<?php
namespace MailPoet\Newsletter\Renderer\PostProcess;
if (!defined('ABSPATH')) exit;
use MailPoet\Newsletter\Links\Links;
use MailPoet\Newsletter\Renderer\Renderer;
use MailPoet\Util\pQuery\pQuery;
use MailPoet\WP\Functions as WPFunctions;
class OpenTracking {
public static function process($template) {
$DOM = new pQuery();
$DOM = $DOM->parseStr($template);
$template = $DOM->query('body');
// url is a temporary data tag that will be further replaced with
// the proper track API URL during sending
$url = Links::DATA_TAG_OPEN;
$openTrackingImage = sprintf(
'<img alt="" class="" src="%s"/>',
$url
);
$template->html($template->html() . $openTrackingImage);
return $DOM->__toString();
}
public static function addTrackingImage() {
WPFunctions::get()->addFilter(Renderer::FILTER_POST_PROCESS, function ($template) {
return OpenTracking::process($template);
});
return true;
}
}