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<?php

/**

 * PHPMailer POP-Before-SMTP Authentication Class.

 * PHP Version 5.5.

 *

 * @see       https://github.com/PHPMailer/PHPMailer/ The PHPMailer GitHub project

 *

 * @author    Marcus Bointon (Synchro/coolbru) <phpmailer@synchromedia.co.uk>

 * @author    Jim Jagielski (jimjag) <jimjag@gmail.com>

 * @author    Andy Prevost (codeworxtech) <codeworxtech@users.sourceforge.net>

 * @author    Brent R. Matzelle (original founder)

 * @copyright 2012 - 2017 Marcus Bointon

 * @copyright 2010 - 2012 Jim Jagielski

 * @copyright 2004 - 2009 Andy Prevost

 * @license   http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License

 * @note      This program is distributed in the hope that it will be useful - WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.

 */

namespace PHPMailer\PHPMailer;

/**

 * PHPMailer POP-Before-SMTP Authentication Class.

 * Specifically for PHPMailer to use for RFC1939 POP-before-SMTP authentication.

 * 1) This class does not support APOP authentication.

 * 2) Opening and closing lots of POP3 connections can be quite slow. If you need

 *   to send a batch of emails then just perform the authentication once at the start,

 *   and then loop through your mail sending script. Providing this process doesn't

 *   take longer than the verification period lasts on your POP3 server, you should be fine.

 * 3) This is really ancient technology; you should only need to use it to talk to very old systems.

 * 4) This POP3 class is deliberately lightweight and incomplete, and implements just

 *   enough to do authentication.

 *   If you want a more complete class there are other POP3 classes for PHP available.

 *

 * @author  Richard Davey (original author) <rich@corephp.co.uk>

 * @author  Marcus Bointon (Synchro/coolbru) <phpmailer@synchromedia.co.uk>

 * @author  Jim Jagielski (jimjag) <jimjag@gmail.com>

 * @author  Andy Prevost (codeworxtech) <codeworxtech@users.sourceforge.net>

 */

class POP3

{

    /**

     * The POP3 PHPMailer Version number.

     *

     * @var string

     */

    const VERSION = '6.0.7';

    /**

     * Default POP3 port number.

     *

     * @var int

     */

    const DEFAULT_PORT = 110;

    /**

     * Default timeout in seconds.

     *

     * @var int

     */

    const DEFAULT_TIMEOUT = 30;

    /**

     * Debug display level.

     * Options: 0 = no, 1+ = yes.

     *

     * @var int

     */

    public $do_debug = 0;

    /**

     * POP3 mail server hostname.

     *

     * @var string

     */

    public $host;

    /**

     * POP3 port number.

     *

     * @var int

     */

    public $port;

    /**

     * POP3 Timeout Value in seconds.

     *

     * @var int

     */

    public $tval;

    /**

     * POP3 username.

     *

     * @var string

     */

    public $username;

    /**

     * POP3 password.

     *

     * @var string

     */

    public $password;

    /**

     * Resource handle for the POP3 connection socket.

     *

     * @var resource

     */

    protected $pop_conn;

    /**

     * Are we connected?

     *

     * @var bool

     */

    protected $connected = false;

    /**

     * Error container.

     *

     * @var array

     */

    protected $errors = [];

    /**

     * Line break constant.

     */

    const LE = "\r\n";

    /**

     * Simple static wrapper for all-in-one POP before SMTP.

     *

     * @param string   $host        The hostname to connect to

     * @param int|bool $port        The port number to connect to

     * @param int|bool $timeout     The timeout value

     * @param string   $username

     * @param string   $password

     * @param int      $debug_level

     *

     * @return bool

     */

    public static function popBeforeSmtp(

        $host,

        $port = false,

        $timeout = false,

        $username = '',

        $password = '',

        $debug_level = 0

    ) {

        $pop = new self();

        return $pop->authorise($host, $port, $timeout, $username, $password, $debug_level);

    }

    /**

     * Authenticate with a POP3 server.

     * A connect, login, disconnect sequence

     * appropriate for POP-before SMTP authorisation.

     *

     * @param string   $host        The hostname to connect to

     * @param int|bool $port        The port number to connect to

     * @param int|bool $timeout     The timeout value

     * @param string   $username

     * @param string   $password

     * @param int      $debug_level

     *

     * @return bool

     */

    public function authorise($host, $port = false, $timeout = false, $username = '', $password = '', $debug_level = 0)

    {

        $this->host = $host;

        // If no port value provided, use default

        if (false === $port) {

            $this->port = static::DEFAULT_PORT;

        } else {

            $this->port = (int) $port;

        }

        // If no timeout value provided, use default

        if (false === $timeout) {

            $this->tval = static::DEFAULT_TIMEOUT;

        } else {

            $this->tval = (int) $timeout;

        }

        $this->do_debug = $debug_level;

        $this->username = $username;

        $this->password = $password;

        //  Reset the error log

        $this->errors = [];

        //  connect

        $result = $this->connect($this->host, $this->port, $this->tval);

        if ($result) {

            $login_result = $this->login($this->username, $this->password);

            if ($login_result) {

                $this->disconnect();

                return true;

            }

        }

        // We need to disconnect regardless of whether the login succeeded

        $this->disconnect();

        return false;

    }

    /**

     * Connect to a POP3 server.

