<?php

/**

 * Zend Framework

 *

 * LICENSE

 *

 * This source file is subject to the new BSD license that is bundled

 * with this package in the file LICENSE.txt.

 * It is also available through the world-wide-web at this URL:

 * http://framework.zend.com/license/new-bsd

 * If you did not receive a copy of the license and are unable to

 * obtain it through the world-wide-web, please send an email

 * to license@zend.com so we can send you a copy immediately.

 *

 * @category   Zend

 * @package    Zend_Mail

 * @subpackage Protocol

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 * @version    $Id: Smtp.php 20096 2010-01-06 02:05:09Z bkarwin $

 */

/**

 * @see Zend_Mime

 */

require_once 'Zend/Mime.php';

/**

 * @see Zend_Mail_Protocol_Abstract

 */

require_once 'Zend/Mail/Protocol/Abstract.php';

/**

 * Smtp implementation of Zend_Mail_Protocol_Abstract

 *

 * Minimum implementation according to RFC2821: EHLO, MAIL FROM, RCPT TO, DATA, RSET, NOOP, QUIT

 *

 * @category   Zend

 * @package    Zend_Mail

 * @subpackage Protocol

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

class Zend_Mail_Protocol_Smtp extends Zend_Mail_Protocol_Abstract

{

    /**

     * The transport method for the socket

     *

     * @var string

     */

    protected $_transport = 'tcp';

    /**

     * Indicates that a session is requested to be secure

     *

     * @var string

     */

    protected $_secure;

    /**

     * Indicates an smtp session has been started by the HELO command

     *

     * @var boolean

     */

    protected $_sess = false;

    /**

     * Indicates the HELO command has been issues

     *

     * @var unknown_type

     */

    protected $_helo = false;

    /**

     * Indicates an smtp AUTH has been issued and authenticated

     *

     * @var unknown_type

     */

    protected $_auth = false;

    /**

     * Indicates a MAIL command has been issued

     *

     * @var unknown_type

     */

    protected $_mail = false;

    /**

     * Indicates one or more RCTP commands have been issued

     *

     * @var unknown_type

     */

    protected $_rcpt = false;

    /**

     * Indicates that DATA has been issued and sent

     *

     * @var unknown_type

     */

    protected $_data = null;

    /**

     * Constructor.

     *

     * @param  string  $host

     * @param  integer $port

     * @param  array   $config

     * @return void

     * @throws Zend_Mail_Protocol_Exception

     */

    public function __construct($host = '127.0.0.1', $port = null, array $config = array())

    {

        if (isset($config['ssl'])) {

            switch (strtolower($config['ssl'])) {

                case 'tls':

                    $this->_secure = 'tls';

                    break;

                case 'ssl':

                    $this->_transport = 'ssl';

                    $this->_secure = 'ssl';

                    if ($port == null) {

                        $port = 465;

                    }

                    break;

                default:

                    /**

                     * @see Zend_Mail_Protocol_Exception

                     */

                    require_once 'Zend/Mail/Protocol/Exception.php';

                    throw new Zend_Mail_Protocol_Exception($config['ssl'] . ' is unsupported SSL type');

                    break;

            }

        }

        // If no port has been specified then check the master PHP ini file. Defaults to 25 if the ini setting is null.

        if ($port == null) {

            if (($port = ini_get('smtp_port')) == '') {

                $port = 25;

            }

        }

        parent::__construct($host, $port);

    }

    /**

     * Connect to the server with the parameters given in the constructor.

     *

     * @return boolean

     */

    public function connect()

    {

        return $this->_connect($this->_transport . '://' . $this->_host . ':'. $this->_port);

    }

    /**

     * Initiate HELO/EHLO sequence and set flag to indicate valid smtp session

     *

     * @param  string $host The client hostname or IP address (default: 127.0.0.1)

     * @throws Zend_Mail_Protocol_Exception

     * @return void

     */

    public function helo($host = '127.0.0.1')

    {

        // Respect RFC 2821 and disallow HELO attempts if session is already initiated.

        if ($this->_sess === true) {

            /**

             * @see Zend_Mail_Protocol_Exception

             */

            require_once 'Zend/Mail/Protocol/Exception.php';

            throw new Zend_Mail_Protocol_Exception('Cannot issue HELO to existing session');

        }

        // Validate client hostname

        if (!$this->_validHost->isValid($host)) {

            /**

             * @see Zend_Mail_Protocol_Exception

             */

            require_once 'Zend/Mail/Protocol/Exception.php';

            throw new Zend_Mail_Protocol_Exception(join(', ', $this->_validHost->getMessages()));

        }

        // Initiate helo sequence

        $this->_expect(220, 300); // Timeout set for 5 minutes as per RFC 2821 4.5.3.2

        $this->_ehlo($host);

        // If a TLS session is required, commence negotiation

        if ($this->_secure == 'tls') {

            $this->_send('STARTTLS');

            $this->_expect(220, 180);

            if (!stream_socket_enable_crypto($this->_socket, true, STREAM_CRYPTO_METHOD_TLS_CLIENT)) {

                /**

                 * @see Zend_Mail_Protocol_Exception

                 */

                require_once 'Zend/Mail/Protocol/Exception.php';

                throw new Zend_Mail_Protocol_Exception('Unable to connect via TLS');

            }

            $this->_ehlo($host);

        }

        $this->_startSession();

        $this->auth();

    }

    /**

     * Send EHLO or HELO depending on capabilities of smtp host

     *

     * @param  string $host The client hostname or IP address (default: 127.0.0.1)

     * @throws Zend_Mail_Protocol_Exception

     * @return void

     */

    protected function _ehlo($host)

