<?php

/**

 * Multisite upgrade administration panel.

 *

 * @package WordPress

 * @subpackage Multisite

 * @since 3.0.0

 */

/** Load WordPress Administration Bootstrap */

require_once __DIR__ . '/admin.php';

require_once ABSPATH . WPINC . '/http.php';

// Used in the HTML title tag.

$title       = __( 'Upgrade Network' );

$parent_file = 'upgrade.php';

get_current_screen()->add_help_tab(

	array(

		'id'      => 'overview',

		'title'   => __( 'Overview' ),

		'content' =>

			'<p>' . __( 'Only use this screen once you have updated to a new version of WordPress through Updates/Available Updates (via the Network Administration navigation menu or the Toolbar). Clicking the Upgrade Network button will step through each site in the network, five at a time, and make sure any database updates are applied.' ) . '</p>' .

			'<p>' . __( 'If a version update to core has not happened, clicking this button will not affect anything.' ) . '</p>' .

			'<p>' . __( 'If this process fails for any reason, users logging in to their sites will force the same update.' ) . '</p>',

	)

);

get_current_screen()->set_help_sidebar(

	'<p><strong>' . __( 'For more information:' ) . '</strong></p>' .

	'<p>' . __( '<a href="https://developer.wordpress.org/advanced-administration/multisite/admin/#network-admin-updates-screen">Documentation on Upgrade Network</a>' ) . '</p>' .

	'<p>' . __( '<a href="https://wordpress.org/support/forums/">Support forums</a>' ) . '</p>'

);

require_once ABSPATH . 'wp-admin/admin-header.php';

if ( ! current_user_can( 'upgrade_network' ) ) {

	wp_die( __( 'Sorry, you are not allowed to access this page.' ), 403 );

}

echo '<div class="wrap">';

echo '<h1>' . __( 'Upgrade Network' ) . '</h1>';

$action = isset( $_GET['action'] ) ? $_GET['action'] : 'show';

switch ( $action ) {

	case 'upgrade':

		$n = ( isset( $_GET['n'] ) ) ? (int) $_GET['n'] : 0;

		if ( $n < 5 ) {

			/**

			 * @global int $wp_db_version WordPress database version.

			 */

			global $wp_db_version;

			update_site_option( 'wpmu_upgrade_site', $wp_db_version );

		}

		$site_ids = get_sites(

			array(

				'spam'                   => 0,

				'deleted'                => 0,

				'archived'               => 0,

				'network_id'             => get_current_network_id(),

				'number'                 => 5,

				'offset'                 => $n,

				'fields'                 => 'ids',

				'order'                  => 'DESC',

				'orderby'                => 'id',

				'update_site_meta_cache' => false,

			)

		);

		if ( empty( $site_ids ) ) {

			echo '<p>' . __( 'All done!' ) . '</p>';

			break;

		}

		echo '<ul>';

		foreach ( (array) $site_ids as $site_id ) {

			switch_to_blog( $site_id );

			$siteurl     = site_url();

			$upgrade_url = admin_url( 'upgrade.php?step=upgrade_db' );

			restore_current_blog();

			echo "<li>$siteurl</li>";

			$response = wp_remote_get(

				$upgrade_url,

				array(

					'timeout'     => 120,

					'httpversion' => '1.1',

					'sslverify'   => false,

				)

			);

			if ( is_wp_error( $response ) ) {

				wp_die(

					sprintf(

						/* translators: 1: Site URL, 2: Server error message. */

						__( 'Warning! Problem updating %1$s. Your server may not be able to connect to sites running on it. Error message: %2$s' ),

						$siteurl,

						'<em>' . $response->get_error_message() . '</em>'

					)

				);

			}

			/**

			 * Fires after the Multisite DB upgrade for each site is complete.

			 *

			 * @since MU (3.0.0)

			 *

			 * @param array $response The upgrade response array.

			 */

			do_action( 'after_mu_upgrade', $response );

			/**

			 * Fires after each site has been upgraded.

			 *

			 * @since MU (3.0.0)

			 *

			 * @param int $site_id The Site ID.

			 */

			do_action( 'wpmu_upgrade_site', $site_id );

		}

		echo '</ul>';

		?><p><?php _e( 'If your browser does not start loading the next page automatically, click this link:' ); ?> <a class="button" href="upgrade.php?action=upgrade&amp;n=<?php echo ( $n + 5 ); ?>"><?php _e( 'Next Sites' ); ?></a></p>

		<script type="text/javascript">

		<!--

		function nextpage() {

			location.href = "upgrade.php?action=upgrade&n=<?php echo ( $n + 5 ); ?>";

		}

		setTimeout( "nextpage()", 250 );

		//-->

		</script>

		<?php

		break;

	case 'show':

	default:

		if ( (int) get_site_option( 'wpmu_upgrade_site' ) !== $GLOBALS['wp_db_version'] ) :

			?>

		<h2><?php _e( 'Database Update Required' ); ?></h2>

		<p><?php _e( 'WordPress has been updated! Next and final step is to individually upgrade the sites in your network.' ); ?></p>

		<?php endif; ?>

		<p><?php _e( 'The database update process may take a little while, so please be patient.' ); ?></p>

		<p><a class="button button-primary" href="upgrade.php?action=upgrade"><?php _e( 'Upgrade Network' ); ?></a></p>

		<?php

		/**

		 * Fires before the footer on the network upgrade screen.

		 *

		 * @since MU (3.0.0)

		 */

		do_action( 'wpmu_upgrade_page' );

		break;

}

?>

</div>

<?php require_once ABSPATH . 'wp-admin/admin-footer.php'; ?>