php - Getting Facebook session on Wordpress -

background

we have wordpress site requires special kind of facebook authentication. wp site needs authenticate user different app, , log user app. web app built us, , has api wp site uses interact it. before rowdy, whole authentication process works using normal login form. using api, can see user or not logged app, , display on wp site.

problem

as stated, need facebook authentication. using facebooks php sdk v4 , have built custom plugin keep code seperate theme. when user clicks on fb icon, shows popup correct redirect url. after while, popup closes, there nothing in result. few placed var_dumps reveal i'm not getting facebookredirectloginhelper. means can't session in turns means no user info.

code

as stated, i've created plugin (ns-social.php) handles everything. here file:

/**  * plugin name: ns social plugin  */  require_once 'ns-social-init.php'; require_once 'ns-callback-functions.php'; require_once 'ns-facebook.php' ;  $fb = null; add_action('plugins_loaded','load_fb');  function load_fb() {     global $fb;     $fb = new wp_facebook(); }  /**  * social login check  */  function get_fb_url() {     global $fb;     return $fb->login_url(); } 

ns-social-init.php starts session fb can use:

/**  * functions required during initialisation of wordpress or plugin  */ add_action('plugins_loaded', 'start_session');  function start_session() {     if (!session_id()) {         session_start();     } } 

ns-callback-functions.php contains callback functions redirects. these shortcodes placed in pages, url www.site.com/facebook-callback , page have [facebook-callback] in handle request.

add_shortcode('facebook_callback', 'facebook_callback'); function facebook_callback() {     global $fb;     if (isset($_get['error'])) {         if ($_get['error'] == 'access_denied') {             echo "<script>                 if(window.opener != null) {                     window.close();                 }             </script>";             exit;         }     }     $session = $fb->get_session();     $userarr = $fb->get_user();     $user['name']     = $userarr['first_name'];     $user['surname']  = $userarr['last_name'];     $user['email']    = $userarr['email'];     $user['verified'] = $userarr['verified'];     $_session['registeruser'] = $user;     $_session['registertype'] = 'facebook';     $action = "";     die(var_dump($_session,true));     if (user_exists($user['email'])) {         $action = '?login';     }     wp_redirect(home_url('social-register/' . $action)); } 

and last not least, ns-facebook.php file:

use facebook\facebookredirectloginhelper; use facebook\facebooksession; use facebook\facebookrequest;  class wp_facebook {     var $helper;     var $session;     var $permissions;     var $loginurl;      public function __construct()     {         // initialize sdk         facebooksession::setdefaultapplication('0appid145', '00hahaitsmysecret23523');         $this->permissions = ['public_profile', 'email'];         $this->helper = new facebookredirectloginhelper(home_url('facebook-callback'));         $this->loginurl = $this->helper->getloginurl($this->permissions);     }      /**      * returns login url.      *      * @return string      */     public function login_url()     {         return $this->loginurl;     }      /**      * returns current user's info array.      */     public function get_user($session = null)     {         if(empty($session)) $session = $this->session;         if($session) {             /**              * retrieve user's profile information              */             // graph api request user data             $request = new facebookrequest($session, 'get', '/me');             $response = $request->execute();              // response array             $user = $response->getgraphobject()->asarray();              return $user;         }          return false;     }      public function get_session() {         try {             $this->session = $this->helper->getsessionfromredirect();         } catch(facebookrequestexception $ex) {             // when facebook returns error         } catch(\exception $ex) {             // when validation fails or other local issues         }         if ($this->session) {             return $this->session;         }     } } 

what have tried

i've gone through quite few questions on so. have noticed is, when first run page, fbrlh_state in session is, abcdef example. when response after clicking login button, fbrlh_state xyz. don't know if has effect on outcome. if could, how use state? don't set it, i'm assuming fb sdk does.

tl;dr

fb php sdk v4 not sending when use facebookredirectloginhelper. why this, , how fix it?

did make test offical facebookredirectloginhelper official github? have used facebook sdk couple of times , never had problem missing returns.