Adding upstream version 6.4.3+dfsg1.upstream/6.4.3+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1174 insertions, 0 deletions

diff --git a/wp-includes/update.php b/wp-includes/update.php
new file mode 100644
index 0000000..e2ac6b8
--- /dev/null
+++ b/wp-includes/update.php
@@ -0,0 +1,1174 @@
+<?php
+/**
+ * A simple set of functions to check the WordPress.org Version Update service.
+ *
+ * @package WordPress
+ * @since 2.3.0
+ */
+
+/**
+ * Checks WordPress version against the newest version.
+ *
+ * The WordPress version, PHP version, and locale is sent.
+ *
+ * Checks against the WordPress server at api.wordpress.org. Will only check
+ * if WordPress isn't installing.
+ *
+ * @since 2.3.0
+ *
+ * @global string $wp_version       Used to check against the newest WordPress version.
+ * @global wpdb   $wpdb             WordPress database abstraction object.
+ * @global string $wp_local_package Locale code of the package.
+ *
+ * @param array $extra_stats Extra statistics to report to the WordPress.org API.
+ * @param bool  $force_check Whether to bypass the transient cache and force a fresh update check.
+ *                           Defaults to false, true if $extra_stats is set.
+ */
+function wp_version_check( $extra_stats = array(), $force_check = false ) {
+	global $wpdb, $wp_local_package;
+
+	if ( wp_installing() ) {
+		return;
+	}
+
+	// Include an unmodified $wp_version.
+	require ABSPATH . WPINC . '/version.php';
+	$php_version = PHP_VERSION;
+
+	$current      = get_site_transient( 'update_core' );
+	$translations = wp_get_installed_translations( 'core' );
+
+	// Invalidate the transient when $wp_version changes.
+	if ( is_object( $current ) && $wp_version !== $current->version_checked ) {
+		$current = false;
+	}
+
+	if ( ! is_object( $current ) ) {
+		$current                  = new stdClass();
+		$current->updates         = array();
+		$current->version_checked = $wp_version;
+	}
+
+	if ( ! empty( $extra_stats ) ) {
+		$force_check = true;
+	}
+
+	// Wait 1 minute between multiple version check requests.
+	$timeout          = MINUTE_IN_SECONDS;
+	$time_not_changed = isset( $current->last_checked ) && $timeout > ( time() - $current->last_checked );
+
+	if ( ! $force_check && $time_not_changed ) {
+		return;
+	}
+
+	/**
+	 * Filters the locale requested for WordPress core translations.
+	 *
+	 * @since 2.8.0
+	 *
+	 * @param string $locale Current locale.
+	 */
+	$locale = apply_filters( 'core_version_check_locale', get_locale() );
+
+	// Update last_checked for current to prevent multiple blocking requests if request hangs.
+	$current->last_checked = time();
+	set_site_transient( 'update_core', $current );
+
+	if ( method_exists( $wpdb, 'db_server_info' ) ) {
+		$mysql_version = $wpdb->db_server_info();
+	} elseif ( method_exists( $wpdb, 'db_version' ) ) {
+		$mysql_version = preg_replace( '/[^0-9.].*/', '', $wpdb->db_version() );
+	} else {
+		$mysql_version = 'N/A';
+	}
+
+	if ( is_multisite() ) {
+		$num_blogs         = get_blog_count();
+		$wp_install        = network_site_url();
+		$multisite_enabled = 1;
+	} else {
+		$multisite_enabled = 0;
+		$num_blogs         = 1;
+		$wp_install        = home_url( '/' );
+	}
+
+	$extensions = get_loaded_extensions();
+	sort( $extensions, SORT_STRING | SORT_FLAG_CASE );
+	$query = array(
+		'version'            => $wp_version,
+		'php'                => $php_version,
+		'locale'             => $locale,
+		'mysql'              => $mysql_version,
+		'local_package'      => isset( $wp_local_package ) ? $wp_local_package : '',
+		'blogs'              => $num_blogs,
+		'users'              => get_user_count(),
+		'multisite_enabled'  => $multisite_enabled,
+		'initial_db_version' => get_site_option( 'initial_db_version' ),
+		'extensions'         => array_combine( $extensions, array_map( 'phpversion', $extensions ) ),
+		'platform_flags'     => array(
+			'os'   => PHP_OS,
+			'bits' => PHP_INT_SIZE === 4 ? 32 : 64,
+		),
+		'image_support'      => array(),
+	);
+
+	if ( function_exists( 'gd_info' ) ) {
+		$gd_info = gd_info();
+		// Filter to supported values.
+		$gd_info = array_filter( $gd_info );
+
+		// Add data for GD WebP and AVIF support.
+		$query['image_support']['gd'] = array_keys(
+			array_filter(
+				array(
+					'webp' => isset( $gd_info['WebP Support'] ),
+					'avif' => isset( $gd_info['AVIF Support'] ),
+				)
+			)
+		);
+	}
+
+	if ( class_exists( 'Imagick' ) ) {
+		// Add data for Imagick WebP and AVIF support.
+		$query['image_support']['imagick'] = array_keys(
+			array_filter(
+				array(
+					'webp' => ! empty( Imagick::queryFormats( 'WEBP' ) ),
+					'avif' => ! empty( Imagick::queryFormats( 'AVIF' ) ),
+				)
+			)
+		);
+	}
+
+	/**
+	 * Filters the query arguments sent as part of the core version check.
