<?php

// If this file is called directly, abort.
if (!defined('WPINC')) {
    die('Damn it.! Dude you are looking for what?');
}

/**
 * The public-facing functionality of the plugin.
 *
 *
 * @link       https://thefoxe.com/products/404-to-301
 * @since      2.0.0
 * @package    I4T3
 * @subpackage I4T3/public
 * @author     Joel James <me@joelsays.com>
 */
class _404_To_301_Public {

    /**
     * The ID of this plugin.
     *
     * @since    2.0.0
     * @access   private
     * @var      string    $plugin_name    The ID of this plugin.
     */
    private $plugin_name;

    /**
     * The version of this plugin.
     *
     * @since    2.0.0
     * @access   private
     * @var      string    $version    The current version of this plugin.
     */
    private $version;

    /**
     * The database table of plugin.
     *
     * @since    2.0.0
     * @access   protected
     * @var      string    $table    The name of the database table from db.
     */
    private $table;

    /**
     * Initialize the class and set its properties.
     *
     * @since    2.0.0
     * @var      string    $plugin_name       The name of the plugin.
     * @var      string    $version    The version of this plugin.
     */
    public function __construct($plugin_name, $version, $table) {

        $this->plugin_name = $plugin_name;
        $this->version = $version;
        $this->table = $table;
        $this->gnrl_options = get_option('i4t3_gnrl_options');
    }

    /**
     * Create the 404 Log Email to be sent.
     *
     * @since    2.0.0
     * @uses     get_option    To get admin email from database.
     * @uses     get_bloginfo   To get site title.
     */
    public function i4t3_send_404_log_email($log_data) {

        // Filter to change the email address used for admin notifications
        $admin_email = apply_filters('i4t3_notify_admin_email_address', get_option('admin_email'));

        // Action hook that will be performed before sending 404 error mail
        do_action('i4t3_before_404_email_log', $log_data);

        // Get the site name
        $site_name = get_bloginfo('name');

        $headers[] = 'From: ' . $site_name . ' <' . $admin_email . '>' . "\r\n";
        $headers[] = 'Content-Type: text/html; charset=UTF-8';
        $message = '<p>' . __('Bummer! You have one more 404', '404-to-301') . '</p>';
        $message .= '<table>';
        $message .= '<tr>';
        $message .= '<th>' . __('IP Address', '404-to-301') . '</th>';
        $message .= '<td>' . $log_data['ip'] . '</td>';
        $message .= '</tr>';
        $message .= '<tr>';
        $message .= '<th>' . __('404 Path', '404-to-301') . '</th>';
        $message .= '<td>' . $log_data['url'] . '</td>';
        $message .= '</tr>';
        $message .= '<tr>';
        $message .= '<th>' . __('User Agent', '404-to-301') . '</th>';
        $message .= '<td>' . $log_data['ua'] . '</td>';
        $message .= '</tr>';
        $message .= '</table>';
        $is_sent = wp_mail(
            $admin_email, __('Snap! One more 404 on ', '404-to-301') . $site_name, $message, $headers
        );
    }

    /**
     * The main function to perform redirections and logs on 404s.
     * Creating log for 404 errors, sending admin notification email if enables,
     * redirecting visitors to the specific page etc. are done in this function.
     *
     * @since    2.0.0
     * @uses     wp_redirect    To redirect to a given link.
     * @uses     do_action   To add new action.
     */
    public function i4t3_redirect_404() {

        // Check if 404 page and not admin side
        if (is_404() && !is_admin() && !$this->i4t3_excluded_paths()) {

            // Get the settings options
            $logging_status = (!empty($this->gnrl_options['redirect_log']) ) ? $this->gnrl_options['redirect_log'] : 0;

            $redirect_type = ( $this->gnrl_options['redirect_type'] ) ? $this->gnrl_options['redirect_type'] : '301';
            // Get the email notification settings
            $is_email_send = (!empty($this->gnrl_options['email_notify']) && $this->gnrl_options['email_notify'] == 1 ) ? true : false;

            // Get error details if emailnotification or log is enabled
            if ($logging_status == 1 || $is_email_send) {

