FM / includes

/var/www/p4ela.net/www/wp-admin/includes/

/var/www/p4ela.net/www/wp-admin/includes

Name	Size	Mode	Actions
admin-filters.php	8082	0666	edit dl rm
admin.php	3628	0666	edit dl rm
ajax-actions.php	151627	0666	edit dl rm
bookmark.php	11615	0666	edit dl rm
class-automatic-upgrader-skin.php	3663	0666	edit dl rm
class-bulk-plugin-upgrader-skin.php	2590	0666	edit dl rm
class-bulk-theme-upgrader-skin.php	2660	0666	edit dl rm
class-bulk-upgrader-skin.php	6753	0666	edit dl rm
class-core-upgrader.php	15191	0666	edit dl rm
class-custom-background.php	21619	0666	edit dl rm
class-custom-image-header.php	49064	0666	edit dl rm
class-file-upload-upgrader.php	4163	0666	edit dl rm
class-ftp-pure.php	5426	0666	edit dl rm
class-ftp-sockets.php	8479	0666	edit dl rm
class-ftp.php	27304	0666	edit dl rm
class-language-pack-upgrader-skin.php	2870	0666	edit dl rm
class-language-pack-upgrader.php	15561	0666	edit dl rm
class-pclzip.php	196700	0666	edit dl rm
class-plugin-installer-skin.php	12053	0666	edit dl rm
class-plugin-upgrader-skin.php	3278	0666	edit dl rm
class-plugin-upgrader.php	23243	0666	edit dl rm
class-theme-installer-skin.php	12734	0666	edit dl rm
class-theme-upgrader-skin.php	4176	0666	edit dl rm
class-theme-upgrader.php	26702	0666	edit dl rm
class-walker-category-checklist.php	5091	0666	edit dl rm
class-walker-nav-menu-checklist.php	5708	0666	edit dl rm
class-walker-nav-menu-edit.php	14265	0666	edit dl rm
class-wp-ajax-upgrader-skin.php	4193	0666	edit dl rm
class-wp-application-passwords-list-table.php	6949	0666	edit dl rm
class-wp-automatic-updater.php	61136	0666	edit dl rm
class-wp-comments-list-table.php	32918	0666	edit dl rm
class-wp-community-events.php	18769	0666	edit dl rm
class-wp-debug-data.php	65288	0666	edit dl rm
class-wp-filesystem-base.php	24410	0666	edit dl rm
class-wp-filesystem-direct.php	18143	0666	edit dl rm
class-wp-filesystem-ftpext.php	23101	0666	edit dl rm
class-wp-filesystem-ftpsockets.php	18479	0666	edit dl rm
class-wp-filesystem-ssh2.php	23310	0666	edit dl rm
class-wp-importer.php	7465	0666	edit dl rm
class-wp-internal-pointers.php	4577	0666	edit dl rm
class-wp-links-list-table.php	9241	0666	edit dl rm
class-wp-list-table-compat.php	1497	0666	edit dl rm
class-wp-list-table.php	52864	0666	edit dl rm
class-wp-media-list-table.php	25629	0666	edit dl rm
class-wp-ms-sites-list-table.php	22026	0666	edit dl rm
class-wp-ms-themes-list-table.php	28334	0666	edit dl rm
class-wp-ms-users-list-table.php	15287	0666	edit dl rm
class-wp-plugin-install-list-table.php	24786	0666	edit dl rm
class-wp-plugins-list-table.php	57786	0666	edit dl rm
class-wp-post-comments-list-table.php	1453	0666	edit dl rm
class-wp-posts-list-table.php	63946	0666	edit dl rm
class-wp-privacy-data-export-requests-list-table.php	5563	0666	edit dl rm
class-wp-privacy-data-removal-requests-list-table.php	5715	0666	edit dl rm
class-wp-privacy-policy-content.php	32777	0666	edit dl rm
class-wp-privacy-requests-table.php	13974	0666	edit dl rm
class-wp-screen.php	37327	0666	edit dl rm
class-wp-site-health-auto-updates.php	13561	0666	edit dl rm
class-wp-site-health.php	122364	0666	edit dl rm
class-wp-site-icon.php	6414	0666	edit dl rm
class-wp-terms-list-table.php	21182	0666	edit dl rm
class-wp-theme-install-list-table.php	15792	0666	edit dl rm
class-wp-themes-list-table.php	10344	0666	edit dl rm
class-wp-upgrader-skin.php	7110	0666	edit dl rm
class-wp-upgrader-skins.php	1477	0666	edit dl rm
class-wp-upgrader.php	47695	0666	edit dl rm
class-wp-users-list-table.php	19058	0666	edit dl rm
comment.php	6121	0666	edit dl rm
continents-cities.php	20540	0666	edit dl rm
credits.php	5864	0666	edit dl rm
dashboard.php	69710	0666	edit dl rm
deprecated.php	41776	0666	edit dl rm
edit-tag-messages.php	1478	0666	edit dl rm
export.php	25565	0666	edit dl rm
file.php	97575	0666	edit dl rm
image-edit.php	43850	0666	edit dl rm
image.php	43422	0666	edit dl rm
import.php	6617	0666	edit dl rm
list-table.php	3802	0666	edit dl rm
media.php	118870	0666	edit dl rm
menu.php	9618	0666	edit dl rm
meta-boxes.php	66084	0666	edit dl rm
misc.php	46465	0666	edit dl rm
ms-admin-filters.php	1296	0666	edit dl rm
ms-deprecated.php	3770	0666	edit dl rm
ms.php	33958	0666	edit dl rm
nav-menu.php	48905	0666	edit dl rm
network.php	26980	0666	edit dl rm
noop.php	1148	0666	edit dl rm
options.php	4251	0666	edit dl rm
plugin-install.php	39474	0666	edit dl rm
plugin.php	92925	0666	edit dl rm
post.php	81683	0666	edit dl rm
privacy-tools.php	33462	0666	edit dl rm
revision.php	16496	0666	edit dl rm
schema.php	42659	0666	edit dl rm
screen.php	6378	0666	edit dl rm
taxonomy.php	8424	0666	edit dl rm
template.php	98626	0666	edit dl rm
theme-install.php	6990	0666	edit dl rm
theme.php	47742	0666	edit dl rm
translation-install.php	11075	0666	edit dl rm
update-core.php	69331	0666	edit dl rm
update.php	34429	0666	edit dl rm
upgrade.php	113892	0666	edit dl rm
user.php	23740	0666	edit dl rm
widgets.php	10912	0666	edit dl rm

