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<?php
/*
* This file is part of SwiftMailer.
* (c) 2004-2009 Chris Corbyn
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
/**
* Sends Messages over SMTP with ESMTP support.
*
* @author Chris Corbyn
*/
class Swift_Transport_EsmtpTransport extends Swift_Transport_AbstractSmtpTransport implements Swift_Transport_SmtpAgent
{
/**
* ESMTP extension handlers.
*
* @var Swift_Transport_EsmtpHandler[]
*/
private $handlers = [];
/**
* ESMTP capabilities.
*
* @var string[]
*/
private $capabilities = [];
/**
* Connection buffer parameters.
*
* @var array
*/
private $params = [
'protocol' => 'tcp',
'host' => 'localhost',
'port' => 25,
'timeout' => 30,
'blocking' => 1,
'tls' => false,
'type' => Swift_Transport_IoBuffer::TYPE_SOCKET,
'stream_context_options' => [],
];
/**
* Creates a new EsmtpTransport using the given I/O buffer.
*
* @param Swift_Transport_EsmtpHandler[] $extensionHandlers
* @param string $localDomain
*/
public function __construct(Swift_Transport_IoBuffer $buf, array $extensionHandlers, Swift_Events_EventDispatcher $dispatcher, $localDomain = '127.0.0.1', Swift_AddressEncoder $addressEncoder = null)
{
parent::__construct($buf, $dispatcher, $localDomain, $addressEncoder);
$this->setExtensionHandlers($extensionHandlers);
}
/**
* Set the host to connect to.
*
* Literal IPv6 addresses should be wrapped in square brackets.
*
* @param string $host
*
* @return $this
*/
public function setHost($host)
{
$this->params['host'] = $host;
return $this;
}
/**
* Get the host to connect to.
*
* @return string
*/
public function getHost()
{
return $this->params['host'];
}
/**
* Set the port to connect to.
*
* @param int $port
*
* @return $this
*/
public function setPort($port)
{
$this->params['port'] = (int) $port;
return $this;
}
/**
* Get the port to connect to.
*
* @return int
*/
public function getPort()
{
return $this->params['port'];
}
/**
* Set the connection timeout.
*
* @param int $timeout seconds
*
* @return $this
*/
public function setTimeout($timeout)
{
$this->params['timeout'] = (int) $timeout;
$this->buffer->setParam('timeout', (int) $timeout);
return $this;
}
/**
* Get the connection timeout.
*
* @return int
*/
public function getTimeout()
{
return $this->params['timeout'];
}
/**
* Set the encryption type (tls or ssl).
*
* @param string $encryption
*
* @return $this
*/
public function setEncryption($encryption)
{
$encryption = strtolower($encryption ?? '');
if ('tls' == $encryption) {
$this->params['protocol'] = 'tcp';
$this->params['tls'] = true;
} else {
$this->params['protocol'] = $encryption;
$this->params['tls'] = false;
}
return $this;
}
/**
* Get the encryption type.
*
* @return string
*/
public function getEncryption()
{
return $this->params['tls'] ? 'tls' : $this->params['protocol'];
}
/**
* Sets the stream context options.
*
* @param array $options
*
* @return $this
*/
public function setStreamOptions($options)
{
$this->params['stream_context_options'] = $options;
return $this;
}
/**
* Returns the stream context options.
*
* @return array
*/
public function getStreamOptions()
{
return $this->params['stream_context_options'];
}
/**
* Sets the source IP.
*
* IPv6 addresses should be wrapped in square brackets.
*
* @param string $source
*
* @return $this
*/
public function setSourceIp($source)
{
$this->params['sourceIp'] = $source;
return $this;
}
/**
* Returns the IP used to connect to the destination.
*
* @return string
*/
public function getSourceIp()
{
return $this->params['sourceIp'] ?? null;
}
/**
* Sets whether SMTP pipelining is enabled.
*
* By default, support is auto-detected using the PIPELINING SMTP extension.
* Use this function to override that in the unlikely event of compatibility
* issues.
*
* @param bool $enabled
*
* @return $this
*/
public function setPipelining($enabled)
{
$this->pipelining = $enabled;
return $this;
}
/**
* Returns whether SMTP pipelining is enabled.
*
* @return bool|null a boolean if pipelining is explicitly enabled or disabled,
* or null if support is auto-detected
*/
public function getPipelining()
{
return $this->pipelining;
}
/**
* Set ESMTP extension handlers.
*
* @param Swift_Transport_EsmtpHandler[] $handlers
*
* @return $this
*/
public function setExtensionHandlers(array $handlers)
{
$assoc = [];
foreach ($handlers as $handler) {
$assoc[$handler->getHandledKeyword()] = $handler;
}
uasort($assoc, function ($a, $b) {
return $a->getPriorityOver($b->getHandledKeyword());
});
$this->handlers = $assoc;
$this->setHandlerParams();
return $this;
}
/**
* Get ESMTP extension handlers.
