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<?php
/**
* Constants sync module.
*
* @package automattic/jetpack-sync
*/
namespace Automattic\Jetpack\Sync\Modules;
use Automattic\Jetpack\Sync\Defaults;
/**
* Class to handle sync for constants.
*/
class Constants extends Module {
/**
* Name of the constants checksum option.
*
* @var string
*/
const CONSTANTS_CHECKSUM_OPTION_NAME = 'jetpack_constants_sync_checksum';
/**
* Name of the transient for locking constants.
*
* @var string
*/
const CONSTANTS_AWAIT_TRANSIENT_NAME = 'jetpack_sync_constants_await';
/**
* Sync module name.
*
* @access public
*
* @return string
*/
public function name() {
return 'constants';
}
/**
* Initialize constants action listeners.
*
* @access public
*
* @param callable $callable Action handler callable.
*/
public function init_listeners( $callable ) {
add_action( 'jetpack_sync_constant', $callable, 10, 2 );
}
/**
* Initialize constants action listeners for full sync.
*
* @access public
*
* @param callable $callable Action handler callable.
*/
public function init_full_sync_listeners( $callable ) {
add_action( 'jetpack_full_sync_constants', $callable );
}
/**
* Initialize the module in the sender.
*
* @access public
*/
public function init_before_send() {
add_action( 'jetpack_sync_before_send_queue_sync', array( $this, 'maybe_sync_constants' ) );
// Full sync.
add_filter( 'jetpack_sync_before_send_jetpack_full_sync_constants', array( $this, 'expand_constants' ) );
}
/**
* Perform module cleanup.
* Deletes any transients and options that this module uses.
* Usually triggered when uninstalling the plugin.
*
* @access public
*/
public function reset_data() {
delete_option( self::CONSTANTS_CHECKSUM_OPTION_NAME );
delete_transient( self::CONSTANTS_AWAIT_TRANSIENT_NAME );
}
/**
* Set the constants whitelist.
*
* @access public
* @todo We don't seem to use this one. Should we remove it?
*
* @param array $constants The new constants whitelist.
*/
public function set_constants_whitelist( $constants ) {
$this->constants_whitelist = $constants;
}
/**
* Get the constants whitelist.
*
* @access public
*
* @return array The constants whitelist.
*/
public function get_constants_whitelist() {
return Defaults::get_constants_whitelist();
}
/**
* Enqueue the constants actions for full sync.
*
* @access public
*
* @param array $config Full sync configuration for this sync module.
* @param int $max_items_to_enqueue Maximum number of items to enqueue.
* @param boolean $state True if full sync has finished enqueueing this module, false otherwise.
* @return array Number of actions enqueued, and next module state.
*/
public function enqueue_full_sync_actions( $config, $max_items_to_enqueue, $state ) { // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable
/**
* Tells the client to sync all constants to the server
*
* @since 4.2.0
*
* @param boolean Whether to expand constants (should always be true)
*/
do_action( 'jetpack_full_sync_constants', true );
// The number of actions enqueued, and next module state (true == done).
return array( 1, true );
}
/**
* Retrieve an estimated number of actions that will be enqueued.
*
* @access public
*
* @param array $config Full sync configuration for this sync module.
* @return array Number of items yet to be enqueued.
*/
public function estimate_full_sync_actions( $config ) { // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable
return 1;
}
/**
* Retrieve the actions that will be sent for this module during a full sync.
*
* @access public
*
* @return array Full sync actions of this module.
*/
public function get_full_sync_actions() {
return array( 'jetpack_full_sync_constants' );
}
/**
* Sync the constants if we're supposed to.
*
* @access public
*/
public function maybe_sync_constants() {
if ( get_transient( self::CONSTANTS_AWAIT_TRANSIENT_NAME ) ) {
return;
}
set_transient( self::CONSTANTS_AWAIT_TRANSIENT_NAME, microtime( true ), Defaults::$default_sync_constants_wait_time );
$constants = $this->get_all_constants();
if ( empty( $constants ) ) {
return;
}
$constants_checksums = (array) get_option( self::CONSTANTS_CHECKSUM_OPTION_NAME, array() );
foreach ( $constants as $name => $value ) {
$checksum = $this->get_check_sum( $value );
// Explicitly not using Identical comparison as get_option returns a string.
if ( ! $this->still_valid_checksum( $constants_checksums, $name, $checksum ) && ! is_null( $value ) ) {
/**
* Tells the client to sync a constant to the server
*
* @since 4.2.0
*
* @param string The name of the constant
* @param mixed The value of the constant
*/
do_action( 'jetpack_sync_constant', $name, $value );
$constants_checksums[ $name ] = $checksum;
} else {
$constants_checksums[ $name ] = $checksum;
}
}
update_option( self::CONSTANTS_CHECKSUM_OPTION_NAME, $constants_checksums );
}
/**
* Retrieve all constants as per the current constants whitelist.
* Public so that we don't have to store an option for each constant.
*
* @access public
*
* @return array All constants.
*/
public function get_all_constants() {
$constants_whitelist = $this->get_constants_whitelist();
return array_combine(
$constants_whitelist,
array_map( array( $this, 'get_constant' ), $constants_whitelist )
);
}
/**
* Retrieve the value of a constant.
* Used as a wrapper to standartize access to constants.
*
* @access private
*
* @param string $constant Constant name.
* @return mixed Return value of the constant.
*/
private function get_constant( $constant ) {
return ( defined( $constant ) ) ?
constant( $constant )
: null;
}
/**
* Expand the constants within a hook before they are serialized and sent to the server.
*
* @access public
*
* @param array $args The hook parameters.
* @return array $args The hook parameters.
*/
public function expand_constants( $args ) {
if ( $args[0] ) {
$constants = $this->get_all_constants();
$constants_checksums = array();
foreach ( $constants as $name => $value ) {
$constants_checksums[ $name ] = $this->get_check_sum( $value );
}
update_option( self::CONSTANTS_CHECKSUM_OPTION_NAME, $constants_checksums );
return $constants;
}
return $args;
}
}
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