+	 *
+	 * WARNING: Changing this data may result in your site not receiving security updates.
+	 * Please exercise extreme caution.
+	 *
+	 * @since 4.9.0
+	 *
+	 * @param array $query {
+	 *     Version check query arguments.
+	 *
+	 *     @type string $version            WordPress version number.
+	 *     @type string $php                PHP version number.
+	 *     @type string $locale             The locale to retrieve updates for.
+	 *     @type string $mysql              MySQL version number.
+	 *     @type string $local_package      The value of the $wp_local_package global, when set.
+	 *     @type int    $blogs              Number of sites on this WordPress installation.
+	 *     @type int    $users              Number of users on this WordPress installation.
+	 *     @type int    $multisite_enabled  Whether this WordPress installation uses Multisite.
+	 *     @type int    $initial_db_version Database version of WordPress at time of installation.
+	 * }
+	 */
+	$query = apply_filters( 'core_version_check_query_args', $query );
+
+	$post_body = array(
+		'translations' => wp_json_encode( $translations ),
+	);
+
+	if ( is_array( $extra_stats ) ) {
+		$post_body = array_merge( $post_body, $extra_stats );
+	}
+
+	// Allow for WP_AUTO_UPDATE_CORE to specify beta/RC/development releases.
+	if ( defined( 'WP_AUTO_UPDATE_CORE' )
+		&& in_array( WP_AUTO_UPDATE_CORE, array( 'beta', 'rc', 'development', 'branch-development' ), true )
+	) {
+		$query['channel'] = WP_AUTO_UPDATE_CORE;
+	}
+
+	$url      = 'http://api.wordpress.org/core/version-check/1.7/?' . http_build_query( $query, '', '&' );
+	$http_url = $url;
+	$ssl      = wp_http_supports( array( 'ssl' ) );
+
+	if ( $ssl ) {
+		$url = set_url_scheme( $url, 'https' );
+	}
+
+	$doing_cron = wp_doing_cron();
+
+	$options = array(
+		'timeout'    => $doing_cron ? 30 : 3,
+		'user-agent' => 'WordPress/' . $wp_version . '; ' . home_url( '/' ),
+		'headers'    => array(
+			'wp_install' => $wp_install,
+			'wp_blog'    => home_url( '/' ),
+		),
+		'body'       => $post_body,
+	);
+
+	$response = wp_remote_post( $url, $options );
+
+	if ( $ssl && is_wp_error( $response ) ) {
+		trigger_error(
+			sprintf(
+				/* translators: %s: Support forums URL. */
+				__( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server&#8217;s configuration. If you continue to have problems, please try the <a href="%s">support forums</a>.' ),
+				__( 'https://wordpress.org/support/forums/' )
+			) . ' ' . __( '(WordPress could not establish a secure connection to WordPress.org. Please contact your server administrator.)' ),
+			headers_sent() || WP_DEBUG ? E_USER_WARNING : E_USER_NOTICE
+		);
+		$response = wp_remote_post( $http_url, $options );
+	}
+
+	if ( is_wp_error( $response ) || 200 !== wp_remote_retrieve_response_code( $response ) ) {
+		return;
+	}
+
+	$body = trim( wp_remote_retrieve_body( $response ) );
+	$body = json_decode( $body, true );
+
+	if ( ! is_array( $body ) || ! isset( $body['offers'] ) ) {
+		return;
+	}
+
+	$offers = $body['offers'];
+
+	foreach ( $offers as &$offer ) {
+		foreach ( $offer as $offer_key => $value ) {
+			if ( 'packages' === $offer_key ) {
+				$offer['packages'] = (object) array_intersect_key(
+					array_map( 'esc_url', $offer['packages'] ),
+					array_fill_keys( array( 'full', 'no_content', 'new_bundled', 'partial', 'rollback' ), '' )
+				);
+			} elseif ( 'download' === $offer_key ) {
+				$offer['download'] = esc_url( $value );
+			} else {
+				$offer[ $offer_key ] = esc_html( $value );
+			}
+		}
+		$offer = (object) array_intersect_key(
+			$offer,
+			array_fill_keys(
+				array(
+					'response',
+					'download',
+					'locale',
+					'packages',
+					'current',
+					'version',
+					'php_version',
+					'mysql_version',
+					'new_bundled',
+					'partial_version',
+					'notify_email',
+					'support_email',
+					'new_files',
+				),
+				''
+			)
+		);
+	}
+
+	$updates                  = new stdClass();
+	$updates->updates         = $offers;
+	$updates->last_checked    = time();
+	$updates->version_checked = $wp_version;
+
+	if ( isset( $body['translations'] ) ) {
+		$updates->translations = $body['translations'];
+	}
+
+	set_site_transient( 'update_core', $updates );
+
+	if ( ! empty( $body['ttl'] ) ) {
+		$ttl = (int) $body['ttl'];
+
+		if ( $ttl && ( time() + $ttl < wp_next_scheduled( 'wp_version_check' ) ) ) {
+			// Queue an event to re-run the update check in $ttl seconds.
+			wp_schedule_single_event( time() + $ttl, 'wp_version_check' );
+		}
+	}
+
+	// Trigger background updates if running non-interactively, and we weren't called from the update handler.
