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/home/nshryvcy/himaltourism.com/wp-content/plugins/mailpoet/lib/Util/DmarcPolicyChecker.php

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<?php declare(strict_types = 1);

namespace MailPoet\Util;

if (!defined('ABSPATH')) exit;

class DmarcPolicyChecker {
  const POLICY_NONE = 'none';
  const POLICY_REJECT = 'reject';
  const POLICY_QUARANTINE = 'quarantine';

/**
   * Lookup the Domain DMARC Policy
   * returns reject or quarantine or none
   */
  public function getDomainDmarcPolicy(string $domain): string {

if (!$domain) {
      throw new \InvalidArgumentException('Domain is Required');
    }

$dnsLookup = dns_get_record("_dmarc.$domain", DNS_TXT);

if (!is_array($dnsLookup)) {
      return self::POLICY_NONE;
    }

$txtRecord = $dnsLookup[0]['txt'] ?? null;

if (!$txtRecord) {
        // note
        // most DNS may not have this record
        // good to set policy to none in those cases
        return self::POLICY_NONE;
    }

// Check for the presence of v=DMARC1;
    if (stripos($txtRecord, 'dmarc') === false) {
      // this is not a dmarc txt record
      // probably a wrong setup from the user
      return self::POLICY_NONE;
    }

$cache = explode(';', $txtRecord);

$dmarcInfo = [];

foreach ($cache as $value) {
        $item = explode('=', $value);
        $dKey = $item[0] ?? '';
        $dValue = $item[1] ?? '';
        $dmarcInfo[strtolower(trim($dKey))] = strtolower(trim($dValue));
    }

// policy can either be reject or quarantine or none
    $dmarcStatus = $dmarcInfo['p'] ?? self::POLICY_NONE;
    // check for subdomain policy
    $dmarcStatus = (
      isset($dmarcInfo['sp']) &&
      ($dmarcInfo['sp'] === self::POLICY_QUARANTINE ||
      $dmarcInfo['sp'] === self::POLICY_REJECT)
    ) ? $dmarcInfo['sp'] : $dmarcStatus;

return $dmarcStatus;
  }
}

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