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<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
declare(strict_types=1);
namespace Magento\Theme\Controller\Result;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\App\Response\HttpInterface as HttpResponseInterface;
use Magento\Framework\App\ResponseInterface;
use Magento\Framework\View\Result\Layout;
use Magento\Store\Model\ScopeInterface;
/**
* Plugin for putting all JavaScript tags to the end of body.
*/
class JsFooterPlugin
{
private const XML_PATH_DEV_MOVE_JS_TO_BOTTOM = 'dev/js/move_script_to_bottom';
/**
* @var ScopeConfigInterface
*/
private $scopeConfig;
/**
* @param ScopeConfigInterface $scopeConfig
*/
public function __construct(ScopeConfigInterface $scopeConfig)
{
$this->scopeConfig = $scopeConfig;
}
/**
* Moves all JavaScript tags to the end of body if this feature is enabled.
*
* @param Layout $subject
* @param Layout $result
* @param HttpResponseInterface|ResponseInterface $httpResponse
* @return Layout (That should be void, actually)
* @SuppressWarnings(PHPMD.UnusedFormalParameter)
*/
public function afterRenderResult(Layout $subject, Layout $result, ResponseInterface $httpResponse)
{
if (!$this->isDeferEnabled()) {
return $result;
}
$content = (string)$httpResponse->getContent();
$bodyEndTag = '</body';
$bodyEndTagFound = strrpos($content, $bodyEndTag) !== false;
if ($bodyEndTagFound) {
$scripts = $this->extractScriptTags($content);
if ($scripts) {
$newBodyEndTagPosition = strrpos($content, $bodyEndTag);
$content = substr_replace($content, $scripts . "\n", $newBodyEndTagPosition, 0);
$httpResponse->setContent($content);
}
}
return $result;
}
/**
* Extracts and returns script tags found in given content.
*
* @param string $content
*/
private function extractScriptTags(&$content): string
{
$scripts = '';
$scriptOpen = '<script';
$scriptClose = '</script>';
$scriptOpenPos = strpos($content, $scriptOpen);
while ($scriptOpenPos !== false) {
$scriptClosePos = strpos($content, $scriptClose, $scriptOpenPos);
$script = substr($content, $scriptOpenPos, $scriptClosePos - $scriptOpenPos + strlen($scriptClose));
$isXMagentoTemplate = strpos($script, 'text/x-magento-template') !== false;
if ($isXMagentoTemplate) {
$scriptOpenPos = strpos($content, $scriptOpen, $scriptClosePos);
continue;
}
$scripts .= "\n" . $script;
$content = str_replace($script, '', $content);
// Script cut out, continue search from its position.
$scriptOpenPos = strpos($content, $scriptOpen, $scriptOpenPos);
}
return $scripts;
}
/**
* Returns information whether moving JS to footer is enabled
*
* @return bool
*/
private function isDeferEnabled(): bool
{
return $this->scopeConfig->isSetFlag(
self::XML_PATH_DEV_MOVE_JS_TO_BOTTOM,
ScopeInterface::SCOPE_STORE
);
}
}