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<?php
/**
* Module Name: Asset CDN
* Module Description: Jetpack’s Site Accelerator loads your site faster by optimizing your images and serving your images and static files from our global network of servers.
* Sort Order: 26
* Recommendation Order: 1
* First Introduced: 6.6
* Requires Connection: No
* Auto Activate: No
* Module Tags: Photos and Videos, Appearance, Recommended
* Feature: Recommended, Appearance
* Additional Search Queries: site accelerator, accelerate, static, assets, javascript, css, files, performance, cdn, bandwidth, content delivery network, pagespeed, combine js, optimize css
*/
use Automattic\Jetpack\Assets;
$GLOBALS['concatenate_scripts'] = false;
Assets::add_resource_hint( '//c0.wp.com', 'dns-prefetch' );
class Jetpack_Photon_Static_Assets_CDN {
const CDN = 'https://c0.wp.com/';
/**
* Sets up action handlers needed for Jetpack CDN.
*/
public static function go() {
add_action( 'wp_print_scripts', array( __CLASS__, 'cdnize_assets' ) );
add_action( 'wp_print_styles', array( __CLASS__, 'cdnize_assets' ) );
add_action( 'admin_print_scripts', array( __CLASS__, 'cdnize_assets' ) );
add_action( 'admin_print_styles', array( __CLASS__, 'cdnize_assets' ) );
add_action( 'wp_footer', array( __CLASS__, 'cdnize_assets' ) );
add_filter( 'load_script_textdomain_relative_path', array( __CLASS__, 'fix_script_relative_path' ), 10, 2 );
add_filter( 'load_script_translation_file', array( __CLASS__, 'fix_local_script_translation_path' ), 10, 3 );
}
/**
* Sets up CDN URLs for assets that are enqueued by the WordPress Core.
*/
public static function cdnize_assets() {
global $wp_scripts, $wp_styles, $wp_version;
/*
* Short-circuit if AMP since not relevant as custom JS is not allowed and CSS is inlined.
* Note that it is not suitable to use the jetpack_force_disable_site_accelerator filter for this
* because it will be applied before the wp action, which is the point at which the queried object
* is available and we know whether the response will be AMP or not. This is particularly important
* for AMP-first (native AMP) pages where there are no AMP-specific URLs.
*/
if ( Jetpack_AMP_Support::is_amp_request() ) {
return;
}
/**
* Filters Jetpack CDN's Core version number and locale. Can be used to override the values
* that Jetpack uses to retrieve assets. Expects the values to be returned in an array.
*
* @module photon-cdn
*
* @since 6.6.0
*
* @param array $values array( $version = core assets version, i.e. 4.9.8, $locale = desired locale )
*/
list( $version, $locale ) = apply_filters(
'jetpack_cdn_core_version_and_locale',
array( $wp_version, get_locale() )
);
if ( self::is_public_version( $version ) ) {
$site_url = trailingslashit( site_url() );
foreach ( $wp_scripts->registered as $handle => $thing ) {
if ( wp_startswith( $thing->src, self::CDN ) ) {
continue;
}
$src = ltrim( str_replace( $site_url, '', $thing->src ), '/' );
if ( self::is_js_or_css_file( $src ) && in_array( substr( $src, 0, 9 ), array( 'wp-admin/', 'wp-includ' ) ) ) {
$wp_scripts->registered[ $handle ]->src = sprintf( self::CDN . 'c/%1$s/%2$s', $version, $src );
$wp_scripts->registered[ $handle ]->ver = null;
}
}
foreach ( $wp_styles->registered as $handle => $thing ) {
if ( wp_startswith( $thing->src, self::CDN ) ) {
continue;
}
$src = ltrim( str_replace( $site_url, '', $thing->src ), '/' );
if ( self::is_js_or_css_file( $src ) && in_array( substr( $src, 0, 9 ), array( 'wp-admin/', 'wp-includ' ) ) ) {
$wp_styles->registered[ $handle ]->src = sprintf( self::CDN . 'c/%1$s/%2$s', $version, $src );
$wp_styles->registered[ $handle ]->ver = null;
}
}
}
self::cdnize_plugin_assets( 'jetpack', JETPACK__VERSION );
if ( class_exists( 'WooCommerce' ) ) {
self::cdnize_plugin_assets( 'woocommerce', WC_VERSION );
}
}
/**
* Ensure use of the correct relative path when determining the JavaScript file names.
