trackback =& new CI_Trackback(); // ------------------------------------------------------------------------ /** * Trackback Class * * Trackback Sending/Receiving Class * * @package CodeIgniter * @subpackage Libraries * @category Trackbacks * @author Paul Burdick * @link http://www.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 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; } // END send() // -------------------------------------------------------------------- /** * 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; } // END receive() // -------------------------------------------------------------------- /** * Send Trackback Error Message * * Allows custom errros 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($message = 'Incomplete Information') { echo "\n\n1\n".$message."\n"; exit; } // END send_error() // -------------------------------------------------------------------- /** * 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 "\n\n0\n"; exit; } // END send_success() // -------------------------------------------------------------------- /** * Fetch a particular item * * @access public * @param string * @return string */ function data($item) { return ( ! isset($this->data[$item])) ? '' : $this->data[$item]; } // END data() // -------------------------------------------------------------------- /** * 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 ( ! eregi("0", $this->response)) { $message = 'An unknown error was encountered'; if (preg_match("/(.*?)<\/message>/is", $this->response, $match)) { $message = trim($match['1']); } $this->set_error($message); return FALSE; } return TRUE; } // END process() // -------------------------------------------------------------------- /** * 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 $urls; } // END extract_urls() // -------------------------------------------------------------------- /** * Validate URL * * Simply adds "http://" if missing * * @access public * @param string * @return string */ function validate_url($url) { $url = trim($url); if (substr($url, 0, 4) != "http") { $url = "http://".$url; } } // END validate_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 $tb_id; } } // END get_id() // -------------------------------------------------------------------- /** * Convert Reserved XML characters to Entities * * @access public * @param string * @return string */ function convert_xml($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 $str; } // END get_id() // -------------------------------------------------------------------- /** * Character limiter * * Limits the string based on the character count. Will preserve complete words. * * @access public * @param string * @param integer * @param string * @return string */ function limit_characters($str, $n = 500, $end_char = '…') { if (strlen($str) < $n) { return $str; } $str = preg_replace("/\s+/", ' ', preg_replace("/(\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).$end_char; } } } // END get_id() // -------------------------------------------------------------------- /** * High ASCII to Entities * * Converts Hight ascii text and MS Word special chars * to character entities * * @access public * @param string * @return string */ function convert_ascii($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 $out; } // END convert_ascii() // -------------------------------------------------------------------- /** * Set error message * * @access public * @param string * @return void */ function set_error($msg) { log_message('error', $msg); $this->error_msg[] = $msg; } // END convert_ascii() // -------------------------------------------------------------------- /** * Show error messages * * @access public * @param string * @param string * @return string */ function display_errors($open = '

', $close = '

') { $str = ''; foreach ($this->error_msg as $val) { $str .= $open.$val.$close; } return $str; } // END display_errors() } // END Trackback Class ?>