Edit: /var/www/p4ela.net/www/wp-admin/includes/class-theme-upgrader.php (26702B)

<?php
/**
 * Upgrade API: Theme_Upgrader class
 *
 * @package WordPress
 * @subpackage Upgrader
 * @since 4.6.0
 */

/**
 * Core class used for upgrading/installing themes.
 *
 * It is designed to upgrade/install themes from a local zip, remote zip URL,
 * or uploaded zip file.
 *
 * @since 2.8.0
 * @since 4.6.0 Moved to its own file from wp-admin/includes/class-wp-upgrader.php.
 *
 * @see WP_Upgrader
 */
class Theme_Upgrader extends WP_Upgrader {

/**
	 * Result of the theme upgrade offer.
	 *
	 * @since 2.8.0
	 * @var array|WP_Error $result
	 * @see WP_Upgrader::$result
	 */
	public $result;

/**
	 * Whether multiple themes are being upgraded/installed in bulk.
	 *
	 * @since 2.9.0
	 * @var bool $bulk
	 */
	public $bulk = false;

/**
	 * New theme info.
	 *
	 * @since 5.5.0
	 * @var array $new_theme_data
	 *
	 * @see check_package()
	 */
	public $new_theme_data = array();

/**
	 * Initializes the upgrade strings.
	 *
	 * @since 2.8.0
	 */
	public function upgrade_strings() {
		$this->strings['up_to_date'] = __( 'The theme is at the latest version.' );
		$this->strings['no_package'] = __( 'Update package not available.' );
		/* translators: %s: Package URL. */
		$this->strings['downloading_package'] = sprintf( __( 'Downloading update from %s&#8230;' ), '%s' );
		$this->strings['unpack_package'] = __( 'Unpacking the update&#8230;' );
		$this->strings['remove_old'] = __( 'Removing the old version of the theme&#8230;' );
		$this->strings['remove_old_failed'] = __( 'Could not remove the old theme.' );
		$this->strings['process_failed'] = __( 'Theme update failed.' );
		$this->strings['process_success'] = __( 'Theme updated successfully.' );
	}

