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<?php

add_filter('wpcf7_spam', 'wpcf7_akismet', 10, 2);
function wpcf7_akismet($spam, $submission)
{
    if ($spam) {
        return $spam;
    }
    if (!wpcf7_akismet_is_available()) {
        return false;
    }
    if (!($params = wpcf7_akismet_submitted_params())) {
        return false;
    }
    $c = array();
    $c['comment_author'] = $params['author'];
    $c['comment_author_email'] = $params['author_email'];
    $c['comment_author_url'] = $params['author_url'];
    $c['comment_content'] = $params['content'];
    $c['blog'] = get_option('home');
    $c['blog_lang'] = get_locale();
    $c['blog_charset'] = get_option('blog_charset');
    $c['user_ip'] = $_SERVER['REMOTE_ADDR'];
    $c['user_agent'] = $_SERVER['HTTP_USER_AGENT'];
    $c['referrer'] = $_SERVER['HTTP_REFERER'];
    $c['comment_type'] = 'contact-form';
    $datetime = date_create_immutable('@' . $submission->get_meta('timestamp'));
    if ($datetime) {
        $c['comment_date_gmt'] = $datetime->format(DATE_ATOM);
    }
    if ($permalink = get_permalink()) {
        $c['permalink'] = $permalink;
    }
    $ignore = array('HTTP_COOKIE', 'HTTP_COOKIE2', 'PHP_AUTH_PW');
    foreach ($_SERVER as $key => $value) {
        if (!in_array($key, (array) $ignore)) {
            $c["{$key}"] = $value;
        }
    }
    $c = apply_filters('wpcf7_akismet_parameters', $c);
    if (wpcf7_akismet_comment_check($c)) {
        $spam = true;
        $submission->add_spam_log(array('agent' => 'akismet', 'reason' => __("Akismet returns a spam response.", 'contact-form-7')));
    } else {
        $spam = false;
    }
    return $spam;
}
function wpcf7_akismet_is_available()
{
    if (is_callable(array('Akismet', 'get_api_key'))) {
        return (bool) Akismet::get_api_key();
    }
    return false;
}
function wpcf7_akismet_submitted_params()
{
    $params = array('author' => '', 'author_email' => '', 'author_url' => '', 'content' => '');
    $has_akismet_option = false;
    foreach ((array) $_POST as $key => $val) {
        if ('_wpcf7' == substr($key, 0, 6) or '_wpnonce' == $key) {
            continue;
        }
        if (is_array($val)) {
            $val = implode(', ', wpcf7_array_flatten($val));
        }
        $val = trim($val);
        if (0 == strlen($val)) {
            continue;
        }
        if ($tags = wpcf7_scan_form_tags(array('name' => $key))) {
            $tag = $tags[0];
            $akismet = $tag->get_option('akismet', '(author|author_email|author_url)', true);
            if ($akismet) {
                $has_akismet_option = true;
                if ('author' == $akismet) {
                    $params[$akismet] = trim($params[$akismet] . ' ' . $val);
                    continue;
                } elseif ('' == $params[$akismet]) {
                    $params[$akismet] = $val;
                    continue;
                }
            }
        }
        $params['content'] .= "\n\n" . $val;
    }
    if (!$has_akismet_option) {
        return false;
    }
    $params['content'] = trim($params['content']);
    return $params;
}
function wpcf7_akismet_comment_check($comment)
{
    $spam = false;
    $query_string = wpcf7_build_query($comment);
    if (is_callable(array('Akismet', 'http_post'))) {
        $response = Akismet::http_post($query_string, 'comment-check');
    } else {
        return $spam;
    }
    if ('true' == $response[1]) {
        $spam = true;
    }
    if ($submission = WPCF7_Submission::get_instance()) {
        $submission->akismet = array('comment' => $comment, 'spam' => $spam);
    }
    return apply_filters('wpcf7_akismet_comment_check', $spam, $comment);
}