File: //proc/self/root/home/cafsindia/www/wp-content/plugins/wp-asset-clean-up/classes/Preloads.php
<?php
namespace WpAssetCleanUp;
use WpAssetCleanUp\OptimiseAssets\OptimizeCss;
/**
* Class Preloads
* @package WpAssetCleanUp
*/
class Preloads
{
/**
* Printed in HEAD
*/
const DEL_STYLES_PRELOADS = '<meta name="wpacu-generator" content="ASSET CLEANUP STYLES PRELOADS">';
/**
* Printed in HEAD
*/
const DEL_SCRIPTS_PRELOADS = '<meta name="wpacu-generator" content="ASSET CLEANUP SCRIPTS PRELOADS">';
/**
* @var array
*/
public $preloads = array('styles' => array(), 'scripts' => array());
/**
* @var Preloads|null
*/
private static $singleton;
/**
* @return null|Preloads
*/
public static function instance()
{
if (self::$singleton === null) {
self::$singleton = new self();
}
return self::$singleton;
}
/**
* Preloads constructor.
*/
public function __construct()
{
if (is_admin() || self::preventPreload()) {
return;
}
$this->preloads = $this->getPreloads();
add_filter('wpfc_buffer_callback_filter', static function ($buffer) {
$buffer = str_replace('rel=\'preload\' data-from-rel=\'stylesheet\'', 'rel=\'preload\'', $buffer);
return $buffer;
});
}
/**
*
*/
public function init()
{
if (self::preventPreload()) {
return;
}
if (! is_admin()) { // Trigger only in the front-end
add_filter('style_loader_tag', array($this, 'preloadCss'), 10, 2);
add_filter('script_loader_tag', array($this, 'preloadJs'), 10, 2);
} else { // Trigger only within the Dashboard
if (Misc::getVar('post', 'wpacu_remove_preloaded_assets_nonce')) {
add_action('admin_init', static function() {
Preloads::removePreloadFromChosenAssets();
});
}
// Trigger only in "Bulk Changes" -> "Preloaded CSS/JS"
if (isset($_GET['page']) && $_GET['page'] === WPACU_PLUGIN_ID.'_bulk_unloads'
&& get_transient('wpacu_preloads_just_removed')) {
add_action('wpacu_admin_notices', array($this, 'noticePreloadsRemoved'));
delete_transient('wpacu_preloads_just_removed');
}
}
}
/**
* @param $htmlSource
*
* @return mixed
*/
public function doChanges($htmlSource)
{
if (self::preventPreload()) {
return $htmlSource;
}
$this->preloads = $this->getPreloads();
if (isset($this->preloads['styles']) && ! empty($this->preloads['styles'])) {
$htmlSource = self::appendPreloadsForStylesToHead($htmlSource);
}
return $htmlSource;
}
/**
* @param string $for
* @return bool
*/
public function enablePreloads($for)
{
if (self::preventPreload()) {
return false;
}
$assetType = ($for === 'css') ? 'styles' : 'scripts';
if (! (isset($this->preloads[$assetType]) && ! empty($this->preloads[$assetType]))) {
return false;
}
// Do not use the preloads if "Optimize CSS Delivery" is enabled in WP Rocket
if ($for === 'css' && Misc::isPluginActive('wp-rocket/wp-rocket.php') && function_exists('get_rocket_option') && get_rocket_option('async_css')) {
return false;
}
// WP Fastest Cache: Combine CSS/JS is enabled
if (! Menu::userCanManageAssets() && Misc::isPluginActive('wp-fastest-cache/wpFastestCache.php')) {
$wpfcOptionsJson = get_option('WpFastestCache');
$wpfcOptions = @json_decode($wpfcOptionsJson, ARRAY_A);
if ($for === 'css' && isset($wpfcOptions['wpFastestCacheCombineCss'])) {