/**
	 * Initializes the installation strings.
	 *
	 * @since 2.8.0
	 */
	public function install_strings() {
		$this->strings['no_package'] = __( 'Installation package not available.' );
		/* translators: %s: Package URL. */
		$this->strings['downloading_package'] = sprintf( __( 'Downloading installation package from %s&#8230;' ), '%s' );
		$this->strings['unpack_package'] = __( 'Unpacking the package&#8230;' );
		$this->strings['installing_package'] = __( 'Installing the theme&#8230;' );
		$this->strings['remove_old'] = __( 'Removing the old version of the theme&#8230;' );
		$this->strings['remove_old_failed'] = __( 'Could not remove the old theme.' );
		$this->strings['no_files'] = __( 'The theme contains no files.' );
		$this->strings['process_failed'] = __( 'Theme installation failed.' );
		$this->strings['process_success'] = __( 'Theme installed successfully.' );
		/* translators: 1: Theme name, 2: Theme version. */
		$this->strings['process_success_specific'] = __( 'Successfully installed the theme %1$s %2$s.' );
		$this->strings['parent_theme_search'] = __( 'This theme requires a parent theme. Checking if it is installed&#8230;' );
		/* translators: 1: Theme name, 2: Theme version. */
		$this->strings['parent_theme_prepare_install'] = __( 'Preparing to install %1$s %2$s&#8230;' );
		/* translators: 1: Theme name, 2: Theme version. */
		$this->strings['parent_theme_currently_installed'] = __( 'The parent theme, %1$s %2$s, is currently installed.' );
		/* translators: 1: Theme name, 2: Theme version. */
		$this->strings['parent_theme_install_success'] = __( 'Successfully installed the parent theme, %1$s %2$s.' );
		/* translators: %s: Theme name. */
		$this->strings['parent_theme_not_found'] = sprintf( __( 'The parent theme could not be found. You will need to install the parent theme, %s, before you can use this child theme.' ), '%s' );
		/* translators: %s: Theme error. */
		$this->strings['current_theme_has_errors'] = __( 'The active theme has the following error: "%s".' );

if ( ! empty( $this->skin->overwrite ) ) {
			if ( 'update-theme' === $this->skin->overwrite ) {
				$this->strings['installing_package'] = __( 'Updating the theme&#8230;' );
				$this->strings['process_failed']     = __( 'Theme update failed.' );
				$this->strings['process_success']    = __( 'Theme updated successfully.' );
			}

if ( 'downgrade-theme' === $this->skin->overwrite ) {
				$this->strings['installing_package'] = __( 'Downgrading the theme&#8230;' );
				$this->strings['process_failed']     = __( 'Theme downgrade failed.' );
				$this->strings['process_success']    = __( 'Theme downgraded successfully.' );
			}
		}
	}

/**
	 * Checks if a child theme is being installed and its parent also needs to be installed.
	 *
	 * Hooked to the {@see 'upgrader_post_install'} filter by Theme_Upgrader::install().
	 *
	 * @since 3.4.0
	 *
	 * @param bool  $install_result
	 * @param array $hook_extra
	 * @param array $child_result
	 * @return bool
	 */
	public function check_parent_theme_filter( $install_result, $hook_extra, $child_result ) {
		// Check to see if we need to install a parent theme.
		$theme_info = $this->theme_info();

if ( ! $theme_info->parent() ) {
			return $install_result;
		}

$this->skin->feedback( 'parent_theme_search' );

if ( ! $theme_info->parent()->errors() ) {
			$this->skin->feedback( 'parent_theme_currently_installed', $theme_info->parent()->display( 'Name' ), $theme_info->parent()->display( 'Version' ) );
			// We already have the theme, fall through.
			return $install_result;
		}

// We don't have the parent theme, let's install it.
		$api = themes_api(
			'theme_information',
			array(
				'slug'   => $theme_info->get( 'Template' ),
				'fields' => array(
					'sections' => false,
					'tags'     => false,
				),
			)
		); // Save on a bit of bandwidth.

