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<?php
/**
* @package Google Structured Data
* @version 5.6.5 Pro
*
* @author Tassos Marinos <info@tassos.gr>
* @link http://www.tassos.gr
* @copyright Copyright © 2021 Tassos Marinos All Rights Reserved
* @license GNU GPLv3 <http://www.gnu.org/licenses/gpl.html> or later
*/
namespace GSD;
defined('_JEXEC') or die('Restricted Access');
use Joomla\String\StringHelper;
use Joomla\CMS\Factory;
class SchemaCleaner
{
/**
* Remove JSON-LD Structured Data injected by the integration or 3rd party extensions.
*
* Note: This method should be called either in the onAfterRender or in the onAfterInitialize Events when the document's buffer is available.
*
* @param mixed $schema_type Search and remove only specific schema types
* @param mixed $remove_json If true, the JSON-based markup will be removed from the page
* @param mixed $remove_microdata If true, the microdata-based will be removed from the page
*
* @return void
*/
public static function remove($schema_type, $remove_json = true, $remove_microdata = true)
{
if (empty($schema_type))
{
return;
}
$app = Factory::getApplication();
// Get document buffer
$body = $app->getBody();
$replacements_count = 0;
$schema_types = (array) $schema_type;
// Search and remove JSON-LD scripts
if ($remove_json)
{
foreach ($schema_types as $schema_type)
{
$replacements_count += self::removeJSONSchema($body, strtolower($schema_type));
}
}
// Search and remove microdata
if ($remove_microdata)
{
foreach ($schema_types as $schema_type)
{
$replacements_count += self::removeMicrodata($body, strtolower($schema_type));
}
}
// If no replacements made, exit.
if ($replacements_count == 0)
{
return;
}
// Set the new document body back.
$app->setBody($body);
}
/**
* Remove microdata from a string
*
* @param string $text The text to search for
* @param mixed $schema_type Search and remove only specific schema types
*
* @return integer
*/
private static function removeMicrodata(&$text, $schema_type = null)
{
// Simple check to decide whether the plugin should procceed or not.
if (StringHelper::strpos($text, 'itemtype') === false)
{
return;
}
// Base replacement pattern
// We do not include itemprop property here as some components renders the element
// like itemscope itemtype="http://schema.org/" or itemscope="" itemtype="http://schema.org/"
$patterns = ['/(itemscope)? itemtype=(\'|")?http(s?):\/\/(www.)?schema.org\/' . $schema_type . '(\'|")?/msi'];
if ($schema_type == 'all')
{
$patterns = [
'/(itemscope)? itemtype=(\'|")?http(s?):\/\/(.*?)schema.org\/(.*?(\'|"))(\'|")?/msi',
'/<meta(.*?)(itemscope|itemprop)(.*?)\/?>/',
'/itemprop=("|\')(.*?)("|\')/'
];
}
// Extra rules for the Event type
if ($schema_type == 'event')
{
$extra_patterns = [
'/<meta itemprop="(url|startDate|addressRegion|postalCode|latitude|longitude|streetAddress|addressLocality)"[^>]+>/'
];
$patterns = array_merge($patterns, $extra_patterns);
}
// Extra rules for the Article type
if ($schema_type == 'article')
{
$extra_patterns = [
'/itemprop="(url|name|author|headline|image|keywords|articleBody|datePublished)"/',
'/<meta itemprop="(inLanguage|datePublished)"[^>]+>/'
];
$patterns = array_merge($patterns, $extra_patterns);
}
// Extra rules for the Product type
if ($schema_type == 'product')
{
$extra_patterns = [
'/<meta itemprop="(price|priceCurrency)"[^>]+>/',
'/itemprop="(sku|description|offers|name)"/',
'/<link itemprop="availability" href="http(s?):\/\/schema.org\/InStock" \/>/'
];
$patterns = array_merge($patterns, $extra_patterns);
}
// Extra rules for the Breadcrumbs type
if ($schema_type == 'breadcrumblist')
{
$extra_patterns = [
'/itemprop="(itemListElement|position|item)"/',
'/itemscope itemtype="http(s?):\/\/schema.org\/ListItem"/'
];
$patterns = array_merge($patterns, $extra_patterns);
}
// Extra rules for the AggregateRating type
if ($schema_type == 'aggregaterating')
{
$extra_patterns = [
'/itemprop="(aggregateRating|ratingValue|bestRating)"/',
'/<meta itemprop="(ratingCount|bestRating|worstRating)"[^>]+>/',
];
$patterns = array_merge($patterns, $extra_patterns);
}
// Do the replacements and return the number of replacements
$text = preg_replace($patterns, '', $text, -1, $count);
return $count;
}
/**
* Remove JSON-LD scripts from a string
*
* @param string $text The text to search for
* @param mixed $schema_type Search and remove only specific schema types
*
* @return integer
*/
private static function removeJSONSchema(&$text, $schema_type = null)
{
// Simple check to decide whether we should procceed or not.
if (StringHelper::strpos($text, '//schema.org/') === false)
{
return;
}
$re = '/<script[^>]*type="application\/ld\+json"[^>]*>([\s\S]*?)<\/script>/msi';
preg_match_all($re, $text, $matches, PREG_SET_ORDER, 0);
if (!$matches)
{
return;
}
$replacements_count = 0;
foreach ($matches as $match)
{
// Ignore our scripts
if (strpos($match[0], 'data-type="gsd"') !== false)
{
continue;
}
// If we are searching for a specific schema type, make sure it exists.
if (!is_null($schema_type) && !preg_match('/"@type"\s*:\s*"' . $schema_type . '"/si', $match[1]))
{
continue;
}
$text = str_replace($match[0], '', $text);
$replacements_count++;
}
return $replacements_count;
}
}