359 lines
11 KiB
PHP
359 lines
11 KiB
PHP
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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Mailer\Transport\Smtp;
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use Psr\EventDispatcher\EventDispatcherInterface;
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use Psr\Log\LoggerInterface;
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use Symfony\Component\Mailer\Envelope;
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use Symfony\Component\Mailer\Exception\LogicException;
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use Symfony\Component\Mailer\Exception\TransportException;
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use Symfony\Component\Mailer\Exception\TransportExceptionInterface;
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use Symfony\Component\Mailer\SentMessage;
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use Symfony\Component\Mailer\Transport\AbstractTransport;
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use Symfony\Component\Mailer\Transport\Smtp\Stream\AbstractStream;
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use Symfony\Component\Mailer\Transport\Smtp\Stream\SocketStream;
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use Symfony\Component\Mime\RawMessage;
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/**
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* Sends emails over SMTP.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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* @author Chris Corbyn
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*/
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class SmtpTransport extends AbstractTransport
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{
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private bool $started = false;
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private int $restartThreshold = 100;
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private int $restartThresholdSleep = 0;
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private int $restartCounter = 0;
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private int $pingThreshold = 100;
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private float $lastMessageTime = 0;
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private $stream;
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private string $domain = '[127.0.0.1]';
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public function __construct(AbstractStream $stream = null, EventDispatcherInterface $dispatcher = null, LoggerInterface $logger = null)
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{
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parent::__construct($dispatcher, $logger);
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$this->stream = $stream ?? new SocketStream();
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}
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public function getStream(): AbstractStream
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{
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return $this->stream;
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}
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/**
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* Sets the maximum number of messages to send before re-starting the transport.
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*
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* By default, the threshold is set to 100 (and no sleep at restart).
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*
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* @param int $threshold The maximum number of messages (0 to disable)
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* @param int $sleep The number of seconds to sleep between stopping and re-starting the transport
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*
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* @return $this
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*/
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public function setRestartThreshold(int $threshold, int $sleep = 0): static
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{
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$this->restartThreshold = $threshold;
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$this->restartThresholdSleep = $sleep;
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return $this;
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}
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/**
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* Sets the minimum number of seconds required between two messages, before the server is pinged.
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* If the transport wants to send a message and the time since the last message exceeds the specified threshold,
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* the transport will ping the server first (NOOP command) to check if the connection is still alive.
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* Otherwise the message will be sent without pinging the server first.
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*
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* Do not set the threshold too low, as the SMTP server may drop the connection if there are too many
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* non-mail commands (like pinging the server with NOOP).
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*
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* By default, the threshold is set to 100 seconds.
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*
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* @param int $seconds The minimum number of seconds between two messages required to ping the server
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*
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* @return $this
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*/
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public function setPingThreshold(int $seconds): static
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{
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$this->pingThreshold = $seconds;
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return $this;
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}
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/**
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* Sets the name of the local domain that will be used in HELO.
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*
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* This should be a fully-qualified domain name and should be truly the domain
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* you're using.
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*
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* If your server does not have a domain name, use the IP address. This will
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* automatically be wrapped in square brackets as described in RFC 5321,
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* section 4.1.3.
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*
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* @return $this
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*/
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public function setLocalDomain(string $domain): static
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{
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if ('' !== $domain && '[' !== $domain[0]) {
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if (filter_var($domain, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV4)) {
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$domain = '['.$domain.']';
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} elseif (filter_var($domain, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV6)) {
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$domain = '[IPv6:'.$domain.']';
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}
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}
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$this->domain = $domain;
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return $this;
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}
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/**
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* Gets the name of the domain that will be used in HELO.
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*
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* If an IP address was specified, this will be returned wrapped in square
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* brackets as described in RFC 5321, section 4.1.3.
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*/
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public function getLocalDomain(): string
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{
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return $this->domain;
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}
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public function send(RawMessage $message, Envelope $envelope = null): ?SentMessage
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{
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try {
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$message = parent::send($message, $envelope);
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} catch (TransportExceptionInterface $e) {
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if ($this->started) {
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try {
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$this->executeCommand("RSET\r\n", [250]);
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} catch (TransportExceptionInterface $_) {
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// ignore this exception as it probably means that the server error was final
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}
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}
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throw $e;
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}
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$this->checkRestartThreshold();
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return $message;
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}
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public function __toString(): string
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{
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if ($this->stream instanceof SocketStream) {
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$name = sprintf('smtp%s://%s', ($tls = $this->stream->isTLS()) ? 's' : '', $this->stream->getHost());
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$port = $this->stream->getPort();
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if (!(25 === $port || ($tls && 465 === $port))) {
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$name .= ':'.$port;
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}
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return $name;
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}
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return 'smtp://sendmail';
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}
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/**
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* Runs a command against the stream, expecting the given response codes.
