webform_authcode.module

<?php

/**
 * @file
 * Webform authcode module functions.
 */

/**
 * Implements hook_form_BASE_FORM_ID_alter().
 */
function webform_authcode_form_webform_configure_form_alter(&$form, &$form_state, $form_id) {

  form_load_include($form_state, 'inc', 'webform_authcode', 'includes/webform_authcode.admin');

  // Retrieve the stored pass phrases from the variable store.
  $authcode_phrases = variable_get('authtcode_pass_phrases', array());

  // Retrieve the pass phrase for this webform.
  $authcode_phrase = isset($authcode_phrases[$form['#node']->nid]) ? $authcode_phrases[$form['#node']->nid] : NULL;

  // Add Authorization field to the webform.
  $form['submission']['authcode_protect'] = array(
    '#type' => 'checkbox',
    '#title' => t('Protect this form'),
    '#description' => t('Do you want to protect this form with an authorization code?'),
    '#default_value' => isset($authcode_phrase),
  );
  // If authcode is selected, display the textfield.
  $form['submission']['authcode_pass_phrase'] = array(
    '#type' => 'textfield',
    '#title' => t('Pass phrase'),
    '#description' => t('Enter the pass phrase to get access to this webform.'),
    '#default_value' => check_plain($authcode_phrase),
    '#states' => array(
      'visible' => array(
        ':input[name="authcode_protect"]' => array('checked' => TRUE),
      ),
    ),
  );

  // Add a validation handler.
  $form['#validate'][] = 'webform_authcode_webform_configure_validate';


  // Add a submit handler.
  $form['#submit'][] = 'webform_authcode_webform_configure_submit';
}

/**
 * Implements hook_node_view_alter().
 */
function webform_authcode_node_view_alter(&$build) {

  // Include functions for frontend.
  module_load_include('inc', 'webform_authcode', 'includes/webform_authcode.pages');

  // Retrieve the stored pass phrases from the variable store.
  $authcode_phrases = variable_get('authtcode_pass_phrases', array());

  // Retrieve the node id.
  $nid = $build['#node']->nid;

  // Build the cookie name.
  $cookie_name = 'Drupal_visitor_webform_authcode_' . $nid;

  // Check if a pass phrase has been set for this webform.
  if (isset($authcode_phrases[$build['#node']->nid])) {

    // Check if a pass phrase for this webform has been stored in a cookie.
    if (isset($_COOKIE[$cookie_name]) && $_COOKIE[$cookie_name] == $authcode_phrases[$nid]) {
      return;
    }

    // Retrieve the pass phrase form.
    $pass_phrase_form = drupal_get_form('webform_authcode_pass_phrase_form');
    // Disable the body and webform.
    $build['body']['#access'] = FALSE;
    $build['webform']['#form'] = $pass_phrase_form;
  }

}