*
* @param string $relative The relative path of the script. False if it could not be determined.
* @param string $src The full source url of the script.
* @return string The expected relative path for the CDN-ed URL.
*/
public static function fix_script_relative_path( $relative, $src ) {
// Note relevant in AMP responses. See note above.
if ( Jetpack_AMP_Support::is_amp_request() ) {
return $relative;
}
$strpos = strpos( $src, '/wp-includes/' );
// We only treat URLs that have wp-includes in them. Cases like language textdomains
// can also use this filter, they don't need to be touched because they are local paths.
if ( false !== $strpos ) {
return substr( $src, 1 + $strpos );
}
// Get the local path from a URL which was CDN'ed by cdnize_plugin_assets().
if ( preg_match( '#^' . preg_quote( self::CDN, '#' ) . 'p/[^/]+/[^/]+/(.*)$#', $src, $m ) ) {
return $m[1];
}
return $relative;
}
/**
* Ensure use of the correct local path when loading the JavaScript translation file for a CDN'ed asset.
*
* @param string|false $file Path to the translation file to load. False if there isn't one.
* @param string $handle The script handle.
* @param string $domain The text domain.
*
* @return string The transformed local languages path.
*/
public static function fix_local_script_translation_path( $file, $handle, $domain ) {
global $wp_scripts;
// This is a rewritten plugin URL, so load the language file from the plugins path.
if ( $file && isset( $wp_scripts->registered[ $handle ] ) && wp_startswith( $wp_scripts->registered[ $handle ]->src, self::CDN . 'p' ) ) {
return WP_LANG_DIR . '/plugins/' . basename( $file );
}
return $file;
}
/**
* Sets up CDN URLs for supported plugin assets.
*
* @param String $plugin_slug plugin slug string.
* @param String $current_version plugin version string.
* @return null|bool
*/
public static function cdnize_plugin_assets( $plugin_slug, $current_version ) {
global $wp_scripts, $wp_styles;
/**
* Filters Jetpack CDN's plugin slug and version number. Can be used to override the values
* that Jetpack uses to retrieve assets. For example, when testing a development version of Jetpack
* the assets are not yet published, so you may need to override the version value to either
* trunk, or the latest available version. Expects the values to be returned in an array.
*
* @module photon-cdn
*
* @since 6.6.0
*
* @param array $values array( $slug = the plugin repository slug, i.e. jetpack, $version = the plugin version, i.e. 6.6 )
*/
list( $plugin_slug, $current_version ) = apply_filters(
'jetpack_cdn_plugin_slug_and_version',
array( $plugin_slug, $current_version )
);
$assets = self::get_plugin_assets( $plugin_slug, $current_version );
$plugin_directory_url = plugins_url() . '/' . $plugin_slug . '/';
if ( is_wp_error( $assets ) || ! is_array( $assets ) ) {
return false;
}
foreach ( $wp_scripts->registered as $handle => $thing ) {
if ( wp_startswith( $thing->src, self::CDN ) ) {
continue;
}
if ( wp_startswith( $thing->src, $plugin_directory_url ) ) {
$local_path = substr( $thing->src, strlen( $plugin_directory_url ) );
if ( in_array( $local_path, $assets, true ) ) {
$wp_scripts->registered[ $handle ]->src = sprintf( self::CDN . 'p/%1$s/%2$s/%3$s', $plugin_slug, $current_version, $local_path );
$wp_scripts->registered[ $handle ]->ver = null;
}
}
}
foreach ( $wp_styles->registered as $handle => $thing ) {
if ( wp_startswith( $thing->src, self::CDN ) ) {
continue;
}
if ( wp_startswith( $thing->src, $plugin_directory_url ) ) {
$local_path = substr( $thing->src, strlen( $plugin_directory_url ) );
if ( in_array( $local_path, $assets, true ) ) {
$wp_styles->registered[ $handle ]->src = sprintf( self::CDN . 'p/%1$s/%2$s/%3$s', $plugin_slug, $current_version, $local_path );
$wp_styles->registered[ $handle ]->ver = null;
}
}
}
}
/**
* Returns cdn-able assets for a given plugin.
