anti-spam.php

<?php
/*
Plugin Name: Anti-spam Reloaded
Plugin URI: http://wordpress.org/plugins/anti-spam-reloaded/
Description: No spam in comments. No captcha.
Version: 6.5
Author: kudlav, webvitaly
Text Domain: anti-spam-reloaded
Author URI: https://kudlav.github.io/
License: GPLv3
*/

if ( ! defined( 'ABSPATH' ) ) { // Avoid direct calls to this file and prevent full path disclosure
	exit;
}

define('ANTISPAMREL_PLUGIN_VERSION', '6.4');

include('anti-spam-functions.php');
include('anti-spam-settings.php');
include('anti-spam-info.php');

function antispamrel_load_plugin_textdomain() {
	load_plugin_textdomain('anti-spam-reloaded', false, basename(dirname(__FILE__)) . '/languages/');
}
add_action('plugins_loaded', 'antispamrel_load_plugin_textdomain');

function antispamrel_enqueue_script() {
	global $withcomments; // WP flag to show comments on all pages
	if ((is_singular() || $withcomments) && comments_open()) { // load script only for pages with comments form
		wp_enqueue_script(
			'anti-spam-reloaded-script',
			plugins_url('/js/anti-spam.min.js', __FILE__),
			null,
			ANTISPAMREL_PLUGIN_VERSION,
			true
		);
	}
}
add_action('wp_enqueue_scripts', 'antispamrel_enqueue_script');


function antispamrel_form_part() {
	if ( ! is_user_logged_in()) { // add anti-spam fields only for not logged in users
		printf( '
			<!-- Anti-spam Reloaded plugin wordpress.org/plugins/anti-spam-reloaded/ -->
			<p class="antispamrel-group" style="clear: both;">
				<label>' . /*translators:1:invisible text will be inserted here*/
					esc_html__('Current ye%s@r', 'anti-spam-reloaded') .
					'<span class="required">*</span>
					<input type="text" name="antspmrl-q" class="antispamrel-control-q" value="' . rand(0, 99) . '" autocomplete="off" />
				</label>
				<input type="hidden" name="antspmrl-a" class="antispamrel-control-a" value="' . date('Y') . '" />
			</p>
			<p class="antispamrel-group" style="display: none;">
				<label>' . esc_html__('Leave this field empty', 'anti-spam-reloaded') . '</label>
				<input type="text" name="antspmrl-e-email-url-website" class="antispamrel-control-e" value="" autocomplete="off" />
			</p>
		', '<span style="display: none;">ignore me</span>');
		// empty field (hidden with css): trap for spammers because many bots will try to put email or url here
	}
}
add_action('comment_form', 'antispamrel_form_part'); // add anti-spam inputs to the comment form


function antispamrel_check_comment($commentdata) {
	$antispam_settings = antispamrel_get_settings();

	$flag = null;

	switch ($commentdata['comment_type']) {
		case '': // legacy comment WP<5.5
		case 'comment':
			if(!is_user_logged_in() && antispamrel_check_for_spam()) // logged in user is not a spammer
				$flag = __('Comment is a spam.', 'anti-spam-reloaded');
			break;
		case 'trackback':
			$flag = __('Trackbacks are disabled.', 'anti-spam-reloaded');
	}

	if ($flag !== null) {
		if( $antispam_settings['save_spam_comments'] ) {
			antispamrel_store_comment($commentdata);
		}
		antispamrel_counter_stats();
		wp_die($flag); // die - do not send comment and show error message
	}

	return $commentdata; // if comment does not looks like spam
}
if ( ! is_admin()) { // without this check it is not possible to add comment in admin section
	add_filter('preprocess_comment', 'antispamrel_check_comment', 1);
}


function antispamrel_plugin_meta($links, $file) { // add some links to plugin meta row
	if ( $file == plugin_basename( __FILE__ ) ) {
		$row_meta = array(
			'github' => '<a href="https://github.com/kudlav/anti-spam/" target="_blank" rel="noreferrer">GitHub</a>'
		);
		$links = array_merge( $links, $row_meta );
	}
	return (array) $links;
}
add_filter('plugin_row_meta', 'antispamrel_plugin_meta', 10, 2);