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<?php
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namespace WpAssetCleanUp\OptimiseAssets;
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/**
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* Class FontsGoogle
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* @package WpAssetCleanUp\OptimiseAssets
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*/
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class FontsGoogleRemove
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{
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/**
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* @var array
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*/
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public static $stringsToCheck = array(
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'//fonts.googleapis.com',
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'//fonts.gstatic.com'
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);
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/**
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* @var array
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*/
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public static $possibleWebFontConfigCdnPatterns = array(
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'//ajax.googleapis.com/ajax/libs/webfont/(.*?)', // Google Apis
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'//cdnjs.cloudflare.com/ajax/libs/webfont/(.*?)', // Cloudflare
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'//cdn.jsdelivr.net/npm/webfontloader@(.*?)' // jsDELIVR
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);
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/**
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* Called late from OptimizeCss after all other optimizations are done (e.g. minify, combine)
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*
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* @param $htmlSource
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*
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* @return mixed
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*/
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public static function cleanHtmlSource($htmlSource)
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{
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$htmlSource = self::cleanLinkTags($htmlSource);
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$htmlSource = self::cleanFromInlineStyleTags($htmlSource);
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return str_replace(FontsGoogle::NOSCRIPT_WEB_FONT_LOADER, '', $htmlSource);
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}
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/**
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* @param $htmlSource
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*
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* @return mixed
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*/
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public static function cleanLinkTags($htmlSource)
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{
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// Do not continue if there is no single reference to the string we look for in the clean HTML source
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if (stripos($htmlSource, FontsGoogle::$containsStr) === false) {
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return $htmlSource;
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}
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// Get all valid LINKs that have the self::$stringsToCheck within them
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$strContainsArray = array_map(static function($containsStr) {
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return preg_quote($containsStr, '/');
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}, self::$stringsToCheck);
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$strContainsFormat = implode('|', $strContainsArray);
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preg_match_all('#<link[^>]*(' . $strContainsFormat . ').*(>)#Usmi', $htmlSource, $matchesFromLinkTags, PREG_SET_ORDER);
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$stripLinksList = array();
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// Needs to match at least one to carry on with the replacements
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if (isset($matchesFromLinkTags[0]) && ! empty($matchesFromLinkTags[0])) {
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foreach ($matchesFromLinkTags as $linkTagArray) {
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$linkTag = trim(trim($linkTagArray[0], '"\''));
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if (strip_tags($linkTag) !== '') {
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continue; // Something might be funny there, make sure the tag is valid
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}
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// Check if the Google Fonts CSS has any 'data-wpacu-skip' attribute; if it does, do not remove it
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if (preg_match('#data-wpacu-skip([=>/ ])#i', $linkTag)) {
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continue;
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}
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$stripLinksList[$linkTag] = '';
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}
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$htmlSource = strtr($htmlSource, $stripLinksList);
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}
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return $htmlSource;
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}
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/**
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* @param $htmlSource
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*
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* @return mixed
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*/
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public static function cleanFromInlineStyleTags($htmlSource)
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{
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if (! preg_match('/(;?)(@import (?<url>url\(|\()?(?P<quotes>["\'()]?).+?(?P=quotes)(?(url)\)));?/', $htmlSource)) {
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return $htmlSource;
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}
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preg_match_all('#<\s*?style\b[^>]*>(.*?)</style\b[^>]*>#s', $htmlSource, $styleMatches, PREG_SET_ORDER);
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if (empty($styleMatches)) {
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return $htmlSource;
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}
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// Go through each STYLE tag
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foreach ($styleMatches as $styleInlineArray) {
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list($styleInlineTag, $styleInlineContent) = $styleInlineArray;
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// Check if the STYLE tag has any 'data-wpacu-skip' attribute; if it does, do not continue
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if (preg_match('#data-wpacu-skip([=>/ ])#i', $styleInlineTag)) {
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continue;
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}
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$newStyleInlineTag = $styleInlineTag;
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$newStyleInlineContent = $styleInlineContent;
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// Is the content relevant?
