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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');/*** CodeIgniter** An open source application development framework for PHP 4.3.2 or newer** @package CodeIgniter* @author ExpressionEngine Dev Team* @copyright Copyright (c) 2008, EllisLab, Inc.* @license http://codeigniter.com/user_guide/license.html* @link http://codeigniter.com* @since Version 1.0* @filesource*/// ------------------------------------------------------------------------/*** Trackback Class** Trackback Sending/Receiving Class** @package CodeIgniter* @subpackage Libraries* @category Trackbacks* @author ExpressionEngine Dev Team* @link http://codeigniter.com/user_guide/libraries/trackback.html*/class CI_Trackback {var $time_format = 'local';var $charset = 'UTF-8';var $data = array('url' => '', 'title' => '', 'excerpt' => '', 'blog_name' => '', 'charset' => '');var $convert_ascii = TRUE;var $response = '';var $error_msg = array();/*** Constructor** @access public*/function CI_Trackback(){log_message('debug', "Trackback Class Initialized");}// --------------------------------------------------------------------/*** Send Trackback** @access public* @param array* @return bool*/function send($tb_data){if ( ! is_array($tb_data)){$this->set_error('The send() method must be passed an array');return FALSE;}// Pre-process the Trackback Dataforeach (array('url', 'title', 'excerpt', 'blog_name', 'ping_url') as $item){if ( ! isset($tb_data[$item])){$this->set_error('Required item missing: '.$item);return FALSE;}switch ($item){case 'ping_url' : $$item = $this->extract_urls($tb_data[$item]);break;case 'excerpt' : $$item = $this->limit_characters($this->convert_xml(strip_tags(stripslashes($tb_data[$item]))));break;case 'url' : $$item = str_replace('-', '-', $this->convert_xml(strip_tags(stripslashes($tb_data[$item]))));break;default : $$item = $this->convert_xml(strip_tags(stripslashes($tb_data[$item])));break;}// Convert High ASCII Charactersif ($this->convert_ascii == TRUE){if ($item == 'excerpt'){$$item = $this->convert_ascii($$item);}elseif ($item == 'title'){$$item = $this->convert_ascii($$item);}elseif($item == 'blog_name'){$$item = $this->convert_ascii($$item);}}}// Build the Trackback data string$charset = ( ! isset($tb_data['charset'])) ? $this->charset : $tb_data['charset'];$data = "url=".rawurlencode($url)."&title=".rawurlencode($title)."&blog_name=".rawurlencode($blog_name)."&excerpt=".rawurlencode($excerpt)."&charset=".rawurlencode($charset);// Send Trackback(s)$return = TRUE;if (count($ping_url) > 0){foreach ($ping_url as $url){if ($this->process($url, $data) == FALSE){$return = FALSE;}}}return $return;}// --------------------------------------------------------------------/*** Receive Trackback Data** This function simply validates the incoming TB data.* It returns false on failure and true on success.* If the data is valid it is set to the $this->data array* so that it can be inserted into a database.** @access public* @return bool*/function receive(){foreach (array('url', 'title', 'blog_name', 'excerpt') as $val){if ( ! isset($_POST[$val]) OR $_POST[$val] == ''){$this->set_error('The following required POST variable is missing: '.$val);return FALSE;}$this->data['charset'] = ( ! isset($_POST['charset'])) ? 'auto' : strtoupper(trim($_POST['charset']));if ($val != 'url' && function_exists('mb_convert_encoding')){$_POST[$val] = mb_convert_encoding($_POST[$val], $this->charset, $this->data['charset']);}$_POST[$val] = ($val != 'url') ? $this->convert_xml(strip_tags($_POST[$val])) : strip_tags($_POST[$val]);if ($val == 'excerpt'){$_POST['excerpt'] = $this->limit_characters($_POST['excerpt']);}$this->data[$val] = $_POST[$val];}return TRUE;}// --------------------------------------------------------------------/*** Send Trackback Error Message** Allows custom errors to be set. By default it* sends the "incomplete information" error, as that's* the most common one.** @access public* @param string* @return void*/function send_error($message = 'Incomplete Information'){echo "<?xml version=\"1.0\" encoding=\"utf-8\"?".">\n<response>\n<error>1</error>\n<message>".$message."</message>\n</response>";exit;}// --------------------------------------------------------------------/*** Send Trackback Success Message** This should be called when a trackback has been* successfully received and inserted.** @access public* @return void*/function send_success(){echo "<?xml version=\"1.0\" encoding=\"utf-8\"?".">\n<response>\n<error>0</error>\n</response>";exit;}// --------------------------------------------------------------------/*** Fetch a particular item** @access public* @param string* @return string*/function data($item){return ( ! isset($this->data[$item])) ? '' : $this->data[$item];}// --------------------------------------------------------------------/*** Process Trackback** Opens a socket connection and passes the data to* the server. Returns true on success, false on failure** @access public* @param string* @param string* @return bool*/function process($url, $data){$target = parse_url($url);// Open the socketif ( ! $fp = @fsockopen($target['host'], 80)){$this->set_error('Invalid Connection: '.