class RarDownloader

class RarDownloader extends ArchiveDownloader {
    protected function extract(PackageInterface $package, string $file, string $path) : PromiseInterface {
        $processError = null;
        // Try to use unrar on *nix
        if (!Platform::isWindows()) {
            $command = [
                'sh',
                '-c',
                'unrar x -- "$0" "$1" >/dev/null && chmod -R u+w "$1"',
                $file,
                $path,
            ];
            if (0 === $this->process
                ->execute($command, $ignoredOutput)) {
                return \React\Promise\resolve(null);
            }
            $processError = 'Failed to execute ' . implode(' ', $command) . "\n\n" . $this->process
                ->getErrorOutput();
        }
        if (!class_exists('RarArchive')) {
            // php.ini path is added to the error message to help users find the correct file
            $iniMessage = IniHelper::getMessage();
            $error = "Could not decompress the archive, enable the PHP rar extension or install unrar.\n" . $iniMessage . "\n" . $processError;
            if (!Platform::isWindows()) {
                $error = "Could not decompress the archive, enable the PHP rar extension.\n" . $iniMessage;
            }
            throw new \RuntimeException($error);
        }
        $rarArchive = RarArchive::open($file);
        if (false === $rarArchive) {
            throw new \UnexpectedValueException('Could not open RAR archive: ' . $file);
        }
        $entries = $rarArchive->getEntries();
        if (false === $entries) {
            throw new \RuntimeException('Could not retrieve RAR archive entries');
        }
        foreach ($entries as $entry) {
            if (false === $entry->extract($path)) {
                throw new \RuntimeException('Could not extract entry');
            }
        }
        $rarArchive->close();
        return \React\Promise\resolve(null);
    }

}