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<?php

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namespace Smush\Core\CDN;

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use Smush\Core\Settings;

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use Smush\Core\Url_Utils;

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use WP_Smush;

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use WPMUDEV_Dashboard;

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class CDN_Helper {

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/**

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* Static instance

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* @var self

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private static $instance;

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/**

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* @var Settings

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private $settings;

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/**

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* Flag to check if CDN is active.

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* @var bool

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private $cdn_active;

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/**

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* @var bool|mixed

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private $status;

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/**

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* @var string

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private $cdn_base_url;

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/**

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* @var Url_Utils

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private $url_utils;

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private $is_pro;

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private $supported_extensions = array(

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'gif',

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'jpg',

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'jpeg',

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'png',

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'webp',

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);

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public function __construct() {

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$this->settings = Settings::get_instance();

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$this->url_utils = new Url_Utils();

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}

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private function is_url_extension_supported( $url ) {

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$extension = $this->url_utils->get_extension( $url );

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if ( ! $extension ) {

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return false;

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}

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return in_array( $extension, $this->supported_extensions, true );

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}

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private function is_url_scheme_supported( $url ) {

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$url_scheme = $this->url_utils->get_url_scheme( $url );

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return $url_scheme === 'http' || $url_scheme === 'https';

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}

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public function is_supported_url( $url ) {

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if (

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empty( trim( $url ) ) ||

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! $this->is_url_scheme_supported( $url ) ||

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! $this->is_url_extension_supported( $url )

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) {

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return false;

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}

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if ( str_starts_with( $url, content_url() ) ) {

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return true;

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}

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$uploads = $this->get_cdn_custom_uploads_dir();

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$base_url_available = isset( $uploads['baseurl'] );

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if ( $base_url_available && str_starts_with( $url, $uploads['baseurl'] ) ) {

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return true;

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}

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$mapped_domain = $this->check_mapped_domain();

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if ( $mapped_domain ) {

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$url = set_url_scheme( $url, 'http' );

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$mapped_domain = set_url_scheme( $mapped_domain, 'http' );

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return str_starts_with( $url, $mapped_domain );

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}

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return false;

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}

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/**

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* Support for domain mapping plugin.

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* @since 3.1.1

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private function check_mapped_domain() {

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if ( ! is_multisite() ) {

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return false;

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}

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if ( ! defined( 'DOMAINMAP_BASEFILE' ) ) {

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return false;

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}

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$domain = wp_cache_get( 'smush_mapped_site_domain', 'smush' );

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if ( ! $domain ) {

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global $wpdb;

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$domain = $wpdb->get_var(

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$wpdb->prepare(

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"SELECT domain FROM {$wpdb->base_prefix}domain_mapping WHERE blog_id = %d ORDER BY id LIMIT 1",

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get_current_blog_id()

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)

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); // Db call ok.

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if ( null !== $domain ) {

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wp_cache_add( 'smush_mapped_site_domain', $domain, 'smush' );

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}

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}

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return $domain;

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}

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private function get_cdn_custom_uploads_dir() {

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/**

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* There are chances for a custom uploads directory using UPLOADS constant.

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* But some security plugins (for example, WP Hide & Security Enhance) will allow replacing paths via Nginx/Apache

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* rules. So for this reason, we don't want the path to be replaced everywhere with the custom UPLOADS constant,

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* we just want to let the user redefine it here, in the CDN.

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* @param array $uploads {

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* Array of information about the upload directory.

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* @type string $path Base directory and subdirectory or full path to upload directory.

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* @type string $url Base URL and subdirectory or absolute URL to upload directory.

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* @type string $subdir Subdirectory if uploads use year/month folders option is on.

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* @type string $basedir Path without subdir.

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* @type string $baseurl URL path without subdir.

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* @type string|false $error False or error message.

