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File://proc/thread-self/root/usr/local/sitepad/editor/site-admin/includes/class-wp-automatic-updater.php

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

/**
 * Core class used for handling automatic background updates.
 *
 * @since 3.7.0
 * @since 4.6.0 Moved to its own file from site-admin/includes/class-wp-upgrader.php.
 */
class WP_Automatic_Updater {

	/**
	 * Tracks update results during processing.
	 *
	 * @var array
	 */
	protected $update_results = array();

	/**
	 * Whether the entire automatic updater is disabled.
	 *
	 * @since 3.7.0
	 */
	public function is_disabled() {
		// Background updates are disabled if you don't want file changes.
		if ( ! wp_is_file_mod_allowed( 'automatic_updater' ) ) {
			return true;
		}

		if ( wp_installing() ) {
			return true;
		}

		// More fine grained control can be done through the WP_AUTO_UPDATE_CORE constant and filters.
		$disabled = defined( 'AUTOMATIC_UPDATER_DISABLED' ) && AUTOMATIC_UPDATER_DISABLED;

		/**
		 * Filters whether to entirely disable background updates.
		 *
		 * There are more fine-grained filters and controls for selective disabling.
		 * This filter parallels the AUTOMATIC_UPDATER_DISABLED constant in name.
		 *
		 * This also disables update notification emails. That may change in the future.
		 *
		 * @since 3.7.0
		 *
		 * @param bool $disabled Whether the updater should be disabled.
		 */
		return apply_filters( 'automatic_updater_disabled', $disabled );
	}

	/**
	 * Check for version control checkouts.
	 *
	 * Checks for Subversion, Git, Mercurial, and Bazaar. It recursively looks up the
	 * filesystem to the top of the drive, erring on the side of detecting a VCS
	 * checkout somewhere.
	 *
	 * ABSPATH is always checked in addition to whatever $context is (which may be the
	 * wp-content directory, for example). The underlying assumption is that if you are
	 * using version control *anywhere*, then you should be making decisions for
	 * how things get updated.
	 *
	 * @since 3.7.0
	 *
	 * @param string $context The filesystem path to check, in addition to ABSPATH.
	 */
	public function is_vcs_checkout( $context ) {
		$context_dirs = array( untrailingslashit( $context ) );
		if ( $context !== ABSPATH ) {
			$context_dirs[] = untrailingslashit( ABSPATH );
		}

		$vcs_dirs   = array( '.svn', '.git', '.hg', '.bzr' );
		$check_dirs = array();

		foreach ( $context_dirs as $context_dir ) {
			// Walk up from $context_dir to the root.
			do {
				$check_dirs[] = $context_dir;

				// Once we've hit '/' or 'C:\', we need to stop. dirname will keep returning the input here.
				if ( $context_dir == dirname( $context_dir ) ) {
					break;
				}

				// Continue one level at a time.
			} while ( $context_dir = dirname( $context_dir ) );
		}

		$check_dirs = array_unique( $check_dirs );

		// Search all directories we've found for evidence of version control.
		foreach ( $vcs_dirs as $vcs_dir ) {
			foreach ( $check_dirs as $check_dir ) {
				if ( $checkout = @is_dir( rtrim( $check_dir, '\\/' ) . "/$vcs_dir" ) ) {
					break 2;
				}
			}
		}

		/**
		 * Filters whether the automatic updater should consider a filesystem
		 * location to be potentially managed by a version control system.
		 *
		 * @since 3.7.0
		 *
		 * @param bool $checkout  Whether a VCS checkout was discovered at $context
		 *                        or ABSPATH, or anywhere higher.
		 * @param string $context The filesystem context (a path) against which
		 *                        filesystem status should be checked.
		 */
		return apply_filters( 'automatic_updates_is_vcs_checkout', $checkout, $context );
	}

	/**
	 * Tests to see if we can and should update a specific item.
	 *
	 * @since 3.7.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @param string $type    The type of update being checked: 'core', 'theme',
	 *                        'plugin', 'translation'.
	 * @param object $item    The update offer.
	 * @param string $context The filesystem context (a path) against which filesystem
	 *                        access and status should be checked.
	 */
	public function should_update( $type, $item, $context ) {
		// Used to see if WP_Filesystem is set up to allow unattended updates.
		$skin = new Automatic_Upgrader_Skin;

		if ( $this->is_disabled() ) {
			return false;
		}

		// Only relax the filesystem checks when the update doesn't include new files
		$allow_relaxed_file_ownership = false;
		if ( 'core' == $type && isset( $item->new_files ) && ! $item->new_files ) {
			$allow_relaxed_file_ownership = true;
		}

