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<?php
namespace WP_Rocket\Engine\Cache\PurgeExpired;
use WP_Rocket\Buffer\Cache;
/**
* Purge expired cache files based on the defined lifespan
*
* @since 3.4
*/
class PurgeExpiredCache {
/**
* Path to the global cache folder.
*
* @since 3.4
*
* @var string
*/
private $cache_path;
/**
* Filesystem object.
*
* @since 3.4
*
* @var \WP_Filesystem_Direct
*/
private $filesystem;
/**
* Constructor
*
* @param string $cache_path Path to the global cache folder.
*/
public function __construct( $cache_path ) {
$this->cache_path = $cache_path;
}
/**
* Perform the event action.
*
* @since 3.4
*
* @param int $lifespan The cache lifespan in seconds.
*/
public function purge_expired_files( $lifespan ) {
if ( ! $lifespan ) {
// Uh?
return;
}
$urls = get_rocket_i18n_uri();
$file_age_limit = time() - $lifespan;
/**
* Filter home URLs that will be searched for old cache files.
*
* @since 3.4
*
* @param array $urls URLs that will be searched for old cache files.
* @param int $file_age_limit Timestamp of the maximum age files must have.
*/
$urls = apply_filters( 'rocket_automatic_cache_purge_urls', $urls, $file_age_limit );
if ( ! is_array( $urls ) ) {
// I saw what you did ಠ_ಠ.
$urls = get_rocket_i18n_uri();
}
$urls = array_filter( $urls, 'is_string' );
$urls = array_filter( $urls );
if ( ! $urls ) {
return;
}
$urls = array_unique( $urls );
if ( empty( $this->filesystem ) ) {
$this->filesystem = rocket_direct_filesystem();
}
$deleted = [];
$cache_enabled = Cache::can_generate_caching_files();
foreach ( $urls as $url ) {
/**
* Fires before purging a cache directory.
*
* @since 3.4
*
* @param string $url The home url.
* @param int $file_age_limit Timestamp of the maximum age files must have.
*/
do_action( 'rocket_before_automatic_cache_purge_dir', $url, $file_age_limit );
$url_deleted = [];
if ( $cache_enabled ) {
// Get the directory names.
$file = get_rocket_parse_url( $url );
/** This filter is documented in inc/front/htaccess.php */
if ( apply_filters( 'rocket_url_no_dots', false ) ) {
$file['host'] = str_replace( '.', '_', $file['host'] );
}
$sub_dir = rtrim( $file['path'], '/' );
$files = $this->get_cache_files_in_dir( $file );
foreach ( $files as $item ) {
$dir_path = $item->getPathname();
$sub_dir_path = $dir_path . $sub_dir;
// Time to cut old leaves.
$item_paths = $this->purge_dir( $sub_dir_path, $file_age_limit );
if ( $item_paths ) {
$url_deleted[] = [
'home_url' => $url,
'home_path' => $sub_dir_path,
'logged_in' => $dir_path !== $this->cache_path . $file['host'],
'files' => $item_paths,
];
}
if ( $this->is_dir_empty( $dir_path ) ) {
// If the folder is empty, remove it.
$this->filesystem->delete( $dir_path );
}
}
if ( $url_deleted ) {
$deleted = array_merge( $deleted, $url_deleted );
}
}
$args = [
'url' => $url,
'lifespan' => $lifespan,
'file_age_limit' => $file_age_limit,
];
/**
* Fires after a cache directory is purged.
*
* @since 3.4
*
* @param array $deleted {
* An array of arrays sharing the same home URL, described like: {
* @type string $home_url The home URL. This is the same as $args['url'].
* @type string $home_path Path to home.
* @type bool $logged_in True if the home path corresponds to a logged in user’s folder.
* @type array $files A list of paths of files that have been deleted.
* }
* Ex:
* [
* [
* 'home_url' => 'http://example.com/home1',
* 'home_path' => '/path-to/home1/wp-content/cache/wp-rocket/example.com/home1',
* 'logged_in' => false,
* 'files' => [
* '/path-to/home1/wp-content/cache/wp-rocket/example.com/home1/deleted-page',
* '/path-to/home1/wp-content/cache/wp-rocket/example.com/home1/very-dead-page',
* ],
* ],
* [
* 'home_url' => 'http://example.com/home1',
* 'home_path' => '/path-to/home1/wp-content/cache/wp-rocket/example.com-Greg-594d03f6ae698691165999/home1',
* 'logged_in' => true,
* 'files' => [
* '/path-to/home1/wp-content/cache/wp-rocket/example.com-Greg-594d03f6ae698691165999/home1/how-to-prank-your-coworkers',
* '/path-to/home1/wp-content/cache/wp-rocket/example.com-Greg-594d03f6ae698691165999/home1/best-source-of-gifs',
* ],
* ],
* ]
* @param array $args {
* @type string $url The home url.
* @type int $lifespan Files lifespan in seconds.
* @type int $file_age_limit Timestamp of the maximum age files must have. This is basically `time() - $lifespan`.
* }
*/
do_action( 'rocket_after_automatic_cache_purge_dir', $url_deleted, $args );
}
$args = [
'lifespan' => $lifespan,
'file_age_limit' => $file_age_limit,
];
/**
* Fires after cache directories are purged.
*
* @since 3.4
*
* @param array $deleted {
* An array of arrays, described like: {
* @type string $home_url The home URL.
* @type string $home_path Path to home.
* @type bool $logged_in True if the home path corresponds to a logged in user’s folder.
* @type array $files A list of paths of files that have been deleted.
