first commit

vendor/symfony/mailer/Transport/Smtp/Auth/AuthenticatorInterface.php

@@ -0,0 +1,35 @@
+<?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\Auth;
+
+use Symfony\Component\Mailer\Exception\TransportExceptionInterface;
+use Symfony\Component\Mailer\Transport\Smtp\EsmtpTransport;
+
+/**
+ * An Authentication mechanism.
+ *
+ * @author Chris Corbyn
+ */
+interface AuthenticatorInterface
+{
+    /**
+     * Tries to authenticate the user.
+     *
+     * @throws TransportExceptionInterface
+     */
+    public function authenticate(EsmtpTransport $client): void;
+
+    /**
+     * Gets the name of the AUTH mechanism this Authenticator handles.
+     */
+    public function getAuthKeyword(): string;
+}

vendor/symfony/mailer/Transport/Smtp/Auth/CramMd5Authenticator.php

@@ -0,0 +1,65 @@
+<?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\Auth;
+
+use Symfony\Component\Mailer\Exception\InvalidArgumentException;
+use Symfony\Component\Mailer\Transport\Smtp\EsmtpTransport;
+
+/**
+ * Handles CRAM-MD5 authentication.
+ *
+ * @author Chris Corbyn
+ */
+class CramMd5Authenticator implements AuthenticatorInterface
+{
+    public function getAuthKeyword(): string
+    {
+        return 'CRAM-MD5';
+    }
+
+    /**
+     * @see https://www.ietf.org/rfc/rfc4954.txt
+     */
+    public function authenticate(EsmtpTransport $client): void
+    {
+        $challenge = $client->executeCommand("AUTH CRAM-MD5\r\n", [334]);
+        $challenge = base64_decode(substr($challenge, 4));
+        $message = base64_encode($client->getUsername().' '.$this->getResponse($client->getPassword(), $challenge));
+        $client->executeCommand(sprintf("%s\r\n", $message), [235]);
+    }
+
+    /**
+     * Generates a CRAM-MD5 response from a server challenge.
+     */
+    private function getResponse(#[\SensitiveParameter] string $secret, string $challenge): string
+    {
+        if (!$secret) {
+            throw new InvalidArgumentException('A non-empty secret is required.');
+        }
+
+        if (\strlen($secret) > 64) {
+            $secret = pack('H32', md5($secret));
+        }
+
+        if (\strlen($secret) < 64) {
+            $secret = str_pad($secret, 64, \chr(0));
+        }
+
+        $kipad = substr($secret, 0, 64) ^ str_repeat(\chr(0x36), 64);
+        $kopad = substr($secret, 0, 64) ^ str_repeat(\chr(0x5C), 64);
+
+        $inner = pack('H32', md5($kipad.$challenge));
+        $digest = md5($kopad.$inner);
+
+        return $digest;
+    }
+}

vendor/symfony/mailer/Transport/Smtp/Auth/LoginAuthenticator.php

@@ -0,0 +1,37 @@
+<?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\Auth;
+
+use Symfony\Component\Mailer\Transport\Smtp\EsmtpTransport;
+
+/**
+ * Handles LOGIN authentication.
+ *
+ * @author Chris Corbyn
+ */
+class LoginAuthenticator implements AuthenticatorInterface
+{
+    public function getAuthKeyword(): string
+    {
+        return 'LOGIN';
+    }
+
+    /**
+     * @see https://www.ietf.org/rfc/rfc4954.txt
+     */
+    public function authenticate(EsmtpTransport $client): void
+    {
+        $client->executeCommand("AUTH LOGIN\r\n", [334]);
+        $client->executeCommand(sprintf("%s\r\n", base64_encode($client->getUsername())), [334]);
+        $client->executeCommand(sprintf("%s\r\n", base64_encode($client->getPassword())), [235]);
+    }
+}

vendor/symfony/mailer/Transport/Smtp/Auth/PlainAuthenticator.php

@@ -0,0 +1,35 @@
+<?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\Auth;
+
+use Symfony\Component\Mailer\Transport\Smtp\EsmtpTransport;
+
+/**
+ * Handles PLAIN authentication.
+ *
+ * @author Chris Corbyn
+ */
+class PlainAuthenticator implements AuthenticatorInterface
+{
+    public function getAuthKeyword(): string
+    {
+        return 'PLAIN';
+    }
+
+    /**
+     * @see https://www.ietf.org/rfc/rfc4954.txt
+     */
+    public function authenticate(EsmtpTransport $client): void
+    {
+        $client->executeCommand(sprintf("AUTH PLAIN %s\r\n", base64_encode($client->getUsername().\chr(0).$client->getUsername().\chr(0).$client->getPassword())), [235]);
+    }
+}