		// If we can't do an auto core update, we may still be able to email the user.
		if ( ! $skin->request_filesystem_credentials( false, $context, $allow_relaxed_file_ownership ) || $this->is_vcs_checkout( $context ) ) {
			if ( 'core' == $type ) {
				$this->send_core_update_notification_email( $item );
			}
			return false;
		}

		// Next up, is this an item we can update?
		if ( 'core' == $type ) {
			$update = Core_Upgrader::should_update_to_version( $item->current );
		} else {
			$update = ! empty( $item->autoupdate );
		}

		/**
		 * Filters whether to automatically update core, a plugin, a theme, or a language.
		 *
		 * The dynamic portion of the hook name, `$type`, refers to the type of update
		 * being checked. Can be 'core', 'theme', 'plugin', or 'translation'.
		 *
		 * Generally speaking, plugins, themes, and major core versions are not updated
		 * by default, while translations and minor and development versions for core
		 * are updated by default.
		 *
		 * See the {@see 'allow_dev_auto_core_updates'}, {@see 'allow_minor_auto_core_updates'},
		 * and {@see 'allow_major_auto_core_updates'} filters for a more straightforward way to
		 * adjust core updates.
		 *
		 * @since 3.7.0
		 *
		 * @param bool   $update Whether to update.
		 * @param object $item   The update offer.
		 */
		$update = apply_filters( "auto_update_{$type}", $update, $item );

		if ( ! $update ) {
			if ( 'core' == $type ) {
				$this->send_core_update_notification_email( $item );
			}
			return false;
		}

		// If it's a core update, are we actually compatible with its requirements?
		if ( 'core' == $type ) {
			global $wpdb;

			$php_compat = version_compare( phpversion(), $item->php_version, '>=' );
			if ( file_exists( WP_CONTENT_DIR . '/db.php' ) && empty( $wpdb->is_mysql ) ) {
				$mysql_compat = true;
			} else {
				$mysql_compat = version_compare( $wpdb->db_version(), $item->mysql_version, '>=' );
			}

			if ( ! $php_compat || ! $mysql_compat ) {
				return false;
			}
		}

		return true;
	}

	/**
	 * Notifies an administrator of a core update.
	 *
	 * @since 3.7.0
	 *
	 * @param object $item The update offer.
	 */
	protected function send_core_update_notification_email( $item ) {
		$notified = get_site_option( 'auto_core_update_notified' );

		// Don't notify if we've already notified the same email address of the same version.
		if ( $notified && $notified['email'] == get_site_option( 'admin_email' ) && $notified['version'] == $item->current ) {
			return false;
		}

		// See if we need to notify users of a core update.
		$notify = ! empty( $item->notify_email );

		/**
		 * Filters whether to notify the site administrator of a new core update.
		 *
		 * By default, administrators are notified when the update offer received
		 * from WordPress.org sets a particular flag. This allows some discretion
		 * in if and when to notify.
		 *
		 * This filter is only evaluated once per release. If the same email address
		 * was already notified of the same new version, WordPress won't repeatedly
		 * email the administrator.
		 *
		 * This filter is also used on about.php to check if a plugin has disabled
		 * these notifications.
		 *
		 * @since 3.7.0
		 *
		 * @param bool   $notify Whether the site administrator is notified.
		 * @param object $item   The update offer.
		 */
		if ( ! apply_filters( 'send_core_update_notification_email', $notify, $item ) ) {
			return false;
		}

		$this->send_email( 'manual', $item );
		return true;
	}

	/**
	 * Update an item, if appropriate.
	 *
	 * @since 3.7.0
	 *
	 * @param string $type The type of update being checked: 'core', 'theme', 'plugin', 'translation'.
	 * @param object $item The update offer.
	 *
	 * @return null|WP_Error
	 */
	public function update( $type, $item ) {
		$skin = new Automatic_Upgrader_Skin;

		switch ( $type ) {
			case 'core':
				// The Core upgrader doesn't use the Upgrader's skin during the actual main part of the upgrade, instead, firing a filter.
				add_filter( 'update_feedback', array( $skin, 'feedback' ) );
				$upgrader = new Core_Upgrader( $skin );
				$context  = ABSPATH;
				break;
			case 'plugin':
				$upgrader = new Plugin_Upgrader( $skin );
				$context  = WP_PLUGIN_DIR; // We don't support custom Plugin directories, or updates for WPMU_PLUGIN_DIR
				break;
			case 'theme':
				$upgrader = new Theme_Upgrader( $skin );
				$context  = get_theme_root( $item->theme );
				break;
			case 'translation':
				$upgrader = new Language_Pack_Upgrader( $skin );
				$context  = WP_CONTENT_DIR; // WP_LANG_DIR;
				break;
		}

