_unzip_file_ziparchive( string $file, string $to, string[] $needed_dirs = array() ): true|WP_Error

Source

function _unzip_file_ziparchive( $file, $to, $needed_dirs = array() ) {
	global $wp_filesystem;

	$z = new ZipArchive();

	$zopen = $z->open( $file, ZIPARCHIVE::CHECKCONS );

	if ( true !== $zopen ) {
		return new WP_Error( 'incompatible_archive', __( 'Incompatible Archive.' ), array( 'ziparchive_error' => $zopen ) );
	}

	$uncompressed_size = 0;

	for ( $i = 0; $i < $z->numFiles; $i++ ) {
		$info = $z->statIndex( $i );

		if ( ! $info ) {
			$z->close();
			return new WP_Error( 'stat_failed_ziparchive', __( 'Could not retrieve file from archive.' ) );
		}

		if ( str_starts_with( $info['name'], '__MACOSX/' ) ) { // Skip the OS X-created __MACOSX directory.
			continue;
		}

		// Don't extract invalid files:
		if ( 0 !== validate_file( $info['name'] ) ) {
			continue;
		}

		$uncompressed_size += $info['size'];

		$dirname = dirname( $info['name'] );

		if ( str_ends_with( $info['name'], '/' ) ) {
			// Directory.
			$needed_dirs[] = $to . untrailingslashit( $info['name'] );
		} elseif ( '.' !== $dirname ) {
			// Path to a file.
			$needed_dirs[] = $to . untrailingslashit( $dirname );
		}
	}

	// Enough space to unzip the file and copy its contents, with a 10% buffer.
	$required_space = $uncompressed_size * 2.1;

	/*
	 * disk_free_space() could return false. Assume that any falsey value is an error.
	 * A disk that has zero free bytes has bigger problems.
	 * Require we have enough space to unzip the file and copy its contents, with a 10% buffer.
	 */
	if ( wp_doing_cron() ) {
		$available_space = function_exists( 'disk_free_space' ) ? @disk_free_space( WP_CONTENT_DIR ) : false;

		if ( $available_space && ( $required_space > $available_space ) ) {
			$z->close();
			return new WP_Error(
				'disk_full_unzip_file',
				__( 'Could not copy files. You may have run out of disk space.' ),
				compact( 'uncompressed_size', 'available_space' )
			);
		}
	}

	$needed_dirs = array_unique( $needed_dirs );

	foreach ( $needed_dirs as $dir ) {
		// Check the parent folders of the folders all exist within the creation array.
		if ( untrailingslashit( $to ) === $dir ) { // Skip over the working directory, we know this exists (or will exist).
			continue;
		}

		if ( ! str_contains( $dir, $to ) ) { // If the directory is not within the working directory, skip it.
			continue;
		}

		$parent_folder = dirname( $dir );

		while ( ! empty( $parent_folder )
			&& untrailingslashit( $to ) !== $parent_folder
			&& ! in_array( $parent_folder, $needed_dirs, true )
		) {
			$needed_dirs[] = $parent_folder;
			$parent_folder = dirname( $parent_folder );
		}
	}

	asort( $needed_dirs );

	// Create those directories if need be:
	foreach ( $needed_dirs as $_dir ) {
		// Only check to see if the Dir exists upon creation failure. Less I/O this way.
		if ( ! $wp_filesystem->mkdir( $_dir, FS_CHMOD_DIR ) && ! $wp_filesystem->is_dir( $_dir ) ) {
			$z->close();
			return new WP_Error( 'mkdir_failed_ziparchive', __( 'Could not create directory.' ), $_dir );
		}
	}

	/**
	 * Filters archive unzipping to override with a custom process.
	 *
	 * @since 6.4.0
	 *
	 * @param null|true|WP_Error $result         The result of the override. True on success, otherwise WP Error. Default null.
	 * @param string             $file           Full path and filename of ZIP archive.
	 * @param string             $to             Full path on the filesystem to extract archive to.
	 * @param string[]           $needed_dirs    A full list of required folders that need to be created.
	 * @param float              $required_space The space required to unzip the file and copy its contents, with a 10% buffer.
	 */
	$pre = apply_filters( 'pre_unzip_file', null, $file, $to, $needed_dirs, $required_space );

	if ( null !== $pre ) {
		// Ensure the ZIP file archive has been closed.
		$z->close();

		return $pre;
	}

	for ( $i = 0; $i < $z->numFiles; $i++ ) {
		$info = $z->statIndex( $i );

		if ( ! $info ) {
			$z->close();
			return new WP_Error( 'stat_failed_ziparchive', __( 'Could not retrieve file from archive.' ) );
		}

		if ( str_ends_with( $info['name'], '/' ) ) { // Directory.
			continue;
		}

		if ( str_starts_with( $info['name'], '__MACOSX/' ) ) { // Don't extract the OS X-created __MACOSX directory files.
			continue;
		}

		// Don't extract invalid files:
		if ( 0 !== validate_file( $info['name'] ) ) {
			continue;
		}

		$contents = $z->getFromIndex( $i );

		if ( false === $contents ) {
			$z->close();
			return new WP_Error( 'extract_failed_ziparchive', __( 'Could not extract file from archive.' ), $info['name'] );
		}

		if ( ! $wp_filesystem->put_contents( $to . $info['name'], $contents, FS_CHMOD_FILE ) ) {
			$z->close();
			return new WP_Error( 'copy_failed_ziparchive', __( 'Could not copy file.' ), $info['name'] );
		}
	}

	$z->close();

	/**
	 * Filters the result of unzipping an archive.
	 *
	 * @since 6.4.0
	 *
	 * @param true|WP_Error $result         The result of unzipping the archive. True on success, otherwise WP_Error. Default true.
	 * @param string        $file           Full path and filename of ZIP archive.
	 * @param string        $to             Full path on the filesystem the archive was extracted to.
	 * @param string[]      $needed_dirs    A full list of required folders that were created.
	 * @param float         $required_space The space required to unzip the file and copy its contents, with a 10% buffer.
	 */
	$result = apply_filters( 'unzip_file', true, $file, $to, $needed_dirs, $required_space );

	unset( $needed_dirs );

	return $result;
}

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