return false;
}
if ($for === 'js' && isset($wpfcOptions['wpFastestCacheCombineJs'])) {
return false;
}
}
// W3 Total Cache
if (Misc::isPluginActive('w3-total-cache/w3-total-cache.php')) {
$w3tcConfigMaster = Misc::getW3tcMasterConfig();
if ($for === 'css') {
$w3tcEnableCss = (int)trim(Misc::extractBetween($w3tcConfigMaster, '"minify.css.enable":', ','), '" ');
if ($w3tcEnableCss === 1) {
return false;
}
}
if ($for === 'js') {
$w3tcEnableJs = (int)trim(Misc::extractBetween($w3tcConfigMaster, '"minify.js.enable":', ','), '" ');
if ($w3tcEnableJs === 1) {
return false;
}
}
}
// LiteSpeed Cache
if (Misc::isPluginActive('litespeed-cache/litespeed-cache.php') && ($liteSpeedCacheConf = apply_filters('litespeed_cache_get_options', get_option('litespeed-cache-conf')))) {
if ($for === 'css' && isset($liteSpeedCacheConf['css_minify']) && $liteSpeedCacheConf['css_minify']) {
return false;
}
if ($for === 'js' && isset($liteSpeedCacheConf['js_minify']) && $liteSpeedCacheConf['js_minify']) {
return false;
}
}
return true;
}
/**
* @return array
*/
public function getPreloads()
{
$preloadsListJson = get_option(WPACU_PLUGIN_ID . '_global_data');
if ($preloadsListJson) {
$preloadsList = @json_decode($preloadsListJson, true);
// Issues with decoding the JSON file? Return an empty list
if (Misc::jsonLastError() !== JSON_ERROR_NONE) {
return $this->preloads;
}
// Are new positions set for styles and scripts?
foreach (array('styles', 'scripts') as $assetKey) {
if ( isset( $preloadsList[$assetKey]['preloads'] ) && ! empty( $preloadsList[$assetKey]['preloads'] ) ) {
$this->preloads[$assetKey] = $preloadsList[$assetKey]['preloads'];
}
}
}
return $this->preloads;
}
/**
* @param $htmlTag
* @param $handle
*
* @return string
*/
public function preloadCss($htmlTag, $handle)
{
if (Plugin::preventAnyFrontendOptimization() || self::preventPreload()) {
return $htmlTag;
}
if ($wpacuAsyncPreloadHandle = Misc::getVar('get', 'wpacu_preload_css')) {
// For testing purposes: Check how the page loads with the requested CSS preloaded
$this->preloads['styles'][$wpacuAsyncPreloadHandle] = 'basic';
}
// Only valid for front-end pages with LINKs
if (is_admin() || (! $this->enablePreloads('css')) || strpos($htmlTag,'<link ') === false || Main::instance()->preventAssetsSettings()) {
return $htmlTag;
}
if (! isset($this->preloads['styles'])) {
return $htmlTag;
}
if (array_key_exists($handle, $this->preloads['styles']) && $this->preloads['styles'][$handle]) {
if (isset($_REQUEST['wpacu_no_css_preload_basic'])) { // do not apply it for debugging purposes
return str_replace('<link ', '<link data-wpacu-skip-preload=\'1\' ', $htmlTag);
}
ObjectCache::wpacu_cache_set($handle, 1, 'wpacu_basic_preload_handles');
return str_replace('<link ', '<link data-wpacu-to-be-preloaded-basic=\'1\' ', $htmlTag);
}
return $htmlTag;
}
/**
* @param $htmlTag
* @param $handle
* @return string
*/
public function preloadJs($htmlTag, $handle)
{
if (Plugin::preventAnyFrontendOptimization() || self::preventPreload()) {
return $htmlTag;
}
if (isset($_REQUEST['wpacu_no_js_preload_basic'])) {
return str_replace('<script ', '<script data-wpacu-skip-preload=\'1\' ', $htmlTag);
