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<?php
declare(strict_types=1);
namespace WP_Rocket\Engine\Optimization\DeferJS;
use WP_Rocket\Admin\Options_Data;
class DeferJS {
/**
* Options instance
*
* @var Options_Data
*/
private $options;
/**
* Array of inline exclusions list.
*
* @var string[]
*/
private $inline_exclusions = [
'DOMContentLoaded',
'document.write',
'window.lazyLoadOptions',
'N.N2_',
'rev_slider_wrapper',
'FB3D_CLIENT_LOCALE',
'ewww_webp_supported',
];
/**
* Instantiate the class
*
* @param Options_Data $options Options instance.
*/
public function __construct( Options_Data $options ) {
$this->options = $options;
}
/**
* Add the exclude defer JS option in WP Rocket options array
*
* @since 3.8
*
* @param array $options WP Rocket options array.
* @return array
*/
public function add_option( array $options ) : array {
$options['exclude_defer_js'] = [];
return $options;
}
/**
* Defer all JS files.
*
* @since 3.8
*
* @param string $html HTML content.
* @return string
*/
public function defer_js( string $html ) : string {
if ( ! $this->can_defer_js() ) {
return $html;
}
$buffer_nocomments = preg_replace( '/<!--(.*)-->/Uis', '', $html );
preg_match_all( '#<script\s+(?:[^>]+[\s\'"])?src\s*=\s*[\'"]\s*?(?<url>[^\'"]+)\s*?[\'"](?:[^>]+)?\/?>#i', $buffer_nocomments, $matches, PREG_SET_ORDER );
if ( empty( $matches ) ) {
return $html;
}
$exclude_defer_js = implode( '|', $this->get_excluded() );
foreach ( $matches as $tag ) {
if ( preg_match( '#(' . $exclude_defer_js . ')#i', $tag['url'] ) ) {
continue;
}
if ( preg_match( '/\s+(?:async|defer)/i', $tag[0] ) ) {
continue;
}
$deferred_tag = str_replace( '>', ' defer>', $tag[0] );
$html = str_replace( $tag[0], $deferred_tag, $html );
}
return $html;
}
/**
* Defers inline JS containing jQuery calls
*
* @since 3.8
*
* @param string $html HTML content.
* @return string
*/
public function defer_inline_js( string $html ) : string {
if ( ! $this->can_defer_js() ) {
return $html;
}
$exclude_defer_js = implode( '|', $this->get_excluded() );
if ( preg_match( '/(jquery(?:.*)?\.js)/i', $exclude_defer_js ) ) {
return $html;
}
$buffer_nocomments = preg_replace( '/<!--(.*)-->/Uis', '', $html );
preg_match_all( '#<script(?:[^>]*)>(?<content>[\s\S]*?)</script>#msi', $buffer_nocomments, $matches, PREG_SET_ORDER );
if ( empty( $matches ) ) {
return $html;
}
/**
* Filters the patterns used to find jQuery in inline JS
*
* @since 3.8
*
* @param string $jquery_patterns A RegEx pattern to find jQuery inline JS.
*/
$jquery_patterns = apply_filters( 'rocket_defer_jquery_patterns', 'jQuery|\$\.\(|\$\(' );
$inline_exclusions = $this->get_inline_exclusions_list_pattern();
foreach ( $matches as $inline_js ) {
if ( empty( $inline_js['content'] ) ) {
continue;
}
if ( preg_match( '/(application\/ld\+json)/i', $inline_js[0] ) ) {
continue;
}
if ( empty( $inline_exclusions ) || preg_match( "/({$inline_exclusions})/msi", $inline_js['content'] ) ) {
continue;
}
if ( ! empty( $jquery_patterns ) && ! preg_match( "/({$jquery_patterns})/msi", $inline_js['content'] ) ) {
continue;
}
$tag = str_replace( $inline_js['content'], $this->inline_js_wrapper( $inline_js['content'] ), $inline_js[0] );
$html = str_replace( $inline_js[0], $tag, $html );
}
return $html;
}
/**
* Adds the JS wrapper for inline jQuery code
*
* @since 3.8
*
* @param string $content Inline JS content.
* @return string
*/
private function inline_js_wrapper( string $content ) : string {
return "window.addEventListener('DOMContentLoaded', function() {" . $content . '});';
}
/**
* Checks if we can defer JS
*
* @since 3.8
*
* @return boolean
*/
private function can_defer_js() : bool {
if ( rocket_get_constant( 'DONOTROCKETOPTIMIZE' ) ) {
return false;
}
if ( ! $this->options->get( 'defer_all_js', 0 ) ) {
return false;
}
return ! is_rocket_post_excluded_option( 'defer_all_js' );
}
/**
* Get list of JS files to be excluded from defer JS.