		// Determine whether we can and should perform this update.
		if ( ! $this->should_update( $type, $item, $context ) ) {
			return false;
		}

		/**
		 * Fires immediately prior to an auto-update.
		 *
		 * @since 4.4.0
		 *
		 * @param string $type    The type of update being checked: 'core', 'theme', 'plugin', or 'translation'.
		 * @param object $item    The update offer.
		 * @param string $context The filesystem context (a path) against which filesystem access and status
		 *                        should be checked.
		 */
		do_action( 'pre_auto_update', $type, $item, $context );

		$upgrader_item = $item;
		switch ( $type ) {
			case 'core':
				/* translators: %s: WordPress version */
				$skin->feedback( __( 'Updating to WordPress %s' ), $item->version );
				/* translators: %s: WordPress version */
				$item_name = sprintf( __( 'WordPress %s' ), $item->version );
				break;
			case 'theme':
				$upgrader_item = $item->theme;
				$theme         = wp_get_theme( $upgrader_item );
				$item_name     = $theme->Get( 'Name' );
				/* translators: %s: Theme name */
				$skin->feedback( __( 'Updating theme: %s' ), $item_name );
				break;
			case 'plugin':
				$upgrader_item = $item->plugin;
				$plugin_data   = get_plugin_data( $context . '/' . $upgrader_item );
				$item_name     = $plugin_data['Name'];
				/* translators: %s: Plugin name */
				$skin->feedback( __( 'Updating plugin: %s' ), $item_name );
				break;
			case 'translation':
				$language_item_name = $upgrader->get_name_for_update( $item );
				/* translators: %s: Name of language item */
				$item_name = sprintf( __( 'Translations for %s' ), $language_item_name );
				/* translators: 1: Name of language item, 2: Language */
				$skin->feedback( sprintf( __( 'Updating translations for %1$s (%2$s)&#8230;' ), $language_item_name, $item->language ) );
				break;
		}

		$allow_relaxed_file_ownership = false;
		if ( 'core' == $type && isset( $item->new_files ) && ! $item->new_files ) {
			$allow_relaxed_file_ownership = true;
		}

		// Boom, This sites about to get a whole new splash of paint!
		$upgrade_result = $upgrader->upgrade(
			$upgrader_item,
			array(
				'clear_update_cache'           => false,
				// Always use partial builds if possible for core updates.
				'pre_check_md5'                => false,
				// Only available for core updates.
				'attempt_rollback'             => true,
				// Allow relaxed file ownership in some scenarios
				'allow_relaxed_file_ownership' => $allow_relaxed_file_ownership,
			)
		);

		// If the filesystem is unavailable, false is returned.
		if ( false === $upgrade_result ) {
			$upgrade_result = new WP_Error( 'fs_unavailable', __( 'Could not access filesystem.' ) );
		}

		if ( 'core' == $type ) {
			if ( is_wp_error( $upgrade_result ) && ( 'up_to_date' == $upgrade_result->get_error_code() || 'locked' == $upgrade_result->get_error_code() ) ) {
				// These aren't actual errors, treat it as a skipped-update instead to avoid triggering the post-core update failure routines.
				return false;
			}

			// Core doesn't output this, so let's append it so we don't get confused.
			if ( is_wp_error( $upgrade_result ) ) {
				$skin->error( __( 'Installation Failed' ), $upgrade_result );
			} else {
				$skin->feedback( __( 'WordPress updated successfully' ) );
			}
		}

		$this->update_results[ $type ][] = (object) array(
			'item'     => $item,
			'result'   => $upgrade_result,
			'name'     => $item_name,
			'messages' => $skin->get_upgrade_messages(),
		);

		return $upgrade_result;
	}

	/**
	 * Kicks off the background update process, looping through all pending updates.
	 *
	 * @since 3.7.0
	 */
	public function run() {
		if ( $this->is_disabled() ) {
			return;
		}

		if ( ! is_main_network() || ! is_main_site() ) {
			return;
		}

		if ( ! WP_Upgrader::create_lock( 'auto_updater' ) ) {
			return;
		}

		// Don't automatically run these thins, as we'll handle it ourselves
		remove_action( 'upgrader_process_complete', array( 'Language_Pack_Upgrader', 'async_upgrade' ), 20 );
		remove_action( 'upgrader_process_complete', 'wp_version_check' );
		remove_action( 'upgrader_process_complete', 'wp_update_plugins' );
		remove_action( 'upgrader_process_complete', 'wp_update_themes' );

