public function connectOauth2($options)
    {
        $token = false;

        // source oauth provider
        $oauthProvider = $this->getProvider();

        // error
        if(\Craft\craft()->request->getParam('error'))
        {
            throw new \Exception("An error occured: ".\Craft\craft()->request->getParam('error'));
        }

        $state = \Craft\craft()->request->getParam('state');
        $code = \Craft\craft()->request->getParam('code');
        $oauth2state = \Craft\craft()->httpSession->get('oauth2state');

        if (is_null($code))
        {
            $authorizationOptions = $options['authorizationOptions'];

            if(count($options['scope']) > 0)
            {
                $authorizationOptions['scope'] = $options['scope'];
            }

            $authorizationUrl = $oauthProvider->getAuthorizationUrl($authorizationOptions);

            $state = $oauthProvider->getState();

            \Craft\craft()->httpSession->add('oauth2state', $state);

            OauthPlugin::log('OAuth 2.0 Connect - Redirect to the authorization URL'."\r\n".
	            "authorizationUrl: ".$authorizationUrl."\r\n".
	            "oauth2state: ".\Craft\craft()->httpSession->get('oauth2state')
	        , LogLevel::Info);

            \Craft\craft()->request->redirect($authorizationUrl);
        }
        elseif (!$state || $state !== $oauth2state)
        {
            OauthPlugin::log('OAuth 2.0 Connect - Invalid State'."\r\n".print_r([
                'state' => $state,
                'oauth2state' => $oauth2state,
            ], true), LogLevel::Info);

            \Craft\craft()->httpSession->remove('oauth2state');

            throw new \Exception("Invalid state");

        }
        else
        {
            OauthPlugin::log('OAuth 2.0 Connect - Authorization code retrieved: '.$code, LogLevel::Info);

            $token = $oauthProvider->getAccessToken('authorization_code', [
                'code' => $code
            ]);

            OauthPlugin::log("OAuth 2.0 Connect - Get Access Token\r\n".
	            "Access token: \r\n".
	            print_r($token, true)
	        , LogLevel::Info);
        }

        return $token;
    }