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<?php
/*~ class.pop3.php
.---------------------------------------------------------------------------.
|  Software: PHPMailer - PHP email class                                    |
|   Version: 2.0.4                                                          |
|   Contact: via sourceforge.net support pages (also www.codeworxtech.com)  |
|      Info: http://phpmailer.sourceforge.net                               |
|   Support: http://sourceforge.net/projects/phpmailer/                     |
| ------------------------------------------------------------------------- |
|    Author: Andy Prevost (project admininistrator)                         |
|    Author: Brent R. Matzelle (original founder)                           |
| Copyright (c) 2004-2007, Andy Prevost. All Rights Reserved.               |
| Copyright (c) 2001-2003, Brent R. Matzelle                                |
| ------------------------------------------------------------------------- |
|   License: Distributed under the Lesser General Public License (LGPL)     |
|            http://www.gnu.org/copyleft/lesser.html                        |
| 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.                                         |
| ------------------------------------------------------------------------- |
| We offer a number of paid services (www.codeworxtech.com):                |
| - Web Hosting on highly optimized fast and secure servers                 |
| - Technology Consulting                                                   |
| - Oursourcing (highly qualified programmers and graphic designers)        |
'---------------------------------------------------------------------------'

/**
 * POP Before SMTP Authentication Class
 *
 * Author: Richard Davey (rich@corephp.co.uk)
 * License: LGPL, see PHPMailer License
 *
 * Specifically for PHPMailer to allow POP before SMTP authentication.
 * Does not yet work with APOP - if you have an APOP account, contact me
 * and we can test changes to this script.
 *
 * This class is based on the structure of the SMTP class by Chris Ryan
 *
 * This class is rfc 1939 compliant and implements all the commands
 * required for POP3 connection, authentication and disconnection.
 *
 * @package PHPMailer
 * @author Richard Davey
 */

class POP3
{
  /**
   * Default POP3 port
   * @var int
   */
  var $POP3_PORT = 110;

  /**
   * Default Timeout
   * @var int
   */
  var $POP3_TIMEOUT = 30;

  /**
   * POP3 Carriage Return + Line Feed
   * @var string
   */
  var $CRLF = "\r\n";

  /**
   * Displaying Debug warnings? (0 = now, 1+ = yes)
   * @var int
   */
  var $do_debug = 2;

  /**
   * POP3 Mail Server
   * @var string
   */
  var $host;

  /**
   * POP3 Port
   * @var int
   */
  var $port;

  /**
   * POP3 Timeout Value
   * @var int
   */
  var $tval;

  /**
   * POP3 Username
   * @var string
   */
  var $username;

  /**
   * POP3 Password
   * @var string
   */
  var $password;

  /**#@+
   * @access private
   */
  var $pop_conn;
  var $connected;
  var $error;     //  Error log array
  /**#@-*/

  /**
   * Constructor, sets the initial values
   *
   * @return POP3
   */
  function POP3 ()
    {
      $this->pop_conn = 0;
      $this->connected = false;
      $this->error = null;
    }

  /**
   * Combination of public events - connect, login, disconnect
   *
   * @param string $host
   * @param integer $port
   * @param integer $tval
   * @param string $username
   * @param string $password
   */
  function Authorise ($host, $port = false, $tval = false, $username, $password, $debug_level = 0)
  {
    $this->host = $host;

    //  If no port value is passed, retrieve it
    if ($port == false)
    {
      $this->port = $this->POP3_PORT;
    }
    else
    {
      $this->port = $port;
    }

    //  If no port value is passed, retrieve it
    if ($tval == false)
    {
      $this->tval = $this->POP3_TIMEOUT;
    }
    else
    {
      $this->tval = $tval;
    }

    $this->do_debug = $debug_level;
    $this->username = $username;
    $this->password = $password;

    //  Refresh the error log
      $this->error = null;

      //  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 if the login succeeded
    $this->Disconnect();

    return false;
  }

  /**
   * Connect to the POP3 server
   *
   * @param string $host
   * @param integer $port
   * @param integer $tval
   * @return boolean
   */
  function Connect ($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 supress it with @fsockopen, let's capture it cleanly instead
    */

    set_error_handler(array(&$this, 'catchWarning'));