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preg_match_all('/(;?)(@import (?<url>url\(|\()?(?P<quotes>["\'()]?).+?(?P=quotes)(?(url)\)));?/', $styleInlineContent, $matches);
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if (isset($matches[0]) && ! empty($matches[0])) {
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foreach ($matches[0] as $matchedImport) {
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$newStyleInlineContent = str_replace($matchedImport, '', $newStyleInlineContent);
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}
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$newStyleInlineContent = trim($newStyleInlineContent);
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// Is the STYLE tag empty after the @imports are removed? It happens on some websites; strip the tag, no point of having it empty
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if ($newStyleInlineContent === '') {
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$htmlSource = str_replace($styleInlineTag, '', $htmlSource);
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} else {
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$newStyleInlineTag = str_replace($styleInlineContent, $newStyleInlineContent, $styleInlineTag);
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$htmlSource = str_replace($styleInlineTag, $newStyleInlineTag, $htmlSource);
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}
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}
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$styleTagAfterImportsCleaned = $newStyleInlineTag;
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$styleTagAfterFontFaceCleaned = trim(self::cleanFontFaceReferences($newStyleInlineContent));
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$newStyleInlineTag = str_replace($newStyleInlineContent, $styleTagAfterFontFaceCleaned, $newStyleInlineTag);
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$htmlSource = str_replace($styleTagAfterImportsCleaned, $newStyleInlineTag, $htmlSource);
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}
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return $htmlSource;
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}
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/**
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* @param $importsAddToTop
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*
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* @return mixed
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*/
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public static function stripGoogleApisImport($importsAddToTop)
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{
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// Remove any Google Fonts imports
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foreach ($importsAddToTop as $importKey => $importToPrepend) {
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if (stripos($importToPrepend, FontsGoogle::$containsStr) !== false) {
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unset($importsAddToTop[$importKey]);
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}
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}
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return $importsAddToTop;
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}
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/**
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* If "Google Font Remove" is active, strip its references from JavaScript code as well
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*
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* @param $jsContent
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*
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* @return string|string[]|null
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*/
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public static function stripReferencesFromJsCode($jsContent)
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{
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if (self::preventAnyChange()) {
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return $jsContent;
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}
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$webFontConfigReferenceOne = "#src(\s+|)=(\s+|)(?<startDel>'|\")(\s+|)((http:|https:|)(".implode('|', self::$possibleWebFontConfigCdnPatterns).")(\s+|))(?<endDel>'|\")#si";
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if (stripos($jsContent, 'WebFontConfig') !== false
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&& preg_match('/(WebFontConfig\.|\'|"|)google(\s+|)([\'":=])/i', $jsContent)
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&& preg_match_all($webFontConfigReferenceOne, $jsContent, $matches) && ! empty($matches)
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) {
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foreach ($matches[0] as $matchIndex => $matchRow) {
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$jsContent = str_replace(
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$matchRow,
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'src=' . $matches['startDel'][$matchIndex] . $matches['endDel'][$matchIndex] . ';/* Stripped by ' . WPACU_PLUGIN_TITLE . ' */',
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$jsContent
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);
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}
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}
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$webFontConfigReferenceTwo = '#("|\')((http:|https:|)//fonts.googleapis.com/(.*?))("|\')#si';
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if (preg_match($webFontConfigReferenceTwo, $jsContent)) {
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$jsContent = preg_replace($webFontConfigReferenceTwo, '\\1\\5', $jsContent);
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}
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return $jsContent;
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}
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/**
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* @param $cssContent
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*
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* @return mixed
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*/
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public static function cleanFontFaceReferences($cssContent)
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{
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if (self::preventAnyChange()) {
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return $cssContent;
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}
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preg_match_all('#@font-face(|\s+){(.*?)}#si', $cssContent, $matchesFromCssCode, PREG_SET_ORDER);
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if (! empty($matchesFromCssCode)) {
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foreach ($matchesFromCssCode as $matches) {
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$fontFaceSyntax = $matches[0];
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preg_match_all('/url(\s+|)\((?![\'"]?(?:data):)[\'"]?([^\'")]*)[\'"]?\)/i', $matches[0], $matchesFromUrlSyntax);
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if (! empty($matchesFromUrlSyntax) && stripos(implode('', $matchesFromUrlSyntax[0]), '//fonts.gstatic.com/') !== false) {
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$cssContent = str_replace($fontFaceSyntax, '', $cssContent);
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}
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}
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}
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return $cssContent;
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}
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/**
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* @return bool
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*/
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public static function preventAnyChange()
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{
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return defined( 'WPACU_ALLOW_ONLY_UNLOAD_RULES' ) && WPACU_ALLOW_ONLY_UNLOAD_RULES;
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}
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}
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