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<?php
/**
* Copyright © Magefan (support@magefan.com). All rights reserved.
* Please visit Magefan.com for license details (https://magefan.com/end-user-license-agreement).
*
* Glory to Ukraine! Glory to the heroes!
*/
declare(strict_types = 1);
namespace Magefan\LazyLoad\Plugin;
use Magefan\LazyLoad\Model\Config;
/**
* Plugin for sitemap generation
*/
class BlockPlugin
{
const LAZY_TAG = '<!-- MAGEFAN_LAZY_LOAD -->';
const REPLACEMENT_LABEL = 'mf-lazy';
const PATTERN = '#<img(?!\s+mfdislazy)([^>]*)(?:\ssrc="([^"]*)")([^>]*)\/?>#isU';
/**
* Request
* @var \Magento\Framework\App\RequestInterface
*/
protected $request;
/**
* Core store config
*
* @var \Magento\Framework\App\Config\ScopeConfigInterface
*/
protected $scopeConfig;
/**
* @var array
*/
protected $blocks;
/**
* Lazy store config
*
* @var \Magefan\LazyLoad\Model\Config
*/
protected $config;
/**
* @var array
*/
protected $skipBlocks = [];
/**
* @param \Magento\Framework\App\RequestInterface $request
* @param \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig
* @param Config $config
* @param array $skipBlocks
*/
public function __construct(
\Magento\Framework\App\RequestInterface $request,
\Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
Config $config,
array $skipBlocks
) {
$this->request = $request;
$this->scopeConfig = $scopeConfig;
$this->config = $config;
$this->skipBlocks = $skipBlocks;
}
/**
* @param \Magento\Framework\View\Element\AbstractBlock $block
* @param string $html
* @return string
*/
public function afterToHtml(\Magento\Framework\View\Element\AbstractBlock $block, $html)
{
if (!$html || !$this->isEnabled($block, (string)$html)) {
return $html;
}
$numberOfReplacements = $this->config->getBlockFirstImagesToSkip($this->getBlockIdentifier($block));
if ($numberOfReplacements) {
$html = $this->removeLoadingLazyAttributeFromFirstNImages($html, $numberOfReplacements);
}
$html = $this->config->getIsJavascriptLazyLoadMethod()
? $this->prepareForJsLazyLoad($block, $html)
: $this->prepareForNativeBrowserLazyLoad($html);
return $html;
}
/**
* @param string $html
* @return string
*/
private function prepareForJsLazyLoad($block, string $html): string
{
$lazyAttribute = ' data-original=';
$pixelSrc = ' src="' . $block->getViewFileUrl('Magefan_LazyLoad::images/pixel.jpg') . '"';
$tmpSrc = 'TMP_SRC';
$tmpDataOriginal = 'TMP_DATA_ORIGINAL';
$html = str_replace($pixelSrc, $tmpSrc, $html);
$html = str_replace($lazyAttribute, $tmpDataOriginal, $html);
$noscript = '';
if ($this->config->isNoScriptEnabled()) {
$noscript = '<noscript>
<img src="$2" $1 $3 />
</noscript>';
}
$html = preg_replace(
self::PATTERN,
'<img data-original="$2" $1 $3/>' . $noscript,
$html
);
$html = str_replace($lazyAttribute, $pixelSrc . $lazyAttribute, $html);
$html = str_replace($tmpSrc, $pixelSrc, $html);
$html = str_replace($tmpDataOriginal, $lazyAttribute, $html);
$html = str_replace(self::LAZY_TAG, '', $html);
/* Disable Owl Slider LazyLoad */
$html = str_replace(
['"lazyLoad":true,', '"lazyLoad":true,', 'owl-lazy'],
['"lazyLoad":false,', '"lazyLoad":false,', ''],
$html
);
/* Fix for page builder bg images */
if (false !== strpos($html, 'background-image-')) {
$html = str_replace('.background-image-', '.tmpbgimg-', $html);
$html = str_replace('background-image-', 'mflazy-background-image mflazy-background-image-', $html);
$html = str_replace('.tmpbgimg-', '.background-image-', $html);
}
return $html;
}
/**
* @param string $html
* @return string
*/
protected function prepareForNativeBrowserLazyLoad(string $html) :string
{
return preg_replace(self::PATTERN, '<img src="$2" $1 $3 loading="lazy" />', $html);
}
/**
* @param \Magento\Framework\View\Element\AbstractBlock $block
* @return string
*/
protected function getBlockIdentifier(\Magento\Framework\View\Element\AbstractBlock $block): string
{
$blockName = $block->getBlockId() ?: $block->getNameInLayout();
$blockTemplate = $block->getTemplate();
$blocks = $this->config->getBlocks();
if (in_array($blockName, $blocks)) {
return $blockName;
} elseif (in_array(get_class($block), $blocks)) {
return get_class($block);
} elseif (in_array($blockTemplate, $blocks)) {
return $blockTemplate;
}
return '';
}
/**
* @param string $html
* @param int $numberOfReplacements
* @return string
*/
protected function removeLoadingLazyAttributeFromFirstNImages(string $html, int $numberOfReplacements):string
{
$position = 0;
if (preg_match_all(self::PATTERN, $html, $matches, PREG_OFFSET_CAPTURE) !== false) {
foreach ($matches[0] as $i => $match) {
if ($i > $numberOfReplacements - 1) {
break;
}
$offset = $match[1] + $position;
$htmlTag = $matches[0][$i][0];
$newHtmlTag = str_replace(
['loading="lazy"', '<img '],
['', '<img mfdislazy="1" fetchpriority="high" '],
$htmlTag
);
$html = substr_replace($html, $newHtmlTag, $offset, strlen($htmlTag));
$position = $position + (strlen($newHtmlTag) - strlen($htmlTag));
}
}
return $html;
}
/**
* Check if lazy load is available for block
* @param \Magento\Framework\View\Element\AbstractBlock $block
* @param string $html
* @return boolean
*/
protected function isEnabled($block, string $html): bool
{
if (PHP_SAPI === 'cli'
|| $this->request->isXmlHttpRequest()
|| false !== stripos($this->request->getFullActionName(), 'ajax')
|| false !== stripos($this->request->getServer('REQUEST_URI'), 'layerednavigationajax')
|| $this->request->getParam('isAjax')
) {
return false;
}
if (!$this->config->getEnabled()) {
return false;
}
if ($this->config->isAllBlocksAddedToLazy() && !$this->isBlockSkipped($block)) {
return true;
}
if (false !== strpos($html, self::LAZY_TAG)) {
return true;
}
if (!$this->getBlockIdentifier($block)) {
return false;
}
return true;
}
/**
* @param $block
* @return bool
*/
private function isBlockSkipped($block): bool
{
return in_array(get_class($block), $this->skipBlocks);
}
}