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<?php
    require_once __DIR__.'/google-api-php-client-2.1.1/vendor/autoload.php';
    date_default_timezone_set('asia/kolkata');
    session_start();

    // to find localhost and production server https
    if ($_SERVER['SERVER_NAME'] == "localhost") {
        $protocol = "http://";
    }else{
        $protocol = "https://";
    }
    $redirect_uri = $protocol . $_SERVER['HTTP_HOST'] . "/index.php";
    $client = new Google_Client();
    $client->setAuthConfigFile('key.json');
    $client->setRedirectUri($protocol . $_SERVER['HTTP_HOST'] . "/index.php");
    $client->setScopes('email'); // You want to retrieve email and domain name
    

// on logout
    if (isset($_REQUEST['logout'])) {
      unset($_SESSION['id_token_token']);
    }

// once you get code after auth success
    if (isset($_GET['code'])) {
      $token = $client->fetchAccessTokenWithAuthCode($_GET['code']);
      $client->setAccessToken($token);
      $_SESSION['id_token_token'] = $token;
      header('Location: ' . filter_var($redirect_uri, FILTER_SANITIZE_URL));
    }
    if ( !empty($_SESSION['id_token_token']) && isset($_SESSION['id_token_token']['id_token']) ) {
      $client->setAccessToken($_SESSION['id_token_token']);
    } else {
      $authUrl = $client->createAuthUrl();
    }
    // success
    if ($client->getAccessToken()) {
      $token_data = $client->verifyIdToken();

// print all the data related after auth
      print_r($token_data)
    }
?>