if ( ! $api || is_wp_error( $api ) ) {
			$this->skin->feedback( 'parent_theme_not_found', $theme_info->get( 'Template' ) );
			// Don't show activate or preview actions after installation.
			add_filter( 'install_theme_complete_actions', array( $this, 'hide_activate_preview_actions' ) );
			return $install_result;
		}

// Backup required data we're going to override:
		$child_api             = $this->skin->api;
		$child_success_message = $this->strings['process_success'];

// Override them.
		$this->skin->api = $api;

$this->strings['process_success_specific'] = $this->strings['parent_theme_install_success'];

$this->skin->feedback( 'parent_theme_prepare_install', $api->name, $api->version );

add_filter( 'install_theme_complete_actions', '__return_false', 999 ); // Don't show any actions after installing the theme.

// Install the parent theme.
		$parent_result = $this->run(
			array(
				'package'           => $api->download_link,
				'destination'       => get_theme_root(),
				'clear_destination' => false, // Do not overwrite files.
				'clear_working'     => true,
			)
		);

if ( is_wp_error( $parent_result ) ) {
			add_filter( 'install_theme_complete_actions', array( $this, 'hide_activate_preview_actions' ) );
		}

// Start cleaning up after the parent's installation.
		remove_filter( 'install_theme_complete_actions', '__return_false', 999 );

// Reset child's result and data.
		$this->result                     = $child_result;
		$this->skin->api                  = $child_api;
		$this->strings['process_success'] = $child_success_message;

return $install_result;
	}

/**
	 * Don't display the activate and preview actions to the user.
	 *
	 * Hooked to the {@see 'install_theme_complete_actions'} filter by
	 * Theme_Upgrader::check_parent_theme_filter() when installing
	 * a child theme and installing the parent theme fails.
	 *
	 * @since 3.4.0
	 *
	 * @param array $actions Preview actions.
	 * @return array
	 */
	public function hide_activate_preview_actions( $actions ) {
		unset( $actions['activate'], $actions['preview'] );
		return $actions;
	}

/**
	 * Install a theme package.
	 *
	 * @since 2.8.0
	 * @since 3.7.0 The `$args` parameter was added, making clearing the update cache optional.
	 *
	 * @param string $package The full local path or URI of the package.
	 * @param array  $args {
	 *     Optional. Other arguments for installing a theme package. Default empty array.
	 *
	 *     @type bool $clear_update_cache Whether to clear the updates cache if successful.
	 *                                    Default true.
	 * }
	 *
	 * @return bool|WP_Error True if the installation was successful, false or a WP_Error object otherwise.
	 */
	public function install( $package, $args = array() ) {
		$defaults    = array(
			'clear_update_cache' => true,
			'overwrite_package'  => false, // Do not overwrite files.
		);
		$parsed_args = wp_parse_args( $args, $defaults );

$this->init();
		$this->install_strings();

add_filter( 'upgrader_source_selection', array( $this, 'check_package' ) );
		add_filter( 'upgrader_post_install', array( $this, 'check_parent_theme_filter' ), 10, 3 );

if ( $parsed_args['clear_update_cache'] ) {
			// Clear cache so wp_update_themes() knows about the new theme.
			add_action( 'upgrader_process_complete', 'wp_clean_themes_cache', 9, 0 );
		}

$this->run(
			array(
				'package'           => $package,
				'destination'       => get_theme_root(),
				'clear_destination' => $parsed_args['overwrite_package'],
				'clear_working'     => true,
				'hook_extra'        => array(
					'type'   => 'theme',
					'action' => 'install',
				),
			)
		);

remove_action( 'upgrader_process_complete', 'wp_clean_themes_cache', 9 );
		remove_filter( 'upgrader_source_selection', array( $this, 'check_package' ) );
		remove_filter( 'upgrader_post_install', array( $this, 'check_parent_theme_filter' ) );

if ( ! $this->result || is_wp_error( $this->result ) ) {
			return $this->result;
		}