    //  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();

    //  Does the Error Log now contain anything?
    if ($this->error && $this->do_debug >= 1)
    {
        $this->displayErrors();
    }

    //  Did we connect?
      if ($this->pop_conn == false)
      {
        //  It would appear not...
        $this->error = array(
          'error' => "Failed to connect to server $host on port $port",
          'errno' => $errno,
          'errstr' => $errstr
        );

        if ($this->do_debug >= 1)
        {
          $this->displayErrors();
        }

        return false;
      }

      //  Increase the stream time-out

      //  Check for PHP 4.3.0 or later
      if (version_compare(phpversion(), '4.3.0', 'ge'))
      {
        stream_set_timeout($this->pop_conn, $tval, 0);
      }
      else
      {
        //  Does not work on Windows
        if (substr(PHP_OS, 0, 3) !== 'WIN')
        {
          socket_set_timeout($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;
      }

    }

    /**
     * Login to the POP3 server (does not support APOP yet)
     *
     * @param string $username
     * @param string $password
     * @return boolean
     */
    function Login ($username = '', $password = '')
    {
      if ($this->connected == false)
      {
        $this->error = 'Not connected to POP3 server';

        if ($this->do_debug >= 1)
        {
          $this->displayErrors();
        }
      }

      if (empty($username))
      {
        $username = $this->username;
      }

      if (empty($password))
      {
        $password = $this->password;
      }

    $pop_username = "USER $username" . $this->CRLF;
    $pop_password = "PASS $password" . $this->CRLF;

      //  Send the Username
      $this->sendString($pop_username);
      $pop3_response = $this->getResponse();

      if ($this->checkResponse($pop3_response))
      {
        //  Send the Password
        $this->sendString($pop_password);
        $pop3_response = $this->getResponse();

        if ($this->checkResponse($pop3_response))
        {
          return true;
        }
        else
        {
          return false;
        }
      }
      else
      {
        return false;
      }
    }

    /**
     * Disconnect from the POP3 server
     */
    function Disconnect ()
    {
      $this->sendString('QUIT');

      fclose($this->pop_conn);
    }

    /*
      ---------------
      Private Methods
      ---------------
    */

    /**
     * Get the socket response back.
     * $size is the maximum number of bytes to retrieve
     *
     * @param integer $size
     * @return string
     */
    function getResponse ($size = 128)
    {
      $pop3_response = fgets($this->pop_conn, $size);

      return $pop3_response;
    }

    /**
     * Send a string down the open socket connection to the POP3 server
     *
     * @param string $string
     * @return integer
     */
    function sendString ($string)
    {
      $bytes_sent = fwrite($this->pop_conn, $string, strlen($string));

      return $bytes_sent;

    }

    /**
     * Checks the POP3 server response for +OK or -ERR
     *
     * @param string $string
     * @return boolean
     */
    function checkResponse ($string)
    {
      if (substr($string, 0, 3) !== '+OK')
      {
        $this->error = array(
          'error' => "Server reported an error: $string",
          'errno' => 0,
          'errstr' => ''
        );

        if ($this->do_debug >= 1)
        {
          $this->displayErrors();
        }

        return false;
      }
      else
      {
        return true;
      }

    }

    /**
     * If debug is enabled, display the error message array
     *
     */
    function displayErrors ()
    {
      echo '<pre>';

      foreach ($this->error as $single_error)
    {
        print_r($single_error);
    }

      echo '</pre>';
    }

  /**
   * Takes over from PHP for the socket warning handler
   *
   * @param integer $errno
   * @param string $errstr
   * @param string $errfile
   * @param integer $errline
   */
  function catchWarning ($errno, $errstr, $errfile, $errline)
  {
    $this->error[] = array(
      'error' => "Connecting to the POP3 server raised a PHP warning: ",
      'errno' => $errno,
      'errstr' => $errstr
    );
  }

  //  End of class
}
?>