+	if ( $doing_cron && ! doing_action( 'wp_maybe_auto_update' ) ) {
+		/**
+		 * Fires during wp_cron, starting the auto-update process.
+		 *
+		 * @since 3.9.0
+		 */
+		do_action( 'wp_maybe_auto_update' );
+	}
+}
+
+/**
+ * Checks for available updates to plugins based on the latest versions hosted on WordPress.org.
+ *
+ * Despite its name this function does not actually perform any updates, it only checks for available updates.
+ *
+ * A list of all plugins installed is sent to WP, along with the site locale.
+ *
+ * Checks against the WordPress server at api.wordpress.org. Will only check
+ * if WordPress isn't installing.
+ *
+ * @since 2.3.0
+ *
+ * @global string $wp_version The WordPress version string.
+ *
+ * @param array $extra_stats Extra statistics to report to the WordPress.org API.
+ */
+function wp_update_plugins( $extra_stats = array() ) {
+	if ( wp_installing() ) {
+		return;
+	}
+
+	// Include an unmodified $wp_version.
+	require ABSPATH . WPINC . '/version.php';
+
+	// If running blog-side, bail unless we've not checked in the last 12 hours.
+	if ( ! function_exists( 'get_plugins' ) ) {
+		require_once ABSPATH . 'wp-admin/includes/plugin.php';
+	}
+
+	$plugins      = get_plugins();
+	$translations = wp_get_installed_translations( 'plugins' );
+
+	$active  = get_option( 'active_plugins', array() );
+	$current = get_site_transient( 'update_plugins' );
+
+	if ( ! is_object( $current ) ) {
+		$current = new stdClass();
+	}
+
+	$updates               = new stdClass();
+	$updates->last_checked = time();
+	$updates->response     = array();
+	$updates->translations = array();
+	$updates->no_update    = array();
+
+	$doing_cron = wp_doing_cron();
+
+	// Check for update on a different schedule, depending on the page.
+	switch ( current_filter() ) {
+		case 'upgrader_process_complete':
+			$timeout = 0;
+			break;
+		case 'load-update-core.php':
+			$timeout = MINUTE_IN_SECONDS;
+			break;
+		case 'load-plugins.php':
+		case 'load-update.php':
+			$timeout = HOUR_IN_SECONDS;
+			break;
+		default:
+			if ( $doing_cron ) {
+				$timeout = 2 * HOUR_IN_SECONDS;
+			} else {
+				$timeout = 12 * HOUR_IN_SECONDS;
+			}
+	}
+
+	$time_not_changed = isset( $current->last_checked ) && $timeout > ( time() - $current->last_checked );
+
+	if ( $time_not_changed && ! $extra_stats ) {
+		$plugin_changed = false;
+
+		foreach ( $plugins as $file => $p ) {
+			$updates->checked[ $file ] = $p['Version'];
+
+			if ( ! isset( $current->checked[ $file ] ) || (string) $current->checked[ $file ] !== (string) $p['Version'] ) {
+				$plugin_changed = true;
+			}
+		}
+
+		if ( isset( $current->response ) && is_array( $current->response ) ) {
+			foreach ( $current->response as $plugin_file => $update_details ) {
+				if ( ! isset( $plugins[ $plugin_file ] ) ) {
+					$plugin_changed = true;
+					break;
+				}
+			}
+		}
+
+		// Bail if we've checked recently and if nothing has changed.
+		if ( ! $plugin_changed ) {
+			return;
+		}
+	}
+
+	// Update last_checked for current to prevent multiple blocking requests if request hangs.
+	$current->last_checked = time();
+	set_site_transient( 'update_plugins', $current );
+
+	$to_send = compact( 'plugins', 'active' );
+
+	$locales = array_values( get_available_languages() );
+
+	/**
+	 * Filters the locales requested for plugin translations.
+	 *
+	 * @since 3.7.0
+	 * @since 4.5.0 The default value of the `$locales` parameter changed to include all locales.
+	 *
+	 * @param string[] $locales Plugin locales. Default is all available locales of the site.
+	 */
+	$locales = apply_filters( 'plugins_update_check_locales', $locales );
+	$locales = array_unique( $locales );
+
+	if ( $doing_cron ) {
+		$timeout = 30; // 30 seconds.
+	} else {
+		// Three seconds, plus one extra second for every 10 plugins.
