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

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

/**
	 * Plugin upgrade result.
	 *
	 * @since 2.8.0
	 * @var array|WP_Error $result
	 *
	 * @see WP_Upgrader::$result
	 */
	public $result;

/**
	 * Whether a bulk upgrade/installation is being performed.
	 *
	 * @since 2.9.0
	 * @var bool $bulk
	 */
	public $bulk = false;

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

/**
	 * Initialize the installation strings.
	 *
	 * @since 2.8.0
	 */
	public function install_strings() {
		$this->strings['no_package'] = __('Installation package not available.');
		/* translators: %s: package URL */
		$this->strings['downloading_package'] = sprintf( __( 'Downloading installation package from %s&#8230;' ), '<span class="code">%s</span>' );
		$this->strings['unpack_package'] = __('Unpacking the package&#8230;');
		$this->strings['installing_package'] = __('Installing the plugin&#8230;');
		$this->strings['no_files'] = __('The plugin contains no files.');
		$this->strings['process_failed'] = __('Plugin installation failed.');
		$this->strings['process_success'] = __('Plugin installed successfully.');
	}

/**
	 * Install a plugin package.
	 *
	 * @since 2.8.0
	 * @since 3.7.0 The `$args` parameter was added, making clearing the plugin update cache optional.
	 *
	 * @param string $package The full local path or URI of the package.
	 * @param array  $args {
	 *     Optional. Other arguments for installing a plugin package. Default empty array.
	 *
	 *     @type bool $clear_update_cache Whether to clear the plugin updates cache if successful.
	 *                                    Default true.
	 * }
	 * @return bool|WP_Error True if the installation was successful, false or a WP_Error otherwise.
	 */
	public function install( $package, $args = array() ) {

$defaults = array(
			'clear_update_cache' => true,
		);
		$parsed_args = wp_parse_args( $args, $defaults );

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

add_filter('upgrader_source_selection', array($this, 'check_package') );
		if ( $parsed_args['clear_update_cache'] ) {
			// Clear cache so wp_update_plugins() knows about the new plugin.
			add_action( 'upgrader_process_complete', 'wp_clean_plugins_cache', 9, 0 );
		}

$this->run( array(
			'package' => $package,
			'destination' => WP_PLUGIN_DIR,
			'clear_destination' => false, // Do not overwrite files.
			'clear_working' => true,
			'hook_extra' => array(
				'type' => 'plugin',
				'action' => 'install',
			)
		) );

remove_action( 'upgrader_process_complete', 'wp_clean_plugins_cache', 9 );
		remove_filter('upgrader_source_selection', array($this, 'check_package') );

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

// Force refresh of plugin update information
		wp_clean_plugins_cache( $parsed_args['clear_update_cache'] );

return true;
	}

/**
	 * Upgrade a plugin.
	 *
	 * @since 2.8.0
	 * @since 3.7.0 The `$args` parameter was added, making clearing the plugin update cache optional.
	 *
	 * @param string $plugin The basename path to the main plugin file.
	 * @param array  $args {
	 *     Optional. Other arguments for upgrading a plugin package. Default empty array.
	 *
	 *     @type bool $clear_update_cache Whether to clear the plugin updates cache if successful.
	 *                                    Default true.
	 * }
	 * @return bool|WP_Error True if the upgrade was successful, false or a WP_Error object otherwise.
	 */
	public function upgrade( $plugin, $args = array() ) {

$defaults = array(
			'clear_update_cache' => true,
		);
		$parsed_args = wp_parse_args( $args, $defaults );

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

$current = get_site_transient( 'update_plugins' );
		if ( !isset( $current->response[ $plugin ] ) ) {
			$this->skin->before();
			$this->skin->set_result(false);
			$this->skin->error('up_to_date');
			$this->skin->after();
			return false;
		}

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

add_filter('upgrader_pre_install', array($this, 'deactivate_plugin_before_upgrade'), 10, 2);
		add_filter('upgrader_clear_destination', array($this, 'delete_old_plugin'), 10, 4);
		//'source_selection' => array($this, 'source_selection'), //there's a trac ticket to move up the directory for zip's which are made a bit differently, useful for non-.org plugins.
		if ( $parsed_args['clear_update_cache'] ) {
			// Clear cache so wp_update_plugins() knows about the new plugin.
			add_action( 'upgrader_process_complete', 'wp_clean_plugins_cache', 9, 0 );
		}

