WordPress/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, array( 'HTTP/1.1', 'HTTP/2', 'HTTP/2.0' ) ) ) {
		$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( dirname( __FILE__ ) . '/wp-load.php' );

nocache_headers();

$comment = wp_handle_comment_submission( wp_unslash( $_POST ) );
if ( is_wp_error( $comment ) ) {
	$data = intval( $comment->get_error_data() );
	if ( ! empty( $data ) ) {
		wp_die(
			'<p>' . $comment->get_error_message() . '</p>', __( 'Comment Submission Failure' ), array(
				'response'  => $data,
				'back_link' => true,
			)
		);
	} else {
		exit;
	}
}

$user = wp_get_current_user();

/**
 * Perform other actions when comment cookies are set.
 *
 * @since 3.4.0
 *
 * @param WP_Comment $comment Comment object.
 * @param WP_User    $user    User object. The user may not exist.
 */
do_action( 'set_comment_cookies', $comment, $user );

$location = empty( $_POST['redirect_to'] ) ? get_comment_link( $comment ) : $_POST['redirect_to'] . '#comment-' . $comment->comment_ID;

/**
 * Filters the location URI to send the commenter after posting.
 *
 * @since 2.0.5
 *
 * @param string     $location The 'redirect_to' URI sent via $_POST.
 * @param WP_Comment $comment  Comment object.
 */
$location = apply_filters( 'comment_post_redirect', $location, $comment );

wp_safe_redirect( $location );
exit;