* }
* Ex:
* [
* [
* 'home_url' => 'http://example.com/home1',
* 'home_path' => '/path-to/home1/wp-content/cache/wp-rocket/example.com/home1',
* 'logged_in' => false,
* 'files' => [
* '/path-to/home1/wp-content/cache/wp-rocket/example.com/home1/deleted-page',
* '/path-to/home1/wp-content/cache/wp-rocket/example.com/home1/very-dead-page',
* ],
* ],
* [
* 'home_url' => 'http://example.com/home1',
* 'home_path' => '/path-to/home1/wp-content/cache/wp-rocket/example.com-Greg-594d03f6ae698691165999/home1',
* 'logged_in' => true,
* 'files' => [
* '/path-to/home1/wp-content/cache/wp-rocket/example.com-Greg-594d03f6ae698691165999/home1/how-to-prank-your-coworkers',
* '/path-to/home1/wp-content/cache/wp-rocket/example.com-Greg-594d03f6ae698691165999/home1/best-source-of-gifs',
* ],
* ],
* [
* 'home_url' => 'http://example.com/home4',
* 'home_path' => '/path-to/home4/wp-content/cache/wp-rocket/example.com-Greg-71edg8d6af865569979569/home4',
* 'logged_in' => true,
* 'files' => [
* '/path-to/home4/wp-content/cache/wp-rocket/example.com-Greg-71edg8d6af865569979569/home4/easter-eggs-in-code-your-best-opportunities',
* ],
* ],
* ]
* }
* @param array $args {
* @type int $lifespan Files lifespan in seconds.
* @type int $file_age_limit Timestamp of the maximum age files must have. This is basically `time() - $lifespan`.
* }
*/
do_action( 'rocket_after_automatic_cache_purge', $deleted, $args );
}
/** ----------------------------------------------------------------------------------------- */
/** TOOLS =================================================================================== */
/** ----------------------------------------------------------------------------------------- */
/**
* Get all cache files for the provided URL
*
* @since 3.4
*
* @param array $file An array of the parsed URL parts.
* @return array|\CallbackFilterIterator
*/
private function get_cache_files_in_dir( $file ) {
// Grab cache folders.
$host_pattern = '@^' . preg_quote( $file['host'], '@' ) . '@';
$sub_dir = rtrim( $file['path'], '/' );
try {
$iterator = new \DirectoryIterator( $this->cache_path );
}
catch ( \Exception $e ) {
return [];
}
return new \CallbackFilterIterator(
$iterator,
function ( $current ) use ( $host_pattern, $sub_dir ) {
if ( ! $current->isDir() || $current->isDot() ) {
// We look for folders only, and don't want '.' nor '..'.
return false;
}
if ( ! preg_match( $host_pattern, $current->getFilename() ) ) {
// Not the right host.
return false;
}
if ( '' !== $sub_dir && ! $this->filesystem->exists( $current->getPathname() . $sub_dir ) ) {
// Not the right path.
return false;
}
return true;
}
);
}
/**
* Purge a folder from old files.
*
* @since 3.4
*
* @param string $dir_path Path to the folder to purge.
* @param int $file_age_limit Timestamp of the maximum age files must have.
* @return array A list of files that have been deleted.
*/
private function purge_dir( $dir_path, $file_age_limit ) {
$deleted = [];
try {
$iterator = new \DirectoryIterator( $dir_path );
}
catch ( \Exception $e ) {
return [];
}
foreach ( $iterator as $item ) {
if ( $item->isDot() ) {
continue;
}
if ( $item->isDir() ) {
/**
* A folder, let’s see what’s in there.
* Maybe there’s a dinosaur fossil or a hidden treasure.
*/
$dir_deleted = $this->purge_dir( $item->getPathname(), $file_age_limit );
$deleted = array_merge( $deleted, $dir_deleted );
} elseif ( $item->isFile() && $item->getMTime() < $file_age_limit ) {
$file_path = $item->getPathname();
/**
* The file is older than our limit.
* This will also delete the file if `$item->getMTime()` fails.
*/
if ( ! $this->filesystem->delete( $file_path ) ) {
continue;
}
/**
* A page can have multiple cache files:
* index(-mobile)(-https)(-dynamic-cookie-key){0,*}.html(_gzip).
*/
$dir_path = dirname( $file_path );
if ( ! in_array( $dir_path, $deleted, true ) ) {
$deleted[] = $dir_path;
}
}
}
if ( $this->is_dir_empty( $dir_path ) ) {
// If the folder is empty, remove it.
$this->filesystem->delete( $dir_path );
}
return $deleted;
}
/**
* Tell if a folder is empty.
*
* @since 3.4
*
* @param string $dir_path Path to the folder to purge.
* @return bool True if empty. False if it contains files.
*/
private function is_dir_empty( $dir_path ) {
try {
$iterator = new \DirectoryIterator( $dir_path );
}
catch ( \Exception $e ) {
return true;
}
foreach ( $iterator as $item ) {
if ( $item->isDot() ) {
continue;
}
return false;
}
return true;
}
/**
* Update lifespan option to convert old minutes to hours.
*
* @since 3.8
*
* @param int $old_lifespan Old value in minutes.
* @param int $old_lifespan_unit Old value of unit.
*
* @return void
*/
public function update_lifespan_value( $old_lifespan, $old_lifespan_unit ) {
if ( 'MINUTE_IN_SECONDS' !== $old_lifespan_unit ) {
return;
}
$options = get_option( 'wp_rocket_settings', [] );
if ( $old_lifespan > 0 && $old_lifespan < 60 ) {
$old_lifespan = 60;
}
$options['purge_cron_unit'] = 'HOUR_IN_SECONDS';
$options['purge_cron_interval'] = round( $old_lifespan / 60 );
update_option( 'wp_rocket_settings', $options );
}
}