Club Drupal

 * Uses the reCAPTCHA web service to improve the CAPTCHA system.

  $output = '';

    case 'admin/modules#name':

      $output .= t('reCAPTCHA');

      break;

    case 'admin/modules#description':

    case 'admin/user/captcha/recaptcha':

      $output .= t('Uses the <a href="@url" target="_blank">reCAPTCHA</a> web service to improve the CAPTCHA system and protect email addresses.', array('@url' => url('https://www.google.com/recaptcha')));

      break;

    case 'admin/help#recaptcha':

      $output .= '<p>' .

        t('Uses the reCAPTCHA web service to improve the CAPTCHA module and protect email addresses. For more information on what reCAPTCHA is, visit <a href="@url" target="_blank">the official website</a>.', array('@url' => url('https://www.google.com/recaptcha'))) .

        '</p><h3>' .

        t('Configuration') .

        '</h3><p>' .

        t('The settings associated with reCAPTCHA can be found in the <a href="@recaptchatab">reCAPTCHA tab</a>, in the <a href="@captchasettings">CAPTCHA settings</a>. You must set your public and private reCAPTCHA keys in order to use the module. Once the public and private keys are set, visit the <a href="@captchasettings">CAPTCHA settings</a>, where you can choose where reCAPTCHA should be displayed.', array('@recaptchatab' => url('admin/user/captcha/recaptcha'), '@captchasettings' => url('admin/user/captcha'))) .

        '</p>';

      break;

  return $output;

  $items = array();

    'description' => 'Administer the reCAPTCHA web service.',

      'title' => t('reCaptcha Administration'),

      'description' => t('Administer reCaptcha settings'),

        // Retrieve configuration variables.

        $recaptcha_theme = variable_get('recaptcha_theme', 'red');

        $recaptcha_tabindex = variable_get('recaptcha_tabindex', NULL);

        $recaptcha_public_key = variable_get('recaptcha_public_key', FALSE);

        $recaptcha_ajax_api = variable_get('recaptcha_ajax_api', FALSE);

        // Test if reCAPTCHA can be used, falling back to Math if it is not

        // configured, the library won't load, or the server is down.

        if (!$recaptcha_public_key || !_recaptcha_load_library() || !_recaptcha_server_is_up()) {

          return captcha_captcha('generate', 'Math');

        }

        if ($recaptcha_ajax_api) {

          // By default CAPTCHA turns off page caching on any page where a

          // CAPTCHA challenge appears. If recaptcha is using AJAX API, set

          // caching back to its old state as stored in DB.

          global $conf;

          $conf['cache'] = unserialize(db_query("SELECT value FROM {variable} WHERE name = 'cache'")->fetchField());

        }

        $recaptcha_options = array(

          'theme' => $recaptcha_theme,

        );

        // Localization support.

        global $language;

        if (isset($language->language)) {

          // reCAPTCHA uses two-character language codes, so 'pt-br' must be

          // passed as 'pt'.

          $recaptcha_options['lang'] = drupal_substr($language->language, 0, 2);

        }

        // Construct the Javascript, but only display it once.

        static $_recaptcha_jsadded = FALSE;

        if ($_recaptcha_jsadded == FALSE && $recaptcha_ajax_api == FALSE) {

          $_recaptcha_jsadded = TRUE;

          // Add support to display the custom theme.

          if ($recaptcha_theme == 'custom') {

            $recaptcha_options['custom_theme_widget'] = 'recaptcha_custom_theme_widget';

          }

          // Set the default tab index.

          if (!empty($recaptcha_tabindex)) {

            $recaptcha_options['tabindex'] = $recaptcha_tabindex;

          drupal_add_js('var RecaptchaOptions = ' . drupal_json_encode($recaptcha_options) . ';', array('type' => 'inline'));

        }

        // Create the form. Captcha requires TRUE to be returned in solution.

        $captcha['solution'] = TRUE;

        $captcha['captcha_validate'] = 'recaptcha_captcha_validation';

        // If 'Disable Client-Side Cookies' is set, then add query string to

        // end of the public key string before passing to recaptchalib.

        if (variable_get('recaptcha_nocookies', FALSE)) {

          $recaptcha_public_key .= '&nocookie=1';

        }

        $captcha['form']['captcha_response'] = array(

          '#type' => 'hidden',

          '#value' => 'reCAPTCHA',

        );

        // Expose the form, either straight HTML, or using the AJAX API.

        // Build the custom theme HTML if necessary.

        $recaptcha_custom_html = ($recaptcha_theme == 'custom') ? theme('recaptcha_custom_widget') : '';

        if ($recaptcha_ajax_api == FALSE) {

          // Only generate recaptcha_get_html() if we're not using the AJAX API.

          $html = recaptcha_get_html($recaptcha_public_key, NULL, TRUE);

          $captcha['form']['captcha_form'] = array(

            '#type' => 'item',

            '#markup' => (!empty($recaptcha_custom_html) ? '<div id="recaptcha_custom_theme_widget">' . $recaptcha_custom_html . '</div>' : '') . $html,

          $captcha['form']['captcha_form'] = array(

            '#type' => 'item',

            // Create the destination container, inserting any custom theme HTML

            // necessary ($recaptcha_custom_html will be empty if we are not

            // using custom theme).

