<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP 5.1.6 or newer
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*
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* @package CodeIgniter
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* @author ExpressionEngine Dev Team
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* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
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* @license http://codeigniter.com/user_guide/license.html
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* @link http://codeigniter.com
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* @since Version 1.0
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* @filesource
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*/
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// ------------------------------------------------------------------------
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/**
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* Trackback Class
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*
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* Trackback Sending/Receiving Class
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*
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* @package CodeIgniter
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* @subpackage Libraries
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* @category Trackbacks
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* @author ExpressionEngine Dev Team
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* @link http://codeigniter.com/user_guide/libraries/trackback.html
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*/
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class CI_Trackback {
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var $time_format = 'local';
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var $charset = 'UTF-8';
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var $data = array('url' => '', 'title' => '', 'excerpt' => '', 'blog_name' => '', 'charset' => '');
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var $convert_ascii = TRUE;
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var $response = '';
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var $error_msg = array();
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/**
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* Constructor
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*
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* @access public
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*/
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public function __construct()
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{
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log_message('debug', "Trackback Class Initialized");
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}
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// --------------------------------------------------------------------
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/**
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* Send Trackback
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*
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* @access public
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* @param array
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* @return bool
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*/
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function send($tb_data)
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{
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if ( ! is_array($tb_data))
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{
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$this->set_error('The send() method must be passed an array');
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return FALSE;
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}
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// Pre-process the Trackback Data
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foreach (array('url', 'title', 'excerpt', 'blog_name', 'ping_url') as $item)
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{
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if ( ! isset($tb_data[$item]))
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{
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$this->set_error('Required item missing: '.$item);
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return FALSE;
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}
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switch ($item)
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{
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case 'ping_url' : $$item = $this->extract_urls($tb_data[$item]);
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break;
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case 'excerpt' : $$item = $this->limit_characters($this->convert_xml(strip_tags(stripslashes($tb_data[$item]))));
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break;
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case 'url' : $$item = str_replace('-', '-', $this->convert_xml(strip_tags(stripslashes($tb_data[$item]))));
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break;
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default : $$item = $this->convert_xml(strip_tags(stripslashes($tb_data[$item])));
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break;
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}
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// Convert High ASCII Characters
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if ($this->convert_ascii == TRUE)
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{
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if ($item == 'excerpt')
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{
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$$item = $this->convert_ascii($$item);
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}
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elseif ($item == 'title')
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{
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$$item = $this->convert_ascii($$item);
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}
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elseif ($item == 'blog_name')
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{
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$$item = $this->convert_ascii($$item);
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}
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}
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}
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// Build the Trackback data string
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$charset = ( ! isset($tb_data['charset'])) ? $this->charset : $tb_data['charset'];
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$data = "url=".rawurlencode($url)."&title=".rawurlencode($title)."&blog_name=".rawurlencode($blog_name)."&excerpt=".rawurlencode($excerpt)."&charset=".rawurlencode($charset);
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// Send Trackback(s)
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$return = TRUE;
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if (count($ping_url) > 0)
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{
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foreach ($ping_url as $url)
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{
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if ($this->process($url, $data) == FALSE)
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{
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$return = FALSE;
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}
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}
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}
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return $return;
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}
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// --------------------------------------------------------------------
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/**
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* Receive Trackback Data
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*
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* This function simply validates the incoming TB data.
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* It returns FALSE on failure and TRUE on success.
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* If the data is valid it is set to the $this->data array
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* so that it can be inserted into a database.
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*
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* @access public
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* @return bool
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*/
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function receive()
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{
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foreach (array('url', 'title', 'blog_name', 'excerpt') as $val)
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{
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if ( ! isset($_POST[$val]) OR $_POST[$val] == '')
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{
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$this->set_error('The following required POST variable is missing: '.$val);
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return FALSE;
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}
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$this->data['charset'] = ( ! isset($_POST['charset'])) ? 'auto' : strtoupper(trim($_POST['charset']));
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if ($val != 'url' && function_exists('mb_convert_encoding'))
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{
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$_POST[$val] = mb_convert_encoding($_POST[$val], $this->charset, $this->data['charset']);
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}
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$_POST[$val] = ($val != 'url') ? $this->convert_xml(strip_tags($_POST[$val])) : strip_tags($_POST[$val]);
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if ($val == 'excerpt')
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{
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$_POST['excerpt'] = $this->limit_characters($_POST['excerpt']);
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}
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$this->data[$val] = $_POST[$val];
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}
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Send Trackback Error Message
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*
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* Allows custom errors to be set. By default it
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* sends the "incomplete information" error, as that's
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* the most common one.
