*/ final class TLDConverter { private const IANA_DATE_FORMAT = 'D M d H:i:s Y e'; /** * Converts the IANA Root Zone Database into a TopLevelDomains associative array. * * @param string $content * * @throws CouldNotLoadTLDs if the content is invalid or can not be correctly parsed and converted * * @return array */ public function convert(string $content): array { $data = []; $file = new SplTempFileObject(); $file->fwrite($content); $file->setFlags(SplTempFileObject::DROP_NEW_LINE | SplTempFileObject::READ_AHEAD | SplTempFileObject::SKIP_EMPTY); /** @var string $line */ foreach ($file as $line) { $line = trim($line); if ([] === $data) { $data = $this->extractHeader($line); continue; } if (false === strpos($line, '#')) { $data['records'] = $data['records'] ?? []; $data['records'][] = $this->extractRootZone($line); continue; } throw new CouldNotLoadTLDs(sprintf('Invalid line content: %s', $line)); } if (isset($data['version'], $data['modifiedDate'], $data['records'])) { return $data; } throw new CouldNotLoadTLDs(sprintf('Invalid content: TLD conversion failed')); } /** * Extract IANA Root Zone Database header info. * * @param string $content * * @throws CouldNotLoadTLDs if the Header line is invalid * * @return array */ private function extractHeader(string $content): array { if (1 !== preg_match('/^\# Version (?\d+), Last Updated (?.*?)$/', $content, $matches)) { throw new CouldNotLoadTLDs(sprintf('Invalid Version line: %s', $content)); } /** @var DateTimeImmutable $date */ $date = DateTimeImmutable::createFromFormat(self::IANA_DATE_FORMAT, $matches['date']); return [ 'version' => $matches['version'], 'modifiedDate' => $date->format(DATE_ATOM), ]; } /** * Extract IANA Root Zone. * * @param string $content * * @throws CouldNotLoadTLDs If the Root Zone is invalid * * @return string */ private function extractRootZone(string $content): string { try { $tld = (new PublicSuffix($content))->toAscii(); } catch (Exception $exception) { throw new CouldNotLoadTLDs(sprintf('Invalid Root zone: %s', $content), 0, $exception); } if (1 !== $tld->count() || '' === $tld->getContent()) { throw new CouldNotLoadTLDs(sprintf('Invalid Root zone: %s', $content)); } return (string) $tld; } }