vendor/symfony/mailer/Transport/Smtp/Auth/XOAuth2Authenticator.php

@@ -0,0 +1,37 @@
+<?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\Auth;
+
+use Symfony\Component\Mailer\Transport\Smtp\EsmtpTransport;
+
+/**
+ * Handles XOAUTH2 authentication.
+ *
+ * @author xu.li<AthenaLightenedMyPath@gmail.com>
+ *
+ * @see https://developers.google.com/google-apps/gmail/xoauth2_protocol
+ */
+class XOAuth2Authenticator implements AuthenticatorInterface
+{
+    public function getAuthKeyword(): string
+    {
+        return 'XOAUTH2';
+    }
+
+    /**
+     * @see https://developers.google.com/google-apps/gmail/xoauth2_protocol#the_sasl_xoauth2_mechanism
+     */
+    public function authenticate(EsmtpTransport $client): void
+    {
+        $client->executeCommand('AUTH XOAUTH2 '.base64_encode('user='.$client->getUsername()."\1auth=Bearer ".$client->getPassword()."\1\1")."\r\n", [235]);
+    }
+}

vendor/symfony/mailer/Transport/Smtp/EsmtpTransport.php

@@ -0,0 +1,228 @@
+<?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\Exception\UnexpectedResponseException;
+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;
+        }
+
+        $code = null;
+        $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 (UnexpectedResponseException $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);
+    }
+}

vendor/symfony/mailer/Transport/Smtp/EsmtpTransportFactory.php

@@ -0,0 +1,78 @@
+<?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 Symfony\Component\Mailer\Transport\AbstractTransportFactory;
+use Symfony\Component\Mailer\Transport\Dsn;
+use Symfony\Component\Mailer\Transport\Smtp\Stream\SocketStream;
+use Symfony\Component\Mailer\Transport\TransportInterface;
+
+/**
+ * @author Konstantin Myakshin <molodchick@gmail.com>
+ */
+final class EsmtpTransportFactory extends AbstractTransportFactory
+{
+    public function create(Dsn $dsn): TransportInterface
+    {
+        $tls = 'smtps' === $dsn->getScheme() ? true : null;
+        $port = $dsn->getPort(0);
+        $host = $dsn->getHost();
+
+        $transport = new EsmtpTransport($host, $port, $tls, $this->dispatcher, $this->logger);
+
+        /** @var SocketStream $stream */
+        $stream = $transport->getStream();
+        $streamOptions = $stream->getStreamOptions();
+
+        if ('' !== $dsn->getOption('verify_peer') && !filter_var($dsn->getOption('verify_peer', true), \FILTER_VALIDATE_BOOL)) {
+            $streamOptions['ssl']['verify_peer'] = false;
+            $streamOptions['ssl']['verify_peer_name'] = false;
+        }
+
+        if (null !== $peerFingerprint = $dsn->getOption('peer_fingerprint')) {
+            $streamOptions['ssl']['peer_fingerprint'] = $peerFingerprint;
+        }
+
+        $stream->setStreamOptions($streamOptions);
+
+        if ($user = $dsn->getUser()) {
+            $transport->setUsername($user);
+        }
+
+        if ($password = $dsn->getPassword()) {
+            $transport->setPassword($password);
+        }
+
+        if (null !== ($localDomain = $dsn->getOption('local_domain'))) {
+            $transport->setLocalDomain($localDomain);
+        }
+
+        if (null !== ($maxPerSecond = $dsn->getOption('max_per_second'))) {
+            $transport->setMaxPerSecond((float) $maxPerSecond);
+        }
+
+        if (null !== ($restartThreshold = $dsn->getOption('restart_threshold'))) {
+            $transport->setRestartThreshold((int) $restartThreshold, (int) $dsn->getOption('restart_threshold_sleep', 0));
+        }
+
+        if (null !== ($pingThreshold = $dsn->getOption('ping_threshold'))) {
+            $transport->setPingThreshold((int) $pingThreshold);
+        }
+
+        return $transport;
+    }
+
+    protected function getSupportedSchemes(): array
+    {
+        return ['smtp', 'smtps'];
+    }
+}

