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<?php
namespace WP_Rocket\Engine\Optimization;
use WP_Filesystem_Direct;
/**
* Cache locally 3rd party assets.
*
* @since 3.1
*/
class AssetsLocalCache {
/**
* 3rd party assets cache folder path
*
* @since 3.1
*
* @var string
*/
protected $cache_path;
/**
* Filesystem instance.
*
* @var WP_Filesystem_Direct
*/
private $filesystem;
/**
* Cache contents with url.
*
* @var array
*/
private $url_cache = [];
/**
* Constructor
*
* @since 3.1
*
* @param string $cache_path 3rd party assets cache folder path.
* @param WP_Filesystem_Direct $filesystem Filesysten instance.
*/
public function __construct( $cache_path, $filesystem ) {
$this->cache_path = "{$cache_path}3rd-party/";
$this->filesystem = $filesystem;
}
/**
* Get remote file contents.
*
* @param string $url Url of the file to get contents for.
*
* @return string Raw file contents.
*/
private function get_raw_content( $url ) {
$cache_key = md5( $url );
if ( ! isset( $this->url_cache[ $cache_key ] ) ) {
$this->url_cache[ $cache_key ] = wp_remote_retrieve_body( wp_remote_get( $url ) );
}
return $this->url_cache[ $cache_key ];
}
/**
* Gets content for the provided URL.
* Use the local cache file if it exists, else get it from the 3rd party URL and save it locally for future use.
*
* @since 3.1
*
* @param string $url URL to get the content from.
*
* @return string
*/
public function get_content( $url ) {
$filepath = $this->get_filepath( $url );
if ( empty( $filepath ) ) {
return '';
}
if ( $this->filesystem->is_readable( $filepath ) ) {
return $this->filesystem->get_contents( $filepath );
}
$content = $this->get_raw_content( $url );
if ( empty( $content ) ) {
return '';
}
$this->write_file( $content, $filepath );
return $content;
}
/**
* Gets the filepath of the local copy for the given URL
*
* @since 3.7
*
* @param string $url URL to get filepath for.
* @return string
*/
public function get_filepath( $url ) {
$parts = wp_parse_url( $url );
if ( empty( $parts['path'] ) ) {
return '';
}
$filename = $parts['host'] . str_replace( '/', '-', $parts['path'] );
return $this->cache_path . $filename;
}
/**
* Writes the content to a file
*
* @since 3.1
*
* @param string $content Content to write.
* @param string $file Path to the file to write in.
* @return bool
*/
protected function write_file( $content, $file ) {
if ( $this->filesystem->is_readable( $file ) ) {
return true;
}
if ( ! rocket_mkdir_p( dirname( $file ) ) ) {
return false;
}
return rocket_put_content( $file, $content );
}
/**
* Check if this link HTML has integrity attribute or not?
*
* @since 3.7.5
*
* @param string $asset Link HTML to be tested.
*
* @return array|false Matched array with integrityhashmethod, integrityhash keys.
*/
private function has_integrity( $asset ) {
if ( ! preg_match( '#\s*integrity\s*=[\'"](?<integrityhashmethod>.*)-(?<integrityhash>.*)[\'"]#Ui', $asset, $integrity_matches ) ) {
return false;
}
if ( ! isset( $integrity_matches['integrityhashmethod'], $integrity_matches['integrityhash'] ) ) {
return false;
}
return $integrity_matches;
}
/**
* Validate the integrity attribute if the content matches with the hashed integrity value.
*
* @param array $asset_matched the matched array which has 0, url keys.
*
* @return bool|string
*/
public function validate_integrity( $asset_matched ) {
$integrity_matches = $this->has_integrity( $asset_matched[0] );
if ( false === $integrity_matches ) {
return $asset_matched[0];
}
// validate the hash algorithm.
if ( ! in_array( $integrity_matches['integrityhashmethod'], hash_algos(), true ) ) {
return false;
}
$content = $this->get_raw_content( $asset_matched['url'] );
$content_hash = base64_encode( hash( $integrity_matches['integrityhashmethod'], $content, true ) );// phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode
if ( $integrity_matches['integrityhash'] !== $content_hash ) {
return false;
}
return str_replace( $integrity_matches[0], '', $asset_matched[0] );
}
}
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