		// Next, Plugins
		wp_update_plugins(); // Check for Plugin updates
		$plugin_updates = get_site_transient( 'update_plugins' );
		if ( $plugin_updates && ! empty( $plugin_updates->response ) ) {
			foreach ( $plugin_updates->response as $plugin ) {
				$this->update( 'plugin', $plugin );
			}
			// Force refresh of plugin update information
			wp_clean_plugins_cache();
		}

		// Next, those themes we all love
		wp_update_themes();  // Check for Theme updates
		$theme_updates = get_site_transient( 'update_themes' );
		if ( $theme_updates && ! empty( $theme_updates->response ) ) {
			foreach ( $theme_updates->response as $theme ) {
				$this->update( 'theme', (object) $theme );
			}
			// Force refresh of theme update information
			wp_clean_themes_cache();
		}

		// Next, Process any core update
		wp_version_check(); // Check for Core updates
		$core_update = find_core_auto_update();

		if ( $core_update ) {
			$this->update( 'core', $core_update );
		}

		// Clean up, and check for any pending translations
		// (Core_Upgrader checks for core updates)
		$theme_stats = array();
		if ( isset( $this->update_results['theme'] ) ) {
			foreach ( $this->update_results['theme'] as $upgrade ) {
				$theme_stats[ $upgrade->item->theme ] = ( true === $upgrade->result );
			}
		}
		wp_update_themes( $theme_stats );  // Check for Theme updates

		$plugin_stats = array();
		if ( isset( $this->update_results['plugin'] ) ) {
			foreach ( $this->update_results['plugin'] as $upgrade ) {
				$plugin_stats[ $upgrade->item->plugin ] = ( true === $upgrade->result );
			}
		}
		wp_update_plugins( $plugin_stats ); // Check for Plugin updates

		// Finally, Process any new translations
		$language_updates = wp_get_translation_updates();
		if ( $language_updates ) {
			foreach ( $language_updates as $update ) {
				$this->update( 'translation', $update );
			}

			// Clear existing caches
			wp_clean_update_cache();

			wp_version_check();  // check for Core updates
			wp_update_themes();  // Check for Theme updates
			wp_update_plugins(); // Check for Plugin updates
		}

		// Send debugging email to admin for all development installations.
		if ( ! empty( $this->update_results ) ) {
			$development_version = false !== strpos( get_bloginfo( 'version' ), '-' );

			/**
			 * Filters whether to send a debugging email for each automatic background update.
			 *
			 * @since 3.7.0
			 *
			 * @param bool $development_version By default, emails are sent if the
			 *                                  install is a development version.
			 *                                  Return false to avoid the email.
			 */
			if ( apply_filters( 'automatic_updates_send_debug_email', $development_version ) ) {
				$this->send_debug_email();
			}

			if ( ! empty( $this->update_results['core'] ) ) {
				$this->after_core_update( $this->update_results['core'][0] );
			}

			/**
			 * Fires after all automatic updates have run.
			 *
			 * @since 3.8.0
			 *
			 * @param array $update_results The results of all attempted updates.
			 */
			do_action( 'automatic_updates_complete', $this->update_results );
		}

		WP_Upgrader::release_lock( 'auto_updater' );
	}

	/**
	 * If we tried to perform a core update, check if we should send an email,
	 * and if we need to avoid processing future updates.
	 *
	 * @since 3.7.0
	 *
	 * @param object $update_result The result of the core update. Includes the update offer and result.
	 */
	protected function after_core_update( $update_result ) {
		$wp_version = get_bloginfo( 'version' );

		$core_update = $update_result->item;
		$result      = $update_result->result;

		if ( ! is_wp_error( $result ) ) {
			$this->send_email( 'success', $core_update );
			return;
		}

		$error_code = $result->get_error_code();

