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/** |
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* Easy Fonts — async Google Fonts blocker. |
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* |
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* Some themes/plugins inject Google/Bunny Fonts at RUNTIME via JavaScript |
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* (document.createElement('link') + appendChild, or an @import in an injected |
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* <style>). Those never appear in the server-rendered HTML, so the PHP output |
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* buffer can't see them. This script: |
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* |
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* 1. Intercepts provider stylesheet <link>s before they enter the DOM and |
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* neutralises them (so the render-blocking Google request is prevented), |
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* 2. Reports the URLs to the server, which self-hosts them on the next render. |
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* |
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* After the first visit the fonts are hosted locally, so the consolidated local |
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* stylesheet covers them and the remote request is gone for everyone. |
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*/ |
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( function () { |
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'use strict'; |
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|
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var CFG = window.EasyFontsAsync; |
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if ( ! CFG || ! CFG.endpoint ) { |
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return; |
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} |
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|
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// Google Fonts (and the WordPress.com Google Fonts proxy) only — Bunny is |
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// intentionally excluded from async blocking. |
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var HOSTS = [ 'fonts.googleapis.com', 'fonts-api.wp.com' ]; |
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var found = {}; |
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|
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function isProviderCss( url ) { |
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if ( ! url || typeof url !== 'string' ) { |
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return false; |
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} |
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for ( var i = 0; i < HOSTS.length; i++ ) { |
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if ( url.indexOf( HOSTS[ i ] + '/css' ) !== -1 || url.indexOf( HOSTS[ i ] + '/icon' ) !== -1 ) { |
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return true; |
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} |
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} |
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return false; |
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} |
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|
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function record( url ) { |
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if ( ! url || found[ url ] ) { |
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return; |
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} |
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found[ url ] = true; |
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schedule(); |
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} |
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|
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// Neutralise a provider <link> so the browser never fetches it. |
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function neutralise( node ) { |
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try { |
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var href = node.getAttribute ? node.getAttribute( 'href' ) : node.href; |
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if ( node.tagName === 'LINK' && isProviderCss( href ) ) { |
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record( href ); |
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// Prevent the fetch: blank rel/href + mark inert. |
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node.setAttribute( 'data-easyfonts-async', '1' ); |
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node.setAttribute( 'media', 'max-width:1px' ); |
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node.setAttribute( 'href', 'data:text/css,' ); |
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node.rel = 'preload'; |
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return true; |
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} |
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} catch ( e ) {} |
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return false; |
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} |
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|
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// 1. Intercept programmatic insertion (catches it before the request fires). |
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function patch( proto, method ) { |
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if ( ! proto || ! proto[ method ] || proto[ method ].__efPatched ) { |
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return; |
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} |
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var original = proto[ method ]; |
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proto[ method ] = function ( node ) { |
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try { |
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if ( node && node.tagName === 'LINK' ) { |
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neutralise( node ); |
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} |
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} catch ( e ) {} |
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return original.apply( this, arguments ); |
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}; |
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proto[ method ].__efPatched = true; |
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} |
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|
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patch( Node.prototype, 'appendChild' ); |
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patch( Node.prototype, 'insertBefore' ); |
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|
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// 2. Safety net: observe anything that still slips into the DOM. |
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function sweep() { |
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var links = document.querySelectorAll( 'link[rel="stylesheet"],link[as="style"]' ); |
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for ( var i = 0; i < links.length; i++ ) { |
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if ( ! links[ i ].getAttribute( 'data-easyfonts-async' ) ) { |
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neutralise( links[ i ] ); |
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} |
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} |
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} |
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|
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if ( window.MutationObserver ) { |
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var obs = new MutationObserver( function ( mutations ) { |
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for ( var i = 0; i < mutations.length; i++ ) { |
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var added = mutations[ i ].addedNodes; |
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for ( var j = 0; j < added.length; j++ ) { |
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if ( added[ j ].tagName === 'LINK' ) { |
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neutralise( added[ j ] ); |
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} |
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} |
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} |
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} ); |
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try { |
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obs.observe( document.documentElement, { childList: true, subtree: true } ); |
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} catch ( e ) {} |
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} |
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|
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// Report collected URLs (debounced, once settled). |
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var timer = null; |
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function schedule() { |
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if ( timer ) { |
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clearTimeout( timer ); |
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} |
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timer = setTimeout( send, 800 ); |
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} |
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|
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var sent = {}; |
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function send() { |
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var urls = []; |
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Object.keys( found ).forEach( function ( u ) { |
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if ( ! sent[ u ] ) { |
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urls.push( u ); |
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sent[ u ] = true; |
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} |
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} ); |
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if ( ! urls.length ) { |
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return; |
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} |
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|
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var payload = JSON.stringify( { urls: urls } ); |
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var url = CFG.endpoint + '?_wpnonce=' + encodeURIComponent( CFG.nonce ); |
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|
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if ( navigator.sendBeacon ) { |
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navigator.sendBeacon( url, new Blob( [ payload ], { type: 'application/json' } ) ); |
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} else { |
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try { |
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var xhr = new XMLHttpRequest(); |
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xhr.open( 'POST', url, true ); |
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xhr.setRequestHeader( 'Content-Type', 'application/json' ); |
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xhr.setRequestHeader( 'X-WP-Nonce', CFG.nonce ); |
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xhr.send( payload ); |
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} catch ( e ) {} |
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} |
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} |
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|
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if ( document.readyState !== 'loading' ) { |
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sweep(); |
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} else { |
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document.addEventListener( 'DOMContentLoaded', sweep ); |
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} |
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window.addEventListener( 'load', function () { sweep(); schedule(); } ); |
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}() ); |
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|
