abtest/Classes/MatomoTracker.php
Daniel Siepmann 9f0e6cd6c5
Integrate Matomo tracking for A/B Testing (#2)
* Adds new fields to pages.
* Adds new event handler and integration to add necessary JS to track
  experiment with variant.
2023-03-06 14:39:21 +01:00

62 lines
2 KiB
PHP

<?php
declare(strict_types=1);
/*
* Copyright (C) 2023 Daniel Siepmann <coding@daniel-siepmann.de>
*
* 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.
*/
namespace WerkraumMedia\ABTest;
use WerkraumMedia\ABTest\Events\SwitchedToVariant;
class MatomoTracker
{
private string $experiment = '';
private string $variation = '';
public function handleVariant(SwitchedToVariant $event): void
{
$this->experiment = $event->getOriginalPage()['tx_abtest_matomo_experiment_id'] ?? '';
$this->variation = $event->getVariantPage()['tx_abtest_matomo_variant_id'] ?? '';
}
public function addScriptToHtmlMarkup(string $markup): string
{
if ($this->experiment === '' || $this->variation === '') {
return $markup;
}
$script = $this->generateScript();
return str_replace('</body>', $script . '</body>', $markup);
}
private function generateScript(): string
{
$experiment = htmlspecialchars($this->experiment);
$variation = htmlspecialchars($this->variation);
return '<script>'
. 'var _paq = window._paq = window._paq || [];'
. "_paq.push(['AbTesting::enter', {experiment: '$experiment', variation: '$variation'}]);"
. '</script>'
. PHP_EOL
;
}
}