wp-comments-post.php

<?php
    /**
     * Handles Comment Post to WordPress and prevents duplicate comment posting.
     *
     * @package WordPress
     */
    if('POST' !== $_SERVER['REQUEST_METHOD'])
    {
        $protocol = $_SERVER['SERVER_PROTOCOL'];
        if(! in_array($protocol, ['HTTP/1.1', 'HTTP/2', 'HTTP/2.0', 'HTTP/3'], true))
        {
            $protocol = 'HTTP/1.0';
        }
        header('Allow: POST');
        header("$protocol 405 Method Not Allowed");
        header('Content-Type: text/plain');
        exit;
    }
    /** Sets up the WordPress Environment. */
    require __DIR__.'/wp-load.php';
    nocache_headers();
    $comment = wp_handle_comment_submission(wp_unslash($_POST));
    if(is_wp_error($comment))
    {
        $data = (int) $comment->get_error_data();
        if(! empty($data))
        {
            wp_die('<p>'.$comment->get_error_message().'</p>', __('Comment Submission Failure'), [
                'response' => $data,
                'back_link' => true,
            ]);
        }
        else
        {
            exit;
        }
    }
    $user = wp_get_current_user();
    $cookies_consent = (isset($_POST['wp-comment-cookies-consent']));
    /**
     * Fires after comment cookies are set.
     *
     * @param WP_Comment $comment         Comment object.
     * @param WP_User    $user            Comment author's user object. The user may not exist.
     * @param bool       $cookies_consent Comment author's consent to store cookies.
     *
     * @since 4.9.6 The `$cookies_consent` parameter was added.
     *
     * @since 3.4.0
     */
    do_action('set_comment_cookies', $comment, $user, $cookies_consent);
    $location = empty($_POST['redirect_to']) ? get_comment_link($comment) : $_POST['redirect_to'].'#comment-'.$comment->comment_ID;
// If user didn't consent to cookies, add specific query arguments to display the awaiting moderation message.
    if(! $cookies_consent && 'unapproved' === wp_get_comment_status($comment) && ! empty($comment->comment_author_email))
    {
        $location = add_query_arg([
                                      'unapproved' => $comment->comment_ID,
                                      'moderation-hash' => wp_hash($comment->comment_date_gmt),
                                  ], $location);
    }
    /**
     * Filters the location URI to send the commenter after posting.
     *
     * @param string     $location The 'redirect_to' URI sent via $_POST.
     * @param WP_Comment $comment  Comment object.
     *
     * @since 2.0.5
     *
     */
    $location = apply_filters('comment_post_redirect', $location, $comment);
    wp_safe_redirect($location);
    exit;