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<?php
/**
 * Upgrade API: WP_Upgrader class
 *
 * Requires skin classes and WP_Upgrader subclasses for backward compatibility.
 *
 * @package WordPress
 * @subpackage Upgrader
 * @since 2.8.0
 */

/** WP_Upgrader_Skin class */
require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader-skin.php';

/** Plugin_Upgrader_Skin class */
require_once ABSPATH . 'wp-admin/includes/class-plugin-upgrader-skin.php';

/** Theme_Upgrader_Skin class */
require_once ABSPATH . 'wp-admin/includes/class-theme-upgrader-skin.php';

/** Bulk_Upgrader_Skin class */
require_once ABSPATH . 'wp-admin/includes/class-bulk-upgrader-skin.php';

/** Bulk_Plugin_Upgrader_Skin class */
require_once ABSPATH . 'wp-admin/includes/class-bulk-plugin-upgrader-skin.php';

/** Bulk_Theme_Upgrader_Skin class */
require_once ABSPATH . 'wp-admin/includes/class-bulk-theme-upgrader-skin.php';

/** Plugin_Installer_Skin class */
require_once ABSPATH . 'wp-admin/includes/class-plugin-installer-skin.php';

/** Theme_Installer_Skin class */
require_once ABSPATH . 'wp-admin/includes/class-theme-installer-skin.php';

/** Language_Pack_Upgrader_Skin class */
require_once ABSPATH . 'wp-admin/includes/class-language-pack-upgrader-skin.php';

/** Automatic_Upgrader_Skin class */
require_once ABSPATH . 'wp-admin/includes/class-automatic-upgrader-skin.php';

/** WP_Ajax_Upgrader_Skin class */
require_once ABSPATH . 'wp-admin/includes/class-wp-ajax-upgrader-skin.php';

/**
 * Core class used for upgrading/installing a local set of files via
 * the Filesystem Abstraction classes from a Zip file.
 *
 * @since 2.8.0
 */
class WP_Upgrader {

/**
	 * The error/notification strings used to update the user on the progress.
	 *
	 * @since 2.8.0
	 * @var array $strings
	 */
	public $strings = array();

/**
	 * The upgrader skin being used.
	 *
	 * @since 2.8.0
	 * @var Automatic_Upgrader_Skin|WP_Upgrader_Skin $skin
	 */
	public $skin = null;

/**
	 * The result of the installation.
	 *
	 * This is set by WP_Upgrader::install_package(), only when the package is installed
	 * successfully. It will then be an array, unless a WP_Error is returned by the
	 * {@see 'upgrader_post_install'} filter. In that case, the WP_Error will be assigned to
	 * it.
	 *
	 * @since 2.8.0
	 *
	 * @var WP_Error|array $result {
	 *      @type string $source             The full path to the source the files were installed from.
	 *      @type string $source_files       List of all the files in the source directory.
	 *      @type string $destination        The full path to the installation destination folder.
	 *      @type string $destination_name   The name of the destination folder, or empty if `$destination`
	 *                                       and `$local_destination` are the same.
	 *      @type string $local_destination  The full local path to the destination folder. This is usually
	 *                                       the same as `$destination`.
	 *      @type string $remote_destination The full remote path to the destination folder
	 *                                       (i.e., from `$wp_filesystem`).
	 *      @type bool   $clear_destination  Whether the destination folder was cleared.
	 * }
	 */
	public $result = array();

/**
	 * The total number of updates being performed.
	 *
	 * Set by the bulk update methods.
	 *
	 * @since 3.0.0
	 * @var int $update_count
	 */
	public $update_count = 0;

/**
	 * The current update if multiple updates are being performed.
	 *
	 * Used by the bulk update methods, and incremented for each update.
	 *
	 * @since 3.0.0
	 * @var int
	 */
	public $update_current = 0;

/**
	 * Construct the upgrader with a skin.
	 *
	 * @since 2.8.0
	 *
	 * @param WP_Upgrader_Skin $skin The upgrader skin to use. Default is a WP_Upgrader_Skin.
	 *                               instance.
	 */
	public function __construct( $skin = null ) {
		if ( null == $skin )
			$this->skin = new WP_Upgrader_Skin();
		else
			$this->skin = $skin;
	}

/**
	 * Initialize the upgrader.
	 *
	 * This will set the relationship between the skin being used and this upgrader,
	 * and also add the generic strings to `WP_Upgrader::$strings`.
	 *
	 * @since 2.8.0
	 */
	public function init() {
		$this->skin->set_upgrader($this);
		$this->generic_strings();
	}