		// Any of these WP_Error codes are critical failures, as in they occurred after we started to copy core files.
		// We should not try to perform a background update again until there is a successful one-click update performed by the user.
		$critical = false;
		if ( $error_code === 'disk_full' || false !== strpos( $error_code, '__copy_dir' ) ) {
			$critical = true;
		} elseif ( $error_code === 'rollback_was_required' && is_wp_error( $result->get_error_data()->rollback ) ) {
			// A rollback is only critical if it failed too.
			$critical        = true;
			$rollback_result = $result->get_error_data()->rollback;
		} elseif ( false !== strpos( $error_code, 'do_rollback' ) ) {
			$critical = true;
		}

		if ( $critical ) {
			$critical_data = array(
				'attempted'  => $core_update->current,
				'current'    => $wp_version,
				'error_code' => $error_code,
				'error_data' => $result->get_error_data(),
				'timestamp'  => time(),
				'critical'   => true,
			);
			if ( isset( $rollback_result ) ) {
				$critical_data['rollback_code'] = $rollback_result->get_error_code();
				$critical_data['rollback_data'] = $rollback_result->get_error_data();
			}
			update_site_option( 'auto_core_update_failed', $critical_data );
			$this->send_email( 'critical', $core_update, $result );
			return;
		}

		/*
		 * Any other WP_Error code (like download_failed or files_not_writable) occurs before
		 * we tried to copy over core files. Thus, the failures are early and graceful.
		 *
		 * We should avoid trying to perform a background update again for the same version.
		 * But we can try again if another version is released.
		 *
		 * For certain 'transient' failures, like download_failed, we should allow retries.
		 * In fact, let's schedule a special update for an hour from now. (It's possible
		 * the issue could actually be on WordPress.org's side.) If that one fails, then email.
		 */
		$send               = true;
		$transient_failures = array( 'incompatible_archive', 'download_failed', 'insane_distro', 'locked' );
		if ( in_array( $error_code, $transient_failures ) && ! get_site_option( 'auto_core_update_failed' ) ) {
			wp_schedule_single_event( time() + HOUR_IN_SECONDS, 'wp_maybe_auto_update' );
			$send = false;
		}

		$n = get_site_option( 'auto_core_update_notified' );
		// Don't notify if we've already notified the same email address of the same version of the same notification type.
		if ( $n && 'fail' == $n['type'] && $n['email'] == get_site_option( 'admin_email' ) && $n['version'] == $core_update->current ) {
			$send = false;
		}

		update_site_option(
			'auto_core_update_failed',
			array(
				'attempted'  => $core_update->current,
				'current'    => $wp_version,
				'error_code' => $error_code,
				'error_data' => $result->get_error_data(),
				'timestamp'  => time(),
				'retry'      => in_array( $error_code, $transient_failures ),
			)
		);

		if ( $send ) {
			$this->send_email( 'fail', $core_update, $result );
		}
	}

	/**
	 * Sends an email upon the completion or failure of a background core update.
	 *
	 * @since 3.7.0
	 *
	 * @param string $type        The type of email to send. Can be one of 'success', 'fail', 'manual', 'critical'.
	 * @param object $core_update The update offer that was attempted.
	 * @param mixed  $result      Optional. The result for the core update. Can be WP_Error.
	 */
	protected function send_email( $type, $core_update, $result = null ) {
		update_site_option(
			'auto_core_update_notified',
			array(
				'type'      => $type,
				'email'     => get_site_option( 'admin_email' ),
				'version'   => $core_update->current,
				'timestamp' => time(),
			)
		);

		$next_user_core_update = get_preferred_from_update_core();
		// If the update transient is empty, use the update we just performed
		if ( ! $next_user_core_update ) {
			$next_user_core_update = $core_update;
		}
		$newer_version_available = ( 'upgrade' == $next_user_core_update->response && version_compare( $next_user_core_update->version, $core_update->version, '>' ) );

		/**
		 * Filters whether to send an email following an automatic background core update.
		 *
		 * @since 3.7.0
		 *
		 * @param bool   $send        Whether to send the email. Default true.
		 * @param string $type        The type of email to send. Can be one of
		 *                            'success', 'fail', 'critical'.
		 * @param object $core_update The update offer that was attempted.
		 * @param mixed  $result      The result for the core update. Can be WP_Error.
		 */
		if ( 'manual' !== $type && ! apply_filters( 'auto_core_update_send_email', true, $type, $core_update, $result ) ) {
			return;
		}

		switch ( $type ) {
			case 'success': // We updated.
				/* translators: 1: Site name, 2: WordPress version number. */
				$subject = __( '[%1$s] Your site has updated to WordPress %2$s' );
				break;

