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<?php
declare(strict_types=1);
namespace WP_Rocket\Engine\Optimization\RUCSS\Warmup;
use WP_Rocket\Engine\Optimization\AssetsLocalCache;
use WP_Rocket\Engine\Optimization\CSSTrait;
use WP_Rocket\Engine\Optimization\RegexTrait;
use WP_Rocket\Engine\Optimization\UrlTrait;
use WP_Rocket\Logger\Logger;
use WP_Rocket_WP_Async_Request;
use WP_Rocket\Admin\Options;
class ResourceFetcher extends WP_Rocket_WP_Async_Request {
use RegexTrait, UrlTrait;
/**
* Regex for stylesheets
*/
const LINK_PATTERN = '<link\s+(?:[^>]+[\s"\'])?href\s*=\s*[\'"]\s*(?<url>[^\'"\s]+)\s*?[\'"](?:[^>]+)?\/?>';
/**
* Regex for scripts.
*/
const SCRIPT_PATTERN = '<script\s+(?:[^>]+[\s\'"])?src\s*=\s*[\'"]\s*?(?<url>[^\'"\s]+)\s*?[\'"](?:[^>]+)?\/?>';
/**
* Prefix
*
* @var string
*/
protected $prefix = 'rocket';
/**
* Action
*
* @var string
*/
protected $action = 'saas_warmup';
/**
* Resources array.
*
* @var array
*/
private $resources = [];
/**
* Assets local cache instance
*
* @var AssetsLocalCache
*/
private $local_cache;
/**
* Resource fetcher process instance.
*
* @var ResourceFetcherProcess
*/
private $process;
/**
* Excluded stylesheets patterns.
*
* @var string[]
*/
private $excluded_stylesheets = [
'//fonts.googleapis.com/css',
];
/**
* Options API instance.
*
* @var Options
*/
private $options_api;
/**
* ResourceFetcherProcess constructor.
*
* @param AssetsLocalCache $local_cache Local cache instance.
* @param ResourceFetcherProcess $process Resource fetcher process instance.
* @param Options $options_api Options API instance.
*/
public function __construct( AssetsLocalCache $local_cache, ResourceFetcherProcess $process, Options $options_api ) {
parent::__construct();
$this->local_cache = $local_cache;
$this->process = $process;
$this->options_api = $options_api;
}
/**
* Handle Collecting resources and save them into the DB
*
* @since 3.9
*
* @return void
*/
public function handle() {
// Grab resources from page HTML.
$html = ! empty( $_POST['html'] ) ? wp_unslash( $_POST['html'] ) : ''; // phpcs:ignore WordPress.Security.NonceVerification.Missing, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
$is_error = ! empty( $_POST['is_error'] ) ? (bool) $_POST['is_error'] : false; // phpcs:ignore WordPress.Security.NonceVerification.Missing, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
$page_url = ! empty( $_POST['page_url'] ) ? esc_url_raw( wp_unslash( $_POST['page_url'] ) ) : ''; // phpcs:ignore WordPress.Security.NonceVerification.Missing
$html = $this->decompress( $html );
if ( empty( $html ) ) {
$is_error = true;
}
$this->find_resources( $html, 'js' );
$this->find_resources( $html, 'css' );
if ( empty( $this->resources ) ) {
$is_error = true;
}
// Send pages with error to background process to be saved into DB.
if ( $is_error ) {
$resource = [];
$resource['prewarmup'] = (int) ! empty( $_POST['prewarmup'] );// phpcs:ignore WordPress.Security.NonceVerification.Missing
$resource['page_url'] = $page_url;
$resource['is_error'] = $is_error;
$this->process->push_to_queue( $resource );
}
// Send resources to the background process to be saved into DB.
foreach ( $this->resources as $resource ) {
$resource['prewarmup'] = (int) ! empty( $_POST['prewarmup'] );// phpcs:ignore WordPress.Security.NonceVerification.Missing
$resource['page_url'] = $page_url;
$resource['is_error'] = $is_error;
$this->process->push_to_queue( $resource );
}
$this->process->save()->dispatch();
}
/**
* Find resources of type (css/js) on the page HTML.
*
* @since 3.9
*
* @param string $html Page HTML.