vendor/symfony/mailer/Transport/Smtp/SmtpTransport.php

@@ -0,0 +1,392 @@
+<?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\Envelope;
+use Symfony\Component\Mailer\Exception\LogicException;
+use Symfony\Component\Mailer\Exception\TransportException;
+use Symfony\Component\Mailer\Exception\TransportExceptionInterface;
+use Symfony\Component\Mailer\Exception\UnexpectedResponseException;
+use Symfony\Component\Mailer\SentMessage;
+use Symfony\Component\Mailer\Transport\AbstractTransport;
+use Symfony\Component\Mailer\Transport\Smtp\Stream\AbstractStream;
+use Symfony\Component\Mailer\Transport\Smtp\Stream\SocketStream;
+use Symfony\Component\Mime\RawMessage;
+
+/**
+ * Sends emails over SMTP.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @author Chris Corbyn
+ */
+class SmtpTransport extends AbstractTransport
+{
+    private bool $started = false;
+    private int $restartThreshold = 100;
+    private int $restartThresholdSleep = 0;
+    private int $restartCounter = 0;
+    private int $pingThreshold = 100;
+    private float $lastMessageTime = 0;
+    private AbstractStream $stream;
+    private string $domain = '[127.0.0.1]';
+
+    public function __construct(?AbstractStream $stream = null, ?EventDispatcherInterface $dispatcher = null, ?LoggerInterface $logger = null)
+    {
+        parent::__construct($dispatcher, $logger);
+
+        $this->stream = $stream ?? new SocketStream();
+    }
+
+    public function getStream(): AbstractStream
+    {
+        return $this->stream;
+    }
+
+    /**
+     * Sets the maximum number of messages to send before re-starting the transport.
+     *
+     * By default, the threshold is set to 100 (and no sleep at restart).
+     *
+     * @param int $threshold The maximum number of messages (0 to disable)
+     * @param int $sleep     The number of seconds to sleep between stopping and re-starting the transport
+     *
+     * @return $this
+     */
+    public function setRestartThreshold(int $threshold, int $sleep = 0): static
+    {
+        $this->restartThreshold = $threshold;
+        $this->restartThresholdSleep = $sleep;
+
+        return $this;
+    }
+
+    /**
+     * Sets the minimum number of seconds required between two messages, before the server is pinged.
+     * If the transport wants to send a message and the time since the last message exceeds the specified threshold,
+     * the transport will ping the server first (NOOP command) to check if the connection is still alive.
+     * Otherwise the message will be sent without pinging the server first.
+     *
+     * Do not set the threshold too low, as the SMTP server may drop the connection if there are too many
+     * non-mail commands (like pinging the server with NOOP).
+     *
+     * By default, the threshold is set to 100 seconds.
+     *
+     * @param int $seconds The minimum number of seconds between two messages required to ping the server
+     *
+     * @return $this
+     */
+    public function setPingThreshold(int $seconds): static
+    {
+        $this->pingThreshold = $seconds;
+
+        return $this;
+    }
+
+    /**
+     * Sets the name of the local domain that will be used in HELO.
+     *
+     * This should be a fully-qualified domain name and should be truly the domain
+     * you're using.
+     *
+     * If your server does not have a domain name, use the IP address. This will
+     * automatically be wrapped in square brackets as described in RFC 5321,
+     * section 4.1.3.
+     *
+     * @return $this
+     */
+    public function setLocalDomain(string $domain): static
+    {
+        if ('' !== $domain && '[' !== $domain[0]) {
+            if (filter_var($domain, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV4)) {
+                $domain = '['.$domain.']';
+            } elseif (filter_var($domain, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV6)) {
+                $domain = '[IPv6:'.$domain.']';
+            }
+        }
+
+        $this->domain = $domain;
+
+        return $this;
+    }
+
+    /**
+     * Gets the name of the domain that will be used in HELO.
+     *
+     * If an IP address was specified, this will be returned wrapped in square