/**
	 * Add the generic strings to WP_Upgrader::$strings.
	 *
	 * @since 2.8.0
	 */
	public function generic_strings() {
		$this->strings['bad_request'] = __('Invalid data provided.');
		$this->strings['fs_unavailable'] = __('Could not access filesystem.');
		$this->strings['fs_error'] = __('Filesystem error.');
		$this->strings['fs_no_root_dir'] = __('Unable to locate WordPress root directory.');
		$this->strings['fs_no_content_dir'] = __('Unable to locate WordPress content directory (wp-content).');
		$this->strings['fs_no_plugins_dir'] = __('Unable to locate WordPress plugin directory.');
		$this->strings['fs_no_themes_dir'] = __('Unable to locate WordPress theme directory.');
		/* translators: %s: directory name */
		$this->strings['fs_no_folder'] = __('Unable to locate needed folder (%s).');

$this->strings['download_failed'] = __('Download failed.');
		$this->strings['installing_package'] = __('Installing the latest version&#8230;');
		$this->strings['no_files'] = __('The package contains no files.');
		$this->strings['folder_exists'] = __('Destination folder already exists.');
		$this->strings['mkdir_failed'] = __('Could not create directory.');
		$this->strings['incompatible_archive'] = __('The package could not be installed.');
		$this->strings['files_not_writable'] = __( 'The update cannot be installed because we will be unable to copy some files. This is usually due to inconsistent file permissions.' );

$this->strings['maintenance_start'] = __('Enabling Maintenance mode&#8230;');
		$this->strings['maintenance_end'] = __('Disabling Maintenance mode&#8230;');
	}

/**
	 * Connect to the filesystem.
	 *
	 * @since 2.8.0
	 *
	 * @global WP_Filesystem_Base $wp_filesystem Subclass
	 *
	 * @param array $directories                  Optional. A list of directories. If any of these do
	 *                                            not exist, a WP_Error object will be returned.
	 *                                            Default empty array.
	 * @param bool  $allow_relaxed_file_ownership Whether to allow relaxed file ownership.
	 *                                            Default false.
	 * @return bool|WP_Error True if able to connect, false or a WP_Error otherwise.
	 */
	public function fs_connect( $directories = array(), $allow_relaxed_file_ownership = false ) {
		global $wp_filesystem;

if ( false === ( $credentials = $this->skin->request_filesystem_credentials( false, $directories[0], $allow_relaxed_file_ownership ) ) ) {
			return false;
		}

if ( ! WP_Filesystem( $credentials, $directories[0], $allow_relaxed_file_ownership ) ) {
			$error = true;
			if ( is_object($wp_filesystem) && $wp_filesystem->errors->get_error_code() )
				$error = $wp_filesystem->errors;
			// Failed to connect, Error and request again
			$this->skin->request_filesystem_credentials( $error, $directories[0], $allow_relaxed_file_ownership );
			return false;
		}

if ( ! is_object($wp_filesystem) )
			return new WP_Error('fs_unavailable', $this->strings['fs_unavailable'] );

if ( is_wp_error($wp_filesystem->errors) && $wp_filesystem->errors->get_error_code() )
			return new WP_Error('fs_error', $this->strings['fs_error'], $wp_filesystem->errors);

foreach ( (array)$directories as $dir ) {
			switch ( $dir ) {
				case ABSPATH:
					if ( ! $wp_filesystem->abspath() )
						return new WP_Error('fs_no_root_dir', $this->strings['fs_no_root_dir']);
					break;
				case WP_CONTENT_DIR:
					if ( ! $wp_filesystem->wp_content_dir() )
						return new WP_Error('fs_no_content_dir', $this->strings['fs_no_content_dir']);
					break;
				case WP_PLUGIN_DIR:
					if ( ! $wp_filesystem->wp_plugins_dir() )
						return new WP_Error('fs_no_plugins_dir', $this->strings['fs_no_plugins_dir']);
					break;
				case get_theme_root():
					if ( ! $wp_filesystem->wp_themes_dir() )
						return new WP_Error('fs_no_themes_dir', $this->strings['fs_no_themes_dir']);
					break;
				default:
					if ( ! $wp_filesystem->find_folder($dir) )
						return new WP_Error( 'fs_no_folder', sprintf( $this->strings['fs_no_folder'], esc_html( basename( $dir ) ) ) );
					break;
			}
		}
		return true;
	} //end fs_connect();

/**
	 * Download a package.
	 *
	 * @since 2.8.0
	 *
	 * @param string $package The URI of the package. If this is the full path to an
	 *                        existing local file, it will be returned untouched.
	 * @return string|WP_Error The full path to the downloaded package file, or a WP_Error object.
	 */
	public function download_package( $package ) {

/**
		 * Filters whether to return the package.
		 *
		 * @since 3.7.0
		 *
		 * @param bool        $reply   Whether to bail without returning the package.
		 *                             Default false.
		 * @param string      $package The package file name.
		 * @param WP_Upgrader $this    The WP_Upgrader instance.
		 */
		$reply = apply_filters( 'upgrader_pre_download', false, $package, $this );
		if ( false !== $reply )
			return $reply;

if ( ! preg_match('!^(http|https|ftp)://!i', $package) && file_exists($package) ) //Local file or remote?
			return $package; //must be a local file..

