arVkUser = $this->entityOAuth->GetCurrentUser();
            if (is_array($arVkUser) && ($arVkUser['response']['0']['id'] <> ''))
            {
               $arFields = $this->prepareUser($arVkUser);
               $bSuccess = $this->AuthorizeUser($arFields);
            }
         }
      }

      $url = ($GLOBALS["APPLICATION"]->GetCurDir() == "/login/") ? "" : $GLOBALS["APPLICATION"]->GetCurDir();
      $aRemove = array("logout", "auth_service_error", "auth_service_id", "code", "error_reason", "error", "error_description", "check_key", "current_fieldset");

if(!isset($_REQUEST['backurl']) && isset($_REQUEST['amp;backurl'])){ $_REQUEST['backurl'] = $_REQUEST['amp;backurl']; }


      if (isset($_REQUEST['backurl']) || isset($_REQUEST['redirect_url']))
      {
         $parseUrl = parse_url(isset($_REQUEST['redirect_url']) ? $_REQUEST['redirect_url'] : $_REQUEST['backurl']);

         $urlPath = $parseUrl["path"];
         $arUrlQuery = explode('&', $parseUrl["query"]);

         foreach ($arUrlQuery as $key => $value)
         {
            foreach ($aRemove as $param)
            {
               if (mb_strpos($value, $param."=") === 0)
               {
                  unset($arUrlQuery[$key]);
                  break;
               }
            }
         }
         $url = (!empty($arUrlQuery)) ? $urlPath . '?' . implode("&", $arUrlQuery) : $urlPath;
      }

      if ($bSuccess === SOCSERV_REGISTRATION_DENY)
      {
         $url = (preg_match("/\?/", $url)) ? $url . '&' : $url . '?';
         $url .= 'auth_service_id=' . self::ID . '&auth_service_error=' . $bSuccess;
      }
      elseif ($bSuccess !== true)
      {
         $url = (isset($urlPath)) ? $urlPath . '?auth_service_id=' . self::ID . '&auth_service_error=' . $bSuccess : $GLOBALS['APPLICATION']->GetCurPageParam(('auth_service_id=' . self::ID . '&auth_service_error=' . $bSuccess), $aRemove);
      }

      if (CModule::IncludeModule("socialnetwork") && mb_strpos($url, "current_fieldset=") === false)
      {
         $url = (preg_match("/\?/", $url)) ? $url . "¤t_fieldset=SOCSERV" : $url . "?current_fieldset=SOCSERV";
      }

      echo '
<sc ript type="text/javascript">
if(window.opener)
{
   window.opener.location = \'' . CUtil::JSEscape($url) . '\';
}
window.close();
</sc ript>
';
      die();
   }

   public function setUser($userId)
   {
      $this->getEntityOAuth()->setUser($userId);
   }

   public function getFriendsList($limit, &$next)
   {
      if (IsModuleInstalled('bitrix24') && defined('BX24_HOST_NAME'))
         $redirect_uri = self::CONTROLLER_URL . "/redirect.php";
      else
         $redirect_uri = $this->getEntityOAuth()->GetRedirectURI();

      $vk = $this->getEntityOAuth();
      if ($vk->GetAccessToken($redirect_uri) !== false)
      {
         $res = $vk->getCurrentUserFriends($limit, $next);
         if (is_array($res) && is_array($res['response']))
         {
            foreach ($res['response'] as $key => $contact)
            {
               $res['response'][$key]['name'] = $contact["first_name"];
               $res['response'][$key]['url'] = "https://vk.com/id" . $contact["id"];
               $res['response'][$key]['picture'] = $contact['photo_200_orig'];
            }

            return $res['response'];
         }
      }

      return false;
   }

   public function sendMessage($uid, $message)
   {
      $vk = $this->getEntityOAuth();

      if (IsModuleInstalled('bitrix24') && defined('BX24_HOST_NAME'))
         $redirect_uri = self::CONTROLLER_URL . "/redirect.php";
      else
         $redirect_uri = $this->getEntityOAuth()->GetRedirectURI();

      if ($vk->GetAccessToken($redirect_uri) !== false)
      {
         $res = $vk->sendMessage($uid, $message);
      }

      return $res;
   }

   public function getProfileUrl($uid)
   {
      return "http://vk.com/id" . $uid;
   }
}

class CVKontakteOAuthInterface extends CSocServOAuthTransport
{
   const SERVICE_ID = "VKontakte";

   // https://vk.com/dev/constant_version_updates
   const AUTH_URL = "https://oauth.vk.com/authorize";
   const TOKEN_URL = "https://oauth.vk.com/access_token";
   const CONTACTS_URL = "https://api.vk.com/method/users.get";
   const FRIENDS_URL = "https://api.vk.com/method/friends.get";
   const MESSAGE_URL = "https://api.vk.com/method/messages.send";
   const APP_URL = "https://api.vk.com/method/apps.get";
   // https://vk.com/dev/versions
   const API_VERSION = "5.21";

   protected $userID = false;
   protected $userEmail = false;

   protected $scope = array(
      "friends",
      "offline",
      "email",
   );

   public function __construct($appID = false, $appSecret = false, $code = false)
   {
      if ($appID === false)
      {
         $appID = trim(CSocServVKontakte::GetOption("vkontakte_appid"));
      }

