Yoast SEO

<?php
/**
 * @package Admin
 */

if ( ! defined( 'WPSEO_VERSION' ) ) {
    header( 'Status: 403 Forbidden' );
    header( 'HTTP/1.1 403 Forbidden' );
    exit();
}

if ( ! class_exists( 'Yoast_Tracking' ) ) {
    /**
     * Class that creates the tracking functionality for WP SEO, as the core class might be used in more plugins,
     * it's checked for existence first.
     *
     * NOTE: this functionality is opt-in. Disabling the tracking in the settings or saying no when asked will cause
     * this file to not even be loaded.
     *
     * @todo [JRF => testers] check if tracking still works if an old version of the Yoast Tracking class was loaded
     * (i.e. another plugin loaded their version first)
     */
    class Yoast_Tracking {

        /**
         * @var object  Instance of this class
         */
        public static $instance;


        /**
         * Class constructor
         */
        function __construct() {
            // Constructor is called from WP SEO
            if ( current_filter( 'yoast_tracking' ) ) {
                $this->tracking();
            }
            // Backward compatibility - constructor is called from other Yoast plugin
            elseif ( ! has_action( 'yoast_tracking', array( $this, 'tracking' ) ) ) {
                add_action( 'yoast_tracking', array( $this, 'tracking' ) );
            }
        }

        /**
         * Get the singleton instance of this class
         *
         * @return object
         */
        public static function get_instance() {
            if ( ! ( self::$instance instanceof self ) ) {
                self::$instance = new self();
            }
            return self::$instance;
        }

        /**
         * Main tracking function.
         */
        function tracking() {

            $data = get_transient( 'yoast_tracking_cache' );

            // bail if transient is set and valid
            if( $data !== false ) {
                return;
            }

            // Start of Metrics
            global $blog_id, $wpdb;

            $hash = get_option( 'Yoast_Tracking_Hash', false );

            if ( ! $hash || empty( $hash ) ) {
                // create and store hash
                $hash = md5( site_url() );
                update_option( 'Yoast_Tracking_Hash', $hash );
            }

            $pts        = array();
            $post_types = get_post_types( array( 'public' => true ) );
            if ( is_array( $post_types ) && $post_types !== array() ) {
                foreach ( $post_types as $post_type ) {
                    $count           = wp_count_posts( $post_type );
                    $pts[$post_type] = $count->publish;
                }
            }
            unset( $post_types );

            $comments_count = wp_count_comments();

            $theme_data = wp_get_theme();
            $theme      = array(
                'name'       => $theme_data->display( 'Name', false, false ),
                'theme_uri'  => $theme_data->display( 'ThemeURI', false, false ),
                'version'    => $theme_data->display( 'Version', false, false ),
                'author'     => $theme_data->display( 'Author', false, false ),
                'author_uri' => $theme_data->display( 'AuthorURI', false, false ),
            );
            $theme_template = $theme_data->get_template();
            if ( $theme_template !== '' && $theme_data->parent() ) {
                $theme['template'] = array(
                    'version'    => $theme_data->parent()->display( 'Version', false, false ),
                    'name'       => $theme_data->parent()->display( 'Name', false, false ),
                    'theme_uri'  => $theme_data->parent()->display( 'ThemeURI', false, false ),
                    'author'     => $theme_data->parent()->display( 'Author', false, false ),
                    'author_uri' => $theme_data->parent()->display( 'AuthorURI', false, false ),
                );
            }
            else {
                $theme['template'] = '';
            }
            unset( $theme_template );


            $plugins = array();
            $active_plugin = get_option( 'active_plugins' );
            foreach ( $active_plugin as $plugin_path ) {
                if ( ! function_exists( 'get_plugin_data' ) ) {
                    require_once( ABSPATH . 'wp-admin/includes/plugin.php' );
                }

                $plugin_info = get_plugin_data( WP_PLUGIN_DIR . '/' . $plugin_path );

                $slug           = str_replace( '/' . basename( $plugin_path ), '', $plugin_path );
                $plugins[$slug] = array(
                    'version'    => $plugin_info['Version'],
                    'name'       => $plugin_info['Name'],
                    'plugin_uri' => $plugin_info['PluginURI'],
                    'author'     => $plugin_info['AuthorName'],
                    'author_uri' => $plugin_info['AuthorURI'],
                );
            }
            unset( $active_plugins, $plugin_path );

            $data = array(
                'site'     => array(
                    'hash'      => $hash,
                    'version'   => get_bloginfo( 'version' ),
                    'multisite' => is_multisite(),
                    'users'     => $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $wpdb->users INNER JOIN $wpdb->usermeta ON ({$wpdb->users}.ID = {$wpdb->usermeta}.user_id) WHERE 1 = 1 AND ( {$wpdb->usermeta}.meta_key = %s )", 'wp_' . $blog_id . '_capabilities' ) ),
                    'lang'      => get_locale(),
                ),
                'pts'      => $pts,
                'comments' => array(
                    'total'    => $comments_count->total_comments,
                    'approved' => $comments_count->approved,
                    'spam'     => $comments_count->spam,
                    'pings'    => $wpdb->get_var( "SELECT COUNT(comment_ID) FROM $wpdb->comments WHERE comment_type = 'pingback'" ),
                ),
                'options'  => apply_filters( 'yoast_tracking_filters', array() ),
                'theme'    => $theme,
                'plugins'  => $plugins,
            );

            $args = array(
                'body' => $data,
            );
            wp_remote_post( 'https://tracking.yoast.com/', $args );

            // Store for a week, then push data again.
            set_transient( 'yoast_tracking_cache', true, 60 * 60 * 24 * 7 );

        }
    } /* End of class */
} /* End of class-exists wrapper */

/**
 * Adds tracking parameters for WP SEO settings. Outside of the main class as the class could also be in use in other plugins.
 *
 * @param array $options
 * @return array
 */
function wpseo_tracking_additions( $options ) {
    $opt = WPSEO_Options::get_all();

    $options['wpseo'] = array(
        'xml_sitemaps'        => ( $opt['enablexmlsitemap'] === true ) ? 1 : 0,
        'force_rewrite'       => ( $opt['forcerewritetitle'] === true ) ? 1 : 0,
        'opengraph'           => ( $opt['opengraph'] === true ) ? 1 : 0,
        'twitter'             => ( $opt['twitter'] === true ) ? 1 : 0,
        'strip_category_base' => ( $opt['stripcategorybase'] === true ) ? 1 : 0,
        'on_front'            => get_option( 'show_on_front' ),
    );
    return $options;
}

add_filter( 'yoast_tracking_filters', 'wpseo_tracking_additions' );