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<?php /** * Send Tracks events on behalf of a user using pixel images in page footer. * * @package WooCommerce\Tracks / defined( 'ABSPATH' ) \|\| exit; /* * WC_Tracks_Footer_Pixel class. / class WC_Tracks_Footer_Pixel { /* * Singleton instance. * * @var WC_Tracks_Footer_Pixel / protected static $instance = null; /* * Events to send to Tracks. * * @var array / protected $events = array(); /* * Instantiate the singleton. * * @return WC_Tracks_Footer_Pixel / public static function instance() { if ( is_null( self::$instance ) ) { self::$instance = new WC_Tracks_Footer_Pixel(); } return self::$instance; } /* * Constructor - attach hooks to the singleton instance. / public function __construct() { add_action( 'admin_footer', array( $this, 'render_tracking_pixels' ) ); add_action( 'shutdown', array( $this, 'send_tracks_requests' ) ); } /* * Record a Tracks event * * @param array $event Array of event properties. * @return bool\|WP_Error True on success, WP_Error on failure. / public static function record_event( $event ) { if ( ! $event instanceof WC_Tracks_Event ) { $event = new WC_Tracks_Event( $event ); } if ( is_wp_error( $event ) ) { return $event; } self::instance()->add_event( $event ); return true; } /* * Add a Tracks event to the queue. * * @param WC_Tracks_Event $event Event to track. / public function add_event( $event ) { $this->events[] = $event; } /* * Add events as tracking pixels to page footer. / public function render_tracking_pixels() { if ( empty( $this->events ) ) { return; } foreach ( $this->events as $event ) { $pixel = $event->build_pixel_url(); if ( ! $pixel ) { continue; } // Add the Request Timestamp and no cache parameter just before the HTTP request. $pixel = WC_Tracks_Client::add_request_timestamp_and_nocache( $pixel ); echo '<img style="position: fixed;" src="', esc_url( $pixel ), '" />'; } $this->events = array(); } /* * Fire off API calls for events that weren't converted to pixels. * * This handles wp_redirect(). / public function send_tracks_requests() { if ( empty( $this->events ) ) { return; } foreach ( $this->events as $event ) { WC_Tracks_Client::record_event( $event ); } } /* * Get all events. / public static function get_events() { return self::instance()->events; } /* * Clear all queued events. */ public static function clear_events() { self::instance()->events = array(); } }