$url);return FALSE;}// Build the path$ppath = ( ! isset($target['path'])) ? $url : $target['path'];$path = (isset($target['query']) && $target['query'] != "") ? $ppath.'?'.$target['query'] : $ppath;// Add the Trackback ID to the data stringif ($id = $this->get_id($url)){$data = "tb_id=".$id."&".$data;}// Transfer the datafputs ($fp, "POST " . $path . " HTTP/1.0\r\n" );fputs ($fp, "Host: " . $target['host'] . "\r\n" );fputs ($fp, "Content-type: application/x-www-form-urlencoded\r\n" );fputs ($fp, "Content-length: " . strlen($data) . "\r\n" );fputs ($fp, "Connection: close\r\n\r\n" );fputs ($fp, $data);// Was it successful?$this->response = "";while( ! feof($fp)){$this->response .= fgets($fp, 128);}@fclose($fp);if ( ! eregi("<error>0</error>", $this->response)){$message = 'An unknown error was encountered';if (preg_match("/<message>(.*?)<\/message>/is", $this->response, $match)){$message = trim($match['1']);}$this->set_error($message);return FALSE;}return TRUE;}// --------------------------------------------------------------------/*** Extract Trackback URLs** This function lets multiple trackbacks be sent.* It takes a string of URLs (separated by comma or* space) and puts each URL into an array** @access public* @param string* @return string*/function extract_urls($urls){// Remove the pesky white space and replace with a comma.$urls = preg_replace("/\s*(\S+)\s*/", "\\1,", $urls);// If they use commas get rid of the doubles.$urls = str_replace(",,", ",", $urls);// Remove any comma that might be at the endif (substr($urls, -1) == ","){$urls = substr($urls, 0, -1);}// Break into an array via commas$urls = preg_split('/[,]/', $urls);// Removes duplicates$urls = array_unique($urls);array_walk($urls, array($this, 'validate_url'));return $urls;}// --------------------------------------------------------------------/*** Validate URL** Simply adds "http://" if missing** @access public* @param string* @return string*/function validate_url($url){$url = trim($url);if (substr($url, 0, 4) != "http"){$url = "http://".$url;}}// --------------------------------------------------------------------/*** Find the Trackback URL's ID** @access public* @param string* @return string*/function get_id($url){$tb_id = "";if (strstr($url, '?')){$tb_array = explode('/', $url);$tb_end = $tb_array[count($tb_array)-1];if ( ! is_numeric($tb_end)){$tb_end = $tb_array[count($tb_array)-2];}$tb_array = explode('=', $tb_end);$tb_id = $tb_array[count($tb_array)-1];}else{if (ereg("/$", $url)){$url = substr($url, 0, -1);}$tb_array = explode('/', $url);$tb_id = $tb_array[count($tb_array)-1];if ( ! is_numeric($tb_id)){$tb_id = $tb_array[count($tb_array)-2];}}if ( ! preg_match ("/^([0-9]+)$/", $tb_id)){return false;}else{return $tb_id;}}// --------------------------------------------------------------------/*** Convert Reserved XML characters to Entities** @access public* @param string* @return string*/function convert_xml($str){$temp = '__TEMP_AMPERSANDS__';$str = preg_replace("/&#(\d+);/", "$temp\\1;", $str);$str = preg_replace("/&(\w+);/", "$temp\\1;", $str);$str = str_replace(array("&","<",">","\"", "'", "-"),array("&", "<", ">", """, "'", "-"),$str);$str = preg_replace("/$temp(\d+);/","&#\\1;",$str);$str = preg_replace("/$temp(\w+);/","&\\1;", $str);return $str;}// --------------------------------------------------------------------/*** Character limiter** Limits the string based on the character count. Will preserve complete words.** @access public* @param string* @param integer* @param string* @return string*/function limit_characters($str, $n = 500, $end_char = '…'){if (strlen($str) < $n){return $str;}$str = preg_replace("/\s+/", ' ', str_replace(array("\r\n", "\r", "\n"), ' ', $str));if (strlen($str) <= $n){return $str;}$out = "";foreach (explode(' ', trim($str)) as $val){$out .= $val.' ';if (strlen($out) >= $n){return trim($out).$end_char;}}}// --------------------------------------------------------------------/*** High ASCII to Entities** Converts Hight ascii text and MS Word special chars* to character entities** @access public* @param string* @return string*/function convert_ascii($str){$count = 1;$out = '';$temp = array();for ($i = 0, $s = strlen($str); $i < $s; $i++){$ordinal = ord($str[$i]);if ($ordinal < 128){$out .= $str[$i];}else{if (count($temp) == 0){$count = ($ordinal < 224) ? 2 : 3;}$temp[] = $ordinal;if (count($temp) == $count){$number = ($count == 3) ? (($temp['0'] % 16) * 4096) + (($temp['1'] % 64) * 64) + ($temp['2'] % 64) : (($temp['0'] % 32) * 64) + ($temp['1'] % 64);$out .= '&#'.$number.';';$count = 1;$temp = array();}}}return $out;}// --------------------------------------------------------------------/*** Set error message** @access public* @param string* @return void*/function set_error($msg){log_message('error', $msg);$this->error_msg[] = $msg;}// --------------------------------------------------------------------/*** Show error messages** @access public* @param string* @param string* @return string*/function display_errors($open = '<p>', $close = '</p>'){$str = '';foreach ($this->error_msg as $val){$str .= $open.$val.$close;}return $str;}}// END Trackback Class/* End of file Trackback.php *//* Location: ./system/libraries/Trackback.php */