Gmail Oauth with Zend

function process()
{
        // these need to be grabbed from database
        $THREE_LEGGED_CONSUMER_KEY = 'www.mysite.com';
        $THREE_LEGGED_SIGNATURE_METHOD = 'HMAC-SHA1';
        $THREE_LEGGED_CONSUMER_SECRET_HMAC = 'mysecret';

        $THREE_LEGGED_SCOPES = array('https://mail.google.com/');

        ini_set('include_path', ini_get('include_path') . PATH_SEPARATOR . APPPATH . 'libraries');

        require_once 'Zend/Oauth/Consumer.php';
        require_once 'Zend/Crypt/Rsa/Key/Private.php';
        require_once 'Zend/Mail/Protocol/Imap.php';
        require_once 'Zend/Mail/Storage/Imap.php';

        /* need a better way of setting this, but that will come in once I setup login system */

        $options = array(
            'requestScheme' => Zend_Oauth::REQUEST_SCHEME_HEADER,
            'version' => '1.0',
            'consumerKey' => $THREE_LEGGED_CONSUMER_KEY,
            'callbackUrl' => $this->_getCurrentUrl(),
            'requestTokenUrl' => 'https://www.google.com/accounts/OAuthGetRequestToken',
            'userAuthorizationUrl' => 'https://www.google.com/accounts/OAuthAuthorizeToken',
            'accessTokenUrl' => 'https://www.google.com/accounts/OAuthGetAccessToken'
        );

        $options['signatureMethod'] = 'HMAC-SHA1';
        $options['consumerSecret'] = $THREE_LEGGED_CONSUMER_SECRET_HMAC;


        /* might need to rewrite this as $this->zend->Zend_Oauth_Consumer($options) */

        $consumer = new Zend_Oauth_Consumer($options);

        /**
         * When using HMAC-SHA1, you need to persist the request token in some way.
         * This is because you'll need the request token's token secret when upgrading
         * to an access token later on. The example below saves the token object
         * as a session variable.
         */
        if (($this->session->userdata('ACCESS_TOKEN') == null)) {
          if (($this->session->userdata('REQUEST_TOKEN') == null)) {
            // Get Request Token and redirect to Google
            $this->session->set_userdata('REQUEST_TOKEN', serialize($consumer->getRequestToken(array('scope' => implode(' ', $THREE_LEGGED_SCOPES)))));
            $consumer->redirect();
          } else {
            // Have Request Token already, Get Access Token
           $this->session->set_userdata('ACCESS_TOKEN',$consumer->getAccessToken($_GET, unserialize($this->session->userdata('REQUEST_TOKEN'))));
          if($this->philadelity->store_access_token(serialize($this->session->userdata('ACCESS_TOKEN'),$this->tank_auth->get_user_id()))) {
                $this->session->set_flashdata('flash-confirm','Successfully authenticated');
                $this->session->unset_userdata('oauth_email');
                redirect(current_url());
            } else {
                $this->session->set_flashdata('flash-error','Failed to authenticate');
                $this->session->unset_userdata('ACCESS_TOKEN');
                $this->session->unset_userdata('REQUEST_TOKEN');
                redirect('/mail/add');
            }

          }
        } else {
              if($this->session->userdata('ACCESS_TOKEN') !== null) {
                $this->session->set_flashdata('flash-confirm','Successfully authenticated');
                redirect('/mail/view');
              } else {
                $this->session->set_flashdata('flash-error','Failed to authenticate');
                $this->session->unset_userdata('ACCESS_TOKEN');
                $this->session->unset_userdata('REQUEST_TOKEN');
                redirect('/mail/add');
              }
        }
}