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* }

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* Usage (replace /wp-content/uploads/ with /media/ directory):

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* add_filter(

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* 'smush_cdn_custom_uploads_dir',

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* function( $uploads ) {

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* $uploads['baseurl'] = 'https://example.com/media';

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* return $uploads;

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* }

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* );

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* @since 3.4.0

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return apply_filters( 'smush_cdn_custom_uploads_dir', wp_get_upload_dir() );

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}

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/**

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* Static instance getter

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public static function get_instance() {

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if ( empty( self::$instance ) ) {

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self::$instance = new self();

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}

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return self::$instance;

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}

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public function is_cdn_active() {

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if ( is_null( $this->cdn_active ) ) {

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$this->cdn_active = $this->check_is_cdn_active();

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}

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return $this->cdn_active;

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}

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private function check_is_cdn_active() {

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$status = $this->get_cdn_status();

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return isset( $status->cdn_enabled ) && $status->cdn_enabled;

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}

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/**

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* Only for tests, don't use in actual code

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public function set_cdn_active( $cdn_active ) {

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$this->cdn_active = $cdn_active;

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}

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public function get_cdn_status() {

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if ( is_null( $this->status ) ) {

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$this->status = $this->check_cdn_status();

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}

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return $this->status;

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}

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private function check_cdn_status() {

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// The CDN module needs to be active

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if ( ! $this->settings->is_cdn_active() ) {

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return false;

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}

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// All these are members only feature.

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if ( ! $this->is_pro() ) {

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return false;

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}

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// Disable CDN on staging.

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if ( $this->is_wpmudev_staging_environment() ) {

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return false;

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}

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// CDN is not enabled and not active.

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$status = $this->get_cdn_status_setting();

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if ( ! $status ) {

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return false;

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}

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return $status;

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}

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/**

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* Only for tests, don't use in actual code

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public function set_cdn_status( $cdn_status ) {

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$this->status = $cdn_status;

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}

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/**

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* @return bool

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private function is_wpmudev_staging_environment() {

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return isset( $_SERVER['WPMUDEV_HOSTING_ENV'] ) && 'staging' === $_SERVER['WPMUDEV_HOSTING_ENV'];

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}

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/**

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* @return bool

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private function is_pro() {

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if ( is_null( $this->is_pro ) ) {

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$this->is_pro = $this->check_if_pro();

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}

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return $this->is_pro;

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}

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/**

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* Only for tests, don't use in actual code

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public function set_is_pro( $is_pro ) {

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$this->is_pro = $is_pro;

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}

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private function check_if_pro() {

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/**

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* Do not allow enabling CDN for sites that are not registered on the Hub

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* Taken from 6e13e2f0

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return WP_Smush::is_pro()

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// CDN will not work if there is no dashboard plugin installed.

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&& class_exists( 'WPMUDEV_Dashboard' )

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// CDN will not work if site is not registered with the dashboard.

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&& WPMUDEV_Dashboard::$api->has_key();

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}

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public function get_cdn_base_url() {

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if ( is_null( $this->cdn_base_url ) ) {

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$this->cdn_base_url = $this->prepare_cdn_base_url();

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}

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return $this->cdn_base_url;

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}

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/**

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* @return bool|mixed

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public function get_cdn_status_setting() {

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return $this->settings->get_setting( 'wp-smush-cdn_status' );

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}

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private function prepare_cdn_base_url() {

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$status = $this->get_cdn_status();

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$site_id = absint( $status->site_id );

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return trailingslashit( "https://{$status->endpoint_url}/{$site_id}" );

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}

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public function get_cdn_status_string() {

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if ( ! $this->settings->is_cdn_active() ) {

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return 'disabled';

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}

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$cdn = $this->get_cdn_status_setting();

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if ( ! $cdn ) {

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return 'disabled';

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}

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if ( isset( $cdn->cdn_enabling ) && $cdn->cdn_enabling ) {

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return 'activating';

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}

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$plan = isset( $cdn->bandwidth_plan ) ? $cdn->bandwidth_plan : 10;

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$bandwidth = isset( $cdn->bandwidth ) ? $cdn->bandwidth : 0;

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$percentage = round( 100 * $bandwidth / 1024 / 1024 / 1024 / $plan );

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if ( $percentage > 100 || 100 === (int) $percentage ) {

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return 'overcap';

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} elseif ( 90 <= (int) $percentage ) {

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return 'upgrade';

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}

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return 'enabled';

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}

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/**

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* Generate CDN url from given image url.