// Refresh the Theme Update information.
		wp_clean_themes_cache( $parsed_args['clear_update_cache'] );

if ( $parsed_args['overwrite_package'] ) {
			/** This action is documented in wp-admin/includes/class-plugin-upgrader.php */
			do_action( 'upgrader_overwrote_package', $package, $this->new_theme_data, 'theme' );
		}

return true;
	}

/**
	 * Upgrades a theme.
	 *
	 * @since 2.8.0
	 * @since 3.7.0 The `$args` parameter was added, making clearing the update cache optional.
	 *
	 * @param string $theme The theme slug.
	 * @param array  $args {
	 *     Optional. Other arguments for upgrading a theme. Default empty array.
	 *
	 *     @type bool $clear_update_cache Whether to clear the update cache if successful.
	 *                                    Default true.
	 * }
	 * @return bool|WP_Error True if the upgrade was successful, false or a WP_Error object otherwise.
	 */
	public function upgrade( $theme, $args = array() ) {
		$defaults    = array(
			'clear_update_cache' => true,
		);
		$parsed_args = wp_parse_args( $args, $defaults );

$this->init();
		$this->upgrade_strings();

// Is an update available?
		$current = get_site_transient( 'update_themes' );
		if ( ! isset( $current->response[ $theme ] ) ) {
			$this->skin->before();
			$this->skin->set_result( false );
			$this->skin->error( 'up_to_date' );
			$this->skin->after();
			return false;
		}

$r = $current->response[ $theme ];

add_filter( 'upgrader_pre_install', array( $this, 'current_before' ), 10, 2 );
		add_filter( 'upgrader_post_install', array( $this, 'current_after' ), 10, 2 );
		add_filter( 'upgrader_clear_destination', array( $this, 'delete_old_theme' ), 10, 4 );
		if ( $parsed_args['clear_update_cache'] ) {
			// Clear cache so wp_update_themes() knows about the new theme.
			add_action( 'upgrader_process_complete', 'wp_clean_themes_cache', 9, 0 );
		}

$this->run(
			array(
				'package'           => $r['package'],
				'destination'       => get_theme_root( $theme ),
				'clear_destination' => true,
				'clear_working'     => true,
				'hook_extra'        => array(
					'theme'       => $theme,
					'type'        => 'theme',
					'action'      => 'update',
					'temp_backup' => array(
						'slug' => $theme,
						'src'  => get_theme_root( $theme ),
						'dir'  => 'themes',
					),
				),
			)
		);

remove_action( 'upgrader_process_complete', 'wp_clean_themes_cache', 9 );
		remove_filter( 'upgrader_pre_install', array( $this, 'current_before' ) );
		remove_filter( 'upgrader_post_install', array( $this, 'current_after' ) );
		remove_filter( 'upgrader_clear_destination', array( $this, 'delete_old_theme' ) );

if ( ! $this->result || is_wp_error( $this->result ) ) {
			return $this->result;
		}

wp_clean_themes_cache( $parsed_args['clear_update_cache'] );

/*
		 * Ensure any future auto-update failures trigger a failure email by removing
		 * the last failure notification from the list when themes update successfully.
		 */
		$past_failure_emails = get_option( 'auto_plugin_theme_update_emails', array() );

if ( isset( $past_failure_emails[ $theme ] ) ) {
			unset( $past_failure_emails[ $theme ] );
			update_option( 'auto_plugin_theme_update_emails', $past_failure_emails );
		}

return true;
	}

/**
	 * Upgrades several themes at once.
	 *
	 * @since 3.0.0
	 * @since 3.7.0 The `$args` parameter was added, making clearing the update cache optional.
	 *
	 * @param string[] $themes Array of the theme slugs.
	 * @param array    $args {
	 *     Optional. Other arguments for upgrading several themes at once. Default empty array.
	 *
	 *     @type bool $clear_update_cache Whether to clear the update cache if successful.
	 *                                    Default true.
	 * }
	 * @return array[]|false An array of results, or false if unable to connect to the filesystem.
	 */
	public function bulk_upgrade( $themes, $args = array() ) {
		$wp_version  = wp_get_wp_version();
		$defaults    = array(
			'clear_update_cache' => true,
		);
		$parsed_args = wp_parse_args( $args, $defaults );

$this->init();
		$this->bulk = true;
		$this->upgrade_strings();

$current = get_site_transient( 'update_themes' );

$this->skin->header();

// Connect to the filesystem first.
		$res = $this->fs_connect( array( WP_CONTENT_DIR ) );
		if ( ! $res ) {
			$this->skin->footer();
			return false;
		}

