Initial Import

1 files changed, 561 insertions, 0 deletions

diff --git a/system/libraries/Trackback.php b/system/libraries/Trackback.php
new file mode 100644
index 000000000..583c6d28d
--- /dev/null
+++ b/system/libraries/Trackback.php
@@ -0,0 +1,561 @@
+<?php  if (!defined('BASEPATH')) exit('No direct script access allowed');
+/**
+ * Code Igniter
+ *
+ * An open source application development framework for PHP 4.3.2 or newer
+ *
+ * @package		CodeIgniter
+ * @author		Rick Ellis
+ * @copyright	Copyright (c) 2006, pMachine, Inc.
+ * @license		http://www.codeignitor.com/user_guide/license.html 
+ * @link		http://www.codeigniter.com
+ * @since		Version 1.0
+ * @filesource
+ */
+ 
+// ------------------------------------------------------------------------
+
+/**
+ * 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'	 	: $$item = str_replace('&#45;', '-', $this->convert_xml(strip_tags(stripslashes($tb_data[$item]))));
+					break;
+				default			: $$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($message = 'Incomplete Information')
+	{
+		echo "<?xml version=\"1.0\" encoding=\"utf-8\"?".">\n<response>\n<error>1</error>\n<message>".$message."</message>\n</response>";
+		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 "<?xml version=\"1.0\" encoding=\"utf-8\"?".">\n<response>\n<error>0</error>\n</response>";
+		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("<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;
+	}
+	// 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 ( ! ctype_digit($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 ( ! ctype_digit($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("&amp;", "&lt;", "&gt;", "&quot;", "&#39;", "&#45;"),
+						   $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, $end_char = '&#8230;')
+	{
+		if (strlen($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 = '<p>', $close = '</p>')
+	{	
+		$str = '';
+		foreach ($this->error_msg as $val)
+		{
+			$str .= $open.$val.$close;
+		}
+	
+		return $str;
+	}
+	// END display_errors()
+}
+// END Trackback Class
+?>
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