if ( empty($package) )
			return new WP_Error('no_package', $this->strings['no_package']);

$this->skin->feedback('downloading_package', $package);

$download_file = download_url($package);

if ( is_wp_error($download_file) )
			return new WP_Error('download_failed', $this->strings['download_failed'], $download_file->get_error_message());

return $download_file;
	}

/**
	 * Unpack a compressed package file.
	 *
	 * @since 2.8.0
	 *
	 * @global WP_Filesystem_Base $wp_filesystem Subclass
	 *
	 * @param string $package        Full path to the package file.
	 * @param bool   $delete_package Optional. Whether to delete the package file after attempting
	 *                               to unpack it. Default true.
	 * @return string|WP_Error The path to the unpacked contents, or a WP_Error on failure.
	 */
	public function unpack_package( $package, $delete_package = true ) {
		global $wp_filesystem;

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

$upgrade_folder = $wp_filesystem->wp_content_dir() . 'upgrade/';

//Clean up contents of upgrade directory beforehand.
		$upgrade_files = $wp_filesystem->dirlist($upgrade_folder);
		if ( !empty($upgrade_files) ) {
			foreach ( $upgrade_files as $file )
				$wp_filesystem->delete($upgrade_folder . $file['name'], true);
		}

// We need a working directory - Strip off any .tmp or .zip suffixes
		$working_dir = $upgrade_folder . basename( basename( $package, '.tmp' ), '.zip' );

// Clean up working directory
		if ( $wp_filesystem->is_dir($working_dir) )
			$wp_filesystem->delete($working_dir, true);

// Unzip package to working directory
		$result = unzip_file( $package, $working_dir );

// Once extracted, delete the package if required.
		if ( $delete_package )
			unlink($package);

if ( is_wp_error($result) ) {
			$wp_filesystem->delete($working_dir, true);
			if ( 'incompatible_archive' == $result->get_error_code() ) {
				return new WP_Error( 'incompatible_archive', $this->strings['incompatible_archive'], $result->get_error_data() );
			}
			return $result;
		}

return $working_dir;
	}

/**
	 * Flatten the results of WP_Filesystem::dirlist() for iterating over.
	 *
	 * @since 4.9.0
	 * @access protected
	 *
	 * @param  array  $nested_files  Array of files as returned by WP_Filesystem::dirlist()
	 * @param  string $path          Relative path to prepend to child nodes. Optional.
	 * @return array $files A flattened array of the $nested_files specified.
	 */
	protected function flatten_dirlist( $nested_files, $path = '' ) {
		$files = array();

foreach ( $nested_files as $name => $details ) {
			$files[ $path . $name ] = $details;

// Append children recursively
			if ( ! empty( $details['files'] ) ) {
				$children = $this->flatten_dirlist( $details['files'], $path . $name . '/' );

// Merge keeping possible numeric keys, which array_merge() will reindex from 0..n
				$files = $files + $children;
			}
		}

return $files;
	}

/**
	 * Clears the directory where this item is going to be installed into.
	 *
	 * @since 4.3.0
	 *
	 * @global WP_Filesystem_Base $wp_filesystem Subclass
	 *
	 * @param string $remote_destination The location on the remote filesystem to be cleared
	 * @return bool|WP_Error True upon success, WP_Error on failure.
	 */
	public function clear_destination( $remote_destination ) {
		global $wp_filesystem;

$files = $wp_filesystem->dirlist( $remote_destination, true, true );

// False indicates that the $remote_destination doesn't exist.
		if ( false === $files ) {
			return true;
		}

// Flatten the file list to iterate over
		$files = $this->flatten_dirlist( $files );

// Check all files are writable before attempting to clear the destination.
		$unwritable_files = array();

// Check writability.
		foreach ( $files as $filename => $file_details ) {
			if ( ! $wp_filesystem->is_writable( $remote_destination . $filename ) ) {
				// Attempt to alter permissions to allow writes and try again.
				$wp_filesystem->chmod( $remote_destination . $filename, ( 'd' == $file_details['type'] ? FS_CHMOD_DIR : FS_CHMOD_FILE ) );
				if ( ! $wp_filesystem->is_writable( $remote_destination . $filename ) ) {
					$unwritable_files[] = $filename;
				}
			}
		}

if ( ! empty( $unwritable_files ) ) {
			return new WP_Error( 'files_not_writable', $this->strings['files_not_writable'], implode( ', ', $unwritable_files ) );
		}