			case 'fail':   // We tried to update but couldn't.
			case 'manual': // We can't update (and made no attempt).
				/* translators: 1: Site name, 2: WordPress version number. */
				$subject = __( '[%1$s] WordPress %2$s is available. Please update!' );
				break;

			case 'critical': // We tried to update, started to copy files, then things went wrong.
				/* translators: 1: Site name. */
				$subject = __( '[%1$s] URGENT: Your site may be down due to a failed update' );
				break;

			default:
				return;
		}

		// If the auto update is not to the latest version, say that the current version of WP is available instead.
		$version = 'success' === $type ? $core_update->current : $next_user_core_update->current;
		$subject = sprintf( $subject, wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES ), $version );

		$body = '';

		switch ( $type ) {
			case 'success':
				/* translators: 1: Home URL, 2: WordPress version */
				$body .= sprintf( __( 'Howdy! Your site at %1$s has been updated automatically to WordPress %2$s.' ), home_url(), $core_update->current );
				$body .= "\n\n";
				if ( ! $newer_version_available ) {
					$body .= __( 'No further action is needed on your part.' ) . ' ';
				}

				// Can only reference the About screen if their update was successful.
				list( $about_version ) = explode( '-', $core_update->current, 2 );
				/* translators: %s: WordPress core version */
				$body .= sprintf( __( 'For more on version %s, see the About WordPress screen:' ), $about_version );
				$body .= "\n" . admin_url( 'about.php' );

				if ( $newer_version_available ) {
					/* translators: %s: WordPress core latest version */
					$body .= "\n\n" . sprintf( __( 'WordPress %s is also now available.' ), $next_user_core_update->current ) . ' ';
					$body .= __( 'Updating is easy and only takes a few moments:' );
					$body .= "\n" . network_admin_url( 'update-core.php' );
				}

				break;

			case 'fail':
			case 'manual':
				/* translators: 1: Home URL, 2: WordPress core latest version */
				$body .= sprintf( __( 'Please update your site at %1$s to WordPress %2$s.' ), home_url(), $next_user_core_update->current );

				$body .= "\n\n";

				// Don't show this message if there is a newer version available.
				// Potential for confusion, and also not useful for them to know at this point.
				if ( 'fail' == $type && ! $newer_version_available ) {
					$body .= __( 'We tried but were unable to update your site automatically.' ) . ' ';
				}

				$body .= __( 'Updating is easy and only takes a few moments:' );
				$body .= "\n" . network_admin_url( 'update-core.php' );
				break;

			case 'critical':
				if ( $newer_version_available ) {
					/* translators: 1: Home URL, 2: WordPress core latest version */
					$body .= sprintf( __( 'Your site at %1$s experienced a critical failure while trying to update WordPress to version %2$s.' ), home_url(), $core_update->current );
				} else {
					/* translators: 1: Home URL, 2: Core update version */
					$body .= sprintf( __( 'Your site at %1$s experienced a critical failure while trying to update to the latest version of WordPress, %2$s.' ), home_url(), $core_update->current );
				}

				$body .= "\n\n" . __( "This means your site may be offline or broken. Don't panic; this can be fixed." );

				$body .= "\n\n" . __( "Please check out your site now. It's possible that everything is working. If it says you need to update, you should do so:" );
				$body .= "\n" . network_admin_url( 'update-core.php' );
				break;
		}

		$critical_support = 'critical' === $type && ! empty( $core_update->support_email );
		if ( $critical_support ) {
			// Support offer if available.
			/* translators: %s: Support e-mail */
			$body .= "\n\n" . sprintf( __( 'The WordPress team is willing to help you. Forward this email to %s and the team will work with you to make sure your site is working.' ), $core_update->support_email );
		} else {
			// Add a note about the support forums.
			$body .= "\n\n" . __( 'If you experience any issues or need support, the volunteers in the WordPress.org support forums may be able to help.' );
			$body .= "\n" . __( 'https://sitepad.com/support/' );
		}

		// Updates are important!
		if ( $type != 'success' || $newer_version_available ) {
			$body .= "\n\n" . __( 'Keeping your site updated is important for security. It also makes the internet a safer place for you and your readers.' );
		}

		if ( $critical_support ) {
			$body .= ' ' . __( "If you reach out to us, we'll also ensure you'll never have this problem again." );
		}

