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   $returnUrl = "https://" . $_SERVER['HTTP_HOST'] . url('shib_login') . $_SERVER['REQUEST_URI'];
   $sessioninitiator = shib_auth_get_redirect_base(shib_auth_config('full_handler_url'));
   $sep="?";
   if (preg_match('/\?/', $sessioninitiator)) {
    $sep='&';
  }
    $forceauthn = '';
  //append forceAuthN variable to the login string
  if (shib_auth_config('forceauthn')) {
    $forceauthn = '&forceAuthn=1';
  }
   $login_url = check_url($sessioninitiator . $sep . "target=" . urlencode($returnUrl) . $forceauthn);
   //print $login_url;
   print l(t('Sign-in with your CERN NICE account'),  $login_url, array('attributes' => array('title' => t('Sign in to your CERN account'), 'class' => 'cern-account')));
?>