if ( ! $wp_filesystem->delete( $remote_destination, true ) ) {
			return new WP_Error( 'remove_old_failed', $this->strings['remove_old_failed'] );
		}

return true;
	}

/**
	 * Install a package.
	 *
	 * Copies the contents of a package form a source directory, and installs them in
	 * a destination directory. Optionally removes the source. It can also optionally
	 * clear out the destination folder if it already exists.
	 *
	 * @since 2.8.0
	 *
	 * @global WP_Filesystem_Base $wp_filesystem Subclass
	 * @global array              $wp_theme_directories
	 *
	 * @param array|string $args {
	 *     Optional. Array or string of arguments for installing a package. Default empty array.
	 *
	 *     @type string $source                      Required path to the package source. Default empty.
	 *     @type string $destination                 Required path to a folder to install the package in.
	 *                                               Default empty.
	 *     @type bool   $clear_destination           Whether to delete any files already in the destination
	 *                                               folder. Default false.
	 *     @type bool   $clear_working               Whether to delete the files form the working directory
	 *                                               after copying to the destination. Default false.
	 *     @type bool   $abort_if_destination_exists Whether to abort the installation if
	 *                                               the destination folder already exists. Default true.
	 *     @type array  $hook_extra                  Extra arguments to pass to the filter hooks called by
	 *                                               WP_Upgrader::install_package(). Default empty array.
	 * }
	 *
	 * @return array|WP_Error The result (also stored in `WP_Upgrader::$result`), or a WP_Error on failure.
	 */
	public function install_package( $args = array() ) {
		global $wp_filesystem, $wp_theme_directories;

$defaults = array(
			'source' => '', // Please always pass this
			'destination' => '', // and this
			'clear_destination' => false,
			'clear_working' => false,
			'abort_if_destination_exists' => true,
			'hook_extra' => array()
		);

$args = wp_parse_args($args, $defaults);

// These were previously extract()'d.
		$source = $args['source'];
		$destination = $args['destination'];
		$clear_destination = $args['clear_destination'];

@set_time_limit( 300 );

if ( empty( $source ) || empty( $destination ) ) {
			return new WP_Error( 'bad_request', $this->strings['bad_request'] );
		}
		$this->skin->feedback( 'installing_package' );

/**
		 * Filters the install response before the installation has started.
		 *
		 * Returning a truthy value, or one that could be evaluated as a WP_Error
		 * will effectively short-circuit the installation, returning that value
		 * instead.
		 *
		 * @since 2.8.0
		 *
		 * @param bool|WP_Error $response   Response.
		 * @param array         $hook_extra Extra arguments passed to hooked filters.
		 */
		$res = apply_filters( 'upgrader_pre_install', true, $args['hook_extra'] );

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

//Retain the Original source and destinations
		$remote_source = $args['source'];
		$local_destination = $destination;

$source_files = array_keys( $wp_filesystem->dirlist( $remote_source ) );
		$remote_destination = $wp_filesystem->find_folder( $local_destination );

//Locate which directory to copy to the new folder, This is based on the actual folder holding the files.
		if ( 1 == count( $source_files ) && $wp_filesystem->is_dir( trailingslashit( $args['source'] ) . $source_files[0] . '/' ) ) { //Only one folder? Then we want its contents.
			$source = trailingslashit( $args['source'] ) . trailingslashit( $source_files[0] );
		} elseif ( count( $source_files ) == 0 ) {
			return new WP_Error( 'incompatible_archive_empty', $this->strings['incompatible_archive'], $this->strings['no_files'] ); // There are no files?
		} else { // It's only a single file, the upgrader will use the folder name of this file as the destination folder. Folder name is based on zip filename.
			$source = trailingslashit( $args['source'] );
		}

/**
		 * Filters the source file location for the upgrade package.
		 *
		 * @since 2.8.0
		 * @since 4.4.0 The $hook_extra parameter became available.
		 *
		 * @param string      $source        File source location.
		 * @param string      $remote_source Remote file source location.
		 * @param WP_Upgrader $this          WP_Upgrader instance.
		 * @param array       $hook_extra    Extra arguments passed to hooked filters.
		 */
		$source = apply_filters( 'upgrader_source_selection', $source, $remote_source, $this, $args['hook_extra'] );

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

// Has the source location changed? If so, we need a new source_files list.
		if ( $source !== $remote_source ) {
			$source_files = array_keys( $wp_filesystem->dirlist( $source ) );
		}

