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<?php |
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/** |
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* Plugin Name: Asset CDN |
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* Description: Speed up Javascript and CSS |
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* Plugin URI: https://github.com/automattic/jetpack |
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* Author: Automattic |
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* Author URI: https://automattic.com |
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* Version: 0.1.0 |
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* Text Domain: asset-cdn |
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* Domain Path: /languages/ |
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* License: GPLv2 or later |
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*/ |
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/** |
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* TODO |
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* - versioning (combine ver hashes) and cachebusting |
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* - concat/minify/serve JS too |
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* - asset inlining for smaller styles? |
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* - critical CSS support? |
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* - non-enqueued assets? |
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*/ |
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class Asset_CDN { |
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private static $__instance = null; |
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private $cdn_server; |
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private $concat_style_groups = array(); |
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/** |
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* Singleton implementation |
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* |
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* @return object |
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*/ |
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public static function instance() { |
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if ( ! is_a( self::$__instance, 'Asset_CDN' ) ) { |
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self::$__instance = new Asset_CDN(); |
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} |
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return self::$__instance; |
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} |
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private function __construct() { |
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$this->cdn_server = 'https://cdn.wpvm.io'; |
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// allow smaller CSS by only minifying assets on the page |
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add_filter( 'jetpack_implode_frontend_css', '__return_false' ); |
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// rewrite CSS tags |
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add_filter( 'style_loader_tag', array( $this, 'print_inline_styles' ), -100, 4 ); |
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add_action( 'wp_head', array( $this, 'render_concatenated_styles_head' ), PHP_INT_MAX ); |
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add_action( 'wp_footer', array( $this, 'render_concatenated_styles_footer' ), PHP_INT_MAX ); |
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} |
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/** |
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* Render functions |
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*/ |
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function render_concatenated_styles_head() { |
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if ( isset( $this->concat_style_groups[0] ) ) { |
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$this->render_concatenated_styles( $this->concat_style_groups[0] ); |
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} |
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} |
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function render_concatenated_styles_footer() { |
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if ( isset( $this->concat_style_groups[1] ) ) { |
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$this->render_concatenated_styles( $this->concat_style_groups[1] ); |
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} |
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} |
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private function render_concatenated_styles( $styles ) { |
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// special URL to concatenation service |
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foreach( $styles as $media => $urls ) { |
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$cdn_url = $this->cdn_server . '/css?b=' . urlencode( site_url() ) . '&' . http_build_query( array( 'f' => $urls ) ); |
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// if we are injecting critical CSS, load the full CSS async |
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if ( $this->inject_critical_css ) { |
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echo '<!-- jetpack concat --><link rel="preload" onload="this.rel=\'stylesheet\'" as="style" type="text/css" media="' . $media . '" href="' . esc_attr( $cdn_url ) . '"/>'; |
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} else { |
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echo '<!-- jetpack concat --><link rel="stylesheet" type="text/css" media="' . $media . '" href="' . esc_attr( $cdn_url ) . '"/>'; |
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} |
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} |
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} |
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/** |
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* Asset modification functions |
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*/ |
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public function print_inline_styles( $tag, $handle, $href, $media ) { |
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global $wp_styles; |
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// don't do admin for now |
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if ( is_admin() || ! isset( $wp_styles->registered[$handle] ) ) { |
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return $tag; |
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} |
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$style = $wp_styles->registered[$handle]; |
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if ( $this->should_concat_style( $style ) ) { |
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$this->buffer_style( $style ); |
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return ''; |
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} |
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return $tag; |
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} |
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private function buffer_style( $style ) { |
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$group = isset( $style->extra['group'] ) ? $style->extra['group'] : 0; |
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$media = $style->args; |
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if ( ! $media ) { |
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$media = 'all'; |
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} |
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if ( ! isset( $this->concat_style_groups[$group] ) ) { |
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$this->concat_style_groups[$group] = array(); |
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} |
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if ( ! isset( $this->concat_style_groups[$group][$media] ) ) { |
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$this->concat_style_groups[$group][$media] = array(); |
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} |
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$local_url = str_replace( untrailingslashit( site_url() ), '', $style->src ); |
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$this->concat_style_groups[$group][$media][] = $local_url; |
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} |
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private function should_concat_style( $style ) { |
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// only concat local styles |
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$is_local = $this->is_local_url( $style->src ); |
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// don't concat conditional styles |
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$is_conditional = isset( $style->extra['conditional'] ); |
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return apply_filters( 'jetpack_perf_concat_style', $is_local && ! $is_conditional, $style->handle, $style->src ); |
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} |
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private function is_local_url( $url ) { |
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$site_url = site_url(); |
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return ( strncmp( $url, '/', 1 ) === 0 && strncmp( $url, '//', 2 ) !== 0 ) |
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|| strpos( $url, $site_url ) === 0; |
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} |
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} |
Automattic /
jetpack
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