+		$timeout = 3 + (int) ( count( $plugins ) / 10 );
+	}
+
+	$options = array(
+		'timeout'    => $timeout,
+		'body'       => array(
+			'plugins'      => wp_json_encode( $to_send ),
+			'translations' => wp_json_encode( $translations ),
+			'locale'       => wp_json_encode( $locales ),
+			'all'          => wp_json_encode( true ),
+		),
+		'user-agent' => 'WordPress/' . $wp_version . '; ' . home_url( '/' ),
+	);
+
+	if ( $extra_stats ) {
+		$options['body']['update_stats'] = wp_json_encode( $extra_stats );
+	}
+
+	$url      = 'http://api.wordpress.org/plugins/update-check/1.1/';
+	$http_url = $url;
+	$ssl      = wp_http_supports( array( 'ssl' ) );
+
+	if ( $ssl ) {
+		$url = set_url_scheme( $url, 'https' );
+	}
+
+	$raw_response = wp_remote_post( $url, $options );
+
+	if ( $ssl && is_wp_error( $raw_response ) ) {
+		trigger_error(
+			sprintf(
+				/* translators: %s: Support forums URL. */
+				__( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server&#8217;s configuration. If you continue to have problems, please try the <a href="%s">support forums</a>.' ),
+				__( 'https://wordpress.org/support/forums/' )
+			) . ' ' . __( '(WordPress could not establish a secure connection to WordPress.org. Please contact your server administrator.)' ),
+			headers_sent() || WP_DEBUG ? E_USER_WARNING : E_USER_NOTICE
+		);
+		$raw_response = wp_remote_post( $http_url, $options );
+	}
+
+	if ( is_wp_error( $raw_response ) || 200 !== wp_remote_retrieve_response_code( $raw_response ) ) {
+		return;
+	}
+
+	$response = json_decode( wp_remote_retrieve_body( $raw_response ), true );
+
+	if ( $response && is_array( $response ) ) {
+		$updates->response     = $response['plugins'];
+		$updates->translations = $response['translations'];
+		$updates->no_update    = $response['no_update'];
+	}
+
+	// Support updates for any plugins using the `Update URI` header field.
+	foreach ( $plugins as $plugin_file => $plugin_data ) {
+		if ( ! $plugin_data['UpdateURI'] || isset( $updates->response[ $plugin_file ] ) ) {
+			continue;
+		}
+
+		$hostname = wp_parse_url( sanitize_url( $plugin_data['UpdateURI'] ), PHP_URL_HOST );
+
+		/**
+		 * Filters the update response for a given plugin hostname.
+		 *
+		 * The dynamic portion of the hook name, `$hostname`, refers to the hostname
+		 * of the URI specified in the `Update URI` header field.
+		 *
+		 * @since 5.8.0
+		 *
+		 * @param array|false $update {
+		 *     The plugin update data with the latest details. Default false.
+		 *
+		 *     @type string $id           Optional. ID of the plugin for update purposes, should be a URI
+		 *                                specified in the `Update URI` header field.
+		 *     @type string $slug         Slug of the plugin.
+		 *     @type string $version      The version of the plugin.
+		 *     @type string $url          The URL for details of the plugin.
+		 *     @type string $package      Optional. The update ZIP for the plugin.
+		 *     @type string $tested       Optional. The version of WordPress the plugin is tested against.
+		 *     @type string $requires_php Optional. The version of PHP which the plugin requires.
+		 *     @type bool   $autoupdate   Optional. Whether the plugin should automatically update.
+		 *     @type array  $icons        Optional. Array of plugin icons.
+		 *     @type array  $banners      Optional. Array of plugin banners.
+		 *     @type array  $banners_rtl  Optional. Array of plugin RTL banners.
+		 *     @type array  $translations {
+		 *         Optional. List of translation updates for the plugin.
+		 *
+		 *         @type string $language   The language the translation update is for.
+		 *         @type string $version    The version of the plugin this translation is for.
+		 *                                  This is not the version of the language file.
+		 *         @type string $updated    The update timestamp of the translation file.
+		 *                                  Should be a date in the `YYYY-MM-DD HH:MM:SS` format.
+		 *         @type string $package    The ZIP location containing the translation update.
+		 *         @type string $autoupdate Whether the translation should be automatically installed.
+		 *     }
+		 * }
+		 * @param array       $plugin_data      Plugin headers.
+		 * @param string      $plugin_file      Plugin filename.
+		 * @param string[]    $locales          Installed locales to look up translations for.
+		 */
+		$update = apply_filters( "update_plugins_{$hostname}", false, $plugin_data, $plugin_file, $locales );
+
+		if ( ! $update ) {
+			continue;
+		}
+
+		$update = (object) $update;
+
+		// Is it valid? We require at least a version.
+		if ( ! isset( $update->version ) ) {
+			continue;
+		}
+
+		// These should remain constant.
+		$update->id     = $plugin_data['UpdateURI'];
+		$update->plugin = $plugin_file;
+
+		// WordPress needs the version field specified as 'new_version'.
+		if ( ! isset( $update->new_version ) ) {
+			$update->new_version = $update->version;
+		}
+
+		// Handle any translation updates.
+		if ( ! empty( $update->translations ) ) {
+			foreach ( $update->translations as $translation ) {
+				if ( isset( $translation['language'], $translation['package'] ) ) {
+					$translation['type'] = 'plugin';
+					$translation['slug'] = isset( $update->slug ) ? $update->slug : $update->id;
+
+					$updates->translations[] = $translation;
+				}
+			}
+		}
+
+		unset( $updates->no_update[ $plugin_file ], $updates->response[ $plugin_file ] );
+
+		if ( version_compare( $update->new_version, $plugin_data['Version'], '>' ) ) {
+			$updates->response[ $plugin_file ] = $update;
+		} else {
+			$updates->no_update[ $plugin_file ] = $update;
+		}
+	}
+
+	$sanitize_plugin_update_payload = static function ( &$item ) {
+		$item = (object) $item;
+
+		unset( $item->translations, $item->compatibility );
+
+		return $item;
+	};
+
+	array_walk( $updates->response, $sanitize_plugin_update_payload );
+	array_walk( $updates->no_update, $sanitize_plugin_update_payload );
+
+	set_site_transient( 'update_plugins', $updates );
+}
+
+/**
+ * Checks for available updates to themes based on the latest versions hosted on WordPress.org.
