<?php
/**
 * Plugin Name: WP Cloud Maintenance Mode
 * Description: Custom implementation for use with the WP CLI maintenance-mode command.
 *
 * See: https://core.trac.wordpress.org/ticket/62489
 */
if ( ( 'fpm-fcgi' === php_sapi_name() ) && ( ! function_exists( 'wpcloud_maintenance_mode' ) ) ) {
	function wpcloud_maintenance_mode() {
		if ( ! defined( 'WP_CONTENT_DIR' ) ) {
			return;
		}

		// Return if maintenance mode is disabled.
		if ( ! file_exists( WP_CONTENT_DIR . '/.wpcloud-maintenance' ) ) {
			return;
		}

		// We do not declare the $upgrading variable in the global scope to avoid conflating our
		// plugin behavior with core's functionality.
		require WP_CONTENT_DIR . '/.wpcloud-maintenance';

		// If the $upgrading timestamp is older than 10 minutes, consider maintenance over.
		if ( ( time() - $upgrading ) >= 10 * MINUTE_IN_SECONDS ) {
			return;
		}

		if ( ! apply_filters( 'enable_maintenance_mode', true, $upgrading ) ) {
			return;
		}

		if ( file_exists( WP_CONTENT_DIR . '/maintenance.php' ) ) {
			require_once WP_CONTENT_DIR . '/maintenance.php';
			die();
		}

		require_once ABSPATH . WPINC . '/functions.php';
		wp_load_translations_early();

		header( 'Retry-After: 600' );

		wp_die(
			__( 'Briefly unavailable for scheduled maintenance. Check back in a minute.' ),
			__( 'Maintenance' ),
			503
		);
	}
	add_action( 'muplugins_loaded', 'wpcloud_maintenance_mode' );
}