/*
		 * Protection against deleting files in any important base directories.
		 * Theme_Upgrader & Plugin_Upgrader also trigger this, as they pass the
		 * destination directory (WP_PLUGIN_DIR / wp-content/themes) intending
		 * to copy the directory into the directory, whilst they pass the source
		 * as the actual files to copy.
		 */
		$protected_directories = array( ABSPATH, WP_CONTENT_DIR, WP_PLUGIN_DIR, WP_CONTENT_DIR . '/themes' );

if ( is_array( $wp_theme_directories ) ) {
			$protected_directories = array_merge( $protected_directories, $wp_theme_directories );
		}

if ( in_array( $destination, $protected_directories ) ) {
			$remote_destination = trailingslashit( $remote_destination ) . trailingslashit( basename( $source ) );
			$destination = trailingslashit( $destination ) . trailingslashit( basename( $source ) );
		}

if ( $clear_destination ) {
			// We're going to clear the destination if there's something there.
			$this->skin->feedback('remove_old');

$removed = $this->clear_destination( $remote_destination );

/**
			 * Filters whether the upgrader cleared the destination.
			 *
			 * @since 2.8.0
			 *
			 * @param mixed  $removed            Whether the destination was cleared. true on success, WP_Error on failure
			 * @param string $local_destination  The local package destination.
			 * @param string $remote_destination The remote package destination.
			 * @param array  $hook_extra         Extra arguments passed to hooked filters.
			 */
			$removed = apply_filters( 'upgrader_clear_destination', $removed, $local_destination, $remote_destination, $args['hook_extra'] );

if ( is_wp_error( $removed ) ) {
				return $removed;
			}
		} elseif ( $args['abort_if_destination_exists'] && $wp_filesystem->exists($remote_destination) ) {
			//If we're not clearing the destination folder and something exists there already, Bail.
			//But first check to see if there are actually any files in the folder.
			$_files = $wp_filesystem->dirlist($remote_destination);
			if ( ! empty($_files) ) {
				$wp_filesystem->delete($remote_source, true); //Clear out the source files.
				return new WP_Error('folder_exists', $this->strings['folder_exists'], $remote_destination );
			}
		}

//Create destination if needed
		if ( ! $wp_filesystem->exists( $remote_destination ) ) {
			if ( ! $wp_filesystem->mkdir( $remote_destination, FS_CHMOD_DIR ) ) {
				return new WP_Error( 'mkdir_failed_destination', $this->strings['mkdir_failed'], $remote_destination );
			}
		}
		// Copy new version of item into place.
		$result = copy_dir($source, $remote_destination);
		if ( is_wp_error($result) ) {
			if ( $args['clear_working'] ) {
				$wp_filesystem->delete( $remote_source, true );
			}
			return $result;
		}

//Clear the Working folder?
		if ( $args['clear_working'] ) {
			$wp_filesystem->delete( $remote_source, true );
		}

$destination_name = basename( str_replace($local_destination, '', $destination) );
		if ( '.' == $destination_name ) {
			$destination_name = '';
		}

$this->result = compact( 'source', 'source_files', 'destination', 'destination_name', 'local_destination', 'remote_destination', 'clear_destination' );

/**
		 * Filters the installation response after the installation has finished.
		 *
		 * @since 2.8.0
		 *
		 * @param bool  $response   Installation response.
		 * @param array $hook_extra Extra arguments passed to hooked filters.
		 * @param array $result     Installation result data.
		 */
		$res = apply_filters( 'upgrader_post_install', true, $args['hook_extra'], $this->result );

if ( is_wp_error($res) ) {
			$this->result = $res;
			return $res;
		}

//Bombard the calling function will all the info which we've just used.
		return $this->result;
	}

/**
	 * Run an upgrade/installation.
	 *
	 * Attempts to download the package (if it is not a local file), unpack it, and
	 * install it in the destination folder.
	 *
	 * @since 2.8.0
	 *
	 * @param array $options {
	 *     Array or string of arguments for upgrading/installing a package.
	 *
	 *     @type string $package                     The full path or URI of the package to install.
	 *                                               Default empty.
	 *     @type string $destination                 The full path to the destination folder.
	 *                                               Default empty.
	 *     @type bool   $clear_destination           Whether to delete any files already in the
	 *                                               destination folder. Default false.
	 *     @type bool   $clear_working               Whether to delete the files form the working
	 *                                               directory after copying to the destination.
	 *                                               Default false.
	 *     @type bool   $abort_if_destination_exists Whether to abort the installation if the destination
	 *                                               folder already exists. When true, `$clear_destination`
	 *                                               should be false. Default true.
	 *     @type bool   $is_multi                    Whether this run is one of multiple upgrade/installation
	 *                                               actions being performed in bulk. When true, the skin
	 *                                               WP_Upgrader::header() and WP_Upgrader::footer()
	 *                                               aren't called. Default false.
	 *     @type array  $hook_extra                  Extra arguments to pass to the filter hooks called by
	 *                                               WP_Upgrader::run().
	 * }
	 * @return array|false|WP_error The result from self::install_package() on success, otherwise a WP_Error,
	 *                              or false if unable to connect to the filesystem.
	 */
	public function run( $options ) {