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*
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* @param int[] $codes
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*
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* @throws TransportException when an invalid response if received
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*
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* @internal
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*/
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public function executeCommand(string $command, array $codes): string
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{
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$this->stream->write($command);
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$response = $this->getFullResponse();
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$this->assertResponseCode($response, $codes);
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return $response;
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}
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protected function doSend(SentMessage $message): void
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{
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if (microtime(true) - $this->lastMessageTime > $this->pingThreshold) {
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$this->ping();
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}
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if (!$this->started) {
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$this->start();
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}
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try {
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$envelope = $message->getEnvelope();
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$this->doMailFromCommand($envelope->getSender()->getEncodedAddress());
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foreach ($envelope->getRecipients() as $recipient) {
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$this->doRcptToCommand($recipient->getEncodedAddress());
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}
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$this->executeCommand("DATA\r\n", [354]);
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try {
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foreach (AbstractStream::replace("\r\n.", "\r\n..", $message->toIterable()) as $chunk) {
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$this->stream->write($chunk, false);
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}
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$this->stream->flush();
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} catch (TransportExceptionInterface $e) {
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throw $e;
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} catch (\Exception $e) {
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$this->stream->terminate();
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$this->started = false;
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$this->getLogger()->debug(sprintf('Email transport "%s" stopped', __CLASS__));
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throw $e;
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}
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$this->executeCommand("\r\n.\r\n", [250]);
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$message->appendDebug($this->stream->getDebug());
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$this->lastMessageTime = microtime(true);
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} catch (TransportExceptionInterface $e) {
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$e->appendDebug($this->stream->getDebug());
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$this->lastMessageTime = 0;
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throw $e;
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}
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}
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protected function doHeloCommand(): void
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{
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$this->executeCommand(sprintf("HELO %s\r\n", $this->domain), [250]);
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}
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private function doMailFromCommand(string $address): void
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{
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$this->executeCommand(sprintf("MAIL FROM:<%s>\r\n", $address), [250]);
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}
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private function doRcptToCommand(string $address): void
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{
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$this->executeCommand(sprintf("RCPT TO:<%s>\r\n", $address), [250, 251, 252]);
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}
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private function start(): void
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{
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if ($this->started) {
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return;
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}
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$this->getLogger()->debug(sprintf('Email transport "%s" starting', __CLASS__));
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$this->stream->initialize();
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$this->assertResponseCode($this->getFullResponse(), [220]);
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$this->doHeloCommand();
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$this->started = true;
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$this->lastMessageTime = 0;
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$this->getLogger()->debug(sprintf('Email transport "%s" started', __CLASS__));
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}
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private function stop(): void
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{
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if (!$this->started) {
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return;
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}
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$this->getLogger()->debug(sprintf('Email transport "%s" stopping', __CLASS__));
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try {
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$this->executeCommand("QUIT\r\n", [221]);
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} catch (TransportExceptionInterface $e) {
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} finally {
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$this->stream->terminate();
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$this->started = false;
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$this->getLogger()->debug(sprintf('Email transport "%s" stopped', __CLASS__));
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}
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}
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private function ping(): void
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{
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if (!$this->started) {
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return;
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}
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try {
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$this->executeCommand("NOOP\r\n", [250]);
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} catch (TransportExceptionInterface $e) {
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$this->stop();
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}
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}
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/**
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* @throws TransportException if a response code is incorrect
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*/
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private function assertResponseCode(string $response, array $codes): void
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{
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if (!$codes) {
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throw new LogicException('You must set the expected response code.');
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}
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[$code] = sscanf($response, '%3d');
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$valid = \in_array($code, $codes);
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if (!$valid || !$response) {
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$codeStr = $code ? sprintf('code "%s"', $code) : 'empty code';
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$responseStr = $response ? sprintf(', with message "%s"', trim($response)) : '';
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throw new TransportException(sprintf('Expected response code "%s" but got ', implode('/', $codes)).$codeStr.$responseStr.'.', $code ?: 0);
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}
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}
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private function getFullResponse(): string
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{
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$response = '';
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do {
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$line = $this->stream->readLine();
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$response .= $line;
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} while ($line && isset($line[3]) && ' ' !== $line[3]);
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return $response;
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}
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private function checkRestartThreshold(): void
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{
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// when using sendmail via non-interactive mode, the transport is never "started"
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if (!$this->started) {
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return;
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}
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++$this->restartCounter;
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if ($this->restartCounter < $this->restartThreshold) {
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return;
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}
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$this->stop();
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if (0 < $sleep = $this->restartThresholdSleep) {
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$this->getLogger()->debug(sprintf('Email transport "%s" sleeps for %d seconds after stopping', __CLASS__, $sleep));
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sleep($sleep);
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}
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$this->start();
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$this->restartCounter = 0;
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}
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public function __sleep(): array
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{
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throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
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}
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public function __wakeup()
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{
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throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
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}
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public function __destruct()
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{
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$this->stop();
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}
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}
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