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<?php |
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/** |
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* TODO |
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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 Jetpack_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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private $concat_script_groups = array(); |
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private $inject_critical_css = false; |
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private $include_external_assets = false; |
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private $max_assets_per_tag = 1; |
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/** |
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* Singleton implementation |
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* |
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* @return object |
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*/ |
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public static function instance() { |
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if ( ! is_a( self::$__instance, 'Jetpack_Asset_CDN' ) ) { |
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self::$__instance = new Jetpack_Asset_CDN(); |
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} |
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return self::$__instance; |
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} |
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public static function reset() { |
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if ( null === self::$__instance ) { |
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return; |
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} |
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// allow smaller CSS by only minifying assets on the page |
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remove_filter( 'jetpack_implode_frontend_css', '__return_false' ); |
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// concatenate selected CSS and JS tags |
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remove_filter( 'script_loader_tag', array( self::$__instance, 'register_concat_scripts' ), -100 ); |
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remove_filter( 'style_loader_tag', array( self::$__instance, 'register_concat_styles' ), -100 ); |
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// render buffered assets |
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remove_action( 'wp_head', array( self::$__instance, 'render_concatenated_styles_head' ), PHP_INT_MAX ); |
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remove_action( 'wp_head', array( self::$__instance, 'render_concatenated_scripts_head' ), PHP_INT_MAX ); |
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remove_action( 'wp_footer', array( self::$__instance, 'render_concatenated_styles_footer' ), PHP_INT_MAX ); |
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remove_action( 'wp_footer', array( self::$__instance, 'render_concatenated_scripts_footer' ), PHP_INT_MAX ); |
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self::$__instance = null; |
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} |
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private function __construct() { |
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$this->cdn_server = apply_filters( 'jetpack_asset_cdn_url', 'https://cdn.wpvm.io' ); |
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$this->include_external_assets = apply_filters( 'jetpack_asset_cdn_external_assets', false ); |
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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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// concatenate selected CSS and JS tags |
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add_filter( 'script_loader_tag', array( $this, 'register_concat_scripts' ), -100, 3 ); |
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add_filter( 'style_loader_tag', array( $this, 'register_concat_styles' ), -100, 4 ); |
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// rewrite URLs for selected CSS and JS tags |
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add_filter( 'script_loader_src', array( $this, 'rewrite_script_src' ), -100, 2 ); |
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add_filter( 'style_loader_src', array( $this, 'rewrite_style_src' ), -100, 2 ); |
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// flush remaining un-printed CDN assets |
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add_action( 'wp_head', array( $this, 'render_concatenated_styles_head' ), PHP_INT_MAX ); |
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add_action( 'wp_head', array( $this, 'render_concatenated_scripts_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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add_action( 'wp_footer', array( $this, 'render_concatenated_scripts_footer' ), PHP_INT_MAX ); |
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} |
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/** |
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* Rewrite script or style src optionally, if not being concatenated, |
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* so they're still served from the CDN |
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*/ |
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View Code Duplication |
function rewrite_script_src( $src, $handle ) { |
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global $wp_scripts; |
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if ( is_admin() || ! isset( $wp_scripts->registered[$handle] ) ) { |
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return $src; |
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} |
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$script = $wp_scripts->registered[$handle]; |
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if ( ! $this->should_concat_script( $script ) && $this->should_cdn_script( $script ) ) { |
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// serve this script from the CDN |
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$parts = parse_url( $src ); |
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$url = $this->cdn_server . '/js'; |
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$url = add_query_arg( array( |
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'b' => "{$parts['scheme']}://{$parts['host']}", |
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'f' => array( $parts['path'] ), |
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'v' => array( $script->ver ) |
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), $url ); |
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return $url; |
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} |
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return $src; |
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} |
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function should_cdn_script( $script ) { |
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$should_cdn = ( $this->include_external_assets || $this->is_local_url( $script->src ) ); |
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return apply_filters( 'jetpack_perf_cdn_script', $should_cdn, $script->handle, $script->src ); |
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} |
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View Code Duplication |
function rewrite_style_src( $src, $handle ) { |
