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<?php
if ( ! defined( 'ABSPATH' ) ) {
exit; // Exit if accessed directly
}
/*
* Frontend logic: add script attribute & change Autoptimize JS attrib if applicable
*/
class AsyncJavaScriptFrontend {
function __construct() {
add_filter( 'script_loader_tag', array( $this, 'aj_async_js' ), 20, 3 );
add_filter( 'autoptimize_filter_js_defer', array( $this, 'aj_autoptimize_defer' ), 11 );
}
/**
* the plugin instance
*/
private static $instance = NULL;
/**
* get the plugin instance
*
* @return AsyncJavaScript
*/
public static function get_instance() {
if ( NULL === self::$instance ) {
self::$instance = new self();
}
return self::$instance;
}
/**
* aj_async_js()
*
* Main frontend function; adds 'async' or 'defer' attribute to '<script>' tasks called
* via wp_enqueue_script using the 'script_loader_tag' filter
*
*/
public function aj_async_js( $tag, $handle, $src ) {
if ( isset( $_GET['aj_simulate'] ) ) {
$aj_enabled = true;
$aj_method = sanitize_text_field( $_GET['aj_simulate'] );
if ( $aj_method !== 'async' && $aj_method !== 'defer' ) {
$aj_method = 'async';
}
if ( isset( $_GET['aj_simulate_jquery'] ) ) {
$aj_jquery = sanitize_text_field( $_GET['aj_simulate_jquery'] );
} else {
$aj_jquery = $aj_method;
}
$array_exclusions = array();
$array_async = array();
$array_defer = array();
$aj_plugin_exclusions = array();
$aj_theme_exclusions = array();
} else {
$aj_enabled = ( get_option( 'aj_enabled', 0 ) == 1 ) ? true : false;
$aj_method = ( get_option( 'aj_method', 'async' ) == 'async' ) ? 'async' : 'defer';
$aj_jquery = get_option( 'aj_jquery', 'async' );
$aj_jquery = ( $aj_jquery == 'same ' ) ? $aj_method : $aj_jquery;
$aj_exclusions = get_option( 'aj_exclusions', '' );
$array_exclusions = ( $aj_exclusions != '' ) ? explode( ',', $aj_exclusions ) : array();
$aj_async = get_option( 'aj_async', '' );
$array_async = ( $aj_async != '' ) ? explode( ',', $aj_async ) : array();
$aj_defer = get_option( 'aj_defer', '' );
$array_defer = ( $aj_defer != '' ) ? explode( ',', $aj_defer ) : array();
$aj_plugin_exclusions = get_option( 'aj_plugin_exclusions', array() );
$aj_theme_exclusions = get_option( 'aj_theme_exclusions', array() );
}
if ( false !== $aj_enabled && false !== $this->aj_shop() && false !== $this->aj_logged() && false === is_admin() && false === $this->aj_is_amp() && false === $this->aj_noptimize() ) {
if ( is_array( $aj_plugin_exclusions ) && !empty( $aj_plugin_exclusions ) ) {
foreach ( $aj_plugin_exclusions as $aj_plugin_exclusion ) {
$aj_plugin_exclusion = trim( $aj_plugin_exclusion );
if ( !empty( $aj_plugin_exclusion ) ) {
if ( false !== strpos( strtolower( $src ), strtolower( $aj_plugin_exclusion ) ) ) {
return $tag;
}
}
}
}
if ( is_array( $aj_theme_exclusions ) && !empty( $aj_theme_exclusions ) ) {
foreach ( $aj_theme_exclusions as $aj_theme_exclusion ) {
$aj_theme_exclusion = trim( $aj_theme_exclusion );
if ( !empty( $aj_theme_exclusion ) ) {
if ( false !== strpos( strtolower( $src ), strtolower( $aj_theme_exclusion ) ) ) {
return $tag;
}
}
}
}
if ( is_array( $array_exclusions ) && !empty( $array_exclusions ) ) {
foreach ( $array_exclusions as $exclusion ) {
$exclusion = trim( $exclusion );
if ( !empty( $exclusion ) ) {
if ( false !== strpos( strtolower( $src ), strtolower( $exclusion ) ) ) {
return $tag;
}
}
}
}
if ( false !== strpos( strtolower( $src ), 'js/jquery/jquery.js' ) ) {
