<?php
$dn = dirname(__FILE__);
require_once $dn.'/mtfetcher_Class.php';
require_once 'PEAR.php';

/**
 * Class of System controller
 * 
 * Use this class under GPL license
 * @author   Eugene Panin <hide@address.com>, Lubertsy, Russia, 2004
 * @home http://www.tortuga.pp.ru/index.php/processor/index/lang/en
 * @package  mtfetcher
 * @depends PEAR (http://pear.php.net)
 * @version  1.0
 */
class mtfetcher_Fetcher extends mtfetcher_Class {

  /**
   * Transport object
   *
   * @var      object mtfetcher_Transport
   * @access   private
   */
  var $_tr;

  /**
   * Selects transport
   *
   * @param string $trName Name of concrete transport
   * @param array $trConf Configuration of transport
   * @return void
   * @throws object mtfetcher_Error
   * @access public
   */
  function selectTransport($trName,$trConf) {
    $err = $this->_includeFile('mtfetcher_Transport');
    if (PEAR::isError($err)) return $err;

    $this->_tr = mtfetcher_Transport::factory($trName,$trConf);
    if (PEAR::isError($this->_tr)) return $this->_tr;
  } // selectTransport

  /**
   * Returns META-tags of indicated web page
   *
   * @param string $url URL of web page
   * @return array Hash of META-tags
   * Keys:
   * title : string - Title of the web page
   * description : string - Description of the web page
   * keywords : string - Keywords of the web page
   * @throws object mtfetcher_Error
   * @access public
   */
  function getTags($url) {
    if (!is_a($this->_tr,'mtfetcher_Transport')) return new mtfetcher_NoTransportCreated_Error(' No transport selected');
    // Getting web page from URL
    $page = $this->_tr->getPage($url);
    if (PEAR::isError($page)) return $page;
    // Parsing tags from fetched page
    return $this->_parseTags($page);
  } // getTags

  /**
   * Parses web page and extracts META-tags
   *
   * @param string $page Web page
   * @return array Hash of META-tags
   * Keys:
   * title : string - Title of the web page
   * description : string - Description of the web page
   * keywords : string - Keywords of the web page
   * @throws object mtfetcher_Error
   * @access private
   */
  function _parseTags($page) {
    $title = $description = $keywords = '';
    if (preg_match('/<title>(.*)<\/title>/i',$page,$ar)) $title = $ar[1];
    if (preg_match('/<meta name="description" content="(.*)"/i',$page,$ar)) $description = $ar[1];
    if (preg_match('/<meta name="keywords" content="(.*)"/i',$page,$ar)) $keywords = $ar[1];
    $res = array(
		 'title'=>$title,
		 'description'=>$description,
		 'keywords'=>$keywords,
		 );
    return $res;
  } // _parseTags

} // class
?>