+     * brackets as described in RFC 5321, section 4.1.3.
+     */
+    public function getLocalDomain(): string
+    {
+        return $this->domain;
+    }
+
+    public function send(RawMessage $message, ?Envelope $envelope = null): ?SentMessage
+    {
+        try {
+            $message = parent::send($message, $envelope);
+        } catch (TransportExceptionInterface $e) {
+            if ($this->started) {
+                try {
+                    $this->executeCommand("RSET\r\n", [250]);
+                } catch (TransportExceptionInterface) {
+                    // ignore this exception as it probably means that the server error was final
+                }
+            }
+
+            throw $e;
+        }
+
+        $this->checkRestartThreshold();
+
+        return $message;
+    }
+
+    protected function parseMessageId(string $mtaResult): string
+    {
+        $regexps = [
+            '/250 Ok (?P<id>[0-9a-f-]+)\r?$/mis',
+            '/250 Ok:? queued as (?P<id>[A-Z0-9]+)\r?$/mis',
+        ];
+        $matches = [];
+        foreach ($regexps as $regexp) {
+            if (preg_match($regexp, $mtaResult, $matches)) {
+                return $matches['id'];
+            }
+        }
+
+        return '';
+    }
+
+    public function __toString(): string
+    {
+        if ($this->stream instanceof SocketStream) {
+            $name = sprintf('smtp%s://%s', ($tls = $this->stream->isTLS()) ? 's' : '', $this->stream->getHost());
+            $port = $this->stream->getPort();
+            if (!(25 === $port || ($tls && 465 === $port))) {
+                $name .= ':'.$port;
+            }
+
+            return $name;
+        }
+
+        return 'smtp://sendmail';
+    }
+
+    /**
+     * Runs a command against the stream, expecting the given response codes.
+     *
+     * @param int[] $codes
+     *
+     * @throws TransportException when an invalid response if received
+     */
+    public function executeCommand(string $command, array $codes): string
+    {
+        $this->stream->write($command);
+        $response = $this->getFullResponse();
+        $this->assertResponseCode($response, $codes);
+
+        return $response;
+    }
+
+    protected function doSend(SentMessage $message): void
+    {
+        if (microtime(true) - $this->lastMessageTime > $this->pingThreshold) {
+            $this->ping();
+        }
+
+        if (!$this->started) {
+            $this->start();
+        }
+
+        try {
+            $envelope = $message->getEnvelope();
+            $this->doMailFromCommand($envelope->getSender()->getEncodedAddress());
+            foreach ($envelope->getRecipients() as $recipient) {
+                $this->doRcptToCommand($recipient->getEncodedAddress());
+            }
+
+            $this->executeCommand("DATA\r\n", [354]);
+            try {
+                foreach (AbstractStream::replace("\r\n.", "\r\n..", $message->toIterable()) as $chunk) {
+                    $this->stream->write($chunk, false);
+                }
+                $this->stream->flush();
+            } catch (TransportExceptionInterface $e) {
+                throw $e;
+            } catch (\Exception $e) {
+                $this->stream->terminate();
+                $this->started = false;
+                $this->getLogger()->debug(sprintf('Email transport "%s" stopped', __CLASS__));
+                throw $e;
+            }
+            $mtaResult = $this->executeCommand("\r\n.\r\n", [250]);
+            $message->appendDebug($this->stream->getDebug());
+            $this->lastMessageTime = microtime(true);
+
+            if ($mtaResult && $messageId = $this->parseMessageId($mtaResult)) {
+                $message->setMessageId($messageId);
+            }
+        } catch (TransportExceptionInterface $e) {
+            $e->appendDebug($this->stream->getDebug());
+            $this->lastMessageTime = 0;
+            throw $e;
+        }
+    }
+
+    /**
+     * @internal since version 6.1, to be made private in 7.0
+     *
+     * @final since version 6.1, to be made private in 7.0
+     */
+    protected function doHeloCommand(): void
