updated plugin W3 Total Cache version 2.5.0
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<?php
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/**
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* File: UserExperience_DeferScripts_Extension.php
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*
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* Controls the defer JS feature.
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*
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* @since 2.4.2
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*
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* @package W3TC
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*/
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namespace W3TC;
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/**
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* UserExperience DeferScripts Extension.
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*
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* @since 2.4.2
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*/
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class UserExperience_DeferScripts_Extension {
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/**
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* Config.
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*
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* @var object
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*/
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private $config;
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/**
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* Mutator.
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*
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* @var object
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*/
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private $mutator;
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/**
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* User Experience DeferScripts constructor.
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*
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* @since 2.4.2
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*/
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public function __construct() {
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$this->config = Dispatcher::config();
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}
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/**
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* Runs User Experience DeferScripts feature.
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*
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* @since 2.4.2
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*
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* @return void
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*/
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public function run() {
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if ( ! Util_Environment::is_w3tc_pro( $this->config ) ) {
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$this->config->set_extension_active_frontend( 'user-experience-defer-scripts', false );
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return;
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}
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Util_Bus::add_ob_callback( 'lazyload', array( $this, 'ob_callback' ) );
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add_filter( 'w3tc_minify_js_script_tags', array( $this, 'w3tc_minify_js_script_tags' ) );
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add_filter( 'w3tc_save_options', array( $this, 'w3tc_save_options' ) );
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add_action( 'w3tc_userexperience_page', array( $this, 'w3tc_userexperience_page' ) );
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/**
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* This filter is documented in Generic_AdminActions_Default.php under the read_request method.
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*/
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add_filter( 'w3tc_config_key_descriptor', array( $this, 'w3tc_config_key_descriptor' ), 10, 2 );
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}
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/**
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* Processes the page content buffer to defer JS.
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*
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* @since 2.4.2
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*
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* @param string $buffer page content buffer.
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*
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* @return string
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*/
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public function ob_callback( $buffer ) {
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if ( '' === $buffer || ! \W3TC\Util_Content::is_html_xml( $buffer ) ) {
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return $buffer;
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}
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$can_process = array(
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'enabled' => true,
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'buffer' => $buffer,
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'reason' => null,
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);
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$can_process = $this->can_process( $can_process );
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$can_process = apply_filters( 'w3tc_deferscripts_can_process', $can_process );
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// set reject reason in comment.
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if ( $can_process['enabled'] ) {
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$reject_reason = '';
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} else {
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$reject_reason = empty( $can_process['reason'] ) ? ' (not specified)' : ' (' . $can_process['reason'] . ')';
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}
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$buffer = str_replace(
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'{w3tc_deferscripts_reject_reason}',
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$reject_reason,
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$buffer
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);
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// processing.
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if ( ! $can_process['enabled'] ) {
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return $buffer;
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}
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$this->mutator = new UserExperience_DeferScripts_Mutator( $this->config );
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$buffer = $this->mutator->run( $buffer );
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// embed lazyload script.
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if ( $this->mutator->content_modified() ) {
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$buffer = apply_filters( 'w3tc_deferscripts_embed_script', $buffer );
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$is_embed_script = apply_filters( 'w3tc_deferscripts_is_embed_script', true );
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if ( $is_embed_script ) {
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$buffer = $this->embed_script( $buffer );
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}
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}
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return $buffer;
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}
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/**
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* Checks if the request can be processed for defer JS.
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*
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* @since 2.4.2
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*
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* @param boolean $can_process flag representing if defer JS can be executed.
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*
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* @return boolean
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*/
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private function can_process( $can_process ) {
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if ( defined( 'WP_ADMIN' ) ) {
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$can_process['enabled'] = false;
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$can_process['reason'] = 'WP_ADMIN';
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return $can_process;
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}
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if ( defined( 'SHORTINIT' ) && SHORTINIT ) {
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$can_process['enabled'] = false;
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$can_process['reason'] = 'SHORTINIT';
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return $can_process;
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}
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if ( function_exists( 'is_feed' ) && is_feed() ) {
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$can_process['enabled'] = false;
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$can_process['reason'] = 'feed';
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return $can_process;
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}
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return $can_process;
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}
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/**
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* Adds defer JS message to W3TC footer comment.