+ *
+ * Despite its name this function does not actually perform any updates, it only checks for available updates.
+ *
+ * A list of all themes installed is sent to WP, along with the site locale.
+ *
+ * Checks against the WordPress server at api.wordpress.org. Will only check
+ * if WordPress isn't installing.
+ *
+ * @since 2.7.0
+ *
+ * @global string $wp_version The WordPress version string.
+ *
+ * @param array $extra_stats Extra statistics to report to the WordPress.org API.
+ */
+function wp_update_themes( $extra_stats = array() ) {
+	if ( wp_installing() ) {
+		return;
+	}
+
+	// Include an unmodified $wp_version.
+	require ABSPATH . WPINC . '/version.php';
+
+	$installed_themes = wp_get_themes();
+	$translations     = wp_get_installed_translations( 'themes' );
+
+	$last_update = get_site_transient( 'update_themes' );
+
+	if ( ! is_object( $last_update ) ) {
+		$last_update = new stdClass();
+	}
+
+	$themes  = array();
+	$checked = array();
+	$request = array();
+
+	// Put slug of active theme into request.
+	$request['active'] = get_option( 'stylesheet' );
+
+	foreach ( $installed_themes as $theme ) {
+		$checked[ $theme->get_stylesheet() ] = $theme->get( 'Version' );
+
+		$themes[ $theme->get_stylesheet() ] = array(
+			'Name'       => $theme->get( 'Name' ),
+			'Title'      => $theme->get( 'Name' ),
+			'Version'    => $theme->get( 'Version' ),
+			'Author'     => $theme->get( 'Author' ),
+			'Author URI' => $theme->get( 'AuthorURI' ),
+			'UpdateURI'  => $theme->get( 'UpdateURI' ),
+			'Template'   => $theme->get_template(),
+			'Stylesheet' => $theme->get_stylesheet(),
+		);
+	}
+
+	$doing_cron = wp_doing_cron();
+
+	// Check for update on a different schedule, depending on the page.
+	switch ( current_filter() ) {
+		case 'upgrader_process_complete':
+			$timeout = 0;
+			break;
+		case 'load-update-core.php':
+			$timeout = MINUTE_IN_SECONDS;
+			break;
+		case 'load-themes.php':
+		case 'load-update.php':
+			$timeout = HOUR_IN_SECONDS;
+			break;
+		default:
+			if ( $doing_cron ) {
+				$timeout = 2 * HOUR_IN_SECONDS;
+			} else {
+				$timeout = 12 * HOUR_IN_SECONDS;
+			}
+	}
+
+	$time_not_changed = isset( $last_update->last_checked ) && $timeout > ( time() - $last_update->last_checked );
+
+	if ( $time_not_changed && ! $extra_stats ) {
+		$theme_changed = false;
+
+		foreach ( $checked as $slug => $v ) {
+			if ( ! isset( $last_update->checked[ $slug ] ) || (string) $last_update->checked[ $slug ] !== (string) $v ) {
+				$theme_changed = true;
+			}
+		}
+
+		if ( isset( $last_update->response ) && is_array( $last_update->response ) ) {
+			foreach ( $last_update->response as $slug => $update_details ) {
+				if ( ! isset( $checked[ $slug ] ) ) {
+					$theme_changed = true;
+					break;
+				}
+			}
+		}
+
+		// Bail if we've checked recently and if nothing has changed.
+		if ( ! $theme_changed ) {
+			return;
+		}
+	}
+
+	// Update last_checked for current to prevent multiple blocking requests if request hangs.
+	$last_update->last_checked = time();
+	set_site_transient( 'update_themes', $last_update );
+
+	$request['themes'] = $themes;
+
+	$locales = array_values( get_available_languages() );
+
+	/**
+	 * Filters the locales requested for theme translations.
+	 *
+	 * @since 3.7.0
+	 * @since 4.5.0 The default value of the `$locales` parameter changed to include all locales.
+	 *
+	 * @param string[] $locales Theme locales. Default is all available locales of the site.
+	 */
+	$locales = apply_filters( 'themes_update_check_locales', $locales );
+	$locales = array_unique( $locales );
+
+	if ( $doing_cron ) {
+		$timeout = 30; // 30 seconds.
+	} else {
+		// Three seconds, plus one extra second for every 10 themes.