+    {
+        $this->executeCommand(sprintf("HELO %s\r\n", $this->domain), [250]);
+    }
+
+    private function doMailFromCommand(string $address): void
+    {
+        $this->executeCommand(sprintf("MAIL FROM:<%s>\r\n", $address), [250]);
+    }
+
+    private function doRcptToCommand(string $address): void
+    {
+        $this->executeCommand(sprintf("RCPT TO:<%s>\r\n", $address), [250, 251, 252]);
+    }
+
+    public function start(): void
+    {
+        if ($this->started) {
+            return;
+        }
+
+        $this->getLogger()->debug(sprintf('Email transport "%s" starting', __CLASS__));
+
+        $this->stream->initialize();
+        $this->assertResponseCode($this->getFullResponse(), [220]);
+        $this->doHeloCommand();
+        $this->started = true;
+        $this->lastMessageTime = 0;
+
+        $this->getLogger()->debug(sprintf('Email transport "%s" started', __CLASS__));
+    }
+
+    /**
+     * Manually disconnect from the SMTP server.
+     *
+     * In most cases this is not necessary since the disconnect happens automatically on termination.
+     * In cases of long-running scripts, this might however make sense to avoid keeping an open
+     * connection to the SMTP server in between sending emails.
+     */
+    public function stop(): void
+    {
+        if (!$this->started) {
+            return;
+        }
+
+        $this->getLogger()->debug(sprintf('Email transport "%s" stopping', __CLASS__));
+
+        try {
+            $this->executeCommand("QUIT\r\n", [221]);
+        } catch (TransportExceptionInterface) {
+        } finally {
+            $this->stream->terminate();
+            $this->started = false;
+            $this->getLogger()->debug(sprintf('Email transport "%s" stopped', __CLASS__));
+        }
+    }
+
+    private function ping(): void
+    {
+        if (!$this->started) {
+            return;
+        }
+
+        try {
+            $this->executeCommand("NOOP\r\n", [250]);
+        } catch (TransportExceptionInterface) {
+            $this->stop();
+        }
+    }
+
+    /**
+     * @throws TransportException if a response code is incorrect
+     */
+    private function assertResponseCode(string $response, array $codes): void
+    {
+        if (!$codes) {
+            throw new LogicException('You must set the expected response code.');
+        }
+
+        [$code] = sscanf($response, '%3d');
+        $valid = \in_array($code, $codes);
+
+        if (!$valid || !$response) {
+            $codeStr = $code ? sprintf('code "%s"', $code) : 'empty code';
+            $responseStr = $response ? sprintf(', with message "%s"', trim($response)) : '';
+
+            throw new UnexpectedResponseException(sprintf('Expected response code "%s" but got ', implode('/', $codes)).$codeStr.$responseStr.'.', $code ?: 0);
+        }
+    }
+
+    private function getFullResponse(): string
+    {
+        $response = '';
+        do {
+            $line = $this->stream->readLine();
+            $response .= $line;
+        } while ($line && isset($line[3]) && ' ' !== $line[3]);
+
+        return $response;
+    }
+
+    private function checkRestartThreshold(): void
+    {
+        // when using sendmail via non-interactive mode, the transport is never "started"
+        if (!$this->started) {
+            return;
+        }
+
+        ++$this->restartCounter;
+        if ($this->restartCounter < $this->restartThreshold) {
+            return;
+        }
+
+        $this->stop();
+        if (0 < $sleep = $this->restartThresholdSleep) {
+            $this->getLogger()->debug(sprintf('Email transport "%s" sleeps for %d seconds after stopping', __CLASS__, $sleep));
+
+            sleep($sleep);
+        }
+        $this->start();
+        $this->restartCounter = 0;
+    }
+
+    public function __sleep(): array
+    {
+        throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
+    }
+
+    /**
+     * @return void
+     */
+    public function __wakeup()
+    {
+        throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
+    }
+
+    public function __destruct()
+    {
+        $this->stop();
+    }
+}