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* @param string $src Image url.

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* @param array $args Query parameters.

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* @return string

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* @since 3.0

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public function generate_cdn_url( $original_url, $args = array() ) {

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// Do not continue in case we try this when cdn is disabled.

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if ( ! $this->is_cdn_active() ) {

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return $original_url;

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}

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/**

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* Filter hook to alter image src before going through cdn.

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* @param string $original_url Image src.

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* @see smush_image_src_before_cdn filter if you need earlier access with the image element.

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* @since 3.4.0

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$original_url = apply_filters( 'smush_filter_generate_cdn_url', $original_url );

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// Support for WP installs in subdirectories: remove the site url and leave only the file path.

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$path = str_replace( $this->get_site_url(), '', $original_url );

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// Parse url to get all parts.

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$url_parts = wp_parse_url( $path );

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// If path not found, do not continue.

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if ( empty( $url_parts['path'] ) ) {

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return $original_url;

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}

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$args = wp_parse_args( $this->get_cdn_parameters(), $args );

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// Replace base url with cdn base.

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$url = $this->get_cdn_base_url() . ltrim( $url_parts['path'], '/' );

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// Now we need to add our CDN parameters for resizing.

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return add_query_arg( $args, $url );

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}

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private function get_site_url() {

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$site_url = get_site_url();

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$home_url = get_home_url();

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if ( $site_url === $home_url ) {

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return $site_url;

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}

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$content_url = content_url();

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$root_url = trailingslashit( dirname( $content_url ) );

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if (

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false === strpos( $root_url, $site_url ) &&

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false !== strpos( $root_url, $home_url )

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) {

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$site_url = $home_url;

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}

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return $site_url;

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}

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private function get_cdn_parameters() {

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$webp_cdn = $this->settings->get( 'webp' );

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$lossy_level_setting = $this->settings->get_lossy_level_setting();

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$strip_exif = $this->settings->get( 'strip_exif' );

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return array(

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'lossy' => $lossy_level_setting,

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'strip' => (int) $strip_exif,

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'webp' => (int) $webp_cdn,

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);

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}

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/**

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* @param $image_markup

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* @return string|false String in the form of width x height e.g. "400x400" or false if it couldn't be guessed.

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public function guess_dimensions_from_image_markup( $image_markup ) {

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// Get registered image sizes.

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$image_sizes = WP_Smush::get_instance()->core()->image_dimensions();

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// Find the width and height attributes.

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$width = false;

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$height = false;

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// Try to get the width and height from img tag.

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if ( preg_match( '/width=["|\']?(\b[[:digit:]]+(?!%)\b)["|\']?/i', $image_markup, $width_string ) ) {

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$width = $width_string[1];

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}

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if ( preg_match( '/height=["|\']?(\b[[:digit:]]+(?!%)\b)["|\']?/i', $image_markup, $height_string ) ) {

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$height = $height_string[1];

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}

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$size = array();

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// Detect WP registered image size from HTML class.

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if ( preg_match( '/size-([^"\'\s]+)[^"\']*["|\']?/i', $image_markup, $size ) ) {

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$size = array_pop( $size );

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if ( ! array_key_exists( $size, $image_sizes ) ) {

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return false;

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}

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// This is probably a correctly sized thumbnail - no need to resize.

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if ( (int) $width === $image_sizes[ $size ]['width'] || (int) $height === $image_sizes[ $size ]['height'] ) {

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return false;

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}

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// If this size exists in registered sizes, add argument.

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if ( 'full' !== $size ) {

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return (int) $image_sizes[ $size ]['width'] . 'x' . (int) $image_sizes[ $size ]['height'];

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}

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} else {

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// It's not a registered thumbnail size.

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if ( $width && $height ) {

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return (int) $width . 'x' . (int) $height;

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}

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}

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return false;

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}

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public function set_settings( $settings ) {

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$this->settings = $settings;

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}

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public function skip_image( $url, $image_markup ) {

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return apply_filters( 'smush_skip_image_from_cdn', false, $url, $image_markup );

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}

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}

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