+		$timeout = 3 + (int) ( count( $themes ) / 10 );
+	}
+
+	$options = array(
+		'timeout'    => $timeout,
+		'body'       => array(
+			'themes'       => wp_json_encode( $request ),
+			'translations' => wp_json_encode( $translations ),
+			'locale'       => wp_json_encode( $locales ),
+		),
+		'user-agent' => 'WordPress/' . $wp_version . '; ' . home_url( '/' ),
+	);
+
+	if ( $extra_stats ) {
+		$options['body']['update_stats'] = wp_json_encode( $extra_stats );
+	}
+
+	$url      = 'http://api.wordpress.org/themes/update-check/1.1/';
+	$http_url = $url;
+	$ssl      = wp_http_supports( array( 'ssl' ) );
+
+	if ( $ssl ) {
+		$url = set_url_scheme( $url, 'https' );
+	}
+
+	$raw_response = wp_remote_post( $url, $options );
+
+	if ( $ssl && is_wp_error( $raw_response ) ) {
+		trigger_error(
+			sprintf(
+				/* translators: %s: Support forums URL. */
+				__( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server&#8217;s configuration. If you continue to have problems, please try the <a href="%s">support forums</a>.' ),
+				__( 'https://wordpress.org/support/forums/' )
+			) . ' ' . __( '(WordPress could not establish a secure connection to WordPress.org. Please contact your server administrator.)' ),
+			headers_sent() || WP_DEBUG ? E_USER_WARNING : E_USER_NOTICE
+		);
+		$raw_response = wp_remote_post( $http_url, $options );
+	}
+
+	if ( is_wp_error( $raw_response ) || 200 !== wp_remote_retrieve_response_code( $raw_response ) ) {
+		return;
+	}
+
+	$new_update               = new stdClass();
+	$new_update->last_checked = time();
+	$new_update->checked      = $checked;
+
+	$response = json_decode( wp_remote_retrieve_body( $raw_response ), true );
+
+	if ( is_array( $response ) ) {
+		$new_update->response     = $response['themes'];
+		$new_update->no_update    = $response['no_update'];
+		$new_update->translations = $response['translations'];
+	}
+
+	// Support updates for any themes using the `Update URI` header field.
+	foreach ( $themes as $theme_stylesheet => $theme_data ) {
+		if ( ! $theme_data['UpdateURI'] || isset( $new_update->response[ $theme_stylesheet ] ) ) {
+			continue;
+		}
+
+		$hostname = wp_parse_url( sanitize_url( $theme_data['UpdateURI'] ), PHP_URL_HOST );
+
+		/**
+		 * Filters the update response for a given theme hostname.
+		 *
+		 * The dynamic portion of the hook name, `$hostname`, refers to the hostname
+		 * of the URI specified in the `Update URI` header field.
+		 *
+		 * @since 6.1.0
+		 *
+		 * @param array|false $update {
+		 *     The theme update data with the latest details. Default false.
+		 *
+		 *     @type string $id           Optional. ID of the theme for update purposes, should be a URI
+		 *                                specified in the `Update URI` header field.
+		 *     @type string $theme        Directory name of the theme.
+		 *     @type string $version      The version of the theme.
+		 *     @type string $url          The URL for details of the theme.
+		 *     @type string $package      Optional. The update ZIP for the theme.
+		 *     @type string $tested       Optional. The version of WordPress the theme is tested against.
+		 *     @type string $requires_php Optional. The version of PHP which the theme requires.
+		 *     @type bool   $autoupdate   Optional. Whether the theme should automatically update.
+		 *     @type array  $translations {
+		 *         Optional. List of translation updates for the theme.
+		 *
+		 *         @type string $language   The language the translation update is for.
+		 *         @type string $version    The version of the theme this translation is for.
+		 *                                  This is not the version of the language file.
+		 *         @type string $updated    The update timestamp of the translation file.
+		 *                                  Should be a date in the `YYYY-MM-DD HH:MM:SS` format.
+		 *         @type string $package    The ZIP location containing the translation update.
+		 *         @type string $autoupdate Whether the translation should be automatically installed.
+		 *     }
+		 * }
+		 * @param array       $theme_data       Theme headers.
+		 * @param string      $theme_stylesheet Theme stylesheet.
+		 * @param string[]    $locales          Installed locales to look up translations for.
+		 */
+		$update = apply_filters( "update_themes_{$hostname}", false, $theme_data, $theme_stylesheet, $locales );
+
+		if ( ! $update ) {
+			continue;
+		}
+
+		$update = (object) $update;
+
+		// Is it valid? We require at least a version.
+		if ( ! isset( $update->version ) ) {
+			continue;
+		}
+
+		// This should remain constant.
+		$update->id = $theme_data['UpdateURI'];
+
+		// WordPress needs the version field specified as 'new_version'.
+		if ( ! isset( $update->new_version ) ) {
+			$update->new_version = $update->version;
+		}
+
+		// Handle any translation updates.
+		if ( ! empty( $update->translations ) ) {
+			foreach ( $update->translations as $translation ) {
+				if ( isset( $translation['language'], $translation['package'] ) ) {
+					$translation['type'] = 'theme';
+					$translation['slug'] = isset( $update->theme ) ? $update->theme : $update->id;
+
+					$new_update->translations[] = $translation;
+				}
+			}
+		}
+
+		unset( $new_update->no_update[ $theme_stylesheet ], $new_update->response[ $theme_stylesheet ] );
+
+		if ( version_compare( $update->new_version, $theme_data['Version'], '>' ) ) {
+			$new_update->response[ $theme_stylesheet ] = (array) $update;
+		} else {
+			$new_update->no_update[ $theme_stylesheet ] = (array) $update;
+		}
+	}
+
+	set_site_transient( 'update_themes', $new_update );
+}
+
+/**
+ * Performs WordPress automatic background updates.
+ *
+ * Updates WordPress core plus any plugins and themes that have automatic updates enabled.
+ *
+ * @since 3.7.0
+ */
+function wp_maybe_auto_update() {
+	require_once ABSPATH . 'wp-admin/includes/admin.php';
+	require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
+
+	$upgrader = new WP_Automatic_Updater();
+	$upgrader->run();
+}
+
+/**
+ * Retrieves a list of all language updates available.
+ *
+ * @since 3.7.0
+ *
+ * @return object[] Array of translation objects that have available updates.