vendor/symfony/mailer/Transport/Smtp/Stream/AbstractStream.php

@@ -0,0 +1,145 @@
+<?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\Stream;
+
+use Symfony\Component\Mailer\Exception\TransportException;
+
+/**
+ * A stream supporting remote sockets and local processes.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @author Nicolas Grekas <p@tchwork.com>
+ * @author Chris Corbyn
+ *
+ * @internal
+ */
+abstract class AbstractStream
+{
+    /** @var resource|null */
+    protected $stream;
+    /** @var resource|null */
+    protected $in;
+    /** @var resource|null */
+    protected $out;
+    protected $err;
+
+    private string $debug = '';
+
+    public function write(string $bytes, bool $debug = true): void
+    {
+        if ($debug) {
+            foreach (explode("\n", trim($bytes)) as $line) {
+                $this->debug .= sprintf("> %s\n", $line);
+            }
+        }
+
+        $bytesToWrite = \strlen($bytes);
+        $totalBytesWritten = 0;
+        while ($totalBytesWritten < $bytesToWrite) {
+            $bytesWritten = @fwrite($this->in, substr($bytes, $totalBytesWritten));
+            if (false === $bytesWritten || 0 === $bytesWritten) {
+                throw new TransportException('Unable to write bytes on the wire.');
+            }
+
+            $totalBytesWritten += $bytesWritten;
+        }
+    }
+
+    /**
+     * Flushes the contents of the stream (empty it) and set the internal pointer to the beginning.
+     */
+    public function flush(): void
+    {
+        fflush($this->in);
+    }
+
+    /**
+     * Performs any initialization needed.
+     */
+    abstract public function initialize(): void;
+
+    public function terminate(): void
+    {
+        $this->stream = $this->err = $this->out = $this->in = null;
+    }
+
+    public function readLine(): string
+    {
+        if (feof($this->out)) {
+            return '';
+        }
+
+        $line = @fgets($this->out);
+        if ('' === $line || false === $line) {
+            $metas = stream_get_meta_data($this->out);
+            if ($metas['timed_out']) {
+                throw new TransportException(sprintf('Connection to "%s" timed out.', $this->getReadConnectionDescription()));
+            }
+            if ($metas['eof']) {
+                throw new TransportException(sprintf('Connection to "%s" has been closed unexpectedly.', $this->getReadConnectionDescription()));
+            }
+            if (false === $line) {
+                throw new TransportException(sprintf('Unable to read from connection to "%s": ', $this->getReadConnectionDescription()).error_get_last()['message']);
+            }
+        }
+
+        $this->debug .= sprintf('< %s', $line);
+
+        return $line;
+    }
+
+    public function getDebug(): string
+    {
+        $debug = $this->debug;
+        $this->debug = '';
+
+        return $debug;
+    }
+
+    public static function replace(string $from, string $to, iterable $chunks): \Generator
+    {
+        if ('' === $from) {
+            yield from $chunks;
+
+            return;
+        }
+
+        $carry = '';
+        $fromLen = \strlen($from);
+
+        foreach ($chunks as $chunk) {
+            if ('' === $chunk = $carry.$chunk) {
+                continue;
+            }
+
+            if (str_contains($chunk, $from)) {
+                $chunk = explode($from, $chunk);
+                $carry = array_pop($chunk);
+
+                yield implode($to, $chunk).$to;
+            } else {
+                $carry = $chunk;
+            }
+
+            if (\strlen($carry) > $fromLen) {
+                yield substr($carry, 0, -$fromLen);
+                $carry = substr($carry, -$fromLen);
+            }
+        }
+
+        if ('' !== $carry) {
+            yield $carry;
+        }
+    }
+
+    abstract protected function getReadConnectionDescription(): string;
+}

vendor/symfony/mailer/Transport/Smtp/Stream/ProcessStream.php

@@ -0,0 +1,71 @@
+<?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\Stream;
+
+use Symfony\Component\Mailer\Exception\TransportException;
+
+/**
+ * A stream supporting local processes.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @author Chris Corbyn
+ *
+ * @internal
+ */
+final class ProcessStream extends AbstractStream
+{
+    private string $command;
+
+    public function setCommand(string $command): void
+    {
+        $this->command = $command;
+    }
+
+    public function initialize(): void
+    {
+        $descriptorSpec = [
+            0 => ['pipe', 'r'],
+            1 => ['pipe', 'w'],
+            2 => ['pipe', '\\' === \DIRECTORY_SEPARATOR ? 'a' : 'w'],
+        ];
+        $pipes = [];
+        $this->stream = proc_open($this->command, $descriptorSpec, $pipes);
+        stream_set_blocking($pipes[2], false);
+        if ($err = stream_get_contents($pipes[2])) {
+            throw new TransportException('Process could not be started: '.$err);
+        }
+        $this->in = &$pipes[0];
+        $this->out = &$pipes[1];
+        $this->err = &$pipes[2];
+    }
+
+    public function terminate(): void
+    {
+        if (null !== $this->stream) {
+            fclose($this->in);
+            $out = stream_get_contents($this->out);
+            fclose($this->out);
+            $err = stream_get_contents($this->err);
+            fclose($this->err);
+            if (0 !== $exitCode = proc_close($this->stream)) {
+                throw new TransportException('Process failed with exit code '.$exitCode.': '.$out.$err);
+            }
+        }
+
+        parent::terminate();
+    }
+
+    protected function getReadConnectionDescription(): string
+    {
+        return 'process '.$this->command;
+    }
+}