}
// For testing purposes: Check how the page loads with the requested JS preloaded
if ($wpacuJsPreloadHandle = Misc::getVar('get', 'wpacu_preload_js')) {
$this->preloads['scripts'][$wpacuJsPreloadHandle] = 1;
}
// Only valid for front-end pages with SCRIPTs
if (is_admin() || (! $this->enablePreloads('js')) || strpos($htmlTag,'<script ') === false || Main::instance()->preventAssetsSettings()) {
return $htmlTag;
}
if (! isset($this->preloads['scripts'])) {
return $htmlTag;
}
if (array_key_exists($handle, $this->preloads['scripts']) && $this->preloads['scripts'][$handle]) {
return str_replace('<script ', '<script data-wpacu-to-be-preloaded-basic=\'1\' ', $htmlTag);
}
return $htmlTag;
}
/**
* @param $htmlSource
*
* @return mixed
*/
public static function appendPreloadsForStylesToHead($htmlSource)
{
if (self::preventPreload()) {
return $htmlSource;
}
// Perhaps it's not applicable in the current page (no LINK tags are loaded that should be preloaded)
if (strpos($htmlSource, 'data-wpacu-to-be-preloaded-basic') === false) {
return $htmlSource;
}
$allHrefs = array();
$stickToRegEx = true; // default
// Something might not be right with the RegEx; Fallback to DOMDocument, more accurate, but slower
if ( Misc::isDOMDocumentOn() ) {
$documentForCSS = Misc::initDOMDocument();
$htmlSourceAlt = preg_replace( '@<(noscript|style|script)[^>]*?>.*?</\\1>@si', '', $htmlSource );
$documentForCSS->loadHTML($htmlSourceAlt);
$linkTags = $documentForCSS->getElementsByTagName( 'link' );
if ( count($linkTags) > 0 ) {
$matchesSourcesFromLinkTags = array(); // reset its value; new fetch method was used
foreach ( $linkTags as $tagObject ) {
if ( empty( $tagObject->attributes ) ) {
continue;
}
$linkAttributes = array();
foreach ( $tagObject->attributes as $attrObj ) {
$linkAttributes[ $attrObj->nodeName ] = trim( $attrObj->nodeValue );
}
if ( ! isset( $linkAttributes['data-wpacu-to-be-preloaded-basic'], $linkAttributes['href'] ) ) {
continue;
}
if (strpos($htmlSourceAlt, $linkAttributes['href']) === false) {
$stickToRegEx = true; // the source value is not the same as in the HTML source (e.g. altered by the DOM) / fallback to RegEx
break;
}
$linkTag = Misc::getOuterHTML( $tagObject );
$allHrefs[$linkTag] = $linkAttributes['href'];
}
}
libxml_clear_errors();
}
if ($stickToRegEx) {
// Use the RegEx as it's much faster and very accurate in this situation
$strContainsFormat = preg_quote('data-wpacu-to-be-preloaded-basic', '/');
preg_match_all('#<link[^>]*'.$strContainsFormat.'[^>]*' . '\shref(\s+|)=(\s+|)(\'|"|)(.*)(\\3)' . '.*(>)#Usmi', $htmlSource, $matchesSourcesFromLinkTags, PREG_SET_ORDER);
if ( ! empty($matchesSourcesFromLinkTags) ) {
foreach ( $matchesSourcesFromLinkTags as $linkTagArray ) {
$linkTag = isset( $linkTagArray[0] ) ? $linkTagArray[0] : false;
if ($linkTag) {
$linkHref = isset( $linkTagArray[0] ) ? Misc::getValueFromTag( $linkTag ) : false;
if ( $linkHref ) {
$allHrefs[$linkTag] = $linkHref;
}
}
}
}
}
$allHrefs = array_unique($allHrefs);
if ( ! empty($allHrefs) ) {
foreach ( $allHrefs as $linkTag => $linkHref ) {
$condBefore = $condAfter = '';
// Any IE comments around the tag?