$this->skin->bulk_header();

/*
		 * Only start maintenance mode if:
		 * - running Multisite and there are one or more themes specified, OR
		 * - a theme with an update available is currently in use.
		 * @todo For multisite, maintenance mode should only kick in for individual sites if at all possible.
		 */
		$maintenance = ( is_multisite() && ! empty( $themes ) );
		foreach ( $themes as $theme ) {
			$maintenance = $maintenance || get_stylesheet() === $theme || get_template() === $theme;
		}
		if ( $maintenance ) {
			$this->maintenance_mode( true );
		}

$results = array();

$this->update_count   = count( $themes );
		$this->update_current = 0;
		foreach ( $themes as $theme ) {
			++$this->update_current;

$this->skin->theme_info = $this->theme_info( $theme );

if ( ! isset( $current->response[ $theme ] ) ) {
				$this->skin->set_result( true );
				$this->skin->before();
				$this->skin->feedback( 'up_to_date' );
				$this->skin->after();
				$results[ $theme ] = true;
				continue;
			}

// Get the URL to the zip file.
			$r = $current->response[ $theme ];

if ( isset( $r['requires'] ) && ! is_wp_version_compatible( $r['requires'] ) ) {
				$result = new WP_Error(
					'incompatible_wp_required_version',
					sprintf(
						/* translators: 1: Current WordPress version, 2: WordPress version required by the new theme version. */
						__( 'Your WordPress version is %1$s, however the new theme version requires %2$s.' ),
						$wp_version,
						$r['requires']
					)
				);

$this->skin->before( $result );
				$this->skin->error( $result );
				$this->skin->after();
			} elseif ( isset( $r['requires_php'] ) && ! is_php_version_compatible( $r['requires_php'] ) ) {
				$result = new WP_Error(
					'incompatible_php_required_version',
					sprintf(
						/* translators: 1: Current PHP version, 2: PHP version required by the new theme version. */
						__( 'The PHP version on your server is %1$s, however the new theme version requires %2$s.' ),
						PHP_VERSION,
						$r['requires_php']
					)
				);

$this->skin->before( $result );
				$this->skin->error( $result );
				$this->skin->after();
			} else {
				add_filter( 'upgrader_source_selection', array( $this, 'check_package' ) );
				$result = $this->run(
					array(
						'package'           => $r['package'],
						'destination'       => get_theme_root( $theme ),
						'clear_destination' => true,
						'clear_working'     => true,
						'is_multi'          => true,
						'hook_extra'        => array(
							'theme'       => $theme,
							'temp_backup' => array(
								'slug' => $theme,
								'src'  => get_theme_root( $theme ),
								'dir'  => 'themes',
							),
						),
					)
				);
				remove_filter( 'upgrader_source_selection', array( $this, 'check_package' ) );
			}

$results[ $theme ] = $result;

// Prevent credentials auth screen from displaying multiple times.
			if ( false === $result ) {
				break;
			}
		} // End foreach $themes.

$this->maintenance_mode( false );

// Refresh the Theme Update information.
		wp_clean_themes_cache( $parsed_args['clear_update_cache'] );

/** This action is documented in wp-admin/includes/class-wp-upgrader.php */
		do_action(
			'upgrader_process_complete',
			$this,
			array(
				'action' => 'update',
				'type'   => 'theme',
				'bulk'   => true,
				'themes' => $themes,
			)
		);

$this->skin->bulk_footer();

$this->skin->footer();

// Cleanup our hooks, in case something else does an upgrade on this connection.
		remove_filter( 'upgrader_pre_install', array( $this, 'current_before' ) );
		remove_filter( 'upgrader_post_install', array( $this, 'current_after' ) );
		remove_filter( 'upgrader_clear_destination', array( $this, 'delete_old_theme' ) );

foreach ( $results as $theme => $result ) {
			// Maintain last failure notification when themes failed to update manually.
			if ( ! $result || is_wp_error( $result ) || ! isset( $past_failure_emails[ $theme ] ) ) {
				continue;
			}

unset( $past_failure_emails[ $theme ] );
		}

update_option( 'auto_plugin_theme_update_emails', $past_failure_emails );

return $results;
	}

/**
	 * Checks that the package source contains a valid theme.
	 *
	 * Hooked to the {@see 'upgrader_source_selection'} filter by Theme_Upgrader::install().
	 *
	 * @since 3.3.0
	 *
	 * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass.
	 *
	 * @param string $source The path to the downloaded package source.
	 * @return string|WP_Error The source as passed, or a WP_Error object on failure.
	 */
	public function check_package( $source ) {
		global $wp_filesystem;

