OAuth2 Controller Zend

oauth2_zend.php

<?php

class AdminController extends Zend_Controller_Action
{

    public function init()
    {
        $this->_googleConfig = Zend_Registry::get('google');
        $this->_model = new Application_Model_Manager();
    }

    public function indexAction()
    {
        $this->_redirect('/manager');
    }

    public function loginAction()
    {
        $url = $this->_googleConfig->oauth2_url . '/auth';
        $params = array(
            'client_id'     => $this->_googleConfig->client_id,
            'redirect_uri'  => $this->view->serverUrl() . '/admin/callback',
            'response_type' => 'code',
            'scope'         => $this->_googleConfig->scope
        );
        $this->_redirect($url . '?' . http_build_query($params));
    }

    public function callbackAction()
    {
        $url = $this->_googleConfig->oauth2_url . '/token';
        $params = array(
            'code'          => $_GET['code'],
            'client_id'     => $this->_googleConfig->client_id,
            'client_secret' => $this->_googleConfig->client_secret,
            'redirect_uri'  => $this->view->serverUrl() . '/admin/callback',
            'grant_type'    => 'authorization_code'
        );

        $client = new Zend_Http_Client($url);
        $client->setMethod(Zend_Http_Client::POST);
        $client->setParameterPost($params);
        $accessToken = null;

        try {
            $response = $client->request();
            $decoded = Zend_Json::decode($response->getBody());

            if(is_array($decoded) && array_key_exists('access_token', $decoded)) {
                $accessToken = $decoded['access_token'];
            }
        } catch (Exception $exception) {
            $handler = new Application_Model_CustomErrorHandler($exception->getMessage());
            $handler->save();
        }

        $url = $this->_googleConfig->api_url . '/userinfo';
        $params = array(
            'access_token' => $accessToken
        );
        
        $client = new Zend_Http_Client($url);
        $client->setMethod(Zend_Http_Client::GET);
        $client->setParameterGet($params);
        $email = null;

        try {
            $response = $client->request();
            $decoded = Zend_Json::decode($response->getBody());

            if(is_array($decoded) && array_key_exists('email', $decoded)) {
                $email = $decoded['email'];
            }
        } catch(Exception $exception) {
            $handler = new Application_Model_CustomErrorHandler($exception->getMessage());
            $handler->save();
        }

        if(($manager = $this->_model->findByEmail($email)) instanceof Zend_Db_Table_Row) {
            $managerSession = new Zend_Session_Namespace('manager');
            $managerSession->email = $manager->email;
            $this->_redirect('/admin');
        }

        $this->_redirect('/');
    }

    public function logoutAction()
    {
        $managerSession = new Zend_Session_Namespace('manager');
        $managerSession->email = null;
        $this->_redirect('/');
    }
}