*
* @return Swift_Transport_EsmtpHandler[]
*/
public function getExtensionHandlers()
{
return array_values($this->handlers);
}
/**
* Run a command against the buffer, expecting the given response codes.
*
* If no response codes are given, the response will not be validated.
* If codes are given, an exception will be thrown on an invalid response.
*
* @param string $command
* @param int[] $codes
* @param string[] $failures An array of failures by-reference
* @param bool $pipeline Do not wait for response
* @param string $address the address, if command is RCPT TO
*
* @return string|null The server response, or null if pipelining is enabled
*/
public function executeCommand($command, $codes = [], &$failures = null, $pipeline = false, $address = null)
{
$failures = (array) $failures;
$stopSignal = false;
$response = null;
foreach ($this->getActiveHandlers() as $handler) {
$response = $handler->onCommand(
$this, $command, $codes, $failures, $stopSignal
);
if ($stopSignal) {
return $response;
}
}
return parent::executeCommand($command, $codes, $failures, $pipeline, $address);
}
/** Mixin handling method for ESMTP handlers */
public function __call($method, $args)
{
foreach ($this->handlers as $handler) {
if (\in_array(strtolower($method),
array_map('strtolower', (array) $handler->exposeMixinMethods())
)) {
$return = \call_user_func_array([$handler, $method], $args);
// Allow fluid method calls
if (null === $return && 'set' == substr($method, 0, 3)) {
return $this;
} else {
return $return;
}
}
}
trigger_error('Call to undefined method '.$method, E_USER_ERROR);
}
/** Get the params to initialize the buffer */
protected function getBufferParams()
{
return $this->params;
}
/** Overridden to perform EHLO instead */
protected function doHeloCommand()
{
try {
$response = $this->executeCommand(
sprintf("EHLO %s\r\n", $this->domain), [250]
);
} catch (Swift_TransportException $e) {
return parent::doHeloCommand();
}
if ($this->params['tls']) {
try {
$this->executeCommand("STARTTLS\r\n", [220]);
if (!$this->buffer->startTLS()) {
throw new Swift_TransportException('Unable to connect with TLS encryption');
}
try {
$response = $this->executeCommand(
sprintf("EHLO %s\r\n", $this->domain), [250]
);
} catch (Swift_TransportException $e) {
return parent::doHeloCommand();
}
} catch (Swift_TransportException $e) {
$this->throwException($e);
}
}
$this->capabilities = $this->getCapabilities($response);
if (!isset($this->pipelining)) {
$this->pipelining = isset($this->capabilities['PIPELINING']);
}
$this->setHandlerParams();
foreach ($this->getActiveHandlers() as $handler) {
$handler->afterEhlo($this);
}
}
/** Overridden to add Extension support */
protected function doMailFromCommand($address)
{
$address = $this->addressEncoder->encodeString($address);
$handlers = $this->getActiveHandlers();
$params = [];
foreach ($handlers as $handler) {
$params = array_merge($params, (array) $handler->getMailParams());
}
$paramStr = !empty($params) ? ' '.implode(' ', $params) : '';
$this->executeCommand(
sprintf("MAIL FROM:<%s>%s\r\n", $address, $paramStr), [250], $failures, true
);
}
/** Overridden to add Extension support */
protected function doRcptToCommand($address)
{
$address = $this->addressEncoder->encodeString($address);
$handlers = $this->getActiveHandlers();
$params = [];
foreach ($handlers as $handler) {
$params = array_merge($params, (array) $handler->getRcptParams());
}
$paramStr = !empty($params) ? ' '.implode(' ', $params) : '';
$this->executeCommand(
sprintf("RCPT TO:<%s>%s\r\n", $address, $paramStr), [250, 251, 252], $failures, true, $address
);
}
/** Determine ESMTP capabilities by function group */
private function getCapabilities($ehloResponse)
{
$capabilities = [];
$ehloResponse = trim($ehloResponse ?? '');
$lines = explode("\r\n", $ehloResponse);
array_shift($lines);
foreach ($lines as $line) {
if (preg_match('/^[0-9]{3}[ -]([A-Z0-9-]+)((?:[ =].*)?)$/Di', $line, $matches)) {
$keyword = strtoupper($matches[1]);
$paramStr = strtoupper(ltrim($matches[2], ' ='));
$params = !empty($paramStr) ? explode(' ', $paramStr) : [];
$capabilities[$keyword] = $params;
}
}
return $capabilities;
}
/** Set parameters which are used by each extension handler */
private function setHandlerParams()
{
foreach ($this->handlers as $keyword => $handler) {
if (\array_key_exists($keyword, $this->capabilities)) {
$handler->setKeywordParams($this->capabilities[$keyword]);
}
}
}
/** Get ESMTP handlers which are currently ok to use */
private function getActiveHandlers()
{
$handlers = [];
foreach ($this->handlers as $keyword => $handler) {
if (\array_key_exists($keyword, $this->capabilities)) {
$handlers[] = $handler;
}
}
return $handlers;
}
}