$wp_version           = wp_get_wp_version();
		$this->new_theme_data = array();

if ( is_wp_error( $source ) ) {
			return $source;
		}

// Check that the folder contains a valid theme.
		$working_directory = str_replace( $wp_filesystem->wp_content_dir(), trailingslashit( WP_CONTENT_DIR ), $source );
		if ( ! is_dir( $working_directory ) ) { // Confidence check, if the above fails, let's not prevent installation.
			return $source;
		}

// A proper archive should have a style.css file in the single subdirectory.
		if ( ! file_exists( $working_directory . 'style.css' ) ) {
			return new WP_Error(
				'incompatible_archive_theme_no_style',
				$this->strings['incompatible_archive'],
				sprintf(
					/* translators: %s: style.css */
					__( 'The theme is missing the %s stylesheet.' ),
					'<code>style.css</code>'
				)
			);
		}

// All these headers are needed on Theme_Installer_Skin::do_overwrite().
		$info = get_file_data(
			$working_directory . 'style.css',
			array(
				'Name'        => 'Theme Name',
				'Version'     => 'Version',
				'Author'      => 'Author',
				'Template'    => 'Template',
				'RequiresWP'  => 'Requires at least',
				'RequiresPHP' => 'Requires PHP',
			)
		);

if ( empty( $info['Name'] ) ) {
			return new WP_Error(
				'incompatible_archive_theme_no_name',
				$this->strings['incompatible_archive'],
				sprintf(
					/* translators: %s: style.css */
					__( 'The %s stylesheet does not contain a valid theme header.' ),
					'<code>style.css</code>'
				)
			);
		}

/*
		 * Parent themes must contain an index file:
		 * - classic themes require /index.php
		 * - block themes require /templates/index.html or block-templates/index.html (deprecated 5.9.0).
		 */
		if (
			empty( $info['Template'] ) &&
			! file_exists( $working_directory . 'index.php' ) &&
			! file_exists( $working_directory . 'templates/index.html' ) &&
			! file_exists( $working_directory . 'block-templates/index.html' )
		) {
			return new WP_Error(
				'incompatible_archive_theme_no_index',
				$this->strings['incompatible_archive'],
				sprintf(
					/* translators: 1: templates/index.html, 2: index.php, 3: Documentation URL, 4: Template, 5: style.css */
					__( 'Template is missing. Standalone themes need to have a %1$s or %2$s template file. <a href="%3$s">Child themes</a> need to have a %4$s header in the %5$s stylesheet.' ),
					'<code>templates/index.html</code>',
					'<code>index.php</code>',
					__( 'https://developer.wordpress.org/themes/advanced-topics/child-themes/' ),
					'<code>Template</code>',
					'<code>style.css</code>'
				)
			);
		}

$requires_php = isset( $info['RequiresPHP'] ) ? $info['RequiresPHP'] : null;
		$requires_wp  = isset( $info['RequiresWP'] ) ? $info['RequiresWP'] : null;

if ( ! is_php_version_compatible( $requires_php ) ) {
			$error = sprintf(
				/* translators: 1: Current PHP version, 2: Version required by the uploaded theme. */
				__( 'The PHP version on your server is %1$s, however the uploaded theme requires %2$s.' ),
				PHP_VERSION,
				$requires_php
			);

return new WP_Error( 'incompatible_php_required_version', $this->strings['incompatible_archive'], $error );
		}
		if ( ! is_wp_version_compatible( $requires_wp ) ) {
			$error = sprintf(
				/* translators: 1: Current WordPress version, 2: Version required by the uploaded theme. */
				__( 'Your WordPress version is %1$s, however the uploaded theme requires %2$s.' ),
				$wp_version,
				$requires_wp
			);

return new WP_Error( 'incompatible_wp_required_version', $this->strings['incompatible_archive'], $error );
		}

