Remove Comment Author IPs

remove-comment-ips.php

<?php
/**
 * Plugin Name: Remove Comment Author IPs
 * Version: 0.1.0
 * Description: Removes the IP addresses of comment authors on a scheduled time.
 * Author: Dominik Schilling
 * Author URI: http://wphelper.de/
 * Plugin URI: https://gist.github.com/1836266
 *
 * License: GPLv2 or later
 *
 *	Copyright (C) 2011-2012 Dominik Schilling
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version 2
 *	of the License, or (at your option) any later version.
 *
 *	This program is distributed in the hope that it will be useful,
 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *	GNU General Public License for more details.
 *
 *	You should have received a copy of the GNU General Public License
 *	along with this program; if not, write to the Free Software
 *	Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

/**
 * Don't call this file directly.
 */
if ( ! class_exists( 'WP' ) ) {
	die();
}

class Remove_Comment_IPs {
	/**
	 * Define the days how long IP addresses should be saved.
	 * If the time has passed, the addresses will be removed.
	 *
	 * @var integer
	 */
	private static $days = 3;

	/**
	 * Init.
	 *
	 * @since  0.1.0
	 *
	 * @return void
	 */
	public static function init() {
		// Init the action which will be fired if the scheduled time has passed.
		add_action( 'remove_comment_ips_event', array(
			__CLASS__,
			'do_remove_comment_ips'
		) );
	}

	/**
	 * Clear the IP address from the comment row.
	 *
	 * @since  0.1.0
	 *
	 * @return int  Number of deleted IP addresses
	 */
	public static function do_remove_comment_ips() {
		global $wpdb;

		$query = $wpdb->prepare(
			"UPDATE $wpdb->comments SET `comment_author_IP` = '' WHERE `comment_author_IP` != '' AND `comment_date_gmt` < SUBDATE( NOW(), %d )",
			self::$days
		);

		return $wpdb->query( $query );
	}

	/**
	 * Init the cron job on plugin activation.
	 * Note: Will also fire the cron job.
	 *
	 * @since  0.1.0
	 *
	 * @return void
	 */
	public static function on_activation() {
		wp_schedule_event( time(), 'daily', 'remove_comment_ips_event' );
	}

	/**
	 * Delete the cronjob entry on plugin deactivation.
	 *
	 * @since  0.1.0
	 *
	 * @return void
	 */
	public static function on_deactivation() {
		wp_clear_scheduled_hook( 'remove_comment_ips_event' );
	}
}

// Init the plugin.
add_action( 'plugins_loaded', array( 'Remove_Comment_IPs', 'init' ) );

// Register (de)activation hooks to handle schedule event actions.
register_activation_hook( __FILE__, array(
	'Remove_Comment_IPs',
	'on_activation'
) );

register_deactivation_hook( __FILE__, array(
	'Remove_Comment_IPs',
	'on_deactivation'
) );