Viewing file: Trackback.php (11.71 KB) -rwxr-xr-x Select action/file-type: (+) | (+) | (+) | Code (+) | Session (+) | (+) | SDB (+) | (+) | (+) | (+) | (+) | (+) |
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); /** * CodeIgniter * * An open source application development framework for PHP 5.1.6 or newer * * @package CodeIgniter * @author ExpressionEngine Dev Team * @copyright Copyright (c) 2008 - 2011, 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 $error_msg = array();
/** * Constructor * * @access public */ public function __construct() { log_message('debug', "Trackback Class Initialized"); }
// --------------------------------------------------------------------
/** * Send Trackback * * @access public * @param array * @return bool */ function send($tb_data) { if ( ! is_array($tb_data)) { $this->set_error('The send() method must be passed an array'); return FALSE; }
// Pre-process the Trackback Data foreach (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[$item]))); break; }
// Convert High ASCII Characters if ($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 socket if ( ! $fp = @fsockopen($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'] : $ppath;
// Add the Trackback ID to the data string if ($id = $this->get_id($url)) { $data = "tb_id=".$id."&".$data; }
// Transfer the data fputs ($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($fp);
if (stristr($this->response, '<error>0</error>') === FALSE) { $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(",,", ",", $urls);
// Remove any comma that might be at the end if (substr($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) { $tb_id = "";
if (strpos($url, '?') !== FALSE) { $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 { $url = rtrim($url, '/');
$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 */
|