voku\helper\EmailCheck::isValid()

Complexity

Conditions	35
Paths	968

Size

Total Lines	166
Code Lines	99

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	91
CRAP Score	35.893

Importance

Changes	6
Bugs	1	Features	0

<?php
  public static function isValid($email, $useExampleDomainCheck = false, $useTypoInDomainCheck = false, $useTemporaryDomainCheck = false, $useDnsCheck = false)
  {
    // must be a string
    if (!is_string($email)) {
      return false;
    }

    // make sure string length is limited to avoid DOS attacks
    $emailStringLength = strlen($email);
    if (
        $emailStringLength >= 320
        ||
        $emailStringLength <= 2 // i@y //
    ) {
      return false;
    }
    unset($emailStringLength);

    $email = str_replace(
        array(
            '.', // non-Latin chars are also allowed | https://tools.ietf.org/html/rfc6530
            '＠', // non-Latin chars are also allowed | https://tools.ietf.org/html/rfc6530
        ),
        array(
            '.',
            '@',
        ),
        $email
    );

    if (
        (strpos($email, '@') === false) // "at" is needed
        ||
        (strpos($email, '.') === false && strpos($email, ':') === false) // "dot" or "colon" is needed
    ) {
      return false;
    }

    if (!preg_match('/^(?<local>.*<?)(?:.*)@(?<domain>.*)(?:>?)$/', $email, $parts)) {
      return false;
    }

    $local = $parts['local'];
    $domain = $parts['domain'];

    if (!$local) {
      return false;
    }

    if (!$domain) {
      return false;
    }

    // Escaped spaces are allowed in the "local"-part.
    $local = str_replace('\\ ', '', $local);

    // Spaces in quotes e.g. "firstname lastname"@foo.bar are also allowed in the "local"-part.
    $quoteHelperForIdn = false;
    if (preg_match('/^"(?<inner>[^"]*)"$/mU', $local, $parts)) {
      $quoteHelperForIdn = true;
      $local = trim(
          str_replace(
              $parts['inner'],
              str_replace(' ', '', $parts['inner']),
              $local
          ),
          '"'
      );
    }

    if (
        strpos($local, ' ') !== false // no spaces allowed, anymore
        ||
        strpos($local, '".') !== false // no quote + dot allowed
    ) {
      return false;
    }

    if (
        function_exists('idn_to_ascii')
        &&
        UTF8::max_chr_width($email) <= 3 // check for unicode chars with more then 3 bytes
    ) {

      // https://git.ispconfig.org/ispconfig/ispconfig3/blob/master/interface/lib/classes/functions.inc.php#L305
      if (
          defined('IDNA_NONTRANSITIONAL_TO_ASCII')
          &&
          defined('INTL_IDNA_VARIANT_UTS46')
          &&
          constant('IDNA_NONTRANSITIONAL_TO_ASCII')
      ) {
        $useIdnaUts46 = true;
      } else {
        $useIdnaUts46 = false;
      }

      if ($useIdnaUts46 === true) {
        $localTmp = idn_to_ascii($local, IDNA_NONTRANSITIONAL_TO_ASCII, INTL_IDNA_VARIANT_UTS46);
      } else {
        $localTmp = idn_to_ascii($local);
      }
      if ($localTmp) {
        $local = $localTmp;
      }
      unset($localTmp);

      if ($useIdnaUts46 === true) {
        $domainTmp = idn_to_ascii($domain, IDNA_NONTRANSITIONAL_TO_ASCII, INTL_IDNA_VARIANT_UTS46);
      } else {
        $domainTmp = idn_to_ascii($domain);
      }
      if ($domainTmp) {
        $domain = $domainTmp;
      }
      unset($domainTmp);

    } else {

      static $punycode = null;
      if ($punycode === null) {
        $punycode = new Punycode();
      }

      try {
        $local = $punycode->encode($local);
      } catch (LabelOutOfBoundsException $e) {
        $local = '';
      }

      try {
        $domain = $punycode->encode($domain);
      } catch (LabelOutOfBoundsException $e) {
        $domain = '';
      }

    }

    if ($quoteHelperForIdn === true) {
      $local = '"' . $local . '"';
    }

    $email = $local . '@' . $domain;

    if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
      return false;
    }

    if ($useExampleDomainCheck === true && self::isExampleDomain($domain) === true) {
      return false;
    }

    if ($useTypoInDomainCheck === true && self::isTypoInDomain($domain) === true) {
      return false;
    }

    if ($useTemporaryDomainCheck === true && self::isTemporaryDomain($domain) === true) {
      return false;
    }

    if ($useDnsCheck === true && self::isDnsError($domain) === true) {
      return false;
    }

    return true;
  }