$defaults = array(
			'package' => '', // Please always pass this.
			'destination' => '', // And this
			'clear_destination' => false,
			'abort_if_destination_exists' => true, // Abort if the Destination directory exists, Pass clear_destination as false please
			'clear_working' => true,
			'is_multi' => false,
			'hook_extra' => array() // Pass any extra $hook_extra args here, this will be passed to any hooked filters.
		);

$options = wp_parse_args( $options, $defaults );

/**
		 * Filters the package options before running an update.
		 *
		 * See also {@see 'upgrader_process_complete'}.
		 *
		 * @since 4.3.0
		 *
		 * @param array $options {
		 *     Options used by the upgrader.
		 *
		 *     @type string $package                     Package for update.
		 *     @type string $destination                 Update location.
		 *     @type bool   $clear_destination           Clear the destination resource.
		 *     @type bool   $clear_working               Clear the working resource.
		 *     @type bool   $abort_if_destination_exists Abort if the Destination directory exists.
		 *     @type bool   $is_multi                    Whether the upgrader is running multiple times.
		 *     @type array  $hook_extra {
		 *         Extra hook arguments.
		 *
		 *         @type string $action               Type of action. Default 'update'.
		 *         @type string $type                 Type of update process. Accepts 'plugin', 'theme', or 'core'.
		 *         @type bool   $bulk                 Whether the update process is a bulk update. Default true.
		 *         @type string $plugin               The base plugin path from the plugins directory.
		 *         @type string $theme                The stylesheet or template name of the theme.
		 *         @type string $language_update_type The language pack update type. Accepts 'plugin', 'theme',
		 *                                            or 'core'.
		 *         @type object $language_update      The language pack update offer.
		 *     }
		 * }
		 */
		$options = apply_filters( 'upgrader_package_options', $options );

if ( ! $options['is_multi'] ) { // call $this->header separately if running multiple times
			$this->skin->header();
		}

// Connect to the Filesystem first.
		$res = $this->fs_connect( array( WP_CONTENT_DIR, $options['destination'] ) );
		// Mainly for non-connected filesystem.
		if ( ! $res ) {
			if ( ! $options['is_multi'] ) {
				$this->skin->footer();
			}
			return false;
		}

$this->skin->before();

if ( is_wp_error($res) ) {
			$this->skin->error($res);
			$this->skin->after();
			if ( ! $options['is_multi'] ) {
				$this->skin->footer();
			}
			return $res;
		}

/*
		 * Download the package (Note, This just returns the filename
		 * of the file if the package is a local file)
		 */
		$download = $this->download_package( $options['package'] );
		if ( is_wp_error($download) ) {
			$this->skin->error($download);
			$this->skin->after();
			if ( ! $options['is_multi'] ) {
				$this->skin->footer();
			}
			return $download;
		}

$delete_package = ( $download != $options['package'] ); // Do not delete a "local" file

// Unzips the file into a temporary directory.
		$working_dir = $this->unpack_package( $download, $delete_package );
		if ( is_wp_error($working_dir) ) {
			$this->skin->error($working_dir);
			$this->skin->after();
			if ( ! $options['is_multi'] ) {
				$this->skin->footer();
			}
			return $working_dir;
		}

// With the given options, this installs it to the destination directory.
		$result = $this->install_package( array(
			'source' => $working_dir,
			'destination' => $options['destination'],
			'clear_destination' => $options['clear_destination'],
			'abort_if_destination_exists' => $options['abort_if_destination_exists'],
			'clear_working' => $options['clear_working'],
			'hook_extra' => $options['hook_extra']
		) );

$this->skin->set_result($result);
		if ( is_wp_error($result) ) {
			$this->skin->error($result);
			$this->skin->feedback('process_failed');
		} else {
			// Installation succeeded.
			$this->skin->feedback('process_success');
		}

$this->skin->after();

if ( ! $options['is_multi'] ) {

/**
			 * Fires when the upgrader process is complete.
			 *
			 * See also {@see 'upgrader_package_options'}.
			 *
			 * @since 3.6.0
			 * @since 3.7.0 Added to WP_Upgrader::run().
			 * @since 4.6.0 `$translations` was added as a possible argument to `$hook_extra`.
			 *
			 * @param WP_Upgrader $this WP_Upgrader instance. In other contexts, $this, might be a
			 *                          Theme_Upgrader, Plugin_Upgrader, Core_Upgrade, or Language_Pack_Upgrader instance.
			 * @param array       $hook_extra {
			 *     Array of bulk item update data.
			 *
			 *     @type string $action       Type of action. Default 'update'.
			 *     @type string $type         Type of update process. Accepts 'plugin', 'theme', 'translation', or 'core'.
			 *     @type bool   $bulk         Whether the update process is a bulk update. Default true.
			 *     @type array  $plugins      Array of the basename paths of the plugins' main files.
			 *     @type array  $themes       The theme slugs.
			 *     @type array  $translations {
			 *         Array of translations update data.
			 *
			 *         @type string $language The locale the translation is for.
			 *         @type string $type     Type of translation. Accepts 'plugin', 'theme', or 'core'.
			 *         @type string $slug     Text domain the translation is for. The slug of a theme/plugin or
			 *                                'default' for core translations.
			 *         @type string $version  The version of a theme, plugin, or core.
			 *     }
			 * }
			 */
			do_action( 'upgrader_process_complete', $this, $options['hook_extra'] );