		// If things are successful and we're now on the latest, mention plugins and themes if any are out of date.
		if ( $type == 'success' && ! $newer_version_available && ( get_plugin_updates() || get_theme_updates() ) ) {
			$body .= "\n\n" . __( 'You also have some plugins or themes with updates available. Update them now:' );
			$body .= "\n" . network_admin_url();
		}

		$body .= "\n\n" . __( 'The WordPress Team' ) . "\n";

		if ( 'critical' == $type && is_wp_error( $result ) ) {
			$body .= "\n***\n\n";
			/* translators: %s: WordPress version */
			$body .= sprintf( __( 'Your site was running version %s.' ), get_bloginfo( 'version' ) );
			$body .= ' ' . __( 'We have some data that describes the error your site encountered.' );
			$body .= ' ' . __( 'Your hosting company, support forum volunteers, or a friendly developer may be able to use this information to help you:' );

			// If we had a rollback and we're still critical, then the rollback failed too.
			// Loop through all errors (the main WP_Error, the update result, the rollback result) for code, data, etc.
			if ( 'rollback_was_required' == $result->get_error_code() ) {
				$errors = array( $result, $result->get_error_data()->update, $result->get_error_data()->rollback );
			} else {
				$errors = array( $result );
			}

			foreach ( $errors as $error ) {
				if ( ! is_wp_error( $error ) ) {
					continue;
				}
				$error_code = $error->get_error_code();
				/* translators: %s: Error code */
				$body .= "\n\n" . sprintf( __( 'Error code: %s' ), $error_code );
				if ( 'rollback_was_required' == $error_code ) {
					continue;
				}
				if ( $error->get_error_message() ) {
					$body .= "\n" . $error->get_error_message();
				}
				$error_data = $error->get_error_data();
				if ( $error_data ) {
					$body .= "\n" . implode( ', ', (array) $error_data );
				}
			}
			$body .= "\n";
		}

		$to      = get_site_option( 'admin_email' );
		$headers = '';

		$email = compact( 'to', 'subject', 'body', 'headers' );

		/**
		 * Filters the email sent following an automatic background core update.
		 *
		 * @since 3.7.0
		 *
		 * @param array $email {
		 *     Array of email arguments that will be passed to wp_mail().
		 *
		 *     @type string $to      The email recipient. An array of emails
		 *                            can be returned, as handled by wp_mail().
		 *     @type string $subject The email's subject.
		 *     @type string $body    The email message body.
		 *     @type string $headers Any email headers, defaults to no headers.
		 * }
		 * @param string $type        The type of email being sent. Can be one of
		 *                            'success', 'fail', 'manual', 'critical'.
		 * @param object $core_update The update offer that was attempted.
		 * @param mixed  $result      The result for the core update. Can be WP_Error.
		 */
		$email = apply_filters( 'auto_core_update_email', $email, $type, $core_update, $result );

		wp_mail( $email['to'], wp_specialchars_decode( $email['subject'] ), $email['body'], $email['headers'] );
	}

	/**
	 * Prepares and sends an email of a full log of background update results, useful for debugging and geekery.
	 *
	 * @since 3.7.0
	 */
	protected function send_debug_email() {
		$update_count = 0;
		foreach ( $this->update_results as $type => $updates ) {
			$update_count += count( $updates );
		}

		$body     = array();
		$failures = 0;

		/* translators: %s: Network home URL */
		$body[] = sprintf( __( 'WordPress site: %s' ), network_home_url( '/' ) );

		// Core
		if ( isset( $this->update_results['core'] ) ) {
			$result = $this->update_results['core'][0];
			if ( $result->result && ! is_wp_error( $result->result ) ) {
				/* translators: %s: WordPress core version */
				$body[] = sprintf( __( 'SUCCESS: WordPress was successfully updated to %s' ), $result->name );
			} else {
				/* translators: %s: WordPress core version */
				$body[] = sprintf( __( 'FAILED: WordPress failed to update to %s' ), $result->name );
				$failures++;
			}
			$body[] = '';
		}

		// Plugins, Themes, Translations
		foreach ( array( 'plugin', 'theme', 'translation' ) as $type ) {
			if ( ! isset( $this->update_results[ $type ] ) ) {
				continue;
			}
			$success_items = wp_list_filter( $this->update_results[ $type ], array( 'result' => true ) );
			if ( $success_items ) {
				$messages = array(
					'plugin'      => __( 'The following plugins were successfully updated:' ),
					'theme'       => __( 'The following themes were successfully updated:' ),
					'translation' => __( 'The following translations were successfully updated:' ),
				);