$this->new_theme_data = $info;

return $source;
	}

/**
	 * Turns on maintenance mode before attempting to upgrade the active theme.
	 *
	 * Hooked to the {@see 'upgrader_pre_install'} filter by Theme_Upgrader::upgrade() and
	 * Theme_Upgrader::bulk_upgrade().
	 *
	 * @since 2.8.0
	 *
	 * @param bool|WP_Error $response The installation response before the installation has started.
	 * @param array         $theme    Theme arguments.
	 * @return bool|WP_Error The original `$response` parameter or WP_Error.
	 */
	public function current_before( $response, $theme ) {
		if ( is_wp_error( $response ) ) {
			return $response;
		}

$theme = isset( $theme['theme'] ) ? $theme['theme'] : '';

// Only run if active theme.
		if ( get_stylesheet() !== $theme ) {
			return $response;
		}

// Change to maintenance mode. Bulk edit handles this separately.
		if ( ! $this->bulk ) {
			$this->maintenance_mode( true );
		}

return $response;
	}

/**
	 * Turns off maintenance mode after upgrading the active theme.
	 *
	 * Hooked to the {@see 'upgrader_post_install'} filter by Theme_Upgrader::upgrade()
	 * and Theme_Upgrader::bulk_upgrade().
	 *
	 * @since 2.8.0
	 *
	 * @param bool|WP_Error $response The installation response after the installation has finished.
	 * @param array         $theme    Theme arguments.
	 * @return bool|WP_Error The original `$response` parameter or WP_Error.
	 */
	public function current_after( $response, $theme ) {
		if ( is_wp_error( $response ) ) {
			return $response;
		}

$theme = isset( $theme['theme'] ) ? $theme['theme'] : '';

// Only run if active theme.
		if ( get_stylesheet() !== $theme ) {
			return $response;
		}

// Ensure stylesheet name hasn't changed after the upgrade:
		if ( get_stylesheet() === $theme && $theme !== $this->result['destination_name'] ) {
			wp_clean_themes_cache();
			$stylesheet = $this->result['destination_name'];
			switch_theme( $stylesheet );
		}

// Time to remove maintenance mode. Bulk edit handles this separately.
		if ( ! $this->bulk ) {
			$this->maintenance_mode( false );
		}
		return $response;
	}

/**
	 * Deletes the old theme during an upgrade.
	 *
	 * Hooked to the {@see 'upgrader_clear_destination'} filter by Theme_Upgrader::upgrade()
	 * and Theme_Upgrader::bulk_upgrade().
	 *
	 * @since 2.8.0
	 *
	 * @global WP_Filesystem_Base $wp_filesystem Subclass
	 *
	 * @param bool   $removed
	 * @param string $local_destination
	 * @param string $remote_destination
	 * @param array  $theme
	 * @return bool
	 */
	public function delete_old_theme( $removed, $local_destination, $remote_destination, $theme ) {
		global $wp_filesystem;

if ( is_wp_error( $removed ) ) {
			return $removed; // Pass errors through.
		}

if ( ! isset( $theme['theme'] ) ) {
			return $removed;
		}

$theme      = $theme['theme'];
		$themes_dir = trailingslashit( $wp_filesystem->wp_themes_dir( $theme ) );
		if ( $wp_filesystem->exists( $themes_dir . $theme ) ) {
			if ( ! $wp_filesystem->delete( $themes_dir . $theme, true ) ) {
				return false;
			}
		}

return true;
	}

/**
	 * Gets the WP_Theme object for a theme.
	 *
	 * @since 2.8.0
	 * @since 3.0.0 The `$theme` argument was added.
	 *
	 * @param string $theme The directory name of the theme. This is optional, and if not supplied,
	 *                      the directory name from the last result will be used.
	 * @return WP_Theme|false The theme's info object, or false `$theme` is not supplied
	 *                        and the last result isn't set.
	 */
	public function theme_info( $theme = null ) {
		if ( empty( $theme ) ) {
			if ( ! empty( $this->result['destination_name'] ) ) {
				$theme = $this->result['destination_name'];
			} else {
				return false;
			}
		}

$theme = wp_get_theme( $theme );
		$theme->cache_delete();

return $theme;
	}
}

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