<?php
class Ncr_Comment_Captcha extends Ncr_No_Captcha_Recaptcha
{
/** @var string captcha errors */
private static $captcha_error;
public static function initialize()
{
// initialize if login is activated
if (isset(self::$plugin_options['captcha_comment']) && self::$plugin_options['captcha_comment'] == 'yes') {
// add captcha header script to WordPress header
add_action('wp_head', array(__CLASS__, 'header_script'));
// adds the captcha to the comment form
add_action('comment_form_after_fields', array(__CLASS__, 'display_captcha'));
// authenticate the captcha answer
add_filter('preprocess_comment', array(__CLASS__, 'validate_captcha_comment_field'));
// redirect location for comment
add_filter('comment_post_redirect', array(__CLASS__, 'redirect_fail_captcha_comment'), 10, 2);
}
}
/**
* Add query string to the comment redirect location
*
* @param $location string location to redirect to after comment
* @param $comment object comment object
*
* @return string
*/
public static function redirect_fail_captcha_comment($location, $comment)
{
if (!empty(self::$captcha_error)) {
// delete the failed captcha comment
wp_delete_comment(absint($comment->comment_ID), true);
// add failed query string for @parent::display_captcha to display error message
$location = add_query_arg('captcha', 'failed', $location);
// remove the obnoxious comment string i.e comment-15
$deleted_comment_id = strstr($location, '#');
$location = str_replace($deleted_comment_id, '#comments', $location);
}
return $location;
}
/**
* Verify the captcha answer
*
* @param $commentdata object comment object
*
* @return object
*/
public static function validate_captcha_comment_field($commentdata)
{
if (is_user_logged_in()) return $commentdata;
if (!isset($_POST['g-recaptcha-response']) || !(self::captcha_verification())) {
self::$captcha_error = 'failed';
}
return $commentdata;
}
}
