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Editing: class.jetpack-sync-module-callables.php

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<?php

require_once dirname( __FILE__ ) . '/class.jetpack-sync-functions.php';

class Jetpack_Sync_Module_Callables extends Jetpack_Sync_Module {
	const CALLABLES_CHECKSUM_OPTION_NAME = 'jetpack_callables_sync_checksum';
	const CALLABLES_AWAIT_TRANSIENT_NAME = 'jetpack_sync_callables_await';

private $callable_whitelist;

public function name() {
		return 'functions';
	}

public function set_defaults() {
		if ( is_multisite() ) {
			$this->callable_whitelist = array_merge( Jetpack_Sync_Defaults::get_callable_whitelist(), Jetpack_Sync_Defaults::get_multisite_callable_whitelist() );
		} else {
			$this->callable_whitelist = Jetpack_Sync_Defaults::get_callable_whitelist();
		}
	}

public function init_listeners( $callable ) {
		add_action( 'jetpack_sync_callable', $callable, 10, 2 );

// For some options, we should always send the change right away!
		$always_send_updates_to_these_options = array(
			'jetpack_active_modules',
			'home',
			'siteurl',
			'jetpack_sync_error_idc'
		);
		foreach( $always_send_updates_to_these_options as $option ) {
			add_action( "update_option_{$option}", array( $this, 'unlock_sync_callable' ) );
		}

// Provide a hook so that hosts can send changes to certain callables right away.
		// Especially useful when a host uses constants to change home and siteurl.
		add_action( 'jetpack_sync_unlock_sync_callable', array( $this, 'unlock_sync_callable' ) );

// get_plugins and wp_version
		// gets fired when new code gets installed, updates etc.
		add_action( 'upgrader_process_complete', array( $this, 'unlock_sync_callable' ) );
	}

public function init_full_sync_listeners( $callable ) {
		add_action( 'jetpack_full_sync_callables', $callable );
	}

public function init_before_send() {
		add_action( 'jetpack_sync_before_send_queue_sync', array( $this, 'maybe_sync_callables' ) );

// full sync
		add_filter( 'jetpack_sync_before_send_jetpack_full_sync_callables', array( $this, 'expand_callables' ) );
	}

public function reset_data() {
		delete_option( self::CALLABLES_CHECKSUM_OPTION_NAME );
		delete_transient( self::CALLABLES_AWAIT_TRANSIENT_NAME );

$url_callables = array( 'home_url', 'site_url', 'main_network_site_url' );
		foreach( $url_callables as $callable ) {
			delete_option( Jetpack_Sync_Functions::HTTPS_CHECK_OPTION_PREFIX . $callable );
		}
	}

function set_callable_whitelist( $callables ) {
		$this->callable_whitelist = $callables;
	}

function get_callable_whitelist() {
		return $this->callable_whitelist;
	}

public function get_all_callables() {
		// get_all_callables should run as the master user always.
		$current_user_id = get_current_user_id();
		wp_set_current_user( Jetpack_Options::get_option( 'master_user' ) );
		$callables = array_combine(
			array_keys( $this->get_callable_whitelist() ),
			array_map( array( $this, 'get_callable' ), array_values( $this->get_callable_whitelist() ) )
		);
		wp_set_current_user( $current_user_id );

return $callables;
	}

private function get_callable( $callable ) {
		return call_user_func( $callable );
	}

public function enqueue_full_sync_actions( $config, $max_items_to_enqueue, $state ) {
		/**
		 * Tells the client to sync all callables to the server
		 *
		 * @since 4.2.0
		 *
		 * @param boolean Whether to expand callables (should always be true)
		 */
		do_action( 'jetpack_full_sync_callables', true );

// The number of actions enqueued, and next module state (true == done)
		return array( 1, true ); 
	}

public function estimate_full_sync_actions( $config ) {
		return 1;
	}

public function get_full_sync_actions() {
		return array( 'jetpack_full_sync_callables' );
	}

public function unlock_sync_callable() {
		delete_transient( self::CALLABLES_AWAIT_TRANSIENT_NAME );
	}

public function should_send_callable( $callable_checksums, $name, $checksum ) {
		$idc_override_callables = array(
			'main_network_site',
			'home_url',
			'site_url',
		);
		if ( in_array( $name, $idc_override_callables ) && Jetpack_Options::get_option( 'migrate_for_idc' ) ) {
			return true;
		}

return ! $this->still_valid_checksum( $callable_checksums, $name, $checksum );
	}
	
	public function maybe_sync_callables() {
		if ( ! is_admin() || Jetpack_Sync_Settings::is_doing_cron() ) {
			return;
		}

if ( get_transient( self::CALLABLES_AWAIT_TRANSIENT_NAME ) ) {
			return;
		}

set_transient( self::CALLABLES_AWAIT_TRANSIENT_NAME, microtime( true ), Jetpack_Sync_Defaults::$default_sync_callables_wait_time );

$callables = $this->get_all_callables();

if ( empty( $callables ) ) {
			return;
		}

$callable_checksums = (array) Jetpack_Options::get_raw_option( self::CALLABLES_CHECKSUM_OPTION_NAME, array() );

// only send the callables that have changed
		foreach ( $callables as $name => $value ) {
			$checksum = $this->get_check_sum( $value );
			// explicitly not using Identical comparison as get_option returns a string
			if ( ! is_null( $value ) && $this->should_send_callable( $callable_checksums, $name, $checksum ) ) {
				/**
				 * Tells the client to sync a callable (aka function) to the server
				 *
				 * @since 4.2.0
				 *
				 * @param string The name of the callable
				 * @param mixed The value of the callable
				 */
				do_action( 'jetpack_sync_callable', $name, $value );
				$callable_checksums[ $name ] = $checksum;
			} else {
				$callable_checksums[ $name ] = $checksum;
			}
		}
		Jetpack_Options::update_raw_option( self::CALLABLES_CHECKSUM_OPTION_NAME, $callable_checksums );
	}

public function expand_callables( $args ) {
		if ( $args[0] ) {
			$callables = $this->get_all_callables();
			$callables_checksums = array();
			foreach ( $callables as $name => $value ) {
				$callables_checksums[ $name ] = $this->get_check_sum( $value );
			}
			Jetpack_Options::update_raw_option( self::CALLABLES_CHECKSUM_OPTION_NAME, $callables_checksums );
			return $callables;
		}

return $args;
	}
}

Editing: class.jetpack-sync-module-callables.php

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