$this->skin->footer();
		}

return $result;
	}

/**
	 * Toggle maintenance mode for the site.
	 *
	 * Creates/deletes the maintenance file to enable/disable maintenance mode.
	 *
	 * @since 2.8.0
	 *
	 * @global WP_Filesystem_Base $wp_filesystem Subclass
	 *
	 * @param bool $enable True to enable maintenance mode, false to disable.
	 */
	public function maintenance_mode( $enable = false ) {
		global $wp_filesystem;
		$file = $wp_filesystem->abspath() . '.maintenance';
		if ( $enable ) {
			$this->skin->feedback('maintenance_start');
			// Create maintenance file to signal that we are upgrading
			$maintenance_string = '<?php $upgrading = ' . time() . '; ?>';
			$wp_filesystem->delete($file);
			$wp_filesystem->put_contents($file, $maintenance_string, FS_CHMOD_FILE);
		} elseif ( ! $enable && $wp_filesystem->exists( $file ) ) {
			$this->skin->feedback('maintenance_end');
			$wp_filesystem->delete($file);
		}
	}

/**
 	 * Creates a lock using WordPress options.
 	 *
 	 * @since 4.5.0
 	 * @static
 	 *
 	 * @param string $lock_name       The name of this unique lock.
 	 * @param int    $release_timeout Optional. The duration in seconds to respect an existing lock.
	 *                                Default: 1 hour.
 	 * @return bool False if a lock couldn't be created or if the lock is still valid. True otherwise.
 	 */
	public static function create_lock( $lock_name, $release_timeout = null ) {
		global $wpdb;
		if ( ! $release_timeout ) {
			$release_timeout = HOUR_IN_SECONDS;
		}
		$lock_option = $lock_name . '.lock';

// Try to lock.
		$lock_result = $wpdb->query( $wpdb->prepare( "INSERT IGNORE INTO `$wpdb->options` ( `option_name`, `option_value`, `autoload` ) VALUES (%s, %s, 'no') /* LOCK */", $lock_option, time() ) );

if ( ! $lock_result ) {
			$lock_result = get_option( $lock_option );

// If a lock couldn't be created, and there isn't a lock, bail.
			if ( ! $lock_result ) {
				return false;
			}

// Check to see if the lock is still valid. If it is, bail.
			if ( $lock_result > ( time() - $release_timeout ) ) {
				return false;
			}

// There must exist an expired lock, clear it and re-gain it.
			WP_Upgrader::release_lock( $lock_name );

return WP_Upgrader::create_lock( $lock_name, $release_timeout );
		}

// Update the lock, as by this point we've definitely got a lock, just need to fire the actions.
		update_option( $lock_option, time() );

return true;
	}

/**
 	 * Releases an upgrader lock.
 	 *
 	 * @since 4.5.0
 	 * @static
	 *
	 * @see WP_Upgrader::create_lock()
 	 *
 	 * @param string $lock_name The name of this unique lock.
	 * @return bool True if the lock was successfully released. False on failure.
 	 */
	public static function release_lock( $lock_name ) {
		return delete_option( $lock_name . '.lock' );
	}

}

/** Plugin_Upgrader class */
require_once ABSPATH . 'wp-admin/includes/class-plugin-upgrader.php';

/** Theme_Upgrader class */
require_once ABSPATH . 'wp-admin/includes/class-theme-upgrader.php';

/** Language_Pack_Upgrader class */
require_once ABSPATH . 'wp-admin/includes/class-language-pack-upgrader.php';

/** Core_Upgrader class */
require_once ABSPATH . 'wp-admin/includes/class-core-upgrader.php';

/** File_Upload_Upgrader class */
require_once ABSPATH . 'wp-admin/includes/class-file-upload-upgrader.php';

/** WP_Automatic_Updater class */
require_once ABSPATH . 'wp-admin/includes/class-wp-automatic-updater.php';