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global $wp_styles; |
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if ( is_admin() || ! isset( $wp_styles->registered[$handle] ) ) { |
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return $src; |
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} |
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$style = $wp_styles->registered[$handle]; |
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if ( ! $this->should_concat_style( $style ) && $this->should_cdn_style( $style ) ) { |
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// serve this style from the CDN |
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$parts = parse_url( $src ); |
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$url = $this->cdn_server . '/js'; |
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$url = add_query_arg( array( |
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'b' => "{$parts['scheme']}://{$parts['host']}", |
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'f' => array( $parts['path'] ), |
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'v' => array( $style->ver ) |
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), $url ); |
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return $url; |
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} |
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return $src; |
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} |
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function should_cdn_style( $style ) { |
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$should_cdn = ( $this->include_external_assets || $this->is_local_url( $style->src ) ); |
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return apply_filters( 'jetpack_perf_cdn_style', $should_cdn, $style->handle, $style->src ); |
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} |
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/** |
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* Render functions |
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*/ |
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function render_concatenated_styles_head() { |
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$this->flush_concatenated_styles(0); |
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} |
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function render_concatenated_styles_footer() { |
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$this->flush_concatenated_styles(0); |
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$this->flush_concatenated_styles(1); |
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} |
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private function flush_concatenated_styles( $group ) { |
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if ( ! isset( $this->concat_style_groups[ $group ] ) ) { |
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return; |
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} |
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$style_groups = $this->concat_style_groups[ $group ]; |
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if ( empty( $style_groups ) ) { |
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return; |
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} |
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// special URL to concatenation service |
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global $wp_styles; |
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$site_url = site_url(); |
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foreach( $style_groups as $media => $styles ) { |
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$urls = array(); |
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$vers = array(); |
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foreach( $styles as $style ) { |
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$urls[] = str_replace( untrailingslashit( $site_url ), '', $style->src ); |
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$vers[] = $style->ver ? $style->ver : $wp_styles->default_version; |
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} |
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$cdn_url = $this->cdn_server . '/css?b=' . |
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urlencode( $site_url ) . '&' . |
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http_build_query( array( 'f' => $urls ) ) . '&' . |
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http_build_query( array( 'v' => $vers ) ); |
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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 '<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 '<link rel="stylesheet" type="text/css" media="' . $media . '" href="' . esc_attr( $cdn_url ) . '"/>'; |
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} |
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foreach( $styles as $style ) { |
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if ( isset( $style->extra['concat-after'] ) && $style->extra['concat-after'] ) { |
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printf( "<style id='%s-inline-css' type='text/css'>\n%s\n</style>\n", esc_attr( $style->handle ), implode( "\n", $style->extra['concat-after'] ) ); |
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} |
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} |
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} |
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$this->concat_style_groups[ $group ] = array(); |
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} |
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function render_concatenated_scripts_head() { |
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$this->flush_concatenated_scripts( 0 ); |
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} |
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function render_concatenated_scripts_footer() { |
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$this->flush_concatenated_scripts( 0 ); // in case of late-enqueud header styles |
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$this->flush_concatenated_scripts( 1 ); |
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} |
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private function flush_concatenated_scripts( $group ) { |
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if ( ! isset( $this->concat_script_groups[ $group ] ) ) { |
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return; |
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} |
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$scripts = $this->concat_script_groups[ $group ]; |
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if ( empty( $scripts ) ) { |
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return; |
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} |
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global $wp_scripts; |
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$site_url = site_url(); |
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$urls = array(); |
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$vers = array(); |
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foreach( $scripts as $script ) { |
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$urls[] = str_replace( untrailingslashit( $site_url ), '', $script->src ); |
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$vers[] = $script->ver ? $script->ver : $wp_scripts->default_version; |
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if ( isset( $script->extra['before'] ) && $script->extra['before'] ) { |
