WP_Upgrader::install_package( array|string $args = array() ): array|WP_Error

Source

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'];

	if ( function_exists( 'set_time_limit' ) ) {
		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 installation response before the installation has started.
	 *
	 * Returning a value 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   Installation 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 ( 0 === count( $source_files ) ) {
		// There are no files?
		return new WP_Error( 'incompatible_archive_empty', $this->strings['incompatible_archive'], $this->strings['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 $upgrader      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;
	}

	if ( ! empty( $args['hook_extra']['temp_backup'] ) ) {
		$temp_backup = $this->move_to_temp_backup_dir( $args['hook_extra']['temp_backup'] );

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

		$this->temp_backups[] = $args['hook_extra']['temp_backup'];
	}

	// 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, true ) ) {
		$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 true|WP_Error $removed            Whether the destination was cleared.
		 *                                          True upon 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 );
		}
	}

	/*
	 * If 'clear_working' is false, the source should not be removed, so use copy_dir() instead.
	 *
	 * Partial updates, like language packs, may want to retain the destination.
	 * If the destination exists or has contents, this may be a partial update,
	 * and the destination should not be removed, so use copy_dir() instead.
	 */
	if ( $args['clear_working']
		&& (
			// Destination does not exist or has no contents.
			! $wp_filesystem->exists( $remote_destination )
			|| empty( $wp_filesystem->dirlist( $remote_destination ) )
		)
	) {
		$result = move_dir( $source, $remote_destination, true );
	} else {
		// 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 );
			}
		}
		$result = copy_dir( $source, $remote_destination );
	}

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

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

	$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;
}

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