*
* @param string $plugin plugin slug string.
* @param string $version plugin version number string.
* @return array|bool Will return false if not a public version.
*/
public static function get_plugin_assets( $plugin, $version ) {
if ( 'jetpack' === $plugin && JETPACK__VERSION === $version ) {
if ( ! self::is_public_version( $version ) ) {
return false;
}
$assets = array(); // The variable will be redefined in the included file.
include JETPACK__PLUGIN_DIR . 'modules/photon-cdn/jetpack-manifest.php';
return $assets;
}
/**
* Used for other plugins to provide their bundled assets via filter to
* prevent the need of storing them in an option or an external api request
* to w.org.
*
* @module photon-cdn
*
* @since 6.6.0
*
* @param array $assets The assets array for the plugin.
* @param string $version The version of the plugin being requested.
*/
$assets = apply_filters( "jetpack_cdn_plugin_assets-{$plugin}", null, $version );
if ( is_array( $assets ) ) {
return $assets;
}
if ( ! self::is_public_version( $version ) ) {
return false;
}
$cache = Jetpack_Options::get_option( 'static_asset_cdn_files', array() );
if ( isset( $cache[ $plugin ][ $version ] ) ) {
if ( is_array( $cache[ $plugin ][ $version ] ) ) {
return $cache[ $plugin ][ $version ];
}
if ( is_numeric( $cache[ $plugin ][ $version ] ) ) {
// Cache an empty result for up to 24h.
if ( (int) $cache[ $plugin ][ $version ] + DAY_IN_SECONDS > time() ) {
return array();
}
}
}
$url = sprintf( 'http://downloads.wordpress.org/plugin-checksums/%s/%s.json', $plugin, $version );
if ( wp_http_supports( array( 'ssl' ) ) ) {
$url = set_url_scheme( $url, 'https' );
}
$response = wp_remote_get( $url );
$body = trim( wp_remote_retrieve_body( $response ) );
$body = json_decode( $body, true );
$return = time();
if ( is_array( $body ) ) {
$return = array_filter( array_keys( $body['files'] ), array( __CLASS__, 'is_js_or_css_file' ) );
}
$cache[ $plugin ] = array();
$cache[ $plugin ][ $version ] = $return;
Jetpack_Options::update_option( 'static_asset_cdn_files', $cache, true );
return $return;
}
/**
* Checks a path whether it is a JS or CSS file.
*
* @param String $path file path.
* @return Boolean whether the file is a JS or CSS.
*/
public static function is_js_or_css_file( $path ) {
return ( false === strpos( $path, '?' ) ) && in_array( substr( $path, -3 ), array( 'css', '.js' ), true );
}
/**
* Checks whether the version string indicates a production version.
*
* @param String $version the version string.
* @param Boolean $include_beta_and_rc whether to count beta and RC versions as production.
* @return Boolean
*/
public static function is_public_version( $version, $include_beta_and_rc = false ) {
if ( preg_match( '/^\d+(\.\d+)+$/', $version ) ) {
// matches `1` `1.2` `1.2.3`.
return true;
} elseif ( $include_beta_and_rc && preg_match( '/^\d+(\.\d+)+(-(beta|rc|pressable)\d?)$/i', $version ) ) {
// matches `1.2.3` `1.2.3-beta` `1.2.3-pressable` `1.2.3-beta1` `1.2.3-rc` `1.2.3-rc2`.
return true;
}
// unrecognized version.
return false;
}
}
/**
* Allow plugins to short-circuit the Asset CDN, even when the module is on.
*
* @module photon-cdn
*
* @since 6.7.0
*
* @param false bool Should the Asset CDN be blocked? False by default.
*/
if ( true !== apply_filters( 'jetpack_force_disable_site_accelerator', false ) ) {
Jetpack_Photon_Static_Assets_CDN::go();
}