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 <?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) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 
 /**
  * @category   Zend
  * @package    Zend_Mail
  * @subpackage Protocol
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Mail_Protocol_Pop3
 {
     /**
      * Default timeout in seconds for initiating session
      */
     const TIMEOUT_CONNECTION = 30;
 
     /**
      * saves if server supports top
      * @var null|bool
      */
     public $hasTop = null;
 
     /**
      * socket to pop3
      * @var null|resource
      */
     protected $_socket;
 
     /**
      * greeting timestamp for apop
      * @var null|string
      */
     protected $_timestamp;
 
 
     /**
      * Public constructor
      *
      * @param  string      $host  hostname or IP address of POP3 server, if given connect() is called
      * @param  int|null    $port  port of POP3 server, null for default (110 or 995 for ssl)
      * @param  bool|string $ssl   use ssl? 'SSL', 'TLS' or false
      * @throws Zend_Mail_Protocol_Exception
      */
     public function __construct($host = '', $port = null, $ssl = false)
     {
         if ($host) {
             $this->connect($host, $port, $ssl);
         }
     }
 
 
     /**
      * Public destructor
      */
     public function __destruct()
     {
         $this->logout();
     }
 
 
     /**
      * Open connection to POP3 server
      *
      * @param  string      $host  hostname or IP address of POP3 server
      * @param  int|null    $port  of POP3 server, default is 110 (995 for ssl)
      * @param  string|bool $ssl   use 'SSL', 'TLS' or false
      * @return string welcome message
      * @throws Zend_Mail_Protocol_Exception
      */
     public function connect($host, $port = null, $ssl = false)
     {
         if ($ssl == 'SSL') {
             $host = 'ssl://' . $host;
         }
 
         if ($port === null) {
             $port = $ssl == 'SSL' ? 995 : 110;
         }
 
         $errno  =  0;
         $errstr = '';
         $this->_socket = @fsockopen($host, $port, $errno, $errstr, self::TIMEOUT_CONNECTION);
         if (!$this->_socket) {
             /**
              * @see Zend_Mail_Protocol_Exception
              */
             // require_once 'Zend/Mail/Protocol/Exception.php';
             throw new Zend_Mail_Protocol_Exception('cannot connect to host; error = ' . $errstr .
                                                    ' (errno = ' . $errno . ' )');
         }
 
         $welcome = $this->readResponse();
 
         strtok($welcome, '<');
         $this->_timestamp = strtok('>');
         if (!strpos($this->_timestamp, '@')) {
             $this->_timestamp = null;
         } else {
             $this->_timestamp = '<' . $this->_timestamp . '>';
         }
 
         if ($ssl === 'TLS') {
             $this->request('STLS');
             $result = stream_socket_enable_crypto($this->_socket, true, STREAM_CRYPTO_METHOD_TLS_CLIENT);
             if (!$result) {
                 /**
                  * @see Zend_Mail_Protocol_Exception
                  */
                 // require_once 'Zend/Mail/Protocol/Exception.php';
                 throw new Zend_Mail_Protocol_Exception('cannot enable TLS');
             }
         }
 
         return $welcome;
     }
 
 
     /**
      * Send a request
      *
      * @param string $request your request without newline
      * @return null
      * @throws Zend_Mail_Protocol_Exception
      */
     public function sendRequest($request)
     {
         $result = @fputs($this->_socket, $request . "\r\n");
         if (!$result) {
             /**
              * @see Zend_Mail_Protocol_Exception
              */
             // require_once 'Zend/Mail/Protocol/Exception.php';
             throw new Zend_Mail_Protocol_Exception('send failed - connection closed?');
         }
     }
 
 
     /**
      * read a response
      *
      * @param  boolean $multiline response has multiple lines and should be read until "<nl>.<nl>"
      * @return string response
      * @throws Zend_Mail_Protocol_Exception
      */
     public function readResponse($multiline = false)
     {
         $result = @fgets($this->_socket);
         if (!is_string($result)) {
             /**
              * @see Zend_Mail_Protocol_Exception
              */
             // require_once 'Zend/Mail/Protocol/Exception.php';
             throw new Zend_Mail_Protocol_Exception('read failed - connection closed?');
         }
 
         $result = trim($result);
         if (strpos($result, ' ')) {
             list($status, $message) = explode(' ', $result, 2);
         } else {
             $status = $result;
             $message = '';
         }
 
         if ($status != '+OK') {
             /**
              * @see Zend_Mail_Protocol_Exception
              */
             // require_once 'Zend/Mail/Protocol/Exception.php';
             throw new Zend_Mail_Protocol_Exception('last request failed');
         }
 
         if ($multiline) {
             $message = '';
             $line = fgets($this->_socket);
             while ($line && rtrim($line, "\r\n") != '.') {
                 if ($line[0] == '.') {
                     $line = substr($line, 1);
                 }
                 $message .= $line;
                 $line = fgets($this->_socket);
             };
         }
 
         return $message;
     }
 
 
     /**
      * Send request and get resposne
      *
      * @see sendRequest(), readResponse()
      *
      * @param  string $request    request
      * @param  bool   $multiline  multiline response?
      * @return string             result from readResponse()
      * @throws Zend_Mail_Protocol_Exception
      */
     public function request($request, $multiline = false)
     {
         $this->sendRequest($request);
         return $this->readResponse($multiline);
     }
 