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echo sprintf( "<script type='text/javascript'>\n%s\n</script>\n", $script->extra['before'] ); |
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} |
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} |
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$cdn_url = $this->cdn_server . '/js?b=' . |
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urlencode( $site_url ) . '&' . |
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http_build_query( array( 'f' => $urls ) ) . '&' . |
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http_build_query( array( 'v' => $vers ) ); |
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echo '<script type="text/javascript" src="' . esc_attr( $cdn_url ) . '"></script>'; |
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foreach( $scripts as $script ) { |
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if ( isset( $script->extra['after'] ) && $script->extra['after'] ) { |
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echo sprintf( "<script type='text/javascript'>\n%s\n</script>\n", $script->extra['after'] ); |
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} |
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} |
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$this->concat_script_groups[ $group ] = array(); |
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} |
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/** |
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* Asset modification functions |
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*/ |
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/** |
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* Scripts |
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*/ |
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public function register_concat_scripts( $tag, $handle, $src ) { |
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global $wp_scripts; |
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// don't do admin for now |
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if ( is_admin() || ! isset( $wp_scripts->registered[$handle] ) ) { |
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return $tag; |
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} |
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$script = $wp_scripts->registered[$handle]; |
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if ( $this->should_concat_script( $script ) ) { |
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$this->buffer_script( $script ); |
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return ''; |
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} |
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// we flush buffered scripts when we encounter a tag which |
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// is not eligible for concatenation, so that ordering is preserved |
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$group = isset( $script->extra['group'] ) ? $script->extra['group'] : 0; |
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$this->flush_concatenated_scripts( $group ); |
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return $tag; |
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} |
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private function should_concat_script( $script ) { |
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$should_concat = |
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( $this->include_external_assets || $this->is_local_url( $script->src ) ) |
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&& ! isset( $script->extra['conditional'] ); |
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return apply_filters( 'jetpack_perf_concat_script', $should_concat, $script->handle, $script->src ); |
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} |
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private function buffer_script( $script ) { |
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$group = isset( $script->extra['group'] ) ? $script->extra['group'] : 0; |
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if ( ! isset( $this->concat_script_groups[$group] ) ) { |
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$this->concat_script_groups[$group] = array(); |
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} |
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$this->concat_script_groups[$group][] = $script; |
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} |
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/** |
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* Styles |
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*/ |
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295
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296
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public function register_concat_styles( $tag, $handle, $href, $media ) { |
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297
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global $wp_styles; |
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298
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299
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// don't do admin for now |
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300
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|
if ( is_admin() || ! isset( $wp_styles->registered[$handle] ) ) { |
|
301
|
|
|
return $tag; |
|
302
|
|
|
} |
|
303
|
|
|
|
|
304
|
|
|
$style = $wp_styles->registered[$handle]; |
|
305
|
|
|
|
|
306
|
|
|
if ( $this->should_concat_style( $style ) ) { |
|
307
|
|
|
$this->buffer_style( $style ); |
|
308
|
|
|
return ''; |
|
309
|
|
|
} |
|
310
|
|
|
|
|
311
|
|
|
return $tag; |
|
312
|
|
|
} |
|
313
|
|
|
|
|
314
|
|
|
private function buffer_style( $style ) { |
|
315
|
|
|
$group = isset( $style->extra['group'] ) ? $style->extra['group'] : 0; |
|
316
|
|
|
$media = $style->args; |
|
317
|
|
|
|
|
318
|
|
|
// rename the 'after' code so that we can output it separately |
|
319
|
|
|
if ( isset( $style->extra['after'] ) ) { |
|
320
|
|
|
$style->extra['concat-after'] = $style->extra['after']; |
|
321
|
|
|
unset( $style->extra['after'] ); |
|
322
|
|
|
} |
|
323
|
|
|
|
|
324
|
|
|
if ( ! $media ) { |
|
325
|
|
|
$media = 'all'; |
|
326
|
|
|
} |
|
327
|
|
|
|
|
328
|
|
|
if ( ! isset( $this->concat_style_groups[$group] ) ) { |
|
329
|
|
|
$this->concat_style_groups[$group] = array(); |
|
330
|
|
|
} |
|
331
|
|
|
|
|
332
|
|
|
if ( ! isset( $this->concat_style_groups[$group][$media] ) ) { |
|
333
|
|
|
$this->concat_style_groups[$group][$media] = array(); |
|
334
|
|
|
} |
|
335
|
|
|
|
|
336
|
|
|
$this->concat_style_groups[$group][$media][] = $style; |
|
337
|
|
|
} |
|
338
|
|
|
|
|
339
|
|
|
private function should_concat_style( $style ) { |
|
340
|
|
|
$should_concat = |
|
341
|
|
|
( $this->include_external_assets || $this->is_local_url( $style->src ) ) |
|
342
|
|
|
&& ! isset( $style->extra['conditional'] ); |
|
343
|
|
|
|
|
344
|
|
|
return apply_filters( 'jetpack_perf_concat_style', $should_concat, $style->handle, $style->src ); |
|
345
|
|
|
} |
|
346
|
|
|
|
|
347
|
|
|
private function is_local_url( $url ) { |
|
348
|
|
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$site_url = site_url(); |
|
349
|
|
|
return ( strncmp( $url, '/', 1 ) === 0 && strncmp( $url, '//', 2 ) !== 0 ) |
|
350
|
|
|
|| strpos( $url, $site_url ) === 0; |
|
351
|
|
|
} |
|
352
|
|
|
} |
Automattic /
jetpack
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TODOcomments that have been left in the code.``TODO``s show that something is left unfinished and should be attended to.