*
* @since 3.8
*
* @return array
*/
public function get_excluded() : array {
$exclude_defer_js = [
'gist.github.com',
'content.jwplatform.com',
'js.hsforms.net',
'www.uplaunch.com',
'google.com/recaptcha',
'widget.reviews.co.uk',
'verify.authorize.net/anetseal',
'lib/admin/assets/lib/webfont/webfont.min.js',
'app.mailerlite.com',
'widget.reviews.io',
'simplybook.(.*)/v2/widget/widget.js',
'/wp-includes/js/dist/i18n.min.js',
'/wp-content/plugins/wpfront-notification-bar/js/wpfront-notification-bar(.*).js',
'/wp-content/plugins/oxygen/component-framework/vendor/aos/aos.js',
'/wp-content/plugins/ewww-image-optimizer/includes/check-webp(.min)?.js',
'static.mailerlite.com/data/(.*).js',
'cdn.voxpow.com/static/libs/v1/(.*).js',
'cdn.voxpow.com/media/trackers/js/(.*).js',
'use.typekit.net',
'www.idxhome.com',
'/wp-includes/js/dist/vendor/lodash(.min)?.js',
'/wp-includes/js/dist/api-fetch(.min)?.js',
'/wp-includes/js/dist/i18n(.min)?.js',
'/wp-includes/js/dist/vendor/wp-polyfill(.min)?.js',
'/wp-includes/js/dist/url(.min)?.js',
'/wp-includes/js/dist/hooks(.min)?.js',
'www.paypal.com/sdk/js',
];
$exclude_defer_js = array_unique( array_merge( $exclude_defer_js, $this->options->get( 'exclude_defer_js', [] ) ) );
/**
* Filter list of Deferred JavaScript files
*
* @since 2.10
*
* @param array $exclude_defer_js An array of URLs for the JS files to be excluded.
*/
$exclude_defer_js = apply_filters( 'rocket_exclude_defer_js', $exclude_defer_js );
foreach ( $exclude_defer_js as $i => $exclude ) {
$exclude_defer_js[ $i ] = str_replace( '#', '\#', $exclude );
}
return $exclude_defer_js;
}
/**
* Excludes jQuery from combine JS when defer and combine are enabled
*
* @since 3.8
*
* @param array $excluded_files Array of excluded files from combine JS.
* @return array
*/
public function exclude_jquery_combine( array $excluded_files ) : array {
if ( ! $this->can_defer_js() ) {
return $excluded_files;
}
if ( ! (bool) $this->options->get( 'minify_concatenate_js', 0 ) ) {
return $excluded_files;
}
$excluded_files[] = '/jquery-?[0-9.]*(.min|.slim|.slim.min)?.js';
return $excluded_files;
}
/**
* Adds jQuery to defer JS exclusion field if safe mode was enabled before 3.8
*
* @since 3.8
*
* @return void
*/
public function exclude_jquery_upgrade() {
$options = get_option( 'wp_rocket_settings' );
if ( ! isset( $options['defer_all_js_safe'] ) ) {
return;
}
if ( ! (bool) $options['defer_all_js_safe'] ) {
return;
}
$options['exclude_defer_js'][] = '/jquery-?[0-9.]*(.min|.slim|.slim.min)?.js';
update_option( 'wp_rocket_settings', $options );
}
/**
* Get exclusion list pattern.
*
* @return string
*/
private function get_inline_exclusions_list_pattern() {
$inline_exclusions_list = $this->inline_exclusions;
/**
* Filters the patterns used to find inline JS that should not be deferred
*
* @since 3.8
*
* @param array $inline_exclusions_list Array of inline JS that should not be deferred.
*/
$additional_inline_exclusions_list = apply_filters( 'rocket_defer_inline_exclusions', null );
$inline_exclusions = '';
// Check if filter return is string so convert it to array for backward compatibility.
if ( is_string( $additional_inline_exclusions_list ) ) {
$additional_inline_exclusions_list = explode( '|', $additional_inline_exclusions_list );
}
// Cast filter return to array.
$inline_exclusions_list = array_merge( $inline_exclusions_list, (array) $additional_inline_exclusions_list );
foreach ( $inline_exclusions_list as $inline_exclusions_item ) {
$inline_exclusions .= preg_quote( (string) $inline_exclusions_item, '#' ) . '|';
}
return rtrim( $inline_exclusions, '|' );
}
}
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