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<?php
declare( strict_types = 1 );
namespace Automattic\WooCommerce\Internal\Utilities;
use Automattic\Jetpack\Constants;
use Automattic\WooCommerce\Proxies\LegacyProxy;
use Exception;
use WP_Filesystem_Base;
/**
* FilesystemUtil class.
*/
class FilesystemUtil {
/**
* Wrapper to retrieve the class instance contained in the $wp_filesystem global, after initializing if necessary.
*
* @return WP_Filesystem_Base
* @throws Exception Thrown when the filesystem fails to initialize.
*/
public static function get_wp_filesystem(): WP_Filesystem_Base {
global $wp_filesystem;
if ( ! $wp_filesystem instanceof WP_Filesystem_Base ) {
$initialized = self::initialize_wp_filesystem();
if ( false === $initialized ) {
throw new Exception( 'The WordPress filesystem could not be initialized.' );
}
}
return $wp_filesystem;
}
/**
* Get the WP filesystem method, with a fallback to 'direct' if no FS_METHOD constant exists and there are not FTP related options/credentials set.
*
* @return string|false The name of the WP filesystem method to use.
*/
public static function get_wp_filesystem_method_or_direct() {
$proxy = wc_get_container()->get( LegacyProxy::class );
if ( ! self::constant_exists( 'FS_METHOD' ) && false === $proxy->call_function( 'get_option', 'ftp_credentials' ) && ! self::constant_exists( 'FTP_HOST' ) ) {
return 'direct';
}
$method = $proxy->call_function( 'get_filesystem_method' );
if ( $method ) {
return $method;
}
return 'direct';
}
/**
* Check if a constant exists and is not null.
*
* @param string $name Constant name.
* @return bool True if the constant exists and its value is not null.
*/
private static function constant_exists( string $name ): bool {
return Constants::is_defined( $name ) && ! is_null( Constants::get_constant( $name ) );
}
/**
* Recursively creates a directory (if it doesn't exist) and adds an empty index.html and a .htaccess to prevent
* directory listing.
*
* @since 9.3.0
*
* @param string $path Directory to create.
* @throws \Exception In case of error.
*/
public static function mkdir_p_not_indexable( string $path ): void {
$wp_fs = self::get_wp_filesystem();
if ( $wp_fs->is_dir( $path ) ) {
return;
}
if ( ! wp_mkdir_p( $path ) ) {
throw new \Exception( esc_html( sprintf( 'Could not create directory: %s.', wp_basename( $path ) ) ) );
}
$files = array(
'.htaccess' => 'deny from all',
'index.html' => '',
);
foreach ( $files as $name => $content ) {
$wp_fs->put_contents( trailingslashit( $path ) . $name, $content );
}
}
/**
* Wrapper to initialize the WP filesystem with defined credentials if they are available.
*
* @return bool True if the $wp_filesystem global was successfully initialized.
*/
protected static function initialize_wp_filesystem(): bool {
global $wp_filesystem;
if ( $wp_filesystem instanceof WP_Filesystem_Base ) {
return true;
}
require_once ABSPATH . 'wp-admin/includes/file.php';
$method = self::get_wp_filesystem_method_or_direct();
$initialized = false;
if ( 'direct' === $method ) {
$initialized = WP_Filesystem();
} elseif ( false !== $method ) {
// See https://core.trac.wordpress.org/changeset/56341.
ob_start();
$credentials = request_filesystem_credentials( '' );
ob_end_clean();
$initialized = $credentials && WP_Filesystem( $credentials );
}
return is_null( $initialized ) ? false : $initialized;
}
/**
* Validate that a file path is a valid upload path.
*
* @param string $path The path to validate.
* @throws \Exception If the file path is not a valid upload path.
*/
public static function validate_upload_file_path( string $path ): void {
$wp_filesystem = self::get_wp_filesystem();
// File must exist and be readable.
$is_valid_file = $wp_filesystem->is_readable( $path );
// Check that file is within an allowed location.
if ( $is_valid_file ) {
$is_valid_file = self::file_is_in_directory( $path, $wp_filesystem->abspath() );
if ( ! $is_valid_file ) {
$upload_dir = wp_get_upload_dir();
$is_valid_file = false === $upload_dir['error'] && self::file_is_in_directory( $path, $upload_dir['basedir'] );
}
}
if ( ! $is_valid_file ) {
throw new \Exception( esc_html__( 'File path is not a valid upload path.', 'woocommerce' ) );
}
}
/**
* Check if a given file is inside a given directory.
*
* @param string $file_path The full path of the file to check.
* @param string $directory The path of the directory to check.
* @return bool True if the file is inside the directory.
*/
private static function file_is_in_directory( string $file_path, string $directory ): bool {
// Extract protocol if it exists.
$protocol = '';
if ( preg_match( '#^([a-z0-9]+://)#i', $file_path, $matches ) ) {
$protocol = $matches[1];
$file_path = preg_replace( '#^[a-z0-9]+://#i', '', $file_path );
}
$file_path = (string) new URL( $file_path ); // This resolves '/../' sequences.
$file_path = preg_replace( '/^file:\\/\\//', $protocol, $file_path );
$file_path = preg_replace( '/^file:\\/\\//', '', $file_path );
return 0 === stripos( wp_normalize_path( $file_path ), trailingslashit( wp_normalize_path( $directory ) ) );
}
}