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*
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* @access public
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* @param string
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* @return void
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*/
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function send_error($message = 'Incomplete Information')
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{
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echo "<?xml version=\"1.0\" encoding=\"utf-8\"?".">\n<response>\n<error>1</error>\n<message>".$message."</message>\n</response>";
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exit;
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}
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// --------------------------------------------------------------------
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/**
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* Send Trackback Success Message
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*
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* This should be called when a trackback has been
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* successfully received and inserted.
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*
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* @access public
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* @return void
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*/
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function send_success()
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{
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echo "<?xml version=\"1.0\" encoding=\"utf-8\"?".">\n<response>\n<error>0</error>\n</response>";
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exit;
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}
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// --------------------------------------------------------------------
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/**
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* Fetch a particular item
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*
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* @access public
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* @param string
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* @return string
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*/
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function data($item)
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{
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return ( ! isset($this->data[$item])) ? '' : $this->data[$item];
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}
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// --------------------------------------------------------------------
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/**
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* Process Trackback
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*
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* Opens a socket connection and passes the data to
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* the server. Returns TRUE on success, FALSE on failure
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*
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* @access public
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* @param string
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* @param string
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* @return bool
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*/
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function process($url, $data)
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{
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$target = parse_url($url);
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// Open the socket
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if ( ! $fp = @fsockopen($target['host'], 80))
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{
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$this->set_error('Invalid Connection: '.$url);
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return FALSE;
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}
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// Build the path
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$ppath = ( ! isset($target['path'])) ? $url : $target['path'];
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$path = (isset($target['query']) && $target['query'] != "") ? $ppath.'?'.$target['query'] : $ppath;
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// Add the Trackback ID to the data string
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if ($id = $this->get_id($url))
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{
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$data = "tb_id=".$id."&".$data;
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}
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// Transfer the data
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fputs ($fp, "POST " . $path . " HTTP/1.0\r\n" );
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fputs ($fp, "Host: " . $target['host'] . "\r\n" );
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fputs ($fp, "Content-type: application/x-www-form-urlencoded\r\n" );
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fputs ($fp, "Content-length: " . strlen($data) . "\r\n" );
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fputs ($fp, "Connection: close\r\n\r\n" );
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fputs ($fp, $data);
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// Was it successful?
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$this->response = "";
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while ( ! feof($fp))
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{
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$this->response .= fgets($fp, 128);
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}
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@fclose($fp);
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if (stristr($this->response, '<error>0</error>') === FALSE)
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{
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$message = 'An unknown error was encountered';
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if (preg_match("/<message>(.*?)<\/message>/is", $this->response, $match))
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{
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$message = trim($match['1']);
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}
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$this->set_error($message);
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return FALSE;
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}
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Extract Trackback URLs
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*
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* This function lets multiple trackbacks be sent.
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* It takes a string of URLs (separated by comma or
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* space) and puts each URL into an array
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*
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* @access public
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* @param string
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* @return string
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*/
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function extract_urls($urls)
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{
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// Remove the pesky white space and replace with a comma.
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$urls = preg_replace("/\s*(\S+)\s*/", "\\1,", $urls);
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// If they use commas get rid of the doubles.