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*
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* @since 2.4.2
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*
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* @param array $strings array of W3TC footer comments.
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*
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* @return array
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*/
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public function w3tc_footer_comment( $strings ) {
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$strings[] = __( 'Defer Scripts', 'w3-total-cache' ) . '{w3tc_deferscripts_reject_reason}';
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return $strings;
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}
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/**
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* Embeds the defer JS script in buffer.
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*
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* @since 2.4.2
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*
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* @param string $buffer page content buffer.
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*
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* @return string
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*/
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private function embed_script( $buffer ) {
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$config_timeout = $this->config->get_integer(
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array(
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'user-experience-defer-scripts',
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'timeout',
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)
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);
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$content = file_get_contents( W3TC_DIR . '/UserExperience_DeferScripts_Script.js' );
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$content = str_replace(
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'{config_timeout}',
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$config_timeout,
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$content
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);
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$footer_script = '<script>' . $content . '</script>';
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$buffer = preg_replace(
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'~</body(\s+[^>]*)*>~Ui',
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$footer_script . '\\0',
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$buffer,
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1
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);
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return $buffer;
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}
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/**
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* Filters script tags that are flaged as deferred. This is used to prevent Minify from touching scripts deferred by this feature.
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*
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* @since 2.4.2
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*
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* @param array $script_tags array of script tags.
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*
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* @return array
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*/
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public function w3tc_minify_js_script_tags( $script_tags ) {
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if ( ! is_null( $this->mutator ) ) {
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$script_tags = $this->mutator->w3tc_minify_js_script_tags( $script_tags );
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}
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return $script_tags;
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}
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/**
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* Renders the user experience defer JS settings page.
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*
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* @since 2.4.2
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*
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* @return void
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*/
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public function w3tc_userexperience_page() {
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if ( Util_Environment::is_w3tc_pro( $this->config ) ) {
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include __DIR__ . '/UserExperience_DeferScripts_Page_View.php';
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}
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}
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/**
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* Specify config key typing for fields that need it.
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*
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* @since 2.4.2
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*
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* @param mixed $descriptor Descriptor.
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* @param mixed $key Compound key array.
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*
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* @return array
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*/
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public function w3tc_config_key_descriptor( $descriptor, $key ) {
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if ( is_array( $key ) && 'user-experience-defer-scripts.includes' === implode( '.', $key ) ) {
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$descriptor = array( 'type' => 'array' );
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}
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return $descriptor;
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}
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/**
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* Performs actions on save.
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*
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* @since 2.4.2
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*
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* @param array $data Array of save data.
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*
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* @return array
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*/
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public function w3tc_save_options( $data ) {
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$new_config = $data['new_config'];
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$old_config = $data['old_config'];
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if (
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$new_config->get_array( array( 'user-experience-defer-scripts', 'timeout' ) ) !== $old_config->get_array( array( 'user-experience-defer-scripts', 'timeout' ) )
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|| $new_config->get_array( array( 'user-experience-defer-scripts', 'includes' ) ) !== $old_config->get_array( array( 'user-experience-defer-scripts', 'includes' ) )
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) {
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$minify_enabled = $this->config->get_boolean( 'minify.enabled' );
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$pgcache_enabled = $this->config->get_boolean( 'pgcache.enabled' );
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if ( $minify_enabled || $pgcache_enabled ) {
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$state = Dispatcher::config_state();
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if ( $minify_enabled ) {
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$state->set( 'minify.show_note.need_flush', true );
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}
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if ( $pgcache_enabled ) {
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$state->set( 'common.show_note.flush_posts_needed', true );
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}
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$state->save();
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}
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}
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return $data;
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}
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}
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$o = new UserExperience_DeferScripts_Extension();
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$o->run();
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