Viewing file:  DNSCheckValidation.php (5.13 KB) -rwxrwxr-x
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<?php
namespace Egulias\EmailValidator\Validation;
use Egulias\EmailValidator\EmailLexer;
use Egulias\EmailValidator\Result\InvalidEmail;
use Egulias\EmailValidator\Result\Reason\DomainAcceptsNoMail;
use Egulias\EmailValidator\Result\Reason\LocalOrReservedDomain;
use Egulias\EmailValidator\Result\Reason\NoDNSRecord as ReasonNoDNSRecord;
use Egulias\EmailValidator\Result\Reason\UnableToGetDNSRecord;
use Egulias\EmailValidator\Warning\NoDNSMXRecord;
class DNSCheckValidation implements EmailValidation
{
/**
* @var int
*/
protected const DNS_RECORD_TYPES_TO_CHECK = DNS_MX + DNS_A + DNS_AAAA;
/**
* @var array
*/
private $warnings = [];
/**
* @var InvalidEmail|null
*/
private $error;
/**
* @var array
*/
private $mxRecords = [];
public function __construct()
{
if (!function_exists('idn_to_ascii')) {
throw new \LogicException(sprintf('The %s class requires the Intl extension.', __CLASS__));
}
}
public function isValid(string $email, EmailLexer $emailLexer) : bool
{
// use the input to check DNS if we cannot extract something similar to a domain
$host = $email;
// Arguable pattern to extract the domain. Not aiming to validate the domain nor the email
if (false !== $lastAtPos = strrpos($email, '@')) {
$host = substr($email, $lastAtPos + 1);
}
// Get the domain parts
$hostParts = explode('.', $host);
// Reserved Top Level DNS Names (https://tools.ietf.org/html/rfc2606#section-2),
// mDNS and private DNS Namespaces (https://tools.ietf.org/html/rfc6762#appendix-G)
$reservedTopLevelDnsNames = [
// Reserved Top Level DNS Names
'test',
'example',
'invalid',
'localhost',
// mDNS
'local',
// Private DNS Namespaces
'intranet',
'internal',
'private',
'corp',
'home',
'lan',
];
$isLocalDomain = count($hostParts) <= 1;
$isReservedTopLevel = in_array($hostParts[(count($hostParts) - 1)], $reservedTopLevelDnsNames, true);
// Exclude reserved top level DNS names
if ($isLocalDomain || $isReservedTopLevel) {
$this->error = new InvalidEmail(new LocalOrReservedDomain(), $host);
return false;
}
return $this->checkDns($host);
}
public function getError() : ?InvalidEmail
{
return $this->error;
}
public function getWarnings() : array
{
return $this->warnings;
}
/**
* @param string $host
*
* @return bool
*/
protected function checkDns($host)
{
$variant = INTL_IDNA_VARIANT_UTS46;
$host = rtrim(idn_to_ascii($host, IDNA_DEFAULT, $variant), '.') . '.';
return $this->validateDnsRecords($host);
}
/**
* Validate the DNS records for given host.
*
* @param string $host A set of DNS records in the format returned by dns_get_record.
*
* @return bool True on success.
*/
private function validateDnsRecords($host) : bool
{
// A workaround to fix https://bugs.php.net/bug.php?id=73149
/** @psalm-suppress InvalidArgument */
set_error_handler(
static function (int $errorLevel, string $errorMessage): ?bool {
throw new \RuntimeException("Unable to get DNS record for the host: $errorMessage");
}
);
try {
// Get all MX, A and AAAA DNS records for host
$dnsRecords = dns_get_record($host, static::DNS_RECORD_TYPES_TO_CHECK);
} catch (\RuntimeException $exception) {
$this->error = new InvalidEmail(new UnableToGetDNSRecord(), '');
return false;
} finally {
restore_error_handler();
}
// No MX, A or AAAA DNS records
if ($dnsRecords === [] || $dnsRecords === false) {
$this->error = new InvalidEmail(new ReasonNoDNSRecord(), '');
return false;
}
// For each DNS record
foreach ($dnsRecords as $dnsRecord) {
if (!$this->validateMXRecord($dnsRecord)) {
// No MX records (fallback to A or AAAA records)
if (empty($this->mxRecords)) {
$this->warnings[NoDNSMXRecord::CODE] = new NoDNSMXRecord();
}
return false;
}
}
return true;
}
/**
* Validate an MX record
*
* @param array $dnsRecord Given DNS record.
*
* @return bool True if valid.
*/
private function validateMxRecord($dnsRecord) : bool
{
if ($dnsRecord['type'] !== 'MX') {
return true;
}
// "Null MX" record indicates the domain accepts no mail (https://tools.ietf.org/html/rfc7505)
if (empty($dnsRecord['target']) || $dnsRecord['target'] === '.') {
$this->error = new InvalidEmail(new DomainAcceptsNoMail(), "");
return false;
}
$this->mxRecords[] = $dnsRecord;
return true;
}
}
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