* @param string $type Specify to look for 'css' or 'js' resources.
*
* @return void
*/
private function find_resources( string $html, string $type ) {
$pattern = ( 'css' === $type ) ? self::LINK_PATTERN : self::SCRIPT_PATTERN;
$resources = $this->find( $pattern, $html );
if ( empty( $resources ) ) {
return;
}
foreach ( $resources as $resource ) {
if ( 'css' === $type && ! $this->is_valid_stylesheet( $resource[0] ) ) {
continue;
}
if ( 'js' === $type && ! $this->is_valid_script( $resource[0] ) ) {
continue;
}
$external_url = $this->is_external_file( $resource['url'] );
$path = $this->get_url_path( $resource['url'], $external_url );
$this->resources[ $path ] = [
'url' => $this->normalize_fullurl( $resource['url'], false ),
'type' => $type,
'path' => $path,
'external' => $external_url,
];
if ( 'css' === $type ) {
$this->resources[ $path ]['media'] = $this->get_stylesheet_media( $resource[0] );
}
}
}
/**
* Check that a link element is a stylesheet.
*
* @since 3.9
*
* @param string $link The link element to check.
*
* @return bool True for stylesheet; false for anything else.
*/
private function is_valid_stylesheet( string $link ) : bool {
$valid_rel = $this->find( '(?:rel=[\'"]stylesheet[\'"])', $link, 'is' );
if ( empty( $valid_rel ) ) {
return false;
}
$exclusions = '';
foreach ( $this->excluded_stylesheets as $excluded_item ) {
$exclusions .= preg_quote( $excluded_item, '/' ) . '|';
}
$excluded = $this->find( rtrim( $exclusions, '|' ), $link );
if ( ! empty( $excluded ) ) {
return false;
}
return true;
}
/**
* Check if script is valid.
*
* @since 3.9
*
* @param string $script Script tag to be validated.
*
* @return bool
*/
private function is_valid_script( string $script ) : bool {
return ! preg_match( '/(application\/ld\+json)|(application\/json)/i', $script );
}
/**
* Get media attribute from stylesheet.
*
* @param string $link Link HTML tag.
*
* @return string
*/
private function get_stylesheet_media( string $link ) : string {
if (
! preg_match( '/media\s*=\s*[\'"](?<media>.*)[\'"]/iUs', $link, $media_matches )
||
! isset( $media_matches['media'] )
) {
return 'all';
}
return $media_matches['media'];
}
/**
* Get url file path.
*
* @param string $url File url.
* @param bool $external_url Is external url (true) or internal (false).
*
* @return string
*/
private function get_url_path( $url, bool $external_url ) : string {
$file_path = $external_url ? $this->local_cache->get_filepath( $url ) : $this->get_file_path( $url );
if ( empty( $file_path ) ) {
Logger::error(
'Couldn’t get the file path from the URL.',
[
'RUCSS warmup process',
'url' => $url,
]
);
return md5( uniqid() );
}
return $file_path;
}
/**
* Gets the CDN zones.
*
* @return array
*/
public function get_zones() : array {
return [ 'all', 'css_and_js' ];
}
/**
* Compress the HTML data before sending it to the resources fetcher
*
* @since 3.9.2
*
* @param string $data HTML data.
*
* @return string
*/
public function compress( string $data ): string {
if ( ! function_exists( 'gzencode' ) ) {
return $data;
}
if ( empty( $data ) ) {
return '';
}
$compressed = gzencode( $data, apply_filters( 'rocket_gzencode_level_compression', 6 ) );
if ( false === $compressed ) {
return $data;
}
return $compressed;
}
/**
* Decompress the HTML data received by the resources fetcher
*
* @since 3.9.2
*
* @param string $data Compressed HTML data.
*
* @return string
*/
private function decompress( string $data ): string {
if ( ! function_exists( 'gzdecode' ) ) {
return $data;
}
if ( empty( $data ) ) {
return '';
}
$decompressed = @gzdecode( $data ); // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
if ( false === $decompressed ) {
return $data;
}
return $decompressed;
}
/**
* Cancel resource fetcher process
*
* @since 3.10
*
* @return void
*/
public function cancel_resource_fetcher_process() {
$this->process->cancel_process();
}
}
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