$scriptIdAttr = Misc::getValueFromTag($linkTag, 'id');
if ($scriptIdAttr && substr( $scriptIdAttr, -4 ) === '-css') {
$linkHandle = substr( $scriptIdAttr, 0, -4 );
$linkObj = isset(Main::instance()->wpAllStyles['registered'][$linkHandle]) ? Main::instance()->wpAllStyles['registered'][$linkHandle] : false;
if ($linkObj) {
$conditional = isset($linkObj->extra['conditional']) ? $linkObj->extra['conditional'] : '';
if ($conditional) {
$condBefore = "<!--[if {$conditional}]>\n";
$condAfter = "<![endif]-->\n";
}
}
}
$linkPreload = $condBefore;
$linkPreload .= self::linkPreloadCssFormat( $linkHref );
$linkPreload .= $condAfter;
$htmlSource = str_replace( self::DEL_STYLES_PRELOADS, $linkPreload . self::DEL_STYLES_PRELOADS, $htmlSource );
}
}
return $htmlSource;
}
/**
* @param $linkHref
*
* @return string
*/
public static function linkPreloadCssFormat($linkHref)
{
if (self::preventPreload()) {
return $linkHref;
}
if (OptimizeCss::wpfcMinifyCssEnabledOnly()) {
return '<link rel=\'preload\' data-from-rel=\'stylesheet\' as=\'style\' data-href-before=\''.$linkHref.'\' href=\''.esc_attr($linkHref).'\' data-wpacu-preload-css-basic=\'1\' />' . "\n";
}
return '<link rel=\'preload\' as=\'style\' href=\''.esc_attr($linkHref).'\' data-wpacu-preload-css-basic=\'1\' />'."\n";
}
/**
* @param $htmlSource
*
* @return mixed
*/
public static function appendPreloadsForScriptsToHead($htmlSource)
{
if (self::preventPreload()) {
return $htmlSource;
}
$strContainsFormat = preg_quote('data-wpacu-to-be-preloaded-basic=\'1\'', '/');
preg_match_all('#<script[^>]*'.$strContainsFormat.'[^>]*' . 'src(\s+|)=(\s+|)(\'|"|)(.*)(\\3)' . '.*(>)#Usmi', $htmlSource, $matchesSourcesFromScriptTags, PREG_SET_ORDER);
if (empty($matchesSourcesFromScriptTags)) {
return $htmlSource;
}
foreach ($matchesSourcesFromScriptTags as $scriptTagArray) {
$scriptTag = isset($scriptTagArray[0]) ? $scriptTagArray[0] : false;
if (! $scriptTag) {
continue;
}
$scriptSrc = Misc::getValueFromTag($scriptTag);
$condBefore = $condAfter = '';
// Any IE comments around the tag?
$scriptIdAttr = Misc::getValueFromTag($scriptTag, 'id');
if ($scriptIdAttr && strpos($scriptTag, '-js') !== false) {
$scriptHandle = rtrim($scriptIdAttr, '-js');
if ($scriptHandle) {
$scriptObj = isset(Main::instance()->wpAllScripts['registered'][$scriptHandle]) ? Main::instance()->wpAllScripts['registered'][$scriptHandle] : false;
if ($scriptObj) {
$conditional = isset($scriptObj->extra['conditional']) ? $scriptObj->extra['conditional'] : '';
if ($conditional) {
$condBefore = "<!--[if {$conditional}]>\n";
$condAfter = "<![endif]-->\n";
}
}
}
}
$linkPreload = $condBefore;
$linkPreload .= '<link rel=\'preload\' as=\'script\' href=\''.esc_attr($scriptSrc).'\' data-wpacu-preload-js=\'1\'>'."\n";
$linkPreload .= $condAfter;
$htmlSource = str_replace(self::DEL_SCRIPTS_PRELOADS, $linkPreload . self::DEL_SCRIPTS_PRELOADS, $htmlSource);
}
return $htmlSource;
}
/**
*
*/
public static function updatePreloads()
{
$useGlobalPost = false;
if ( (isset($_POST[WPACU_FORM_ASSETS_POST_KEY]['styles']) && ! empty($_POST[WPACU_FORM_ASSETS_POST_KEY]['styles']))
|| (isset($_POST[WPACU_FORM_ASSETS_POST_KEY]['scripts']) && ! empty($_POST[WPACU_FORM_ASSETS_POST_KEY]['scripts'])) ) {
$mainVarToUse = self::updatePreloadsAdapt($_POST[WPACU_FORM_ASSETS_POST_KEY]); // New form fields (starting from v1.1.9.9)
} elseif (Misc::isValidRequest('post', 'wpacu_preloads')) {
$useGlobalPost = true;
} else {
return;
}
if (! $useGlobalPost && isset($mainVarToUse['wpacu_preloads'])) {
$bucketToUse = $mainVarToUse['wpacu_preloads'];
} else if (isset($_POST['wpacu_preloads'])) {
$bucketToUse = $_POST['wpacu_preloads'];
}
