public function handleProviderCallback($provider)
 {
     if (!in_array($provider, $this->providers, true)) {
         abort(404);
     }
     $try = Socialize::driver($provider)->user();
     if ($try->getEmail()) {
         $user = User::whereEmail($try->getEmail())->first();
     } else {
         $user = User::whereIdentifier($try->getId())->first();
     }
     if (!$user) {
         $user = User::create(['name' => $try->getName(), 'email' => $try->getEmail(), 'identifier' => $try->getId()]);
     }
     Auth::login($user);
     return response()->redirectToIntended();
 }