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$urls = str_replace(",,", ",", $urls);
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// Remove any comma that might be at the end
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if (substr($urls, -1) == ",")
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{
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$urls = substr($urls, 0, -1);
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}
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// Break into an array via commas
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$urls = preg_split('/[,]/', $urls);
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// Removes duplicates
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$urls = array_unique($urls);
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array_walk($urls, array($this, 'validate_url'));
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return $urls;
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}
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// --------------------------------------------------------------------
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/**
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* Validate URL
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*
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* Simply adds "http://" if missing
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*
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* @access public
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* @param string
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* @return string
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*/
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function validate_url($url)
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{
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$url = trim($url);
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if (substr($url, 0, 4) != "http")
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{
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$url = "http://".$url;
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}
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}
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// --------------------------------------------------------------------
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/**
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* Find the Trackback URL's ID
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*
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* @access public
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* @param string
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* @return string
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*/
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function get_id($url)
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{
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$tb_id = "";
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if (strpos($url, '?') !== FALSE)
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{
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$tb_array = explode('/', $url);
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$tb_end = $tb_array[count($tb_array)-1];
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if ( ! is_numeric($tb_end))
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{
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$tb_end = $tb_array[count($tb_array)-2];
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}
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$tb_array = explode('=', $tb_end);
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$tb_id = $tb_array[count($tb_array)-1];
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}
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else
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{
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$url = rtrim($url, '/');
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$tb_array = explode('/', $url);
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$tb_id = $tb_array[count($tb_array)-1];
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if ( ! is_numeric($tb_id))
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{
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$tb_id = $tb_array[count($tb_array)-2];
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}
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}
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if ( ! preg_match ("/^([0-9]+)$/", $tb_id))
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{
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return FALSE;
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}
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else
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{
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return $tb_id;
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}
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}
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// --------------------------------------------------------------------
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/**
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* Convert Reserved XML characters to Entities
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*
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* @access public
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* @param string
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* @return string
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*/
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function convert_xml($str)
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{
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$temp = '__TEMP_AMPERSANDS__';
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$str = preg_replace("/&#(\d+);/", "$temp\\1;", $str);
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$str = preg_replace("/&(\w+);/", "$temp\\1;", $str);
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$str = str_replace(array("&","<",">","\"", "'", "-"),
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array("&", "<", ">", """, "'", "-"),
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$str);
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$str = preg_replace("/$temp(\d+);/","&#\\1;",$str);
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$str = preg_replace("/$temp(\w+);/","&\\1;", $str);
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return $str;
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}
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// --------------------------------------------------------------------
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/**
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* Character limiter
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*
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* Limits the string based on the character count. Will preserve complete words.
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*
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* @access public
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* @param string
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* @param integer
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* @param string
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* @return string
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*/
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function limit_characters($str, $n = 500, $end_char = '…')
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{
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if (strlen($str) < $n)
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{
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return $str;
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}
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$str = preg_replace("/\s+/", ' ', str_replace(array("\r\n", "\r", "\n"), ' ', $str));
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if (strlen($str) <= $n)
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{
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return $str;
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}
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$out = "";
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foreach (explode(' ', trim($str)) as $val)
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{
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$out .= $val.' ';
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if (strlen($out) >= $n)
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{
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return trim($out).$end_char;
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}
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}
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}
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// --------------------------------------------------------------------
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/**
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* High ASCII to Entities
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*
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* Converts Hight ascii text and MS Word special chars
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* to character entities
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*
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* @access public
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* @param string
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* @return string
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*/
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function convert_ascii($str)
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{
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$count = 1;
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$out = '';
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$temp = array();
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for ($i = 0, $s = strlen($str); $i < $s; $i++)
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{
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$ordinal = ord($str[$i]);
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if ($ordinal < 128)
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{
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$out .= $str[$i];
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}
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else
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{
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if (count($temp) == 0)
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{
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$count = ($ordinal < 224) ? 2 : 3;
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}
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$temp[] = $ordinal;
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if (count($temp) == $count)
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{
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$number = ($count == 3) ? (($temp['0'] % 16) * 4096) + (($temp['1'] % 64) * 64) + ($temp['2'] % 64) : (($temp['0'] % 32) * 64) + ($temp['1'] % 64);
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$out .= '&#'.$number.';';
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$count = 1;
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$temp = array();
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}
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}
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}
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return $out;
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}
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// --------------------------------------------------------------------
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/**
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* Set error message
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*
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* @access public
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* @param string
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* @return void
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*/
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function set_error($msg)
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{
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log_message('error', $msg);
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$this->error_msg[] = $msg;
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}
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// --------------------------------------------------------------------
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/**
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* Show error messages
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*
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* @access public
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* @param string
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* @param string
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* @return string
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*/
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function display_errors($open = '<p>', $close = '</p>')
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{
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$str = '';
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foreach ($this->error_msg as $val)
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{
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$str .= $open.$val.$close;
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}
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return $str;
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}
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}
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// END Trackback Class
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/* End of file Trackback.php */
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/* Location: ./system/libraries/Trackback.php */
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