if (! isset($bucketToUse['styles']) && ! isset($bucketToUse['scripts'])) {
return;
}
$optionToUpdate = WPACU_PLUGIN_ID . '_global_data';
$globalKey = 'preloads';
$existingListEmpty = array('styles' => array($globalKey => array()), 'scripts' => array($globalKey => array()));
$existingListJson = get_option($optionToUpdate);
$existingListData = Main::instance()->existingList($existingListJson, $existingListEmpty);
$existingList = $existingListData['list'];
foreach (array('styles', 'scripts') as $assetType) {
if ( isset( $bucketToUse[$assetType] ) && ! empty( $bucketToUse[$assetType] ) ) {
foreach ( $bucketToUse[$assetType] as $assetHandle => $assetPreload ) {
$assetPreload = trim( $assetPreload );
if ( $assetPreload === '' && isset( $existingList[$assetType][ $globalKey ][ $assetHandle ] ) ) {
unset( $existingList[$assetType][ $globalKey ][ $assetHandle ] );
} elseif ( $assetPreload !== '' ) {
$existingList[$assetType][ $globalKey ][ $assetHandle ] = $assetPreload;
}
}
}
}
Misc::addUpdateOption($optionToUpdate, wp_json_encode(Misc::filterList($existingList)));
}
/**
* @param $mainFormArray
*
* @return array
*/
public static function updatePreloadsAdapt($mainFormArray)
{
$wpacuPreloadsList = array();
foreach (array('styles', 'scripts') as $assetKey) {
if (isset($mainFormArray[$assetKey]) && ! empty($mainFormArray[$assetKey])) {
foreach ($mainFormArray[$assetKey] as $assetHandle => $assetData) {
$wpacuPreloadsList['wpacu_preloads'][$assetKey][$assetHandle] = ''; // default
if (isset($assetData['preload']) && $assetData['preload']) {
$wpacuPreloadsList['wpacu_preloads'][ $assetKey ][ $assetHandle ] = $assetData['preload']; // 'basic' or 'async'
}
}
}
}
return $wpacuPreloadsList;
}
/**
* Triggered from "Bulk Unloads" - "Preloaded CSS/JS"
* after the selection is made and button is clicked
*
* @return void
*/
public static function removePreloadFromChosenAssets()
{
$stylesCheckedList = Misc::getVar('post', 'wpacu_styles_remove_preloads', array());
$scriptsCheckedList = Misc::getVar('post', 'wpacu_scripts_remove_preloads', array());
if (empty($stylesCheckedList) && empty($scriptsCheckedList)) {
return;
}
\check_admin_referer('wpacu_remove_preloaded_assets', 'wpacu_remove_preloaded_assets_nonce');
$optionToUpdate = WPACU_PLUGIN_ID . '_global_data';
$globalKey = 'preloads';
$existingListEmpty = array('styles' => array($globalKey => array()), 'scripts' => array($globalKey => array()));
$existingListJson = get_option($optionToUpdate);
$existingListData = Main::instance()->existingList($existingListJson, $existingListEmpty);
$existingList = $existingListData['list'];
if (! empty($stylesCheckedList)) {
foreach ($stylesCheckedList as $styleHandle => $action) {
if ($action === 'remove') {
unset($existingList['styles'][$globalKey][$styleHandle]);
}
}
}
if (! empty($scriptsCheckedList)) {
foreach ($scriptsCheckedList as $scriptHandle => $action) {
if ($action === 'remove') {
unset($existingList['scripts'][$globalKey][$scriptHandle]);
}
}
}
Misc::addUpdateOption($optionToUpdate, wp_json_encode(Misc::filterList($existingList)));
set_transient('wpacu_preloads_just_removed', 1, 30);
wp_safe_redirect(admin_url('admin.php?page=wpassetcleanup_bulk_unloads&wpacu_bulk_menu_tab=preloaded_assets&wpacu_time='.time()));
exit();
}
/**
*
*/
public function noticePreloadsRemoved()
{
?>
<div class="updated notice wpacu-notice is-dismissible">
<p><span class="dashicons dashicons-yes"></span>
<?php
_e('The preload option was removed for the chosen CSS/JS.', 'wp-asset-clean-up');
?>
</p>
</div>
<?php
}
/**
* @return bool
*/
public static function preventPreload()
{
if (defined('WPACU_ALLOW_ONLY_UNLOAD_RULES') && WPACU_ALLOW_ONLY_UNLOAD_RULES) {
return true;
}
return false;
}
}