                // Action hook that will be performed before logging 404 errors
                do_action('i4t3_before_404_logging');

                global $wpdb;
                $data = array(
                    'date' => current_time('mysql'),
                    'url' => $this->get_clear_empty($_SERVER['REQUEST_URI'])
                );
                if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
                    $data['ip'] = $this->get_clear_empty($_SERVER['HTTP_CLIENT_IP']);
                } else if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
                    $data['ip'] = $this->get_clear_empty($_SERVER['HTTP_X_FORWARDED_FOR']);
                } else {
                    $data['ip'] = $this->get_clear_empty($_SERVER['REMOTE_ADDR']);
                }
                $data['ref'] = $this->get_clear_empty($_SERVER['HTTP_REFERER']);
                $data['ua'] = $this->get_clear_empty($_SERVER['HTTP_USER_AGENT']);
                // trim stuff
                foreach (array('url', 'ref', 'ua') as $k)
                    if (isset($data[$k]))
                        $data[$k] = substr($data[$k], 0, 512);
            }

            // Add log data to db if log is enabled by user
            if ($logging_status == 1 && !$this->i4t3_is_bot()) {

                $wpdb->insert($this->table, $data);

                // pop old entry if we exceeded the limit
                //$max = intval( $this->options['max_entries'] );
                $max = 500;
                $cutoff = $wpdb->get_var("SELECT id FROM $this->table ORDER BY id DESC LIMIT $max,1");
                if ($cutoff) {
                    $wpdb->delete($this->table, array('id' => intval($cutoff)), array('%d'));
                }
            }

            // Send email notification if enabled
            if ($is_email_send && !$this->i4t3_is_bot()) {
                $this->i4t3_send_404_log_email($data);
            }

            // Get redirect settings
            $redirect_to = $this->gnrl_options['redirect_to'];

            switch ($redirect_to) {
                // Do not redirect if none is set
                case 'none':
                    break;
                // Redirect to an existing WordPress site inside our site
                case 'page':
                    $url = get_permalink($this->gnrl_options['redirect_page']);
                    break;
                // Redirect to a custom link given by user
                case 'link':
                    $naked_url = $this->gnrl_options['redirect_link'];
                    $url = (!preg_match("~^(?:f|ht)tps?://~i", $naked_url)) ? "http://" . $naked_url : $naked_url;
                    break;
                // If nothing, be chill and do nothing!
                default:
                    break;
            }
            do_action('i4t3_before_404_redirect');
            // Perform the redirect if $url is set
            if (!empty($url)) {
                // Action hook that will be performed before 404 redirect starts
                //echo $url; exit();
                wp_redirect($url, $redirect_type);
                exit(); // exit, because WordPress will not exit automatically
            }
        }
    }

    /**
     * Check if Bot is visiting.
     *
     * This function is used to check if a bot is being viewed our site content.
     *
     * @reference http://stackoverflow.com/questions/677419/how-to-detect-search-engine-bots-with-php
     * @since    2.0.5
     * @author	Joel James
     */
    public function i4t3_is_bot() {

        $botlist = array("Teoma", "alexa", "froogle", "Gigabot", "inktomi",
            "looksmart", "URL_Spider_SQL", "Firefly", "NationalDirectory",
            "Ask Jeeves", "TECNOSEEK", "InfoSeek", "WebFindBot", "girafabot",
            "crawler", "www.galaxy.com", "Googlebot", "Scooter", "Slurp",
            "msnbot", "appie", "FAST", "WebBug", "Spade", "ZyBorg", "rabaz",
            "Baiduspider", "Feedfetcher-Google", "TechnoratiSnoop", "Rankivabot",
            "Mediapartners-Google", "Sogou web spider", "WebAlta Crawler", "TweetmemeBot",
            "Butterfly", "Twitturls", "Me.dium", "Twiceler");

        foreach ($botlist as $bot) {
            if (strpos($_SERVER['HTTP_USER_AGENT'], $bot) !== false)
                return true; // Is a bot
        }

        return false; // Not a bot
    }

    /**
     * Exclude specific uri strings/paths from errors
     *
     * @retun 	True if requested uri matches specified one
     * @since    2.0.8
     * @author	Joel James
     */
    public function i4t3_excluded_paths() {

        // Add links to be excluded in this array.
        $links_string = $this->gnrl_options['exclude_paths'];
        if (empty($links_string)) {
            return false;
        }
        $links = explode("\n", $links_string);
        if (!empty($links)) {
            foreach ($links as $link) {
                if (strpos($_SERVER['REQUEST_URI'], trim($link)) !== false)
                    return true;
            }
        }
        return false;
    }

    /**
     * Check if value is empty before trying to insert.
     *
     * @since    2.0.9.1
     * @author	Joel James
     */
    public function get_clear_empty($data = null) {

        return ( $data == null || empty($data) ) ? 'N/A' : $data;
    }

}
' . __('IP Address', '404-to-301') . '	' . $log_data['ip'] . '
' . __('404 Path', '404-to-301') . '	' . $log_data['url'] . '
' . __('User Agent', '404-to-301') . '	' . $log_data['ua'] . '