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<?php
namespace WPForms\Helpers;
/**
* Remote data cache handler.
*
* Usage example in `WPForms\Admin\Addons\AddonsCache` and `WPForms\Admin\Builder\TemplatesCache`.
*
* @since 1.6.8
*/
abstract class CacheBase {
/**
* Indicates whether the cache was updated during the current run.
*
* @since 1.6.8
*
* @var bool
*/
private static $updated = false;
/**
* Settings.
*
* @since 1.6.8
*
* @var array
*/
protected $settings;
/**
* Determine if the class is allowed to load.
*
* @since 1.6.8
*
* @return bool
*/
abstract protected function allow_load();
/**
* Initialize.
*
* @since 1.6.8
*/
public function init() {
if ( ! $this->allow_load() ) {
return;
}
$this->update_settings();
// Quit if settings didn't provided.
if (
empty( $this->settings['remote_source'] ) ||
empty( $this->settings['cache_file'] )
) {
return;
}
$this->hooks();
}
/**
* Base hooks.
*
* @since 1.6.8
*/
private function hooks() {
add_action( 'shutdown', [ $this, 'cache_dir_complete' ] );
if ( empty( $this->settings['update_action'] ) ) {
return;
}
// Schedule recurring updates.
add_action( 'admin_init', [ $this, 'schedule_update_cache' ] );
add_action( $this->settings['update_action'], [ $this, 'update_cache' ] );
}
/**
* Set up settings.
*
* @since 1.6.8
*/
private function update_settings() {
$default_settings = [
// Remote source URL.
// For instance: 'https://wpforms.com/wp-content/addons.json'.
'remote_source' => '',
// Cache file.
// Just file name. For instance: 'addons.json'.
'cache_file' => '',
// Cache time to live in seconds.
'cache_ttl' => WEEK_IN_SECONDS,
// Scheduled update action.
// For instance: 'wpforms_admin_addons_cache_update'.
'update_action' => '',
];
$this->settings = wp_parse_args( $this->setup(), $default_settings );
}
/**
* Provide settings.
*
* @since 1.6.8
*
* @return array Settings array.
*/
abstract protected function setup();
/**
* Get cache directory path.
*
* @since 1.6.8
*/
protected function get_cache_dir() {
$upload_dir = wpforms_upload_dir();
$upload_path = ! empty( $upload_dir['path'] )
? trailingslashit( wp_normalize_path( $upload_dir['path'] ) )
: trailingslashit( WP_CONTENT_DIR ) . 'uploads/wpforms/';
return $upload_path . 'cache/';
}
/**
* Get cached data.
*
* @since 1.6.8
*
* @return array Cached data.
*/
public function get_cached() {
$cache_modified_time = 0;
$current_time = time();
$cache_file = $this->get_cache_dir() . $this->settings['cache_file'];
if ( is_file( $cache_file ) && is_readable( $cache_file ) ) {
clearstatcache( true, $cache_file );
$cache_modified_time = (int) filemtime( $cache_file );
$data = json_decode( file_get_contents( $cache_file ), true );
}
if (
! empty( $data ) &&
$cache_modified_time + $this->settings['cache_ttl'] > $current_time
) {
return $data;
}
// This code should execute when the method was called for the first time,
// Next update_cache() should be executed as scheduled.
// Also, we will try to update the cache only if the latest unsuccessful try has been 10 (or more) minutes ago.
if ( $cache_modified_time + 600 < $current_time ) {
return $this->update_cache();
}
return [];
}
/**
* Update cached data with actual data retrieved from the remote source.
*
* @since 1.6.8
*
* @return array
*/
public function update_cache() {
$request = wp_remote_get( $this->settings['remote_source'] );
if ( is_wp_error( $request ) ) {
return [];
}
$json = wp_remote_retrieve_body( $request );
if ( empty( $json ) ) {
return [];
}
$data = $this->prepare_cache_data( json_decode( $json, true ) );
$dir = $this->get_cache_dir();
// Just return the data if can't create the cache directory.
if ( ! wp_mkdir_p( $dir ) ) {
return $data;
}
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_read_file_put_contents
file_put_contents(
$dir . $this->settings['cache_file'],
wp_json_encode( $data )
);
self::$updated = true;
return $data;
}
/**
* Schedule updates.
*
* @since 1.6.8
*/
public function schedule_update_cache() {
// Just skip if not need to register scheduled action.
if ( empty( $this->settings['update_action'] ) ) {
return;
}
$tasks = wpforms()->get( 'tasks' );
if ( $tasks->is_scheduled( $this->settings['update_action'] ) !== false ) {
return;
}
$tasks->create( $this->settings['update_action'] )
->recurring( time() + $this->settings['cache_ttl'], $this->settings['cache_ttl'] )
->params()
->register();
}
/**
* Complete the cache directory.
*
* @since 1.6.8
*/
public function cache_dir_complete() {
if ( ! self::$updated ) {
return;
}
wpforms_create_upload_dir_htaccess_file();
wpforms_create_index_html_file( $this->get_cache_dir() );
}
/**
* Prepare data to store in a local cache.
*
* @since 1.6.8
*
* @param array $data Raw data received by the remote request.
*
* @return array Prepared data for caching.
*/
protected function prepare_cache_data( $data ) {
if ( empty( $data ) || ! is_array( $data ) ) {
return [];
}
return $data;
}
}