vendor/symfony/mailer/Transport/Smtp/Stream/SocketStream.php

@@ -0,0 +1,193 @@
+<?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\Stream;
+
+use Symfony\Component\Mailer\Exception\TransportException;
+
+/**
+ * A stream supporting remote sockets.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @author Chris Corbyn
+ *
+ * @internal
+ */
+final class SocketStream extends AbstractStream
+{
+    private string $url;
+    private string $host = 'localhost';
+    private int $port = 465;
+    private float $timeout;
+    private bool $tls = true;
+    private ?string $sourceIp = null;
+    private array $streamContextOptions = [];
+
+    /**
+     * @return $this
+     */
+    public function setTimeout(float $timeout): static
+    {
+        $this->timeout = $timeout;
+
+        return $this;
+    }
+
+    public function getTimeout(): float
+    {
+        return $this->timeout ?? (float) \ini_get('default_socket_timeout');
+    }
+
+    /**
+     * Literal IPv6 addresses should be wrapped in square brackets.
+     *
+     * @return $this
+     */
+    public function setHost(string $host): static
+    {
+        $this->host = $host;
+
+        return $this;
+    }
+
+    public function getHost(): string
+    {
+        return $this->host;
+    }
+
+    /**
+     * @return $this
+     */
+    public function setPort(int $port): static
+    {
+        $this->port = $port;
+
+        return $this;
+    }
+
+    public function getPort(): int
+    {
+        return $this->port;
+    }
+
+    /**
+     * Sets the TLS/SSL on the socket (disables STARTTLS).
+     *
+     * @return $this
+     */
+    public function disableTls(): static
+    {
+        $this->tls = false;
+
+        return $this;
+    }
+
+    public function isTLS(): bool
+    {
+        return $this->tls;
+    }
+
+    /**
+     * @return $this
+     */
+    public function setStreamOptions(array $options): static
+    {
+        $this->streamContextOptions = $options;
+
+        return $this;
+    }
+
+    public function getStreamOptions(): array
+    {
+        return $this->streamContextOptions;
+    }
+
+    /**
+     * Sets the source IP.
+     *
+     * IPv6 addresses should be wrapped in square brackets.
+     *
+     * @return $this
+     */
+    public function setSourceIp(string $ip): static
+    {
+        $this->sourceIp = $ip;
+
+        return $this;
+    }
+
+    /**
+     * Returns the IP used to connect to the destination.
+     */
+    public function getSourceIp(): ?string
+    {
+        return $this->sourceIp;
+    }
+
+    public function initialize(): void
+    {
+        $this->url = $this->host.':'.$this->port;
+        if ($this->tls) {
+            $this->url = 'ssl://'.$this->url;
+        }
+        $options = [];
+        if ($this->sourceIp) {
+            $options['socket']['bindto'] = $this->sourceIp.':0';
+        }
+        if ($this->streamContextOptions) {
+            $options = array_merge($options, $this->streamContextOptions);
+        }
+        // do it unconditionally as it will be used by STARTTLS as well if supported
+        $options['ssl']['crypto_method'] ??= \STREAM_CRYPTO_METHOD_TLS_CLIENT | \STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT | \STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT;
+        $streamContext = stream_context_create($options);
+
+        $timeout = $this->getTimeout();
+        set_error_handler(function ($type, $msg) {
+            throw new TransportException(sprintf('Connection could not be established with host "%s": ', $this->url).$msg);
+        });
+        try {
+            $this->stream = stream_socket_client($this->url, $errno, $errstr, $timeout, \STREAM_CLIENT_CONNECT, $streamContext);
+        } finally {
+            restore_error_handler();
+        }
+
+        stream_set_blocking($this->stream, true);
+        stream_set_timeout($this->stream, (int) $timeout, (int) (($timeout - (int) $timeout) * 1000000));
+        $this->in = &$this->stream;
+        $this->out = &$this->stream;
+    }
+
+    public function startTLS(): bool
+    {
+        set_error_handler(function ($type, $msg) {
+            throw new TransportException('Unable to connect with STARTTLS: '.$msg);
+        });
+        try {
+            return stream_socket_enable_crypto($this->stream, true);
+        } finally {
+            restore_error_handler();
+        }
+    }
+
+    public function terminate(): void
+    {
+        if (null !== $this->stream) {
+            fclose($this->stream);
+        }
+
+        parent::terminate();
+    }
+
+    protected function getReadConnectionDescription(): string
+    {
+        return $this->url;
+    }
+}