Nama File / Folder	Size	Action
admin-filters.php	6.676KB	Edit File Delete File Rename
admin.php	2.879KB	Edit File Delete File Rename
ajax-actions.php	125.452KB	Edit File Delete File Rename
class-bulk-theme-upgrader-skin.php	1.895KB	Edit File Delete File Rename
class-bulk-upgrader-skin.php	5.078KB	Edit File Delete File Rename
class-file-upload-upgrader.php	3.181KB	Edit File Delete File Rename
class-ftp-pure.php	5.272KB	Edit File Delete File Rename
class-language-pack-upgrader-skin.php	2.133KB	Edit File Delete File Rename
class-language-pack-upgrader.php	10.806KB	Edit File Delete File Rename
class-pclzip.php	191.206KB	Edit File Delete File Rename
class-plugin-installer-skin.php	4.205KB	Edit File Delete File Rename
class-plugin-upgrader-skin.php	2.496KB	Edit File Delete File Rename
class-plugin-upgrader.php	14.319KB	Edit File Delete File Rename
class-theme-upgrader-skin.php	3.344KB	Edit File Delete File Rename
class-walker-category-checklist.php	4.115KB	Edit File Delete File Rename
class-walker-nav-menu-checklist.php	4.813KB	Edit File Delete File Rename
class-wp-comments-list-table.php	25.037KB	Edit File Delete File Rename
class-wp-filesystem-base.php	21.664KB	Edit File Delete File Rename
class-wp-filesystem-direct.php	10.959KB	Edit File Delete File Rename
class-wp-filesystem-ftpext.php	13.149KB	Edit File Delete File Rename
class-wp-filesystem-ftpsockets.php	10.338KB	Edit File Delete File Rename
class-wp-filesystem-ssh2.php	14.612KB	Edit File Delete File Rename
class-wp-importer.php	7.17KB	Edit File Delete File Rename
class-wp-internal-pointers.php	5.392KB	Edit File Delete File Rename
class-wp-links-list-table.php	7.424KB	Edit File Delete File Rename
class-wp-list-table-compat.php	1.043KB	Edit File Delete File Rename
class-wp-media-list-table.php	22.11KB	Edit File Delete File Rename
class-wp-ms-sites-list-table.php	15.191KB	Edit File Delete File Rename
class-wp-ms-themes-list-table.php	19.758KB	Edit File Delete File Rename
class-wp-ms-users-list-table.php	12.541KB	Edit File Delete File Rename
class-wp-plugin-install-list-table.php	18.895KB	Edit File Delete File Rename
class-wp-plugins-list-table.php	32.049KB	Edit File Delete File Rename
class-wp-post-comments-list-table.php	1.438KB	Edit File Delete File Rename
class-wp-posts-list-table.php	51.479KB	Edit File Delete File Rename
class-wp-screen.php	33.513KB	Edit File Delete File Rename
class-wp-site-icon.php	5.901KB	Edit File Delete File Rename
class-wp-terms-list-table.php	17.536KB	Edit File Delete File Rename
class-wp-theme-install-list-table.php	14.184KB	Edit File Delete File Rename
class-wp-themes-list-table.php	9.05KB	Edit File Delete File Rename
class-wp-upgrader-stat.php	0.367KB	Edit File Delete File Rename
class-wp-upgrader.php	33.118KB	Edit File Delete File Rename
class-wp-users-list-table.php	16.877KB	Edit File Delete File Rename
comment.php	5.592KB	Edit File Delete File Rename
continents-cities.php	19.042KB	Edit File Delete File Rename
edit-tag-messages.php	1.378KB	Edit File Delete File Rename
file.php	80.229KB	Edit File Delete File Rename
image-edit.php	32.767KB	Edit File Delete File Rename
image.php	21.579KB	Edit File Delete File Rename
import-queue.php	0.978KB	Edit File Delete File Rename
import.php	6.1KB	Edit File Delete File Rename
list-table.php	2.586KB	Edit File Delete File Rename
menu.php	8.511KB	Edit File Delete File Rename
misc.php	61.826KB	Edit File Delete File Rename
ms-admin-filters.php	1.354KB	Edit File Delete File Rename
ms-deprecated.php	2.793KB	Edit File Delete File Rename
ms.php	34.576KB	Edit File Delete File Rename
nav-menu.php	41.474KB	Edit File Delete File Rename
network.php	23.319KB	Edit File Delete File Rename
options.php	3.742KB	Edit File Delete File Rename
plugin-install.php	30.957KB	Edit File Delete File Rename
revision.php	14.597KB	Edit File Delete File Rename
screen.php	6.004KB	Edit File Delete File Rename
taxonomy.php	7.546KB	Edit File Delete File Rename
template.php	78.074KB	Edit File Delete File Rename
theme-install.php	6.139KB	Edit File Delete File Rename
theme.php	27.67KB	Edit File Delete File Rename
translation-install.php	8.351KB	Edit File Delete File Rename
update.php	25.267KB	Edit File Delete File Rename
user.php	48.255KB	Edit File Delete File Rename
widgets.php	9.767KB	Edit File Delete File Rename