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<?php
namespace Automattic\Jetpack_Boost\Lib\Minify;
use Automattic\Jetpack\Boost_Core\Lib\Cacheable;
/**
* Store the hash of the path string so that the concatenated file can be constructed
* on-demand.
*
* We are setting the transient for a long time because, if the content of the hash is not accessible, the concatenated file
* will not be able to construct itself. Because of page caching, there may be situations where this function will not
* get called for a long time, and we still want to serve the concatenated file in those cases. Having the value in
* a Boost Transient ensures that the value is cleaned up when Boost is uninstalled.
*/
final class File_Paths extends Cacheable {
private $paths;
private $mtime;
private $cache_buster;
protected const DEFAULT_EXPIRY = YEAR_IN_SECONDS;
public function set( $paths, $mtime, $cache_buster ) {
$this->paths = $paths;
$this->mtime = $mtime;
$this->cache_buster = $cache_buster;
}
public function jsonSerialize(): array {
return array(
'paths' => $this->paths,
'mtime' => $this->mtime,
'cache_buster' => $this->cache_buster,
);
}
/**
* Get an array of file paths that belong to the same hash.
*
* @return array Array of file paths relative to the webroot.
*/
public function get_paths() {
return $this->paths;
}
public static function jsonUnserialize( $data ) {
$instance = new self();
$instance->set( $data['paths'], $data['mtime'], $data['cache_buster'] );
return $instance;
}
protected function generate_cache_id() {
$hash = md5( implode( ',', $this->paths ) . '_' . $this->mtime . '_' . $this->cache_buster );
// Keep cache id small as option keys have a character limit.
return substr( $hash, 0, 10 );
}
protected static function cache_prefix() {
return 'concat_paths_';
}
}