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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Mailer\Transport\Smtp;
use Psr\EventDispatcher\EventDispatcherInterface;
use Psr\Log\LoggerInterface;
use Symfony\Component\Mailer\Exception\TransportException;
use Symfony\Component\Mailer\Exception\TransportExceptionInterface;
use Symfony\Component\Mailer\Transport\Smtp\Auth\AuthenticatorInterface;
use Symfony\Component\Mailer\Transport\Smtp\Stream\AbstractStream;
use Symfony\Component\Mailer\Transport\Smtp\Stream\SocketStream;
/**
* Sends Emails over SMTP with ESMTP support.
*
* @author Fabien Potencier <fabien@symfony.com>
* @author Chris Corbyn
*/
class EsmtpTransport extends SmtpTransport
{
private array $authenticators = [];
private string $username = '';
private string $password = '';
private array $capabilities;
public function __construct(string $host = 'localhost', int $port = 0, bool $tls = null, EventDispatcherInterface $dispatcher = null, LoggerInterface $logger = null, AbstractStream $stream = null, array $authenticators = null)
{
parent::__construct($stream, $dispatcher, $logger);
if (null === $authenticators) {
// fallback to default authenticators
// order is important here (roughly most secure and popular first)
$authenticators = [
new Auth\CramMd5Authenticator(),
new Auth\LoginAuthenticator(),
new Auth\PlainAuthenticator(),
new Auth\XOAuth2Authenticator(),
];
}
$this->setAuthenticators($authenticators);
/** @var SocketStream $stream */
$stream = $this->getStream();
if (null === $tls) {
if (465 === $port) {
$tls = true;
} else {
$tls = \defined('OPENSSL_VERSION_NUMBER') && 0 === $port && 'localhost' !== $host;
}
}
if (!$tls) {
$stream->disableTls();
}
if (0 === $port) {
$port = $tls ? 465 : 25;
}
$stream->setHost($host);
$stream->setPort($port);
}
/**
* @return $this
*/
public function setUsername(string $username): static
{
$this->username = $username;
return $this;
}
public function getUsername(): string
{
return $this->username;
}
/**
* @return $this
*/
public function setPassword(#[\SensitiveParameter] string $password): static
{
$this->password = $password;
return $this;
}
public function getPassword(): string
{
return $this->password;
}
public function setAuthenticators(array $authenticators): void
{
$this->authenticators = [];
foreach ($authenticators as $authenticator) {
$this->addAuthenticator($authenticator);
}
}
public function addAuthenticator(AuthenticatorInterface $authenticator): void
{
$this->authenticators[] = $authenticator;
}
public function executeCommand(string $command, array $codes): string
{
return [250] === $codes && str_starts_with($command, 'HELO ') ? $this->doEhloCommand() : parent::executeCommand($command, $codes);
}
final protected function getCapabilities(): array
{
return $this->capabilities;
}
private function doEhloCommand(): string
{
try {
$response = $this->executeCommand(sprintf("EHLO %s\r\n", $this->getLocalDomain()), [250]);
} catch (TransportExceptionInterface $e) {
try {
return parent::executeCommand(sprintf("HELO %s\r\n", $this->getLocalDomain()), [250]);
} catch (TransportExceptionInterface $ex) {
if (!$ex->getCode()) {
throw $e;
}
throw $ex;
}
}
$this->capabilities = $this->parseCapabilities($response);
/** @var SocketStream $stream */
$stream = $this->getStream();
// WARNING: !$stream->isTLS() is right, 100% sure :)
// if you think that the ! should be removed, read the code again
// if doing so "fixes" your issue then it probably means your SMTP server behaves incorrectly or is wrongly configured
if (!$stream->isTLS() && \defined('OPENSSL_VERSION_NUMBER') && \array_key_exists('STARTTLS', $this->capabilities)) {
$this->executeCommand("STARTTLS\r\n", [220]);
if (!$stream->startTLS()) {
throw new TransportException('Unable to connect with STARTTLS.');
}
$response = $this->executeCommand(sprintf("EHLO %s\r\n", $this->getLocalDomain()), [250]);
$this->capabilities = $this->parseCapabilities($response);
}
if (\array_key_exists('AUTH', $this->capabilities)) {
$this->handleAuth($this->capabilities['AUTH']);
}
return $response;
}
private function parseCapabilities(string $ehloResponse): array
{
$capabilities = [];
$lines = explode("\r\n", trim($ehloResponse));
array_shift($lines);
foreach ($lines as $line) {
if (preg_match('/^[0-9]{3}[ -]([A-Z0-9-]+)((?:[ =].*)?)$/Di', $line, $matches)) {
$value = strtoupper(ltrim($matches[2], ' ='));
$capabilities[strtoupper($matches[1])] = $value ? explode(' ', $value) : [];
}
}
return $capabilities;
}
private function handleAuth(array $modes): void
{
if (!$this->username) {
return;
}
$authNames = [];
$errors = [];
$modes = array_map('strtolower', $modes);
foreach ($this->authenticators as $authenticator) {
if (!\in_array(strtolower($authenticator->getAuthKeyword()), $modes, true)) {
continue;
}
$code = null;
$authNames[] = $authenticator->getAuthKeyword();
try {
$authenticator->authenticate($this);
return;
} catch (TransportExceptionInterface $e) {
$code = $e->getCode();
try {
$this->executeCommand("RSET\r\n", [250]);
} catch (TransportExceptionInterface) {
// ignore this exception as it probably means that the server error was final
}
// keep the error message, but tries the other authenticators
$errors[$authenticator->getAuthKeyword()] = $e->getMessage();
}
}
if (!$authNames) {
throw new TransportException(sprintf('Failed to find an authenticator supported by the SMTP server, which currently supports: "%s".', implode('", "', $modes)), $code ?: 504);
}
$message = sprintf('Failed to authenticate on SMTP server with username "%s" using the following authenticators: "%s".', $this->username, implode('", "', $authNames));
foreach ($errors as $name => $error) {
$message .= sprintf(' Authenticator "%s" returned "%s".', $name, $error);
}
throw new TransportException($message, $code ?: 535);
}
}
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