$this->run( array(
			'package' => $r->package,
			'destination' => WP_PLUGIN_DIR,
			'clear_destination' => true,
			'clear_working' => true,
			'hook_extra' => array(
				'plugin' => $plugin,
				'type' => 'plugin',
				'action' => 'update',
			),
		) );

// Cleanup our hooks, in case something else does a upgrade on this connection.
		remove_action( 'upgrader_process_complete', 'wp_clean_plugins_cache', 9 );
		remove_filter('upgrader_pre_install', array($this, 'deactivate_plugin_before_upgrade'));
		remove_filter('upgrader_clear_destination', array($this, 'delete_old_plugin'));

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

// Force refresh of plugin update information
		wp_clean_plugins_cache( $parsed_args['clear_update_cache'] );

return true;
	}

/**
	 * Bulk upgrade several plugins at once.
	 *
	 * @since 2.8.0
	 * @since 3.7.0 The `$args` parameter was added, making clearing the plugin update cache optional.
	 *
	 * @param array $plugins Array of the basename paths of the plugins' main files.
	 * @param array $args {
	 *     Optional. Other arguments for upgrading several plugins at once. Default empty array.
	 *
	 *     @type bool $clear_update_cache Whether to clear the plugin updates cache if successful.
	 *                                    Default true.
	 * }
	 * @return array|false An array of results indexed by plugin file, or false if unable to connect to the filesystem.
	 */
	public function bulk_upgrade( $plugins, $args = array() ) {

$defaults = array(
			'clear_update_cache' => true,
		);
		$parsed_args = wp_parse_args( $args, $defaults );

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

$current = get_site_transient( 'update_plugins' );

add_filter('upgrader_clear_destination', array($this, 'delete_old_plugin'), 10, 4);

$this->skin->header();

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

$this->skin->bulk_header();

/*
		 * Only start maintenance mode if:
		 * - running Multisite and there are one or more plugins specified, OR
		 * - a plugin with an update available is currently active.
		 * @TODO: For multisite, maintenance mode should only kick in for individual sites if at all possible.
		 */
		$maintenance = ( is_multisite() && ! empty( $plugins ) );
		foreach ( $plugins as $plugin )
			$maintenance = $maintenance || ( is_plugin_active( $plugin ) && isset( $current->response[ $plugin] ) );
		if ( $maintenance )
			$this->maintenance_mode(true);

$results = array();

$this->update_count = count($plugins);
		$this->update_current = 0;
		foreach ( $plugins as $plugin ) {
			$this->update_current++;
			$this->skin->plugin_info = get_plugin_data( WP_PLUGIN_DIR . '/' . $plugin, false, true);

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

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

$this->skin->plugin_active = is_plugin_active($plugin);

$result = $this->run( array(
				'package' => $r->package,
				'destination' => WP_PLUGIN_DIR,
				'clear_destination' => true,
				'clear_working' => true,
				'is_multi' => true,
				'hook_extra' => array(
					'plugin' => $plugin
				)
			) );

$results[$plugin] = $this->result;

// Prevent credentials auth screen from displaying multiple times
			if ( false === $result )
				break;
		} //end foreach $plugins

$this->maintenance_mode(false);

// Force refresh of plugin update information.
		wp_clean_plugins_cache( $parsed_args['clear_update_cache'] );

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

$this->skin->bulk_footer();

$this->skin->footer();

// Cleanup our hooks, in case something else does a upgrade on this connection.
		remove_filter('upgrader_clear_destination', array($this, 'delete_old_plugin'));

return $results;
	}

/**
	 * Check a source package to be sure it contains a plugin.
	 *
	 * This function is added to the {@see 'upgrader_source_selection'} filter by
	 * Plugin_Upgrader::install().
	 *
	 * @since 3.3.0
	 *
	 * @global WP_Filesystem_Base $wp_filesystem Subclass
	 *
	 * @param string $source The path to the downloaded package source.
	 * @return string|WP_Error The source as passed, or a WP_Error object
	 *                         if no plugins were found.
	 */
	public function check_package($source) {
		global $wp_filesystem;