            '#markup' => '<div id="recaptcha_ajax_api_container">' . $recaptcha_custom_html . '</div>',

          );

          drupal_add_js('https://www.google.com/recaptcha/api/js/recaptcha_ajax.js', array('type' => 'external'));

          $recaptcha_options['public_key'] = $recaptcha_public_key;

          $recaptcha_options['container'] = 'recaptcha_ajax_api_container';

          drupal_add_js(array('recaptcha' => $recaptcha_options), 'setting');

          drupal_add_js(drupal_get_path('module', 'recaptcha') . '/recaptcha.js');

 * Test whether the reCAPTCHA server is up.

 *

 * @return bool

 *   TRUE if the reCAPTCHA server is up, FALSE otherwise.

function _recaptcha_test_recaptcha_server() {

  $response = drupal_http_request('https://' . RECAPTCHA_VERIFY_SERVER);

  if (empty($response->error)) {

    return TRUE;

  }

  else {

    watchdog('reCAPTCHA', 'Unable to connect with the reCAPTCHA server (@server): @errno: @errstr', array(

      '@server' => RECAPTCHA_VERIFY_SERVER,

      '@errno' => $response->code,

      '@errstr' => $response->error,

    ), WATCHDOG_ERROR);

}

/**

 * Return the cached output of _recaptcha_test_recaptcha_server().

 *

 * @return bool

 *   TRUE if the reCAPTCHA server was up last time it was checked, FALSE

 *   otherwise.

 */

function _recaptcha_server_is_up() {

  static $server_status;

  // Use static cache value, if available.

  if (isset($server_status)) {

    return $server_status;

  }

  // Check if the status is cached already.

  $status_cache = cache_get('recaptcha_server_status');

  if ($status_cache !== FALSE) {

    $server_status = (bool) $status_cache;

    return $server_status;

  }

  // Status is not cached. Check if server is up.

  $server_status = _recaptcha_test_recaptcha_server();

  // Set to 5 minutes, if interval is not set.

  $cache_period = variable_get('recaptcha_server_status_check_interval', 5);

  // Save it as integer as cache_get returns FALSE, if not found.

  cache_set('recaptcha_server_status', (int) $server_status, 'cache', time() + ($cache_period * 60));

  return $server_status;

}

/**

 * CAPTCHA Callback; Validates the reCAPTCHA code.

 */

function recaptcha_captcha_validation($solution = NULL, $response = NULL) {

  global $user;

  $recaptcha_private_key = variable_get('recaptcha_private_key', FALSE);

  $ip_address = ip_address();

  if ($recaptcha_private_key && $ip_address && $response === 'reCAPTCHA' && !empty($_POST['recaptcha_challenge_field']) && !empty($_POST['recaptcha_response_field']) && _recaptcha_server_is_up()) {

    $resp = recaptcha_check_answer(

      $recaptcha_private_key,

      $ip_address,

      check_plain($_POST['recaptcha_challenge_field']),

      check_plain($_POST['recaptcha_response_field'])

    return $resp->is_valid;

 * Implements hook_theme().

 */

function recaptcha_theme() {

  return array(

    'recaptcha_custom_widget' => array(

      'arguments' => array(),

    ),

  );

}

/**

 * Theme function: creates the custom themed recaptcha widget.

 * @ingroup themeable

 */

function theme_recaptcha_custom_widget() {

  $recaptcha_only_if_incorrect_sol = t('Incorrect please try again');

  $recaptcha_only_if_image_enter = t('Enter the words above:');

  $recaptcha_only_if_audio_enter = t('Enter the words you hear:');

  $recaptcha_get_another_captcha = t('Get another CAPTCHA');

  $recaptcha_only_if_image = t('Get an audio CAPTCHA');

  $recaptcha_only_if_audio = t('Get an image CAPTCHA');

  $help = t('Help');

  return <<<EOT

    <div id="recaptcha_image"></div>

    <div class="recaptcha_only_if_incorrect_sol" style="color:red">$recaptcha_only_if_incorrect_sol</div>

    <span class="recaptcha_only_if_image">$recaptcha_only_if_image_enter</span>

    <span class="recaptcha_only_if_audio">$recaptcha_only_if_audio_enter</span>

    <input type="text" id="recaptcha_response_field" name="recaptcha_response_field" />

    <div class="recaptcha_get_another_captcha"><a href="javascript:Recaptcha.reload()">$recaptcha_get_another_captcha</a></div>

    <div class="recaptcha_only_if_image"><a href="javascript:Recaptcha.switch_type('audio')">$recaptcha_only_if_image</a></div>

    <div class="recaptcha_only_if_audio"><a href="javascript:Recaptcha.switch_type('image')">$recaptcha_only_if_audio</a></div>

    <div class="recaptcha_help"><a href="javascript:Recaptcha.showhelp()">$help</a></div>

EOT;

}

/**

 * Load the recaptcha library.

function _recaptcha_load_library() {

  return module_load_include('php', 'recaptcha', 'recaptcha-php-1.11/recaptchalib');