if ( $aj_jquery == 'async' || $aj_jquery == 'defer' ) {
$tag = str_replace( 'src=', $aj_jquery . "='" . $aj_jquery . "' src=", $tag );
return $tag;
} else if ( $aj_jquery == 'exclude' ) {
return $tag;
}
}
if ( is_array( $array_async ) && !empty( $array_async ) ) {
foreach ( $array_async as $async ) {
$async = trim( $async );
if ( !empty( $async ) ) {
if ( false !== strpos( strtolower( $src ), strtolower( $async ) ) ) {
return str_replace( 'src=', "async='async' src=", $tag );
}
}
}
}
if ( is_array( $array_defer ) && !empty( $array_defer ) ) {
foreach ( $array_defer as $defer ) {
$defer = trim( $defer );
if ( !empty( $defer ) ) {
if ( false !== strpos( strtolower( $src ), strtolower( $defer ) ) ) {
return str_replace( 'src=', "defer='defer' src=", $tag );
}
}
}
}
$tag = str_replace( 'src=', $aj_method . "='" . $aj_method . "' src=", $tag );
return $tag;
}
return $tag;
}
/**
* aj_autoptimize_defer()
*
* Adds support for Autoptimize plugin. Adds 'async' attribute to '<script>' tasks called via autoptimize_filter_js_defer filter
* Autoptimize: https://wordpress.org/plugins/autoptimize/
*
*/
public function aj_autoptimize_defer( $defer ) {
$aj_enabled = ( get_option( 'aj_enabled', 0 ) == 1 ) ? true : false;
$aj_method = ( get_option( 'aj_method', 'async' ) == 'async' ) ? 'async' : 'defer';
$aj_autoptimize_enabled = ( get_option( 'aj_autoptimize_enabled', 0 ) == 1 ) ? true : false;
$aj_autoptimize_method = ( get_option( 'aj_autoptimize_method', 'async' ) == 'async' ) ? 'async' : 'defer';
if ( false !== $aj_enabled && false === is_admin() ) {
if ( false !== $aj_autoptimize_enabled ) {
return " " . $aj_autoptimize_method . "='" . $aj_autoptimize_method . "' ";
}
}
return $defer;
}
/**
* Returns true if given current page is AMP.
*
* @return bool
*/
public static function aj_is_amp()
{
if ( !function_exists('is_amp_endpoint') || !is_amp_endpoint() ) {
return false;
} else {
return true;
}
}
/**
* Returns true if aj_noptimize=1 was found in URL.
*
* @return bool
*/
public static function aj_noptimize()
{
$key = 'aj_noptimize';
if ( array_key_exists( $key, $_GET ) && '1' === $_GET[ $key ] ) {
$aj_noptimize = true;
} else {
$aj_noptimize = false;
}
$aj_noptimize = (bool) apply_filters( 'asyncjs_filter_noptimize', $aj_noptimize );
return $aj_noptimize;
}
/**
* Returns false if user is logged on and option was set to
* not async for logged on users, return true otherwise.
*
* @return bool
*/
public static function aj_logged()
{
static $_do_logged = null;
if ( is_null( $_do_logged ) ) {
$aj_enabled_logged = get_option( 'aj_enabled_logged', 0 );
if ( $aj_enabled_logged == 1 ) {
$_do_logged = true;
} else if ( is_user_logged_in() && current_user_can( 'edit_posts' ) ) {
$_do_logged = false;
} else {
$_do_logged = true;
}
}
return $_do_logged;
}
/**
* Returns false if user is on shop checkout/ cart page
* and option to async shop was not set, return true otherwise.
*
* @return bool
*/
public static function aj_shop()
{
static $_do_shop = null;
if ( is_null( $_do_shop ) ) {
$aj_enabled_shop = get_option( 'aj_enabled_shop', 0 );
$_do_shop = true;
if ( $aj_enabled_shop != 1 ) {
// Checking for woocommerce, easy digital downloads and wp ecommerce...
foreach ( array( 'is_checkout', 'is_cart', 'edd_is_checkout', 'wpsc_is_cart', 'wpsc_is_checkout' ) as $func ) {
if ( function_exists( $func ) && $func() ) {
$_do_shop = false;
break;
}
}
}
}
return $_do_shop;
}
}