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

$working_directory = str_replace( $wp_filesystem->wp_content_dir(), trailingslashit(WP_CONTENT_DIR), $source);
		if ( ! is_dir($working_directory) ) // Sanity check, if the above fails, let's not prevent installation.
			return $source;

// Check the folder contains at least 1 valid plugin.
		$plugins_found = false;
		$files = glob( $working_directory . '*.php' );
		if ( $files ) {
			foreach ( $files as $file ) {
				$info = get_plugin_data( $file, false, false );
				if ( ! empty( $info['Name'] ) ) {
					$plugins_found = true;
					break;
				}
			}
		}

if ( ! $plugins_found )
			return new WP_Error( 'incompatible_archive_no_plugins', $this->strings['incompatible_archive'], __( 'No valid plugins were found.' ) );

return $source;
	}

/**
	 * Retrieve the path to the file that contains the plugin info.
	 *
	 * This isn't used internally in the class, but is called by the skins.
	 *
	 * @since 2.8.0
	 *
	 * @return string|false The full path to the main plugin file, or false.
	 */
	public function plugin_info() {
		if ( ! is_array($this->result) )
			return false;
		if ( empty($this->result['destination_name']) )
			return false;

$plugin = get_plugins('/' . $this->result['destination_name']); //Ensure to pass with leading slash
		if ( empty($plugin) )
			return false;

$pluginfiles = array_keys($plugin); //Assume the requested plugin is the first in the list

return $this->result['destination_name'] . '/' . $pluginfiles[0];
	}

/**
	 * Deactivates a plugin before it is upgraded.
	 *
	 * Hooked to the {@see 'upgrader_pre_install'} filter by Plugin_Upgrader::upgrade().
	 *
	 * @since 2.8.0
	 * @since 4.1.0 Added a return value.
	 *
	 * @param bool|WP_Error  $return Upgrade offer return.
	 * @param array          $plugin Plugin package arguments.
	 * @return bool|WP_Error The passed in $return param or WP_Error.
	 */
	public function deactivate_plugin_before_upgrade($return, $plugin) {

if ( is_wp_error($return) ) //Bypass.
			return $return;

// When in cron (background updates) don't deactivate the plugin, as we require a browser to reactivate it
		if ( wp_doing_cron() )
			return $return;

$plugin = isset($plugin['plugin']) ? $plugin['plugin'] : '';
		if ( empty($plugin) )
			return new WP_Error('bad_request', $this->strings['bad_request']);

if ( is_plugin_active($plugin) ) {
			//Deactivate the plugin silently, Prevent deactivation hooks from running.
			deactivate_plugins($plugin, true);
		}

return $return;
	}

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

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

$plugin = isset($plugin['plugin']) ? $plugin['plugin'] : '';
		if ( empty($plugin) )
			return new WP_Error('bad_request', $this->strings['bad_request']);

$plugins_dir = $wp_filesystem->wp_plugins_dir();
		$this_plugin_dir = trailingslashit( dirname($plugins_dir . $plugin) );

if ( ! $wp_filesystem->exists($this_plugin_dir) ) //If it's already vanished.
			return $removed;

// If plugin is in its own directory, recursively delete the directory.
		if ( strpos($plugin, '/') && $this_plugin_dir != $plugins_dir ) //base check on if plugin includes directory separator AND that it's not the root plugin folder
			$deleted = $wp_filesystem->delete($this_plugin_dir, true);
		else
			$deleted = $wp_filesystem->delete($plugins_dir . $plugin);

if ( ! $deleted )
			return new WP_Error('remove_old_failed', $this->strings['remove_old_failed']);

return true;
	}
}

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-automatic-upgrader-skin.php	3.027KB	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-installer-skin.php	3.985KB	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
media.php	103.831KB	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
noop.php	1.193KB	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
upgrade.php	93.633KB	Edit File Delete File Rename
user.php	48.255KB	Edit File Delete File Rename
widgets.php	9.767KB	Edit File Delete File Rename