 
     /**
      * End communication with POP3 server (also closes socket)
      *
      * @return null
      */
     public function logout()
     {
         if (!$this->_socket) {
             return;
         }
 
         try {
             $this->request('QUIT');
         } catch (Zend_Mail_Protocol_Exception $e) {
             // ignore error - we're closing the socket anyway
         }
 
         fclose($this->_socket);
         $this->_socket = null;
     }
 
 
     /**
      * Get capabilities from POP3 server
      *
      * @return array list of capabilities
      * @throws Zend_Mail_Protocol_Exception
      */
     public function capa()
     {
         $result = $this->request('CAPA', true);
         return explode("\n", $result);
     }
 
 
     /**
      * Login to POP3 server. Can use APOP
      *
      * @param  string $user      username
      * @param  string $password  password
      * @param  bool   $try_apop  should APOP be tried?
      * @return void
      * @throws Zend_Mail_Protocol_Exception
      */
     public function login($user, $password, $tryApop = true)
     {
         if ($tryApop && $this->_timestamp) {
             try {
                 $this->request("APOP $user " . md5($this->_timestamp . $password));
                 return;
             } catch (Zend_Mail_Protocol_Exception $e) {
                 // ignore
             }
         }
 
         $result = $this->request("USER $user");
         $result = $this->request("PASS $password");
     }
 
 
     /**
      * Make STAT call for message count and size sum
      *
      * @param  int $messages  out parameter with count of messages
      * @param  int $octets    out parameter with size in octects of messages
      * @return void
      * @throws Zend_Mail_Protocol_Exception
      */
     public function status(&$messages, &$octets)
     {
         $messages = 0;
         $octets = 0;
         $result = $this->request('STAT');
 
         list($messages, $octets) = explode(' ', $result);
     }
 
 
     /**
      * Make LIST call for size of message(s)
      *
      * @param  int|null $msgno number of message, null for all
      * @return int|array size of given message or list with array(num => size)
      * @throws Zend_Mail_Protocol_Exception
      */
     public function getList($msgno = null)
     {
         if ($msgno !== null) {
             $result = $this->request("LIST $msgno");
 
             list(, $result) = explode(' ', $result);
             return (int)$result;
         }
 
         $result = $this->request('LIST', true);
         $messages = array();
         $line = strtok($result, "\n");
         while ($line) {
             list($no, $size) = explode(' ', trim($line));
             $messages[(int)$no] = (int)$size;
             $line = strtok("\n");
         }
 
         return $messages;
     }
 
 
     /**
      * Make UIDL call for getting a uniqueid
      *
      * @param  int|null $msgno number of message, null for all
      * @return string|array uniqueid of message or list with array(num => uniqueid)
      * @throws Zend_Mail_Protocol_Exception
      */
     public function uniqueid($msgno = null)
     {
         if ($msgno !== null) {
             $result = $this->request("UIDL $msgno");
 
             list(, $result) = explode(' ', $result);
             return $result;
         }
 
         $result = $this->request('UIDL', true);
 
         $result = explode("\n", $result);
         $messages = array();
         foreach ($result as $line) {
             if (!$line) {
                 continue;
             }
             list($no, $id) = explode(' ', trim($line), 2);
             $messages[(int)$no] = $id;
         }
 
         return $messages;
 
     }
 
 
     /**
      * Make TOP call for getting headers and maybe some body lines
      * This method also sets hasTop - before it it's not known if top is supported
      *
      * The fallback makes normale RETR call, which retrieves the whole message. Additional
      * lines are not removed.
      *
      * @param  int  $msgno    number of message
      * @param  int  $lines    number of wanted body lines (empty line is inserted after header lines)
      * @param  bool $fallback fallback with full retrieve if top is not supported
      * @return string message headers with wanted body lines
      * @throws Zend_Mail_Protocol_Exception
      */
     public function top($msgno, $lines = 0, $fallback = false)
     {
         if ($this->hasTop === false) {
             if ($fallback) {
                 return $this->retrieve($msgno);
             } else {
                 /**
                  * @see Zend_Mail_Protocol_Exception
                  */
                 // require_once 'Zend/Mail/Protocol/Exception.php';
                 throw new Zend_Mail_Protocol_Exception('top not supported and no fallback wanted');
             }
         }
         $this->hasTop = true;
 
         $lines = (!$lines || $lines < 1) ? 0 : (int)$lines;
 
         try {
             $result = $this->request("TOP $msgno $lines", true);
         } catch (Zend_Mail_Protocol_Exception $e) {
             $this->hasTop = false;
             if ($fallback) {
                 $result = $this->retrieve($msgno);
             } else {
                 throw $e;
             }
         }
 
         return $result;
     }
 
 
     /**
      * Make a RETR call for retrieving a full message with headers and body
      *
      * @deprecated since 1.1.0; this method has a typo - please use retrieve()
      * @param  int $msgno  message number
      * @return string message
      * @throws Zend_Mail_Protocol_Exception
      */
     public function retrive($msgno)
     {
         return $this->retrieve($msgno);
     }
 
 
     /**
      * Make a RETR call for retrieving a full message with headers and body
      *
      * @param  int $msgno  message number
      * @return string message
      * @throws Zend_Mail_Protocol_Exception
      */
     public function retrieve($msgno)
     {
         $result = $this->request("RETR $msgno", true);
         return $result;
     }
 
     /**
      * Make a NOOP call, maybe needed for keeping the server happy
      *
      * @return null
      * @throws Zend_Mail_Protocol_Exception
      */
     public function noop()
     {
         $this->request('NOOP');
     }
 
 
     /**
      * Make a DELE count to remove a message
      *
      * @return null
      * @throws Zend_Mail_Protocol_Exception
      */
     public function delete($msgno)
     {
         $this->request("DELE $msgno");
     }
 
 
     /**
      * Make RSET call, which rollbacks delete requests
      *
      * @return null
      * @throws Zend_Mail_Protocol_Exception
      */
     public function undelete()
     {
         $this->request('RSET');
     }
 }