    {

        // Support for older, less-compliant remote servers. Tries multiple attempts of EHLO or HELO.

        try {

            $this->_send('EHLO ' . $host);

            $this->_expect(250, 300); // Timeout set for 5 minutes as per RFC 2821 4.5.3.2

        } catch (Zend_Mail_Protocol_Exception $e) {

            $this->_send('HELO ' . $host);

            $this->_expect(250, 300); // Timeout set for 5 minutes as per RFC 2821 4.5.3.2

        } catch (Zend_Mail_Protocol_Exception $e) {

            throw $e;

        }

    }

    /**

     * Issues MAIL command

     *

     * @param  string $from Sender mailbox

     * @throws Zend_Mail_Protocol_Exception

     * @return void

     */

    public function mail($from)

    {

        if ($this->_sess !== true) {

            /**

             * @see Zend_Mail_Protocol_Exception

             */

            require_once 'Zend/Mail/Protocol/Exception.php';

            throw new Zend_Mail_Protocol_Exception('A valid session has not been started');

        }

        $this->_send('MAIL FROM:<' . $from . '>');

        $this->_expect(250, 300); // Timeout set for 5 minutes as per RFC 2821 4.5.3.2

        // Set mail to true, clear recipients and any existing data flags as per 4.1.1.2 of RFC 2821

        $this->_mail = true;

        $this->_rcpt = false;

        $this->_data = false;

    }

    /**

     * Issues RCPT command

     *

     * @param  string $to Receiver(s) mailbox

     * @throws Zend_Mail_Protocol_Exception

     * @return void

     */

    public function rcpt($to)

    {

        if ($this->_mail !== true) {

            /**

             * @see Zend_Mail_Protocol_Exception

             */

            require_once 'Zend/Mail/Protocol/Exception.php';

            throw new Zend_Mail_Protocol_Exception('No sender reverse path has been supplied');

        }

        // Set rcpt to true, as per 4.1.1.3 of RFC 2821

        $this->_send('RCPT TO:<' . $to . '>');

        $this->_expect(array(250, 251), 300); // Timeout set for 5 minutes as per RFC 2821 4.5.3.2

        $this->_rcpt = true;

    }

    /**

     * Issues DATA command

     *

     * @param  string $data

     * @throws Zend_Mail_Protocol_Exception

     * @return void

     */

    public function data($data)

    {

        // Ensure recipients have been set

        if ($this->_rcpt !== true) {

            /**

             * @see Zend_Mail_Protocol_Exception

             */

            require_once 'Zend/Mail/Protocol/Exception.php';

            throw new Zend_Mail_Protocol_Exception('No recipient forward path has been supplied');

        }

        $this->_send('DATA');

        $this->_expect(354, 120); // Timeout set for 2 minutes as per RFC 2821 4.5.3.2

        foreach (explode(Zend_Mime::LINEEND, $data) as $line) {

            if (strpos($line, '.') === 0) {

                // Escape lines prefixed with a '.'

                $line = '.' . $line;

            }

            $this->_send($line);

        }

        $this->_send('.');

        $this->_expect(250, 600); // Timeout set for 10 minutes as per RFC 2821 4.5.3.2

        $this->_data = true;

    }

    /**

     * Issues the RSET command end validates answer

     *

     * Can be used to restore a clean smtp communication state when a transaction has been cancelled or commencing a new transaction.

     *

     * @return void

     */

    public function rset()

    {

        $this->_send('RSET');

        // MS ESMTP doesn't follow RFC, see [ZF-1377]

        $this->_expect(array(250, 220));

        $this->_mail = false;

        $this->_rcpt = false;

        $this->_data = false;

    }

    /**

     * Issues the NOOP command end validates answer

     *

     * Not used by Zend_Mail, could be used to keep a connection alive or check if it is still open.

     *

     * @return void

     */

    public function noop()

    {

        $this->_send('NOOP');

        $this->_expect(250, 300); // Timeout set for 5 minutes as per RFC 2821 4.5.3.2

    }

    /**

     * Issues the VRFY command end validates answer

     *

     * Not used by Zend_Mail.

     *

     * @param  string $user User Name or eMail to verify

     * @return void

     */

    public function vrfy($user)

    {

        $this->_send('VRFY ' . $user);

        $this->_expect(array(250, 251, 252), 300); // Timeout set for 5 minutes as per RFC 2821 4.5.3.2

    }

    /**

     * Issues the QUIT command and clears the current session

     *

     * @return void

     */

    public function quit()

    {

        if ($this->_sess) {

            $this->_send('QUIT');

            $this->_expect(221, 300); // Timeout set for 5 minutes as per RFC 2821 4.5.3.2

            $this->_stopSession();

        }

    }

    /**

     * Default authentication method

     *

     * This default method is implemented by AUTH adapters to properly authenticate to a remote host.

     *

     * @throws Zend_Mail_Protocol_Exception

     * @return void

     */

    public function auth()

    {

        if ($this->_auth === true) {

            /**

             * @see Zend_Mail_Protocol_Exception

             */

            require_once 'Zend/Mail/Protocol/Exception.php';

            throw new Zend_Mail_Protocol_Exception('Already authenticated for this session');

        }

    }

    /**

     * Closes connection

     *

     * @return void

     */

    public function disconnect()

    {

        $this->_disconnect();

    }

    /**

     * Start mail session

     *

     * @return void

     */

    protected function _startSession()

    {

        $this->_sess = true;

    }

    /**

     * Stop mail session

     *

     * @return void

     */

    protected function _stopSession()

    {

        $this->_sess = false;

    }

}