+ */
+function wp_get_translation_updates() {
+	$updates    = array();
+	$transients = array(
+		'update_core'    => 'core',
+		'update_plugins' => 'plugin',
+		'update_themes'  => 'theme',
+	);
+
+	foreach ( $transients as $transient => $type ) {
+		$transient = get_site_transient( $transient );
+
+		if ( empty( $transient->translations ) ) {
+			continue;
+		}
+
+		foreach ( $transient->translations as $translation ) {
+			$updates[] = (object) $translation;
+		}
+	}
+
+	return $updates;
+}
+
+/**
+ * Collects counts and UI strings for available updates.
+ *
+ * @since 3.3.0
+ *
+ * @return array
+ */
+function wp_get_update_data() {
+	$counts = array(
+		'plugins'      => 0,
+		'themes'       => 0,
+		'wordpress'    => 0,
+		'translations' => 0,
+	);
+
+	$plugins = current_user_can( 'update_plugins' );
+
+	if ( $plugins ) {
+		$update_plugins = get_site_transient( 'update_plugins' );
+
+		if ( ! empty( $update_plugins->response ) ) {
+			$counts['plugins'] = count( $update_plugins->response );
+		}
+	}
+
+	$themes = current_user_can( 'update_themes' );
+
+	if ( $themes ) {
+		$update_themes = get_site_transient( 'update_themes' );
+
+		if ( ! empty( $update_themes->response ) ) {
+			$counts['themes'] = count( $update_themes->response );
+		}
+	}
+
+	$core = current_user_can( 'update_core' );
+
+	if ( $core && function_exists( 'get_core_updates' ) ) {
+		$update_wordpress = get_core_updates( array( 'dismissed' => false ) );
+
+		if ( ! empty( $update_wordpress )
+			&& ! in_array( $update_wordpress[0]->response, array( 'development', 'latest' ), true )
+			&& current_user_can( 'update_core' )
+		) {
+			$counts['wordpress'] = 1;
+		}
+	}
+
+	if ( ( $core || $plugins || $themes ) && wp_get_translation_updates() ) {
+		$counts['translations'] = 1;
+	}
+
+	$counts['total'] = $counts['plugins'] + $counts['themes'] + $counts['wordpress'] + $counts['translations'];
+	$titles          = array();
+
+	if ( $counts['wordpress'] ) {
+		/* translators: %d: Number of available WordPress updates. */
+		$titles['wordpress'] = sprintf( __( '%d WordPress Update' ), $counts['wordpress'] );
+	}
+
+	if ( $counts['plugins'] ) {
+		/* translators: %d: Number of available plugin updates. */
+		$titles['plugins'] = sprintf( _n( '%d Plugin Update', '%d Plugin Updates', $counts['plugins'] ), $counts['plugins'] );
+	}
+
+	if ( $counts['themes'] ) {
+		/* translators: %d: Number of available theme updates. */
+		$titles['themes'] = sprintf( _n( '%d Theme Update', '%d Theme Updates', $counts['themes'] ), $counts['themes'] );
+	}
+
+	if ( $counts['translations'] ) {
+		$titles['translations'] = __( 'Translation Updates' );
+	}
+
+	$update_title = $titles ? esc_attr( implode( ', ', $titles ) ) : '';
+
+	$update_data = array(
+		'counts' => $counts,
+		'title'  => $update_title,
+	);
+	/**
+	 * Filters the returned array of update data for plugins, themes, and WordPress core.
+	 *
+	 * @since 3.5.0
+	 *
+	 * @param array $update_data {
+	 *     Fetched update data.
+	 *
+	 *     @type array   $counts       An array of counts for available plugin, theme, and WordPress updates.
+	 *     @type string  $update_title Titles of available updates.
+	 * }
+	 * @param array $titles An array of update counts and UI strings for available updates.
+	 */
+	return apply_filters( 'wp_get_update_data', $update_data, $titles );
+}
+
+/**
+ * Determines whether core should be updated.
+ *
+ * @since 2.8.0
+ *
+ * @global string $wp_version The WordPress version string.
+ */
+function _maybe_update_core() {
+	// Include an unmodified $wp_version.
+	require ABSPATH . WPINC . '/version.php';
+
+	$current = get_site_transient( 'update_core' );
+
+	if ( isset( $current->last_checked, $current->version_checked )
+		&& 12 * HOUR_IN_SECONDS > ( time() - $current->last_checked )
+		&& $current->version_checked === $wp_version
+	) {
+		return;
+	}
+
+	wp_version_check();
+}
+/**
+ * Checks the last time plugins were run before checking plugin versions.
+ *
+ * This might have been backported to WordPress 2.6.1 for performance reasons.
+ * This is used for the wp-admin to check only so often instead of every page
+ * load.
+ *
+ * @since 2.7.0
+ * @access private
+ */
+function _maybe_update_plugins() {
+	$current = get_site_transient( 'update_plugins' );
+
+	if ( isset( $current->last_checked )
+		&& 12 * HOUR_IN_SECONDS > ( time() - $current->last_checked )
+	) {
+		return;
+	}
+
+	wp_update_plugins();
+}
+
+/**
+ * Checks themes versions only after a duration of time.
+ *
+ * This is for performance reasons to make sure that on the theme version
+ * checker is not run on every page load.
