<?php
namespace Egulias\EmailValidator\Parser;
use Egulias\EmailValidator\EmailLexer;
use Egulias\EmailValidator\Result\Result;
use Egulias\EmailValidator\Result\ValidEmail;
use Egulias\EmailValidator\Result\InvalidEmail;
use Egulias\EmailValidator\Warning\CFWSWithFWS;
use Egulias\EmailValidator\Warning\IPV6BadChar;
use Egulias\EmailValidator\Result\Reason\CRNoLF;
use Egulias\EmailValidator\Warning\IPV6ColonEnd;
use Egulias\EmailValidator\Warning\IPV6MaxGroups;
use Egulias\EmailValidator\Warning\ObsoleteDTEXT;
use Egulias\EmailValidator\Warning\AddressLiteral;
use Egulias\EmailValidator\Warning\IPV6ColonStart;
use Egulias\EmailValidator\Warning\IPV6Deprecated;
use Egulias\EmailValidator\Warning\IPV6GroupCount;
use Egulias\EmailValidator\Warning\IPV6DoubleColon;
use Egulias\EmailValidator\Result\Reason\ExpectingDTEXT;
use Egulias\EmailValidator\Result\Reason\UnusualElements;
use Egulias\EmailValidator\Warning\DomainLiteral as WarningDomainLiteral;
class DomainLiteral extends PartParser
{
public const IPV4_REGEX = '/\\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/';
public const OBSOLETE_WARNINGS = [
EmailLexer::INVALID,
EmailLexer::C_DEL,
EmailLexer::S_LF,
EmailLexer::S_BACKSLASH
];
public function parse() : Result
{
$this->addTagWarnings();
$IPv6TAG = false;
$addressLiteral = '';
do {
if (((array) $this->lexer->token)['type'] === EmailLexer::C_NUL) {
return new InvalidEmail(new ExpectingDTEXT(), ((array) $this->lexer->token)['value']);
}
$this->addObsoleteWarnings();
if ($this->lexer->isNextTokenAny(array(EmailLexer::S_OPENBRACKET, EmailLexer::S_OPENBRACKET))) {
return new InvalidEmail(new ExpectingDTEXT(), ((array) $this->lexer->token)['value']);
}
if ($this->lexer->isNextTokenAny(
array(EmailLexer::S_HTAB, EmailLexer::S_SP, EmailLexer::CRLF)
)) {
$this->warnings[CFWSWithFWS::CODE] = new CFWSWithFWS();
$this->parseFWS();
}
if ($this->lexer->isNextToken(EmailLexer::S_CR)) {
return new InvalidEmail(new CRNoLF(), ((array) $this->lexer->token)['value']);
}
if (((array) $this->lexer->token)['type'] === EmailLexer::S_BACKSLASH) {
return new InvalidEmail(new UnusualElements(((array) $this->lexer->token)['value']), ((array) $this->lexer->token)['value']);
}
if (((array) $this->lexer->token)['type'] === EmailLexer::S_IPV6TAG) {
$IPv6TAG = true;
}
if (((array) $this->lexer->token)['type'] === EmailLexer::S_CLOSEBRACKET) {
break;
}
$addressLiteral .= ((array) $this->lexer->token)['value'];
} while ($this->lexer->moveNext());
//Encapsulate
$addressLiteral = str_replace('[', '', $addressLiteral);
$isAddressLiteralIPv4 = $this->checkIPV4Tag($addressLiteral);
if (!$isAddressLiteralIPv4) {
return new ValidEmail();
} else {
$addressLiteral = $this->convertIPv4ToIPv6($addressLiteral);
}
if (!$IPv6TAG) {
$this->warnings[WarningDomainLiteral::CODE] = new WarningDomainLiteral();
return new ValidEmail();
}
$this->warnings[AddressLiteral::CODE] = new AddressLiteral();
$this->checkIPV6Tag($addressLiteral);
return new ValidEmail();
}
/**
* @param string $addressLiteral
* @param int $maxGroups
*/
public function checkIPV6Tag($addressLiteral, $maxGroups = 8) : void
{
$prev = $this->lexer->getPrevious();
if ($prev['type'] === EmailLexer::S_COLON) {
$this->warnings[IPV6ColonEnd::CODE] = new IPV6ColonEnd();
}
$IPv6 = substr($addressLiteral, 5);
//Daniel Marschall's new IPv6 testing strategy
$matchesIP = explode(':', $IPv6);
$groupCount = count($matchesIP);
$colons = strpos($IPv6, '::');
if (count(preg_grep('/^[0-9A-Fa-f]{0,4}$/', $matchesIP, PREG_GREP_INVERT)) !== 0) {
$this->warnings[IPV6BadChar::CODE] = new IPV6BadChar();
}
if ($colons === false) {
// We need exactly the right number of groups
if ($groupCount !== $maxGroups) {
$this->warnings[IPV6GroupCount::CODE] = new IPV6GroupCount();
}
return;
}
if ($colons !== strrpos($IPv6, '::')) {
$this->warnings[IPV6DoubleColon::CODE] = new IPV6DoubleColon();
return;
}
if ($colons === 0 || $colons === (strlen($IPv6) - 2)) {
// RFC 4291 allows :: at the start or end of an address
//with 7 other groups in addition
++$maxGroups;
}
if ($groupCount > $maxGroups) {
$this->warnings[IPV6MaxGroups::CODE] = new IPV6MaxGroups();
} elseif ($groupCount === $maxGroups) {
$this->warnings[IPV6Deprecated::CODE] = new IPV6Deprecated();
}
}
public function convertIPv4ToIPv6(string $addressLiteralIPv4) : string
{
$matchesIP = [];
$IPv4Match = preg_match(self::IPV4_REGEX, $addressLiteralIPv4, $matchesIP);
// Extract IPv4 part from the end of the address-literal (if there is one)
if ($IPv4Match > 0) {
$index = (int) strrpos($addressLiteralIPv4, $matchesIP[0]);
//There's a match but it is at the start
if ($index > 0) {
// Convert IPv4 part to IPv6 format for further testing
return substr($addressLiteralIPv4, 0, $index) . '0:0';
}
}
return $addressLiteralIPv4;
}
/**
* @param string $addressLiteral
*
* @return bool
*/
protected function checkIPV4Tag($addressLiteral) : bool
{
$matchesIP = [];
$IPv4Match = preg_match(self::IPV4_REGEX, $addressLiteral, $matchesIP);
// Extract IPv4 part from the end of the address-literal (if there is one)
if ($IPv4Match > 0) {
$index = strrpos($addressLiteral, $matchesIP[0]);
//There's a match but it is at the start
if ($index === 0) {
$this->warnings[AddressLiteral::CODE] = new AddressLiteral();
return false;
}
}
return true;
}
private function addObsoleteWarnings() : void
{
if(in_array(((array) $this->lexer->token)['type'], self::OBSOLETE_WARNINGS)) {
$this->warnings[ObsoleteDTEXT::CODE] = new ObsoleteDTEXT();
}
}
private function addTagWarnings() : void
{
if ($this->lexer->isNextToken(EmailLexer::S_COLON)) {
$this->warnings[IPV6ColonStart::CODE] = new IPV6ColonStart();
}
if ($this->lexer->isNextToken(EmailLexer::S_IPV6TAG)) {
$lexer = clone $this->lexer;
$lexer->moveNext();
if ($lexer->isNextToken(EmailLexer::S_DOUBLECOLON)) {
$this->warnings[IPV6ColonStart::CODE] = new IPV6ColonStart();
}
}
}
}
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