     *

     * @param string   $host

     * @param int|bool $port

     * @param int      $tval

     *

     * @return bool

     */

    public function connect($host, $port = false, $tval = 30)

    {

        //  Are we already connected?

        if ($this->connected) {

            return true;

        }

        //On Windows this will raise a PHP Warning error if the hostname doesn't exist.

        //Rather than suppress it with @fsockopen, capture it cleanly instead

        set_error_handler([$this, 'catchWarning']);

        if (false === $port) {

            $port = static::DEFAULT_PORT;

        }

        //  connect to the POP3 server

        $this->pop_conn = fsockopen(

            $host, //  POP3 Host

            $port, //  Port #

            $errno, //  Error Number

            $errstr, //  Error Message

            $tval

        ); //  Timeout (seconds)

        //  Restore the error handler

        restore_error_handler();

        //  Did we connect?

        if (false === $this->pop_conn) {

            //  It would appear not...

            $this->setError(

                "Failed to connect to server $host on port $port. errno: $errno; errstr: $errstr"

            );

            return false;

        }

        //  Increase the stream time-out

        stream_set_timeout($this->pop_conn, $tval, 0);

        //  Get the POP3 server response

        $pop3_response = $this->getResponse();

        //  Check for the +OK

        if ($this->checkResponse($pop3_response)) {

            //  The connection is established and the POP3 server is talking

            $this->connected = true;

            return true;

        }

        return false;

    }

    /**

     * Log in to the POP3 server.

     * Does not support APOP (RFC 2828, 4949).

     *

     * @param string $username

     * @param string $password

     *

     * @return bool

     */

    public function login($username = '', $password = '')

    {

        if (!$this->connected) {

            $this->setError('Not connected to POP3 server');

        }

        if (empty($username)) {

            $username = $this->username;

        }

        if (empty($password)) {

            $password = $this->password;

        }

        // Send the Username

        $this->sendString("USER $username" . static::LE);

        $pop3_response = $this->getResponse();

        if ($this->checkResponse($pop3_response)) {

            // Send the Password

            $this->sendString("PASS $password" . static::LE);

            $pop3_response = $this->getResponse();

            if ($this->checkResponse($pop3_response)) {

                return true;

            }

        }

        return false;

    }

    /**

     * Disconnect from the POP3 server.

     */

    public function disconnect()

    {

        $this->sendString('QUIT');

        //The QUIT command may cause the daemon to exit, which will kill our connection

        //So ignore errors here

        try {

            @fclose($this->pop_conn);

        } catch (Exception $e) {

            //Do nothing

        }

    }

    /**

     * Get a response from the POP3 server.

     *

     * @param int $size The maximum number of bytes to retrieve

     *

     * @return string

     */

    protected function getResponse($size = 128)

    {

        $response = fgets($this->pop_conn, $size);

        if ($this->do_debug >= 1) {

            echo 'Server -> Client: ', $response;

        }

        return $response;

    }

    /**

     * Send raw data to the POP3 server.

     *

     * @param string $string

     *

     * @return int

     */

    protected function sendString($string)

    {

        if ($this->pop_conn) {

            if ($this->do_debug >= 2) { //Show client messages when debug >= 2

                echo 'Client -> Server: ', $string;

            }

            return fwrite($this->pop_conn, $string, strlen($string));

        }

        return 0;

    }

    /**

     * Checks the POP3 server response.

     * Looks for for +OK or -ERR.

     *

     * @param string $string

     *

     * @return bool

     */

    protected function checkResponse($string)

    {

        if (substr($string, 0, 3) !== '+OK') {

            $this->setError("Server reported an error: $string");

            return false;

        }

        return true;

    }

    /**

     * Add an error to the internal error store.

     * Also display debug output if it's enabled.

     *

     * @param string $error

     */

    protected function setError($error)

    {

        $this->errors[] = $error;

        if ($this->do_debug >= 1) {

            echo '<pre>';

            foreach ($this->errors as $e) {

                print_r($e);

            }

            echo '</pre>';

        }

    }

    /**

     * Get an array of error messages, if any.

     *

     * @return array

     */

    public function getErrors()

    {

        return $this->errors;

    }

    /**

     * POP3 connection error handler.

     *

     * @param int    $errno

     * @param string $errstr

     * @param string $errfile

     * @param int    $errline

     */

    protected function catchWarning($errno, $errstr, $errfile, $errline)

    {

        $this->setError(

            'Connecting to the POP3 server raised a PHP warning:' .

            "errno: $errno errstr: $errstr; errfile: $errfile; errline: $errline"

        );

    }

}