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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.
*/
/**
* Makes sure a connection to a POP3 host has been established prior to connecting to SMTP.
*
* @author Chris Corbyn
*/
class Swift_Plugins_PopBeforeSmtpPlugin implements Swift_Events_TransportChangeListener, Swift_Plugins_Pop_Pop3Connection
{
/** A delegate connection to use (mostly a test hook) */
private $_connection;
/** Hostname of the POP3 server */
private $_host;
/** Port number to connect on */
private $_port;
/** Encryption type to use (if any) */
private $_crypto;
/** Username to use (if any) */
private $_username;
/** Password to use (if any) */
private $_password;
/** Established connection via TCP socket */
private $_socket;
/** Connect timeout in seconds */
private $_timeout = 10;
/** SMTP Transport to bind to */
private $_transport;
/**
* Create a new PopBeforeSmtpPlugin for $host and $port.
*
* @param string $host
* @param int $port
* @param string $crypto as "tls" or "ssl"
*/
public function __construct($host, $port = 110, $crypto = null)
{
$this->_host = $host;
$this->_port = $port;
$this->_crypto = $crypto;
}
/**
* Create a new PopBeforeSmtpPlugin for $host and $port.
*
* @param string $host
* @param int $port
* @param string $crypto as "tls" or "ssl"
*
* @return Swift_Plugins_PopBeforeSmtpPlugin
*/
public static function newInstance($host, $port = 110, $crypto = null)
{
return new self($host, $port, $crypto);
}
/**
* Set a Pop3Connection to delegate to instead of connecting directly.
*
* @param Swift_Plugins_Pop_Pop3Connection $connection
*
* @return Swift_Plugins_PopBeforeSmtpPlugin
*/
public function setConnection(Swift_Plugins_Pop_Pop3Connection $connection)
{
$this->_connection = $connection;
return $this;
}
/**
* Bind this plugin to a specific SMTP transport instance.
*
* @param Swift_Transport
*/
public function bindSmtp(Swift_Transport $smtp)
{
$this->_transport = $smtp;
}
/**
* Set the connection timeout in seconds (default 10).
*
* @param int $timeout
*
* @return Swift_Plugins_PopBeforeSmtpPlugin
*/
public function setTimeout($timeout)
{
$this->_timeout = (int) $timeout;
return $this;
}
/**
* Set the username to use when connecting (if needed).
*
* @param string $username
*
* @return Swift_Plugins_PopBeforeSmtpPlugin
*/
public function setUsername($username)
{
$this->_username = $username;
return $this;
}
/**
* Set the password to use when connecting (if needed).
*
* @param string $password
*
* @return Swift_Plugins_PopBeforeSmtpPlugin
*/
public function setPassword($password)
{
$this->_password = $password;
return $this;
}
/**
* Connect to the POP3 host and authenticate.
*
* @throws Swift_Plugins_Pop_Pop3Exception if connection fails
*/
public function connect()
{
if (isset($this->_connection)) {
$this->_connection->connect();
} else {
if (!isset($this->_socket)) {
if (!$socket = fsockopen(
$this->_getHostString(), $this->_port, $errno, $errstr, $this->_timeout))
{
throw new Swift_Plugins_Pop_Pop3Exception(
sprintf('Failed to connect to POP3 host [%s]: %s', $this->_host, $errstr)
);
}
$this->_socket = $socket;
if (false === $greeting = fgets($this->_socket)) {
throw new Swift_Plugins_Pop_Pop3Exception(
sprintf('Failed to connect to POP3 host [%s]', trim($greeting))
);
}
$this->_assertOk($greeting);
if ($this->_username) {
$this->_command(sprintf("USER %s\r\n", $this->_username));
$this->_command(sprintf("PASS %s\r\n", $this->_password));
}
}
}
}
/**
* Disconnect from the POP3 host.
*/
public function disconnect()
{
if (isset($this->_connection)) {
$this->_connection->disconnect();
} else {
$this->_command("QUIT\r\n");
if (!fclose($this->_socket)) {
throw new Swift_Plugins_Pop_Pop3Exception(
sprintf('POP3 host [%s] connection could not be stopped', $this->_host)
);
}
$this->_socket = null;
}
}
/**
* Invoked just before a Transport is started.
*
* @param Swift_Events_TransportChangeEvent $evt
*/
public function beforeTransportStarted(Swift_Events_TransportChangeEvent $evt)
{
if (isset($this->_transport)) {
if ($this->_transport !== $evt->getTransport()) {
return;
}
}
$this->connect();
$this->disconnect();
}
/**
* Not used.
*/
public function transportStarted(Swift_Events_TransportChangeEvent $evt)
{
}
/**
* Not used.
*/
public function beforeTransportStopped(Swift_Events_TransportChangeEvent $evt)
{
}
/**
* Not used.
*/
public function transportStopped(Swift_Events_TransportChangeEvent $evt)
{
}
private function _command($command)
{
if (!fwrite($this->_socket, $command)) {
throw new Swift_Plugins_Pop_Pop3Exception(
sprintf('Failed to write command [%s] to POP3 host', trim($command))
);
}
if (false === $response = fgets($this->_socket)) {
throw new Swift_Plugins_Pop_Pop3Exception(
sprintf('Failed to read from POP3 host after command [%s]', trim($command))
);
}
$this->_assertOk($response);
return $response;
}
private function _assertOk($response)
{
if (substr($response, 0, 3) != '+OK') {
throw new Swift_Plugins_Pop_Pop3Exception(
sprintf('POP3 command failed [%s]', trim($response))
);
}
}
private function _getHostString()
{
$host = $this->_host;
switch (strtolower($this->_crypto)) {
case 'ssl':
$host = 'ssl://' . $host;
break;
case 'tls':
$host = 'tls://' . $host;
break;
}
return $host;
}
}
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