      if ($appSecret === false)
      {
         $appSecret = trim(CSocServVKontakte::GetOption("vkontakte_appsecret"));
      }

      parent::__construct($appID, $appSecret, $code);
   }

   public function GetRedirectURI()
   {
      return \CHTTP::URN2URI("/bitrix/tools/oauth/vkontakte.php");
   }

   public function GetAuthUrl($redirect_uri, $state = '')
   {
      return self::AUTH_URL .
      "?client_id=" . urlencode($this->appID) .
      "&redirect_uri=" . urlencode($redirect_uri) .
      "&scope=" . $this->getScopeEncode() .
      "&response_type=code" .
      ($state <> '' ? '&state=' . urlencode($state) : '');
   }

   public function GetAccessToken($redirect_uri)
   {
      $token = $this->getStorageTokens();
      if (is_array($token))
      {
         $this->access_token = $token["OATOKEN"];

         return true;
      }

      if ($this->code === false)
      {
         return false;
      }

      $query = array(
         "client_id" => $this->appID,
         "client_secret" => $this->appSecret,
         "code" => $this->code,
         "redirect_uri" => $redirect_uri,
      );

      $h = new \Bitrix\Main\Web\HttpClient(array(
         "socketTimeout" => $this->httpTimeout,
         "streamTimeout" => $this->httpTimeout,
      ));

      $result = $h->post(self::TOKEN_URL, $query);

      try
      {
         $arResult = \Bitrix\Main\Web\Json::decode($result);
      } catch (\Bitrix\Main\ArgumentException $e)
      {
         $arResult = array();
      }

      foreach ($arResult as $key => $value)
      {
         if (mb_strpos($key, 'access_token_') === 0)
         {
            $this->access_token = $value;
            $this->userID = null;
            $this->userEmail = null;

            $_SESSION["OAUTH_DATA"] = array("OATOKEN" => $this->access_token);
            return true;
         }
      }

      if ((isset($arResult["access_token"]) && $arResult["access_token"] <> '') && isset($arResult["user_id"]) && $arResult["user_id"] <> '')
      {
         $this->access_token = $arResult["access_token"];
         $this->userID = $arResult["user_id"];
         $this->userEmail = $arResult["email"];

         $_SESSION["OAUTH_DATA"] = array("OATOKEN" => $this->access_token);

         return true;
      }

      return false;
   }

   public function GetCurrentUser()
   {
      if ($this->access_token === false)
      {
         return false;
      }

      $h = new \Bitrix\Main\Web\HttpClient(array(
         "socketTimeout" => $this->httpTimeout,
         "streamTimeout" => $this->httpTimeout,
      ));


      $result = $h->get(self::CONTACTS_URL . '?v='.self::API_VERSION.'&fields=uid,first_name,last_name,nickname,screen_name,sex,bdate,city,country,timezone,photo,photo_medium,photo_max_orig,photo_rec,email&access_token=' . urlencode($this->access_token));

      try
      {
         $result = \Bitrix\Main\Web\Json::decode($result);
      } catch (\Bitrix\Main\ArgumentException $e)
      {
         $result = array();
      }

      return $result;
   }

   public function GetAppInfo()
   {
      if ($this->access_token === false)
         return false;

      $h = new \Bitrix\Main\Web\HttpClient();
      $h->setTimeout($this->httpTimeout);

      $result = $h->get(self::APP_URL . '?v='.self::API_VERSION.'&fields=id&access_token=' . urlencode($this->access_token));

      try
      {
         $result = \Bitrix\Main\Web\Json::decode($result);
      } catch (\Bitrix\Main\ArgumentException $e)
      {
         $result = array();
      }

      return $result['response']['items'][0];
   }

   public function GetCurrentUserEmail()
   {
      return $this->userEmail;
   }

   public function GetCurrentUserFriends($limit, &$next)
   {
      if ($this->access_token === false)
      {
         return false;
      }

      $url = self::FRIENDS_URL . '?v='.self::API_VERSION.'&uids=' . $this->userID . '&fields=uid,first_name,last_name,nickname,screen_name,photo_200_orig,contacts,email&access_token=' . urlencode($this->access_token);

      if ($limit > 0)
      {
         $url .= "&count=" . intval($limit) . "&offset=" . intval($next);
      }

      $h = new \Bitrix\Main\Web\HttpClient();
      $h->setTimeout($this->httpTimeout);

      $result = $h->get($url);

      try
      {
         $result = \Bitrix\Main\Web\Json::decode($result);
      } catch (\Bitrix\Main\ArgumentException $e)
      {
         $result = array();
      }

      $next = $limit + $next;

      return $result;
   }

   public function sendMessage($uid, $message)
   {
      if ($this->access_token === false)
      {
         return false;
      }

      $url = self::MESSAGE_URL;

      $message = \Bitrix\Main\Text\Encoding::convertEncoding($message, LANG_CHARSET, "utf-8");

      $arPost = array(
         "user_id" => $uid,
         "access_token" => $this->access_token,
         "message" => $message,
      );

      $ob = new \Bitrix\Main\Web\HttpClient();

      return $ob->post($url, $arPost);
   }
}

?>