WebSVN – lars-tiefland.ci – /system/libraries/Trackback.php

<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2018, British Columbia Institute of Technology
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @package     CodeIgniter
 * @author      EllisLab Dev Team
 * @copyright   Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
 * @copyright   Copyright (c) 2014 - 2018, British Columbia Institute of Technology (http://bcit.ca/)
 * @license     http://opensource.org/licenses/MIT      MIT License
 * @link        https://codeigniter.com
 * @since       Version 1.0.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * Trackback Class
 *
 * Trackback Sending/Receiving Class
 *
 * @package             CodeIgniter
 * @subpackage  Libraries
 * @category    Trackbacks
 * @author              EllisLab Dev Team
 * @link                https://codeigniter.com/user_guide/libraries/trackback.html
 */
class CI_Trackback {

        /**
         * Character set
         *
         * @var string
         */
        public $charset = 'UTF-8';

        /**
         * Trackback data
         *
         * @var array
         */
        public $data = array(
                'url' => '',
                'title' => '',
                'excerpt' => '',
                'blog_name' => '',
                'charset' => ''
        );

        /**
         * Convert ASCII flag
         *
         * Whether to convert high-ASCII and MS Word
         * characters to HTML entities.
         *
         * @var bool
         */
        public $convert_ascii = TRUE;

        /**
         * Response
         *
         * @var string
         */
        public $response = '';

        /**
         * Error messages list
         *
         * @var string[]
         */
        public $error_msg = array();

        // --------------------------------------------------------------------

        /**
         * Constructor
         *
         * @return      void
         */
        public function __construct()
        {
                log_message('info', 'Trackback Class Initialized');
        }

        // --------------------------------------------------------------------

        /**
         * Send Trackback
         *
         * @param       array
         * @return      bool
         */
        public 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 ($this->convert_ascii === TRUE && in_array($item, array('excerpt', 'title', 'blog_name'), TRUE))
                        {
                                $$item = $this->convert_ascii($$item);
                        }
                }

                // Build the Trackback data string
                $charset = isset($tb_data['charset']) ? $tb_data['charset'] : $this->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.
         *
         * @return      bool
         */
        public function receive()
        {
                foreach (array('url', 'title', 'blog_name', 'excerpt') as $val)
                {
                        if (empty($_POST[$val]))
                        {
                                $this->set_error('The following required POST variable is missing: '.$val);
                                return FALSE;
                        }

                        $this->data['charset'] = isset($_POST['charset']) ? strtoupper(trim($_POST['charset'])) : 'auto';

                        if ($val !== 'url' && MB_ENABLED === TRUE)
                        {
                                if (MB_ENABLED === TRUE)
                                {
                                        $_POST[$val] = mb_convert_encoding($_POST[$val], $this->charset, $this->data['charset']);
                                }
                                elseif (ICONV_ENABLED === TRUE)
                                {
                                        $_POST[$val] = @iconv($this->data['charset'], $this->charset.'//IGNORE', $_POST[$val]);
                                }
                        }

                        $_POST[$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.
         *
         * @param       string
         * @return      void
         */
        public function send_error($message = 'Incomplete Information')
        {
                exit('<?xml version="1.0" encoding="utf-8"?'.">\n<response>\n<error>1</error>\n<message>".$message."</message>\n</response>");
        }

        // --------------------------------------------------------------------

        /**
         * Send Trackback Success Message
         *
         * This should be called when a trackback has been
         * successfully received and inserted.
         *
         * @return      void
         */
        public function send_success()
        {
                exit('<?xml version="1.0" encoding="utf-8"?'.">\n<response>\n<error>0</error>\n</response>");
        }

        // --------------------------------------------------------------------

        /**
         * Fetch a particular item
         *
         * @param       string
         * @return      string
         */
        public 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
         *
         * @param       string
         * @param       string
         * @return      bool
         */
        public 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
                $path = isset($target['path']) ? $target['path'] : $url;
                empty($target['query']) OR $path .= '?'.$target['query'];

                // 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 (stripos($this->response, '<error>0</error>') === FALSE)
                {
                        $message = preg_match('/<message>(.*?)<\/message>/is', $this->response, $match)
                                ? trim($match[1])
                                : 'An unknown error was encountered';
                        $this->set_error($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
         *
         * @param       string
         * @return      string
         */
        public function extract_urls($urls)
        {
                // Remove the pesky white space and replace with a comma, then replace doubles.
                $urls = str_replace(',,', ',', preg_replace('/\s*(\S+)\s*/', '\\1,', $urls));

                // Break into an array via commas and remove duplicates
                $urls = array_unique(preg_split('/[,]/', rtrim($urls, ',')));

                array_walk($urls, array($this, 'validate_url'));
                return $urls;
        }

        // --------------------------------------------------------------------

        /**
         * Validate URL
         *
         * Simply adds "http://" if missing
         *
         * @param       string
         * @return      void
         */
        public function validate_url(&$url)
        {
                $url = trim($url);

                if (stripos($url, 'http') !== 0)
                {
                        $url = 'http://'.$url;
                }
        }

        // --------------------------------------------------------------------

        /**
         * Find the Trackback URL's ID
         *
         * @param       string
         * @return      string
         */
        public 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];
                        }
                }

                return ctype_digit((string) $tb_id) ? $tb_id : FALSE;
        }

        // --------------------------------------------------------------------

        /**
         * Convert Reserved XML characters to Entities
         *
         * @param       string
         * @return      string
         */
        public function convert_xml($str)
        {
                $temp = '__TEMP_AMPERSANDS__';

                $str = preg_replace(array('/&#(\d+);/', '/&(\w+);/'), $temp.'\\1;', $str);

                $str = str_replace(array('&', '<', '>', '"', "'", '-'),
                                        array('&amp;', '&lt;', '&gt;', '&quot;', '&#39;', '&#45;'),
                                        $str);

                return preg_replace(array('/'.$temp.'(\d+);/', '/'.$temp.'(\w+);/'), array('&#\\1;', '&\\1;'), $str);
        }

        // --------------------------------------------------------------------

        /**
         * Character limiter
         *
         * Limits the string based on the character count. Will preserve complete words.
         *
         * @param       string
         * @param       int
         * @param       string
         * @return      string
         */
        public function limit_characters($str, $n = 500, $end_char = '&#8230;')
        {
                if (strlen($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) >= $n)
                        {
                                return rtrim($out).$end_char;
                        }
                }
        }

        // --------------------------------------------------------------------

        /**
         * High ASCII to Entities
         *
         * Converts Hight ascii text and MS Word special chars
         * to character entities
         *
         * @param       string
         * @return      string
         */
        public 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
         *
         * @param       string
         * @return      void
         */
        public function set_error($msg)
        {
                log_message('error', $msg);
                $this->error_msg[] = $msg;
        }

        // --------------------------------------------------------------------

        /**
         * Show error messages
         *
         * @param       string
         * @param       string
         * @return      string
         */
        public function display_errors($open = '<p>', $close = '</p>')
        {
                return (count($this->error_msg) > 0) ? $open.implode($close.$open, $this->error_msg).$close : '';
        }

}
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(root)/system/libraries/Trackback.php – Revision 2365