				$body[] = $messages[ $type ];
				foreach ( wp_list_pluck( $success_items, 'name' ) as $name ) {
					/* translators: %s: name of plugin / theme / translations */
					$body[] = ' * ' . sprintf( __( 'SUCCESS: %s' ), $name );
				}
			}
			if ( $success_items != $this->update_results[ $type ] ) {
				// Failed updates
				$messages = array(
					'plugin'      => __( 'The following plugins failed to update:' ),
					'theme'       => __( 'The following themes failed to update:' ),
					'translation' => __( 'The following translations failed to update:' ),
				);

				$body[] = $messages[ $type ];
				foreach ( $this->update_results[ $type ] as $item ) {
					if ( ! $item->result || is_wp_error( $item->result ) ) {
						/* translators: %s: name of plugin / theme / translations */
						$body[] = ' * ' . sprintf( __( 'FAILED: %s' ), $item->name );
						$failures++;
					}
				}
			}
			$body[] = '';
		}

		$site_title = wp_specialchars_decode( get_bloginfo( 'name' ), ENT_QUOTES );
		if ( $failures ) {
			$body[] = trim(
				__(
					"BETA TESTING?
=============

This debugging email is sent when you are using a development version of WordPress.

If you think these failures might be due to a bug in WordPress, could you report it?
 * Open a thread in the support forums: https://sitepad.com/support/forum/alphabeta
 * Or, if you're comfortable writing a bug report: https://core.trac.wordpress.org/

Thanks! -- The WordPress Team"
				)
			);
			$body[] = '';

			/* translators: %s: site title */
			$subject = sprintf( __( '[%s] There were failures during background updates' ), $site_title );
		} else {
			/* translators: %s: site title */
			$subject = sprintf( __( '[%s] Background updates have finished' ), $site_title );
		}

		$body[] = trim(
			__(
				'UPDATE LOG
=========='
			)
		);
		$body[] = '';

		foreach ( array( 'core', 'plugin', 'theme', 'translation' ) as $type ) {
			if ( ! isset( $this->update_results[ $type ] ) ) {
				continue;
			}
			foreach ( $this->update_results[ $type ] as $update ) {
				$body[] = $update->name;
				$body[] = str_repeat( '-', strlen( $update->name ) );
				foreach ( $update->messages as $message ) {
					$body[] = '  ' . html_entity_decode( str_replace( '&#8230;', '...', $message ) );
				}
				if ( is_wp_error( $update->result ) ) {
					$results = array( 'update' => $update->result );
					// If we rolled back, we want to know an error that occurred then too.
					if ( 'rollback_was_required' === $update->result->get_error_code() ) {
						$results = (array) $update->result->get_error_data();
					}
					foreach ( $results as $result_type => $result ) {
						if ( ! is_wp_error( $result ) ) {
							continue;
						}

						if ( 'rollback' === $result_type ) {
							/* translators: 1: Error code, 2: Error message. */
							$body[] = '  ' . sprintf( __( 'Rollback Error: [%1$s] %2$s' ), $result->get_error_code(), $result->get_error_message() );
						} else {
							/* translators: 1: Error code, 2: Error message. */
							$body[] = '  ' . sprintf( __( 'Error: [%1$s] %2$s' ), $result->get_error_code(), $result->get_error_message() );
						}

						if ( $result->get_error_data() ) {
							$body[] = '         ' . implode( ', ', (array) $result->get_error_data() );
						}
					}
				}
				$body[] = '';
			}
		}

		$email = array(
			'to'      => get_site_option( 'admin_email' ),
			'subject' => $subject,
			'body'    => implode( "\n", $body ),
			'headers' => '',
		);

		/**
		 * Filters the debug email that can be sent following an automatic
		 * background core update.
		 *
		 * @since 3.8.0
		 *
		 * @param array $email {
		 *     Array of email arguments that will be passed to wp_mail().
		 *
		 *     @type string $to      The email recipient. An array of emails
		 *                           can be returned, as handled by wp_mail().
		 *     @type string $subject Email subject.
		 *     @type string $body    Email message body.
		 *     @type string $headers Any email headers. Default empty.
		 * }
		 * @param int   $failures The number of failures encountered while upgrading.
		 * @param mixed $results  The results of all attempted updates.
		 */
		$email = apply_filters( 'automatic_updates_debug_email', $email, $failures, $this->update_results );

		wp_mail( $email['to'], wp_specialchars_decode( $email['subject'] ), $email['body'], $email['headers'] );
	}
}

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