+ *
+ * @since 2.7.0
+ * @access private
+ */
+function _maybe_update_themes() {
+	$current = get_site_transient( 'update_themes' );
+
+	if ( isset( $current->last_checked )
+		&& 12 * HOUR_IN_SECONDS > ( time() - $current->last_checked )
+	) {
+		return;
+	}
+
+	wp_update_themes();
+}
+
+/**
+ * Schedules core, theme, and plugin update checks.
+ *
+ * @since 3.1.0
+ */
+function wp_schedule_update_checks() {
+	if ( ! wp_next_scheduled( 'wp_version_check' ) && ! wp_installing() ) {
+		wp_schedule_event( time(), 'twicedaily', 'wp_version_check' );
+	}
+
+	if ( ! wp_next_scheduled( 'wp_update_plugins' ) && ! wp_installing() ) {
+		wp_schedule_event( time(), 'twicedaily', 'wp_update_plugins' );
+	}
+
+	if ( ! wp_next_scheduled( 'wp_update_themes' ) && ! wp_installing() ) {
+		wp_schedule_event( time(), 'twicedaily', 'wp_update_themes' );
+	}
+}
+
+/**
+ * Clears existing update caches for plugins, themes, and core.
+ *
+ * @since 4.1.0
+ */
+function wp_clean_update_cache() {
+	if ( function_exists( 'wp_clean_plugins_cache' ) ) {
+		wp_clean_plugins_cache();
+	} else {
+		delete_site_transient( 'update_plugins' );
+	}
+
+	wp_clean_themes_cache();
+
+	delete_site_transient( 'update_core' );
+}
+
+/**
+ * Schedules the removal of all contents in the temporary backup directory.
+ *
+ * @since 6.3.0
+ */
+function wp_delete_all_temp_backups() {
+	/*
+	 * Check if there is a lock, or if currently performing an Ajax request,
+	 * in which case there is a chance an update is running.
+	 * Reschedule for an hour from now and exit early.
+	 */
+	if ( get_option( 'core_updater.lock' ) || get_option( 'auto_updater.lock' ) || wp_doing_ajax() ) {
+		wp_schedule_single_event( time() + HOUR_IN_SECONDS, 'wp_delete_temp_updater_backups' );
+		return;
+	}
+
+	// This action runs on shutdown to make sure there are no plugin updates currently running.
+	add_action( 'shutdown', '_wp_delete_all_temp_backups' );
+}
+
+/**
+ * Deletes all contents in the temporary backup directory.
+ *
+ * @since 6.3.0
+ *
+ * @access private
+ *
+ * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass.
+ *
+ * @return void|WP_Error Void on success, or a WP_Error object on failure.
+ */
+function _wp_delete_all_temp_backups() {
+	global $wp_filesystem;
+
+	if ( ! function_exists( 'WP_Filesystem' ) ) {
+		require_once ABSPATH . '/wp-admin/includes/file.php';
+	}
+
+	ob_start();
+	$credentials = request_filesystem_credentials( '' );
+	ob_end_clean();
+
+	if ( false === $credentials || ! WP_Filesystem( $credentials ) ) {
+		return new WP_Error( 'fs_unavailable', __( 'Could not access filesystem.' ) );
+	}
+
+	if ( ! $wp_filesystem->wp_content_dir() ) {
+		return new WP_Error(
+			'fs_no_content_dir',
+			/* translators: %s: Directory name. */
+			sprintf( __( 'Unable to locate WordPress content directory (%s).' ), 'wp-content' )
+		);
+	}
+
+	$temp_backup_dir = $wp_filesystem->wp_content_dir() . 'upgrade-temp-backup/';
+	$dirlist         = $wp_filesystem->dirlist( $temp_backup_dir );
+	$dirlist         = $dirlist ? $dirlist : array();
+
+	foreach ( array_keys( $dirlist ) as $dir ) {
+		if ( '.' === $dir || '..' === $dir ) {
+			continue;
+		}
+
+		$wp_filesystem->delete( $temp_backup_dir . $dir, true );
+	}
+}
+
+if ( ( ! is_main_site() && ! is_network_admin() ) || wp_doing_ajax() ) {
+	return;
+}
+
+add_action( 'admin_init', '_maybe_update_core' );
+add_action( 'wp_version_check', 'wp_version_check' );
+
+add_action( 'load-plugins.php', 'wp_update_plugins' );
+add_action( 'load-update.php', 'wp_update_plugins' );
+add_action( 'load-update-core.php', 'wp_update_plugins' );
+add_action( 'admin_init', '_maybe_update_plugins' );
+add_action( 'wp_update_plugins', 'wp_update_plugins' );
+
+add_action( 'load-themes.php', 'wp_update_themes' );
+add_action( 'load-update.php', 'wp_update_themes' );
+add_action( 'load-update-core.php', 'wp_update_themes' );
+add_action( 'admin_init', '_maybe_update_themes' );
+add_action( 'wp_update_themes', 'wp_update_themes' );
+
+add_action( 'update_option_WPLANG', 'wp_clean_update_cache', 10, 0 );
+
+add_action( 'wp_maybe_auto_update', 'wp_maybe_auto_update' );
+
+add_action( 'init', 'wp_schedule_update_checks' );
+
+add_action( 'wp_delete_temp_updater_backups', 'wp_delete_all_temp_backups' );