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<?php |
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namespace Egulias\EmailValidator\Validation; |
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use Egulias\EmailValidator\EmailLexer; |
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use Egulias\EmailValidator\Result\InvalidEmail; |
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use Egulias\EmailValidator\Result\Reason\DomainAcceptsNoMail; |
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use Egulias\EmailValidator\Result\Reason\LocalOrReservedDomain; |
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use Egulias\EmailValidator\Result\Reason\NoDNSRecord as ReasonNoDNSRecord; |
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use Egulias\EmailValidator\Result\Reason\UnableToGetDNSRecord; |
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use Egulias\EmailValidator\Warning\NoDNSMXRecord; |
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class DNSCheckValidation implements EmailValidation |
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{ |
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/** |
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* @var int |
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*/ |
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protected const DNS_RECORD_TYPES_TO_CHECK = DNS_MX + DNS_A + DNS_AAAA; |
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/** |
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* Reserved Top Level DNS Names (https://tools.ietf.org/html/rfc2606#section-2), |
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* mDNS and private DNS Namespaces (https://tools.ietf.org/html/rfc6762#appendix-G) |
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*/ |
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const RESERVED_DNS_TOP_LEVEL_NAMES = [ |
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// Reserved Top Level DNS Names |
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'test', |
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'example', |
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'invalid', |
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'localhost', |
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// mDNS |
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'local', |
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// Private DNS Namespaces |
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'intranet', |
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'internal', |
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'private', |
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'corp', |
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'home', |
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'lan', |
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]; |
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/** |
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* @var array |
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*/ |
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private $warnings = []; |
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/** |
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* @var InvalidEmail|null |
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*/ |
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private $error; |
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/** |
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* @var array |
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*/ |
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private $mxRecords = []; |
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public function __construct() |
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{ |
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if (!function_exists('idn_to_ascii')) { |
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throw new \LogicException(sprintf('The %s class requires the Intl extension.', __CLASS__)); |
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} |
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} |
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public function isValid(string $email, EmailLexer $emailLexer) : bool |
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{ |
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// use the input to check DNS if we cannot extract something similar to a domain |
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$host = $email; |
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// Arguable pattern to extract the domain. Not aiming to validate the domain nor the email |
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if (false !== $lastAtPos = strrpos($email, '@')) { |
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$host = substr($email, $lastAtPos + 1); |
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} |
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// Get the domain parts |
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$hostParts = explode('.', $host); |
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$isLocalDomain = count($hostParts) <= 1; |
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$isReservedTopLevel = in_array($hostParts[(count($hostParts) - 1)], self::RESERVED_DNS_TOP_LEVEL_NAMES, true); |
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// Exclude reserved top level DNS names |
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if ($isLocalDomain || $isReservedTopLevel) { |
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$this->error = new InvalidEmail(new LocalOrReservedDomain(), $host); |
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return false; |
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} |
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return $this->checkDns($host); |
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} |
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public function getError() : ?InvalidEmail |
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{ |
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return $this->error; |
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} |
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public function getWarnings() : array |
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{ |
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return $this->warnings; |
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} |
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/** |
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* @param string $host |
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* |
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* @return bool |
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*/ |
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protected function checkDns($host) |
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{ |
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$variant = INTL_IDNA_VARIANT_UTS46; |
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$host = rtrim(idn_to_ascii($host, IDNA_DEFAULT, $variant), '.') . '.'; |
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return $this->validateDnsRecords($host); |
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} |
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/** |
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* Validate the DNS records for given host. |
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* |
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* @param string $host A set of DNS records in the format returned by dns_get_record. |
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* |
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* @return bool True on success. |
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*/ |
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private function validateDnsRecords($host) : bool |
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{ |
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// A workaround to fix https://bugs.php.net/bug.php?id=73149 |
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/** @psalm-suppress InvalidArgument */ |
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set_error_handler( |
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static function (int $errorLevel, string $errorMessage): ?bool { |
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throw new \RuntimeException("Unable to get DNS record for the host: $errorMessage"); |
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} |
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); |
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try { |
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// Get all MX, A and AAAA DNS records for host |
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$dnsRecords = dns_get_record($host, static::DNS_RECORD_TYPES_TO_CHECK); |
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} catch (\RuntimeException $exception) { |
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$this->error = new InvalidEmail(new UnableToGetDNSRecord(), ''); |
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return false; |
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} finally { |
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restore_error_handler(); |
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} |
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// No MX, A or AAAA DNS records |
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if ($dnsRecords === [] || $dnsRecords === false) { |
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$this->error = new InvalidEmail(new ReasonNoDNSRecord(), ''); |
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return false; |
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} |
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// For each DNS record |
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foreach ($dnsRecords as $dnsRecord) { |
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if (!$this->validateMXRecord($dnsRecord)) { |
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// No MX records (fallback to A or AAAA records) |
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if (empty($this->mxRecords)) { |
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$this->warnings[NoDNSMXRecord::CODE] = new NoDNSMXRecord(); |
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} |
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return false; |
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} |
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} |
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return true; |
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} |
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/** |
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* Validate an MX record |
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* |
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* @param array $dnsRecord Given DNS record. |
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* |
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* @return bool True if valid. |
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*/ |
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private function validateMxRecord($dnsRecord) : bool |
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{ |
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if ($dnsRecord['type'] !== 'MX') { |
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return true; |
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} |
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// "Null MX" record indicates the domain accepts no mail (https://tools.ietf.org/html/rfc7505) |
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if (empty($dnsRecord['target']) || $dnsRecord['target'] === '.') { |
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$this->error = new InvalidEmail(new DomainAcceptsNoMail(), ""); |
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return false; |
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} |
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$this->mxRecords[] = $dnsRecord; |
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return true; |
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} |
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} |
egulias /
EmailValidator
