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<?php

/**

 * @file

 * Protects email addresses using the reCAPTCHA web service.

 */

/**

 * Implements hook_help().

 */

function recaptcha_mailhide_help($path, $arg) {

  $output = '';

  switch ($path) {

    case 'admin/modules#name':

      $output .= t('reCAPTCHA');

      break;

    case 'admin/modules#description':

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

        '</p><h3>' .

        t('Configuration') .

        '</h3><p>' .

        t('Head over to the <a href="@inputformats">input format settings</a> and add the <a href="@url" target="_blank">reCAPTCHA Mailhide</a> input filter to hide posted emails.', array('@inputformats' => url('admin/settings/filter'), '@url' => url('https://www.google.com/recaptcha/mailhide/'))) .

        '</p>';

      break;

  }

  return $output;

}

/**

 * Implements hook_filter_info().

 */

function recaptcha_mailhide_filter_info() {

  $filters['filter_recaptcha_mailhide'] = array(

    'title' => t('reCAPTCHA Mailhide'),

    'description' => _filter_recaptcha_mailhide_tips('', ''),

    'process callback' => '_filter_recaptcha_mailhide',

    'settings callback' => '_filter_recaptcha_mailhide_settings',

    'tips callback' => '_filter_recaptcha_mailhide_tips',

    'cache' => FALSE,

  );

  return $filters;

}

/**

 * Filter callbacks.

 */

function _filter_recaptcha_mailhide($text, $filter, $format) {

  global $_recaptcha_mailhide_public_key, $_recaptcha_mailhide_private_key, $_recaptcha_mailhide_nokey_warn;

  _recaptcha_mailhide_load_library();

  $_recaptcha_mailhide_public_key = $filter->settings['recaptcha_mailhide_public_key'];

  $_recaptcha_mailhide_private_key = $filter->settings['recaptcha_mailhide_private_key'];

  $text = ' ' . $text . ' ';

  $text = preg_replace_callback("!(<p>|<li>|<br\s*/?>|[ \n\r\t\(])([A-Za-z0-9._-]+@[A-Za-z0-9._+-]+\.[A-Za-z]{2,4})([.,?]?)(?=(</p>|</li>|<br\s*/?>|[ \n\r\t\)]))!i", '_recaptcha_replace', $text);

  $text = drupal_substr($text, 1, -1);

  unset($_recaptcha_mailhide_public_key);

  unset($_recaptcha_mailhide_private_key);

  unset($_recaptcha_mailhide_nokey_warn);

  return $text;

}

function _filter_recaptcha_mailhide_settings($form, &$form_state, $filter, $format, $defaults, $filters) {

  _recaptcha_mailhide_load_library();

  $public = isset($filter->settings['recaptcha_mailhide_public_key']) ? $filter->settings['recaptcha_mailhide_public_key'] : '';

  $private = isset($filter->settings['recaptcha_mailhide_private_key']) ? $filter->settings['recaptcha_mailhide_private_key'] : '';

  $settings['recaptcha_mailhide_public_key'] = array(

    '#type' => 'textfield',

    '#title' => t('Public Key'),

    '#default_value' => $public,

    '#maxlength' => 50,

    '#description' => t('Your public Mailhide key obtained from <a href="@url" target="_blank">reCAPTCHA</a>.', array('@url' => 'https://www.google.com/recaptcha/mailhide/apikey')),

    );

  $settings['recaptcha_mailhide_private_key'] = array(

    '#type' => 'textfield',

    '#title' => t('Private Key'),

    '#default_value' => $private,

    '#maxlength' => 50,

    '#description' => t('Your private Mailhide key obtained from <a href="@url" target="_blank">reCAPTCHA</a>.', array('@url' => 'https://www.google.com/recaptcha/mailhide/apikey')),

    );

  return $settings;

}

function _filter_recaptcha_mailhide_tips($filter, $format, $long = FALSE) {

  return t('E-Mail addresses are hidden with <a href="@url" target="_blank">reCAPTCHA Mailhide</a>.', array('@url' => 'https://www.google.com/recaptcha/mailhide/'));

}

/**

 * Private reCAPTCHA function to replace an email regex match

 */

function _recaptcha_replace($match) {

  global $_recaptcha_mailhide_public_key, $_recaptcha_mailhide_private_key, $_recaptcha_mailhide_nokey_warn;

  // recaptchalib will die if we invoke without setting the keys. Fail gracefully in this case.

  if (empty($_recaptcha_mailhide_public_key) || empty($_recaptcha_mailhide_private_key) || !function_exists('mcrypt_encrypt')) {

    if ($_recaptcha_mailhide_nokey_warn != TRUE) {

      if (!function_exists('mcrypt_encrypt')) {

        drupal_set_message(t('Addresses cannot be hidden because Mcrypt is not installed.'), 'error');

      }

      else {

        drupal_set_message(t('Addresses cannot be hidden because the administrator has not set the reCAPTCHA Mailhide keys.'), 'error');

      }

      $_recaptcha_mailhide_nokey_warn = TRUE;

    }

    $email = $match[2];

  }

  else {

    $email = recaptcha_mailhide_html($_recaptcha_mailhide_public_key, $_recaptcha_mailhide_private_key, $match[2]);

  }

  return $match[1] . $email . $match[3];

}

/**

 * Load the recaptcha library.

 */

function _recaptcha_mailhide_load_library() {

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

}